mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 19:10:13 +00:00
866e2ac5aa
At present this code is inline in the app and stub. But they do the same thing. The difference is that the stub does it immediately and the app doesn't want to do it until the end (when it boots a kernel) or not at all, if returning to UEFI. Move it into a function so it can be called as needed. Add a comment showing how to store the memory map so that it can be accessed within the app if needed, for debugging purposes only. The map can change without notice. Signed-off-by: Simon Glass <sjg@chromium.org>
209 lines
4.9 KiB
C
209 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Functions shared by the app and stub
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*
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* Copyright (c) 2015 Google, Inc
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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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* Common EFI functions
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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 <malloc.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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static struct efi_priv *global_priv;
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struct efi_priv *efi_get_priv(void)
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{
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return global_priv;
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}
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void efi_set_priv(struct efi_priv *priv)
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{
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global_priv = priv;
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}
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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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struct efi_boot_services *efi_get_boot(void)
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{
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return global_priv->boot;
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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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/*
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* Global declaration of gd.
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*
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* As we write to it before relocation we have to make sure it is not put into
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* a .bss section which may overlap a .rela section. Initialization forces it
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* into a .data section which cannot overlap any .rela section.
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*/
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struct global_data *global_data_ptr = (struct global_data *)~0;
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/*
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* Unfortunately we cannot access any code outside what is built especially
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* for the stub. lib/string.c is already being built for the U-Boot payload
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* so it uses the wrong compiler flags. Add our own memset() here.
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*/
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static void efi_memset(void *ptr, int ch, int size)
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{
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char *dest = ptr;
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while (size-- > 0)
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*dest++ = ch;
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}
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/*
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* Since the EFI stub cannot access most of the U-Boot code, add our own
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* simple console output functions here. The EFI app will not use these since
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* it can use the normal console.
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*/
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void efi_putc(struct efi_priv *priv, const char ch)
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{
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struct efi_simple_text_output_protocol *con = priv->sys_table->con_out;
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uint16_t ucode[2];
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ucode[0] = ch;
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ucode[1] = '\0';
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con->output_string(con, ucode);
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}
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void efi_puts(struct efi_priv *priv, const char *str)
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{
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while (*str)
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efi_putc(priv, *str++);
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}
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int efi_init(struct efi_priv *priv, const char *banner, efi_handle_t image,
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struct efi_system_table *sys_table)
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{
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efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
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struct efi_boot_services *boot = sys_table->boottime;
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struct efi_loaded_image *loaded_image;
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int ret;
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efi_memset(priv, '\0', sizeof(*priv));
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priv->sys_table = sys_table;
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priv->boot = sys_table->boottime;
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priv->parent_image = image;
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priv->run = sys_table->runtime;
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efi_puts(priv, "U-Boot EFI ");
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efi_puts(priv, banner);
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efi_putc(priv, ' ');
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ret = boot->open_protocol(priv->parent_image, &loaded_image_guid,
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(void **)&loaded_image, priv->parent_image,
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NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (ret) {
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efi_puts(priv, "Failed to get loaded image protocol\n");
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return ret;
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}
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priv->image_data_type = loaded_image->image_data_type;
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return 0;
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}
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void *efi_malloc(struct efi_priv *priv, int size, efi_status_t *retp)
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{
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struct efi_boot_services *boot = priv->boot;
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void *buf = NULL;
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*retp = boot->allocate_pool(priv->image_data_type, size, &buf);
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return buf;
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}
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void efi_free(struct efi_priv *priv, void *ptr)
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{
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struct efi_boot_services *boot = priv->boot;
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boot->free_pool(ptr);
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}
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int efi_store_memory_map(struct efi_priv *priv)
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{
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struct efi_boot_services *boot = priv->sys_table->boottime;
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efi_uintn_t size, desc_size;
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efi_status_t ret;
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/* Get the memory map so we can switch off EFI */
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size = 0;
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ret = boot->get_memory_map(&size, NULL, &priv->memmap_key,
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&priv->memmap_desc_size,
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&priv->memmap_version);
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if (ret != EFI_BUFFER_TOO_SMALL) {
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/*
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* Note this function avoids using printf() since it is not
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* available in the stub
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*/
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printhex2(EFI_BITS_PER_LONG);
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putc(' ');
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printhex2(ret);
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puts(" No memory map\n");
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return ret;
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}
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/*
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* Since doing a malloc() may change the memory map and also we want to
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* be able to read the memory map in efi_call_exit_boot_services()
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* below, after more changes have happened
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*/
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priv->memmap_alloc = size + 1024;
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priv->memmap_size = priv->memmap_alloc;
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priv->memmap_desc = efi_malloc(priv, size, &ret);
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if (!priv->memmap_desc) {
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printhex2(ret);
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puts(" No memory for memory descriptor\n");
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return ret;
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}
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ret = boot->get_memory_map(&priv->memmap_size, priv->memmap_desc,
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&priv->memmap_key, &desc_size,
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&priv->memmap_version);
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if (ret) {
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printhex2(ret);
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puts(" Can't get memory map\n");
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return ret;
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}
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return 0;
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}
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int efi_call_exit_boot_services(void)
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{
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struct efi_priv *priv = efi_get_priv();
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const struct efi_boot_services *boot = priv->boot;
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efi_uintn_t size;
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u32 version;
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efi_status_t ret;
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size = priv->memmap_alloc;
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ret = boot->get_memory_map(&size, priv->memmap_desc,
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&priv->memmap_key,
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&priv->memmap_desc_size, &version);
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if (ret) {
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printhex2(ret);
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puts(" Can't get memory map\n");
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return ret;
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}
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ret = boot->exit_boot_services(priv->parent_image, priv->memmap_key);
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if (ret)
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return ret;
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return 0;
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}
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