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801820bee9
In order to hand over the framebuffer described by the GOP protocol and discovered by the UEFI stub, make struct screen_info accessible by the stub. This involves allocating a loader data buffer and passing it to the kernel proper via a UEFI Configuration Table, since the UEFI stub executes in the context of the decompressor, and cannot access the kernel's copy of struct screen_info directly. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Borislav Petkov <bp@alien8.de> Cc: David Herrmann <dh.herrmann@gmail.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Jones <pjones@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1461614832-17633-22-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
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* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_EFI_H
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#define __ASM_ARM_EFI_H
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#include <asm/cacheflush.h>
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#include <asm/cachetype.h>
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#include <asm/early_ioremap.h>
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#include <asm/fixmap.h>
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#include <asm/highmem.h>
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#include <asm/mach/map.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#ifdef CONFIG_EFI
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void efi_init(void);
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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 efi_call_virt(f, ...) \
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({ \
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efi_##f##_t *__f; \
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efi_status_t __s; \
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\
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efi_virtmap_load(); \
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__f = efi.systab->runtime->f; \
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__s = __f(__VA_ARGS__); \
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efi_virtmap_unload(); \
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__s; \
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})
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#define __efi_call_virt(f, ...) \
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({ \
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efi_##f##_t *__f; \
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\
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efi_virtmap_load(); \
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__f = efi.systab->runtime->f; \
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__f(__VA_ARGS__); \
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efi_virtmap_unload(); \
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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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check_and_switch_context(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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#else
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#define efi_init()
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#endif /* CONFIG_EFI */
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/* arch specific definitions used by the stub code */
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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() (false)
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struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
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void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
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/*
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* A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
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* so we will reserve that amount of memory. We have no easy way to tell what
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* the actuall size of code + data the uncompressed kernel will use.
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* If this is insufficient, the decompressor will relocate itself out of the
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* way before performing the decompression.
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*/
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#define MAX_UNCOMP_KERNEL_SIZE SZ_32M
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/*
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* The kernel zImage should preferably be located between 32 MB and 128 MB
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* from the base of DRAM. The min address leaves space for a maximal size
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* uncompressed image, and the max address is due to how the zImage decompressor
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* picks a destination address.
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*/
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#define ZIMAGE_OFFSET_LIMIT SZ_128M
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#define MIN_ZIMAGE_OFFSET MAX_UNCOMP_KERNEL_SIZE
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#define MAX_FDT_OFFSET ZIMAGE_OFFSET_LIMIT
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#endif /* _ASM_ARM_EFI_H */
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