src/mainboard/emulation/qemu-i440fx/memmap.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <cbmem.h>
   4 #include <arch/io.h>
   5 #include <arch/romstage.h>
   6 #include <console/console.h>
   7 #include <cpu/x86/smm.h>
   8 #include "memory.h"
   9 #include "fw_cfg.h"
  10
  11 #define CMOS_ADDR_PORT 0x70
  12 #define CMOS_DATA_PORT 0x71
  13
  14 #define HIGH_RAM_ADDR 0x35
  15 #define LOW_RAM_ADDR 0x34
  16
  17 #define HIGH_HIGHRAM_ADDR 0x5d
  18 #define MID_HIGHRAM_ADDR 0x5c
  19 #define LOW_HIGHRAM_ADDR 0x5b
  20
  21 unsigned long qemu_get_high_memory_size(void)
  22 {
  23         unsigned long high;
  24         outb(HIGH_HIGHRAM_ADDR, CMOS_ADDR_PORT);
  25         high = ((unsigned long)inb(CMOS_DATA_PORT)) << 22;
  26         outb(MID_HIGHRAM_ADDR, CMOS_ADDR_PORT);
  27         high |= ((unsigned long)inb(CMOS_DATA_PORT)) << 14;
  28         outb(LOW_HIGHRAM_ADDR, CMOS_ADDR_PORT);
  29         high |= ((unsigned long)inb(CMOS_DATA_PORT)) << 6;
  30         return high;
  31 }
  32
  33 unsigned long qemu_get_memory_size(void)
  34 {
  35         unsigned long tomk;
  36         outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
  37         tomk = ((unsigned long)inb(CMOS_DATA_PORT)) << 14;
  38         outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
  39         tomk |= ((unsigned long)inb(CMOS_DATA_PORT)) << 6;
  40         tomk += 16 * 1024;
  41         return tomk;
  42 }
  43
  44 uintptr_t cbmem_top_chipset(void)
  45 {
  46         uintptr_t top = 0;
  47
  48         top = fw_cfg_tolud();
  49         if (!top) {
  50                 printk(BIOS_WARNING, "QEMU: Falling back to RAM info in CMOS\n");
  51                 top = (uintptr_t)qemu_get_memory_size() * 1024;
  52         }
  53
  54         if (CONFIG(BOARD_EMULATION_QEMU_X86_Q35)) {
  55                 size_t smm_size;
  56                 smm_region(&top, &smm_size);
  57         }
  58
  59         return top;
  60 }
  61
  62 /* Nothing to do, MTRRs are no-op on QEMU. */
  63 void fill_postcar_frame(struct postcar_frame *pcf)
  64 {
  65 }