1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/efi.h>
4#include <linux/screen_info.h>
5
6#include <asm/efi.h>
7
8#include "efistub.h"
9
10static unsigned long screen_info_offset;
11
12struct screen_info *alloc_screen_info(void)
13{
14	if (IS_ENABLED(CONFIG_ARM))
15		return __alloc_screen_info();
16	return (void *)&screen_info + screen_info_offset;
17}
18
19/*
20 * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
21 * LoongArch. This is the entrypoint that is described in the PE/COFF header
22 * of the core kernel.
23 */
24efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
25				   efi_system_table_t *systab)
26{
27	efi_loaded_image_t *image;
28	efi_status_t status;
29	unsigned long image_addr;
30	unsigned long image_size = 0;
31	/* addr/point and size pairs for memory management*/
32	char *cmdline_ptr = NULL;
33	efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
34	unsigned long reserve_addr = 0;
35	unsigned long reserve_size = 0;
36
37	WRITE_ONCE(efi_system_table, systab);
38
39	/* Check if we were booted by the EFI firmware */
40	if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
41		return EFI_INVALID_PARAMETER;
42
43	/*
44	 * Get a handle to the loaded image protocol.  This is used to get
45	 * information about the running image, such as size and the command
46	 * line.
47	 */
48	status = efi_bs_call(handle_protocol, handle, &loaded_image_proto,
49			     (void *)&image);
50	if (status != EFI_SUCCESS) {
51		efi_err("Failed to get loaded image protocol\n");
52		return status;
53	}
54
55	status = efi_handle_cmdline(image, &cmdline_ptr);
56	if (status != EFI_SUCCESS)
57		return status;
58
59	efi_info("Booting Linux Kernel...\n");
60
61	status = handle_kernel_image(&image_addr, &image_size,
62				     &reserve_addr,
63				     &reserve_size,
64				     image, handle);
65	if (status != EFI_SUCCESS) {
66		efi_err("Failed to relocate kernel\n");
67		return status;
68	}
69
70	screen_info_offset = image_addr - (unsigned long)image->image_base;
71
72	status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
73
74	efi_free(image_size, image_addr);
75	efi_free(reserve_size, reserve_addr);
76
77	return status;
78}
79