Tiberiu Chibici
e3b3584734
==================================================== Mainly changed: Tasking + Implemented multitasking
95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
/*
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* mem-phys.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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uint32* BlockMap;
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uint32 TotalBlocks;
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uint32 TotalMemory;
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uint32 UsedBlocks;
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inline void ConvertIndexToBlock (uint32 index, uint32* address, uint32* offset)
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{
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*address = (index >> 5);
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*offset = index & 0x1f;
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}
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inline uint32 ConvertBlockToIndex (uint32 address, uint32 offset)
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{
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return (address<<5) | offset;
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}
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void MemPhSetBlock (uint32 Block, uint8 value)
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{
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uint32 addr, off;
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ConvertIndexToBlock(Block, &addr, &off);
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if (value) {
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if ((BlockMap[addr] & (1<<off)) == 0) UsedBlocks++;
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BlockMap[addr] |= 1<<off;
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}
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else {
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if (BlockMap[addr] & (1<<off)) UsedBlocks--;
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BlockMap[addr] &= ~(1<<off);
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}
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}
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uint32 MemPhGetBlock (uint32 Block)
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{
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uint32 addr, off;
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ConvertIndexToBlock(Block, &addr, &off);
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return BlockMap[addr] & (1<<off);
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}
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uint32 MemPhAllocateBlock()
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{
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uint32 addr, pos;
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for (addr = 0; addr < TotalBlocks >> 5; addr++)
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if (BlockMap[addr] != 0xffffffff)
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{
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for (pos = 0; (BlockMap[addr] & (1<<pos)) != 0; pos++) ;
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uint32 index = ConvertBlockToIndex(addr, pos);
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MemPhSetBlock(index, 1);
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// Return address
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return (index<<12);
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}
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return 0xffffffff;
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}
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void MemPhFreeBlock(uint32 addr)
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{
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uint32 Block = addr >> 12;
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if (!Block) return;
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MemPhSetBlock(Block, 0);
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}
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void MemPhInitialize(uint32 SystemMemoryKb)
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{
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TotalBlocks = SystemMemoryKb >> 2;
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TotalMemory = SystemMemoryKb;
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BlockMap = (uint32*) kmalloc(sizeof(uint32) * (1 + (TotalBlocks>>5)));
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memset(BlockMap, 0, sizeof(uint32) * (1 + (TotalBlocks>>5)));
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Log("Mem", "%#Started physical memory manager ok!, found %ukb\n", ColorLightGreen, SystemMemoryKb);
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}
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void MemPhReserveBlocks (uint32 address, uint32 length)
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{
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address >>= 12;
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length = (length>>12) + ((length & 0xfff) > 0);
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uint32 end = address + length;
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for (; address < end ; address++)
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MemPhSetBlock(address, 1);
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}
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