1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/efi.h>
4 #include <asm/efi.h>
5
6 #include "efistub.h"
7
8 /*
9 * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
10 * LoongArch. This is the entrypoint that is described in the PE/COFF header
11 * of the core kernel.
12 */
efi_pe_entry(efi_handle_t handle,efi_system_table_t * systab)13 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
14 efi_system_table_t *systab)
15 {
16 efi_loaded_image_t *image;
17 efi_status_t status;
18 unsigned long image_addr;
19 unsigned long image_size = 0;
20 /* addr/point and size pairs for memory management*/
21 char *cmdline_ptr = NULL;
22 efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
23 unsigned long reserve_addr = 0;
24 unsigned long reserve_size = 0;
25
26 WRITE_ONCE(efi_system_table, systab);
27
28 /* Check if we were booted by the EFI firmware */
29 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
30 return EFI_INVALID_PARAMETER;
31
32 /*
33 * Get a handle to the loaded image protocol. This is used to get
34 * information about the running image, such as size and the command
35 * line.
36 */
37 status = efi_bs_call(handle_protocol, handle, &loaded_image_proto,
38 (void *)&image);
39 if (status != EFI_SUCCESS) {
40 efi_err("Failed to get loaded image protocol\n");
41 return status;
42 }
43
44 status = efi_handle_cmdline(image, &cmdline_ptr);
45 if (status != EFI_SUCCESS)
46 return status;
47
48 efi_info("Booting Linux Kernel...\n");
49
50 status = handle_kernel_image(&image_addr, &image_size,
51 &reserve_addr,
52 &reserve_size,
53 image, handle);
54 if (status != EFI_SUCCESS) {
55 efi_err("Failed to relocate kernel\n");
56 return status;
57 }
58
59 status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
60
61 efi_free(image_size, image_addr);
62 efi_free(reserve_size, reserve_addr);
63
64 return status;
65 }
66