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