1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2015 Google, Inc
5 * EFI information obtained here:
6 * http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
8 * This file implements U-Boot running as an EFI application.
12 #include <debug_uart.h>
15 #include <linux/err.h>
16 #include <linux/types.h>
21 DECLARE_GLOBAL_DATA_PTR;
23 static struct efi_priv *global_priv;
25 struct efi_system_table *efi_get_sys_table(void)
27 return global_priv->sys_table;
30 unsigned long efi_get_ram_base(void)
32 return global_priv->ram_base;
35 static efi_status_t setup_memory(struct efi_priv *priv)
37 struct efi_boot_services *boot = priv->boot;
38 efi_physical_addr_t addr;
43 * Use global_data_ptr instead of gd since it is an assignment. There
44 * are very few assignments to global_data in U-Boot and this makes
45 * it easier to find them.
47 global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
50 memset(gd, '\0', sizeof(*gd));
52 gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
56 pages = CONFIG_EFI_RAM_SIZE >> 12;
59 * Don't allocate any memory above 4GB. U-Boot is a 32-bit application
60 * so we want it to load below 4GB.
63 ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
64 priv->image_data_type, pages, &addr);
66 printf("(using pool %lx) ", ret);
67 priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
71 priv->use_pool_for_malloc = true;
73 priv->ram_base = addr;
75 gd->ram_size = pages << 12;
80 static void free_memory(struct efi_priv *priv)
82 struct efi_boot_services *boot = priv->boot;
84 if (priv->use_pool_for_malloc)
85 efi_free(priv, (void *)priv->ram_base);
87 boot->free_pages(priv->ram_base, gd->ram_size >> 12);
89 efi_free(priv, (void *)gd->malloc_base);
91 global_data_ptr = NULL;
95 * efi_main() - Start an EFI image
97 * This function is called by our EFI start-up code. It handles running
98 * U-Boot. If it returns, EFI will continue. Another way to get back to EFI
101 efi_status_t EFIAPI efi_main(efi_handle_t image,
102 struct efi_system_table *sys_table)
104 struct efi_priv local_priv, *priv = &local_priv;
107 /* Set up access to EFI data structures */
108 efi_init(priv, "App", image, sys_table);
113 * Set up the EFI debug UART so that printf() works. This is
114 * implemented in the EFI serial driver, serial_efi.c. The application
115 * can use printf() freely.
119 ret = setup_memory(priv);
121 printf("Failed to set up memory: ret=%lx\n", ret);
125 printf("starting\n");
127 board_init_f(GD_FLG_SKIP_RELOC);
128 board_init_r(NULL, 0);
134 static void efi_exit(void)
136 struct efi_priv *priv = global_priv;
139 printf("U-Boot EFI exiting\n");
140 priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
143 static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
150 static const struct udevice_id efi_sysreset_ids[] = {
151 { .compatible = "efi,reset" },
155 static struct sysreset_ops efi_sysreset_ops = {
156 .request = efi_sysreset_request,
159 U_BOOT_DRIVER(efi_sysreset) = {
160 .name = "efi-sysreset",
161 .id = UCLASS_SYSRESET,
162 .of_match = efi_sysreset_ids,
163 .ops = &efi_sysreset_ops,