1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Author: Yun Liu <liuyun@loongson.cn> 4 * Huacai Chen <chenhuacai@loongson.cn> 5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 6 */ 7 8 #include <asm/efi.h> 9 #include <asm/addrspace.h> 10 #include "efistub.h" 11 12 extern int kernel_asize; 13 extern int kernel_fsize; 14 extern int kernel_offset; 15 extern int kernel_entry; 16 17 efi_status_t handle_kernel_image(unsigned long *image_addr, 18 unsigned long *image_size, 19 unsigned long *reserve_addr, 20 unsigned long *reserve_size, 21 efi_loaded_image_t *image, 22 efi_handle_t image_handle) 23 { 24 int nr_pages = round_up(kernel_asize, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; 25 efi_physical_addr_t kernel_addr = EFI_KIMG_PREFERRED_ADDRESS; 26 efi_status_t status; 27 28 /* 29 * Allocate space for the kernel image at the preferred offset. This is 30 * the only location in memory from where we can execute the image, so 31 * no point in falling back to another allocation. 32 */ 33 status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, 34 EFI_LOADER_DATA, nr_pages, &kernel_addr); 35 if (status != EFI_SUCCESS) 36 return status; 37 38 *image_addr = EFI_KIMG_PREFERRED_ADDRESS; 39 *image_size = kernel_asize; 40 41 memcpy((void *)EFI_KIMG_PREFERRED_ADDRESS, 42 (void *)&kernel_offset - kernel_offset, 43 kernel_fsize); 44 45 return status; 46 } 47 48 unsigned long kernel_entry_address(void) 49 { 50 unsigned long base = (unsigned long)&kernel_offset - kernel_offset; 51 52 return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS; 53 } 54