+++ /dev/null
-/*
- * FreeLoader
- * Copyright (C) 1998-2003 Brian Palmer <brianp@sginet.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <freeldr.h>
-#include <arch.h>
-#include <mm.h>
-#include <debug.h>
-#include <rtl.h>
-#include <portio.h>
-
-
-U32 GetExtendedMemorySize(VOID)
-{
- REGS RegsIn;
- REGS RegsOut;
- U32 MemorySize;
-
- DbgPrint((DPRINT_MEMORY, "GetExtendedMemorySize()\n"));
-
- // Int 15h AX=E801h
- // Phoenix BIOS v4.0 - GET MEMORY SIZE FOR >64M CONFIGURATIONS
- //
- // AX = E801h
- // Return:
- // CF clear if successful
- // AX = extended memory between 1M and 16M, in K (max 3C00h = 15MB)
- // BX = extended memory above 16M, in 64K blocks
- // CX = configured memory 1M to 16M, in K
- // DX = configured memory above 16M, in 64K blocks
- // CF set on error
- RegsIn.w.ax = 0xE801;
- Int386(0x15, &RegsIn, &RegsOut);
-
- DbgPrint((DPRINT_MEMORY, "Int15h AX=E801h\n"));
- DbgPrint((DPRINT_MEMORY, "AX = 0x%x\n", RegsOut.w.ax));
- DbgPrint((DPRINT_MEMORY, "BX = 0x%x\n", RegsOut.w.bx));
- DbgPrint((DPRINT_MEMORY, "CX = 0x%x\n", RegsOut.w.cx));
- DbgPrint((DPRINT_MEMORY, "DX = 0x%x\n", RegsOut.w.dx));
- DbgPrint((DPRINT_MEMORY, "CF set = %s\n\n", (RegsOut.x.eflags & I386FLAG_CF) ? "TRUE" : "FALSE"));
-
- if (INT386_SUCCESS(RegsOut))
- {
- // If AX=BX=0000h the use CX and DX
- if (RegsOut.w.ax == 0)
- {
- // Return extended memory size in K
- MemorySize = RegsOut.w.dx * 64;
- MemorySize += RegsOut.w.cx;
- return MemorySize;
- }
- else
- {
- // Return extended memory size in K
- MemorySize = RegsOut.w.bx * 64;
- MemorySize += RegsOut.w.ax;
- return MemorySize;
- }
- }
-
- // If we get here then Int15 Func E801h didn't work
- // So try Int15 Func 88h
-
- // Int 15h AH=88h
- // SYSTEM - GET EXTENDED MEMORY SIZE (286+)
- //
- // AH = 88h
- // Return:
- // CF clear if successful
- // AX = number of contiguous KB starting at absolute address 100000h
- // CF set on error
- // AH = status
- // 80h invalid command (PC,PCjr)
- // 86h unsupported function (XT,PS30)
- RegsIn.b.ah = 0x88;
- Int386(0x15, &RegsIn, &RegsOut);
-
- DbgPrint((DPRINT_MEMORY, "Int15h AH=88h\n"));
- DbgPrint((DPRINT_MEMORY, "AX = 0x%x\n", RegsOut.w.ax));
- DbgPrint((DPRINT_MEMORY, "CF set = %s\n\n", (RegsOut.x.eflags & I386FLAG_CF) ? "TRUE" : "FALSE"));
-
- if (INT386_SUCCESS(RegsOut) && RegsOut.w.ax != 0)
- {
- MemorySize = RegsOut.w.ax;
- return MemorySize;
- }
-
- // If we get here then Int15 Func 88h didn't work
- // So try reading the CMOS
- WRITE_PORT_UCHAR((PUCHAR)0x70, 0x31);
- MemorySize = READ_PORT_UCHAR((PUCHAR)0x71);
- MemorySize = (MemorySize & 0xFFFF);
- MemorySize = (MemorySize << 8);
-
- DbgPrint((DPRINT_MEMORY, "Int15h Failed\n"));
- DbgPrint((DPRINT_MEMORY, "CMOS reports: 0x%x\n", MemorySize));
-
- return MemorySize;
-}
-
-U32 GetConventionalMemorySize(VOID)
-{
- REGS Regs;
-
- DbgPrint((DPRINT_MEMORY, "GetConventionalMemorySize()\n"));
-
- // Int 12h
- // BIOS - GET MEMORY SIZE
- //
- // Return:
- // AX = kilobytes of contiguous memory starting at absolute address 00000h
- //
- // This call returns the contents of the word at 0040h:0013h;
- // in PC and XT, this value is set from the switches on the motherboard
- Regs.w.ax = 0;
- Int386(0x12, &Regs, &Regs);
-
- DbgPrint((DPRINT_MEMORY, "Int12h\n"));
- DbgPrint((DPRINT_MEMORY, "AX = 0x%x\n\n", Regs.w.ax));
-
- return (U32)Regs.w.ax;
-}
-
-U32 GetBiosMemoryMap(PBIOS_MEMORY_MAP BiosMemoryMap, U32 MaxMemoryMapSize)
-{
- REGS Regs;
- U32 MapCount;
-
- DbgPrint((DPRINT_MEMORY, "GetBiosMemoryMap()\n"));
-
- // Int 15h AX=E820h
- // Newer BIOSes - GET SYSTEM MEMORY MAP
- //
- // AX = E820h
- // EAX = 0000E820h
- // EDX = 534D4150h ('SMAP')
- // EBX = continuation value or 00000000h to start at beginning of map
- // ECX = size of buffer for result, in bytes (should be >= 20 bytes)
- // ES:DI -> buffer for result
- // Return:
- // CF clear if successful
- // EAX = 534D4150h ('SMAP')
- // ES:DI buffer filled
- // EBX = next offset from which to copy or 00000000h if all done
- // ECX = actual length returned in bytes
- // CF set on error
- // AH = error code (86h)
- Regs.x.eax = 0x0000E820;
- Regs.x.edx = 0x534D4150; // ('SMAP')
- Regs.x.ebx = 0x00000000;
- Regs.x.ecx = sizeof(BIOS_MEMORY_MAP);
- Regs.w.es = BIOSCALLBUFSEGMENT;
- Regs.w.di = BIOSCALLBUFOFFSET;
- for (MapCount=0; MapCount<MaxMemoryMapSize; MapCount++)
- {
- Int386(0x15, &Regs, &Regs);
-
- DbgPrint((DPRINT_MEMORY, "Memory Map Entry %d\n", MapCount));
- DbgPrint((DPRINT_MEMORY, "Int15h AX=E820h\n"));
- DbgPrint((DPRINT_MEMORY, "EAX = 0x%x\n", Regs.x.eax));
- DbgPrint((DPRINT_MEMORY, "EBX = 0x%x\n", Regs.x.ebx));
- DbgPrint((DPRINT_MEMORY, "ECX = 0x%x\n", Regs.x.ecx));
- DbgPrint((DPRINT_MEMORY, "CF set = %s\n", (Regs.x.eflags & I386FLAG_CF) ? "TRUE" : "FALSE"));
-
- // If the BIOS didn't return 'SMAP' in EAX then
- // it doesn't support this call
- if (Regs.x.eax != 0x534D4150)
- {
- break;
- }
-
- // Copy data to caller's buffer
- RtlCopyMemory(&BiosMemoryMap[MapCount], (PVOID)BIOSCALLBUFFER, Regs.x.ecx);
-
- DbgPrint((DPRINT_MEMORY, "BaseAddress: 0x%x%x\n", BiosMemoryMap[MapCount].BaseAddress));
- DbgPrint((DPRINT_MEMORY, "Length: 0x%x%x\n", BiosMemoryMap[MapCount].Length));
- DbgPrint((DPRINT_MEMORY, "Type: 0x%x\n", BiosMemoryMap[MapCount].Type));
- DbgPrint((DPRINT_MEMORY, "Reserved: 0x%x\n", BiosMemoryMap[MapCount].Reserved));
- DbgPrint((DPRINT_MEMORY, "\n"));
-
- // If the continuation value is zero or the
- // carry flag is set then this was
- // the last entry so we're done
- if (Regs.x.ebx == 0x00000000 || !INT386_SUCCESS(Regs))
- {
- MapCount++;
- DbgPrint((DPRINT_MEMORY, "End Of System Memory Map!\n\n"));
- break;
- }
-
- // Setup the registers for the next call
- Regs.x.eax = 0x0000E820;
- Regs.x.edx = 0x534D4150; // ('SMAP')
- //Regs.x.ebx = 0x00000001; // Continuation value already set by the BIOS
- Regs.x.ecx = sizeof(BIOS_MEMORY_MAP);
- Regs.w.es = BIOSCALLBUFSEGMENT;
- Regs.w.di = BIOSCALLBUFOFFSET;
- }
-
- return MapCount;
-}
projects / reactos.git / blobdiff