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
17	if (IS_ENABLED(CONFIG_X86) ||
18	    IS_ENABLED(CONFIG_EFI_EARLYCON) ||
19	    IS_ENABLED(CONFIG_SYSFB))
20		return (void *)&screen_info + screen_info_offset;
21
22	return NULL;
23}
24
25/*
26 * EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
27 * LoongArch. This is the entrypoint that is described in the PE/COFF header
28 * of the core kernel.
29 */
30efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
31				   efi_system_table_t *systab)
32{
33	efi_loaded_image_t *image;
34	efi_status_t status;
35	unsigned long image_addr;
36	unsigned long image_size = 0;
37	/* addr/point and size pairs for memory management*/
38	char *cmdline_ptr = NULL;
39	efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
40	unsigned long reserve_addr = 0;
41	unsigned long reserve_size = 0;
42
43	WRITE_ONCE(efi_system_table, systab);
44
45	/* Check if we were booted by the EFI firmware */
46	if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
47		return EFI_INVALID_PARAMETER;
48
49	/*
50	 * Get a handle to the loaded image protocol.  This is used to get
51	 * information about the running image, such as size and the command
52	 * line.
53	 */
54	status = efi_bs_call(handle_protocol, handle, &loaded_image_proto,
55			     (void *)&image);
56	if (status != EFI_SUCCESS) {
57		efi_err("Failed to get loaded image protocol\n");
58		return status;
59	}
60
61	status = efi_handle_cmdline(image, &cmdline_ptr);
62	if (status != EFI_SUCCESS)
63		return status;
64
65	efi_info("Booting Linux Kernel...\n");
66
67	status = handle_kernel_image(&image_addr, &image_size,
68				     &reserve_addr,
69				     &reserve_size,
70				     image, handle);
71	if (status != EFI_SUCCESS) {
72		efi_err("Failed to relocate kernel\n");
73		return status;
74	}
75
76	screen_info_offset = image_addr - (unsigned long)image->image_base;
77
78	status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
79
80	efi_free(image_size, image_addr);
81	efi_free(reserve_size, reserve_addr);
82
83	return status;
84}
85