1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
|
/* $Id: bs3-cmn-PagingProtect.c $ */
/** @file
* BS3Kit - Bs3PagingProtect
*/
/*
* Copyright (C) 2007-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "bs3kit-template-header.h"
#include "bs3-cmn-paging.h"
#include <iprt/asm-amd64-x86.h>
#include <iprt/param.h>
/*********************************************************************************************************************************
* Defined Constants And Macros *
*********************************************************************************************************************************/
#if 0
# define BS3PAGING_DPRINTF1(a) Bs3TestPrintf a
#else
# define BS3PAGING_DPRINTF1(a) do { } while (0)
#endif
#if 0
# define BS3PAGING_DPRINTF2(a) Bs3TestPrintf a
#else
# define BS3PAGING_DPRINTF2(a) do { } while (0)
#endif
static void *bs3PagingBuildPaeTable(uint64_t uTmpl, uint64_t cbIncrement, BS3MEMKIND enmKind, int *prc)
{
uint64_t BS3_FAR *pau64 = (uint64_t BS3_FAR *)Bs3MemAlloc(enmKind, _4K);
if (pau64)
{
unsigned i;
for (i = 0; i < _4K / sizeof(uint64_t); i++, uTmpl += cbIncrement)
pau64[i] = uTmpl;
}
else
*prc = VERR_NO_MEMORY;
return pau64;
}
#undef bs3PagingGetLegacyPte
BS3_CMN_DEF(X86PTE BS3_FAR *, bs3PagingGetLegacyPte,(RTCCUINTXREG cr3, uint32_t uFlat, bool fUseInvlPg, int *prc))
{
X86PTE BS3_FAR *pPTE = NULL;
#if TMPL_BITS == 16
uint32_t const uMaxAddr = BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode) ? _1M - 1 : BS3_SEL_TILED_AREA_SIZE - 1;
#else
uint32_t const uMaxAddr = UINT32_MAX;
#endif
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: cr3=%RX32 uFlat=%RX32 uMaxAddr=%RX32\n", (uint32_t)cr3, uFlat, uMaxAddr));
*prc = VERR_OUT_OF_RANGE;
if (cr3 <= uMaxAddr)
{
unsigned const iPde = (uFlat >> X86_PD_SHIFT) & X86_PD_MASK;
PX86PD const pPD = (PX86PD)Bs3XptrFlatToCurrent(cr3 & X86_CR3_PAGE_MASK);
BS3_ASSERT(pPD->a[iPde].b.u1Present);
if (pPD->a[iPde].b.u1Present)
{
unsigned const iPte = (uFlat >> X86_PT_SHIFT) & X86_PT_MASK;
BS3_ASSERT(pPD->a[iPde].b.u1Present);
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: pPD=%p iPde=%#x: %#RX32\n", pPD, iPde, pPD->a[iPde]));
if (pPD->a[iPde].b.u1Present)
{
if (!pPD->a[iPde].b.u1Size)
{
if (pPD->a[iPde].u <= uMaxAddr)
pPTE = &((X86PT BS3_FAR *)Bs3XptrFlatToCurrent(pPD->a[iPde].u & ~(uint32_t)PAGE_OFFSET_MASK))->a[iPte];
else
BS3PAGING_DPRINTF1(("bs3PagingGetLegacyPte: out of range! iPde=%#x: %#x\n", iPde, pPD->a[iPde].u));
}
else
{
X86PT BS3_FAR *pPT;
uint32_t uPte = (pPD->a[iPde].u & ~(uint32_t)(X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_PG_HIGH_MASK)) \
| X86_PTE_D;
if (pPD->a[iPde].b.u1Global)
uPte |= X86_PTE_G;
if (pPD->a[iPde].b.u1PAT)
uPte |= X86_PTE_PAT;
pPT = (X86PT BS3_FAR *)bs3PagingBuildPaeTable(RT_MAKE_U64(uPte, uPte | PAGE_SIZE),
RT_MAKE_U64(PAGE_SIZE*2, PAGE_SIZE*2),
uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: Built pPT=%p uPte=%RX32\n", pPT, uPte));
if (pPT)
{
ASMAtomicUoWriteU32(&pPD->a[iPde].u,
Bs3SelPtrToFlat(pPT)
| ( pPD->a[iPde].u
& ~(uint32_t)(X86_PTE_PG_MASK | X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_D)));
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: iPde=%#x: %#RX32\n", iPde, pPD->a[iPde].u));
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPTE = &pPT->a[iPte];
}
}
}
}
}
else
BS3PAGING_DPRINTF1(("bs3PagingGetLegacyPte: out of range! cr3=%#x\n", cr3));
return pPTE;
}
/**
* Get the PTE for an address, given a PAE or long mode CR3.
*
* @returns Pointer to the PTE on success, NULL on failure.
* @param cr3 The CR3.
* @param bMode Indicates whether it's PAE or long mode.
* @param uFlat The address for which we want the PTE.
* @param fUseInvlPg Whether we can use invalidate page when
* replacing large pages.
* @param prc Updated only on failure.
*/
#undef bs3PagingGetPaePte
BS3_CMN_DEF(X86PTEPAE BS3_FAR *, bs3PagingGetPaePte,(RTCCUINTXREG cr3, uint8_t bMode, uint64_t uFlat, bool fUseInvlPg, int *prc))
{
X86PTEPAE BS3_FAR *pPTE = NULL;
#if TMPL_BITS == 16
uint32_t const uMaxAddr = BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode) ? _1M - 1 : BS3_SEL_TILED_AREA_SIZE - 1;
#else
uintptr_t const uMaxAddr = ~(uintptr_t)0;
#endif
*prc = VERR_OUT_OF_RANGE;
if ((cr3 & X86_CR3_AMD64_PAGE_MASK) <= uMaxAddr)
{
X86PDPAE BS3_FAR *pPD;
if (BS3_MODE_IS_64BIT_SYS(bMode))
{
unsigned const iPml4e = (uFlat >> X86_PML4_SHIFT) & X86_PML4_MASK;
X86PML4 BS3_FAR *pPml4 = (X86PML4 BS3_FAR *)Bs3XptrFlatToCurrent(cr3 & X86_CR3_AMD64_PAGE_MASK);
BS3_ASSERT(pPml4->a[iPml4e].n.u1Present);
if ((pPml4->a[iPml4e].u & X86_PML4E_PG_MASK) <= uMaxAddr)
{
unsigned const iPdpte = (uFlat >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64;
X86PDPT BS3_FAR *pPdpt = (X86PDPT BS3_FAR *)Bs3XptrFlatToCurrent(pPml4->a[iPml4e].u & X86_PML4E_PG_MASK);
BS3_ASSERT(pPdpt->a[iPdpte].n.u1Present);
if (!pPdpt->a[iPdpte].b.u1Size)
{
if ((pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK) <= uMaxAddr)
pPD = (X86PDPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPdpt->a[iPdpte].u & ~(uint64_t)PAGE_OFFSET_MASK);
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPdpte=%#x: %RX64 max=%RX32\n",
iPdpte, pPdpt->a[iPdpte].u, (uint32_t)uMaxAddr));
}
else
{
/* Split 1GB page. */
pPD = (X86PDPAE BS3_FAR *)bs3PagingBuildPaeTable(pPdpt->a[iPdpte].u, _2M,
uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
if (pPD)
{
ASMAtomicUoWriteU64(&pPdpt->a[iPdpte].u,
Bs3SelPtrToFlat(pPD)
| ( pPdpt->a[iPdpte].u
& ~(uint64_t)(X86_PDPE_PG_MASK | X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_D)));
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
}
}
}
}
//else if (uFlat <= UINT32_MAX) - fixme!
else if (!(uFlat >> 32))
{
unsigned const iPdpte = ((uint32_t)uFlat >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE;
X86PDPT BS3_FAR *pPdpt = (X86PDPT BS3_FAR *)Bs3XptrFlatToCurrent(cr3 & X86_CR3_PAE_PAGE_MASK);
BS3_ASSERT(pPdpt->a[iPdpte].n.u1Present);
if ((pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK) <= uMaxAddr)
pPD = (X86PDPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK);
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPdpte=%#x: %RX64 max=%RX32\n",
iPdpte, pPdpt->a[iPdpte].u, (uint32_t)uMaxAddr));
}
else
{
pPD = NULL;
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! uFlat=%#RX64 max=%RX32\n", uFlat, (uint32_t)uMaxAddr));
}
if (pPD)
{
unsigned const iPte = (uFlat >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK;
unsigned const iPde = (uFlat >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK;
if (!pPD->a[iPde].b.u1Size)
{
if ((pPD->a[iPde].u & X86_PDE_PAE_PG_MASK) <= uMaxAddr)
pPTE = &((X86PTPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPD->a[iPde].u & ~(uint64_t)PAGE_OFFSET_MASK))->a[iPte];
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPde=%#x: %RX64 max=%RX32\n",
iPde, pPD->a[iPde].u, (uint32_t)uMaxAddr));
}
else
{
/* Split 2MB page. */
X86PTPAE BS3_FAR *pPT;
uint64_t uTmpl = pPD->a[iPde].u & ~(uint64_t)(X86_PDE4M_G | X86_PDE4M_PS | X86_PDE4M_PAT);
if (!pPD->a[iPde].b.u1Global)
uTmpl |= X86_PTE_G;
if (!pPD->a[iPde].b.u1PAT)
uTmpl |= X86_PTE_PAT;
pPT = (X86PTPAE BS3_FAR *)bs3PagingBuildPaeTable(uTmpl, PAGE_SIZE,
uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
if (pPT)
{
ASMAtomicUoWriteU64(&pPD->a[iPde].u,
Bs3SelPtrToFlat(pPT)
| ( pPD->a[iPde].u
& ~(uint64_t)(X86_PTE_PAE_PG_MASK | X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_D)));
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPTE = &pPT->a[iPte];
}
}
}
}
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! cr3=%#RX32 uMaxAddr=%#RX32\n", (uint32_t)cr3, (uint32_t)uMaxAddr));
return pPTE;
}
#undef Bs3PagingProtect
BS3_CMN_DEF(int, Bs3PagingProtect,(uint64_t uFlat, uint64_t cb, uint64_t fSet, uint64_t fClear))
{
#if ARCH_BITS == 16
if (!BS3_MODE_IS_V86(g_bBs3CurrentMode))
#endif
{
RTCCUINTXREG const cr3 = ASMGetCR3();
RTCCUINTXREG const cr4 = g_uBs3CpuDetected & BS3CPU_F_CPUID ? ASMGetCR4() : 0;
bool const fLegacyPTs = !(cr4 & X86_CR4_PAE);
bool const fUseInvlPg = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486
&& ( cb < UINT64_C(16)*PAGE_SIZE
|| (cr4 & X86_CR4_PGE));
unsigned cEntries;
int rc;
/*
* Adjust the range parameters.
*/
cb += uFlat & PAGE_OFFSET_MASK;
cb = RT_ALIGN_64(cb, PAGE_SIZE);
uFlat &= ~(uint64_t)PAGE_OFFSET_MASK;
fSet &= ~X86_PTE_PAE_PG_MASK;
fClear &= ~X86_PTE_PAE_PG_MASK;
BS3PAGING_DPRINTF1(("Bs3PagingProtect: uFlat=%RX64 cb=%RX64 fSet=%RX64 fClear=%RX64 %s %s\n", uFlat, cb, fSet, fClear,
fLegacyPTs ? "legacy" : "pae/amd64", fUseInvlPg ? "invlpg" : "reload-cr3"));
if (fLegacyPTs)
{
/*
* Legacy page tables.
*/
while ((uint32_t)cb > 0)
{
PX86PTE pPte = BS3_CMN_FAR_NM(bs3PagingGetLegacyPte)(cr3, (uint32_t)uFlat, fUseInvlPg, &rc);
if (!pPte)
return rc;
cEntries = X86_PG_ENTRIES - ((uFlat >> X86_PT_SHIFT) & X86_PT_MASK);
while (cEntries-- > 0 && cb > 0)
{
pPte->u &= ~(uint32_t)fClear;
pPte->u |= (uint32_t)fSet;
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPte++;
uFlat += PAGE_SIZE;
cb -= PAGE_SIZE;
}
}
}
else
{
/*
* Long mode or PAE page tables (at this level they are the same).
*/
while (cb > 0)
{
PX86PTEPAE pPte = BS3_CMN_FAR_NM(bs3PagingGetPaePte)(cr3, g_bBs3CurrentMode, uFlat, fUseInvlPg, &rc);
if (!pPte)
return rc;
cEntries = X86_PG_ENTRIES - ((uFlat >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK);
while (cEntries-- > 0 && cb > 0)
{
pPte->u &= ~fClear;
pPte->u |= fSet;
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPte++;
uFlat += PAGE_SIZE;
cb -= PAGE_SIZE;
}
}
}
/*
* Flush the TLB if we didn't use INVLPG above.
*/
BS3PAGING_DPRINTF2(("Bs3PagingProtect: reloading cr3=%RX32\n", (uint32_t)cr3));
//if (!fUseInvlPg)
ASMSetCR3(cr3);
BS3PAGING_DPRINTF2(("Bs3PagingProtect: reloaded cr3=%RX32\n", (uint32_t)cr3));
}
#if ARCH_BITS == 16
/*
* We can do this stuff in v8086 mode.
*/
else
return Bs3SwitchFromV86To16BitAndCallC((FPFNBS3FAR)Bs3PagingProtect_f16, sizeof(uint64_t) * 4, uFlat, cb, fSet, fClear);
#endif
return VINF_SUCCESS;
}
#undef Bs3PagingProtectPtr
BS3_CMN_DEF(int, Bs3PagingProtectPtr,(void *pv, size_t cb, uint64_t fSet, uint64_t fClear))
{
#if ARCH_BITS == 16
return BS3_CMN_NM(Bs3PagingProtect)(Bs3SelPtrToFlat(pv), cb, fSet, fClear);
#else
return BS3_CMN_NM(Bs3PagingProtect)((uintptr_t)pv, cb, fSet, fClear);
#endif
}
#undef Bs3PagingGetPte
BS3_CMN_DEF(void BS3_FAR *, Bs3PagingGetPte,(uint64_t uFlat, int *prc))
{
RTCCUINTXREG const cr3 = ASMGetCR3();
RTCCUINTXREG const cr4 = g_uBs3CpuDetected & BS3CPU_F_CPUID ? ASMGetCR4() : 0;
bool const fLegacyPTs = !(cr4 & X86_CR4_PAE);
bool const fUseInvlPg = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486;
int rc;
if (!prc)
prc = &rc;
if (!fLegacyPTs)
return BS3_CMN_FAR_NM(bs3PagingGetPaePte)(cr3, g_bBs3CurrentMode, uFlat, fUseInvlPg, prc);
if (uFlat < _4G)
return BS3_CMN_FAR_NM(bs3PagingGetLegacyPte)(cr3, (uint32_t)uFlat, fUseInvlPg, prc);
*prc = VERR_OUT_OF_RANGE;
return NULL;
}
|
