6208857b8f
The way we use the base of DRAM in the EFI stub is problematic as it is ill defined what the base of DRAM actually means. There are some restrictions on the placement of FDT and initrd which are defined in terms of dram_base, but given that the placement of the kernel in memory is what defines these boundaries (as on ARM, this is where the linear region starts), it is better to use the image address in these cases, and disregard dram_base altogether. Reviewed-by: Maxim Uvarov <maxim.uvarov@linaro.org> Tested-by: Maxim Uvarov <maxim.uvarov@linaro.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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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/ptrace.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 arch_efi_call_virt_setup() efi_virtmap_load()
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#define arch_efi_call_virt_teardown() efi_virtmap_unload()
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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_IRQ_FLAGS_MASK \
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(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
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PSR_T_BIT | MODE_MASK)
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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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struct screen_info *alloc_screen_info(void);
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void free_screen_info(struct screen_info *si);
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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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/*
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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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* phys-to-virt patching requires that the physical to virtual offset fits
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* into the immediate field of an add/sub instruction, which comes down to the
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* 24 least significant bits being zero, and so the offset should be a multiple
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* of 16 MB. Since PAGE_OFFSET itself is a multiple of 16 MB, the physical
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* base should be aligned to 16 MB as well.
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*/
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#define EFI_PHYS_ALIGN SZ_16M
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/* on ARM, the FDT should be located in a lowmem region */
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static inline unsigned long efi_get_max_fdt_addr(unsigned long image_addr)
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{
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return round_down(image_addr, EFI_PHYS_ALIGN) + SZ_512M;
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}
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/* on ARM, the initrd should be loaded in a lowmem region */
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static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
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{
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return round_down(image_addr, EFI_PHYS_ALIGN) + SZ_512M;
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}
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struct efi_arm_entry_state {
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u32 cpsr_before_ebs;
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u32 sctlr_before_ebs;
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u32 cpsr_after_ebs;
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u32 sctlr_after_ebs;
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};
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#endif /* _ASM_ARM_EFI_H */
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