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
handle_kernel_image(unsigned long * image_addr,unsigned long * image_size,unsigned long * reserve_addr,unsigned long * reserve_size,efi_loaded_image_t * image,efi_handle_t image_handle)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
kernel_entry_address(void)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