253 lines
6.9 KiB
C
253 lines
6.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_EFI_H
|
|
#define _ASM_X86_EFI_H
|
|
|
|
#include <asm/fpu/api.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/processor-flags.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/nospec-branch.h>
|
|
#include <asm/mmu_context.h>
|
|
|
|
/*
|
|
* We map the EFI regions needed for runtime services non-contiguously,
|
|
* with preserved alignment on virtual addresses starting from -4G down
|
|
* for a total max space of 64G. This way, we provide for stable runtime
|
|
* services addresses across kernels so that a kexec'd kernel can still
|
|
* use them.
|
|
*
|
|
* This is the main reason why we're doing stable VA mappings for RT
|
|
* services.
|
|
*
|
|
* This flag is used in conjuction with a chicken bit called
|
|
* "efi=old_map" which can be used as a fallback to the old runtime
|
|
* services mapping method in case there's some b0rkage with a
|
|
* particular EFI implementation (haha, it is hard to hold up the
|
|
* sarcasm here...).
|
|
*/
|
|
#define EFI_OLD_MEMMAP EFI_ARCH_1
|
|
|
|
#define EFI32_LOADER_SIGNATURE "EL32"
|
|
#define EFI64_LOADER_SIGNATURE "EL64"
|
|
|
|
#define MAX_CMDLINE_ADDRESS UINT_MAX
|
|
|
|
#define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
|
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
extern asmlinkage unsigned long efi_call_phys(void *, ...);
|
|
|
|
#define arch_efi_call_virt_setup() \
|
|
({ \
|
|
kernel_fpu_begin(); \
|
|
firmware_restrict_branch_speculation_start(); \
|
|
})
|
|
|
|
#define arch_efi_call_virt_teardown() \
|
|
({ \
|
|
firmware_restrict_branch_speculation_end(); \
|
|
kernel_fpu_end(); \
|
|
})
|
|
|
|
|
|
/*
|
|
* Wrap all the virtual calls in a way that forces the parameters on the stack.
|
|
*/
|
|
#define arch_efi_call_virt(p, f, args...) \
|
|
({ \
|
|
((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \
|
|
})
|
|
|
|
#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
|
|
|
|
#else /* !CONFIG_X86_32 */
|
|
|
|
#define EFI_LOADER_SIGNATURE "EL64"
|
|
|
|
extern asmlinkage u64 efi_call(void *fp, ...);
|
|
|
|
#define efi_call_phys(f, args...) efi_call((f), args)
|
|
|
|
/*
|
|
* struct efi_scratch - Scratch space used while switching to/from efi_mm
|
|
* @phys_stack: stack used during EFI Mixed Mode
|
|
* @prev_mm: store/restore stolen mm_struct while switching to/from efi_mm
|
|
*/
|
|
struct efi_scratch {
|
|
u64 phys_stack;
|
|
struct mm_struct *prev_mm;
|
|
} __packed;
|
|
|
|
#define arch_efi_call_virt_setup() \
|
|
({ \
|
|
efi_sync_low_kernel_mappings(); \
|
|
kernel_fpu_begin(); \
|
|
firmware_restrict_branch_speculation_start(); \
|
|
\
|
|
if (!efi_enabled(EFI_OLD_MEMMAP)) \
|
|
efi_switch_mm(&efi_mm); \
|
|
})
|
|
|
|
#define arch_efi_call_virt(p, f, args...) \
|
|
efi_call((void *)p->f, args) \
|
|
|
|
#define arch_efi_call_virt_teardown() \
|
|
({ \
|
|
if (!efi_enabled(EFI_OLD_MEMMAP)) \
|
|
efi_switch_mm(efi_scratch.prev_mm); \
|
|
\
|
|
firmware_restrict_branch_speculation_end(); \
|
|
kernel_fpu_end(); \
|
|
})
|
|
|
|
extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
|
|
u32 type, u64 attribute);
|
|
|
|
#ifdef CONFIG_KASAN
|
|
/*
|
|
* CONFIG_KASAN may redefine memset to __memset. __memset function is present
|
|
* only in kernel binary. Since the EFI stub linked into a separate binary it
|
|
* doesn't have __memset(). So we should use standard memset from
|
|
* arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
|
|
*/
|
|
#undef memcpy
|
|
#undef memset
|
|
#undef memmove
|
|
#endif
|
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
extern struct efi_scratch efi_scratch;
|
|
extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
|
|
extern int __init efi_memblock_x86_reserve_range(void);
|
|
extern pgd_t * __init efi_call_phys_prolog(void);
|
|
extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
|
|
extern void __init efi_print_memmap(void);
|
|
extern void __init efi_memory_uc(u64 addr, unsigned long size);
|
|
extern void __init efi_map_region(efi_memory_desc_t *md);
|
|
extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
|
|
extern void efi_sync_low_kernel_mappings(void);
|
|
extern int __init efi_alloc_page_tables(void);
|
|
extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
|
|
extern void __init old_map_region(efi_memory_desc_t *md);
|
|
extern void __init runtime_code_page_mkexec(void);
|
|
extern void __init efi_runtime_update_mappings(void);
|
|
extern void __init efi_dump_pagetable(void);
|
|
extern void __init efi_apply_memmap_quirks(void);
|
|
extern int __init efi_reuse_config(u64 tables, int nr_tables);
|
|
extern void efi_delete_dummy_variable(void);
|
|
extern void efi_switch_mm(struct mm_struct *mm);
|
|
|
|
struct efi_setup_data {
|
|
u64 fw_vendor;
|
|
u64 runtime;
|
|
u64 tables;
|
|
u64 smbios;
|
|
u64 reserved[8];
|
|
};
|
|
|
|
extern u64 efi_setup;
|
|
|
|
#ifdef CONFIG_EFI
|
|
|
|
static inline bool efi_is_native(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
|
|
}
|
|
|
|
static inline bool efi_runtime_supported(void)
|
|
{
|
|
if (efi_is_native())
|
|
return true;
|
|
|
|
if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
extern struct console early_efi_console;
|
|
extern void parse_efi_setup(u64 phys_addr, u32 data_len);
|
|
|
|
extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
|
|
|
|
#ifdef CONFIG_EFI_MIXED
|
|
extern void efi_thunk_runtime_setup(void);
|
|
extern efi_status_t efi_thunk_set_virtual_address_map(
|
|
void *phys_set_virtual_address_map,
|
|
unsigned long memory_map_size,
|
|
unsigned long descriptor_size,
|
|
u32 descriptor_version,
|
|
efi_memory_desc_t *virtual_map);
|
|
#else
|
|
static inline void efi_thunk_runtime_setup(void) {}
|
|
static inline efi_status_t efi_thunk_set_virtual_address_map(
|
|
void *phys_set_virtual_address_map,
|
|
unsigned long memory_map_size,
|
|
unsigned long descriptor_size,
|
|
u32 descriptor_version,
|
|
efi_memory_desc_t *virtual_map)
|
|
{
|
|
return EFI_SUCCESS;
|
|
}
|
|
#endif /* CONFIG_EFI_MIXED */
|
|
|
|
|
|
/* arch specific definitions used by the stub code */
|
|
|
|
struct efi_config {
|
|
u64 image_handle;
|
|
u64 table;
|
|
u64 runtime_services;
|
|
u64 boot_services;
|
|
u64 text_output;
|
|
efi_status_t (*call)(unsigned long, ...);
|
|
bool is64;
|
|
} __packed;
|
|
|
|
__pure const struct efi_config *__efi_early(void);
|
|
|
|
static inline bool efi_is_64bit(void)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_X86_64))
|
|
return false;
|
|
|
|
if (!IS_ENABLED(CONFIG_EFI_MIXED))
|
|
return true;
|
|
|
|
return __efi_early()->is64;
|
|
}
|
|
|
|
#define efi_table_attr(table, attr, instance) \
|
|
(efi_is_64bit() ? \
|
|
((table##_64_t *)(unsigned long)instance)->attr : \
|
|
((table##_32_t *)(unsigned long)instance)->attr)
|
|
|
|
#define efi_call_proto(protocol, f, instance, ...) \
|
|
__efi_early()->call(efi_table_attr(protocol, f, instance), \
|
|
instance, ##__VA_ARGS__)
|
|
|
|
#define efi_call_early(f, ...) \
|
|
__efi_early()->call(efi_table_attr(efi_boot_services, f, \
|
|
__efi_early()->boot_services), __VA_ARGS__)
|
|
|
|
#define __efi_call_early(f, ...) \
|
|
__efi_early()->call((unsigned long)f, __VA_ARGS__);
|
|
|
|
#define efi_call_runtime(f, ...) \
|
|
__efi_early()->call(efi_table_attr(efi_runtime_services, f, \
|
|
__efi_early()->runtime_services), __VA_ARGS__)
|
|
|
|
extern bool efi_reboot_required(void);
|
|
|
|
#else
|
|
static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
|
|
static inline bool efi_reboot_required(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_EFI */
|
|
|
|
#endif /* _ASM_X86_EFI_H */
|