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61d920c3b2
commit 760b61d76d upstream.
To prevent the compiler from emitting absolute references to screen_info
when building position independent code, redeclare the symbol with hidden
visibility.
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170818194947.19347-3-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
#ifndef _ASM_EFI_H
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#define _ASM_EFI_H
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/neon.h>
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#include <asm/ptrace.h>
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#include <asm/tlbflush.h>
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#ifdef CONFIG_EFI
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extern void efi_init(void);
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#else
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#define efi_init()
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#endif
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int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
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int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
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#define arch_efi_call_virt_setup() \
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({ \
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kernel_neon_begin(); \
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efi_virtmap_load(); \
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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 *__f; \
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__f = p->f; \
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__f(args); \
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})
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#define arch_efi_call_virt_teardown() \
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({ \
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efi_virtmap_unload(); \
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kernel_neon_end(); \
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})
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#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
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/* arch specific definitions used by the stub code */
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/*
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* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
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* start of kernel and may not cross a 2MiB boundary. We set alignment to
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* 2MiB so we know it won't cross a 2MiB boundary.
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*/
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#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
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#define MAX_FDT_OFFSET SZ_512M
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#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
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#define __efi_call_early(f, ...) f(__VA_ARGS__)
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#define efi_is_64bit() (true)
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#define alloc_screen_info(x...) &screen_info
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#define free_screen_info(x...)
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/* redeclare as 'hidden' so the compiler will generate relative references */
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extern struct screen_info screen_info __attribute__((__visibility__("hidden")));
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static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
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{
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}
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#define EFI_ALLOC_ALIGN SZ_64K
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/*
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* On ARM systems, virtually remapped UEFI runtime services are set up in two
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* distinct stages:
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* - The stub retrieves the final version of the memory map from UEFI, populates
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* the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
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* service to communicate the new mapping to the firmware (Note that the new
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* mapping is not live at this time)
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* - During an early initcall(), the EFI system table is permanently remapped
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* and the virtual remapping of the UEFI Runtime Services regions is loaded
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* into a private set of page tables. If this all succeeds, the Runtime
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* Services are enabled and the EFI_RUNTIME_SERVICES bit set.
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*/
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static inline void efi_set_pgd(struct mm_struct *mm)
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{
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switch_mm(NULL, mm, NULL);
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}
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void efi_virtmap_load(void);
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void efi_virtmap_unload(void);
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#endif /* _ASM_EFI_H */
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