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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
158 lines
4.0 KiB
C
158 lines
4.0 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 <debug_uart.h>
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#include <efi.h>
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#include <errno.h>
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#include <linux/err.h>
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#include <linux/types.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 below 4GB, 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->physical_start >= 1ULL << 32 ||
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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 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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