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[NTVDM]: Add a write-protect ROM helper and use it when possible external ROMs are loaded.

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svn path=/trunk/; revision=68419
This commit is contained in:
Hermès Bélusca-Maïto
2015-07-18 23:46:22 +00:00
parent 3d9861826c
commit 027dd2f4f0
3 changed files with 41 additions and 22 deletions
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reactos/subsystems/mvdm/ntvdm/bios/bios.c
+3 -12
View File
@@ -12,7 +12,6 @@
#include "ntvdm.h"
#include "emulator.h"
#include "memory.h"
#include "cpu/callback.h"
#include "cpu/bop.h"
@@ -42,12 +41,6 @@ PBIOS_CONFIG_TABLE Bct;
/* PRIVATE FUNCTIONS **********************************************************/
static BOOLEAN FASTCALL BiosRomWrite(ULONG Address, PVOID Buffer, ULONG Size)
{
/* Prevent writing to ROM */
return FALSE;
}
/* PUBLIC FUNCTIONS ***********************************************************/
VOID WINAPI BiosEquipmentService(LPWORD Stack)
@@ -82,11 +75,6 @@ BiosInitialize(IN LPCSTR BiosFileName)
// RegisterBop(BOP_EQUIPLIST , BiosEquipmentService);
// RegisterBop(BOP_GETMEMSIZE, BiosGetMemorySize);
MemInstallFastMemoryHook((PVOID)ROM_AREA_START,
ROM_AREA_END - ROM_AREA_START + 1,
NULL,
BiosRomWrite);
if (BiosFileName && BiosFileName[0] != '\0')
{
PVOID BiosLocation = NULL;
@@ -138,6 +126,9 @@ BiosInitialize(IN LPCSTR BiosFileName)
}
else
{
WriteProtectRom((PVOID)ROM_AREA_START,
ROM_AREA_END - ROM_AREA_START + 1);
Success = Bios32Loaded = Bios32Initialize();
}
reactos/subsystems/mvdm/ntvdm/bios/rom.c
+34 -10
View File
@@ -12,6 +12,7 @@
#include "ntvdm.h"
#include "emulator.h"
#include "memory.h"
#include "cpu/callback.h"
#include "rom.h"
@@ -19,6 +20,12 @@
/* PRIVATE FUNCTIONS **********************************************************/
static BOOLEAN FASTCALL ShadowRomWrite(ULONG Address, PVOID Buffer, ULONG Size)
{
/* Prevent writing to ROM */
return FALSE;
}
static HANDLE
OpenRomFile(IN PCSTR RomFileName,
OUT PULONG RomSize OPTIONAL)
@@ -96,7 +103,7 @@ InitRomRange(IN PCALLBACK16 Context,
IN ULONG End,
IN ULONG Increment)
{
ULONG Address, AddressBoot;
ULONG Address, EntryPoint;
ULONG RomSize;
UCHAR Checksum;
@@ -120,20 +127,20 @@ InitRomRange(IN PCALLBACK16 Context,
Checksum = ComputeChecksum(Address, RomSize);
if (Checksum == 0x00)
{
AddressBoot = Address + 3;
DPRINT1("Going to run @ address 0x%p\n", AddressBoot);
EntryPoint = Address + 3;
DPRINT1("Going to run @ address 0x%p\n", EntryPoint);
AddressBoot = MAKELONG((AddressBoot & 0xFFFF), (AddressBoot & 0xF0000) >> 4);
EntryPoint = MAKELONG((EntryPoint & 0xFFFF), (EntryPoint & 0xF0000) >> 4);
// setDS((Address & 0xF0000) >> 4);
setDS((Address & 0xFF000) >> 4);
RunCallback16(Context, AddressBoot);
// Call16((AddressBoot & 0xF0000) >> 4, (AddressBoot & 0xFFFF));
RunCallback16(Context, EntryPoint);
// Call16((EntryPoint & 0xF0000) >> 4, (EntryPoint & 0xFFFF));
DPRINT1("Rom @ address 0x%p initialized\n", Address);
DPRINT1("ROM @ address 0x%p initialized\n", Address);
}
else
{
DPRINT1("Rom @ address 0x%p has invalid checksum of 0x%02x\n", Address, Checksum);
DPRINT1("ROM @ address 0x%p has invalid checksum of 0x%02x\n", Address, Checksum);
}
}
}
@@ -141,6 +148,14 @@ InitRomRange(IN PCALLBACK16 Context,
/* PUBLIC FUNCTIONS ***********************************************************/
BOOLEAN
WriteProtectRom(IN PVOID RomLocation,
IN ULONG RomSize)
{
return MemInstallFastMemoryHook(RomLocation, RomSize,
NULL, ShadowRomWrite);
}
BOOLEAN
LoadBios(IN PCSTR BiosFileName,
OUT PVOID* BiosLocation OPTIONAL,
@@ -171,9 +186,14 @@ LoadBios(IN PCSTR BiosFileName,
/* Close the BIOS image file */
FileClose(hBiosFile);
/* In case of success, return BIOS location and size if needed */
/*
* In case of success, write-protect the BIOS location
* and return the BIOS location and its size if needed.
*/
if (Success)
{
WriteProtectRom(pBiosLocation, ulBiosSize);
if (BiosLocation) *BiosLocation = pBiosLocation;
if (BiosSize) *BiosSize = ulBiosSize;
}
@@ -206,9 +226,13 @@ LoadRom(IN PCSTR RomFileName,
/* Close the ROM image file and return */
FileClose(hRomFile);
/* In case of success, return ROM size if needed */
/*
* In case of success, write-protect the ROM location
* and return the ROM size if needed.
*/
if (Success)
{
WriteProtectRom(RomLocation, ulRomSize);
if (RomSize) *RomSize = ulRomSize;
}
reactos/subsystems/mvdm/ntvdm/bios/rom.h
+4
View File
@@ -18,6 +18,10 @@
/* FUNCTIONS ******************************************************************/
BOOLEAN
WriteProtectRom(IN PVOID RomLocation,
IN ULONG RomSize);
BOOLEAN
LoadBios(IN PCSTR BiosFileName,
OUT PVOID* BiosLocation OPTIONAL,