54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Author: Yun Liu <liuyun@loongson.cn>
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* Huacai Chen <chenhuacai@loongson.cn>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <asm/efi.h>
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#include <asm/addrspace.h>
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#include "efistub.h"
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extern int kernel_asize;
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extern int kernel_fsize;
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extern int kernel_offset;
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extern int kernel_entry;
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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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int nr_pages = round_up(kernel_asize, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
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efi_physical_addr_t kernel_addr = EFI_KIMG_PREFERRED_ADDRESS;
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efi_status_t status;
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/*
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* Allocate space for the kernel image at the preferred offset. This is
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* the only location in memory from where we can execute the image, so
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* no point in falling back to another allocation.
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*/
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status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
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EFI_LOADER_DATA, nr_pages, &kernel_addr);
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if (status != EFI_SUCCESS)
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return status;
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*image_addr = EFI_KIMG_PREFERRED_ADDRESS;
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*image_size = kernel_asize;
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memcpy((void *)EFI_KIMG_PREFERRED_ADDRESS,
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(void *)&kernel_offset - kernel_offset,
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kernel_fsize);
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return status;
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}
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unsigned long kernel_entry_address(void)
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{
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unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
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return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS;
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}
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