b7ac4b8ee7
We can now use arm64 functions to handle the move of the kernel physical mapping: if KASLR is enabled, we will try to get a random seed from the firmware, if not possible, the kernel will be moved to a location that suits its alignment constraints. Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Tested-by: Conor Dooley <conor.dooley@microchip.com> Tested-by: Song Shuai <songshuaishuai@tinylab.org> Reviewed-by: Sami Tolvanen <samitolvanen@google.com> Tested-by: Sami Tolvanen <samitolvanen@google.com> Link: https://lore.kernel.org/r/20230722123850.634544-6-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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*/
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#include <linux/efi.h>
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#include <asm/efi.h>
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#include <asm/sections.h>
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#include <asm/unaligned.h>
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#include "efistub.h"
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unsigned long stext_offset(void)
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{
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/*
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* When built as part of the kernel, the EFI stub cannot branch to the
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* kernel proper via the image header, as the PE/COFF header is
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* strictly not part of the in-memory presentation of the image, only
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* of the file representation. So instead, we need to jump to the
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* actual entrypoint in the .text region of the image.
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*/
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return _start_kernel - _start;
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}
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efi_status_t handle_kernel_image(unsigned long *image_addr,
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unsigned long *image_size,
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unsigned long *reserve_addr,
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unsigned long *reserve_size,
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efi_loaded_image_t *image,
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efi_handle_t image_handle)
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{
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unsigned long kernel_size, kernel_codesize, kernel_memsize;
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efi_status_t status;
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kernel_size = _edata - _start;
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kernel_codesize = __init_text_end - _start;
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kernel_memsize = kernel_size + (_end - _edata);
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*image_addr = (unsigned long)_start;
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*image_size = kernel_memsize;
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*reserve_size = *image_size;
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status = efi_kaslr_relocate_kernel(image_addr,
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reserve_addr, reserve_size,
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kernel_size, kernel_codesize, kernel_memsize,
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efi_kaslr_get_phys_seed(image_handle));
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if (status != EFI_SUCCESS) {
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efi_err("Failed to relocate kernel\n");
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*image_size = 0;
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}
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return status;
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}
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void efi_icache_sync(unsigned long start, unsigned long end)
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{
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asm volatile ("fence.i" ::: "memory");
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}
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