93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*
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* memory-init.c
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*
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* Created on: Aug 27, 2011
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* Author: Tiberiu
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*/
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#include <memory-add.h>
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#include <multiboot.h>
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#include <debugio.h>
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#include "../../drivers/cmos/cmos.h"
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#include <stdio.h>
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uint32 mem_kernel_end = 0;
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uint8 mem_initialized = 0;
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uint32 _memory_get_total_mem(MultibootInfo* info)
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{
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// Grub was nice enough to give us info
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if (info->Flags & MultibootInfo_MEMORY) return (1024 + info->MemoryUpper);
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// No? Get info from CMOS
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uint8 low, high;
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uint32 total;
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low = CmosRead(0x30);
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high = CmosRead(0x31);
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total = (uint32)(low | high<<8) + 1024;
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ErrorMem("%#Missing memory info from bootloader. Reading from CMOS: %ukb\n", ColorLightRed, total);
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return total;
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}
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void _memory_reserve_system(MultibootInfo* info)
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{
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MagicBreakpoint();
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if ((info->Flags & MultibootInfo_MEM_MAP) != 0)
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{
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MultibootMemoryMapEntry* location = (MultibootMemoryMapEntry*)info->MemoryMapAddress;
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while ((uint32)location < (info->MemoryMapAddress + info->MemoryMapLength))
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{
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if (location->Type > 1)
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MemPhReserveFrames((uint32)location->Address, (uint32)location->Length);
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location = (MultibootMemoryMapEntry*) ((uint32)location + location->Size + sizeof(uint32));
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}
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}
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else
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{
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ErrorMem("%#Missing %#memory map%# info from bootloader.\n", ColorLightRed, ColorWhite, ColorLightRed);
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// Standard memory hole at 15mb
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MemPhReserveFrames(0x00F00000, 0x00100000);
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}
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// Standard reserved memory areas
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MemPhReserveFrames(0x0, 0x400 + 256); // Real mode IVT, BDA
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MemPhReserveFrames(0x1000, 0x2400); // DMA buffer
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MemPhReserveFrames(0x9FC00, 385*1024); // EBDA, Video memory, ROM area
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}
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void MemoryInitialize (MultibootInfo* info)
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{
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uint32 totalSystemMemory = _memory_get_total_mem(info);
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MemPhInitialize(totalSystemMemory);
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PagingInitialize(0x200000);
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LogMem("Reserving important areas...\n");
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_memory_reserve_system(info);
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LogMem("Allocating kernel heap...\n");
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KernelHeap = MemHeapCreate(KERNEL_HEAP_START, KERNEL_HEAP_START
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+ KERNEL_HEAP_INITIAL_SIZE, 0xCFFFF000, 3); // is kernel, writeable
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LogMem("Done initializing memory!");
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mem_initialized = 2;
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}
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void MemoryTempInitialize (uint32 kernel_end)
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{
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mem_initialized = 1;
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mem_kernel_end = kernel_end;
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LogMem("Initialized temporary memory manager, allocating from %#0x%x.\n", kernel_end);
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}
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