efi_app.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
*
* EFI information obtained here:
* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
*
* This file implements U-Boot running as an EFI application.
*/
#include <common.h>
#include <debug_uart.h>
#include <dm.h>
#include <errno.h>
#include <linux/err.h>
#include <linux/types.h>
#include <efi.h>
#include <efi_api.h>
#include <sysreset.h>
DECLARE_GLOBAL_DATA_PTR;
static struct efi_priv *global_priv;
struct efi_system_table *efi_get_sys_table(void)
{
return global_priv->sys_table;
}
unsigned long efi_get_ram_base(void)
{
return global_priv->ram_base;
}
static efi_status_t setup_memory(struct efi_priv *priv)
{
struct efi_boot_services *boot = priv->boot;
efi_physical_addr_t addr;
efi_status_t ret;
int pages;
/*
* Use global_data_ptr instead of gd since it is an assignment. There
* are very few assignments to global_data in U-Boot and this makes
* it easier to find them.
*/
global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
if (!global_data_ptr)
return ret;
memset(gd, '\0', sizeof(*gd));
gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
&ret);
if (!gd->malloc_base)
return ret;
pages = CONFIG_EFI_RAM_SIZE >> 12;
/*
* Don't allocate any memory above 4GB. U-Boot is a 32-bit application
* so we want it to load below 4GB.
*/
addr = 1ULL << 32;
ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
priv->image_data_type, pages, &addr);
if (ret) {
printf("(using pool %lx) ", ret);
priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
&ret);
if (!priv->ram_base)
return ret;
priv->use_pool_for_malloc = true;
} else {
priv->ram_base = addr;
}
gd->ram_size = pages << 12;
return 0;
}
static void free_memory(struct efi_priv *priv)
{
struct efi_boot_services *boot = priv->boot;
if (priv->use_pool_for_malloc)
efi_free(priv, (void *)priv->ram_base);
else
boot->free_pages(priv->ram_base, gd->ram_size >> 12);
efi_free(priv, (void *)gd->malloc_base);
efi_free(priv, gd);
global_data_ptr = NULL;
}
/**
* efi_main() - Start an EFI image
*
* This function is called by our EFI start-up code. It handles running
* U-Boot. If it returns, EFI will continue. Another way to get back to EFI
* is via reset_cpu().
*/
efi_status_t EFIAPI efi_main(efi_handle_t image,
struct efi_system_table *sys_table)
{
struct efi_priv local_priv, *priv = &local_priv;
efi_status_t ret;
/* Set up access to EFI data structures */
efi_init(priv, "App", image, sys_table);
global_priv = priv;
/*
* Set up the EFI debug UART so that printf() works. This is
* implemented in the EFI serial driver, serial_efi.c. The application
* can use printf() freely.
*/
debug_uart_init();
ret = setup_memory(priv);
if (ret) {
printf("Failed to set up memory: ret=%lx\n", ret);
return ret;
}
printf("starting\n");
board_init_f(GD_FLG_SKIP_RELOC);
board_init_r(NULL, 0);
free_memory(priv);
return EFI_SUCCESS;
}
static void efi_exit(void)
{
struct efi_priv *priv = global_priv;
free_memory(priv);
printf("U-Boot EFI exiting\n");
priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
}
static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
efi_exit();
return -EINPROGRESS;
}
static const struct udevice_id efi_sysreset_ids[] = {
{ .compatible = "efi,reset" },
{ }
};
static struct sysreset_ops efi_sysreset_ops = {
.request = efi_sysreset_request,
};
U_BOOT_DRIVER(efi_sysreset) = {
.name = "efi-sysreset",
.id = UCLASS_SYSRESET,
.of_match = efi_sysreset_ids,
.ops = &efi_sysreset_ops,
};