Reworked sclp driver part 2.
diff -urN linux-2.5.48/drivers/s390/char/sclp.c linux-2.5.48-s390/drivers/s390/char/sclp.c
--- linux-2.5.48/drivers/s390/char/sclp.c Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp.c Mon Nov 18 20:14:52 2002
@@ -0,0 +1,663 @@
+/*
+ * drivers/s390/char/sclp.c
+ * core function to access sclp interface
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/kmod.h>
+#include <linux/bootmem.h>
+#include <linux/err.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <asm/s390_ext.h>
+
+#include "sclp.h"
+
+#define SCLP_CORE_PRINT_HEADER "sclp low level driver: "
+
+/*
+ * decides wether we make use of the macro MACHINE_IS_VM to
+ * configure the driver for VM at run time (a little bit
+ * different behaviour); otherwise we use the default
+ * settings in sclp_data.init_ioctls
+ */
+#define USE_VM_DETECTION
+
+/* Structure for register_early_external_interrupt. */
+static ext_int_info_t ext_int_info_hwc;
+
+/* spinlock to protect global variables of sclp_core */
+static spinlock_t sclp_lock;
+
+/* Mask of valid sclp events */
+static sccb_mask_t sclp_receive_mask;
+static sccb_mask_t sclp_send_mask;
+
+/* List of registered event types */
+static struct list_head sclp_reg_list;
+
+/* sccb queue */
+struct list_head sclp_req_queue;
+
+/* sccb for unconditional read */
+static struct sclp_req sclp_read_req;
+static char sclp_read_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
+/* sccb for write mask sccb */
+static char sclp_init_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
+
+static unsigned long sclp_status = 0;
+/* some status flags */
+#define SCLP_INIT 0
+#define SCLP_RUNNING 1
+#define SCLP_READING 2
+
+/*
+ * assembler instruction for Service Call
+ */
+static int
+__service_call(sclp_cmdw_t command, void *sccb)
+{
+ int cc;
+
+ /*
+ * Mnemonic: SERVC Rx, Ry [RRE]
+ *
+ * Rx: SCLP command word
+ * Ry: address of SCCB
+ */
+ __asm__ __volatile__(
+ " .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
+ " ipm %0\n"
+ " srl %0,28"
+ : "=&d" (cc)
+ : "d" (command), "a" (__pa(sccb))
+ : "cc", "memory" );
+ /*
+ * cc == 0: Service Call succesful initiated
+ * cc == 2: SCLP busy, new Service Call not initiated,
+ * new SCCB unchanged
+ * cc == 3: SCLP function not operational
+ */
+ if (cc == 3)
+ return -EIO;
+ /*
+ * We set the SCLP_RUNNING bit for cc 2 as well because if
+ * service_call returns cc 2 some old request is running
+ * that has to complete first
+ */
+ set_bit(SCLP_RUNNING, &sclp_status);
+ if (cc == 2)
+ return -EBUSY;
+ return 0;
+}
+
+static int
+__sclp_start_request(void)
+{
+ struct sclp_req *req;
+ int rc;
+
+ /* quick exit if sclp is already in use */
+ if (test_bit(SCLP_RUNNING, &sclp_status))
+ return -EBUSY;
+ /* quick exit if queue is empty */
+ if (list_empty(&sclp_req_queue))
+ return -EINVAL;
+ /* try to start the first request on the request queue. */
+ req = list_entry(sclp_req_queue.next, struct sclp_req, list);
+ rc = __service_call(req->command, req->sccb);
+ switch (rc) {
+ case 0:
+ req->status = SCLP_REQ_RUNNING;
+ break;
+ case -EIO:
+ req->status = SCLP_REQ_FAILED;
+ if (req->callback != NULL)
+ req->callback(req, req->callback_data);
+ break;
+ }
+ return rc;
+}
+
+static int
+sclp_process_evbufs(struct sccb_header *sccb)
+{
+ unsigned long flags;
+ struct evbuf_header *evbuf;
+ struct list_head *l;
+ struct sclp_register *t;
+
+ spin_lock_irqsave(&sclp_lock, flags);
+ evbuf = (struct evbuf_header *) (sccb + 1);
+ while ((void *) evbuf < (void *) sccb + sccb->length) {
+ /* check registered event */
+ list_for_each(l, &sclp_reg_list) {
+ t = list_entry(l, struct sclp_register, list);
+ if (t->receive_mask & (1 << (32 - evbuf->type))) {
+ if (t->receiver_fn != NULL)
+ t->receiver_fn(evbuf);
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ return -ENOSYS;
+}
+
+/*
+ * postprocessing of unconditional read service call
+ */
+static void
+sclp_unconditional_read_cb(struct sclp_req *read_req, void *data)
+{
+ static struct {
+ u16 code; char *msg;
+ } errors[] = {
+ { 0x0040, "SCLP equipment check" },
+ { 0x0100, "SCCB boundary violation" },
+ { 0x01f0, "invalid command" },
+ { 0x0300, "insufficient SCCB length" },
+ { 0x40f0, "invalid function code" },
+ { 0x60f0, "got interrupt but no data found" },
+ { 0x62f0, "got interrupt but no data found" },
+ { 0x70f0, "invalid selection mask" }
+ };
+ struct sccb_header *sccb;
+ char *errmsg;
+ int i;
+
+ sccb = read_req->sccb;
+ if (sccb->response_code == 0x0020 ||
+ sccb->response_code == 0x0220) {
+ /* normal read completion, event buffers stored in sccb */
+ if (sclp_process_evbufs(sccb) == 0) {
+ clear_bit(SCLP_READING, &sclp_status);
+ return;
+ }
+ errmsg = "invalid response code";
+ } else {
+ errmsg = NULL;
+ for (i = 0; i < sizeof(errors)/sizeof(errors[0]); i++)
+ if (sccb->response_code == errors[i].code) {
+ errmsg = errors[i].msg;
+ break;
+ }
+ if (errmsg == NULL)
+ errmsg = "invalid response code";
+ }
+ printk(KERN_WARNING SCLP_CORE_PRINT_HEADER
+ "unconditional read: %s (response code =0x%x).\n",
+ errmsg, sccb->response_code);
+ clear_bit(SCLP_READING, &sclp_status);
+}
+
+/*
+ * Function to issue Read Event Data/Unconditional Read
+ */
+static void
+__sclp_unconditional_read(void)
+{
+ struct sccb_header *sccb;
+ struct sclp_req *read_req;
+
+ /*
+ * Donīt try to initiate Unconditional Read if we are not able to
+ * receive anything
+ */
+ if (sclp_receive_mask == 0)
+ return;
+ /* Don't try reading if a read is already outstanding */
+ if (test_and_set_bit(SCLP_READING, &sclp_status))
+ return;
+ /* Initialise read sccb */
+ sccb = (struct sccb_header *) sclp_read_sccb;
+ clear_page(sccb);
+ sccb->length = PAGE_SIZE;
+ sccb->function_code = 0; /* unconditional read */
+ sccb->control_mask[2] = 0x80; /* variable length response */
+ /* stick the request structure to the end of the page */
+ read_req = &sclp_read_req;
+ read_req->command = SCLP_CMDW_READDATA;
+ read_req->status = SCLP_REQ_QUEUED;
+ read_req->callback = sclp_unconditional_read_cb;
+ read_req->sccb = sccb;
+ /* Add read request to the head of queue */
+ list_add(&read_req->list, &sclp_req_queue);
+}
+
+/*
+ * Handler for service-signal external interruptions
+ */
+static void
+sclp_interrupt_handler(struct pt_regs *regs, __u16 code)
+{
+ u32 ext_int_param, finished_sccb, evbuf_pending;
+ struct list_head *l;
+ struct sclp_req *req, *tmp;
+ int cpu;
+
+ cpu = smp_processor_id();
+ ext_int_param = S390_lowcore.ext_params;
+ finished_sccb = ext_int_param & -8U;
+ evbuf_pending = ext_int_param & 1;
+ irq_enter();
+ /*
+ * Only do request callsbacks if sclp is initialised.
+ * This avoids strange effects for a pending request
+ * from before the last re-ipl.
+ */
+ if (test_bit(SCLP_INIT, &sclp_status)) {
+ spin_lock(&sclp_lock);
+ req = NULL;
+ if (finished_sccb != 0U) {
+ list_for_each(l, &sclp_req_queue) {
+ tmp = list_entry(l, struct sclp_req, list);
+ if (finished_sccb == (u32)(addr_t) tmp->sccb) {
+ list_del(&tmp->list);
+ req = tmp;
+ break;
+ }
+ }
+ }
+ spin_unlock(&sclp_lock);
+ if (req != NULL) {
+ req->status = SCLP_REQ_DONE;
+ if (req->callback != NULL)
+ req->callback(req, req->callback_data);
+ }
+ }
+ spin_lock(&sclp_lock);
+ /* Head queue a read sccb if an event buffer is pending */
+ if (evbuf_pending)
+ __sclp_unconditional_read();
+ /* Now clear the running bit */
+ clear_bit(SCLP_RUNNING, &sclp_status);
+ /* and start next request on the queue */
+ __sclp_start_request();
+ spin_unlock(&sclp_lock);
+ irq_exit();
+}
+
+/*
+ * Wait synchronously for external interrupt of sclp. We may not receive
+ * any other external interrupt, so we disable all other external interrupts
+ * in control register 0.
+ */
+void
+sclp_sync_wait(void)
+{
+ unsigned long psw_mask;
+ unsigned long cr0, cr0_sync;
+
+ /*
+ * save cr0
+ * enable service signal external interruption (cr0.22)
+ * disable cr0.20-21, cr0.25, cr0.27, cr0.30-31
+ * don't touch any other bit in cr0
+ */
+ __ctl_store(cr0, 0, 0);
+ cr0_sync = cr0;
+ cr0_sync |= 0x00000200;
+ cr0_sync &= 0xFFFFF3AC;
+ __ctl_load(cr0_sync, 0, 0);
+
+ /* enable external interruptions (PSW-mask.7) */
+ asm volatile ("STOSM 0(%1),0x01"
+ : "=m" (psw_mask) : "a" (&psw_mask) : "memory");
+
+ /* wait until ISR signals receipt of interrupt */
+ while (test_bit(SCLP_RUNNING, &sclp_status))
+ barrier();
+
+ /* disable external interruptions */
+ asm volatile ("SSM 0(%0)"
+ : : "a" (&psw_mask) : "memory");
+
+ /* restore cr0 */
+ __ctl_load(cr0, 0, 0);
+}
+
+/*
+ * Queue a request to the tail of the ccw_queue. Start the I/O if
+ * possible.
+ */
+void
+sclp_add_request(struct sclp_req *req)
+{
+ unsigned long flags;
+
+ if (!test_bit(SCLP_INIT, &sclp_status))
+ return;
+ spin_lock_irqsave(&sclp_lock, flags);
+ /* queue the request */
+ req->status = SCLP_REQ_QUEUED;
+ list_add_tail(&req->list, &sclp_req_queue);
+ /* try to start the first request on the queue */
+ __sclp_start_request();
+ spin_unlock_irqrestore(&sclp_lock, flags);
+}
+
+/* state change notification */
+struct sclp_statechangebuf {
+ struct evbuf_header header;
+ u8 validity_sclp_active_facility_mask : 1;
+ u8 validity_sclp_receive_mask : 1;
+ u8 validity_sclp_send_mask : 1;
+ u8 validity_read_data_function_mask : 1;
+ u16 _zeros : 12;
+ u16 mask_length;
+ u64 sclp_active_facility_mask;
+ sccb_mask_t sclp_receive_mask;
+ sccb_mask_t sclp_send_mask;
+ u32 read_data_function_mask;
+} __attribute__((packed));
+
+static inline void
+__sclp_notify_state_change(void)
+{
+ struct list_head *l;
+ struct sclp_register *t;
+ sccb_mask_t receive_mask, send_mask;
+
+ list_for_each(l, &sclp_reg_list) {
+ t = list_entry(l, struct sclp_register, list);
+ receive_mask = t->receive_mask & sclp_receive_mask;
+ send_mask = t->send_mask & sclp_send_mask;
+ if (t->sclp_receive_mask != receive_mask ||
+ t->sclp_send_mask != send_mask) {
+ t->sclp_receive_mask = receive_mask;
+ t->sclp_send_mask = send_mask;
+ if (t->state_change_fn != NULL)
+ t->state_change_fn(t);
+ }
+ }
+}
+
+static void
+sclp_state_change(struct evbuf_header *evbuf)
+{
+ unsigned long flags;
+ struct sclp_statechangebuf *scbuf;
+
+ spin_lock_irqsave(&sclp_lock, flags);
+ scbuf = (struct sclp_statechangebuf *) evbuf;
+
+ if (scbuf->validity_sclp_receive_mask) {
+ if (scbuf->mask_length != 4)
+ printk(KERN_WARNING SCLP_CORE_PRINT_HEADER
+ "state change event with mask length %i\n",
+ scbuf->mask_length);
+ else
+ /* set new send mask */
+ sclp_receive_mask = scbuf->sclp_receive_mask;
+ }
+
+ if (scbuf->validity_sclp_send_mask) {
+ if (scbuf->mask_length != 4)
+ printk(KERN_WARNING SCLP_CORE_PRINT_HEADER
+ "state change event with mask length %i\n",
+ scbuf->mask_length);
+ else
+ /* set new send mask */
+ sclp_send_mask = scbuf->sclp_send_mask;
+ }
+
+ __sclp_notify_state_change();
+ spin_unlock_irqrestore(&sclp_lock, flags);
+}
+
+struct sclp_register sclp_state_change_event = {
+ .receive_mask = EvTyp_StateChange_Mask,
+ .receiver_fn = sclp_state_change
+};
+
+
+/*
+ * SCLP quiesce event handler
+ */
+#ifdef CONFIG_SMP
+static volatile unsigned long cpu_quiesce_map;
+
+static void
+do_load_quiesce_psw(void * __unused)
+{
+ psw_t quiesce_psw;
+
+ clear_bit(smp_processor_id(), &cpu_quiesce_map);
+ if (smp_processor_id() == 0) {
+ /* Wait for all other cpus to enter do_load_quiesce_psw */
+ while (cpu_quiesce_map != 0);
+ /* Quiesce the last cpu with the special psw */
+ quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
+ quiesce_psw.addr = 0xfff;
+ __load_psw(quiesce_psw);
+ }
+ signal_processor(smp_processor_id(), sigp_stop);
+}
+
+static void
+do_machine_quiesce(void)
+{
+ cpu_quiesce_map = cpu_online_map;
+ smp_call_function(do_load_quiesce_psw, NULL, 0, 0);
+ do_load_quiesce_psw(NULL);
+}
+#else
+static void
+do_machine_quiesce(void)
+{
+ psw_t quiesce_psw;
+
+ quiesce_psw.mask = _DW_PSW_MASK;
+ queisce_psw.addr = 0xfff;
+ __load_psw(quiesce_psw);
+}
+#endif
+
+extern void ctrl_alt_del(void);
+
+static void
+sclp_quiesce(struct evbuf_header *evbuf)
+{
+ /*
+ * We got a "shutdown" request.
+ * Add a call to an appropriate "shutdown" routine here. This
+ * routine should set all PSWs to 'disabled-wait', 'stopped'
+ * or 'check-stopped' - except 1 PSW which needs to carry a
+ * special bit pattern called 'quiesce PSW'.
+ */
+ _machine_restart = (void *) do_machine_quiesce;
+ _machine_halt = do_machine_quiesce;
+ _machine_power_off = do_machine_quiesce;
+ ctrl_alt_del();
+}
+
+struct sclp_register sclp_quiesce_event = {
+ .receive_mask = EvTyp_SigQuiesce_Mask,
+ .receiver_fn = sclp_quiesce
+};
+
+/* initialisation of SCLP */
+struct init_sccb {
+ struct sccb_header header;
+ u16 _reserved;
+ u16 mask_length;
+ sccb_mask_t receive_mask;
+ sccb_mask_t send_mask;
+ sccb_mask_t sclp_send_mask;
+ sccb_mask_t sclp_receive_mask;
+} __attribute__((packed));
+
+static int
+sclp_init_mask(void)
+{
+ unsigned long flags;
+ struct init_sccb *sccb;
+ struct sclp_req *req;
+ struct list_head *l;
+ struct sclp_register *t;
+ int rc;
+
+ sccb = (struct init_sccb *) sclp_init_sccb;
+ /* stick the request structure to the end of the init sccb page */
+ req = (struct sclp_req *) ((addr_t) sccb + PAGE_SIZE) - 1;
+
+ /* SCLP setup concerning receiving and sending Event Buffers */
+ req->command = SCLP_CMDW_WRITEMASK;
+ req->status = SCLP_REQ_QUEUED;
+ req->callback = NULL;
+ req->sccb = sccb;
+ /* setup sccb for writemask command */
+ memset(sccb, 0, sizeof(struct init_sccb));
+ sccb->header.length = sizeof(struct init_sccb);
+ sccb->mask_length = sizeof(sccb_mask_t);
+ /* copy in the sccb mask of the registered event types */
+ spin_lock_irqsave(&sclp_lock, flags);
+ list_for_each(l, &sclp_reg_list) {
+ t = list_entry(l, struct sclp_register, list);
+ sccb->receive_mask |= t->receive_mask;
+ sccb->send_mask |= t->send_mask;
+ }
+ sccb->sclp_receive_mask = 0;
+ sccb->sclp_send_mask = 0;
+ if (test_bit(SCLP_INIT, &sclp_status)) {
+ /* add request to sclp queue */
+ list_add_tail(&req->list, &sclp_req_queue);
+ /* and start if SCLP is idle */
+ if (!test_bit(SCLP_RUNNING, &sclp_status))
+ __sclp_start_request();
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ /* now wait for completion */
+ while (req->status != SCLP_REQ_DONE &&
+ req->status != SCLP_REQ_FAILED)
+ sclp_sync_wait();
+ spin_lock_irqsave(&sclp_lock, flags);
+ } else {
+ /*
+ * Special case for the very first write mask command.
+ * The interrupt handler is not removing request from
+ * the request queue and doesn't call callbacks yet
+ * because there might be an pending old interrupt
+ * after a Re-IPL. We have to receive and ignore it.
+ */
+ do {
+ rc = __service_call(req->command, req->sccb);
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ if (rc == -EIO)
+ return -ENOSYS;
+ sclp_sync_wait();
+ spin_lock_irqsave(&sclp_lock, flags);
+ } while (rc == -EBUSY);
+ }
+ sclp_receive_mask = sccb->sclp_receive_mask;
+ sclp_send_mask = sccb->sclp_send_mask;
+ __sclp_notify_state_change();
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ return 0;
+}
+
+/*
+ * sclp setup function. Called early (no kmalloc!) from sclp_console_init().
+ */
+static int
+sclp_init(void)
+{
+ int rc;
+
+ if (test_bit(SCLP_INIT, &sclp_status))
+ /* Already initialised. */
+ return 0;
+
+ /*
+ * request the 0x2401 external interrupt
+ * The sclp driver is initialized early (before kmalloc works). We
+ * need to use register_early_external_interrupt.
+ */
+ if (register_early_external_interrupt(0x2401, sclp_interrupt_handler,
+ &ext_int_info_hwc) != 0)
+ return -EBUSY;
+
+ spin_lock_init(&sclp_lock);
+ INIT_LIST_HEAD(&sclp_req_queue);
+
+ /* init event list */
+ INIT_LIST_HEAD(&sclp_reg_list);
+ list_add(&sclp_state_change_event.list, &sclp_reg_list);
+ list_add(&sclp_quiesce_event.list, &sclp_reg_list);
+
+ /* enable service-signal external interruptions,
+ * Control Register 0 bit 22 := 1
+ * (besides PSW bit 7 must be set to 1 sometimes for external
+ * interruptions)
+ */
+ ctl_set_bit(0, 9);
+
+ /* do the initial write event mask */
+ rc = sclp_init_mask();
+ if (rc == 0) {
+ /* Ok, now everything is setup right. */
+ set_bit(SCLP_INIT, &sclp_status);
+ return 0;
+ }
+
+ /* The sclp_init_mask failed. SCLP is broken, unregister and exit. */
+ ctl_clear_bit(0,9);
+ unregister_early_external_interrupt(0x2401, sclp_interrupt_handler,
+ &ext_int_info_hwc);
+
+ return rc;
+}
+
+int
+sclp_register(struct sclp_register *reg)
+{
+ unsigned long flags;
+ struct list_head *l;
+ struct sclp_register *t;
+
+ if (!MACHINE_HAS_SCLP)
+ return -ENODEV;
+
+ if (!test_bit(SCLP_INIT, &sclp_status))
+ sclp_init();
+ spin_lock_irqsave(&sclp_lock, flags);
+ /* check already registered event masks for collisions */
+ list_for_each(l, &sclp_reg_list) {
+ t = list_entry(l, struct sclp_register, list);
+ if (t->receive_mask & reg->receive_mask ||
+ t->send_mask & reg->send_mask) {
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ return -EBUSY;
+ }
+ }
+ /*
+ * set present mask to 0 to trigger state change
+ * callback in sclp_init_mask
+ */
+ reg->sclp_receive_mask = 0;
+ reg->sclp_send_mask = 0;
+ list_add(®->list, &sclp_reg_list);
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ sclp_init_mask();
+ return 0;
+}
+
+void
+sclp_unregister(struct sclp_register *reg)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sclp_lock, flags);
+ list_del(®->list);
+ spin_unlock_irqrestore(&sclp_lock, flags);
+ sclp_init_mask();
+}
+
diff -urN linux-2.5.48/drivers/s390/char/sclp.h linux-2.5.48-s390/drivers/s390/char/sclp.h
--- linux-2.5.48/drivers/s390/char/sclp.h Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp.h Mon Nov 18 20:14:52 2002
@@ -0,0 +1,157 @@
+/*
+ * drivers/s390/char/sclp.h
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef __SCLP_H__
+#define __SCLP_H__
+
+#include <linux/types.h>
+#include <linux/list.h>
+
+#include <asm/ebcdic.h>
+
+/* maximum number of pages concerning our own memory management */
+#define MAX_KMEM_PAGES (sizeof(unsigned long) << 3)
+#define MAX_CONSOLE_PAGES 4
+
+#define EvTyp_OpCmd 0x01
+#define EvTyp_Msg 0x02
+#define EvTyp_StateChange 0x08
+#define EvTyp_PMsgCmd 0x09
+#define EvTyp_CntlProgOpCmd 0x20
+#define EvTyp_CntlProgIdent 0x0B
+#define EvTyp_SigQuiesce 0x1D
+
+#define EvTyp_OpCmd_Mask 0x80000000
+#define EvTyp_Msg_Mask 0x40000000
+#define EvTyp_StateChange_Mask 0x01000000
+#define EvTyp_PMsgCmd_Mask 0x00800000
+#define EvTyp_CtlProgOpCmd_Mask 0x00000001
+#define EvTyp_CtlProgIdent_Mask 0x00200000
+#define EvTyp_SigQuiesce_Mask 0x00000008
+
+#define GnrlMsgFlgs_DOM 0x8000
+#define GnrlMsgFlgs_SndAlrm 0x4000
+#define GnrlMsgFlgs_HoldMsg 0x2000
+
+#define LnTpFlgs_CntlText 0x8000
+#define LnTpFlgs_LabelText 0x4000
+#define LnTpFlgs_DataText 0x2000
+#define LnTpFlgs_EndText 0x1000
+#define LnTpFlgs_PromptText 0x0800
+
+#define SCLP_COMMAND_INITIATED 0
+#define SCLP_BUSY 2
+#define SCLP_NOT_OPERATIONAL 3
+
+typedef unsigned int sclp_cmdw_t;
+
+#define SCLP_CMDW_READDATA 0x00770005
+#define SCLP_CMDW_WRITEDATA 0x00760005
+#define SCLP_CMDW_WRITEMASK 0x00780005
+
+#define GDS_ID_MDSMU 0x1310
+#define GDS_ID_MDSRouteInfo 0x1311
+#define GDS_ID_AgUnWrkCorr 0x1549
+#define GDS_ID_SNACondReport 0x1532
+#define GDS_ID_CPMSU 0x1212
+#define GDS_ID_RoutTargInstr 0x154D
+#define GDS_ID_OpReq 0x8070
+#define GDS_ID_TextCmd 0x1320
+
+#define GDS_KEY_SelfDefTextMsg 0x31
+
+typedef u32 sccb_mask_t; /* ATTENTION: assumes 32bit mask !!! */
+
+struct sccb_header {
+ u16 length;
+ u8 function_code;
+ u8 control_mask[3];
+ u16 response_code;
+} __attribute__((packed));
+
+struct gds_subvector {
+ u8 length;
+ u8 key;
+} __attribute__((packed));
+
+struct gds_vector {
+ u16 length;
+ u16 gds_id;
+} __attribute__((packed));
+
+struct evbuf_header {
+ u16 length;
+ u8 type;
+ u8 flags;
+ u16 _reserved;
+} __attribute__((packed));
+
+struct sclp_req {
+ struct list_head list; /* list_head for request queueing. */
+ sclp_cmdw_t command; /* sclp command to execute */
+ void *sccb; /* pointer to the sccb to execute */
+ char status; /* status of this request */
+ /* Callback that is called after reaching final status. */
+ void (*callback)(struct sclp_req *, void *data);
+ void *callback_data;
+};
+
+#define SCLP_REQ_FILLED 0x00 /* request is ready to be processed */
+#define SCLP_REQ_QUEUED 0x01 /* request is queued to be processed */
+#define SCLP_REQ_RUNNING 0x02 /* request is currently running */
+#define SCLP_REQ_DONE 0x03 /* request is completed successfully */
+#define SCLP_REQ_FAILED 0x05 /* request is finally failed */
+
+/* function pointers that a high level driver has to use for registration */
+/* of some routines it wants to be called from the low level driver */
+struct sclp_register {
+ struct list_head list;
+ /* event masks this user is registered for */
+ sccb_mask_t receive_mask;
+ sccb_mask_t send_mask;
+ /* actually present events */
+ sccb_mask_t sclp_receive_mask;
+ sccb_mask_t sclp_send_mask;
+ /* called if event type availability changes */
+ void (*state_change_fn)(struct sclp_register *);
+ /* called for events in cp_receive_mask/sclp_receive_mask */
+ void (*receiver_fn)(struct evbuf_header *);
+};
+
+/* externals from sclp.c */
+void sclp_add_request(struct sclp_req *req);
+void sclp_sync_wait(void);
+int sclp_register(struct sclp_register *reg);
+void sclp_unregister(struct sclp_register *reg);
+
+/* useful inlines */
+
+/* VM uses EBCDIC 037, LPAR+native(SE+HMC) use EBCDIC 500 */
+/* translate single character from ASCII to EBCDIC */
+static inline unsigned char
+sclp_ascebc(unsigned char ch)
+{
+ return (MACHINE_IS_VM) ? _ascebc[ch] : _ascebc_500[ch];
+}
+
+/* translate string from EBCDIC to ASCII */
+static inline void
+sclp_ebcasc_str(unsigned char *str, int nr)
+{
+ (MACHINE_IS_VM) ? EBCASC(str, nr) : EBCASC_500(str, nr);
+}
+
+/* translate string from ASCII to EBCDIC */
+static inline void
+sclp_ascebc_str(unsigned char *str, int nr)
+{
+ (MACHINE_IS_VM) ? ASCEBC(str, nr) : ASCEBC_500(str, nr);
+}
+
+#endif /* __SCLP_H__ */
diff -urN linux-2.5.48/drivers/s390/char/sclp_con.c linux-2.5.48-s390/drivers/s390/char/sclp_con.c
--- linux-2.5.48/drivers/s390/char/sclp_con.c Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp_con.c Mon Nov 18 20:14:52 2002
@@ -0,0 +1,237 @@
+/*
+ * drivers/s390/char/sclp_con.c
+ * SCLP line mode console driver
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/kmod.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/bootmem.h>
+
+#include "sclp.h"
+#include "sclp_rw.h"
+
+#define SCLP_CON_PRINT_HEADER "sclp console driver: "
+
+#define sclp_console_major 4 /* TTYAUX_MAJOR */
+#define sclp_console_minor 64
+#define sclp_console_name "console"
+
+/* Lock to guard over changes to global variables */
+static spinlock_t sclp_con_lock;
+/* List of free pages that can be used for console output buffering */
+static struct list_head sclp_con_pages;
+/* List of full struct sclp_buffer structures ready for output */
+static struct list_head sclp_con_outqueue;
+/* Counter how many buffers are emitted (max 1) and how many */
+/* are on the output queue. */
+static int sclp_con_buffer_count;
+/* Pointer to current console buffer */
+static struct sclp_buffer *sclp_conbuf;
+/* Timer for delayed output of console messages */
+static struct timer_list sclp_con_timer;
+
+/* Output format for console messages */
+static unsigned short sclp_con_columns;
+static unsigned short sclp_con_width_htab;
+
+static void
+sclp_conbuf_callback(struct sclp_buffer *buffer, int rc)
+{
+ unsigned long flags;
+ struct sclp_buffer *next;
+ void *page;
+
+ /* FIXME: what if rc != 0x0020 */
+ page = sclp_unmake_buffer(buffer);
+ spin_lock_irqsave(&sclp_con_lock, flags);
+ list_add_tail((struct list_head *) page, &sclp_con_pages);
+ sclp_con_buffer_count--;
+ /* Remove buffer from outqueue */
+ list_del(&buffer->list);
+ /* Check if there is a pending buffer on the out queue. */
+ next = NULL;
+ if (!list_empty(&sclp_con_outqueue))
+ next = list_entry(sclp_con_outqueue.next,
+ struct sclp_buffer, list);
+ spin_unlock_irqrestore(&sclp_con_lock, flags);
+ if (next != NULL)
+ sclp_emit_buffer(next, sclp_conbuf_callback);
+}
+
+static inline void
+__sclp_conbuf_emit(struct sclp_buffer *buffer)
+{
+ list_add_tail(&buffer->list, &sclp_con_outqueue);
+ if (sclp_con_buffer_count++ == 0)
+ sclp_emit_buffer(buffer, sclp_conbuf_callback);
+}
+
+/*
+ * When this routine is called from the timer then we flush the
+ * temporary write buffer without further waiting on a final new line.
+ */
+static void
+sclp_console_timeout(unsigned long data)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sclp_con_lock, flags);
+ if (sclp_conbuf != NULL) {
+ __sclp_conbuf_emit(sclp_conbuf);
+ sclp_conbuf = NULL;
+ }
+ spin_unlock_irqrestore(&sclp_con_lock, flags);
+}
+
+/*
+ * Writes the given message to S390 system console
+ */
+void
+sclp_console_write(struct console *console, const char *message,
+ unsigned int count)
+{
+ unsigned long flags;
+ void *page;
+ int written;
+
+ if (count <= 0)
+ return;
+ spin_lock_irqsave(&sclp_con_lock, flags);
+ /*
+ * process escape characters, write message into buffer,
+ * send buffer to SCLP
+ */
+ do {
+ /* make sure we have a console output buffer */
+ if (sclp_conbuf == NULL) {
+ while (list_empty(&sclp_con_pages)) {
+ spin_unlock_irqrestore(&sclp_con_lock, flags);
+ sclp_sync_wait();
+ spin_lock_irqsave(&sclp_con_lock, flags);
+ }
+ page = sclp_con_pages.next;
+ list_del((struct list_head *) page);
+ sclp_conbuf = sclp_make_buffer(page, sclp_con_columns,
+ sclp_con_width_htab);
+ }
+ /* try to write the string to the current output buffer */
+ written = sclp_write(sclp_conbuf, message, count, 0);
+ if (written == -EFAULT || written == count)
+ break;
+ /*
+ * Not all characters could be written to the current
+ * output buffer. Emit the buffer, create a new buffer
+ * and then output the rest of the string.
+ */
+ __sclp_conbuf_emit(sclp_conbuf);
+ sclp_conbuf = NULL;
+ message += written;
+ count -= written;
+ } while (count > 0);
+ /* Setup timer to output current console buffer after 1/10 second */
+ if (sclp_conbuf != NULL && !timer_pending(&sclp_con_timer)) {
+ init_timer(&sclp_con_timer);
+ sclp_con_timer.function = sclp_console_timeout;
+ sclp_con_timer.data = 0UL;
+ sclp_con_timer.expires = jiffies + HZ/10;
+ add_timer(&sclp_con_timer);
+ }
+ spin_unlock_irqrestore(&sclp_con_lock, flags);
+}
+
+/* returns the device number of the SCLP console */
+kdev_t
+sclp_console_device(struct console *c)
+{
+ return mk_kdev(sclp_console_major, sclp_console_minor);
+}
+
+/*
+ * This routine is called from panic when the kernel
+ * is going to give up. We have to make sure that all buffers
+ * will be flushed to the SCLP.
+ */
+void
+sclp_console_unblank(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sclp_con_lock, flags);
+ if (timer_pending(&sclp_con_timer))
+ del_timer(&sclp_con_timer);
+ if (sclp_conbuf != NULL) {
+ __sclp_conbuf_emit(sclp_conbuf);
+ sclp_conbuf = NULL;
+ }
+ while (sclp_con_buffer_count > 0) {
+ spin_unlock_irqrestore(&sclp_con_lock, flags);
+ sclp_sync_wait();
+ spin_lock_irqsave(&sclp_con_lock, flags);
+ }
+ spin_unlock_irqrestore(&sclp_con_lock, flags);
+}
+
+/*
+ * used to register the SCLP console to the kernel and to
+ * give printk necessary information
+ */
+struct console sclp_console =
+{
+ .name = sclp_console_name,
+ .write = sclp_console_write,
+ .device = sclp_console_device,
+ .unblank = sclp_console_unblank,
+ .flags = CON_PRINTBUFFER
+};
+
+/*
+ * called by console_init() in drivers/char/tty_io.c at boot-time.
+ */
+void __init
+sclp_console_init(void)
+{
+ void *page;
+ int i;
+
+ if (!CONSOLE_IS_SCLP)
+ return;
+ if (sclp_rw_init() != 0)
+ return;
+ /* Allocate pages for output buffering */
+ INIT_LIST_HEAD(&sclp_con_pages);
+ for (i = 0; i < MAX_CONSOLE_PAGES; i++) {
+ page = alloc_bootmem_low_pages(PAGE_SIZE);
+ if (page == NULL)
+ return;
+ list_add_tail((struct list_head *) page, &sclp_con_pages);
+ }
+ INIT_LIST_HEAD(&sclp_con_outqueue);
+ spin_lock_init(&sclp_con_lock);
+ sclp_con_buffer_count = 0;
+ sclp_conbuf = NULL;
+ init_timer(&sclp_con_timer);
+
+ /* Set output format */
+ if (MACHINE_IS_VM)
+ /*
+ * save 4 characters for the CPU number
+ * written at start of each line by VM/CP
+ */
+ sclp_con_columns = 76;
+ else
+ sclp_con_columns = 80;
+ sclp_con_width_htab = 8;
+
+ /* enable printkīs access to this driver */
+ register_console(&sclp_console);
+}
diff -urN linux-2.5.48/drivers/s390/char/sclp_cpi.c linux-2.5.48-s390/drivers/s390/char/sclp_cpi.c
--- linux-2.5.48/drivers/s390/char/sclp_cpi.c Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp_cpi.c Mon Nov 18 20:14:52 2002
@@ -0,0 +1,243 @@
+/*
+ * Author: Martin Peschke <mpeschke@de.ibm.com>
+ * Copyright (C) 2001 IBM Entwicklung GmbH, IBM Corporation
+ *
+ * SCLP Control-Program Identification.
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/kmod.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <asm/ebcdic.h>
+#include <asm/semaphore.h>
+
+#include "sclp.h"
+#include "sclp_rw.h"
+
+#define CPI_LENGTH_SYSTEM_TYPE 8
+#define CPI_LENGTH_SYSTEM_NAME 8
+#define CPI_LENGTH_SYSPLEX_NAME 8
+
+struct cpi_evbuf {
+ struct evbuf_header header;
+ u8 id_format;
+ u8 reserved0;
+ u8 system_type[CPI_LENGTH_SYSTEM_TYPE];
+ u64 reserved1;
+ u8 system_name[CPI_LENGTH_SYSTEM_NAME];
+ u64 reserved2;
+ u64 system_level;
+ u64 reserved3;
+ u8 sysplex_name[CPI_LENGTH_SYSPLEX_NAME];
+ u8 reserved4[16];
+} __attribute__((packed));
+
+struct cpi_sccb {
+ struct sccb_header header;
+ struct cpi_evbuf cpi_evbuf;
+} __attribute__((packed));
+
+/* Event type structure for write message and write priority message */
+static struct sclp_register sclp_cpi_event =
+{
+ .send_mask = EvTyp_CtlProgIdent_Mask
+};
+
+MODULE_AUTHOR(
+ "Martin Peschke, IBM Deutschland Entwicklung GmbH "
+ "<mpeschke@de.ibm.com>");
+
+MODULE_DESCRIPTION(
+ "identify this operating system instance to the S/390 "
+ "or zSeries hardware");
+
+static char *system_name = NULL;
+MODULE_PARM(system_name, "s");
+MODULE_PARM_DESC(system_name, "e.g. hostname - max. 8 characters");
+
+static char *sysplex_name = NULL;
+#ifdef ALLOW_SYSPLEX_NAME
+MODULE_PARM(sysplex_name, "s");
+MODULE_PARM_DESC(sysplex_name, "if applicable - max. 8 characters");
+#endif
+
+/* use default value for this field (as well as for system level) */
+static char *system_type = "LINUX";
+
+static int
+cpi_check_parms(void)
+{
+ /* reject if no system type specified */
+ if (!system_type) {
+ printk("cpi: bug: no system type specified\n");
+ return -EINVAL;
+ }
+
+ /* reject if system type larger than 8 characters */
+ if (strlen(system_type) > CPI_LENGTH_SYSTEM_NAME) {
+ printk("cpi: bug: system type has length of %li characters - "
+ "only %i characters supported\n",
+ strlen(system_type), CPI_LENGTH_SYSTEM_TYPE);
+ return -EINVAL;
+ }
+
+ /* reject if no system name specified */
+ if (!system_name) {
+ printk("cpi: no system name specified\n");
+ return -EINVAL;
+ }
+
+ /* reject if system name larger than 8 characters */
+ if (strlen(system_name) > CPI_LENGTH_SYSTEM_NAME) {
+ printk("cpi: system name has length of %li characters - "
+ "only %i characters supported\n",
+ strlen(system_name), CPI_LENGTH_SYSTEM_NAME);
+ return -EINVAL;
+ }
+
+ /* reject if specified sysplex name larger than 8 characters */
+ if (sysplex_name && strlen(sysplex_name) > CPI_LENGTH_SYSPLEX_NAME) {
+ printk("cpi: sysplex name has length of %li characters"
+ " - only %i characters supported\n",
+ strlen(sysplex_name), CPI_LENGTH_SYSPLEX_NAME);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void
+cpi_callback(struct sclp_req *req, void *data)
+{
+ struct semaphore *sem;
+
+ sem = (struct semaphore *) data;
+ up(sem);
+}
+
+static struct sclp_req *
+cpi_prepare_req(void)
+{
+ struct sclp_req *req;
+ struct cpi_sccb *sccb;
+ struct cpi_evbuf *evb;
+
+ req = (struct sclp_req *) kmalloc(sizeof(struct sclp_req), GFP_KERNEL);
+ if (req == NULL)
+ return ERR_PTR(-ENOMEM);
+ sccb = (struct cpi_sccb *) get_free_page(GFP_KERNEL);
+ if (sccb == NULL) {
+ kfree(req);
+ return ERR_PTR(-ENOMEM);
+ }
+ memset(sccb, 0, sizeof(struct cpi_sccb));
+
+ /* setup SCCB for Control-Program Identification */
+ sccb->header.length = sizeof(struct cpi_sccb);
+ sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf);
+ sccb->cpi_evbuf.header.type = 0x0B;
+ evb = &sccb->cpi_evbuf;
+
+ /* set system type */
+ memset(evb->system_type, ' ', CPI_LENGTH_SYSTEM_TYPE);
+ memcpy(evb->system_type, system_type, strlen(system_type));
+ sclp_ascebc_str(evb->system_type, CPI_LENGTH_SYSTEM_TYPE);
+ EBC_TOUPPER(evb->system_type, CPI_LENGTH_SYSTEM_TYPE);
+
+ /* set system name */
+ memset(evb->system_name, ' ', CPI_LENGTH_SYSTEM_NAME);
+ memcpy(evb->system_name, system_name, strlen(system_name));
+ sclp_ascebc_str(evb->system_name, CPI_LENGTH_SYSTEM_NAME);
+ EBC_TOUPPER(evb->system_name, CPI_LENGTH_SYSTEM_NAME);
+
+ /* set sytem level */
+ evb->system_level = LINUX_VERSION_CODE;
+
+ /* set sysplex name */
+ if (sysplex_name) {
+ memset(evb->sysplex_name, ' ', CPI_LENGTH_SYSPLEX_NAME);
+ memcpy(evb->sysplex_name, sysplex_name, strlen(sysplex_name));
+ sclp_ascebc_str(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
+ EBC_TOUPPER(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
+ }
+
+ /* prepare request data structure presented to SCLP driver */
+ req->command = SCLP_CMDW_WRITEDATA;
+ req->sccb = sccb;
+ req->status = SCLP_REQ_FILLED;
+ req->callback = cpi_callback;
+ return req;
+}
+
+static void
+cpi_free_req(struct sclp_req *req)
+{
+ free_page((unsigned long) req->sccb);
+ kfree(req);
+}
+
+static int __init
+cpi_module_init(void)
+{
+ struct semaphore sem;
+ struct sclp_req *req;
+ int rc;
+
+ rc = cpi_check_parms();
+ if (rc)
+ return rc;
+
+ rc = sclp_register(&sclp_cpi_event);
+ if (rc) {
+ /* could not register sclp event. Die. */
+ printk("cpi: could not register to hardware console.\n");
+ return -EINVAL;
+ }
+ if (!(sclp_cpi_event.sclp_send_mask & EvTyp_CtlProgIdent_Mask)) {
+ printk("cpi: no control program identification support\n");
+ sclp_unregister(&sclp_cpi_event);
+ return -ENOTSUPP;
+ }
+
+ req = cpi_prepare_req();
+ if (IS_ERR(req)) {
+ printk("cpi: couldn't allocate request\n");
+ sclp_unregister(&sclp_cpi_event);
+ return PTR_ERR(req);
+ }
+
+ /* Prepare semaphore */
+ sema_init(&sem, 0);
+ req->callback_data = &sem;
+ /* Add request to sclp queue */
+ sclp_add_request(req);
+ /* make "insmod" sleep until callback arrives */
+ down(&sem);
+
+ rc = ((struct cpi_sccb *) req->sccb)->header.response_code;
+ if (rc != 0x0020) {
+ printk("cpi: failed with response code 0x%x\n", rc);
+ rc = -ECOMM;
+ } else
+ rc = 0;
+
+ cpi_free_req(req);
+
+ return rc;
+}
+
+
+static void __exit cpi_module_exit(void)
+{
+}
+
+
+/* declare driver module init/cleanup functions */
+module_init(cpi_module_init);
+module_exit(cpi_module_exit);
+
diff -urN linux-2.5.48/drivers/s390/char/sclp_rw.c linux-2.5.48-s390/drivers/s390/char/sclp_rw.c
--- linux-2.5.48/drivers/s390/char/sclp_rw.c Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp_rw.c Mon Nov 18 20:14:52 2002
@@ -0,0 +1,458 @@
+/*
+ * drivers/s390/char/sclp_rw.c
+ * driver: reading from and writing to system console on S/390 via SCLP
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/kmod.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/ctype.h>
+#include <asm/uaccess.h>
+
+#include "sclp.h"
+#include "sclp_rw.h"
+
+#define SCLP_RW_PRINT_HEADER "sclp low level driver: "
+
+/*
+ * The room for the SCCB (only for writing) is not equal to a pages size
+ * (as it is specified as the maximum size in the the SCLP ducumentation)
+ * because of the additional data structure described above.
+ */
+#define MAX_SCCB_ROOM (PAGE_SIZE - sizeof(struct sclp_buffer))
+
+/* Event type structure for write message and write priority message */
+struct sclp_register sclp_rw_event = {
+ .send_mask = EvTyp_Msg_Mask | EvTyp_PMsgCmd_Mask
+};
+
+/*
+ * Setup a sclp write buffer. Gets a page as input (4K) and returns
+ * a pointer to a struct sclp_buffer structure that is located at the
+ * end of the input page. This reduces the buffer space by a few
+ * bytes but simplifies things.
+ */
+struct sclp_buffer *
+sclp_make_buffer(void *page, unsigned short columns, unsigned short htab)
+{
+ struct sclp_buffer *buffer;
+ struct write_sccb *sccb;
+
+ sccb = (struct write_sccb *) page;
+ /*
+ * We keep the struct sclp_buffer structure at the end
+ * of the sccb page.
+ */
+ buffer = ((struct sclp_buffer *) ((addr_t) sccb + PAGE_SIZE)) - 1;
+ buffer->sccb = sccb;
+ buffer->mto_number = 0;
+ buffer->mto_char_sum = 0;
+ buffer->current_line = NULL;
+ buffer->current_length = 0;
+ buffer->columns = columns;
+ buffer->htab = htab;
+
+ /* initialize sccb */
+ memset(sccb, 0, sizeof(struct write_sccb));
+ sccb->header.length = sizeof(struct write_sccb);
+ sccb->msg_buf.header.length = sizeof(struct msg_buf);
+ sccb->msg_buf.header.type = EvTyp_Msg;
+ sccb->msg_buf.mdb.header.length = sizeof(struct mdb);
+ sccb->msg_buf.mdb.header.type = 1;
+ sccb->msg_buf.mdb.header.tag = 0xD4C4C240; /* ebcdic "MDB " */
+ sccb->msg_buf.mdb.header.revision_code = 1;
+ sccb->msg_buf.mdb.go.length = sizeof(struct go);
+ sccb->msg_buf.mdb.go.type = 1;
+
+ return buffer;
+}
+
+/*
+ * Return a pointer to the orignal page that has been used to create
+ * the buffer.
+ */
+void *
+sclp_unmake_buffer(struct sclp_buffer *buffer)
+{
+ return buffer->sccb;
+}
+
+/*
+ * Creates a new Message Text Object with enough room for str_len
+ * characters. This function will create a new sccb for buffering
+ * the mto if the current buffer sccb is full. A full buffer sccb
+ * is submitted for output.
+ * Returns a pointer to the start of the string in the mto.
+ */
+static int
+sclp_create_mto(struct sclp_buffer *buffer, int max_len)
+{
+ struct write_sccb *sccb;
+ struct mto *mto;
+ int mto_size;
+
+ /* max size of new Message Text Object including message text */
+ mto_size = sizeof(struct mto) + max_len;
+
+ /* check if current buffer sccb can contain the mto */
+ sccb = buffer->sccb;
+ if ((MAX_SCCB_ROOM - sccb->header.length) < mto_size)
+ return -ENOMEM;
+
+ /* find address of new message text object */
+ mto = (struct mto *)(((unsigned long) sccb) + sccb->header.length);
+
+ /*
+ * fill the new Message-Text Object,
+ * starting behind the former last byte of the SCCB
+ */
+ memset(mto, 0, sizeof(struct mto));
+ mto->length = sizeof(struct mto);
+ mto->type = 4; /* message text object */
+ mto->line_type_flags = LnTpFlgs_EndText; /* end text */
+
+ /* set pointer to first byte after struct mto. */
+ buffer->current_line = (char *) (mto + 1);
+ buffer->current_length = 0;
+
+ return 0;
+}
+
+/*
+ * Add the mto created with sclp_create_mto to the buffer sccb using
+ * the str_len parameter as the real length of the string.
+ */
+static void
+sclp_add_mto(struct sclp_buffer *buffer)
+{
+ struct write_sccb *sccb;
+ struct mto *mto;
+ int str_len, mto_size;
+
+ str_len = buffer->current_length;
+ buffer->current_line = NULL;
+ buffer->current_length = 0;
+
+ /* real size of new Message Text Object including message text */
+ mto_size = sizeof(struct mto) + str_len;
+
+ /* find address of new message text object */
+ sccb = buffer->sccb;
+ mto = (struct mto *)(((unsigned long) sccb) + sccb->header.length);
+
+ /* set size of message text object */
+ mto->length = mto_size;
+
+ /*
+ * update values of sizes
+ * (SCCB, Event(Message) Buffer, Message Data Block)
+ */
+ sccb->header.length += mto_size;
+ sccb->msg_buf.header.length += mto_size;
+ sccb->msg_buf.mdb.header.length += mto_size;
+
+ /*
+ * count number of buffered messages (= number of Message Text
+ * Objects) and number of buffered characters
+ * for the SCCB currently used for buffering and at all
+ */
+ buffer->mto_number++;
+ buffer->mto_char_sum += str_len;
+}
+
+void
+sclp_move_current_line(struct sclp_buffer *to, struct sclp_buffer *from)
+{
+ if (from->current_line == NULL)
+ return;
+ if (sclp_create_mto(to, from->columns) != 0)
+ return;
+ if (from->current_length > 0) {
+ memcpy(to->current_line,
+ from->current_line - from->current_length,
+ from->current_length);
+ to->current_line += from->current_length;
+ to->current_length = from->current_length;
+ }
+ from->current_line = NULL;
+}
+
+/*
+ * processing of a message including escape characters,
+ * returns number of characters written to the output sccb
+ * ("processed" means that is not guaranteed that the character have already
+ * been sent to the SCLP but that it will be done at least next time the SCLP
+ * is not busy)
+ */
+int
+sclp_write(struct sclp_buffer *buffer,
+ const char *msg, int count, int from_user)
+{
+ int spaces, i_msg;
+ char ch;
+ int rc;
+
+ /*
+ * parse msg for escape sequences (\t,\v ...) and put formated
+ * msg into an mto (created by sclp_create_mto).
+ *
+ * We have to do this work ourselfs because there is no support for
+ * these characters on the native machine and only partial support
+ * under VM (Why does VM interpret \n but the native machine doesn't ?)
+ *
+ * Depending on i/o-control setting the message is always written
+ * immediatly or we wait for a final new line maybe coming with the
+ * next message. Besides we avoid a buffer overrun by writing its
+ * content.
+ *
+ * RESTRICTIONS:
+ *
+ * \r and \b work within one line because we are not able to modify
+ * previous output that have already been accepted by the SCLP.
+ *
+ * \t combined with following \r is not correctly represented because
+ * \t is expanded to some spaces but \r does not know about a
+ * previous \t and decreases the current position by one column.
+ * This is in order to a slim and quick implementation.
+ */
+ for (i_msg = 0; i_msg < count; i_msg++) {
+ if (from_user) {
+ if (get_user(ch, msg + i_msg) != 0)
+ return -EFAULT;
+ } else
+ ch = msg[i_msg];
+
+ switch (ch) {
+ case '\n': /* new line, line feed (ASCII) */
+ /* check if new mto needs to be created */
+ if (buffer->current_line == NULL) {
+ rc = sclp_create_mto(buffer, 0);
+ if (rc)
+ return i_msg;
+ }
+ sclp_add_mto(buffer);
+ break;
+ case '\a': /* bell, one for several times */
+ /* set SCLP sound alarm bit in General Object */
+ buffer->sccb->msg_buf.mdb.go.general_msg_flags |=
+ GnrlMsgFlgs_SndAlrm;
+ break;
+ case '\t': /* horizontal tabulator */
+ /* check if new mto needs to be created */
+ if (buffer->current_line == NULL) {
+ rc = sclp_create_mto(buffer, buffer->columns);
+ if (rc)
+ return i_msg;
+ }
+ /* "go to (next htab-boundary + 1, same line)" */
+ do {
+ if (buffer->current_length >= buffer->columns)
+ break;
+ /* ok, add a blank */
+ *buffer->current_line++ = 0x40;
+ buffer->current_length++;
+ } while (buffer->current_length % buffer->htab);
+ break;
+ case '\f': /* form feed */
+ case '\v': /* vertical tabulator */
+ /* "go to (actual column, actual line + 1)" */
+ /* = new line, leading spaces */
+ if (buffer->current_line != NULL) {
+ spaces = buffer->current_length;
+ sclp_add_mto(buffer);
+ rc = sclp_create_mto(buffer, buffer->columns);
+ if (rc)
+ return i_msg;
+ memset(buffer->current_line, 0x40, spaces);
+ buffer->current_line += spaces;
+ buffer->current_length = spaces;
+ } else {
+ /* one an empty line this is the same as \n */
+ rc = sclp_create_mto(buffer, buffer->columns);
+ if (rc)
+ return i_msg;
+ sclp_add_mto(buffer);
+ }
+ break;
+ case '\b': /* backspace */
+ /* "go to (actual column - 1, actual line)" */
+ /* decrement counter indicating position, */
+ /* do not remove last character */
+ if (buffer->current_line != NULL &&
+ buffer->current_length > 0) {
+ buffer->current_length--;
+ buffer->current_line--;
+ }
+ break;
+ case 0x00: /* end of string */
+ /* transfer current line to SCCB */
+ if (buffer->current_line != NULL)
+ sclp_add_mto(buffer);
+ /* skip the rest of the message including the 0 byte */
+ i_msg = count;
+ break;
+ default: /* no escape character */
+ /* do not output unprintable characters */
+ if (!isprint(ch))
+ break;
+ /* check if new mto needs to be created */
+ if (buffer->current_line == NULL) {
+ rc = sclp_create_mto(buffer, buffer->columns);
+ if (rc)
+ return i_msg;
+ }
+ *buffer->current_line++ = sclp_ascebc(ch);
+ buffer->current_length++;
+ break;
+ }
+ /* check if current mto is full */
+ if (buffer->current_line != NULL &&
+ buffer->current_length >= buffer->columns)
+ sclp_add_mto(buffer);
+ }
+
+ /* return number of processed characters */
+ return i_msg;
+}
+
+/*
+ * Return the number of free bytes in the sccb
+ */
+int
+sclp_buffer_space(struct sclp_buffer *buffer)
+{
+ int count;
+
+ count = MAX_SCCB_ROOM - buffer->sccb->header.length;
+ if (buffer->current_line != NULL)
+ count -= sizeof(struct mto) + buffer->current_length;
+ return count;
+}
+
+/*
+ * Return number of characters in buffer
+ */
+int
+sclp_chars_in_buffer(struct sclp_buffer *buffer)
+{
+ int count;
+
+ count = buffer->mto_char_sum;
+ if (buffer->current_line != NULL)
+ count += buffer->current_length;
+ return count;
+}
+
+/*
+ * sets or provides some values that influence the drivers behaviour
+ */
+void
+sclp_set_columns(struct sclp_buffer *buffer, unsigned short columns)
+{
+ buffer->columns = columns;
+ if (buffer->current_line != NULL &&
+ buffer->current_length > buffer->columns)
+ sclp_add_mto(buffer);
+}
+
+void
+sclp_set_htab(struct sclp_buffer *buffer, unsigned short htab)
+{
+ buffer->htab = htab;
+}
+
+/*
+ * called by sclp_console_init and/or sclp_tty_init
+ */
+int
+sclp_rw_init(void)
+{
+ static int init_done = 0;
+
+ if (init_done)
+ return 0;
+ init_done = 1;
+ return sclp_register(&sclp_rw_event);
+}
+
+/*
+ * second half of Write Event Data-function that has to be done after
+ * interruption indicating completion of Service Call.
+ */
+static void
+sclp_writedata_callback(struct sclp_req *request, void *data)
+{
+ struct sclp_buffer *buffer;
+ struct write_sccb *sccb;
+
+ buffer = (struct sclp_buffer *) data;
+ sccb = buffer->sccb;
+
+ /* FIXME: proper error handling */
+ /* check SCLP response code and choose suitable action */
+ switch (sccb->header.response_code) {
+ case 0x0020 :
+ /* normal completion, buffer processed, message(s) sent */
+ break;
+
+ case 0x0340: /* contained SCLP equipment check */
+ case 0x40F0: /* function code disabled in SCLP receive mask */
+ break;
+ default:
+ /* sclp_free_sccb(sccb); */
+ printk(KERN_WARNING SCLP_RW_PRINT_HEADER
+ "write event data failed "
+ "(response code: 0x%x SCCB address %p).\n",
+ sccb->header.response_code, sccb);
+ break;
+ }
+ if (buffer->callback != NULL)
+ buffer->callback(buffer, sccb->header.response_code);
+}
+
+/*
+ * Setup the request structure in the struct sclp_buffer to do SCLP Write
+ * Event Data and pass the request to the core SCLP loop.
+ */
+void
+sclp_emit_buffer(struct sclp_buffer *buffer,
+ void (*callback)(struct sclp_buffer *, int))
+{
+ struct write_sccb *sccb;
+
+ /* add current line if there is one */
+ if (buffer->current_line != NULL)
+ sclp_add_mto(buffer);
+
+ /* Are there messages in the output buffer ? */
+ if (buffer->mto_number <= 0)
+ return;
+
+ sccb = buffer->sccb;
+ if (sclp_rw_event.sclp_send_mask & EvTyp_Msg_Mask)
+ /* Use normal write message */
+ sccb->msg_buf.header.type = EvTyp_Msg;
+ else if (sclp_rw_event.sclp_send_mask & EvTyp_PMsgCmd_Mask)
+ /* Use write priority message */
+ sccb->msg_buf.header.type = EvTyp_PMsgCmd;
+ else {
+ callback(buffer, -ENOSYS);
+ return;
+ }
+ buffer->request.command = SCLP_CMDW_WRITEDATA;
+ buffer->request.status = SCLP_REQ_FILLED;
+ buffer->request.callback = sclp_writedata_callback;
+ buffer->request.callback_data = buffer;
+ buffer->request.sccb = sccb;
+ buffer->callback = callback;
+ sclp_add_request(&buffer->request);
+}
diff -urN linux-2.5.48/drivers/s390/char/sclp_rw.h linux-2.5.48-s390/drivers/s390/char/sclp_rw.h
--- linux-2.5.48/drivers/s390/char/sclp_rw.h Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp_rw.h Mon Nov 18 20:14:52 2002
@@ -0,0 +1,94 @@
+/*
+ * drivers/s390/char/sclp_rw.h
+ * interface to the SCLP-read/write driver
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef __SCLP_RW_H__
+#define __SCLP_RW_H__
+
+struct mto {
+ u16 length;
+ u16 type;
+ u16 line_type_flags;
+ u8 alarm_control;
+ u8 _reserved[3];
+} __attribute__((packed));
+
+struct go {
+ u16 length;
+ u16 type;
+ u32 domid;
+ u8 hhmmss_time[8];
+ u8 th_time[3];
+ u8 reserved_0;
+ u8 dddyyyy_date[7];
+ u8 _reserved_1;
+ u16 general_msg_flags;
+ u8 _reserved_2[10];
+ u8 originating_system_name[8];
+ u8 job_guest_name[8];
+} __attribute__((packed));
+
+struct mdb_header {
+ u16 length;
+ u16 type;
+ u32 tag;
+ u32 revision_code;
+} __attribute__((packed));
+
+struct mdb {
+ struct mdb_header header;
+ struct go go;
+} __attribute__((packed));
+
+struct msg_buf {
+ struct evbuf_header header;
+ struct mdb mdb;
+} __attribute__((packed));
+
+struct write_sccb {
+ struct sccb_header header;
+ struct msg_buf msg_buf;
+} __attribute__((packed));
+
+/* The number of empty mto buffers that can be contained in a single sccb. */
+#define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
+ sizeof(struct write_sccb)) / sizeof(struct mto))
+
+/*
+ * data structure for information about list of SCCBs (only for writing),
+ * will be located at the end of a SCCBs page
+ */
+struct sclp_buffer {
+ struct list_head list; /* list_head for sccb_info chain */
+ struct sclp_req request;
+ struct write_sccb *sccb;
+ char *current_line;
+ int current_length;
+ /* output format settings */
+ unsigned short columns;
+ unsigned short htab;
+ /* statistics about this buffer */
+ unsigned int mto_char_sum; /* # chars in sccb */
+ unsigned int mto_number; /* # mtos in sccb */
+ /* Callback that is called after reaching final status. */
+ void (*callback)(struct sclp_buffer *, int);
+};
+
+int sclp_rw_init(void);
+struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
+void *sclp_unmake_buffer(struct sclp_buffer *);
+int sclp_buffer_space(struct sclp_buffer *);
+int sclp_write(struct sclp_buffer *buffer, const char *, int, int);
+void sclp_move_current_line(struct sclp_buffer *, struct sclp_buffer *);
+void sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
+void sclp_set_columns(struct sclp_buffer *, unsigned short);
+void sclp_set_htab(struct sclp_buffer *, unsigned short);
+int sclp_chars_in_buffer(struct sclp_buffer *);
+
+#endif /* __SCLP_RW_H__ */
diff -urN linux-2.5.48/drivers/s390/char/sclp_tty.c linux-2.5.48-s390/drivers/s390/char/sclp_tty.c
--- linux-2.5.48/drivers/s390/char/sclp_tty.c Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp_tty.c Mon Nov 18 20:14:52 2002
@@ -0,0 +1,798 @@
+/*
+ * drivers/s390/char/sclp_tty.c
+ * SCLP line mode terminal driver.
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/kmod.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+
+#include "ctrlchar.h"
+#include "sclp.h"
+#include "sclp_rw.h"
+#include "sclp_tty.h"
+
+#define SCLP_TTY_PRINT_HEADER "sclp tty driver: "
+
+/*
+ * size of a buffer that collects single characters coming in
+ * via sclp_tty_put_char()
+ */
+#define SCLP_TTY_BUF_SIZE 512
+
+/*
+ * There is excatly one SCLP terminal, so we can keep things simple
+ * and allocate all variables statically.
+ */
+
+/* Lock to guard over changes to global variables. */
+static spinlock_t sclp_tty_lock;
+/* List of free pages that can be used for console output buffering. */
+static struct list_head sclp_tty_pages;
+/* List of full struct sclp_buffer structures ready for output. */
+static struct list_head sclp_tty_outqueue;
+/* Counter how many buffers are emitted. */
+static int sclp_tty_buffer_count;
+/* Pointer to current console buffer. */
+static struct sclp_buffer *sclp_ttybuf;
+/* Timer for delayed output of console messages. */
+static struct timer_list sclp_tty_timer;
+/* Waitqueue to wait for buffers to get empty. */
+static wait_queue_head_t sclp_tty_waitq;
+
+static struct tty_struct *sclp_tty;
+static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
+static unsigned short int sclp_tty_chars_count;
+
+static struct tty_driver sclp_tty_driver;
+static struct tty_struct * sclp_tty_table[1];
+static struct termios * sclp_tty_termios[1];
+static struct termios * sclp_tty_termios_locked[1];
+static int sclp_tty_refcount = 0;
+
+extern struct termios tty_std_termios;
+
+static struct sclp_ioctls sclp_ioctls;
+static struct sclp_ioctls sclp_ioctls_init =
+{
+ 8, /* 1 hor. tab. = 8 spaces */
+ 0, /* no echo of input by this driver */
+ 80, /* 80 characters/line */
+ 1, /* write after 1/10 s without final new line */
+ MAX_KMEM_PAGES, /* quick fix: avoid __alloc_pages */
+ MAX_KMEM_PAGES, /* take 32/64 pages from kernel memory, */
+ 0, /* do not convert to lower case */
+ 0x6c /* to seprate upper and lower case */
+ /* ('%' in EBCDIC) */
+};
+
+/* This routine is called whenever we try to open a SCLP terminal. */
+static int
+sclp_tty_open(struct tty_struct *tty, struct file *filp)
+{
+ /* only 1 SCLP terminal supported */
+ if (minor(tty->device) != tty->driver.minor_start)
+ return -ENODEV;
+ sclp_tty = tty;
+ tty->driver_data = NULL;
+ tty->low_latency = 0;
+ return 0;
+}
+
+/* This routine is called when the SCLP terminal is closed. */
+static void
+sclp_tty_close(struct tty_struct *tty, struct file *filp)
+{
+ /* only 1 SCLP terminal supported */
+ if (minor(tty->device) != tty->driver.minor_start)
+ return;
+ if (tty->count > 1)
+ return;
+ sclp_tty = NULL;
+}
+
+/* execute commands to control the i/o behaviour of the SCLP tty at runtime */
+static int
+sclp_tty_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ unsigned long flags;
+ unsigned int obuf;
+ int check;
+ int rc;
+
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ rc = 0;
+ check = 0;
+ switch (cmd) {
+ case TIOCSCLPSHTAB:
+ /* set width of horizontal tab */
+ if (get_user(sclp_ioctls.htab, (unsigned short *) arg))
+ rc = -EFAULT;
+ else
+ check = 1;
+ break;
+ case TIOCSCLPGHTAB:
+ /* get width of horizontal tab */
+ if (put_user(sclp_ioctls.htab, (unsigned short *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSECHO:
+ /* enable/disable echo of input */
+ if (get_user(sclp_ioctls.echo, (unsigned char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGECHO:
+ /* Is echo of input enabled ? */
+ if (put_user(sclp_ioctls.echo, (unsigned char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSCOLS:
+ /* set number of columns for output */
+ if (get_user(sclp_ioctls.columns, (unsigned short *) arg))
+ rc = -EFAULT;
+ else
+ check = 1;
+ break;
+ case TIOCSCLPGCOLS:
+ /* get number of columns for output */
+ if (put_user(sclp_ioctls.columns, (unsigned short *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSNL:
+ /* enable/disable writing without final new line character */
+ if (get_user(sclp_ioctls.final_nl, (signed char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGNL:
+ /* Is writing without final new line character enabled ? */
+ if (put_user(sclp_ioctls.final_nl, (signed char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSOBUF:
+ /*
+ * set the maximum buffers size for output, will be rounded
+ * up to next 4kB boundary and stored as number of SCCBs
+ * (4kB Buffers) limitation: 256 x 4kB
+ */
+ if (get_user(obuf, (unsigned int *) arg) == 0) {
+ if (obuf & 0xFFF)
+ sclp_ioctls.max_sccb = (obuf >> 12) + 1;
+ else
+ sclp_ioctls.max_sccb = (obuf >> 12);
+ } else
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGOBUF:
+ /* get the maximum buffers size for output */
+ obuf = sclp_ioctls.max_sccb << 12;
+ if (put_user(obuf, (unsigned int *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGKBUF:
+ /* get the number of buffers got from kernel at startup */
+ if (put_user(sclp_ioctls.kmem_sccb, (unsigned short *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSCASE:
+ /* enable/disable conversion from upper to lower case */
+ if (get_user(sclp_ioctls.tolower, (unsigned char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGCASE:
+ /* Is conversion from upper to lower case of input enabled? */
+ if (put_user(sclp_ioctls.tolower, (unsigned char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSDELIM:
+ /*
+ * set special character used for seperating upper and
+ * lower case, 0x00 disables this feature
+ */
+ if (get_user(sclp_ioctls.delim, (unsigned char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPGDELIM:
+ /*
+ * get special character used for seperating upper and
+ * lower case, 0x00 disables this feature
+ */
+ if (put_user(sclp_ioctls.delim, (unsigned char *) arg))
+ rc = -EFAULT;
+ break;
+ case TIOCSCLPSINIT:
+ /* set initial (default) sclp ioctls */
+ sclp_ioctls = sclp_ioctls_init;
+ check = 1;
+ break;
+ default:
+ rc = -ENOIOCTLCMD;
+ break;
+ }
+ if (check) {
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ if (sclp_ttybuf != NULL) {
+ sclp_set_htab(sclp_ttybuf, sclp_ioctls.htab);
+ sclp_set_columns(sclp_ttybuf, sclp_ioctls.columns);
+ }
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ }
+ return rc;
+}
+
+/*
+ * This routine returns the numbers of characters the tty driver
+ * will accept for queuing to be written. This number is subject
+ * to change as output buffers get emptied, or if the output flow
+ * control is acted. This is not an exact number because not every
+ * character needs the same space in the sccb. The worst case is
+ * a string of newlines. Every newlines creates a new mto which
+ * needs 8 bytes.
+ */
+static int
+sclp_tty_write_room (struct tty_struct *tty)
+{
+ unsigned long flags;
+ struct list_head *l;
+ int count;
+
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ count = 0;
+ if (sclp_ttybuf != NULL)
+ count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
+ list_for_each(l, &sclp_tty_pages)
+ count += NR_EMPTY_MTO_PER_SCCB;
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ return count;
+}
+
+static void
+sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
+{
+ unsigned long flags;
+ struct sclp_buffer *next;
+ void *page;
+
+ /* FIXME: what if rc != 0x0020 */
+ page = sclp_unmake_buffer(buffer);
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ list_add_tail((struct list_head *) page, &sclp_tty_pages);
+ sclp_tty_buffer_count--;
+ /* Remove buffer from outqueue */
+ list_del(&buffer->list);
+ /* Check if there is a pending buffer on the out queue. */
+ next = NULL;
+ if (!list_empty(&sclp_tty_outqueue))
+ next = list_entry(sclp_tty_outqueue.next,
+ struct sclp_buffer, list);
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ if (next != NULL)
+ sclp_emit_buffer(next, sclp_ttybuf_callback);
+ wake_up(&sclp_tty_waitq);
+ /* check if the tty needs a wake up call */
+ if (sclp_tty != NULL) {
+ if ((sclp_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ sclp_tty->ldisc.write_wakeup)
+ (sclp_tty->ldisc.write_wakeup)(sclp_tty);
+ wake_up_interruptible(&sclp_tty->write_wait);
+ }
+}
+
+static inline void
+__sclp_ttybuf_emit(struct sclp_buffer *buffer)
+{
+ list_add_tail(&buffer->list, &sclp_tty_outqueue);
+ if (sclp_tty_buffer_count++ == 0)
+ sclp_emit_buffer(buffer, sclp_ttybuf_callback);
+}
+
+/*
+ * When this routine is called from the timer then we flush the
+ * temporary write buffer.
+ */
+static void
+sclp_tty_timeout(unsigned long data)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ if (sclp_ttybuf != NULL) {
+ __sclp_ttybuf_emit(sclp_ttybuf);
+ sclp_ttybuf = NULL;
+ }
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+}
+
+/*
+ * Write a string to the sclp tty.
+ */
+static void
+sclp_tty_write_string(const unsigned char *str, int count, int from_user)
+{
+ unsigned long flags;
+ void *page;
+ int written;
+
+ if (count <= 0)
+ return;
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ do {
+ /* Create a sclp output buffer if none exists yet */
+ if (sclp_ttybuf == NULL) {
+ while (list_empty(&sclp_tty_pages)) {
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ wait_event(sclp_tty_waitq,
+ !list_empty(&sclp_tty_pages));
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ }
+ page = sclp_tty_pages.next;
+ list_del((struct list_head *) page);
+ sclp_ttybuf = sclp_make_buffer(page,
+ sclp_ioctls.columns,
+ sclp_ioctls.htab);
+ }
+ /* try to write the string to the current output buffer */
+ written = sclp_write(sclp_ttybuf, str, count, from_user);
+ if (written == -EFAULT || written == count)
+ break;
+ /*
+ * Not all characters could be written to the current
+ * output buffer. Emit the buffer, create a new buffer
+ * and then output the rest of the string.
+ */
+ __sclp_ttybuf_emit(sclp_ttybuf);
+ sclp_ttybuf = NULL;
+ str += written;
+ count -= written;
+ } while (count > 0);
+ /* Setup timer to output current console buffer after 1/10 second */
+ if (sclp_ioctls.final_nl) {
+ if (sclp_ttybuf != NULL && !timer_pending(&sclp_tty_timer)) {
+ init_timer(&sclp_tty_timer);
+ sclp_tty_timer.function = sclp_tty_timeout;
+ sclp_tty_timer.data = 0UL;
+ sclp_tty_timer.expires = jiffies + HZ/10;
+ add_timer(&sclp_tty_timer);
+ }
+ } else {
+ __sclp_ttybuf_emit(sclp_ttybuf);
+ sclp_ttybuf = NULL;
+ }
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+}
+
+/*
+ * This routine is called by the kernel to write a series of characters to the
+ * tty device. The characters may come from user space or kernel space. This
+ * routine will return the number of characters actually accepted for writing.
+ */
+static int
+sclp_tty_write(struct tty_struct *tty, int from_user,
+ const unsigned char *buf, int count)
+{
+ if (sclp_tty_chars_count > 0) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
+ sclp_tty_chars_count = 0;
+ }
+ sclp_tty_write_string(buf, count, from_user);
+ return count;
+}
+
+/*
+ * This routine is called by the kernel to write a single character to the tty
+ * device. If the kernel uses this routine, it must call the flush_chars()
+ * routine (if defined) when it is done stuffing characters into the driver.
+ *
+ * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
+ * If the given character is a '\n' the contents of the SCLP write buffer
+ * - including previous characters from sclp_tty_put_char() and strings from
+ * sclp_write() without final '\n' - will be written.
+ */
+static void
+sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ sclp_tty_chars[sclp_tty_chars_count++] = ch;
+ if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
+ sclp_tty_chars_count = 0;
+ }
+}
+
+/*
+ * This routine is called by the kernel after it has written a series of
+ * characters to the tty device using put_char().
+ */
+static void
+sclp_tty_flush_chars(struct tty_struct *tty)
+{
+ if (sclp_tty_chars_count > 0) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
+ sclp_tty_chars_count = 0;
+ }
+}
+
+/*
+ * This routine returns the number of characters in the write buffer of the
+ * SCLP driver. The provided number includes all characters that are stored
+ * in the SCCB (will be written next time the SCLP is not busy) as well as
+ * characters in the write buffer (will not be written as long as there is a
+ * final line feed missing).
+ */
+static int
+sclp_tty_chars_in_buffer(struct tty_struct *tty)
+{
+ unsigned long flags;
+ struct list_head *l;
+ struct sclp_buffer *t;
+ int count;
+
+ spin_lock_irqsave(&sclp_tty_lock, flags);
+ count = 0;
+ if (sclp_ttybuf != NULL)
+ count = sclp_chars_in_buffer(sclp_ttybuf);
+ list_for_each(l, &sclp_tty_outqueue) {
+ t = list_entry(l, struct sclp_buffer, list);
+ count += sclp_chars_in_buffer(sclp_ttybuf);
+ }
+ spin_unlock_irqrestore(&sclp_tty_lock, flags);
+ return count;
+}
+
+/*
+ * removes all content from buffers of low level driver
+ */
+static void
+sclp_tty_flush_buffer(struct tty_struct *tty)
+{
+ if (sclp_tty_chars_count > 0) {
+ sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
+ sclp_tty_chars_count = 0;
+ }
+}
+
+/*
+ * push input to tty
+ */
+void sclp_tty_input(unsigned char* buf, unsigned int count)
+{
+ unsigned int cchar;
+
+ /*
+ * If this tty driver is currently closed
+ * then throw the received input away.
+ */
+ if (sclp_tty == NULL)
+ return;
+ cchar = ctrlchar_handle(buf, count, sclp_tty);
+ switch (cchar & CTRLCHAR_MASK) {
+ case CTRLCHAR_SYSRQ:
+ break;
+ case CTRLCHAR_CTRL:
+ sclp_tty->flip.count++;
+ *sclp_tty->flip.flag_buf_ptr++ = TTY_NORMAL;
+ *sclp_tty->flip.char_buf_ptr++ = cchar;
+ tty_flip_buffer_push(sclp_tty);
+ break;
+ case CTRLCHAR_NONE:
+ /* send (normal) input to line discipline */
+ memcpy(sclp_tty->flip.char_buf_ptr, buf, count);
+ if (count < 2 ||
+ strncmp (buf + count - 2, "^n", 2) ||
+ strncmp (buf + count - 2, "\0252n", 2)) {
+ sclp_tty->flip.char_buf_ptr[count] = '\n';
+ count++;
+ } else
+ count -= 2;
+ memset(sclp_tty->flip.flag_buf_ptr, TTY_NORMAL, count);
+ sclp_tty->flip.char_buf_ptr += count;
+ sclp_tty->flip.flag_buf_ptr += count;
+ sclp_tty->flip.count += count;
+ tty_flip_buffer_push(sclp_tty);
+ break;
+ }
+}
+
+/*
+ * get a EBCDIC string in upper/lower case,
+ * find out characters in lower/upper case seperated by a special character,
+ * modifiy original string,
+ * returns length of resulting string
+ */
+static int
+sclp_switch_cases(unsigned char *buf, int count,
+ unsigned char delim, int tolower)
+{
+ unsigned char *ip, *op;
+ int toggle;
+
+ /* initially changing case is off */
+ toggle = 0;
+ ip = op = buf;
+ while (count-- > 0) {
+ /* compare with special character */
+ if (*ip == delim) {
+ /* followed by another special character? */
+ if (count && ip[1] == delim) {
+ /*
+ * ... then put a single copy of the special
+ * character to the output string
+ */
+ *op++ = *ip++;
+ count--;
+ } else
+ /*
+ * ... special character follower by a normal
+ * character toggles the case change behaviour
+ */
+ toggle = ~toggle;
+ /* skip special character */
+ ip++;
+ } else
+ /* not the special character */
+ if (toggle)
+ /* but case switching is on */
+ if (tolower)
+ /* switch to uppercase */
+ *op++ = _ebc_toupper[(int) *ip++];
+ else
+ /* switch to lowercase */
+ *op++ = _ebc_tolower[(int) *ip++];
+ else
+ /* no case switching, copy the character */
+ *op++ = *ip++;
+ }
+ /* return length of reformatted string. */
+ return op - buf;
+}
+
+static void
+sclp_get_input(char *start, char *end)
+{
+ int count;
+
+ count = end - start;
+ /*
+ * if set in ioctl convert EBCDIC to lower case
+ * (modify original input in SCCB)
+ */
+ if (sclp_ioctls.tolower)
+ EBC_TOLOWER(start, count);
+
+ /*
+ * if set in ioctl find out characters in lower or upper case
+ * (depends on current case) seperated by a special character,
+ * works on EBCDIC
+ */
+ if (sclp_ioctls.delim)
+ count = sclp_switch_cases(start, count,
+ sclp_ioctls.delim,
+ sclp_ioctls.tolower);
+
+ /* convert EBCDIC to ASCII (modify original input in SCCB) */
+ sclp_ebcasc_str(start, count);
+
+ /* if set in ioctl write operators input to console */
+ if (sclp_ioctls.echo)
+ sclp_tty_write(sclp_tty, 0, start, count);
+
+ /* transfer input to high level driver */
+ sclp_tty_input(start, count);
+}
+
+static inline struct gds_vector *
+find_gds_vector(struct gds_vector *start, struct gds_vector *end, u16 id)
+{
+ struct gds_vector *vec;
+
+ for (vec = start; vec < end; (void *) vec += vec->length)
+ if (vec->gds_id == id)
+ return vec;
+ return NULL;
+}
+
+static inline struct gds_subvector *
+find_gds_subvector(struct gds_subvector *start,
+ struct gds_subvector *end, u8 key)
+{
+ struct gds_subvector *subvec;
+
+ for (subvec = start; subvec < end; (void *) subvec += subvec->length)
+ if (subvec->key == key)
+ return subvec;
+ return NULL;
+}
+
+static inline void
+sclp_eval_selfdeftextmsg(struct gds_subvector *start,
+ struct gds_subvector *end)
+{
+ struct gds_subvector *subvec;
+
+ subvec = start;
+ while (subvec < end) {
+ subvec = find_gds_subvector(subvec, end, 0x30);
+ if (!subvec)
+ break;
+ sclp_get_input((void *)(subvec + 1),
+ (void *) subvec + subvec->length);
+ (void *) subvec += subvec->length;
+ }
+}
+
+static inline void
+sclp_eval_textcmd(struct gds_subvector *start,
+ struct gds_subvector *end)
+{
+ struct gds_subvector *subvec;
+
+ subvec = start;
+ while (subvec < end) {
+ subvec = find_gds_subvector(subvec, end,
+ GDS_KEY_SelfDefTextMsg);
+ if (!subvec)
+ break;
+ sclp_eval_selfdeftextmsg((struct gds_subvector *)(subvec + 1),
+ (void *)subvec + subvec->length);
+ (void *) subvec += subvec->length;
+ }
+}
+
+static inline void
+sclp_eval_cpmsu(struct gds_vector *start, struct gds_vector *end)
+{
+ struct gds_vector *vec;
+
+ vec = start;
+ while (vec < end) {
+ vec = find_gds_vector(vec, end, GDS_ID_TextCmd);
+ if (!vec)
+ break;
+ sclp_eval_textcmd((struct gds_subvector *)(vec + 1),
+ (void *) vec + vec->length);
+ (void *) vec += vec->length;
+ }
+}
+
+
+static inline void
+sclp_eval_mdsmu(struct gds_vector *start, void *end)
+{
+ struct gds_vector *vec;
+
+ vec = find_gds_vector(start, end, GDS_ID_CPMSU);
+ if (vec)
+ sclp_eval_cpmsu(vec + 1, (void *) vec + vec->length);
+}
+
+static void
+sclp_tty_receiver(struct evbuf_header *evbuf)
+{
+ struct gds_vector *start, *end, *vec;
+
+ start = (struct gds_vector *)(evbuf + 1);
+ end = (void *) evbuf + evbuf->length;
+ vec = find_gds_vector(start, end, GDS_ID_MDSMU);
+ if (vec)
+ sclp_eval_mdsmu(vec + 1, (void *) vec + vec->length);
+}
+
+static void
+sclp_tty_state_change(struct sclp_register *reg)
+{
+}
+
+struct sclp_register sclp_input_event =
+{
+ .receive_mask = EvTyp_OpCmd_Mask | EvTyp_PMsgCmd_Mask,
+ .state_change_fn = sclp_tty_state_change,
+ .receiver_fn = sclp_tty_receiver
+};
+
+void
+sclp_tty_init(void)
+{
+ void *page;
+ int i;
+
+ if (!CONSOLE_IS_SCLP)
+ return;
+ if (sclp_rw_init() != 0)
+ return;
+ /* Allocate pages for output buffering */
+ INIT_LIST_HEAD(&sclp_tty_pages);
+ for (i = 0; i < MAX_KMEM_PAGES; i++) {
+ page = (void *) get_zeroed_page(GFP_KERNEL);
+ if (page == NULL)
+ return;
+ list_add_tail((struct list_head *) page, &sclp_tty_pages);
+ }
+ INIT_LIST_HEAD(&sclp_tty_outqueue);
+ spin_lock_init(&sclp_tty_lock);
+ init_waitqueue_head(&sclp_tty_waitq);
+ init_timer(&sclp_tty_timer);
+ sclp_ttybuf = NULL;
+ sclp_tty_buffer_count = 0;
+ if (MACHINE_IS_VM) {
+ /*
+ * save 4 characters for the CPU number
+ * written at start of each line by VM/CP
+ */
+ sclp_ioctls_init.columns = 76;
+ /* case input lines to lowercase */
+ sclp_ioctls_init.tolower = 1;
+ }
+ sclp_ioctls = sclp_ioctls_init;
+ sclp_tty_chars_count = 0;
+ sclp_tty = NULL;
+
+ if (sclp_register(&sclp_input_event) != 0)
+ return;
+
+ memset (&sclp_tty_driver, 0, sizeof(struct tty_driver));
+ sclp_tty_driver.magic = TTY_DRIVER_MAGIC;
+ sclp_tty_driver.driver_name = "tty_sclp";
+ sclp_tty_driver.name = "ttyS";
+ sclp_tty_driver.name_base = 0;
+ sclp_tty_driver.major = TTY_MAJOR;
+ sclp_tty_driver.minor_start = 64;
+ sclp_tty_driver.num = 1;
+ sclp_tty_driver.type = TTY_DRIVER_TYPE_SYSTEM;
+ sclp_tty_driver.subtype = SYSTEM_TYPE_TTY;
+ sclp_tty_driver.init_termios = tty_std_termios;
+ sclp_tty_driver.init_termios.c_iflag = IGNBRK | IGNPAR;
+ sclp_tty_driver.init_termios.c_oflag = ONLCR | XTABS;
+ sclp_tty_driver.init_termios.c_lflag = ISIG | ECHO;
+ sclp_tty_driver.flags = TTY_DRIVER_REAL_RAW;
+ sclp_tty_driver.refcount = &sclp_tty_refcount;
+ /* sclp_tty_driver.proc_entry ? */
+ sclp_tty_driver.table = sclp_tty_table;
+ sclp_tty_driver.termios = sclp_tty_termios;
+ sclp_tty_driver.termios_locked = sclp_tty_termios_locked;
+ sclp_tty_driver.open = sclp_tty_open;
+ sclp_tty_driver.close = sclp_tty_close;
+ sclp_tty_driver.write = sclp_tty_write;
+ sclp_tty_driver.put_char = sclp_tty_put_char;
+ sclp_tty_driver.flush_chars = sclp_tty_flush_chars;
+ sclp_tty_driver.write_room = sclp_tty_write_room;
+ sclp_tty_driver.chars_in_buffer = sclp_tty_chars_in_buffer;
+ sclp_tty_driver.flush_buffer = sclp_tty_flush_buffer;
+ sclp_tty_driver.ioctl = sclp_tty_ioctl;
+ /*
+ * No need for these function because they would be only called when
+ * the line discipline is close to full. That means that there must be
+ * collected nearly 4kB of input data. I suppose it is very difficult
+ * for the operator to enter lines quickly enough to let overrun the
+ * line discipline. Besides the n_tty line discipline does not try to
+ * call such functions if the pointers are set to NULL. Finally I have
+ * no idea what to do within these function. I can not prevent the
+ * operator and the SCLP to deliver input. Because of the reasons
+ * above it seems not worth to implement a buffer mechanism.
+ */
+ sclp_tty_driver.throttle = NULL;
+ sclp_tty_driver.unthrottle = NULL;
+ sclp_tty_driver.send_xchar = NULL;
+ sclp_tty_driver.set_termios = NULL;
+ sclp_tty_driver.set_ldisc = NULL;
+ sclp_tty_driver.stop = NULL;
+ sclp_tty_driver.start = NULL;
+ sclp_tty_driver.hangup = NULL;
+ sclp_tty_driver.break_ctl = NULL;
+ sclp_tty_driver.wait_until_sent = NULL;
+ sclp_tty_driver.read_proc = NULL;
+ sclp_tty_driver.write_proc = NULL;
+
+ if (tty_register_driver(&sclp_tty_driver))
+ panic("Couldn't register sclp_tty driver\n");
+}
diff -urN linux-2.5.48/drivers/s390/char/sclp_tty.h linux-2.5.48-s390/drivers/s390/char/sclp_tty.h
--- linux-2.5.48/drivers/s390/char/sclp_tty.h Thu Jan 1 01:00:00 1970
+++ linux-2.5.48-s390/drivers/s390/char/sclp_tty.h Mon Nov 18 20:14:52 2002
@@ -0,0 +1,67 @@
+/*
+ * drivers/s390/char/sclp_tty.h
+ * interface to the SCLP-read/write driver
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef __SCLP_TTY_H__
+#define __SCLP_TTY_H__
+
+#include <linux/ioctl.h>
+
+/* This is the type of data structures storing sclp ioctl setting. */
+struct sclp_ioctls {
+ unsigned short htab;
+ unsigned char echo;
+ unsigned short columns;
+ signed char final_nl;
+ unsigned short max_sccb;
+ unsigned short kmem_sccb; /* canīt be modified at run time */
+ unsigned char tolower;
+ unsigned char delim;
+};
+
+/* must be unique, FIXME: must be added in Documentation/ioctl_number.txt */
+#define SCLP_IOCTL_LETTER 'B'
+
+/* set width of horizontal tabulator */
+#define TIOCSCLPSHTAB _IOW(SCLP_IOCTL_LETTER, 0, unsigned short)
+/* enable/disable echo of input (independent from line discipline) */
+#define TIOCSCLPSECHO _IOW(SCLP_IOCTL_LETTER, 1, unsigned char)
+/* set number of colums for output */
+#define TIOCSCLPSCOLS _IOW(SCLP_IOCTL_LETTER, 2, unsigned short)
+/* enable/disable writing without final new line character */
+#define TIOCSCLPSNL _IOW(SCLP_IOCTL_LETTER, 4, signed char)
+/* set the maximum buffers size for output, rounded up to next 4kB boundary */
+#define TIOCSCLPSOBUF _IOW(SCLP_IOCTL_LETTER, 5, unsigned short)
+/* set initial (default) sclp ioctls */
+#define TIOCSCLPSINIT _IO(SCLP_IOCTL_LETTER, 6)
+/* enable/disable conversion from upper to lower case of input */
+#define TIOCSCLPSCASE _IOW(SCLP_IOCTL_LETTER, 7, unsigned char)
+/* set special character used for seperating upper and lower case, */
+/* 0x00 disables this feature */
+#define TIOCSCLPSDELIM _IOW(SCLP_IOCTL_LETTER, 9, unsigned char)
+
+/* get width of horizontal tabulator */
+#define TIOCSCLPGHTAB _IOR(SCLP_IOCTL_LETTER, 10, unsigned short)
+/* Is echo of input enabled ? (independent from line discipline) */
+#define TIOCSCLPGECHO _IOR(SCLP_IOCTL_LETTER, 11, unsigned char)
+/* get number of colums for output */
+#define TIOCSCLPGCOLS _IOR(SCLP_IOCTL_LETTER, 12, unsigned short)
+/* Is writing without final new line character enabled ? */
+#define TIOCSCLPGNL _IOR(SCLP_IOCTL_LETTER, 14, signed char)
+/* get the maximum buffers size for output */
+#define TIOCSCLPGOBUF _IOR(SCLP_IOCTL_LETTER, 15, unsigned short)
+/* Is conversion from upper to lower case of input enabled ? */
+#define TIOCSCLPGCASE _IOR(SCLP_IOCTL_LETTER, 17, unsigned char)
+/* get special character used for seperating upper and lower case, */
+/* 0x00 disables this feature */
+#define TIOCSCLPGDELIM _IOR(SCLP_IOCTL_LETTER, 19, unsigned char)
+/* get the number of buffers/pages got from kernel at startup */
+#define TIOCSCLPGKBUF _IOR(SCLP_IOCTL_LETTER, 20, unsigned short)
+
+#endif /* __SCLP_TTY_H__ */
-
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This archive was generated by hypermail 2b29 : Sat Nov 23 2002 - 22:00:24 EST