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6cfcd6f001
Commit a8147dba75 ("efi/x86: Rename efi_is_native() to efi_is_mixed()")
renamed and refactored efi_is_native() into efi_is_mixed(), but failed
to take into account that these are not diametrical opposites.
Mixed mode is a construct that permits 64-bit kernels to boot on 32-bit
firmware, but there is another non-native combination which is supported,
i.e., 32-bit kernels booting on 64-bit firmware, but only for boot and not
for runtime services. Also, mixed mode can be disabled in Kconfig, in
which case the 64-bit kernel can still be booted from 32-bit firmware,
but without access to runtime services.
Due to this oversight, efi_runtime_supported() now incorrectly returns
true for such configurations, resulting in crashes at boot. So fix this
by making efi_runtime_supported() aware of this.
As a side effect, some efi_thunk_xxx() stubs have become obsolete, so
remove them as well.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Matthew Garrett <mjg59@google.com>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20200103113953.9571-4-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
259 lines
7.2 KiB
C
259 lines
7.2 KiB
C
/* 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/pgtable.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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/*
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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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* This flag is used in conjunction with a chicken bit called
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* "efi=old_map" which can be used as a fallback to the old runtime
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* services mapping method in case there's some b0rkage with a
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* particular EFI implementation (haha, it is hard to hold up the
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* sarcasm here...).
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*/
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#define EFI_OLD_MEMMAP EFI_ARCH_1
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#define EFI32_LOADER_SIGNATURE "EL32"
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#define EFI64_LOADER_SIGNATURE "EL64"
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#define MAX_CMDLINE_ADDRESS UINT_MAX
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#define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
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#ifdef CONFIG_X86_32
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extern asmlinkage unsigned long efi_call_phys(void *, ...);
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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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/*
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* Wrap all the virtual calls in a way that forces the parameters on the stack.
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*/
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#define arch_efi_call_virt(p, f, args...) \
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({ \
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((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \
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})
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#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
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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_phys(f, args...) efi_call((f), args)
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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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\
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if (!efi_enabled(EFI_OLD_MEMMAP)) \
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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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if (!efi_enabled(EFI_OLD_MEMMAP)) \
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efi_switch_mm(efi_scratch.prev_mm); \
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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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extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
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u32 type, u64 attribute);
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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 void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
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extern int __init efi_memblock_x86_reserve_range(void);
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extern pgd_t * __init efi_call_phys_prolog(void);
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extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
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extern void __init efi_print_memmap(void);
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extern void __init efi_memory_uc(u64 addr, unsigned long size);
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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 old_map_region(efi_memory_desc_t *md);
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extern void __init runtime_code_page_mkexec(void);
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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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struct efi_setup_data {
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u64 fw_vendor;
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u64 runtime;
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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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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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if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
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return true;
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return false;
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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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extern efi_status_t efi_thunk_set_virtual_address_map(
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void *phys_set_virtual_address_map,
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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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/* arch specific definitions used by the stub code */
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__pure bool efi_is_64bit(void);
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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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if (!IS_ENABLED(CONFIG_EFI_MIXED))
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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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#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(inst->mixed_mode.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(efi_table_attr(efi_system_table(), \
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boottime)->mixed_mode.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(efi_table_attr(efi_system_table(), \
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runtime)->mixed_mode.func, __VA_ARGS__))
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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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