u-boot/cmd/bootefi.c
Rob Clark 7dd5d44753 efi_loader: fix efi_exit
efi_exit() already restores gd, so we shouldn't EFI_EXIT() on the
otherside of the longjmp().

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2017-09-21 09:04:25 +02:00

393 lines
10 KiB
C

/*
* EFI application loader
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <efi_loader.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
/* Initialize EFI runtime services */
efi_reset_system_init();
efi_get_time_init();
}
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 ulong efi_do_enter(void *image_handle,
struct efi_system_table *st,
asmlinkage ulong (*entry)(void *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 unsigned long efi_run_in_el2(asmlinkage ulong (*entry)(
void *image_handle, struct efi_system_table *st),
void *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 unsigned long 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 = {};
ulong ret;
ulong (*entry)(void *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 };
/* 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);
}
/* Load the EFI payload */
entry = efi_load_pe(efi, &loaded_image_info);
if (!entry) {
ret = -ENOENT;
goto exit;
}
/* 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,
(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, &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;
unsigned long 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 = {};
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();
return efi_selftest(&loaded_image_info, &systab);
} 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"
#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));
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);
}