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/* SPDX-License-Identifier: GPL-2.0-only */
#define __SIMPLE_DEVICE__
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <device/pci_ops.h>
#include <mainboard/emulation/qemu-i440fx/memory.h>
#include <mainboard/emulation/qemu-i440fx/fw_cfg.h>
#define EXT_TSEG_MBYTES 0x50
#define SMRAMC 0x9d
#define G_SMRAME (1 << 3)
#define D_LCK (1 << 4)
#define D_CLS (1 << 5)
#define D_OPEN (1 << 6)
#define ESMRAMC 0x9e
#define T_EN (1 << 0)
#define TSEG_SZ_MASK (3 << 1)
#define H_SMRAME (1 << 7)
void smm_region(uintptr_t *start, size_t *size)
{
uint8_t esmramc = pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC);
switch ((esmramc & TSEG_SZ_MASK) >> 1) {
case 0:
*size = 1 * MiB;
break;
case 1:
*size = 2 * MiB;
break;
case 2:
*size = 8 * MiB;
break;
default:
*size = pci_read_config16(PCI_DEV(0, 0, 0), EXT_TSEG_MBYTES) * MiB;
}
*start = qemu_get_memory_size() * KiB - *size;
printk(BIOS_SPEW, "SMM_BASE: 0x%08lx, SMM_SIZE: %zu MiB\n", *start, *size / MiB);
}
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