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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
debugsup.c
Abstract:
This module contains routines which provide support for the
kernel debugger.
Author:
Lou Perazzoli (loup) 02-Aug-90
Revision History:
--*/
#include "mi.h"
PVOID
MmDbgReadCheck (
IN PVOID VirtualAddress
)
/*++
Routine Description:
MIPS implementation specific:
This routine returns the virtual address which is valid (mapped)
for read access.
If the address is valid and readable and not within KSEG0 or KSEG1
the physical address within KSEG0 is returned. If the adddress
is within KSEG0 or KSEG1 then the called address is returned.
Arguments:
VirtualAddress - Supplies the virtual address to check.
Return Value:
Returns NULL if the address is not valid or readable, otherwise
returns the physical address of the corresponding virtual address.
Environment:
Kernel mode IRQL at DISPATCH_LEVEL or greater.
--*/
{
if ((VirtualAddress >= (PVOID)KSEG0_BASE) &&
(VirtualAddress < (PVOID)KSEG2_BASE)) {
return VirtualAddress;
}
if (!MmIsAddressValid (VirtualAddress)) {
if (KiProbeEntryTb(VirtualAddress)) {
return VirtualAddress;
}
return NULL;
}
return VirtualAddress;
}
PVOID
MmDbgWriteCheck (
IN PVOID VirtualAddress
)
/*++
Routine Description:
MIPS implementation specific:
This routine returns the phyiscal address for a virtual address
which is valid (mapped) for write access.
If the address is valid and writable and not within KSEG0 or KSEG1
the physical address within KSEG0 is returned. If the adddress
is within KSEG0 or KSEG1 then the called address is returned.
NOTE: The physical address is must only be used while the interrupt
level on ALL processors is above DISPATCH_LEVEL, otherwise the
binding between the virtual address and the physical address can
change due to paging.
Arguments:
VirtualAddress - Supplies the virtual address to check.
Return Value:
Returns NULL if the address is not valid or readable, otherwise
returns the physical address of the corresponding virtual address.
Environment:
Kernel mode IRQL at DISPATCH_LEVEL or greater.
--*/
{
PMMPTE PointerPte;
if ((VirtualAddress >= (PVOID)KSEG0_BASE) &&
(VirtualAddress < (PVOID)KSEG2_BASE)) {
return VirtualAddress;
}
if (!MmIsAddressValid (VirtualAddress)) {
//
// need to check write
//
if (KiProbeEntryTb(VirtualAddress)) {
return VirtualAddress;
}
return NULL;
}
PointerPte = MiGetPteAddress (VirtualAddress);
if ((ULONG) VirtualAddress < KSEG0_BASE && PointerPte->u.Hard.Dirty == 0) {
return NULL;
}
return VirtualAddress;
}
PVOID
MmDbgTranslatePhysicalAddress (
IN PHYSICAL_ADDRESS PhysicalAddress
)
/*++
Routine Description:
MIPS implementation specific:
This routine maps the specified physical address and returns
the virtual address which maps the physical address.
The next call to MmDbgTranslatePhyiscalAddress removes the
previous phyiscal address translation, hence on a single
physical address can be examined at a time (can't cross page
boundaries).
Arguments:
PhysicalAddress - Supplies the phyiscal address to map and translate.
Return Value:
The virtual address which corresponds to the phyiscal address.
NULL if the physical address was bogus.
Environment:
Kernel mode IRQL at DISPATCH_LEVEL or greater.
--*/
{
PVOID BaseAddress;
PMMPTE BasePte;
PMMPFN Pfn1;
ULONG Page;
BasePte = MmDebugPte + (MM_NUMBER_OF_COLORS - 1);
BasePte = (PMMPTE)((ULONG)BasePte & ~(MM_COLOR_MASK << PTE_SHIFT));
Page = (ULONG)(PhysicalAddress.QuadPart >> PAGE_SHIFT);
if ((Page > (LONGLONG)MmHighestPhysicalPage) ||
(Page < (LONGLONG)MmLowestPhysicalPage)) {
return NULL;
}
Pfn1 = MI_PFN_ELEMENT (Page);
if (!MmIsAddressValid (Pfn1)) {
return NULL;
}
BasePte = BasePte + Pfn1->u3.e1.PageColor;
BaseAddress = MiGetVirtualAddressMappedByPte (BasePte);
KiFlushSingleTb (TRUE, BaseAddress);
*BasePte = ValidKernelPte;
BasePte->u.Hard.PageFrameNumber = Page;
return (PVOID)((ULONG)BaseAddress + BYTE_OFFSET(PhysicalAddress.LowPart));
}
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