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