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/* 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.
*/
#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
static inline void efi_fpu_begin(void)
{
/*
* The UEFI calling convention (UEFI spec 2.3.2 and 2.3.4) requires
* that FCW and MXCSR (64-bit) must be initialized prior to calling
* UEFI code. (Oddly the spec does not require that the FPU stack
* be empty.)
*/
kernel_fpu_begin_mask(KFPU_387 | KFPU_MXCSR);
}
static inline void efi_fpu_end(void)
{
kernel_fpu_end();
}
#ifdef CONFIG_X86_32
#define EFI_X86_KERNEL_ALLOC_LIMIT (SZ_512M - 1)
extern asmlinkage unsigned long efi_call_phys(void *, ...);
#define arch_efi_call_virt_setup() \
({ \
efi_fpu_begin(); \
firmware_restrict_branch_speculation_start(); \
})
#define arch_efi_call_virt_teardown() \
({ \
firmware_restrict_branch_speculation_end(); \
efi_fpu_end(); \
})
#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
#else /* !CONFIG_X86_32 */
#define EFI_X86_KERNEL_ALLOC_LIMIT EFI_ALLOC_LIMIT
extern asmlinkage u64 efi_call(void *fp, ...);
/*
* 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(); \
efi_fpu_begin(); \
firmware_restrict_branch_speculation_start(); \
efi_switch_mm(&efi_mm); \
})
#undef arch_efi_call_virt
#define arch_efi_call_virt(p, f, args...) \
efi_call((void *)p->f, args)
#define arch_efi_call_virt_teardown() \
({ \
efi_switch_mm(efi_scratch.prev_mm); \
firmware_restrict_branch_speculation_end(); \
efi_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 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);
extern void efi_recover_from_page_fault(unsigned long phys_addr);
extern void efi_free_boot_services(void);
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_mixed(void)
{
if (!IS_ENABLED(CONFIG_EFI_MIXED))
return false;
return IS_ENABLED(CONFIG_X86_64) && !efi_enabled(EFI_64BIT);
}
static inline bool efi_runtime_supported(void)
{
if (IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT))
return true;
return IS_ENABLED(CONFIG_EFI_MIXED);
}
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);
extern void efi_thunk_runtime_setup(void);
efi_status_t efi_set_virtual_address_map(unsigned long memory_map_size,
unsigned long descriptor_size,
u32 descriptor_version,
efi_memory_desc_t *virtual_map);
/* 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;
}
static inline bool efi_is_native(void)
{
if (!IS_ENABLED(CONFIG_X86_64))
return true;
return efi_is_64bit();
}
#define efi_mixed_mode_cast(attr) \
__builtin_choose_expr( \
__builtin_types_compatible_p(u32, __typeof__(attr)), \
(unsigned long)(attr), (attr))
#define efi_table_attr(table, attr, instance) ({ \
__typeof__(((table##_t *)0)->attr) __ret; \
if (efi_is_native()) { \
__ret = ((table##_t *)(unsigned long)instance)->attr; \
} else { \
__ret = (__typeof__(__ret))efi_mixed_mode_cast( \
((table##_t *)(unsigned long)instance)->mixed_mode.attr);\
} \
__ret; \
})
#define efi_call_proto(protocol, f, instance, ...) \
__efi_early()->call((unsigned long) \
efi_table_attr(protocol, f, instance), \
instance, ##__VA_ARGS__)
#define efi_dxe_call(f, ...) \
__efi_early()->call((unsigned long) \
efi_table_attr(efi_dxe_services_table, \
f, \
efi_dxe_table), \
##__VA_ARGS__)
#define efi_call_early(f, ...) \
__efi_early()->call((unsigned long) \
efi_table_attr(efi_boot_services, f, \
__efi_early()->boot_services), __VA_ARGS__)
#define efi_call_runtime(f, ...) \
__efi_early()->call((unsigned long) \
efi_table_attr(efi_runtime_services, f, \
__efi_early()->runtime_services), __VA_ARGS__)
extern bool efi_reboot_required(void);
extern bool efi_is_table_address(unsigned long phys_addr);
extern void efi_find_mirror(void);
extern void efi_reserve_boot_services(void);
#else
static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
static inline bool efi_reboot_required(void)
{
return false;
}
static inline bool efi_is_table_address(unsigned long phys_addr)
{
return false;
}
static inline void efi_find_mirror(void)
{
}
static inline void efi_reserve_boot_services(void)
{
}
#endif /* CONFIG_EFI */
#endif /* _ASM_X86_EFI_H */