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/*
* 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;
}
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