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https://github.com/brain-hackers/u-boot-brain
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![Bin Meng](/assets/img/avatar_default.png)
This implements payload-specific install_e820_map() to get E820 map from the EFI memory map descriptors. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
253 lines
6.1 KiB
C
253 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <efi.h>
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#include <errno.h>
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#include <usb.h>
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#include <asm/e820.h>
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#include <asm/post.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* This function looks for the highest region of memory lower than 4GB which
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* has enough space for U-Boot where U-Boot is aligned on a page boundary.
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* It overrides the default implementation found elsewhere which simply
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* picks the end of ram, wherever that may be. The location of the stack,
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* the relocation address, and how far U-Boot is moved by relocation are
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* set in the global data structure.
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*/
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ulong board_get_usable_ram_top(ulong total_size)
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{
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struct efi_mem_desc *desc, *end;
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struct efi_entry_memmap *map;
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int ret, size;
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uintptr_t dest_addr = 0;
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struct efi_mem_desc *largest = NULL;
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/*
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* Find largest area of memory below 4GB. We could
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* call efi_build_mem_table() for a more accurate picture since it
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* merges areas together where possible. But that function uses more
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* pre-relocation memory, and it's not critical that we find the
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* absolute largest region.
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*/
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ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
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if (ret) {
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/* We should have stopped in dram_init(), something is wrong */
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debug("%s: Missing memory map\n", __func__);
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goto err;
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}
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end = (struct efi_mem_desc *)((ulong)map + size);
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desc = map->desc;
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for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
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if (desc->type != EFI_CONVENTIONAL_MEMORY ||
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desc->physical_start >= 1ULL << 32)
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continue;
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if (!largest || desc->num_pages > largest->num_pages)
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largest = desc;
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}
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/* If no suitable area was found, return an error. */
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assert(largest);
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if (!largest || (largest->num_pages << EFI_PAGE_SHIFT) < (2 << 20))
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goto err;
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dest_addr = largest->physical_start + (largest->num_pages <<
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EFI_PAGE_SHIFT);
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return (ulong)dest_addr;
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err:
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panic("No available memory found for relocation");
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return 0;
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}
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int dram_init(void)
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{
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struct efi_mem_desc *desc, *end;
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struct efi_entry_memmap *map;
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int size, ret;
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ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
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if (ret) {
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printf("Cannot find EFI memory map tables, ret=%d\n", ret);
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return -ENODEV;
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}
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end = (struct efi_mem_desc *)((ulong)map + size);
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gd->ram_size = 0;
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desc = map->desc;
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for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
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if (desc->type < EFI_MMAP_IO)
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gd->ram_size += desc->num_pages << EFI_PAGE_SHIFT;
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}
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return 0;
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}
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int dram_init_banksize(void)
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{
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struct efi_mem_desc *desc, *end;
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struct efi_entry_memmap *map;
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int ret, size;
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int num_banks;
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ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
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if (ret) {
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/* We should have stopped in dram_init(), something is wrong */
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debug("%s: Missing memory map\n", __func__);
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return -ENXIO;
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}
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end = (struct efi_mem_desc *)((ulong)map + size);
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desc = map->desc;
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for (num_banks = 0;
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desc < end && num_banks < CONFIG_NR_DRAM_BANKS;
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desc = efi_get_next_mem_desc(map, desc)) {
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/*
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* We only use conventional memory and ignore
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* anything less than 1MB.
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*/
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if (desc->type != EFI_CONVENTIONAL_MEMORY ||
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(desc->num_pages << EFI_PAGE_SHIFT) < 1 << 20)
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continue;
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gd->bd->bi_dram[num_banks].start = desc->physical_start;
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gd->bd->bi_dram[num_banks].size = desc->num_pages <<
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EFI_PAGE_SHIFT;
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num_banks++;
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}
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return 0;
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}
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int arch_cpu_init(void)
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{
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post_code(POST_CPU_INIT);
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return x86_cpu_init_f();
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}
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int checkcpu(void)
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{
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return 0;
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}
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int print_cpuinfo(void)
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{
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return default_print_cpuinfo();
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}
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/* Find any available tables and copy them to a safe place */
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int reserve_arch(void)
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{
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struct efi_info_hdr *hdr;
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debug("table=%lx\n", gd->arch.table);
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if (!gd->arch.table)
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return 0;
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hdr = (struct efi_info_hdr *)gd->arch.table;
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gd->start_addr_sp -= hdr->total_size;
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memcpy((void *)gd->start_addr_sp, hdr, hdr->total_size);
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debug("Stashing EFI table at %lx to %lx, size %x\n",
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gd->arch.table, gd->start_addr_sp, hdr->total_size);
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gd->arch.table = gd->start_addr_sp;
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return 0;
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}
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int last_stage_init(void)
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{
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/* start usb so that usb keyboard can be used as input device */
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usb_init();
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return 0;
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}
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unsigned int install_e820_map(unsigned int max_entries,
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struct e820_entry *entries)
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{
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struct efi_mem_desc *desc, *end;
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struct efi_entry_memmap *map;
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int size, ret;
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efi_physical_addr_t last_end_addr = 0;
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struct e820_entry *last_entry = NULL;
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__u32 e820_type;
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unsigned int num_entries = 0;
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ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
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if (ret) {
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printf("Cannot find EFI memory map tables, ret=%d\n", ret);
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return -ENODEV;
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}
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end = (struct efi_mem_desc *)((ulong)map + size);
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for (desc = map->desc; desc < end;
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desc = efi_get_next_mem_desc(map, desc)) {
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if (desc->num_pages == 0)
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continue;
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switch (desc->type) {
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case EFI_LOADER_CODE:
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case EFI_LOADER_DATA:
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case EFI_BOOT_SERVICES_CODE:
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case EFI_BOOT_SERVICES_DATA:
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case EFI_CONVENTIONAL_MEMORY:
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e820_type = E820_RAM;
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break;
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case EFI_RESERVED_MEMORY_TYPE:
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case EFI_RUNTIME_SERVICES_CODE:
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case EFI_RUNTIME_SERVICES_DATA:
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case EFI_MMAP_IO:
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case EFI_MMAP_IO_PORT:
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case EFI_PAL_CODE:
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e820_type = E820_RESERVED;
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break;
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case EFI_ACPI_RECLAIM_MEMORY:
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e820_type = E820_ACPI;
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break;
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case EFI_ACPI_MEMORY_NVS:
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e820_type = E820_NVS;
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break;
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case EFI_UNUSABLE_MEMORY:
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e820_type = E820_UNUSABLE;
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break;
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default:
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printf("Invalid EFI memory descriptor type (0x%x)!\n",
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desc->type);
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continue;
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}
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if (last_entry != NULL && last_entry->type == e820_type &&
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desc->physical_start == last_end_addr) {
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last_entry->size += (desc->num_pages << EFI_PAGE_SHIFT);
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last_end_addr += (desc->num_pages << EFI_PAGE_SHIFT);
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} else {
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if (num_entries >= E820MAX)
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break;
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entries[num_entries].addr = desc->physical_start;
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entries[num_entries].size = desc->num_pages;
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entries[num_entries].size <<= EFI_PAGE_SHIFT;
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entries[num_entries].type = e820_type;
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last_entry = &entries[num_entries];
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last_end_addr = last_entry->addr + last_entry->size;
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num_entries++;
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}
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}
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return num_entries;
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}
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