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Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/efi.h1
-rw-r--r--arch/x86/kernel/reboot.c2
-rw-r--r--arch/x86/kernel/setup.c23
-rw-r--r--arch/x86/platform/efi/efi.c36
4 files changed, 46 insertions, 16 deletions
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 7093e4a6a0b..035cd819ed4 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -90,6 +90,7 @@ extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
#endif /* CONFIG_X86_32 */
extern int add_efi_memmap;
+extern unsigned long x86_efi_facility;
extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
extern void efi_memblock_x86_reserve_range(void);
extern void efi_call_phys_prelog(void);
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index e61f79c97f1..47f4e5ff55a 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -603,7 +603,7 @@ static void native_machine_emergency_restart(void)
break;
case BOOT_EFI:
- if (efi_enabled)
+ if (efi_enabled(EFI_RUNTIME_SERVICES))
efi.reset_system(reboot_mode ?
EFI_RESET_WARM :
EFI_RESET_COLD,
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 0d403aaf0b3..58d73237725 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -750,15 +750,16 @@ void __init setup_arch(char **cmdline_p)
#endif
#ifdef CONFIG_EFI
if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
-#ifdef CONFIG_X86_32
- "EL32",
-#else
- "EL64",
-#endif
- 4)) {
- efi_enabled = 1;
- efi_memblock_x86_reserve_range();
+ "EL32", 4)) {
+ set_bit(EFI_BOOT, &x86_efi_facility);
+ } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
+ "EL64", 4)) {
+ set_bit(EFI_BOOT, &x86_efi_facility);
+ set_bit(EFI_64BIT, &x86_efi_facility);
}
+
+ if (efi_enabled(EFI_BOOT))
+ efi_memblock_x86_reserve_range();
#endif
x86_init.oem.arch_setup();
@@ -831,7 +832,7 @@ void __init setup_arch(char **cmdline_p)
finish_e820_parsing();
- if (efi_enabled)
+ if (efi_enabled(EFI_BOOT))
efi_init();
dmi_scan_machine();
@@ -914,7 +915,7 @@ void __init setup_arch(char **cmdline_p)
* The EFI specification says that boot service code won't be called
* after ExitBootServices(). This is, in fact, a lie.
*/
- if (efi_enabled)
+ if (efi_enabled(EFI_MEMMAP))
efi_reserve_boot_services();
/* preallocate 4k for mptable mpc */
@@ -1048,7 +1049,7 @@ void __init setup_arch(char **cmdline_p)
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
- if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
+ if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 4d320b290ce..ace36945f56 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -49,9 +49,6 @@
#define EFI_DEBUG 1
#define PFX "EFI: "
-int efi_enabled;
-EXPORT_SYMBOL(efi_enabled);
-
struct efi __read_mostly efi = {
.mps = EFI_INVALID_TABLE_ADDR,
.acpi = EFI_INVALID_TABLE_ADDR,
@@ -70,9 +67,25 @@ struct efi_memory_map memmap;
static struct efi efi_phys __initdata;
static efi_system_table_t efi_systab __initdata;
+static inline bool efi_is_native(void)
+{
+ return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
+}
+
+unsigned long x86_efi_facility;
+
+/*
+ * Returns 1 if 'facility' is enabled, 0 otherwise.
+ */
+int efi_enabled(int facility)
+{
+ return test_bit(facility, &x86_efi_facility) != 0;
+}
+EXPORT_SYMBOL(efi_enabled);
+
static int __init setup_noefi(char *arg)
{
- efi_enabled = 0;
+ clear_bit(EFI_BOOT, &x86_efi_facility);
return 0;
}
early_param("noefi", setup_noefi);
@@ -440,6 +453,9 @@ void __init efi_init(void)
int i = 0;
void *tmp;
+ if (!efi_is_native())
+ return;
+
#ifdef CONFIG_X86_32
efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
#else
@@ -467,6 +483,8 @@ void __init efi_init(void)
efi.systab->hdr.revision >> 16,
efi.systab->hdr.revision & 0xffff);
+ set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
+
/*
* Show what we know for posterity
*/
@@ -529,6 +547,8 @@ void __init efi_init(void)
early_iounmap(config_tables,
efi.systab->nr_tables * sizeof(efi_config_table_t));
+ set_bit(EFI_CONFIG_TABLES, &x86_efi_facility);
+
/*
* Check out the runtime services table. We need to map
* the runtime services table so that we can grab the physical
@@ -552,6 +572,8 @@ void __init efi_init(void)
* virtual mode.
*/
efi.get_time = phys_efi_get_time;
+
+ set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
} else
printk(KERN_ERR "Could not map the EFI runtime service "
"table!\n");
@@ -571,6 +593,8 @@ void __init efi_init(void)
if (add_efi_memmap)
do_add_efi_memmap();
+ set_bit(EFI_MEMMAP, &x86_efi_facility);
+
#ifdef CONFIG_X86_32
x86_platform.get_wallclock = efi_get_time;
x86_platform.set_wallclock = efi_set_rtc_mmss;
@@ -747,6 +771,7 @@ void __init efi_enter_virtual_mode(void)
efi.query_capsule_caps = virt_efi_query_capsule_caps;
if (__supported_pte_mask & _PAGE_NX)
runtime_code_page_mkexec();
+ clear_bit(EFI_MEMMAP, &x86_efi_facility);
early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
memmap.map = NULL;
kfree(new_memmap);
@@ -760,6 +785,9 @@ u32 efi_mem_type(unsigned long phys_addr)
efi_memory_desc_t *md;
void *p;
+ if (!efi_enabled(EFI_MEMMAP))
+ return 0;
+
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
if ((md->phys_addr <= phys_addr) &&
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2025-08-20 07:17:55 +0000