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.
13 #include <debug_uart.h>
18 #include <linux/err.h>
19 #include <linux/types.h>
24 DECLARE_GLOBAL_DATA_PTR;
26 static struct efi_priv *global_priv;
28 struct efi_system_table *efi_get_sys_table(void)
30 return global_priv->sys_table;
33 unsigned long efi_get_ram_base(void)
35 return global_priv->ram_base;
38 static efi_status_t setup_memory(struct efi_priv *priv)
40 struct efi_boot_services *boot = priv->boot;
41 efi_physical_addr_t addr;
46 * Use global_data_ptr instead of gd since it is an assignment. There
47 * are very few assignments to global_data in U-Boot and this makes
48 * it easier to find them.
50 global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
53 memset(gd, '\0', sizeof(*gd));
55 gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
59 pages = CONFIG_EFI_RAM_SIZE >> 12;
62 * Don't allocate any memory above 4GB. U-Boot is a 32-bit application
63 * so we want it to load below 4GB.
66 ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
67 priv->image_data_type, pages, &addr);
69 printf("(using pool %lx) ", ret);
70 priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
74 priv->use_pool_for_malloc = true;
76 priv->ram_base = addr;
78 gd->ram_size = pages << 12;
83 static void free_memory(struct efi_priv *priv)
85 struct efi_boot_services *boot = priv->boot;
87 if (priv->use_pool_for_malloc)
88 efi_free(priv, (void *)priv->ram_base);
90 boot->free_pages(priv->ram_base, gd->ram_size >> 12);
92 efi_free(priv, (void *)gd->malloc_base);
94 global_data_ptr = NULL;
98 * efi_main() - Start an EFI image
100 * This function is called by our EFI start-up code. It handles running
101 * U-Boot. If it returns, EFI will continue. Another way to get back to EFI
102 * is via reset_cpu().
104 efi_status_t EFIAPI efi_main(efi_handle_t image,
105 struct efi_system_table *sys_table)
107 struct efi_priv local_priv, *priv = &local_priv;
110 /* Set up access to EFI data structures */
111 efi_init(priv, "App", image, sys_table);
116 * Set up the EFI debug UART so that printf() works. This is
117 * implemented in the EFI serial driver, serial_efi.c. The application
118 * can use printf() freely.
122 ret = setup_memory(priv);
124 printf("Failed to set up memory: ret=%lx\n", ret);
128 printf("starting\n");
130 board_init_f(GD_FLG_SKIP_RELOC);
131 board_init_r(NULL, 0);
137 static void efi_exit(void)
139 struct efi_priv *priv = global_priv;
142 printf("U-Boot EFI exiting\n");
143 priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
146 static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
153 static const struct udevice_id efi_sysreset_ids[] = {
154 { .compatible = "efi,reset" },
158 static struct sysreset_ops efi_sysreset_ops = {
159 .request = efi_sysreset_request,
162 U_BOOT_DRIVER(efi_sysreset) = {
163 .name = "efi-sysreset",
164 .id = UCLASS_SYSRESET,
165 .of_match = efi_sysreset_ids,
166 .ops = &efi_sysreset_ops,