62 lines
1.9 KiB
C
62 lines
1.9 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 = 0;
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unsigned long preferred_addr;
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efi_status_t status;
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kernel_size = _edata - _start;
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*image_addr = (unsigned long)_start;
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*image_size = kernel_size + (_end - _edata);
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/*
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* RISC-V kernel maps PAGE_OFFSET virtual address to the same physical
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* address where kernel is booted. That's why kernel should boot from
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* as low as possible to avoid wastage of memory. Currently, dram_base
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* is occupied by the firmware. So the preferred address for kernel to
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* boot is next aligned address. If preferred address is not available,
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* relocate_kernel will fall back to efi_low_alloc_above to allocate
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* lowest possible memory region as long as the address and size meets
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* the alignment constraints.
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*/
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preferred_addr = EFI_KIMG_PREFERRED_ADDRESS;
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status = efi_relocate_kernel(image_addr, kernel_size, *image_size,
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preferred_addr, efi_get_kimg_min_align(),
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0x0);
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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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