[PATCH -mm 1/4 -v6] x86_64 EFI runtime service support: EFI basicruntime service support

From: Huang, Ying
Date: Mon Nov 26 2007 - 03:24:17 EST

This patch adds basic runtime services support for EFI x86_64
system. The main file of the patch is the addition of efi_64.c for
x86_64. This file is modeled after the EFI IA32 avatar. EFI runtime
services initialization are implemented in efi_64.c. Some x86_64
specifics are worth noting here. On x86_64, parameters passed to EFI
firmware services need to follow the EFI calling convention. For this
purpose, a set of functions named efi_call<x> (<x> is the number of
parameters) are implemented. EFI function calls are wrapped before
calling the firmware service. The duplicated code between efi_32.c and
efi_64.c is placed in efi.c to remove them from efi_32.c.

Signed-off-by: Chandramouli Narayanan <mouli@xxxxxxxxxxxxxxx>
Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>

---
arch/x86/Kconfig | 2
arch/x86/kernel/Makefile_64 | 1
arch/x86/kernel/efi.c | 484 ++++++++++++++++++++++++++++++++++++++++++
arch/x86/kernel/efi_64.c | 171 ++++++++++++++
arch/x86/kernel/efi_stub_64.S | 68 +++++
arch/x86/kernel/setup_64.c | 17 +
include/asm-x86/bootparam.h | 5
include/asm-x86/efi.h | 70 ++++++
include/asm-x86/fixmap_64.h | 3
9 files changed, 817 insertions(+), 4 deletions(-)

--- /dev/null
+++ b/arch/x86/kernel/efi_64.c
@@ -0,0 +1,171 @@
+/*
+ * x86_64 specific EFI support functions
+ * Based on Extensible Firmware Interface Specification version 1.0
+ *
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@xxxxxxxxx>
+ * Bibo Mao <bibo.mao@xxxxxxxxx>
+ * Chandramouli Narayanan <mouli@xxxxxxxxxxxxxxx>
+ * Huang Ying <ying.huang@xxxxxxxxx>
+ *
+ * Code to convert EFI to E820 map has been implemented in elilo bootloader
+ * based on a EFI patch by Edgar Hucek. Based on the E820 map, the page table
+ * is setup appropriately for EFI runtime code.
+ * - mouli 06/14/2007.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/bootmem.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/efi.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/reboot.h>
+
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/e820.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/proto.h>
+#include <asm/efi.h>
+
+static pgd_t save_pgd __initdata;
+static unsigned long efi_flags __initdata;
+/* efi_lock protects efi physical mode call */
+static __initdata DEFINE_SPINLOCK(efi_lock);
+
+static int __init setup_noefi(char *arg)
+{
+ efi_enabled = 0;
+ return 0;
+}
+early_param("noefi", setup_noefi);
+
+static void __init early_mapping_set_exec(unsigned long start,
+ unsigned long end,
+ int executable)
+{
+ pte_t *kpte;
+
+ while (start < end) {
+ kpte = lookup_address((unsigned long)__va(start));
+ BUG_ON(!kpte);
+ if (executable)
+ set_pte(kpte, pte_mkexec(*kpte));
+ else
+ set_pte(kpte, __pte((pte_val(*kpte) | _PAGE_NX) & \
+ __supported_pte_mask));
+ if (pte_huge(*kpte))
+ start = (start + PMD_SIZE) & PMD_MASK;
+ else
+ start = (start + PAGE_SIZE) & PAGE_MASK;
+ }
+}
+
+static void __init early_runtime_code_mapping_set_exec(int executable)
+{
+ efi_memory_desc_t *md;
+ void *p;
+
+ /* Make EFI runtime service code area executable */
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
+ if (md->type == EFI_RUNTIME_SERVICES_CODE) {
+ unsigned long end;
+ end = md->phys_addr + (md->num_pages << PAGE_SHIFT);
+ early_mapping_set_exec(md->phys_addr, end, executable);
+ }
+ }
+}
+
+void __init efi_call_phys_prelog(void) __acquires(efi_lock)
+{
+ unsigned long vaddress;
+
+ /*
+ * Lock sequence is different from normal case because
+ * efi_flags is global
+ */
+ spin_lock(&efi_lock);
+ local_irq_save(efi_flags);
+ early_runtime_code_mapping_set_exec(1);
+ vaddress = (unsigned long)__va(0x0UL);
+ pgd_val(save_pgd) = pgd_val(*pgd_offset_k(0x0UL));
+ set_pgd(pgd_offset_k(0x0UL), *pgd_offset_k(vaddress));
+ global_flush_tlb();
+}
+
+void __init efi_call_phys_epilog(void) __releases(efi_lock)
+{
+ /*
+ * After the lock is released, the original page table is restored.
+ */
+ set_pgd(pgd_offset_k(0x0UL), save_pgd);
+ early_runtime_code_mapping_set_exec(0);
+ global_flush_tlb();
+ local_irq_restore(efi_flags);
+ spin_unlock(&efi_lock);
+}
+
+/*
+ * We need to map the EFI memory map again after init_memory_mapping().
+ */
+void __init efi_map_memmap(void)
+{
+ memmap.map = __va(memmap.phys_map);
+ memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
+}
+
+void __init efi_reserve_bootmem(void)
+{
+ reserve_bootmem_generic((unsigned long)memmap.phys_map,
+ memmap.nr_map * memmap.desc_size);
+}
+
+void __init runtime_code_page_mkexec(void)
+{
+ efi_memory_desc_t *md;
+ void *p;
+
+ /* Make EFI runtime service code area executable */
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
+ if (md->type == EFI_RUNTIME_SERVICES_CODE)
+ change_page_attr_addr(md->virt_addr,
+ md->num_pages,
+ PAGE_KERNEL_EXEC);
+ }
+ global_flush_tlb();
+}
+
+void __iomem * __init efi_ioremap(unsigned long offset,
+ unsigned long size)
+{
+ static unsigned pages_mapped;
+ unsigned long last_addr;
+ unsigned i, pages;
+
+ last_addr = offset + size - 1;
+ offset &= PAGE_MASK;
+ pages = (PAGE_ALIGN(last_addr) - offset) >> PAGE_SHIFT;
+ if (pages_mapped + pages > MAX_EFI_IO_PAGES)
+ return NULL;
+
+ for (i = 0; i < pages; i++) {
+ set_fixmap_nocache(FIX_EFI_IO_MAP_FIRST_PAGE - pages_mapped,
+ offset);
+ offset += PAGE_SIZE;
+ pages_mapped++;
+ }
+
+ return (void __iomem *)__fix_to_virt(FIX_EFI_IO_MAP_FIRST_PAGE - \
+ (pages_mapped - pages));
+}
--- /dev/null
+++ b/arch/x86/kernel/efi_stub_64.S
@@ -0,0 +1,68 @@
+/*
+ * Function calling ABI conversion from Linux to EFI for x86_64
+ *
+ * Copyright (C) 2007 Intel Corp
+ * Bibo Mao <bibo.mao@xxxxxxxxx>
+ * Huang Ying <ying.huang@xxxxxxxxx>
+ */
+
+#include <linux/linkage.h>
+
+ENTRY(efi_call0)
+ subq $40, %rsp
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(efi_call1)
+ subq $40, %rsp
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(efi_call2)
+ subq $40, %rsp
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(efi_call3)
+ subq $40, %rsp
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(efi_call4)
+ subq $40, %rsp
+ mov %r8, %r9
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(efi_call5)
+ subq $40, %rsp
+ mov %r9, 32(%rsp)
+ mov %r8, %r9
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $40, %rsp
+ ret
+
+ENTRY(efi_call6)
+ subq $56, %rsp
+ mov 56+8(%rsp), %rax
+ mov %r9, 32(%rsp)
+ mov %rax, 40(%rsp)
+ mov %r8, %r9
+ mov %rcx, %r8
+ mov %rsi, %rcx
+ call *%rdi
+ addq $56, %rsp
+ ret
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -39,6 +39,7 @@
#include <linux/dmi.h>
#include <linux/dma-mapping.h>
#include <linux/ctype.h>
+#include <linux/efi.h>

#include <asm/mtrr.h>
#include <asm/uaccess.h>
@@ -280,6 +281,11 @@ void __init setup_arch(char **cmdline_p)
rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
#endif
+#ifdef CONFIG_EFI
+ if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
+ "EL64", 4))
+ efi_enabled = 1;
+#endif
setup_memory_region();
copy_edd();

@@ -319,6 +325,8 @@ void __init setup_arch(char **cmdline_p)
discover_ebda();

init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
+ if (efi_enabled)
+ efi_init();

dmi_scan_machine();

@@ -390,6 +398,12 @@ void __init setup_arch(char **cmdline_p)
*/
acpi_reserve_bootmem();
#endif
+
+ if (efi_enabled) {
+ efi_map_memmap();
+ efi_reserve_bootmem();
+ }
+
/*
* Find and reserve possible boot-time SMP configuration:
*/
@@ -458,7 +472,8 @@ void __init setup_arch(char **cmdline_p)

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
- conswitchp = &vga_con;
+ if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
+ conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
--- a/include/asm-x86/fixmap_64.h
+++ b/include/asm-x86/fixmap_64.h
@@ -15,6 +15,7 @@
#include <asm/apicdef.h>
#include <asm/page.h>
#include <asm/vsyscall.h>
+#include <asm/efi.h>

/*
* Here we define all the compile-time 'special' virtual
@@ -41,6 +42,8 @@ enum fixed_addresses {
FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
FIX_IO_APIC_BASE_0,
FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
+ FIX_EFI_IO_MAP_LAST_PAGE,
+ FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE+MAX_EFI_IO_PAGES-1,
__end_of_fixed_addresses
};

--- a/arch/x86/kernel/Makefile_64
+++ b/arch/x86/kernel/Makefile_64
@@ -35,6 +35,7 @@ obj-$(CONFIG_X86_PM_TIMER) += pmtimer_64
obj-$(CONFIG_X86_VSMP) += vsmp_64.o
obj-$(CONFIG_K8_NB) += k8.o
obj-$(CONFIG_AUDIT) += audit_64.o
+obj-$(CONFIG_EFI) += efi.o efi_64.o efi_stub_64.o

obj-$(CONFIG_MODULES) += module_64.o
obj-$(CONFIG_PCI) += early-quirks.o
--- a/include/asm-x86/bootparam.h
+++ b/include/asm-x86/bootparam.h
@@ -54,13 +54,14 @@ struct sys_desc_table {
};

struct efi_info {
- __u32 _pad1;
+ __u32 efi_loader_signature;
__u32 efi_systab;
__u32 efi_memdesc_size;
__u32 efi_memdesc_version;
__u32 efi_memmap;
__u32 efi_memmap_size;
- __u32 _pad2[2];
+ __u32 efi_systab_hi;
+ __u32 efi_memmap_hi;
};

/* The so-called "zeropage" */
--- /dev/null
+++ b/arch/x86/kernel/efi.c
@@ -0,0 +1,484 @@
+/*
+ * Common EFI (Extensible Firmware Interface) support functions
+ * Based on Extensible Firmware Interface Specification version 1.0
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@xxxxxxxxxxx>
+ * Copyright (C) 1999-2002 Hewlett-Packard Co.
+ * David Mosberger-Tang <davidm@xxxxxxxxxx>
+ * Stephane Eranian <eranian@xxxxxxxxxx>
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@xxxxxxxxx>
+ * Bibo Mao <bibo.mao@xxxxxxxxx>
+ * Chandramouli Narayanan <mouli@xxxxxxxxxxxxxxx>
+ * Huang Ying <ying.huang@xxxxxxxxx>
+ *
+ * Copied from efi_32.c to eliminate the duplicated code between EFI
+ * 32/64 support code. --ying 2007-10-26
+ *
+ * All EFI Runtime Services are not implemented yet as EFI only
+ * supports physical mode addressing on SoftSDV. This is to be fixed
+ * in a future version. --drummond 1999-07-20
+ *
+ * Implemented EFI runtime services and virtual mode calls. --davidm
+ *
+ * Goutham Rao: <goutham.rao@xxxxxxxxx>
+ * Skip non-WB memory and ignore empty memory ranges.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/efi.h>
+#include <linux/bootmem.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/time.h>
+#include <linux/io.h>
+#include <linux/reboot.h>
+#include <linux/bcd.h>
+
+#include <asm/setup.h>
+#include <asm/efi.h>
+#include <asm/time.h>
+
+#define EFI_DEBUG 0
+
+int efi_enabled;
+EXPORT_SYMBOL(efi_enabled);
+
+struct efi efi;
+EXPORT_SYMBOL(efi);
+
+struct efi_memory_map memmap;
+
+struct efi efi_phys __initdata;
+static efi_system_table_t efi_systab __initdata;
+
+static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+{
+ return efi_call_virt2(get_time, tm, tc);
+}
+
+static efi_status_t virt_efi_set_time(efi_time_t *tm)
+{
+ return efi_call_virt1(set_time, tm);
+}
+
+static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
+ efi_bool_t *pending,
+ efi_time_t *tm)
+{
+ return efi_call_virt3(get_wakeup_time,
+ enabled, pending, tm);
+}
+
+static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+{
+ return efi_call_virt2(set_wakeup_time,
+ enabled, tm);
+}
+
+static efi_status_t virt_efi_get_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 *attr,
+ unsigned long *data_size,
+ void *data)
+{
+ return efi_call_virt5(get_variable,
+ name, vendor, attr,
+ data_size, data);
+}
+
+static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+{
+ return efi_call_virt3(get_next_variable,
+ name_size, name, vendor);
+}
+
+static efi_status_t virt_efi_set_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ unsigned long attr,
+ unsigned long data_size,
+ void *data)
+{
+ return efi_call_virt5(set_variable,
+ name, vendor, attr,
+ data_size, data);
+}
+
+static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
+{
+ return efi_call_virt1(get_next_high_mono_count, count);
+}
+
+static void virt_efi_reset_system(int reset_type,
+ efi_status_t status,
+ unsigned long data_size,
+ efi_char16_t *data)
+{
+ efi_call_virt4(reset_system, reset_type, status,
+ data_size, data);
+}
+
+static efi_status_t virt_efi_set_virtual_address_map(
+ unsigned long memory_map_size,
+ unsigned long descriptor_size,
+ u32 descriptor_version,
+ efi_memory_desc_t *virtual_map)
+{
+ return efi_call_virt4(set_virtual_address_map,
+ memory_map_size, descriptor_size,
+ descriptor_version, virtual_map);
+}
+
+static efi_status_t __init phys_efi_set_virtual_address_map(
+ unsigned long memory_map_size,
+ unsigned long descriptor_size,
+ u32 descriptor_version,
+ efi_memory_desc_t *virtual_map)
+{
+ efi_status_t status;
+
+ efi_call_phys_prelog();
+ status = efi_call_phys4(efi_phys.set_virtual_address_map,
+ memory_map_size, descriptor_size,
+ descriptor_version, virtual_map);
+ efi_call_phys_epilog();
+ return status;
+}
+
+static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
+ efi_time_cap_t *tc)
+{
+ efi_status_t status;
+
+ efi_call_phys_prelog();
+ status = efi_call_phys2(efi_phys.get_time, tm, tc);
+ efi_call_phys_epilog();
+ return status;
+}
+
+int efi_set_rtc_mmss(unsigned long nowtime)
+{
+ int real_seconds, real_minutes;
+ efi_status_t status;
+ efi_time_t eft;
+ efi_time_cap_t cap;
+
+ status = efi.get_time(&eft, &cap);
+ if (status != EFI_SUCCESS) {
+ printk(KERN_ERR "Oops: efitime: can't read time!\n");
+ return -1;
+ }
+
+ real_seconds = nowtime % 60;
+ real_minutes = nowtime / 60;
+ if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
+ real_minutes += 30;
+ real_minutes %= 60;
+ eft.minute = real_minutes;
+ eft.second = real_seconds;
+
+ status = efi.set_time(&eft);
+ if (status != EFI_SUCCESS) {
+ printk(KERN_ERR "Oops: efitime: can't write time!\n");
+ return -1;
+ }
+ return 0;
+}
+
+unsigned long efi_get_time(void)
+{
+ efi_status_t status;
+ efi_time_t eft;
+ efi_time_cap_t cap;
+
+ status = efi.get_time(&eft, &cap);
+ if (status != EFI_SUCCESS)
+ printk(KERN_ERR "Oops: efitime: can't read time!\n");
+
+ return mktime(eft.year, eft.month, eft.day, eft.hour,
+ eft.minute, eft.second);
+}
+
+#if EFI_DEBUG
+static void __init print_efi_memmap(void)
+{
+ efi_memory_desc_t *md;
+ void *p;
+ int i;
+
+ for (p = memmap.map, i = 0;
+ p < memmap.map_end;
+ p += memmap.desc_size, i++) {
+ md = p;
+ printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, "
+ "range=[0x%016llx-0x%016llx) (%lluMB)\n",
+ i, md->type, md->attribute, md->phys_addr,
+ md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
+ (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
+ }
+}
+#endif /* EFI_DEBUG */
+
+void __init efi_init(void)
+{
+ efi_config_table_t *config_tables;
+ efi_runtime_services_t *runtime;
+ efi_char16_t *c16;
+ char vendor[100] = "unknown";
+ int i = 0;
+ void *tmp;
+
+ memset(&efi, 0, sizeof(efi));
+ memset(&efi_phys, 0, sizeof(efi_phys));
+
+#ifdef CONFIG_X86_32
+ efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
+ memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
+#else
+ efi_phys.systab = (efi_system_table_t *)
+ (boot_params.efi_info.efi_systab |
+ ((__u64)boot_params.efi_info.efi_systab_hi<<32));
+ memmap.phys_map = (void *)
+ (boot_params.efi_info.efi_memmap |
+ ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
+#endif
+ memmap.nr_map = boot_params.efi_info.efi_memmap_size /
+ boot_params.efi_info.efi_memdesc_size;
+ memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
+ memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
+
+ efi.systab = efi_early_ioremap((unsigned long)efi_phys.systab,
+ sizeof(efi_system_table_t));
+ if (efi.systab == NULL)
+ printk(KERN_ERR "Woah! Couldn't map the EFI systema table.\n");
+ memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
+ efi_early_iounmap(efi.systab, sizeof(efi_system_table_t));
+ efi.systab = &efi_systab;
+
+ /*
+ * Verify the EFI Table
+ */
+ if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
+ printk(KERN_ERR "Woah! EFI system table "
+ "signature incorrect\n");
+ if ((efi.systab->hdr.revision >> 16) == 0)
+ printk(KERN_ERR "Warning: EFI system table version "
+ "%d.%02d, expected 1.00 or greater\n",
+ efi.systab->hdr.revision >> 16,
+ efi.systab->hdr.revision & 0xffff);
+
+ /*
+ * Show what we know for posterity
+ */
+ c16 = tmp = efi_early_ioremap(efi.systab->fw_vendor, 2);
+ if (c16) {
+ for (i = 0; i < sizeof(vendor) && *c16; ++i)
+ vendor[i] = *c16++;
+ vendor[i] = '\0';
+ } else
+ printk(KERN_ERR "Could not map the firmware vendor!\n");
+ efi_early_iounmap(tmp, 2);
+
+ printk(KERN_INFO "EFI v%u.%.02u by %s \n",
+ efi.systab->hdr.revision >> 16,
+ efi.systab->hdr.revision & 0xffff, vendor);
+
+ /*
+ * Let's see what config tables the firmware passed to us.
+ */
+ config_tables = efi_early_ioremap(
+ efi.systab->tables,
+ efi.systab->nr_tables * sizeof(efi_config_table_t));
+ if (config_tables == NULL)
+ printk(KERN_ERR "Could not map EFI Configuration Table!\n");
+
+ printk(KERN_INFO);
+ for (i = 0; i < efi.systab->nr_tables; i++) {
+ if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
+ efi.mps = config_tables[i].table;
+ printk(" MPS=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ ACPI_20_TABLE_GUID)) {
+ efi.acpi20 = config_tables[i].table;
+ printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ ACPI_TABLE_GUID)) {
+ efi.acpi = config_tables[i].table;
+ printk(" ACPI=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ SMBIOS_TABLE_GUID)) {
+ efi.smbios = config_tables[i].table;
+ printk(" SMBIOS=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ HCDP_TABLE_GUID)) {
+ efi.hcdp = config_tables[i].table;
+ printk(" HCDP=0x%lx ", config_tables[i].table);
+ } else if (!efi_guidcmp(config_tables[i].guid,
+ UGA_IO_PROTOCOL_GUID)) {
+ efi.uga = config_tables[i].table;
+ printk(" UGA=0x%lx ", config_tables[i].table);
+ }
+ }
+ printk("\n");
+ efi_early_iounmap(config_tables,
+ efi.systab->nr_tables * sizeof(efi_config_table_t));
+
+ /*
+ * Check out the runtime services table. We need to map
+ * the runtime services table so that we can grab the physical
+ * address of several of the EFI runtime functions, needed to
+ * set the firmware into virtual mode.
+ */
+ runtime = efi_early_ioremap((unsigned long)efi.systab->runtime,
+ sizeof(efi_runtime_services_t));
+ if (runtime != NULL) {
+ /*
+ * We will only need *early* access to the following
+ * two EFI runtime services before set_virtual_address_map
+ * is invoked.
+ */
+ efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
+ efi_phys.set_virtual_address_map =
+ (efi_set_virtual_address_map_t *)
+ runtime->set_virtual_address_map;
+ /*
+ * Make efi_get_time can be called before entering
+ * virtual mode.
+ */
+ efi.get_time = phys_efi_get_time;
+ } else
+ printk(KERN_ERR "Could not map the EFI runtime service "
+ "table!\n");
+ efi_early_iounmap(runtime, sizeof(efi_runtime_services_t));
+
+ /* Map the EFI memory map */
+ memmap.map = efi_early_ioremap((unsigned long)memmap.phys_map,
+ memmap.nr_map * memmap.desc_size);
+ if (memmap.map == NULL)
+ printk(KERN_ERR "Could not map the EFI memory map!\n");
+ memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
+ if (memmap.desc_size != sizeof(efi_memory_desc_t))
+ printk(KERN_WARNING "Kernel-defined memdesc"
+ "doesn't match the one from EFI!\n");
+
+#ifdef CONFIG_X86_64
+ /* Setup for EFI runtime service */
+ reboot_type = BOOT_EFI;
+
+#endif
+#if EFI_DEBUG
+ print_efi_memmap();
+#endif
+}
+
+/*
+ * This function will switch the EFI runtime services to virtual mode.
+ * Essentially, look through the EFI memmap and map every region that
+ * has the runtime attribute bit set in its memory descriptor and update
+ * that memory descriptor with the virtual address obtained from ioremap().
+ * This enables the runtime services to be called without having to
+ * thunk back into physical mode for every invocation.
+ */
+void __init efi_enter_virtual_mode(void)
+{
+ efi_memory_desc_t *md;
+ efi_status_t status;
+ unsigned long end;
+ void *p;
+
+ efi.systab = NULL;
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
+ if (!(md->attribute & EFI_MEMORY_RUNTIME))
+ continue;
+ if ((md->attribute & EFI_MEMORY_WB) &&
+ (((md->phys_addr + (md->num_pages<<EFI_PAGE_SHIFT)) >>
+ PAGE_SHIFT) < end_pfn_map))
+ md->virt_addr = (unsigned long)__va(md->phys_addr);
+ else
+ md->virt_addr = (unsigned long)
+ efi_ioremap(md->phys_addr,
+ md->num_pages << EFI_PAGE_SHIFT);
+ if (!md->virt_addr)
+ printk(KERN_ERR "ioremap of 0x%llX failed!\n",
+ (unsigned long long)md->phys_addr);
+ end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
+ if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
+ ((unsigned long)efi_phys.systab < end))
+ efi.systab = (efi_system_table_t *)(unsigned long)
+ (md->virt_addr - md->phys_addr +
+ (unsigned long)efi_phys.systab);
+ }
+
+ BUG_ON(!efi.systab);
+
+ status = phys_efi_set_virtual_address_map(
+ memmap.desc_size * memmap.nr_map,
+ memmap.desc_size,
+ memmap.desc_version,
+ memmap.phys_map);
+
+ if (status != EFI_SUCCESS) {
+ printk(KERN_ALERT "You are screwed! "
+ "Unable to switch EFI into virtual mode "
+ "(status=%lx)\n", status);
+ panic("EFI call to SetVirtualAddressMap() failed!");
+ }
+
+ /*
+ * Now that EFI is in virtual mode, update the function
+ * pointers in the runtime service table to the new virtual addresses.
+ *
+ * Call EFI services through wrapper functions.
+ */
+ efi.get_time = virt_efi_get_time;
+ efi.set_time = virt_efi_set_time;
+ efi.get_wakeup_time = virt_efi_get_wakeup_time;
+ efi.set_wakeup_time = virt_efi_set_wakeup_time;
+ efi.get_variable = virt_efi_get_variable;
+ efi.get_next_variable = virt_efi_get_next_variable;
+ efi.set_variable = virt_efi_set_variable;
+ efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
+ efi.reset_system = virt_efi_reset_system;
+ efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
+#ifdef CONFIG_X86_64
+ runtime_code_page_mkexec();
+#endif
+}
+
+/*
+ * Convenience functions to obtain memory types and attributes
+ */
+u32 efi_mem_type(unsigned long phys_addr)
+{
+ efi_memory_desc_t *md;
+ void *p;
+
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
+ if ((md->phys_addr <= phys_addr) &&
+ (phys_addr < (md->phys_addr +
+ (md->num_pages << EFI_PAGE_SHIFT))))
+ return md->type;
+ }
+ return 0;
+}
+
+u64 efi_mem_attributes(unsigned long phys_addr)
+{
+ efi_memory_desc_t *md;
+ void *p;
+
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
+ if ((md->phys_addr <= phys_addr) &&
+ (phys_addr < (md->phys_addr +
+ (md->num_pages << EFI_PAGE_SHIFT))))
+ return md->attribute;
+ }
+ return 0;
+}
--- /dev/null
+++ b/include/asm-x86/efi.h
@@ -0,0 +1,70 @@
+#ifndef _ASM_X86_EFI_H
+#define _ASM_X86_EFI_H
+
+#ifdef CONFIG_X86_32
+#else /* !CONFIG_X86_32 */
+
+#define MAX_EFI_IO_PAGES 100
+
+extern u64 efi_call0(void *fp);
+extern u64 efi_call1(void *fp, u64 arg1);
+extern u64 efi_call2(void *fp, u64 arg1, u64 arg2);
+extern u64 efi_call3(void *fp, u64 arg1, u64 arg2, u64 arg3);
+extern u64 efi_call4(void *fp, u64 arg1, u64 arg2, u64 arg3, u64 arg4);
+extern u64 efi_call5(void *fp, u64 arg1, u64 arg2, u64 arg3,
+ u64 arg4, u64 arg5);
+extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
+ u64 arg4, u64 arg5, u64 arg6);
+
+#define efi_call_phys0(f) \
+ efi_call0((void *)(f))
+#define efi_call_phys1(f, a1) \
+ efi_call1((void *)(f), (u64)(a1))
+#define efi_call_phys2(f, a1, a2) \
+ efi_call2((void *)(f), (u64)(a1), (u64)(a2))
+#define efi_call_phys3(f, a1, a2, a3) \
+ efi_call3((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3))
+#define efi_call_phys4(f, a1, a2, a3, a4) \
+ efi_call4((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3), \
+ (u64)(a4))
+#define efi_call_phys5(f, a1, a2, a3, a4, a5) \
+ efi_call5((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3), \
+ (u64)(a4), (u64)(a5))
+#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6) \
+ efi_call6((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3), \
+ (u64)(a4), (u64)(a5), (u64)(a6))
+
+#define efi_call_virt0(f) \
+ efi_call0((void *)(efi.systab->runtime->f))
+#define efi_call_virt1(f, a1) \
+ efi_call1((void *)(efi.systab->runtime->f), (u64)(a1))
+#define efi_call_virt2(f, a1, a2) \
+ efi_call2((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2))
+#define efi_call_virt3(f, a1, a2, a3) \
+ efi_call3((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
+ (u64)(a3))
+#define efi_call_virt4(f, a1, a2, a3, a4) \
+ efi_call4((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
+ (u64)(a3), (u64)(a4))
+#define efi_call_virt5(f, a1, a2, a3, a4, a5) \
+ efi_call5((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
+ (u64)(a3), (u64)(a4), (u64)(a5))
+#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \
+ efi_call6((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
+ (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
+
+#define efi_early_ioremap(addr, size) early_ioremap(addr, size)
+#define efi_early_iounmap(vaddr, size) early_iounmap(vaddr, size)
+
+extern void *efi_ioremap(unsigned long offset, unsigned long size);
+
+extern int efi_time;
+
+#endif /* CONFIG_X86_32 */
+
+extern void efi_reserve_bootmem(void);
+extern void efi_call_phys_prelog(void);
+extern void efi_call_phys_epilog(void);
+extern void runtime_code_page_mkexec(void);
+
+#endif
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1016,7 +1016,7 @@ config MTRR

config EFI
bool "Boot from EFI support"
- depends on X86_32 && ACPI
+ depends on ACPI
default n
---help---
This enables the kernel to boot on EFI platforms using
-
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