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184 lines
3.7 KiB
184 lines
3.7 KiB
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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detsup.c
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Abstract:
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Various detection code is included from the HALs and this module
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includes compatible functions for setup
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Revision History:
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--*/
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#include "setupldr.h"
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#define _NTHAL_
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#define _HALI_
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//
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// Include NCR detection code
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//
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#define SETUP
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#include "halx86\i386\ncrdetct.c"
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//
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// Include AST detection code
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//
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#define ASTMP 1
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#include "halast\i386\astdetct.c"
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//
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// Include Corollary detection code
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//
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#include "halcbus\i386\cbdetect.c"
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//
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// Include MPS 1.1 detection code
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//
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#include "halmps\i386\mpdetect.c"
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//
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// Thunk functions.
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// Equivalent Hal functions which various detection code may use
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//
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PVOID
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HalpMapPhysicalMemory(
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IN PVOID PhysicalAddress,
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IN ULONG NumberPages
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)
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/*++
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Routine Description:
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This routine maps physical memory into the area of virtual memory.
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Arguments:
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PhysicalAddress - Supplies the physical address of the start of the
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area of physical memory to be mapped.
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NumberPages - Supplies the number of pages contained in the area of
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physical memory to be mapped.
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Return Value:
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PVOID - Virtual address at which the requested block of physical memory
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was mapped
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--*/
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{
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extern PHARDWARE_PTE HalPT;
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ULONG PageFrame;
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ULONG i, j, PagesMapped;
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PageFrame = ((ULONG) PhysicalAddress) >> PAGE_SHIFT;
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if (PageFrame >= 1 && PageFrame+NumberPages < 0x1000) {
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//
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// The lower 16M is 'identity' mapped with the physical addresses.
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//
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return PhysicalAddress;
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}
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//
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// Map a pointer to the address requested
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//
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for (i=0; i <= 1024-NumberPages; i++) {
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for (j=0; j < NumberPages; j++) {
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if ( ((PULONG)HalPT)[i+j] ) {
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break;
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}
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}
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if (j == NumberPages) {
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for (j=0; j<NumberPages; j++) {
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HalPT[i+j].PageFrameNumber = PageFrame+j;
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HalPT[i+j].Valid = 1;
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HalPT[i+j].Write = 1;
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}
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j = 0xffc00000 | (i<<12) | (((ULONG) PhysicalAddress) & 0xfff);
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return (PVOID) j;
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}
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}
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SlFatalError((ULONG)PhysicalAddress);
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return NULL;
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}
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PVOID
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HalpMapPhysicalMemoryWriteThrough(
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IN PVOID PhysicalAddress,
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IN ULONG NumberPages
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)
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/*++
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Routine Description:
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This routine maps physical memory into the area of virtual memory.
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Arguments:
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PhysicalAddress - Supplies the physical address of the start of the
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area of physical memory to be mapped.
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NumberPages - Supplies the number of pages contained in the area of
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physical memory to be mapped.
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Return Value:
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PVOID - Virtual address at which the requested block of physical memory
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was mapped
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--*/
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{
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extern PHARDWARE_PTE HalPT;
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ULONG PageFrame;
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ULONG i, j, PagesMapped;
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PageFrame = ((ULONG) PhysicalAddress) >> PAGE_SHIFT;
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//
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// Map a pointer to the address requested
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//
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for (i=0; i <= 1024-NumberPages; i++) {
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for (j=0; j < NumberPages; j++) {
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if ( ((PULONG)HalPT)[i+j] ) {
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break;
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}
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}
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if (j == NumberPages) {
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for (j=0; j<NumberPages; j++) {
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HalPT[i+j].PageFrameNumber = PageFrame+j;
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HalPT[i+j].Valid = 1;
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HalPT[i+j].Write = 1;
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HalPT[i+j].WriteThrough = 1;
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HalPT[i+j].CacheDisable = 1;
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}
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j = 0xffc00000 | (i<<12) | (((ULONG) PhysicalAddress) & 0xfff);
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return (PVOID) j;
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}
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}
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SlFatalError((ULONG)PhysicalAddress);
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return NULL;
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}
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