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/* SPDX-License-Identifier: GPL-2.0-only */
#define __SIMPLE_DEVICE__
#include <assert.h>
#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>
#include "q35.h"
static uint32_t encode_pciexbar_length(void)
{
switch (CONFIG_MMCONF_BUS_NUMBER) {
case 256: return 0 << 1;
case 128: return 1 << 1;
case 64: return 2 << 1;
default: return dead_code_t(uint32_t);
}
}
uint32_t make_pciexbar(void)
{
return CONFIG_MMCONF_BASE_ADDRESS | encode_pciexbar_length() | 1;
}
/* Check that MCFG is active. If it's not, QEMU was started for machine PC */
void mainboard_machine_check(void)
{
if (pci_read_config32(HOST_BRIDGE, D0F0_PCIEXBAR_LO) != make_pciexbar())
die("You must run qemu for machine Q35 (-M q35)");
}
/* QEMU-specific register */
#define EXT_TSEG_MBYTES 0x50
void smm_region(uintptr_t *start, size_t *size)
{
uint8_t esmramc = pci_read_config8(HOST_BRIDGE, 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(HOST_BRIDGE, 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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