65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
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/*
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Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
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This file is part of Aedrix.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <arch/multiboot.h>
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#include <mmu.h>
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struct multiboot_mmap {
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unsigned int size;
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unsigned int base_addr_low, base_addr_high;
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unsigned int length_low, length_high;
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unsigned int type;
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};
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extern multiboot_info_t* multiboot_mbd;
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extern uint32 multiboot_magic;
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int detect_memory_mmap() {
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struct multiboot_mmap* mmap = (struct multiboot_mmap*)multiboot_mbd->mmap_addr;
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int found_region = 0;
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while ((char*)mmap < (char*)multiboot_mbd->mmap_addr + multiboot_mbd->mmap_length) {
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if (mmap->base_addr_high || mmap->length_high)
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return -1;
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if (mmap->type == 0x1) { /* ignore non-usable memory */
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declare_memory_region((void*)mmap->base_addr_low,
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(void*)(mmap->base_addr_low + mmap->length_low));
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found_region = 1;
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}
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mmap = (struct multiboot_mmap*) ((unsigned int)mmap + mmap->size + sizeof(unsigned int));
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}
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return !found_region;
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}
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int detect_memory_contiguous() {
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declare_memory_region((void*)0x0, (void*)((uint32)multiboot_mbd->mem_lower * 1024));
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declare_memory_region((void*)0x1000000, (void*)((uint32)multiboot_mbd->mem_upper*1024 + 0x100000));
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return 0;
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}
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int detect_memory() {
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if (multiboot_mbd->flags & (1<<6))
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return detect_memory_mmap();
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else if (multiboot_mbd->flags & (1<<0))
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return detect_memory_contiguous();
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return -1;
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}
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