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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc.
* Copyright (C) 2015-2017 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/io.h>
#include <cbmem.h>
#include <console/console.h>
#include <fsp/util.h>
#include <soc/bootblock.h>
#include <soc/systemagent.h>
static void *top_of_ram_register(void)
{
int num;
int offset;
num = (read32((uintptr_t *)HPET_BASE_ADDRESS) >> 8) & 0x1f;
offset = 0x100 + (0x20 * num) + 0x08;
return (void *)(uintptr_t)(HPET_BASE_ADDRESS + offset);
}
void clear_cbmem_top(void)
{
write32(top_of_ram_register(), 0);
}
void cbmem_top_init(void)
{
struct range_entry fsp_mem;
uintptr_t top;
if (fsp_find_reserved_memory(&fsp_mem))
die("Can't file top of ram.\n");
top = ALIGN_UP(range_entry_base(&fsp_mem), 16 * MiB);
write32(top_of_ram_register(), top);
}
void *cbmem_top(void)
{
/*
* +-------------------------+ Top of RAM (aligned)
* | System Management Mode |
* | code and data | Length: CONFIG_TSEG_SIZE
* | (TSEG) |
* +-------------------------+ SMM base (aligned)
* | |
* | Chipset Reserved Memory |
* | |
* +-------------------------+ top_of_ram (aligned)
* | |
* | CBMEM Root |
* | |
* +-------------------------+
* | |
* | FSP Reserved Memory |
* | |
* +-------------------------+
* | |
* | Various CBMEM Entries |
* | |
* +-------------------------+ top_of_stack (8 byte aligned)
* | |
* | stack (CBMEM Entry) |
* | |
* +-------------------------+
*/
return (void *)(uintptr_t)read32(top_of_ram_register());
}
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