[PATCH 1/4 -v5] x86_64 EFI runtime service support: EFI basic runtime service support
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 ( 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 <[EMAIL PROTECTED]>
Signed-off-by: Huang Ying <[EMAIL PROTECTED]>
---
arch/x86/kernel/Makefile_64 |1
arch/x86/kernel/efi.c | 483 ++
arch/x86/kernel/efi_64.c | 181 +++
arch/x86/kernel/efi_stub_64.S | 68 +
arch/x86/kernel/setup_64.c| 17 +
arch/x86_64/Kconfig | 11
include/asm-x86/bootparam.h |5
include/asm-x86/efi.h | 70 ++
include/asm-x86/fixmap_64.h |3
9 files changed, 836 insertions(+), 3 deletions(-)
Index: linux-2.6.24-rc1/arch/x86/kernel/efi_64.c
===
--- /dev/null 1970-01-01 00:00:00.0 +
+++ linux-2.6.24-rc1/arch/x86/kernel/efi_64.c 2007-10-30 10:07:57.0
+0800
@@ -0,0 +1,181 @@
+/*
+ * x86_64 specific EFI support functions
+ * Based on Extensible Firmware Interface Specification version 1.0
+ *
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <[EMAIL PROTECTED]>
+ * Bibo Mao <[EMAIL PROTECTED]>
+ * Chandramouli Narayanan <[EMAIL PROTECTED]>
+ * Huang Ying <[EMAIL PROTECTED]>
+ *
+ * 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
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+int efi_time __initdata;
+
+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 int __init setup_efi_time(char *arg)
+{
+ if (arg && !strcmp("on", arg))
+ efi_time = 1;
+ return 0;
+}
+early_param("efi_time", setup_efi_time);
+
+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(_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);
+
[PATCH 1/4 -v5] x86_64 EFI runtime service support: EFI basic runtime service support
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_callx (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 [EMAIL PROTECTED]
Signed-off-by: Huang Ying [EMAIL PROTECTED]
---
arch/x86/kernel/Makefile_64 |1
arch/x86/kernel/efi.c | 483 ++
arch/x86/kernel/efi_64.c | 181 +++
arch/x86/kernel/efi_stub_64.S | 68 +
arch/x86/kernel/setup_64.c| 17 +
arch/x86_64/Kconfig | 11
include/asm-x86/bootparam.h |5
include/asm-x86/efi.h | 70 ++
include/asm-x86/fixmap_64.h |3
9 files changed, 836 insertions(+), 3 deletions(-)
Index: linux-2.6.24-rc1/arch/x86/kernel/efi_64.c
===
--- /dev/null 1970-01-01 00:00:00.0 +
+++ linux-2.6.24-rc1/arch/x86/kernel/efi_64.c 2007-10-30 10:07:57.0
+0800
@@ -0,0 +1,181 @@
+/*
+ * x86_64 specific EFI support functions
+ * Based on Extensible Firmware Interface Specification version 1.0
+ *
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu [EMAIL PROTECTED]
+ * Bibo Mao [EMAIL PROTECTED]
+ * Chandramouli Narayanan [EMAIL PROTECTED]
+ * Huang Ying [EMAIL PROTECTED]
+ *
+ * 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
+
+int efi_time __initdata;
+
+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 int __init setup_efi_time(char *arg)
+{
+ if (arg !strcmp(on, arg))
+ efi_time = 1;
+ return 0;
+}
+early_param(efi_time, setup_efi_time);
+
+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)
