/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_EFI_H
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#define _ASM_X86_EFI_H
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#include <asm/fpu/api.h>
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#include <asm/processor-flags.h>
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#include <asm/tlb.h>
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#include <asm/nospec-branch.h>
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#include <asm/mmu_context.h>
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#include <linux/build_bug.h>
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#include <linux/kernel.h>
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#include <linux/pgtable.h>
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extern unsigned long efi_fw_vendor, efi_config_table;
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/*
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* We map the EFI regions needed for runtime services non-contiguously,
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* with preserved alignment on virtual addresses starting from -4G down
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* for a total max space of 64G. This way, we provide for stable runtime
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* services addresses across kernels so that a kexec'd kernel can still
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* use them.
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*
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* This is the main reason why we're doing stable VA mappings for RT
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* services.
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*/
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#define EFI32_LOADER_SIGNATURE "EL32"
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#define EFI64_LOADER_SIGNATURE "EL64"
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#define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
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/*
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* The EFI services are called through variadic functions in many cases. These
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* functions are implemented in assembler and support only a fixed number of
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* arguments. The macros below allows us to check at build time that we don't
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* try to call them with too many arguments.
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*
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* __efi_nargs() will return the number of arguments if it is 7 or less, and
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* cause a BUILD_BUG otherwise. The limitations of the C preprocessor make it
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* impossible to calculate the exact number of arguments beyond some
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* pre-defined limit. The maximum number of arguments currently supported by
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* any of the thunks is 7, so this is good enough for now and can be extended
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* in the obvious way if we ever need more.
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*/
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#define __efi_nargs(...) __efi_nargs_(__VA_ARGS__)
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#define __efi_nargs_(...) __efi_nargs__(0, ##__VA_ARGS__, \
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__efi_arg_sentinel(7), __efi_arg_sentinel(6), \
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__efi_arg_sentinel(5), __efi_arg_sentinel(4), \
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__efi_arg_sentinel(3), __efi_arg_sentinel(2), \
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__efi_arg_sentinel(1), __efi_arg_sentinel(0))
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#define __efi_nargs__(_0, _1, _2, _3, _4, _5, _6, _7, n, ...) \
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__take_second_arg(n, \
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({ BUILD_BUG_ON_MSG(1, "__efi_nargs limit exceeded"); 8; }))
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#define __efi_arg_sentinel(n) , n
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/*
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* __efi_nargs_check(f, n, ...) will cause a BUILD_BUG if the ellipsis
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* represents more than n arguments.
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*/
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#define __efi_nargs_check(f, n, ...) \
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__efi_nargs_check_(f, __efi_nargs(__VA_ARGS__), n)
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#define __efi_nargs_check_(f, p, n) __efi_nargs_check__(f, p, n)
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#define __efi_nargs_check__(f, p, n) ({ \
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BUILD_BUG_ON_MSG( \
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(p) > (n), \
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#f " called with too many arguments (" #p ">" #n ")"); \
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})
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#ifdef CONFIG_X86_32
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#define arch_efi_call_virt_setup() \
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({ \
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kernel_fpu_begin(); \
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firmware_restrict_branch_speculation_start(); \
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})
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#define arch_efi_call_virt_teardown() \
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({ \
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firmware_restrict_branch_speculation_end(); \
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kernel_fpu_end(); \
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})
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#define arch_efi_call_virt(p, f, args...) p->f(args)
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#else /* !CONFIG_X86_32 */
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#define EFI_LOADER_SIGNATURE "EL64"
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extern asmlinkage u64 __efi_call(void *fp, ...);
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#define efi_call(...) ({ \
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__efi_nargs_check(efi_call, 7, __VA_ARGS__); \
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__efi_call(__VA_ARGS__); \
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})
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/*
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* struct efi_scratch - Scratch space used while switching to/from efi_mm
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* @phys_stack: stack used during EFI Mixed Mode
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* @prev_mm: store/restore stolen mm_struct while switching to/from efi_mm
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*/
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struct efi_scratch {
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u64 phys_stack;
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struct mm_struct *prev_mm;
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} __packed;
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#define arch_efi_call_virt_setup() \
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({ \
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efi_sync_low_kernel_mappings(); \
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kernel_fpu_begin(); \
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firmware_restrict_branch_speculation_start(); \
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efi_switch_mm(&efi_mm); \
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})
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#define arch_efi_call_virt(p, f, args...) \
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efi_call((void *)p->f, args) \
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#define arch_efi_call_virt_teardown() \
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({ \
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efi_switch_mm(efi_scratch.prev_mm); \
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firmware_restrict_branch_speculation_end(); \
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kernel_fpu_end(); \
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})
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#ifdef CONFIG_KASAN
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/*
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* CONFIG_KASAN may redefine memset to __memset. __memset function is present
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* only in kernel binary. Since the EFI stub linked into a separate binary it
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* doesn't have __memset(). So we should use standard memset from
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* arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
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*/
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#undef memcpy
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#undef memset
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#undef memmove
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#endif
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#endif /* CONFIG_X86_32 */
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extern struct efi_scratch efi_scratch;
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extern int __init efi_memblock_x86_reserve_range(void);
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extern void __init efi_print_memmap(void);
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extern void __init efi_map_region(efi_memory_desc_t *md);
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extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
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extern void efi_sync_low_kernel_mappings(void);
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extern int __init efi_alloc_page_tables(void);
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extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
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extern void __init efi_runtime_update_mappings(void);
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extern void __init efi_dump_pagetable(void);
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extern void __init efi_apply_memmap_quirks(void);
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extern int __init efi_reuse_config(u64 tables, int nr_tables);
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extern void efi_delete_dummy_variable(void);
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extern void efi_switch_mm(struct mm_struct *mm);
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extern void efi_recover_from_page_fault(unsigned long phys_addr);
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extern void efi_free_boot_services(void);
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/* kexec external ABI */
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struct efi_setup_data {
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u64 fw_vendor;
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u64 __unused;
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u64 tables;
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u64 smbios;
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u64 reserved[8];
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};
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extern u64 efi_setup;
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#ifdef CONFIG_EFI
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extern efi_status_t __efi64_thunk(u32, ...);
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#define efi64_thunk(...) ({ \
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__efi_nargs_check(efi64_thunk, 6, __VA_ARGS__); \
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__efi64_thunk(__VA_ARGS__); \
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})
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static inline bool efi_is_mixed(void)
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{
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if (!IS_ENABLED(CONFIG_EFI_MIXED))
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return false;
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return IS_ENABLED(CONFIG_X86_64) && !efi_enabled(EFI_64BIT);
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}
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static inline bool efi_runtime_supported(void)
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{
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if (IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT))
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return true;
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return IS_ENABLED(CONFIG_EFI_MIXED);
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}
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extern void parse_efi_setup(u64 phys_addr, u32 data_len);
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extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
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extern void efi_thunk_runtime_setup(void);
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efi_status_t efi_set_virtual_address_map(unsigned long memory_map_size,
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unsigned long descriptor_size,
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u32 descriptor_version,
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efi_memory_desc_t *virtual_map,
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unsigned long systab_phys);
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/* arch specific definitions used by the stub code */
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#ifdef CONFIG_EFI_MIXED
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#define ARCH_HAS_EFISTUB_WRAPPERS
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static inline bool efi_is_64bit(void)
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{
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extern const bool efi_is64;
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return efi_is64;
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}
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static inline bool efi_is_native(void)
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{
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if (!IS_ENABLED(CONFIG_X86_64))
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return true;
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return efi_is_64bit();
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}
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#define efi_mixed_mode_cast(attr) \
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__builtin_choose_expr( \
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__builtin_types_compatible_p(u32, __typeof__(attr)), \
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(unsigned long)(attr), (attr))
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#define efi_table_attr(inst, attr) \
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(efi_is_native() \
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? inst->attr \
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: (__typeof__(inst->attr)) \
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efi_mixed_mode_cast(inst->mixed_mode.attr))
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/*
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* The following macros allow translating arguments if necessary from native to
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* mixed mode. The use case for this is to initialize the upper 32 bits of
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* output parameters, and where the 32-bit method requires a 64-bit argument,
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* which must be split up into two arguments to be thunked properly.
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*
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* As examples, the AllocatePool boot service returns the address of the
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* allocation, but it will not set the high 32 bits of the address. To ensure
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* that the full 64-bit address is initialized, we zero-init the address before
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* calling the thunk.
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*
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* The FreePages boot service takes a 64-bit physical address even in 32-bit
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* mode. For the thunk to work correctly, a native 64-bit call of
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* free_pages(addr, size)
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* must be translated to
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* efi64_thunk(free_pages, addr & U32_MAX, addr >> 32, size)
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* so that the two 32-bit halves of addr get pushed onto the stack separately.
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*/
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static inline void *efi64_zero_upper(void *p)
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{
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((u32 *)p)[1] = 0;
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return p;
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}
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static inline u32 efi64_convert_status(efi_status_t status)
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{
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return (u32)(status | (u64)status >> 32);
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}
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#define __efi64_argmap_free_pages(addr, size) \
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((addr), 0, (size))
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#define __efi64_argmap_get_memory_map(mm_size, mm, key, size, ver) \
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((mm_size), (mm), efi64_zero_upper(key), efi64_zero_upper(size), (ver))
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#define __efi64_argmap_allocate_pool(type, size, buffer) \
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((type), (size), efi64_zero_upper(buffer))
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#define __efi64_argmap_create_event(type, tpl, f, c, event) \
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((type), (tpl), (f), (c), efi64_zero_upper(event))
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#define __efi64_argmap_set_timer(event, type, time) \
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((event), (type), lower_32_bits(time), upper_32_bits(time))
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#define __efi64_argmap_wait_for_event(num, event, index) \
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((num), (event), efi64_zero_upper(index))
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#define __efi64_argmap_handle_protocol(handle, protocol, interface) \
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((handle), (protocol), efi64_zero_upper(interface))
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#define __efi64_argmap_locate_protocol(protocol, reg, interface) \
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((protocol), (reg), efi64_zero_upper(interface))
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#define __efi64_argmap_locate_device_path(protocol, path, handle) \
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((protocol), (path), efi64_zero_upper(handle))
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#define __efi64_argmap_exit(handle, status, size, data) \
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((handle), efi64_convert_status(status), (size), (data))
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/* PCI I/O */
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#define __efi64_argmap_get_location(protocol, seg, bus, dev, func) \
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((protocol), efi64_zero_upper(seg), efi64_zero_upper(bus), \
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efi64_zero_upper(dev), efi64_zero_upper(func))
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/* LoadFile */
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#define __efi64_argmap_load_file(protocol, path, policy, bufsize, buf) \
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((protocol), (path), (policy), efi64_zero_upper(bufsize), (buf))
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/* Graphics Output Protocol */
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#define __efi64_argmap_query_mode(gop, mode, size, info) \
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((gop), (mode), efi64_zero_upper(size), efi64_zero_upper(info))
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/*
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* The macros below handle the plumbing for the argument mapping. To add a
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* mapping for a specific EFI method, simply define a macro
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* __efi64_argmap_<method name>, following the examples above.
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*/
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#define __efi64_thunk_map(inst, func, ...) \
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efi64_thunk(inst->mixed_mode.func, \
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__efi64_argmap(__efi64_argmap_ ## func(__VA_ARGS__), \
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(__VA_ARGS__)))
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#define __efi64_argmap(mapped, args) \
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__PASTE(__efi64_argmap__, __efi_nargs(__efi_eat mapped))(mapped, args)
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#define __efi64_argmap__0(mapped, args) __efi_eval mapped
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#define __efi64_argmap__1(mapped, args) __efi_eval args
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#define __efi_eat(...)
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#define __efi_eval(...) __VA_ARGS__
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/* The three macros below handle dispatching via the thunk if needed */
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#define efi_call_proto(inst, func, ...) \
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(efi_is_native() \
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? inst->func(inst, ##__VA_ARGS__) \
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: __efi64_thunk_map(inst, func, inst, ##__VA_ARGS__))
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#define efi_bs_call(func, ...) \
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(efi_is_native() \
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? efi_system_table->boottime->func(__VA_ARGS__) \
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: __efi64_thunk_map(efi_table_attr(efi_system_table, \
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boottime), \
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func, __VA_ARGS__))
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#define efi_rt_call(func, ...) \
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(efi_is_native() \
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? efi_system_table->runtime->func(__VA_ARGS__) \
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: __efi64_thunk_map(efi_table_attr(efi_system_table, \
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runtime), \
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func, __VA_ARGS__))
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#else /* CONFIG_EFI_MIXED */
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static inline bool efi_is_64bit(void)
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{
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return IS_ENABLED(CONFIG_X86_64);
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}
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#endif /* CONFIG_EFI_MIXED */
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extern bool efi_reboot_required(void);
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extern bool efi_is_table_address(unsigned long phys_addr);
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extern void efi_find_mirror(void);
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extern void efi_reserve_boot_services(void);
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#else
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static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
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static inline bool efi_reboot_required(void)
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{
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return false;
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}
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static inline bool efi_is_table_address(unsigned long phys_addr)
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{
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return false;
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}
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static inline void efi_find_mirror(void)
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{
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}
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static inline void efi_reserve_boot_services(void)
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{
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}
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#endif /* CONFIG_EFI */
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#ifdef CONFIG_EFI_FAKE_MEMMAP
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extern void __init efi_fake_memmap_early(void);
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#else
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static inline void efi_fake_memmap_early(void)
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{
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}
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#endif
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#endif /* _ASM_X86_EFI_H */
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