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![Bin Meng](/assets/img/avatar_default.png)
ACPI tables can be passed via EFI configuration table to an EFI application. This is only supported on x86 so far. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
560 lines
14 KiB
C
560 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI application loader
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*
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* Copyright (c) 2016 Alexander Graf
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*/
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#include <charset.h>
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <efi_loader.h>
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#include <efi_selftest.h>
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#include <errno.h>
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#include <linux/libfdt.h>
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#include <linux/libfdt_env.h>
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#include <memalign.h>
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#include <asm/global_data.h>
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#include <asm-generic/sections.h>
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#include <asm-generic/unaligned.h>
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#include <linux/linkage.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define OBJ_LIST_NOT_INITIALIZED 1
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static efi_status_t efi_obj_list_initialized = OBJ_LIST_NOT_INITIALIZED;
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static struct efi_device_path *bootefi_image_path;
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static struct efi_device_path *bootefi_device_path;
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/* Initialize and populate EFI object list */
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efi_status_t efi_init_obj_list(void)
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{
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efi_status_t ret = EFI_SUCCESS;
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/* Initialize once only */
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if (efi_obj_list_initialized != OBJ_LIST_NOT_INITIALIZED)
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return efi_obj_list_initialized;
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/* Initialize EFI driver uclass */
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ret = efi_driver_init();
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if (ret != EFI_SUCCESS)
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goto out;
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ret = efi_console_register();
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if (ret != EFI_SUCCESS)
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goto out;
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#ifdef CONFIG_PARTITIONS
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ret = efi_disk_register();
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if (ret != EFI_SUCCESS)
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goto out;
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#endif
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#if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
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ret = efi_gop_register();
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if (ret != EFI_SUCCESS)
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goto out;
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#endif
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#ifdef CONFIG_NET
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ret = efi_net_register();
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if (ret != EFI_SUCCESS)
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goto out;
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#endif
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#ifdef CONFIG_GENERATE_ACPI_TABLE
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ret = efi_acpi_register();
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if (ret != EFI_SUCCESS)
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goto out;
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#endif
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#ifdef CONFIG_GENERATE_SMBIOS_TABLE
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ret = efi_smbios_register();
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if (ret != EFI_SUCCESS)
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goto out;
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#endif
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ret = efi_watchdog_register();
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if (ret != EFI_SUCCESS)
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goto out;
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/* Initialize EFI runtime services */
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ret = efi_reset_system_init();
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if (ret != EFI_SUCCESS)
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goto out;
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ret = efi_get_time_init();
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if (ret != EFI_SUCCESS)
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goto out;
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out:
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efi_obj_list_initialized = ret;
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return ret;
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}
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/*
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* Allow unaligned memory access.
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*
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* This routine is overridden by architectures providing this feature.
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*/
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void __weak allow_unaligned(void)
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{
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}
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/*
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* Set the load options of an image from an environment variable.
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*
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* @loaded_image_info: the image
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* @env_var: name of the environment variable
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*/
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static void set_load_options(struct efi_loaded_image *loaded_image_info,
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const char *env_var)
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{
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size_t size;
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const char *env = env_get(env_var);
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loaded_image_info->load_options = NULL;
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loaded_image_info->load_options_size = 0;
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if (!env)
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return;
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size = strlen(env) + 1;
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loaded_image_info->load_options = calloc(size, sizeof(u16));
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if (!loaded_image_info->load_options) {
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printf("ERROR: Out of memory\n");
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return;
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}
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utf8_to_utf16(loaded_image_info->load_options, (u8 *)env, size);
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loaded_image_info->load_options_size = size * 2;
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}
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static void *copy_fdt(void *fdt)
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{
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u64 fdt_size = fdt_totalsize(fdt);
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unsigned long fdt_ram_start = -1L, fdt_pages;
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u64 new_fdt_addr;
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void *new_fdt;
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int i;
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
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u64 ram_start = gd->bd->bi_dram[i].start;
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u64 ram_size = gd->bd->bi_dram[i].size;
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if (!ram_size)
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continue;
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if (ram_start < fdt_ram_start)
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fdt_ram_start = ram_start;
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}
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/* Give us at least 4kb breathing room */
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fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
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fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
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/* Safe fdt location is at 128MB */
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new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
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if (efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
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EFI_RUNTIME_SERVICES_DATA, fdt_pages,
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&new_fdt_addr) != EFI_SUCCESS) {
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/* If we can't put it there, put it somewhere */
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new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
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if (efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
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EFI_RUNTIME_SERVICES_DATA, fdt_pages,
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&new_fdt_addr) != EFI_SUCCESS) {
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printf("ERROR: Failed to reserve space for FDT\n");
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return NULL;
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}
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}
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new_fdt = (void*)(ulong)new_fdt_addr;
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memcpy(new_fdt, fdt, fdt_totalsize(fdt));
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fdt_set_totalsize(new_fdt, fdt_size);
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return new_fdt;
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}
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static efi_status_t efi_do_enter(
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efi_handle_t image_handle, struct efi_system_table *st,
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EFIAPI efi_status_t (*entry)(
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efi_handle_t image_handle,
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struct efi_system_table *st))
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{
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efi_status_t ret = EFI_LOAD_ERROR;
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if (entry)
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ret = entry(image_handle, st);
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st->boottime->exit(image_handle, ret, 0, NULL);
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return ret;
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}
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#ifdef CONFIG_ARM64
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static efi_status_t efi_run_in_el2(EFIAPI efi_status_t (*entry)(
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efi_handle_t image_handle, struct efi_system_table *st),
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efi_handle_t image_handle, struct efi_system_table *st)
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{
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/* Enable caches again */
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dcache_enable();
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return efi_do_enter(image_handle, st, entry);
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}
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#endif
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/* Carve out DT reserved memory ranges */
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static efi_status_t efi_carve_out_dt_rsv(void *fdt)
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{
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int nr_rsv, i;
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uint64_t addr, size, pages;
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nr_rsv = fdt_num_mem_rsv(fdt);
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/* Look for an existing entry and add it to the efi mem map. */
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for (i = 0; i < nr_rsv; i++) {
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if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
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continue;
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pages = ALIGN(size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT;
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efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
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false);
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}
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return EFI_SUCCESS;
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}
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static efi_status_t efi_install_fdt(void *fdt)
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{
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bootm_headers_t img = { 0 };
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ulong fdt_pages, fdt_size, fdt_start, fdt_end;
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efi_status_t ret;
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if (fdt_check_header(fdt)) {
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printf("ERROR: invalid device tree\n");
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return EFI_INVALID_PARAMETER;
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}
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/* Prepare fdt for payload */
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fdt = copy_fdt(fdt);
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if (!fdt)
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return EFI_OUT_OF_RESOURCES;
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if (image_setup_libfdt(&img, fdt, 0, NULL)) {
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printf("ERROR: failed to process device tree\n");
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return EFI_LOAD_ERROR;
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}
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if (efi_carve_out_dt_rsv(fdt) != EFI_SUCCESS) {
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printf("ERROR: failed to carve out memory\n");
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return EFI_LOAD_ERROR;
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}
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/* Link to it in the efi tables */
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ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
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if (ret != EFI_SUCCESS)
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return EFI_OUT_OF_RESOURCES;
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/* And reserve the space in the memory map */
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fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
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fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
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fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
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fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
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/* Give a bootloader the chance to modify the device tree */
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fdt_pages += 2;
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ret = efi_add_memory_map(fdt_start, fdt_pages,
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EFI_BOOT_SERVICES_DATA, true);
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return ret;
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}
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/*
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* Load an EFI payload into a newly allocated piece of memory, register all
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* EFI objects it would want to access and jump to it.
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*/
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static efi_status_t do_bootefi_exec(void *efi,
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struct efi_device_path *device_path,
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struct efi_device_path *image_path)
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{
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struct efi_loaded_image loaded_image_info = {};
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struct efi_object loaded_image_info_obj = {};
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struct efi_object mem_obj = {};
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struct efi_device_path *memdp = NULL;
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efi_status_t ret;
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EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
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struct efi_system_table *st);
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/*
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* Special case for efi payload not loaded from disk, such as
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* 'bootefi hello' or for example payload loaded directly into
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* memory via jtag/etc:
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*/
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if (!device_path && !image_path) {
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printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
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/* actual addresses filled in after efi_load_pe() */
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memdp = efi_dp_from_mem(0, 0, 0);
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device_path = image_path = memdp;
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efi_add_handle(&mem_obj);
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ret = efi_add_protocol(mem_obj.handle, &efi_guid_device_path,
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device_path);
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if (ret != EFI_SUCCESS)
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goto exit;
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} else {
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assert(device_path && image_path);
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}
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efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
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device_path, image_path);
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/*
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* gd lives in a fixed register which may get clobbered while we execute
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* the payload. So save it here and restore it on every callback entry
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*/
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efi_save_gd();
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/* Transfer environment variable bootargs as load options */
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set_load_options(&loaded_image_info, "bootargs");
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/* Load the EFI payload */
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entry = efi_load_pe(efi, &loaded_image_info);
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if (!entry) {
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ret = EFI_LOAD_ERROR;
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goto exit;
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}
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if (memdp) {
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struct efi_device_path_memory *mdp = (void *)memdp;
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mdp->memory_type = loaded_image_info.image_code_type;
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mdp->start_address = (uintptr_t)loaded_image_info.image_base;
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mdp->end_address = mdp->start_address +
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loaded_image_info.image_size;
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}
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/* we don't support much: */
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env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
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"{ro,boot}(blob)0000000000000000");
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/* Call our payload! */
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debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
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if (setjmp(&loaded_image_info.exit_jmp)) {
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ret = loaded_image_info.exit_status;
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goto exit;
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}
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#ifdef CONFIG_ARM64
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/* On AArch64 we need to make sure we call our payload in < EL3 */
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if (current_el() == 3) {
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smp_kick_all_cpus();
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dcache_disable(); /* flush cache before switch to EL2 */
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/* Move into EL2 and keep running there */
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armv8_switch_to_el2((ulong)entry,
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(ulong)&loaded_image_info_obj.handle,
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(ulong)&systab, 0, (ulong)efi_run_in_el2,
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ES_TO_AARCH64);
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/* Should never reach here, efi exits with longjmp */
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while (1) { }
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}
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#endif
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ret = efi_do_enter(loaded_image_info_obj.handle, &systab, entry);
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exit:
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/* image has returned, loaded-image obj goes *poof*: */
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list_del(&loaded_image_info_obj.link);
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if (mem_obj.handle)
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list_del(&mem_obj.link);
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return ret;
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}
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static int do_bootefi_bootmgr_exec(void)
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{
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struct efi_device_path *device_path, *file_path;
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void *addr;
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efi_status_t r;
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/*
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* gd lives in a fixed register which may get clobbered while we execute
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* the payload. So save it here and restore it on every callback entry
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*/
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efi_save_gd();
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addr = efi_bootmgr_load(&device_path, &file_path);
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if (!addr)
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return 1;
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printf("## Starting EFI application at %p ...\n", addr);
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r = do_bootefi_exec(addr, device_path, file_path);
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printf("## Application terminated, r = %lu\n",
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r & ~EFI_ERROR_MASK);
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if (r != EFI_SUCCESS)
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return 1;
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return 0;
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}
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/* Interpreter command to boot an arbitrary EFI image from memory */
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static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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unsigned long addr;
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char *saddr;
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efi_status_t r;
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void *fdt_addr;
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/* Allow unaligned memory access */
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allow_unaligned();
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/* Initialize EFI drivers */
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r = efi_init_obj_list();
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if (r != EFI_SUCCESS) {
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printf("Error: Cannot set up EFI drivers, r = %lu\n",
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r & ~EFI_ERROR_MASK);
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return CMD_RET_FAILURE;
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}
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if (argc < 2)
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return CMD_RET_USAGE;
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if (argc > 2) {
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fdt_addr = (void *)simple_strtoul(argv[2], NULL, 16);
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if (!fdt_addr && *argv[2] != '0')
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return CMD_RET_USAGE;
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/* Install device tree */
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r = efi_install_fdt(fdt_addr);
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if (r != EFI_SUCCESS) {
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printf("ERROR: failed to install device tree\n");
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return CMD_RET_FAILURE;
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}
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} else {
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/* Remove device tree. EFI_NOT_FOUND can be ignored here */
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efi_install_configuration_table(&efi_guid_fdt, NULL);
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printf("WARNING: booting without device tree\n");
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}
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#ifdef CONFIG_CMD_BOOTEFI_HELLO
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if (!strcmp(argv[1], "hello")) {
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ulong size = __efi_helloworld_end - __efi_helloworld_begin;
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saddr = env_get("loadaddr");
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if (saddr)
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addr = simple_strtoul(saddr, NULL, 16);
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else
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addr = CONFIG_SYS_LOAD_ADDR;
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memcpy((char *)addr, __efi_helloworld_begin, size);
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} else
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#endif
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#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
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if (!strcmp(argv[1], "selftest")) {
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struct efi_loaded_image loaded_image_info = {};
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struct efi_object loaded_image_info_obj = {};
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/* Construct a dummy device path. */
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bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
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(uintptr_t)&efi_selftest,
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(uintptr_t)&efi_selftest);
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bootefi_image_path = efi_dp_from_file(NULL, 0, "\\selftest");
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efi_setup_loaded_image(&loaded_image_info,
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&loaded_image_info_obj,
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bootefi_device_path, bootefi_image_path);
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/*
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* gd lives in a fixed register which may get clobbered while we
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* execute the payload. So save it here and restore it on every
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* callback entry
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*/
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efi_save_gd();
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/* Transfer environment variable efi_selftest as load options */
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set_load_options(&loaded_image_info, "efi_selftest");
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/* Execute the test */
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r = efi_selftest(loaded_image_info_obj.handle, &systab);
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efi_restore_gd();
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free(loaded_image_info.load_options);
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list_del(&loaded_image_info_obj.link);
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return r != EFI_SUCCESS;
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} else
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#endif
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if (!strcmp(argv[1], "bootmgr")) {
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return do_bootefi_bootmgr_exec();
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} else {
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saddr = argv[1];
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addr = simple_strtoul(saddr, NULL, 16);
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/* Check that a numeric value was passed */
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if (!addr && *saddr != '0')
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return CMD_RET_USAGE;
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}
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printf("## Starting EFI application at %08lx ...\n", addr);
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r = do_bootefi_exec((void *)addr, bootefi_device_path,
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bootefi_image_path);
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printf("## Application terminated, r = %lu\n",
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r & ~EFI_ERROR_MASK);
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if (r != EFI_SUCCESS)
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return 1;
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else
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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 [fdt address]\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
|
|
"bootefi 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
|
|
);
|
|
|
|
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;
|
|
disk_partition_t fs_partition;
|
|
int part;
|
|
|
|
part = blk_get_device_part_str(dev, devnr, &desc, &fs_partition,
|
|
1);
|
|
if (part < 0)
|
|
return;
|
|
|
|
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);
|
|
}
|