2 * EFI stub implementation that is shared by arm and arm64 architectures.
3 * This should be #included by the EFI stub implementation files.
5 * Copyright (C) 2013,2014 Linaro Limited
6 * Roy Franz <roy.franz@linaro.org
7 * Copyright (C) 2013 Red Hat, Inc.
8 * Mark Salter <msalter@redhat.com>
10 * This file is part of the Linux kernel, and is made available under the
11 * terms of the GNU General Public License version 2.
15 #include <linux/efi.h>
20 static int __init
efi_secureboot_enabled(efi_system_table_t
*sys_table_arg
)
22 static efi_guid_t
const var_guid __initconst
= EFI_GLOBAL_VARIABLE_GUID
;
23 static efi_char16_t
const var_name
[] __initconst
= {
24 'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', 0 };
26 efi_get_variable_t
*f_getvar
= sys_table_arg
->runtime
->get_variable
;
27 unsigned long size
= sizeof(u8
);
31 status
= f_getvar((efi_char16_t
*)var_name
, (efi_guid_t
*)&var_guid
,
44 efi_status_t
efi_open_volume(efi_system_table_t
*sys_table_arg
,
45 void *__image
, void **__fh
)
47 efi_file_io_interface_t
*io
;
48 efi_loaded_image_t
*image
= __image
;
49 efi_file_handle_t
*fh
;
50 efi_guid_t fs_proto
= EFI_FILE_SYSTEM_GUID
;
52 void *handle
= (void *)(unsigned long)image
->device_handle
;
54 status
= sys_table_arg
->boottime
->handle_protocol(handle
,
55 &fs_proto
, (void **)&io
);
56 if (status
!= EFI_SUCCESS
) {
57 efi_printk(sys_table_arg
, "Failed to handle fs_proto\n");
61 status
= io
->open_volume(io
, &fh
);
62 if (status
!= EFI_SUCCESS
)
63 efi_printk(sys_table_arg
, "Failed to open volume\n");
69 efi_status_t
efi_file_close(void *handle
)
71 efi_file_handle_t
*fh
= handle
;
73 return fh
->close(handle
);
77 efi_file_read(void *handle
, unsigned long *size
, void *addr
)
79 efi_file_handle_t
*fh
= handle
;
81 return fh
->read(handle
, size
, addr
);
86 efi_file_size(efi_system_table_t
*sys_table_arg
, void *__fh
,
87 efi_char16_t
*filename_16
, void **handle
, u64
*file_sz
)
89 efi_file_handle_t
*h
, *fh
= __fh
;
90 efi_file_info_t
*info
;
92 efi_guid_t info_guid
= EFI_FILE_INFO_ID
;
93 unsigned long info_sz
;
95 status
= fh
->open(fh
, &h
, filename_16
, EFI_FILE_MODE_READ
, (u64
)0);
96 if (status
!= EFI_SUCCESS
) {
97 efi_printk(sys_table_arg
, "Failed to open file: ");
98 efi_char16_printk(sys_table_arg
, filename_16
);
99 efi_printk(sys_table_arg
, "\n");
106 status
= h
->get_info(h
, &info_guid
, &info_sz
, NULL
);
107 if (status
!= EFI_BUFFER_TOO_SMALL
) {
108 efi_printk(sys_table_arg
, "Failed to get file info size\n");
113 status
= sys_table_arg
->boottime
->allocate_pool(EFI_LOADER_DATA
,
114 info_sz
, (void **)&info
);
115 if (status
!= EFI_SUCCESS
) {
116 efi_printk(sys_table_arg
, "Failed to alloc mem for file info\n");
120 status
= h
->get_info(h
, &info_guid
, &info_sz
,
122 if (status
== EFI_BUFFER_TOO_SMALL
) {
123 sys_table_arg
->boottime
->free_pool(info
);
127 *file_sz
= info
->file_size
;
128 sys_table_arg
->boottime
->free_pool(info
);
130 if (status
!= EFI_SUCCESS
)
131 efi_printk(sys_table_arg
, "Failed to get initrd info\n");
138 void efi_char16_printk(efi_system_table_t
*sys_table_arg
,
141 struct efi_simple_text_output_protocol
*out
;
143 out
= (struct efi_simple_text_output_protocol
*)sys_table_arg
->con_out
;
144 out
->output_string(out
, str
);
149 * This function handles the architcture specific differences between arm and
150 * arm64 regarding where the kernel image must be loaded and any memory that
151 * must be reserved. On failure it is required to free all
152 * all allocations it has made.
154 efi_status_t
handle_kernel_image(efi_system_table_t
*sys_table
,
155 unsigned long *image_addr
,
156 unsigned long *image_size
,
157 unsigned long *reserve_addr
,
158 unsigned long *reserve_size
,
159 unsigned long dram_base
,
160 efi_loaded_image_t
*image
);
162 * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint
163 * that is described in the PE/COFF header. Most of the code is the same
164 * for both archictectures, with the arch-specific code provided in the
165 * handle_kernel_image() function.
167 unsigned long __init
efi_entry(void *handle
, efi_system_table_t
*sys_table
,
168 unsigned long *image_addr
)
170 efi_loaded_image_t
*image
;
172 unsigned long image_size
= 0;
173 unsigned long dram_base
;
174 /* addr/point and size pairs for memory management*/
175 unsigned long initrd_addr
;
177 unsigned long fdt_addr
= 0; /* Original DTB */
178 u64 fdt_size
= 0; /* We don't get size from configuration table */
179 char *cmdline_ptr
= NULL
;
180 int cmdline_size
= 0;
181 unsigned long new_fdt_addr
;
182 efi_guid_t loaded_image_proto
= LOADED_IMAGE_PROTOCOL_GUID
;
183 unsigned long reserve_addr
= 0;
184 unsigned long reserve_size
= 0;
186 /* Check if we were booted by the EFI firmware */
187 if (sys_table
->hdr
.signature
!= EFI_SYSTEM_TABLE_SIGNATURE
)
190 pr_efi(sys_table
, "Booting Linux Kernel...\n");
193 * Get a handle to the loaded image protocol. This is used to get
194 * information about the running image, such as size and the command
197 status
= sys_table
->boottime
->handle_protocol(handle
,
198 &loaded_image_proto
, (void *)&image
);
199 if (status
!= EFI_SUCCESS
) {
200 pr_efi_err(sys_table
, "Failed to get loaded image protocol\n");
204 dram_base
= get_dram_base(sys_table
);
205 if (dram_base
== EFI_ERROR
) {
206 pr_efi_err(sys_table
, "Failed to find DRAM base\n");
209 status
= handle_kernel_image(sys_table
, image_addr
, &image_size
,
213 if (status
!= EFI_SUCCESS
) {
214 pr_efi_err(sys_table
, "Failed to relocate kernel\n");
219 * Get the command line from EFI, using the LOADED_IMAGE
220 * protocol. We are going to copy the command line into the
221 * device tree, so this can be allocated anywhere.
223 cmdline_ptr
= efi_convert_cmdline(sys_table
, image
, &cmdline_size
);
225 pr_efi_err(sys_table
, "getting command line via LOADED_IMAGE_PROTOCOL\n");
226 goto fail_free_image
;
229 status
= efi_parse_options(cmdline_ptr
);
230 if (status
!= EFI_SUCCESS
)
231 pr_efi_err(sys_table
, "Failed to parse EFI cmdline options\n");
234 * Unauthenticated device tree data is a security hazard, so
235 * ignore 'dtb=' unless UEFI Secure Boot is disabled.
237 if (efi_secureboot_enabled(sys_table
)) {
238 pr_efi(sys_table
, "UEFI Secure Boot is enabled.\n");
240 status
= handle_cmdline_files(sys_table
, image
, cmdline_ptr
,
242 ~0UL, (unsigned long *)&fdt_addr
,
243 (unsigned long *)&fdt_size
);
245 if (status
!= EFI_SUCCESS
) {
246 pr_efi_err(sys_table
, "Failed to load device tree!\n");
247 goto fail_free_cmdline
;
251 /* Look for a device tree configuration table entry. */
252 fdt_addr
= (uintptr_t)get_fdt(sys_table
);
254 status
= handle_cmdline_files(sys_table
, image
, cmdline_ptr
,
255 "initrd=", dram_base
+ SZ_512M
,
256 (unsigned long *)&initrd_addr
,
257 (unsigned long *)&initrd_size
);
258 if (status
!= EFI_SUCCESS
)
259 pr_efi_err(sys_table
, "Failed initrd from command line!\n");
261 new_fdt_addr
= fdt_addr
;
262 status
= allocate_new_fdt_and_exit_boot(sys_table
, handle
,
263 &new_fdt_addr
, dram_base
+ MAX_FDT_OFFSET
,
264 initrd_addr
, initrd_size
, cmdline_ptr
,
268 * If all went well, we need to return the FDT address to the
269 * calling function so it can be passed to kernel as part of
270 * the kernel boot protocol.
272 if (status
== EFI_SUCCESS
)
275 pr_efi_err(sys_table
, "Failed to update FDT and exit boot services\n");
277 efi_free(sys_table
, initrd_size
, initrd_addr
);
278 efi_free(sys_table
, fdt_size
, fdt_addr
);
281 efi_free(sys_table
, cmdline_size
, (unsigned long)cmdline_ptr
);
284 efi_free(sys_table
, image_size
, *image_addr
);
285 efi_free(sys_table
, reserve_size
, reserve_addr
);