[PATCH 2/4] x86: Add UV bios call infrastructure
From: Russ Anderson
Date: Mon Sep 22 2008 - 17:09:40 EST
[PATCH 2/4] Add UV bios call infrastructure
Add the EFI callback function and associated wrapper code.
Initialize SAL system table entry info at boot time.
Signed-off-by: Russ Anderson <rja@xxxxxxx>
Signed-off-by: Paul Jackson <pj@xxxxxxx>
---
arch/x86/kernel/bios_uv.c | 106 +++++++++++++++++++++++++++++++--------
arch/x86/kernel/genx2apic_uv_x.c | 1
include/asm-x86/uv/bios.h | 58 +++++++++++----------
3 files changed, 117 insertions(+), 48 deletions(-)
Index: linux/arch/x86/kernel/bios_uv.c
===================================================================
--- linux.orig/arch/x86/kernel/bios_uv.c 2008-09-22 16:01:00.000000000 -0500
+++ linux/arch/x86/kernel/bios_uv.c 2008-09-22 16:01:11.000000000 -0500
@@ -1,8 +1,6 @@
/*
* BIOS run time interface routines.
*
- * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
- *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -16,33 +14,99 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) Russ Anderson
*/
+#include <linux/efi.h>
+#include <linux/io.h>
#include <asm/uv/bios.h>
-const char *
-x86_bios_strerror(long status)
+struct sal_systab sal_systab;
+
+s64 uv_bios_call(int which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
{
- const char *str;
- switch (status) {
- case 0: str = "Call completed without error"; break;
- case -1: str = "Not implemented"; break;
- case -2: str = "Invalid argument"; break;
- case -3: str = "Call completed with error"; break;
- default: str = "Unknown BIOS status code"; break;
- }
- return str;
+ struct sal_systab *tab = &sal_systab;
+
+ if (tab->function == (unsigned long)NULL)
+ /*
+ * BIOS does not support SAL systab
+ */
+ return BIOS_STATUS_UNIMPLEMENTED;
+
+ return efi_call6((void *)__va(tab->function),
+ which, a1, a2, a3, a4, a5);
}
-long
-x86_bios_freq_base(unsigned long which, unsigned long *ticks_per_second,
- unsigned long *drift_info)
+s64 uv_bios_call_irqsave(int which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
{
- struct uv_bios_retval isrv;
+ unsigned long bios_flags;
+ s64 ret;
- BIOS_CALL(isrv, BIOS_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
- *ticks_per_second = isrv.v0;
- *drift_info = isrv.v1;
- return isrv.status;
+ local_irq_save(bios_flags);
+ ret = uv_bios_call(which, a1, a2, a3, a4, a5);
+ local_irq_restore(bios_flags);
+
+ return ret;
+}
+
+s64 uv_bios_call_reentrant(int which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
+{
+ s64 ret;
+
+ preempt_disable();
+ ret = uv_bios_call(which, a1, a2, a3, a4, a5);
+ preempt_enable();
+
+ return ret;
+}
+
+long
+x86_bios_freq_base(unsigned long clock_type, unsigned long *ticks_per_second,
+ unsigned long *drift_info)
+{
+ return uv_bios_call(BIOS_FREQ_BASE, clock_type,
+ (u64)ticks_per_second, 0, 0, 0);
}
EXPORT_SYMBOL_GPL(x86_bios_freq_base);
+
+
+#ifdef CONFIG_EFI
+void uv_bios_init(void)
+{
+ struct sal_systab *tab;
+
+ if ((efi.sal_systab == EFI_INVALID_TABLE_ADDR) ||
+ (efi.sal_systab == (unsigned long)NULL)) {
+ printk(KERN_CRIT "No EFI SAL System Table.\n");
+ sal_systab.function = (unsigned long)NULL;
+ return;
+ }
+
+ tab = (struct sal_systab *)ioremap(efi.sal_systab,
+ sizeof(struct sal_systab));
+ if (strncmp(tab->signature, "SST_", 4) != 0)
+ printk(KERN_ERR "bad signature in SAL system table!");
+
+ /*
+ * Copy table to permanent spot for later use.
+ */
+ memcpy(&sal_systab, tab, sizeof(struct sal_systab));
+ iounmap(tab);
+
+ printk(KERN_INFO "EFI SAL System Table Revision %d\n", tab->revision);
+}
+#else /* !CONFIG_EFI */
+/*
+ * IF EFI is not configured, have the EFI calls return unimplemented.
+ */
+u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
+ u64 arg4, u64 arg5, u64 arg6)
+{
+ return BIOS_STATUS_UNIMPLEMENTED;
+}
+
+void uv_bios_init(void) { }
+#endif
+
Index: linux/arch/x86/kernel/genx2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/genx2apic_uv_x.c 2008-09-22 16:01:00.000000000 -0500
+++ linux/arch/x86/kernel/genx2apic_uv_x.c 2008-09-22 16:01:11.000000000 -0500
@@ -413,6 +413,7 @@ void __init uv_system_init(void)
gnode_upper = (((unsigned long)node_id.s.node_id) &
~((1 << n_val) - 1)) << m_val;
+ uv_bios_init();
uv_rtc_init();
for_each_present_cpu(cpu) {
Index: linux/include/asm-x86/uv/bios.h
===================================================================
--- linux.orig/include/asm-x86/uv/bios.h 2008-09-22 16:01:00.000000000 -0500
+++ linux/include/asm-x86/uv/bios.h 2008-09-22 16:01:11.000000000 -0500
@@ -2,9 +2,7 @@
#define ASM_X86__UV__BIOS_H
/*
- * BIOS layer definitions.
- *
- * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
+ * UV BIOS layer definitions.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -19,6 +17,9 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) Russ Anderson
*/
#include <linux/rtc.h>
@@ -31,38 +32,41 @@ enum {
BIOS_FREQ_BASE_REALTIME_CLOCK = 2
};
-# define BIOS_CALL(result, a0, a1, a2, a3, a4, a5, a6, a7) \
- do { \
- /* XXX - the real call goes here */ \
- result.status = BIOS_STATUS_UNIMPLEMENTED; \
- isrv.v0 = 0; \
- isrv.v1 = 0; \
- } while (0)
-
+/*
+ * Status values returned from a BIOS call.
+ */
enum {
BIOS_STATUS_SUCCESS = 0,
- BIOS_STATUS_UNIMPLEMENTED = -1,
- BIOS_STATUS_EINVAL = -2,
- BIOS_STATUS_ERROR = -3
+ BIOS_STATUS_UNIMPLEMENTED = -ENOSYS,
+ BIOS_STATUS_EINVAL = -EINVAL,
+ BIOS_STATUS_UNAVAIL = -EBUSY
};
-struct uv_bios_retval {
- /*
- * A zero status value indicates call completed without error.
- * A negative status value indicates reason of call failure.
- * A positive status value indicates success but an
- * informational value should be printed (e.g., "reboot for
- * change to take effect").
- */
- s64 status;
- u64 v0;
- u64 v1;
- u64 v2;
+/*
+ * The SAL system table describes specific firmware
+ * capabilities available to the Linux kernel at runtime.
+ */
+struct sal_systab {
+ char signature[4]; /* must be "SST_" */
+ u32 revision; /* distinguish different firmware revs */
+ u64 function; /* BIOS runtime callback function ptr */
};
+/*
+ * bios calls have 6 parameters
+ */
+extern s64 uv_bios_call(int, u64, u64, u64, u64, u64);
+extern s64 uv_bios_call_irqsave(int, u64, u64, u64, u64, u64);
+extern s64 uv_bios_call_reentrant(int which, u64, u64, u64, u64, u64);
+
+extern void uv_bios_init(void);
+
extern long
x86_bios_freq_base(unsigned long which, unsigned long *ticks_per_second,
unsigned long *drift_info);
-extern const char *x86_bios_strerror(long status);
+
+#ifndef CONFIG_EFI
+extern u64 efi_call6(void *, u64, u64, u64, u64, u64, u64);
+#endif
#endif /* ASM_X86__UV__BIOS_H */
--
Russ Anderson, OS RAS/Partitioning Project Lead
SGI - Silicon Graphics Inc rja@xxxxxxx
--
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