diff options
Diffstat (limited to 'arch/x86/lib/efi/efi.c')
| -rw-r--r-- | arch/x86/lib/efi/efi.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/arch/x86/lib/efi/efi.c b/arch/x86/lib/efi/efi.c new file mode 100644 index 0000000..ede5d56 --- /dev/null +++ b/arch/x86/lib/efi/efi.c @@ -0,0 +1,151 @@ +/* + * Copyright (c) 2015 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <debug_uart.h> +#include <efi.h> +#include <errno.h> +#include <linux/err.h> +#include <linux/types.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* + * This function looks for the highest region of memory lower than 4GB which + * has enough space for U-Boot where U-Boot is aligned on a page boundary. + * It overrides the default implementation found elsewhere which simply + * picks the end of ram, wherever that may be. The location of the stack, + * the relocation address, and how far U-Boot is moved by relocation are + * set in the global data structure. + */ +ulong board_get_usable_ram_top(ulong total_size) +{ + struct efi_mem_desc *desc, *end; + struct efi_entry_memmap *map; + int ret, size; + uintptr_t dest_addr = 0; + struct efi_mem_desc *largest = NULL; + + /* + * Find largest area of memory below 4GB. We could + * call efi_build_mem_table() for a more accurate picture since it + * merges areas together where possible. But that function uses more + * pre-relocation memory, and it's not critical that we find the + * absolute largest region. + */ + ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size); + if (ret) { + /* We should have stopped in dram_init(), something is wrong */ + debug("%s: Missing memory map\n", __func__); + goto err; + } + + end = (struct efi_mem_desc *)((ulong)map + size); + desc = map->desc; + for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) { + if (desc->type != EFI_CONVENTIONAL_MEMORY || + desc->physical_start >= 1ULL << 32) + continue; + if (!largest || desc->num_pages > largest->num_pages) + largest = desc; + } + + /* If no suitable area was found, return an error. */ + assert(largest); + if (!largest || (largest->num_pages << EFI_PAGE_SHIFT) < (2 << 20)) + goto err; + + dest_addr = largest->physical_start + (largest->num_pages << + EFI_PAGE_SHIFT); + + return (ulong)dest_addr; +err: + panic("No available memory found for relocation"); + return 0; +} + +int dram_init(void) +{ + struct efi_mem_desc *desc, *end; + struct efi_entry_memmap *map; + int size, ret; + + ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size); + if (ret) { + printf("Cannot find EFI memory map tables, ret=%d\n", ret); + + return -ENODEV; + } + + end = (struct efi_mem_desc *)((ulong)map + size); + gd->ram_size = 0; + desc = map->desc; + for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) { + if (desc->type < EFI_MMAP_IO) + gd->ram_size += desc->num_pages << EFI_PAGE_SHIFT; + } + + return 0; +} + +void dram_init_banksize(void) +{ + struct efi_mem_desc *desc, *end; + struct efi_entry_memmap *map; + int ret, size; + int num_banks; + + ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size); + if (ret) { + /* We should have stopped in dram_init(), something is wrong */ + debug("%s: Missing memory map\n", __func__); + return; + } + end = (struct efi_mem_desc *)((ulong)map + size); + desc = map->desc; + for (num_banks = 0; + desc < end && num_banks < CONFIG_NR_DRAM_BANKS; + desc = efi_get_next_mem_desc(map, desc)) { + /* + * We only use conventional memory below 4GB, and ignore + * anything less than 1MB. + */ + if (desc->type != EFI_CONVENTIONAL_MEMORY || + desc->physical_start >= 1ULL << 32 || + (desc->num_pages << EFI_PAGE_SHIFT) < 1 << 20) + continue; + gd->bd->bi_dram[num_banks].start = desc->physical_start; + gd->bd->bi_dram[num_banks].size = desc->num_pages << + EFI_PAGE_SHIFT; + num_banks++; + } +} + +int print_cpuinfo(void) +{ + return default_print_cpuinfo(); +} + +/* Find any available tables and copy them to a safe place */ +int reserve_arch(void) +{ + struct efi_info_hdr *hdr; + + debug("table=%lx\n", gd->arch.table); + if (!gd->arch.table) + return 0; + + hdr = (struct efi_info_hdr *)gd->arch.table; + + gd->start_addr_sp -= hdr->total_size; + memcpy((void *)gd->start_addr_sp, hdr, hdr->total_size); + debug("Stashing EFI table at %lx to %lx, size %x\n", + gd->arch.table, gd->start_addr_sp, hdr->total_size); + gd->arch.table = gd->start_addr_sp; + + return 0; +} |