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872 lines
22 KiB
872 lines
22 KiB
/*++
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Copyright (c) 1990, 1991 Microsoft Corporation
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Module Name:
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hwheap.c
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Abstract:
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This module goes through ROM area and tries to pick up all the ROM
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blocks.
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Author:
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Shie-Lin Tzong (shielint) 21-Jan-92
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Environment:
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Real mode.
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Revision History:
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--*/
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#include "hwdetect.h"
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#include "hwvbios.h"
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FPTEMPORARY_ROM_BLOCK BlockHead;
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FPTEMPORARY_ROM_BLOCK BlockPointer;
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BOOLEAN
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AddRomBlock (
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ULONG RomAddress,
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ULONG RomSize
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)
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/*++
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Routine Description:
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This routine adds a ROM/RAM block to our ROM list.
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Arguments:
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RomAddress - the starting address of the ROM/RAM block to be added.
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RomSize - the size of the ROM/RAM block (in byte).
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Return Value:
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A value of TRUE is returned if success. Otherwise, a value of
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FALSE is returned.
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--*/
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{
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LONG AddSize;
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ULONG AddAddress;
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FPTEMPORARY_ROM_BLOCK pCurrentBlock, pNextBlock;
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ULONG CurrentBlock, NextBlock, AddBlock;
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ULONG EndAddBlock, EndCurrentBlock, EndNextBlock;
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BOOLEAN fOverlap=FALSE;
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pCurrentBlock = NULL;
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pNextBlock = NULL;
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AddSize = RomSize;
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AddAddress = RomAddress;
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AddBlock = RomAddress;
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//
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// If there are other blocks, make sure there is no overlap with them
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//
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if (BlockHead) {
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pCurrentBlock = BlockHead;
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pNextBlock = pCurrentBlock->Next;
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CurrentBlock = pCurrentBlock->RomBlock.Address;
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EndCurrentBlock = CurrentBlock + pCurrentBlock->RomBlock.Size;
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EndAddBlock = RomAddress + RomSize;
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while (pCurrentBlock!=NULL) {
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//
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// calculate location of next block (if it's there)
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//
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if(pNextBlock) {
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NextBlock = pNextBlock->RomBlock.Address;
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EndNextBlock = NextBlock + pNextBlock->RomBlock.Size;
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}
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//
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// if overlapping with current block, then stop and
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// resolve overlap
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//
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if((RomAddress < EndCurrentBlock)&& (RomAddress >= CurrentBlock)){
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fOverlap = TRUE;
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break;
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}
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//
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// if add block is lower than the current one,
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// or there is not a next block, then no need to search further
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//
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if((EndAddBlock <= CurrentBlock) || (pNextBlock == NULL)) {
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break;
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}
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//
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// if block is lower than next one, but greater than current
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// one, we have found the right area
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//
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if ((EndAddBlock <= NextBlock) && (AddBlock >= EndCurrentBlock)) {
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break;
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}
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//
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// if conflicting with next block, stop searching and
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// resolve conflict after this loop
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//
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if((EndAddBlock > NextBlock) && (EndAddBlock <= EndNextBlock)) {
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fOverlap = TRUE;
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break;
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}
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pCurrentBlock = pNextBlock;
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pNextBlock = pCurrentBlock->Next;
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CurrentBlock = NextBlock;
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EndCurrentBlock = EndNextBlock;
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}
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}
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//
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// if we have reached this point, there may be a conflict
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// with the current block.
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//
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if(fOverlap) {
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if(AddBlock < EndCurrentBlock) {
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AddAddress = EndCurrentBlock;
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AddSize = EndAddBlock - EndCurrentBlock;
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if(AddSize <= 0) {
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return TRUE;
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}
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}
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if((pNextBlock != NULL) && (EndAddBlock > NextBlock)) {
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AddSize = NextBlock - AddBlock;
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if(AddSize <= 0) {
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return TRUE;
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}
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}
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}
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BlockPointer->RomBlock.Address = AddAddress;
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BlockPointer->RomBlock.Size = AddSize;
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//
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// Put it on the list.
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// if it belongs on top, put it there
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//
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if ((pCurrentBlock == NULL)||
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((pCurrentBlock == BlockHead) && (CurrentBlock > AddBlock))) {
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BlockPointer->Next = pCurrentBlock;
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BlockHead = BlockPointer;
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} else {
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//
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// else add to middle or bottom depending on NextBlock
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//
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BlockPointer->Next = pNextBlock;
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pCurrentBlock->Next = BlockPointer;
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}
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BlockPointer++; // Note that this works because
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// we know the offset part of
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// the addr is always < 64k.
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return TRUE;
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}
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BOOLEAN
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ScanRomBlocks(
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VOID
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)
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/*++
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Routine Description:
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This routine scans the ROM IO area and checks for 55AA at every
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512 bytes for valid ROM blocks.
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NOTES:
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-------------
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------------------100000
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^ | |
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| -------------f0000 (ROMBIOS_START) ---
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| | | ^
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EXTROM_LEN -------------e0000 (PS2BIOS_START) --- |
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| | | ^ Search |
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| | | Search | Range |
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| -------------d0000 Range | on AT |
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| | | on PS/2| |
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V | | V V
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------------------c0000 (EXTROM_START) --- ---
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ON AT:
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Scan through EXTROM_START-effff for ROM Blocks
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ON PS2
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Scan through EXTROM_START-dffff for ROM Blocks
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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ULONG BlockSize;
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BOOLEAN Success = TRUE;
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FPUCHAR Current;
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ULONG RomAddr, RomEnd;
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//
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// As per the machine type restrict the search range
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//
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MAKE_FP(Current, EXTROM_START);
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RomAddr = EXTROM_START;
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if ((HwBusType == MACHINE_TYPE_MCA) ||
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(BiosSystemEnvironment.Model == PS2_L40) ||
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(BiosSystemEnvironment.Model == PS1_386) ||
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(BiosSystemEnvironment.Model == PS2_AT)) {
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RomEnd = PS2BIOS_START;
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} else {
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RomEnd = ROMBIOS_START;
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}
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while (RomAddr < RomEnd) {
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if (((FPROM_HEADER)Current)->Signature == ROM_HEADER_SIGNATURE) {
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BlockSize = (ULONG)((FPROM_HEADER)Current)->NumberBlocks * BLOCKSIZE;
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if ((RomAddr + BlockSize) > RomEnd) {
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BlockSize = RomEnd - RomAddr;
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}
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//
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// V7 VRAM card does not correctly report its BlockSize. Since
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// this is a very popular video card, we provide a workaround
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// for it.
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//
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if ((RomAddr == 0xC0000) && (BlockSize < 0x8000)) {
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BlockSize = 0x8000;
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}
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if (BlockSize != 0) {
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if (!AddRomBlock(RomAddr, BlockSize)) {
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Success = FALSE;
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break;
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}
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RomAddr += BlockSize;
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RomAddr = ALIGN_UP(RomAddr, ROM_HEADER_INCREMENT);
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MAKE_FP(Current, RomAddr);
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continue;
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}
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}
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RomAddr += ROM_HEADER_INCREMENT;
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MAKE_FP(Current, RomAddr);
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}
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//
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// Last but not least, add the system ROM to the list
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//
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if (Success) {
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RomAddr = ROMBIOS_START;
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BlockSize = ROMBIOS_LEN;
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if ((HwBusType == MACHINE_TYPE_MCA) ||
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(BiosSystemEnvironment.Model == PS2_L40) ||
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(BiosSystemEnvironment.Model == PS1_386) ||
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(BiosSystemEnvironment.Model == PS2_AT)) {
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RomAddr = PS2BIOS_START;
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BlockSize = PS2BIOS_LEN;
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}
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if (!AddRomBlock(RomAddr, BlockSize)) {
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Success = FALSE;
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}
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}
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return Success;
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}
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FPTEMPORARY_ROM_BLOCK
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MatchRomBlock (
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ULONG PhysicalAddr
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)
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/*++
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Routine Description:
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This routine finds the ROM block which the 'PhysicalAddr' is in.
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Arguments:
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PhysicalAddr - the physical address ...
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Return Value:
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A pointer to the detected ROM block.
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--*/
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{
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FPTEMPORARY_ROM_BLOCK CurrentBlock;
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ROM_BLOCK RomBlock;
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CurrentBlock = BlockHead;
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while (CurrentBlock) {
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RomBlock = CurrentBlock->RomBlock;
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if (RomBlock.Address <= PhysicalAddr &&
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RomBlock.Address + RomBlock.Size > PhysicalAddr) {
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break;
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} else {
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CurrentBlock = CurrentBlock->Next;
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}
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}
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return(CurrentBlock);
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}
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BOOLEAN
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IsSameRomBlock (
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FPTEMPORARY_ROM_BLOCK Source,
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FPTEMPORARY_ROM_BLOCK Destination
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)
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/*++
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Routine Description:
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This routine checks if the passed in ROM blocks contain the same
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information. This ususally happens when the two ROM blocks are for
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video ROM and shadowed video ROM.
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Arguments:
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Source - the source ROM block.
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Destination - the ROM block to compare with.
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Return Value:
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BOOLEAN TRUE if the two ROM blocks are the same else FALSE is returned.
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--*/
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{
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if (Source == NULL || Destination == NULL) {
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return(FALSE);
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}
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//
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// First make sure their sizes are the same.
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//
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if (Source->RomBlock.Size == Destination->RomBlock.Size) {
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if (!HwRomCompare(Source->RomBlock.Address,
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Destination->RomBlock.Address,
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Source->RomBlock.Size)){
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return(TRUE);
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}
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}
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return(FALSE);
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}
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VOID
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CheckVideoRom (
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VOID
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)
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/*++
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Routine Description:
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This routine checks if the int 10h video handler is in the video
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ROM block detected by us. If not, the video ROM must have been
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remapped/shadowed to other area (usually 0xE0000.)
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NOTE: In this function, I commented out the code which removes the
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Video ROM block if it has been shadowed. I found out
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machine POST code does not modify ALL the VIDEO ROM related
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pointers.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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ULONG Vector, Handler, VectorAddr = 0x10 * sizeof(ULONG);
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FPULONG pVectorAddr;
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FPTEMPORARY_ROM_BLOCK RomBlock, VideoRomBlock;
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ULONG Size;
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MAKE_FP(pVectorAddr, VectorAddr);
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Vector = *pVectorAddr;
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Handler = ((Vector >> 16) << 4) + (Vector & 0xffff);
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RomBlock = MatchRomBlock(Handler);
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//
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// Check if the int 10h handler falls in one of our ROM blocks.
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//
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if (RomBlock) {
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if (RomBlock->RomBlock.Address >= 0xC0000 &&
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RomBlock->RomBlock.Address < 0xC8000) {
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//
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// if int 10h handler is in the standard video ROM area, we simply
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// return. Either the video ROM is not shadowed or it
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// is a in-place shadow.
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//
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return;
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} else {
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//
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// The ROM block associated with the int 10h handler is not in
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// standard video bios ROM area. It must have been mapped to
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// the current location. We now need to make sure we have the
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// ROM block which contains the 40:a8 VGA parameter.
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//
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VectorAddr = VGA_PARAMETER_POINTER;
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MAKE_FP(pVectorAddr, VectorAddr);
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Vector = *pVectorAddr;
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Handler = ((Vector >> 16) << 4) + (Vector & 0xffff);
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VideoRomBlock = MatchRomBlock(Handler);
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if (VideoRomBlock == NULL) {
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//
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// We did not find the Video ROM associated with the
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// VGA parameters. Try detect it.
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//
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//
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// In the following memory comparison, we skip the first 16 bytes.
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// Because most likely the reason we did not find the standard
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// Video ROM is because the signature word is missing.
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//
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Handler = (Handler & 0xF0000) +
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(RomBlock->RomBlock.Address & 0xFFFF);
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if (!HwRomCompare(RomBlock->RomBlock.Address + 0x10,
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Handler + 0x10,
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RomBlock->RomBlock.Size - 0x10)) {
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//
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// Note: The old code looked like this for many years:
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//
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/*
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if ((Handler & 0xFFFF == 0) && (RomBlock->RomBlock.Size < 0x8000)){
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Size = 0x8000;
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} else {
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Size = RomBlock->RomBlock.Size;
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}
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*/
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//
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// But (Handler & 0xFFFF == 0) is always false. So
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// Size always equals RomBlock->RomBlock.Size. Rather than
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// fix the comparison, which might cause machines to break,
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// I'm going to assume that it's fine to just make the code
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// do what it's always done. - JakeO 8/9/00
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//
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Size = RomBlock->RomBlock.Size;
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AddRomBlock(Handler, Size);
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}
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}
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}
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} else {
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//
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// There is no ROM block associated with the int 10h handler.
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// We can find the shadowed video ROM block if:
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// We detected the original video ROM in 0xC0000 - 0xC8000 range
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//
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VideoRomBlock = MatchRomBlock((Handler & 0xFFFF) + 0xC0000);
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if (VideoRomBlock != NULL) {
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//
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// In the following memory comparison, we skip the first 16 bytes.
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// Because most likely the reason we did not find the shadow rom
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// is the signature word is missing.
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//
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if (!HwRomCompare(VideoRomBlock->RomBlock.Address + 0x10,
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(Handler & 0xF0000) +
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(VideoRomBlock->RomBlock.Address & 0xFFFF) + 0x10,
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VideoRomBlock->RomBlock.Size - 0x10)) {
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AddRomBlock((VideoRomBlock->RomBlock.Address & 0xFFFF) +
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(Handler & 0xF0000),
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VideoRomBlock->RomBlock.Size);
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}
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}
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}
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}
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VOID
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GetRomBlocks(
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FPUCHAR ReservedBuffer,
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PUSHORT Size
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)
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/*++
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Routine Description:
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This routine scans the ROM IO area and collects all the ROM blocks.
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Arguments:
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ReservedBuffer - Supplies a far pointer to the buffer.
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Size - Supplies a near pointer to a variable to receive the size
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of the ROM block.
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Return Value:
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None.
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--*/
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{
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FPTEMPORARY_ROM_BLOCK Source;
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ULONG StartAddr, EndAddr;
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FPUSHORT TestAddr;
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FPROM_BLOCK Destination;
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USHORT BufferSize;
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ULONG EBiosAddress = 0, EBiosLength = 0;
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ULONG far *EBiosInformation = (ULONG far *)
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((DOS_BEGIN_SEGMENT << 4) + EBIOS_INFO_OFFSET);
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//
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// First we reserve the max space needed and build our temporary rom
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// block list in the heap space below the space reservedand. After
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// the temporary list is built, we then copy it to the caller supplied
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// reserved space.
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//
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BlockPointer = (FPTEMPORARY_ROM_BLOCK)HwAllocateHeap(0, FALSE);
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BlockHead = NULL;
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*Size = 0;
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GetBiosSystemEnvironment((PUCHAR)&BiosSystemEnvironment);
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if (BiosSystemEnvironment.ConfigurationFlags & 0x4) {
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//
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// If extened BIOS data area is allocated, we will find out its
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// location and size and save in ROM blocks.
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//
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_asm {
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push es
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mov ah, 0xC1
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int 15h
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jc short Exit
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cmp ah, 0x86
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je short Exit
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mov bx, 0
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mov dx, 0
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mov ax, 0
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mov al, es:[bx]
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shl ax, 10
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mov word ptr EBiosLength, ax
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mov ax, es
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mov dx, es
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shl ax, 4
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shr dx, 12
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mov word ptr EBiosAddress, ax
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mov word ptr EBiosAddress + 2, dx
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Exit:
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pop es
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}
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}
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//
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// Save the Extended BIOS data area address and size at 700:40
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//
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if (EBiosLength) {
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*EBiosInformation++ = EBiosAddress;
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*EBiosInformation = EBiosLength;
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} else {
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*EBiosInformation++ = 0L;
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*EBiosInformation = 0L;
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}
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if (!ScanRomBlocks()) {
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|
return;
|
|
}
|
|
|
|
//
|
|
// On some machines, when they shadow video ROM from 0xC0000 to
|
|
// 0xE0000, they copy code only (no signature.) So, we need
|
|
// special code to work around the problem.
|
|
//
|
|
|
|
CheckVideoRom();
|
|
|
|
//
|
|
// Now do our special hack for IBM. On SOME IBM PCs, they use
|
|
// E0000-FFFFF for system BIOS (even on non PS/2 machines.) Since
|
|
// system BIOS has no ROM header, it is very hard to know the starting
|
|
// address of system ROM. So we:
|
|
//
|
|
// 1. Make sure there is no ROM block in E0000-EFFFF area.
|
|
// 2. and E0000-EFFFF contains valid data.
|
|
//
|
|
// If both 1 and 2 are true, we assume E0000-EFFFF is part of system
|
|
// ROM.
|
|
//
|
|
|
|
Source = BlockHead;
|
|
while (Source) {
|
|
StartAddr = Source->RomBlock.Address;
|
|
EndAddr = StartAddr + Source->RomBlock.Size - 1;
|
|
if ((StartAddr < 0xE0000 && EndAddr < 0xE0000) ||
|
|
(StartAddr >= 0xF0000)) {
|
|
Source = Source->Next;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if (Source == NULL) {
|
|
for (StartAddr = 0xE0000; StartAddr < 0xF0000; StartAddr += 0x800) {
|
|
MAKE_FP(TestAddr, StartAddr);
|
|
if (*TestAddr != 0xffff) {
|
|
AddRomBlock(0xE0000, 0x10000);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Now copy the rom block list to our reserved space and release
|
|
// the extra space we reserved.
|
|
//
|
|
|
|
Source = BlockHead;
|
|
Destination = (FPROM_BLOCK)ReservedBuffer;
|
|
BufferSize = 0;
|
|
while (Source) {
|
|
*Destination = *((FPROM_BLOCK)&Source->RomBlock);
|
|
BufferSize += sizeof(ROM_BLOCK);
|
|
Source = Source->Next;
|
|
Destination++;
|
|
}
|
|
*Size = BufferSize;
|
|
}
|
|
|
|
VOID
|
|
HwGetBiosDate(
|
|
ULONG StartingAddress,
|
|
USHORT Length,
|
|
PUSHORT Year,
|
|
PUSHORT Month,
|
|
PUSHORT Day
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Scans the specified area for the most recent date of the
|
|
form xx/xx/xx.
|
|
|
|
Arguments:
|
|
|
|
StartingAddress - First address to scan
|
|
Length - Length of area to scan
|
|
|
|
Return Value:
|
|
|
|
Year - If non-zero, the year of the date (1991, 1992, ...)
|
|
Month - If non-zero, then month of the date found
|
|
Day - If non-zero, the day of the date found
|
|
|
|
|
|
--*/
|
|
{
|
|
FPUCHAR fp, date;
|
|
USHORT y, m, d;
|
|
UCHAR c;
|
|
ULONG i, temp;
|
|
|
|
//
|
|
// Zero return values
|
|
//
|
|
|
|
*Year = 0;
|
|
*Month = 0;
|
|
*Day = 0;
|
|
|
|
//
|
|
// Search for date with the format MM/DD/YY or M1M1M2M2//D1D1D2D2//Y1Y1Y2Y2
|
|
//
|
|
|
|
MAKE_FP(fp, StartingAddress); // initialize fp pointer
|
|
while (Length > 8) {
|
|
|
|
c = fp[7];
|
|
if ((c < '0' || c > '9') && (c != '/' && c != '-')) {
|
|
// these 8 bytes are not a date, next location
|
|
|
|
fp += 8;
|
|
Length -= 8;
|
|
continue;
|
|
}
|
|
|
|
date = fp; // check for date at this pointer
|
|
fp += 1; // skip to next byte
|
|
Length -= 1;
|
|
|
|
//
|
|
// Check for date of the form MM/DD/YY
|
|
//
|
|
|
|
y = 0;
|
|
if (date[0] >= '0' && date[0] <= '9' &&
|
|
date[1] >= '0' && date[1] <= '9' &&
|
|
(date[2] == '/' || date[2] == '-') &&
|
|
date[3] >= '0' && date[3] <= '9' &&
|
|
date[4] >= '0' && date[4] <= '9' &&
|
|
(date[5] == '/' || date[5] == '-') &&
|
|
date[6] >= '0' && date[6] <= '9' &&
|
|
date[7] >= '0' && date[7] <= '9' ) {
|
|
|
|
|
|
//
|
|
// A valid looking date field at date, crack it
|
|
//
|
|
|
|
y = (date[6] - '0') * 10 + date[7] - '0' + 1900;
|
|
m = (date[0] - '0') * 10 + date[1] - '0';
|
|
d = (date[3] - '0') * 10 + date[4] - '0';
|
|
}
|
|
|
|
//
|
|
// Check for date of the form M1M1M2M2//D1D1D2D2//Y1Y1Y2Y2
|
|
//
|
|
|
|
if (Length >= 15 &&
|
|
date[ 0] >= '0' && date[ 0] <= '9' && date[ 0] == date[ 1] &&
|
|
date[ 2] >= '0' && date[ 2] <= '9' && date[ 2] == date[ 3] &&
|
|
(date[ 4] == '/' || date[ 4] == '-') && date[ 4] == date[ 5] &&
|
|
date[ 6] >= '0' && date[ 6] <= '9' && date[ 6] == date[ 7] &&
|
|
date[ 8] >= '0' && date[ 8] <= '9' && date[ 8] == date[ 9] &&
|
|
(date[10] == '/' || date[10] == '-') && date[10] == date[11] &&
|
|
date[12] >= '0' && date[12] <= '9' && date[12] == date[13] &&
|
|
date[14] >= '0' && date[14] <= '9' && date[14] == date[15]) {
|
|
|
|
//
|
|
// A valid looking date field at date, crack it
|
|
//
|
|
|
|
y = (date[12] - '0') * 10 + date[14] - '0' + 1900;
|
|
m = (date[ 0] - '0') * 10 + date[ 2] - '0';
|
|
d = (date[ 6] - '0') * 10 + date[ 8] - '0';
|
|
}
|
|
|
|
if (y != 0) {
|
|
if (m < 1 || m > 12 || d < 1 || d > 31) {
|
|
y = 0; // bad field in date, skip it
|
|
} else {
|
|
if (y < 1980) {
|
|
|
|
//
|
|
// Roll to next century.
|
|
//
|
|
|
|
y += 100;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Check for date of the form 19xx or 20xx
|
|
//
|
|
// First, check the 5th character is not a digit.
|
|
//
|
|
|
|
#define IS_DIGIT(x) (((x) >= '0') && ((x) <= '9'))
|
|
|
|
if (!IS_DIGIT(date[4])) {
|
|
for (i = 0, temp = 0; i < 4; i++) {
|
|
if (!IS_DIGIT(date[i])) {
|
|
temp = 0;
|
|
break;
|
|
}
|
|
temp = (temp * 10) + date[i] - '0';
|
|
}
|
|
if ((temp >= 1980) && (temp < 2599)) {
|
|
|
|
//
|
|
// Looks like a reasonable date, use it.
|
|
//
|
|
|
|
y = (USHORT)temp;
|
|
m = 0;
|
|
d = 0;
|
|
}
|
|
}
|
|
|
|
if (!y) {
|
|
// not a date - skip it
|
|
continue;
|
|
}
|
|
|
|
if ((y > *Year) ||
|
|
(y == *Year && m > *Month) ||
|
|
(y == *Year && m == *Month && d > *Day) ) {
|
|
|
|
//
|
|
// This date is more recent
|
|
//
|
|
|
|
*Year = y;
|
|
*Month = m;
|
|
*Day = d;
|
|
}
|
|
}
|
|
}
|
|
|
|
|