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/* SPDX-License-Identifier: GPL-2.0-only */
#include <cbmem.h>
#include <arch/io.h>
#include <arch/romstage.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include "memory.h"
#include "fw_cfg.h"
#define CMOS_ADDR_PORT 0x70
#define CMOS_DATA_PORT 0x71
#define HIGH_RAM_ADDR 0x35
#define LOW_RAM_ADDR 0x34
#define HIGH_HIGHRAM_ADDR 0x5d
#define MID_HIGHRAM_ADDR 0x5c
#define LOW_HIGHRAM_ADDR 0x5b
unsigned long qemu_get_high_memory_size(void)
{
unsigned long high;
outb(HIGH_HIGHRAM_ADDR, CMOS_ADDR_PORT);
high = ((unsigned long) inb(CMOS_DATA_PORT)) << 22;
outb(MID_HIGHRAM_ADDR, CMOS_ADDR_PORT);
high |= ((unsigned long) inb(CMOS_DATA_PORT)) << 14;
outb(LOW_HIGHRAM_ADDR, CMOS_ADDR_PORT);
high |= ((unsigned long) inb(CMOS_DATA_PORT)) << 6;
return high;
}
unsigned long qemu_get_memory_size(void)
{
unsigned long tomk;
outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
tomk = ((unsigned long) inb(CMOS_DATA_PORT)) << 14;
outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
tomk |= ((unsigned long) inb(CMOS_DATA_PORT)) << 6;
tomk += 16 * 1024;
return tomk;
}
void *cbmem_top_chipset(void)
{
uintptr_t top = 0;
top = fw_cfg_tolud();
if (!top) {
printk(BIOS_WARNING, "QEMU: Falling back to RAM info in CMOS\n");
top = (uintptr_t)qemu_get_memory_size() * 1024;
}
if (CONFIG(BOARD_EMULATION_QEMU_X86_Q35)) {
size_t smm_size;
smm_region(&top, &smm_size);
}
return (void *)top;
}
/* Nothing to do, MTRRs are no-op on QEMU. */
void fill_postcar_frame(struct postcar_frame *pcf)
{
}
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