2N/A/*
2N/A * GRUB -- GRand Unified Bootloader
2N/A * Copyright (C) 2009 Free Software Foundation, Inc.
2N/A *
2N/A * GRUB is free software: you can redistribute it and/or modify
2N/A * it under the terms of the GNU General Public License as published by
2N/A * the Free Software Foundation, either version 3 of the License, or
2N/A * (at your option) any later version.
2N/A *
2N/A * GRUB is distributed in the hope that it will be useful,
2N/A * but WITHOUT ANY WARRANTY; without even the implied warranty of
2N/A * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2N/A * GNU General Public License for more details.
2N/A *
2N/A * You should have received a copy of the GNU General Public License
2N/A * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
2N/A */
2N/A
2N/A#include <grub/i386/memory.h>
2N/A#include <grub/machine/memory.h>
2N/A#include <grub/machine/boot.h>
2N/A#include <grub/types.h>
2N/A#include <grub/err.h>
2N/A#include <grub/misc.h>
2N/A#include <grub/cmos.h>
2N/A#include <grub/offsets.h>
2N/A
2N/A#define QEMU_CMOS_MEMSIZE_HIGH 0x35
2N/A#define QEMU_CMOS_MEMSIZE_LOW 0x34
2N/A
2N/A#define QEMU_CMOS_MEMSIZE2_HIGH 0x31
2N/A#define QEMU_CMOS_MEMSIZE2_LOW 0x30
2N/A
2N/A#define min(a,b) ((a) > (b) ? (b) : (a))
2N/A
2N/Aextern char _start[];
2N/Aextern char _end[];
2N/A
2N/Astatic grub_uint64_t mem_size, above_4g;
2N/A
2N/Avoid
2N/Agrub_machine_mmap_init ()
2N/A{
2N/A grub_uint8_t high, low, b, c, d;
2N/A grub_cmos_read (QEMU_CMOS_MEMSIZE_HIGH, &high);
2N/A grub_cmos_read (QEMU_CMOS_MEMSIZE_LOW, &low);
2N/A mem_size = ((grub_uint64_t) high) << 24
2N/A | ((grub_uint64_t) low) << 16;
2N/A if (mem_size > 0)
2N/A {
2N/A /* Don't ask... */
2N/A mem_size += (16 * 1024 * 1024);
2N/A }
2N/A else
2N/A {
2N/A grub_cmos_read (QEMU_CMOS_MEMSIZE2_HIGH, &high);
2N/A grub_cmos_read (QEMU_CMOS_MEMSIZE2_LOW, &low);
2N/A mem_size
2N/A = ((((grub_uint64_t) high) << 18) | (((grub_uint64_t) low) << 10))
2N/A + 1024 * 1024;
2N/A }
2N/A
2N/A grub_cmos_read (0x5b, &b);
2N/A grub_cmos_read (0x5c, &c);
2N/A grub_cmos_read (0x5d, &d);
2N/A above_4g = (((grub_uint64_t) b) << 16)
2N/A | (((grub_uint64_t) c) << 24)
2N/A | (((grub_uint64_t) d) << 32);
2N/A}
2N/A
2N/Agrub_err_t
2N/Agrub_machine_mmap_iterate (grub_memory_hook_t hook)
2N/A{
2N/A if (hook (0x0,
2N/A (grub_addr_t) _start,
2N/A GRUB_MEMORY_AVAILABLE))
2N/A return 1;
2N/A
2N/A if (hook ((grub_addr_t) _end,
2N/A 0xa0000 - (grub_addr_t) _end,
2N/A GRUB_MEMORY_AVAILABLE))
2N/A return 1;
2N/A
2N/A if (hook (GRUB_MEMORY_MACHINE_UPPER,
2N/A 0x100000 - GRUB_MEMORY_MACHINE_UPPER,
2N/A GRUB_MEMORY_RESERVED))
2N/A return 1;
2N/A
2N/A /* Everything else is free. */
2N/A if (hook (0x100000,
2N/A min (mem_size, (grub_uint32_t) -GRUB_BOOT_MACHINE_SIZE) - 0x100000,
2N/A GRUB_MEMORY_AVAILABLE))
2N/A return 1;
2N/A
2N/A /* Protect boot.img, which contains the gdt. It is mapped at the top of memory
2N/A (it is also mapped below 0x100000, but we already reserved that area). */
2N/A if (hook ((grub_uint32_t) -GRUB_BOOT_MACHINE_SIZE,
2N/A GRUB_BOOT_MACHINE_SIZE,
2N/A GRUB_MEMORY_RESERVED))
2N/A return 1;
2N/A
2N/A if (above_4g != 0 && hook (0x100000000ULL, above_4g,
2N/A GRUB_MEMORY_AVAILABLE))
2N/A return 1;
2N/A
2N/A return 0;
2N/A}