/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2018 Intel Corp.
 *
 * 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/romstage.h>
#include <cbmem.h>
#include <fsp/util.h>
#include <intelblocks/ebda.h>
#include <intelblocks/systemagent.h>
#include <stdlib.h>

/*
 * Fill up memory layout information
 *
 * Host Memory Map:
 *
 * +--------------------------+ TOUUD
 * |                          |
 * +--------------------------+ 4GiB
 * |     PCI Address Space    |
 * +--------------------------+ TOLUD (also maps into MC address space)
 * |     iGD                  |
 * +--------------------------+ BDSM
 * |     GTT                  |
 * +--------------------------+ BGSM
 * |     TSEG                 |
 * +--------------------------+ TSEGMB
 * |   DMA Protected Region   |
 * +--------------------------+ DPR
 * |    PRM (C6DRAM/SGX)      |
 * +--------------------------+ PRMRR
 * |     ME Stolen Memory     |
 * +--------------------------+ ME Stolen
 * |     PTT                  |
 * +--------------------------+ top_of_ram
 * |     Reserved - FSP/CBMEM |
 * +--------------------------+ TOLUM
 * |     Usage DRAM           |
 * +--------------------------+ 0
 *
 * Some of the base registers above can be equal making the size of those
 * regions 0. The reason is because the memory controller internally subtracts
 * the base registers from each other to determine sizes of the regions. In
 * other words, the memory map is in a fixed order no matter what.
 */
void fill_soc_memmap_ebda(struct ebda_config *cfg)
{
	struct range_entry tolum;

	fsp_find_bootloader_tolum(&tolum);
	cfg->cbmem_top = range_entry_end(&tolum);
}

void cbmem_top_init(void)
{
	/* Fill up EBDA area */
	fill_ebda_area();
}

/*
 *     +-------------------------+  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)   |
 *     |                         |
 *     +-------------------------+
 */
void *cbmem_top_chipset(void)
{
	struct ebda_config ebda_cfg;

	retrieve_ebda_object(&ebda_cfg);

	return (void *)(uintptr_t)ebda_cfg.cbmem_top;
}