ReactOS 0.4.15-dev-8145-ga541a46
kdmemsup.c
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1/*****************************************************************************\
2 * *
3 * This file is current kept ONLY for DOCUMENTATION purposes, until *
4 * we are sure that all the functionality (e.g. regarding the "big pages") *
5 * are fully present in Mm and in mm/ARM3/mmdbg.c that supersedes this file. *
6 * *
7\*****************************************************************************/
8
9/*
10 * COPYRIGHT: See COPYING in the top level directory
11 * PROJECT: ReactOS Kernel
12 * PURPOSE: Kernel Debugger Safe Memory Support
13 *
14 * PROGRAMMERS: arty
15 */
16
17#include <ntoskrnl.h>
18
19#define HIGH_PHYS_MASK 0x80000000
20#define PAGE_TABLE_MASK 0x3ff
21#define BIG_PAGE_SIZE (1<<22)
22#define CR4_PAGE_SIZE_BIT 0x10
23#define PDE_PRESENT_BIT 0x01
24#define PDE_W_BIT 0x02
25#define PDE_PWT_BIT 0x08
26#define PDE_PCD_BIT 0x10
27#define PDE_ACCESSED_BIT 0x20
28#define PDE_DIRTY_BIT 0x40
29#define PDE_PS_BIT 0x80
30
31#define MI_KDBG_TMP_PAGE_1 (HYPER_SPACE + 0x400000 - PAGE_SIZE)
32#define MI_KDBG_TMP_PAGE_0 (MI_KDBG_TMP_PAGE_1 - PAGE_SIZE)
33
34/* VARIABLES ***************************************************************/
35
37
38static
41{
43 PMMPTE PointerPte;
44 ULONG_PTR VirtAddr;
45
48
49 if ((PhysAddr & (PAGE_SIZE - 1)) + Len > PAGE_SIZE)
50 {
51 TempPte.u.Hard.PageFrameNumber = (PhysAddr >> PAGE_SHIFT) + 1;
53 *PointerPte = TempPte;
54 VirtAddr = (ULONG_PTR)PointerPte << 10;
55 KeInvalidateTlbEntry((PVOID)VirtAddr);
56 }
57
58 TempPte.u.Hard.PageFrameNumber = PhysAddr >> PAGE_SHIFT;
60 *PointerPte = TempPte;
61 VirtAddr = (ULONG_PTR)PointerPte << 10;
62 KeInvalidateTlbEntry((PVOID)VirtAddr);
63
64 return VirtAddr + (PhysAddr & (PAGE_SIZE - 1));
65}
66
67static
70{
71 ULONG_PTR Addr;
72 ULONGLONG Result = 0;
73
74 Addr = KdpPhysMap(PhysAddr, Len);
75
76 switch (Len)
77 {
78 case 8:
79 Result = *((PULONGLONG)Addr);
80 break;
81 case 4:
82 Result = *((PULONG)Addr);
83 break;
84 case 2:
85 Result = *((PUSHORT)Addr);
86 break;
87 case 1:
88 Result = *((PUCHAR)Addr);
89 break;
90 }
91
92 return Result;
93}
94
95static
96VOID
98{
99 ULONG_PTR Addr;
100
101 Addr = KdpPhysMap(PhysAddr, Len);
102
103 switch (Len)
104 {
105 case 8:
106 *((PULONGLONG)Addr) = Value;
107 break;
108 case 4:
109 *((PULONG)Addr) = Value;
110 break;
111 case 2:
112 *((PUSHORT)Addr) = Value;
113 break;
114 case 1:
115 *((PUCHAR)Addr) = Value;
116 break;
117 }
118}
119
120static
123{
124 ULONG_PTR CR3Value = __readcr3();
125 ULONG_PTR CR4Value = __readcr4();
126 ULONG_PTR PageDirectory = (CR3Value & ~(PAGE_SIZE-1)) +
127 ((Addr >> 22) * sizeof(ULONG));
128 ULONG_PTR PageDirectoryEntry = KdpPhysRead(PageDirectory, sizeof(ULONG));
129
130 /* Not present -> fail */
131 if (!(PageDirectoryEntry & PDE_PRESENT_BIT))
132 {
133 return FALSE;
134 }
135
136 /* Big Page? */
137 if ((PageDirectoryEntry & PDE_PS_BIT) && (CR4Value & CR4_PAGE_SIZE_BIT))
138 {
139 *ResultAddr = (PageDirectoryEntry & ~(BIG_PAGE_SIZE-1)) +
140 (Addr & (BIG_PAGE_SIZE-1));
141 return TRUE;
142 }
143 else
144 {
145 ULONG_PTR PageTableAddr =
146 (PageDirectoryEntry & ~(PAGE_SIZE-1)) +
147 ((Addr >> PAGE_SHIFT) & PAGE_TABLE_MASK) * sizeof(ULONG);
148 ULONG_PTR PageTableEntry = KdpPhysRead(PageTableAddr, sizeof(ULONG));
149 if (PageTableEntry & PDE_PRESENT_BIT)
150 {
151 *ResultAddr = (PageTableEntry & ~(PAGE_SIZE-1)) +
152 (Addr & (PAGE_SIZE-1));
153 return TRUE;
154 }
155 }
156
157 return FALSE;
158}
159
161NTAPI
163{
164 ULONG_PTR ResultPhysAddr;
165
166 if (!KdpPhysAccess)
167 {
168 memcpy(Value, (PVOID)Addr, Len);
169 return TRUE;
170 }
171
172 memset(Value, 0, Len);
173
174 if (!KdpTranslateAddress(Addr, &ResultPhysAddr))
175 return FALSE;
176
177 switch (Len)
178 {
179 case 8:
180 *((PULONGLONG)Value) = KdpPhysRead(ResultPhysAddr, Len);
181 break;
182 case 4:
183 *((PULONG)Value) = KdpPhysRead(ResultPhysAddr, Len);
184 break;
185 case 2:
186 *((PUSHORT)Value) = KdpPhysRead(ResultPhysAddr, Len);
187 break;
188 case 1:
189 *((PUCHAR)Value) = KdpPhysRead(ResultPhysAddr, Len);
190 break;
191 }
192
193 return TRUE;
194}
195
197NTAPI
199{
200 ULONG_PTR ResultPhysAddr;
201
202 if (!KdpPhysAccess)
203 {
204 memcpy((PVOID)Addr, &Value, Len);
205 return TRUE;
206 }
207
208 if (!KdpTranslateAddress(Addr, &ResultPhysAddr))
209 return FALSE;
210
211 KdpPhysWrite(ResultPhysAddr, Len, Value);
212 return TRUE;
213}
214
215VOID
216NTAPI
218{
220}
221
222/* EOF */
unsigned char BOOLEAN
HARDWARE_PTE_ARMV6 TempPte
Definition: winldr.c:76
#define Len
Definition: deflate.h:82
#define TRUE
Definition: types.h:120
#define FALSE
Definition: types.h:117
#define ULONG_PTR
Definition: config.h:101
#define PAGE_SIZE
Definition: env_spec_w32.h:49
#define PAGE_SHIFT
Definition: env_spec_w32.h:45
__INTRIN_INLINE unsigned long __readcr3(void)
Definition: intrin_x86.h:1818
__INTRIN_INLINE unsigned long __readcr4(void)
Definition: intrin_x86.h:1825
#define PDE_PRESENT_BIT
Definition: kdmemsup.c:23
BOOLEAN NTAPI KdpSafeWriteMemory(ULONG_PTR Addr, LONG Len, ULONGLONG Value)
Definition: kdmemsup.c:198
#define PDE_PWT_BIT
Definition: kdmemsup.c:25
#define CR4_PAGE_SIZE_BIT
Definition: kdmemsup.c:22
#define PAGE_TABLE_MASK
Definition: kdmemsup.c:20
#define PDE_DIRTY_BIT
Definition: kdmemsup.c:28
static VOID KdpPhysWrite(ULONG_PTR PhysAddr, LONG Len, ULONGLONG Value)
Definition: kdmemsup.c:97
static BOOLEAN KdpTranslateAddress(ULONG_PTR Addr, PULONG_PTR ResultAddr)
Definition: kdmemsup.c:122
#define MI_KDBG_TMP_PAGE_1
Definition: kdmemsup.c:31
static ULONGLONG KdpPhysRead(ULONG_PTR PhysAddr, LONG Len)
Definition: kdmemsup.c:69
#define PDE_ACCESSED_BIT
Definition: kdmemsup.c:27
#define BIG_PAGE_SIZE
Definition: kdmemsup.c:21
static BOOLEAN KdpPhysAccess
Definition: kdmemsup.c:36
BOOLEAN NTAPI KdpSafeReadMemory(ULONG_PTR Addr, LONG Len, PVOID Value)
Definition: kdmemsup.c:162
#define PDE_W_BIT
Definition: kdmemsup.c:24
VOID NTAPI KdpEnableSafeMem(VOID)
Definition: kdmemsup.c:217
#define MI_KDBG_TMP_PAGE_0
Definition: kdmemsup.c:32
static ULONG_PTR KdpPhysMap(ULONG_PTR PhysAddr, LONG Len)
Definition: kdmemsup.c:40
#define PDE_PCD_BIT
Definition: kdmemsup.c:26
#define PDE_PS_BIT
Definition: kdmemsup.c:29
#define memcpy(s1, s2, n)
Definition: mkisofs.h:878
#define MiAddressToPte(x)
Definition: mmx86.c:19
__GNU_EXTENSION typedef unsigned __int64 * PULONGLONG
Definition: ntbasedef.h:383
FORCEINLINE VOID KeInvalidateTlbEntry(IN PVOID Address)
Definition: ke.h:264
long LONG
Definition: pedump.c:60
#define memset(x, y, z)
Definition: compat.h:39
ULONG PageFrameNumber
Definition: mmtypes.h:109
uint32_t * PULONG_PTR
Definition: typedefs.h:65
uint32_t * PULONG
Definition: typedefs.h:59
#define NTAPI
Definition: typedefs.h:36
uint16_t * PUSHORT
Definition: typedefs.h:56
uint32_t ULONG_PTR
Definition: typedefs.h:65
unsigned char * PUCHAR
Definition: typedefs.h:53
uint32_t ULONG
Definition: typedefs.h:59
uint64_t ULONGLONG
Definition: typedefs.h:67
_Must_inspect_result_ _In_ WDFKEY _In_ PCUNICODE_STRING _Out_opt_ PUSHORT _Inout_opt_ PUNICODE_STRING Value
Definition: wdfregistry.h:413
_At_(*)(_In_ PWSK_CLIENT Client, _In_opt_ PUNICODE_STRING NodeName, _In_opt_ PUNICODE_STRING ServiceName, _In_opt_ ULONG NameSpace, _In_opt_ GUID *Provider, _In_opt_ PADDRINFOEXW Hints, _Outptr_ PADDRINFOEXW *Result, _In_opt_ PEPROCESS OwningProcess, _In_opt_ PETHREAD OwningThread, _Inout_ PIRP Irp Result)(Mem)) NTSTATUS(WSKAPI *PFN_WSK_GET_ADDRESS_INFO
Definition: wsk.h:409