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https://github.com/smaeul/u-boot.git
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867a6ac86d
When running as an EFI application, U-Boot must request memory from EFI, and provide access to the boot services U-Boot needs. Add library code to perform these tasks. This includes efi_main() which is the entry point from EFI. U-Boot is built as a shared library. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
140 lines
3.1 KiB
C
140 lines
3.1 KiB
C
/*
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* Copyright (c) 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* EFI information obtained here:
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* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
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*
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* This file implements U-Boot running as an EFI application.
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*/
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#include <common.h>
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#include <debug_uart.h>
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#include <errno.h>
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#include <linux/err.h>
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#include <linux/types.h>
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#include <efi.h>
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#include <efi_api.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct efi_priv *global_priv;
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struct efi_system_table *efi_get_sys_table(void)
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{
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return global_priv->sys_table;
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}
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unsigned long efi_get_ram_base(void)
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{
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return global_priv->ram_base;
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}
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static efi_status_t setup_memory(struct efi_priv *priv)
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{
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struct efi_boot_services *boot = priv->boot;
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efi_physical_addr_t addr;
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efi_status_t ret;
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int pages;
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/*
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* Use global_data_ptr instead of gd since it is an assignment. There
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* are very few assignments to global_data in U-Boot and this makes
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* it easier to find them.
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*/
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global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
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if (!global_data_ptr)
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return ret;
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memset(gd, '\0', sizeof(*gd));
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gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_SYS_MALLOC_F_LEN,
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&ret);
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if (!gd->malloc_base)
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return ret;
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pages = CONFIG_EFI_RAM_SIZE >> 12;
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/*
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* Don't allocate any memory above 4GB. U-Boot is a 32-bit application
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* so we want it to load below 4GB.
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*/
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addr = 1ULL << 32;
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ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
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priv->image_data_type, pages, &addr);
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if (ret) {
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printf("(using pool %lx) ", ret);
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priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
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&ret);
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if (!priv->ram_base)
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return ret;
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priv->use_pool_for_malloc = true;
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} else {
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priv->ram_base = addr;
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}
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gd->ram_size = pages << 12;
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return 0;
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}
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static void free_memory(struct efi_priv *priv)
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{
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struct efi_boot_services *boot = priv->boot;
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if (priv->use_pool_for_malloc)
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efi_free(priv, (void *)priv->ram_base);
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else
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boot->free_pages(priv->ram_base, gd->ram_size >> 12);
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efi_free(priv, (void *)gd->malloc_base);
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efi_free(priv, gd);
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global_data_ptr = NULL;
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}
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/**
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* efi_main() - Start an EFI image
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*
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* This function is called by our EFI start-up code. It handles running
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* U-Boot. If it returns, EFI will continue. Another way to get back to EFI
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* is via reset_cpu().
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*/
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efi_status_t efi_main(efi_handle_t image, struct efi_system_table *sys_table)
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{
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struct efi_priv local_priv, *priv = &local_priv;
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efi_status_t ret;
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/* Set up access to EFI data structures */
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efi_init(priv, "App", image, sys_table);
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global_priv = priv;
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/*
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* Set up the EFI debug UART so that printf() works. This is
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* implemented in the EFI serial driver, serial_efi.c. The application
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* can use printf() freely.
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*/
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debug_uart_init();
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ret = setup_memory(priv);
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if (ret) {
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printf("Failed to set up memory: ret=%lx\n", ret);
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return ret;
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}
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printf("starting\n");
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board_init_f(GD_FLG_SKIP_RELOC);
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board_init_r(NULL, 0);
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free_memory(priv);
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return EFI_SUCCESS;
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}
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void reset_cpu(ulong addr)
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{
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struct efi_priv *priv = global_priv;
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free_memory(priv);
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printf("U-Boot EFI exiting\n");
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priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
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}
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