2 * Copyright (c) 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <debug_uart.h>
12 #include <linux/err.h>
13 #include <linux/types.h>
15 DECLARE_GLOBAL_DATA_PTR;
18 * This function looks for the highest region of memory lower than 4GB which
19 * has enough space for U-Boot where U-Boot is aligned on a page boundary.
20 * It overrides the default implementation found elsewhere which simply
21 * picks the end of ram, wherever that may be. The location of the stack,
22 * the relocation address, and how far U-Boot is moved by relocation are
23 * set in the global data structure.
25 ulong board_get_usable_ram_top(ulong total_size)
27 struct efi_mem_desc *desc, *end;
28 struct efi_entry_memmap *map;
30 uintptr_t dest_addr = 0;
31 struct efi_mem_desc *largest = NULL;
34 * Find largest area of memory below 4GB. We could
35 * call efi_build_mem_table() for a more accurate picture since it
36 * merges areas together where possible. But that function uses more
37 * pre-relocation memory, and it's not critical that we find the
38 * absolute largest region.
40 ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
42 /* We should have stopped in dram_init(), something is wrong */
43 debug("%s: Missing memory map\n", __func__);
47 end = (struct efi_mem_desc *)((ulong)map + size);
49 for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
50 if (desc->type != EFI_CONVENTIONAL_MEMORY ||
51 desc->physical_start >= 1ULL << 32)
53 if (!largest || desc->num_pages > largest->num_pages)
57 /* If no suitable area was found, return an error. */
59 if (!largest || (largest->num_pages << EFI_PAGE_SHIFT) < (2 << 20))
62 dest_addr = largest->physical_start + (largest->num_pages <<
65 return (ulong)dest_addr;
67 panic("No available memory found for relocation");
73 struct efi_mem_desc *desc, *end;
74 struct efi_entry_memmap *map;
77 ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
79 printf("Cannot find EFI memory map tables, ret=%d\n", ret);
84 end = (struct efi_mem_desc *)((ulong)map + size);
87 for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
88 if (desc->type < EFI_MMAP_IO)
89 gd->ram_size += desc->num_pages << EFI_PAGE_SHIFT;
95 void dram_init_banksize(void)
97 struct efi_mem_desc *desc, *end;
98 struct efi_entry_memmap *map;
102 ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
104 /* We should have stopped in dram_init(), something is wrong */
105 debug("%s: Missing memory map\n", __func__);
108 end = (struct efi_mem_desc *)((ulong)map + size);
111 desc < end && num_banks < CONFIG_NR_DRAM_BANKS;
112 desc = efi_get_next_mem_desc(map, desc)) {
114 * We only use conventional memory below 4GB, and ignore
115 * anything less than 1MB.
117 if (desc->type != EFI_CONVENTIONAL_MEMORY ||
118 desc->physical_start >= 1ULL << 32 ||
119 (desc->num_pages << EFI_PAGE_SHIFT) < 1 << 20)
121 gd->bd->bi_dram[num_banks].start = desc->physical_start;
122 gd->bd->bi_dram[num_banks].size = desc->num_pages <<
128 int print_cpuinfo(void)
130 return default_print_cpuinfo();
133 /* Find any available tables and copy them to a safe place */
134 int reserve_arch(void)
136 struct efi_info_hdr *hdr;
138 debug("table=%lx\n", gd->arch.table);
142 hdr = (struct efi_info_hdr *)gd->arch.table;
144 gd->start_addr_sp -= hdr->total_size;
145 memcpy((void *)gd->start_addr_sp, hdr, hdr->total_size);
146 debug("Stashing EFI table at %lx to %lx, size %x\n",
147 gd->arch.table, gd->start_addr_sp, hdr->total_size);
148 gd->arch.table = gd->start_addr_sp;