upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
u-boot/cmd/bootefi.c

466 lines
12 KiB

/*
* EFI application loader
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <charset.h>
#include <common.h>
#include <command.h>
#include <dm.h>
#include <efi_loader.h>
#include <efi_selftest.h>
#include <errno.h>
#include <libfdt.h>
#include <libfdt_env.h>
#include <memalign.h>
#include <asm/global_data.h>
#include <asm-generic/sections.h>
#include <linux/linkage.h>
DECLARE_GLOBAL_DATA_PTR;
static uint8_t efi_obj_list_initalized;
static struct efi_device_path *bootefi_image_path;
static struct efi_device_path *bootefi_device_path;
/* Initialize and populate EFI object list */
static void efi_init_obj_list(void)
{
efi_obj_list_initalized = 1;
efi_console_register();
#ifdef CONFIG_PARTITIONS
efi_disk_register();
#endif
#if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
efi_gop_register();
#endif
#ifdef CONFIG_NET
efi_net_register();
#endif
#ifdef CONFIG_GENERATE_SMBIOS_TABLE
efi_smbios_register();
#endif
efi_watchdog_register();
/* Initialize EFI runtime services */
efi_reset_system_init();
efi_get_time_init();
}
/*
* Set the load options of an image from an environment variable.
*
* @loaded_image_info: the image
* @env_var: name of the environment variable
*/
static void set_load_options(struct efi_loaded_image *loaded_image_info,
const char *env_var)
{
size_t size;
const char *env = env_get(env_var);
loaded_image_info->load_options = NULL;
loaded_image_info->load_options_size = 0;
if (!env)
return;
size = strlen(env) + 1;
loaded_image_info->load_options = calloc(size, sizeof(u16));
if (!loaded_image_info->load_options) {
printf("ERROR: Out of memory\n");
return;
}
utf8_to_utf16(loaded_image_info->load_options, (u8 *)env, size);
loaded_image_info->load_options_size = size * 2;
}
static void *copy_fdt(void *fdt)
{
u64 fdt_size = fdt_totalsize(fdt);
unsigned long fdt_ram_start = -1L, fdt_pages;
u64 new_fdt_addr;
void *new_fdt;
int i;
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
u64 ram_start = gd->bd->bi_dram[i].start;
u64 ram_size = gd->bd->bi_dram[i].size;
if (!ram_size)
continue;
if (ram_start < fdt_ram_start)
fdt_ram_start = ram_start;
}
/* Give us at least 4kb breathing room */
fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
/* Safe fdt location is at 128MB */
new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
&new_fdt_addr) != EFI_SUCCESS) {
/* If we can't put it there, put it somewhere */
new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
&new_fdt_addr) != EFI_SUCCESS) {
printf("ERROR: Failed to reserve space for FDT\n");
return NULL;
}
}
new_fdt = (void*)(ulong)new_fdt_addr;
memcpy(new_fdt, fdt, fdt_totalsize(fdt));
fdt_set_totalsize(new_fdt, fdt_size);
return new_fdt;
}
static efi_status_t efi_do_enter(
efi_handle_t image_handle, struct efi_system_table *st,
asmlinkage ulong (*entry)(efi_handle_t image_handle,
struct efi_system_table *st))
{
efi_status_t ret = EFI_LOAD_ERROR;
if (entry)
ret = entry(image_handle, st);
st->boottime->exit(image_handle, ret, 0, NULL);
return ret;
}
#ifdef CONFIG_ARM64
static efi_status_t efi_run_in_el2(asmlinkage ulong (*entry)(
efi_handle_t image_handle, struct efi_system_table *st),
efi_handle_t image_handle, struct efi_system_table *st)
{
/* Enable caches again */
dcache_enable();
return efi_do_enter(image_handle, st, entry);
}
#endif
/*
* Load an EFI payload into a newly allocated piece of memory, register all
* EFI objects it would want to access and jump to it.
*/
static efi_status_t do_bootefi_exec(void *efi, void *fdt,
struct efi_device_path *device_path,
struct efi_device_path *image_path)
{
struct efi_loaded_image loaded_image_info = {};
struct efi_object loaded_image_info_obj = {};
struct efi_device_path *memdp = NULL;
ulong ret;
ulong (*entry)(efi_handle_t image_handle, struct efi_system_table *st)
asmlinkage;
ulong fdt_pages, fdt_size, fdt_start, fdt_end;
const efi_guid_t fdt_guid = EFI_FDT_GUID;
bootm_headers_t img = { 0 };
/*
* Special case for efi payload not loaded from disk, such as
* 'bootefi hello' or for example payload loaded directly into
* memory via jtag/etc:
*/
if (!device_path && !image_path) {
printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
/* actual addresses filled in after efi_load_pe() */
memdp = efi_dp_from_mem(0, 0, 0);
device_path = image_path = memdp;
} else {
assert(device_path && image_path);
}
/* Initialize and populate EFI object list */
if (!efi_obj_list_initalized)
efi_init_obj_list();
efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
device_path, image_path);
/*
* gd lives in a fixed register which may get clobbered while we execute
* the payload. So save it here and restore it on every callback entry
*/
efi_save_gd();
if (fdt && !fdt_check_header(fdt)) {
/* Prepare fdt for payload */
fdt = copy_fdt(fdt);
if (image_setup_libfdt(&img, fdt, 0, NULL)) {
printf("ERROR: Failed to process device tree\n");
return -EINVAL;
}
/* Link to it in the efi tables */
efi_install_configuration_table(&fdt_guid, fdt);
/* And reserve the space in the memory map */
fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
/* Give a bootloader the chance to modify the device tree */
fdt_pages += 2;
efi_add_memory_map(fdt_start, fdt_pages,
EFI_BOOT_SERVICES_DATA, true);
} else {
printf("WARNING: Invalid device tree, expect boot to fail\n");
efi_install_configuration_table(&fdt_guid, NULL);
}
/* Transfer environment variable bootargs as load options */
set_load_options(&loaded_image_info, "bootargs");
/* Load the EFI payload */
entry = efi_load_pe(efi, &loaded_image_info);
if (!entry) {
ret = -ENOENT;
goto exit;
}
if (memdp) {
struct efi_device_path_memory *mdp = (void *)memdp;
mdp->memory_type = loaded_image_info.image_code_type;
mdp->start_address = (uintptr_t)loaded_image_info.image_base;
mdp->end_address = mdp->start_address +
loaded_image_info.image_size;
}
efi_loader: efi variable support Add EFI variable support, mapping to u-boot environment variables. Variables are pretty important for setting up boot order, among other things. If the board supports saveenv, then it will be called in ExitBootServices() to persist variables set by the efi payload. (For example, fallback.efi configuring BootOrder and BootXXXX load-option variables.) Variables are *not* currently exposed at runtime, post ExitBootServices. On boards without a dedicated device for storage, which the loaded OS is not trying to also use, this is rather tricky. One idea, at least for boards that can persist RAM across reboot, is to keep a "journal" of modified variables in RAM, and then turn halt into a reboot into u-boot, plus store variables, plus halt. Whatever the solution, it likely involves some per-board support. Mapping between EFI variables and u-boot variables: efi_$guid_$varname = {attributes}(type)value For example: efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported= "{ro,boot,run}(blob)0000000000000000" efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_BootOrder= "(blob)00010000" The attributes are a comma separated list of these possible attributes: + ro - read-only + boot - boot-services access + run - runtime access NOTE: with current implementation, no variables are available after ExitBootServices, and all are persisted (if possible). If not specified, the attributes default to "{boot}". The required type is one of: + utf8 - raw utf8 string + blob - arbitrary length hex string Signed-off-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Alexander Graf <agraf@suse.de>
7 years ago
/* we don't support much: */
env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
"{ro,boot}(blob)0000000000000000");
/* Call our payload! */
debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
if (setjmp(&loaded_image_info.exit_jmp)) {
ret = loaded_image_info.exit_status;
goto exit;
}
#ifdef CONFIG_ARM64
/* On AArch64 we need to make sure we call our payload in < EL3 */
if (current_el() == 3) {
smp_kick_all_cpus();
dcache_disable(); /* flush cache before switch to EL2 */
/* Move into EL2 and keep running there */
armv8_switch_to_el2((ulong)entry,
(ulong)&loaded_image_info_obj.handle,
(ulong)&systab, 0, (ulong)efi_run_in_el2,
ES_TO_AARCH64);
/* Should never reach here, efi exits with longjmp */
while (1) { }
}
#endif
ret = efi_do_enter(loaded_image_info_obj.handle, &systab, entry);
exit:
/* image has returned, loaded-image obj goes *poof*: */
list_del(&loaded_image_info_obj.link);
return ret;
}
static int do_bootefi_bootmgr_exec(unsigned long fdt_addr)
{
struct efi_device_path *device_path, *file_path;
void *addr;
efi_status_t r;
/* Initialize and populate EFI object list */
if (!efi_obj_list_initalized)
efi_init_obj_list();
/*
* gd lives in a fixed register which may get clobbered while we execute
* the payload. So save it here and restore it on every callback entry
*/
efi_save_gd();
addr = efi_bootmgr_load(&device_path, &file_path);
if (!addr)
return 1;
printf("## Starting EFI application at %p ...\n", addr);
r = do_bootefi_exec(addr, (void *)fdt_addr, device_path, file_path);
printf("## Application terminated, r = %lu\n",
r & ~EFI_ERROR_MASK);
if (r != EFI_SUCCESS)
return 1;
return 0;
}
/* Interpreter command to boot an arbitrary EFI image from memory */
static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char *saddr, *sfdt;
unsigned long addr, fdt_addr = 0;
efi_status_t r;
if (argc < 2)
return CMD_RET_USAGE;
#ifdef CONFIG_CMD_BOOTEFI_HELLO
if (!strcmp(argv[1], "hello")) {
ulong size = __efi_helloworld_end - __efi_helloworld_begin;
saddr = env_get("loadaddr");
if (saddr)
addr = simple_strtoul(saddr, NULL, 16);
else
addr = CONFIG_SYS_LOAD_ADDR;
memcpy((char *)addr, __efi_helloworld_begin, size);
} else
#endif
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
if (!strcmp(argv[1], "selftest")) {
struct efi_loaded_image loaded_image_info = {};
struct efi_object loaded_image_info_obj = {};
/* Construct a dummy device path. */
bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
(uintptr_t)&efi_selftest,
(uintptr_t)&efi_selftest);
bootefi_image_path = efi_dp_from_file(NULL, 0, "\\selftest");
efi_setup_loaded_image(&loaded_image_info,
&loaded_image_info_obj,
bootefi_device_path, bootefi_image_path);
/*
* gd lives in a fixed register which may get clobbered while we
* execute the payload. So save it here and restore it on every
* callback entry
*/
efi_save_gd();
/* Initialize and populate EFI object list */
if (!efi_obj_list_initalized)
efi_init_obj_list();
/* Transfer environment variable efi_selftest as load options */
set_load_options(&loaded_image_info, "efi_selftest");
/* Execute the test */
r = efi_selftest(loaded_image_info_obj.handle, &systab);
efi_restore_gd();
free(loaded_image_info.load_options);
list_del(&loaded_image_info_obj.link);
return r != EFI_SUCCESS;
} else
#endif
if (!strcmp(argv[1], "bootmgr")) {
unsigned long fdt_addr = 0;
if (argc > 2)
fdt_addr = simple_strtoul(argv[2], NULL, 16);
return do_bootefi_bootmgr_exec(fdt_addr);
} else {
saddr = argv[1];
addr = simple_strtoul(saddr, NULL, 16);
if (argc > 2) {
sfdt = argv[2];
fdt_addr = simple_strtoul(sfdt, NULL, 16);
}
}
printf("## Starting EFI application at %08lx ...\n", addr);
r = do_bootefi_exec((void *)addr, (void *)fdt_addr,
bootefi_device_path, bootefi_image_path);
printf("## Application terminated, r = %lu\n",
r & ~EFI_ERROR_MASK);
if (r != EFI_SUCCESS)
return 1;
else
return 0;
}
#ifdef CONFIG_SYS_LONGHELP
static char bootefi_help_text[] =
"<image address> [fdt address]\n"
" - boot EFI payload stored at address <image address>.\n"
" If specified, the device tree located at <fdt address> gets\n"
" exposed as EFI configuration table.\n"
#ifdef CONFIG_CMD_BOOTEFI_HELLO
"bootefi hello\n"
" - boot a sample Hello World application stored within U-Boot\n"
#endif
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
"bootefi selftest\n"
" - boot an EFI selftest application stored within U-Boot\n"
" Use environment variable efi_selftest to select a single test.\n"
" Use 'setenv efi_selftest list' to enumerate all tests.\n"
#endif
"bootmgr [fdt addr]\n"
" - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
"\n"
" If specified, the device tree located at <fdt address> gets\n"
" exposed as EFI configuration table.\n";
#endif
U_BOOT_CMD(
bootefi, 3, 0, do_bootefi,
"Boots an EFI payload from memory",
bootefi_help_text
);
static int parse_partnum(const char *devnr)
{
const char *str = strchr(devnr, ':');
if (str) {
str++;
return simple_strtoul(str, NULL, 16);
}
return 0;
}
void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
{
char filename[32] = { 0 }; /* dp->str is u16[32] long */
char *s;
if (strcmp(dev, "Net")) {
struct blk_desc *desc;
int part;
desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
if (!desc)
return;
part = parse_partnum(devnr);
bootefi_device_path = efi_dp_from_part(desc, part);
} else {
#ifdef CONFIG_NET
bootefi_device_path = efi_dp_from_eth();
#endif
}
if (!path)
return;
if (strcmp(dev, "Net")) {
/* Add leading / to fs paths, because they're absolute */
snprintf(filename, sizeof(filename), "/%s", path);
} else {
snprintf(filename, sizeof(filename), "%s", path);
}
/* DOS style file path: */
s = filename;
while ((s = strchr(s, '/')))
*s++ = '\\';
bootefi_image_path = efi_dp_from_file(NULL, 0, filename);
}