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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Intel Corporation <www.intel.com>
*/
#include <common.h>
#include <linux/sizes.h>
#include <asm/e820.h>
#include <asm/arch/slimbootloader.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* This returns a data pointer of memory map info from the guid hob.
*
* @return: A data pointer of memory map info hob
*/
static struct sbl_memory_map_info *get_memory_map_info(void)
{
struct sbl_memory_map_info *data;
const efi_guid_t guid = SBL_MEMORY_MAP_INFO_GUID;
if (!gd->arch.hob_list)
return NULL;
data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
if (!data)
panic("memory map info hob not found\n");
if (!data->count)
panic("invalid number of memory map entries\n");
return data;
}
#define for_each_if(condition) if (!(condition)) {} else
#define for_each_memory_map_entry_reversed(iter, entries) \
for (iter = entries->count - 1; iter >= 0; iter--) \
for_each_if(entries->entry[iter].type == E820_RAM)
/**
* This is to give usable memory region information for u-boot relocation.
* so search usable memory region lower than 4GB.
* The memory map entries from Slim Bootloader hob are already sorted.
*
* @total_size: The memory size that u-boot occupies
* @return : The top available memory address lower than 4GB
*/
ulong board_get_usable_ram_top(ulong total_size)
{
struct sbl_memory_map_info *data;
int i;
u64 addr_start;
u64 addr_end;
ulong ram_top;
data = get_memory_map_info();
/**
* sorted memory map entries from Slim Bootloader based on physical
* start memory address, from low to high. So do reversed search to
* get highest usable, suitable size, 4KB aligned available memory
* under 4GB.
*/
ram_top = 0;
for_each_memory_map_entry_reversed(i, data) {
addr_start = data->entry[i].addr;
addr_end = addr_start + data->entry[i].size;
if (addr_start > SZ_4G)
continue;
if (addr_end > SZ_4G)
addr_end = SZ_4G;
if (addr_end < total_size)
continue;
/* to relocate u-boot at 4K aligned memory */
addr_end = rounddown(addr_end - total_size, SZ_4K);
if (addr_end >= addr_start) {
ram_top = (ulong)addr_end + total_size;
break;
}
}
if (!ram_top)
panic("failed to find available memory for relocation!");
return ram_top;
}
/**
* The memory initialization has already been done in previous Slim Bootloader
* stage thru FSP-M. Instead, this sets the ram_size from the memory map info
* hob.
*/
int dram_init(void)
{
struct sbl_memory_map_info *data;
int i;
u64 ram_size;
data = get_memory_map_info();
/**
* sorted memory map entries from Slim Bootloader based on physical
* start memory address, from low to high. So do reversed search to
* simply get highest usable memory address as RAM size
*/
ram_size = 0;
for_each_memory_map_entry_reversed(i, data) {
/* simply use the highest usable memory address as RAM size */
ram_size = data->entry[i].addr + data->entry[i].size;
break;
}
if (!ram_size)
panic("failed to detect memory size");
gd->ram_size = ram_size;
return 0;
}
int dram_init_banksize(void)
{
if (!CONFIG_NR_DRAM_BANKS)
return 0;
/* simply use a single bank to have whole size for now */
gd->bd->bi_dram[0].start = 0;
gd->bd->bi_dram[0].size = gd->ram_size;
return 0;
}
unsigned int install_e820_map(unsigned int max_entries,
struct e820_entry *entries)
{
struct sbl_memory_map_info *data;
unsigned int i;
data = get_memory_map_info();
for (i = 0; i < data->count; i++) {
entries[i].addr = data->entry[i].addr;
entries[i].size = data->entry[i].size;
entries[i].type = data->entry[i].type;
}
return i;
}
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