mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-21 17:38:51 +09:00
![Bin Meng](/assets/img/avatar_default.png)
At present Linux kernel loaded from U-Boot as an EFI payload does not boot. This fills in kernel's boot params structure with the required critical EFI information like system table address and memory map stuff so that kernel can obtain essential data like runtime services and ACPI table to boot. With this patch, now U-Boot as an EFI payload becomes much more practical: it is another option of kernel bootloader, ie, can be a replacement for grub. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
290 lines
7.1 KiB
C
290 lines
7.1 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/bootparam.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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void setup_efi_info(struct efi_info *efi_info)
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{
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struct efi_entry_systable *table;
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struct efi_entry_memmap *map;
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char *signature;
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int size, ret;
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memset(efi_info, 0, sizeof(struct efi_info));
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ret = efi_info_get(EFIET_SYS_TABLE, (void **)&table, &size);
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if (ret) {
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printf("Cannot find EFI system table, ret=%d\n", ret);
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return;
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}
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efi_info->efi_systab = (u32)(table->sys_table);
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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;
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}
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efi_info->efi_memdesc_size = map->desc_size;
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efi_info->efi_memdesc_version = map->version;
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efi_info->efi_memmap = (u32)(map->desc);
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efi_info->efi_memmap_size = size - sizeof(struct efi_entry_memmap);
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#ifdef CONFIG_EFI_STUB_64BIT
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efi_info->efi_systab_hi = table->sys_table >> 32;
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efi_info->efi_memmap_hi = (u64)(u32)(map->desc) >> 32;
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signature = EFI64_LOADER_SIGNATURE;
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#else
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signature = EFI32_LOADER_SIGNATURE;
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#endif
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memcpy(&efi_info->efi_loader_signature, signature, 4);
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}
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