bs3-cmn-PagingProtect.c@ 82968

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1	/* $Id: bs3-cmn-PagingProtect.c 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* BS3Kit - Bs3PagingProtect
4	*/
5
6	/*
7	* Copyright (C) 2007-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include "bs3kit-template-header.h"
32	#include "bs3-cmn-paging.h"
33	#include <iprt/asm-amd64-x86.h>
34	#include <iprt/param.h>
35
36
37	/*********************************************************************************************************************************
38	* Defined Constants And Macros *
39	*********************************************************************************************************************************/
40	#if 0
41	# define BS3PAGING_DPRINTF1(a) Bs3TestPrintf a
42	#else
43	# define BS3PAGING_DPRINTF1(a) do { } while (0)
44	#endif
45	#if 0
46	# define BS3PAGING_DPRINTF2(a) Bs3TestPrintf a
47	#else
48	# define BS3PAGING_DPRINTF2(a) do { } while (0)
49	#endif
50
51
52	static void bs3PagingBuildPaeTable(uint64_t uTmpl, uint64_t cbIncrement, BS3MEMKIND enmKind, int prc)
53	{
54	uint64_t BS3_FAR pau64 = (uint64_t BS3_FAR )Bs3MemAlloc(enmKind, _4K);
55	if (pau64)
56	{
57	unsigned i;
58	for (i = 0; i < _4K / sizeof(uint64_t); i++, uTmpl += cbIncrement)
59	pau64[i] = uTmpl;
60	}
61	else
62	*prc = VERR_NO_MEMORY;
63	return pau64;
64	}
65
66
67	#undef bs3PagingGetLegacyPte
68	BS3_CMN_DEF(X86PTE BS3_FAR , bs3PagingGetLegacyPte,(RTCCUINTXREG cr3, uint32_t uFlat, bool fUseInvlPg, int prc))
69	{
70	X86PTE BS3_FAR *pPTE = NULL;
71	#if TMPL_BITS == 16
72	uint32_t const uMaxAddr = BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode) ? _1M - 1 : BS3_SEL_TILED_AREA_SIZE - 1;
73	#else
74	uint32_t const uMaxAddr = UINT32_MAX;
75	#endif
76	BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: cr3=%RX32 uFlat=%RX32 uMaxAddr=%RX32\n", (uint32_t)cr3, uFlat, uMaxAddr));
77
78	*prc = VERR_OUT_OF_RANGE;
79	if (cr3 <= uMaxAddr)
80	{
81	unsigned const iPde = (uFlat >> X86_PD_SHIFT) & X86_PD_MASK;
82	PX86PD const pPD = (PX86PD)Bs3XptrFlatToCurrent(cr3 & X86_CR3_PAGE_MASK);
83
84	BS3_ASSERT(pPD->a[iPde].b.u1Present);
85	if (pPD->a[iPde].b.u1Present)
86	{
87	unsigned const iPte = (uFlat >> X86_PT_SHIFT) & X86_PT_MASK;
88
89	BS3_ASSERT(pPD->a[iPde].b.u1Present);
90	BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: pPD=%p iPde=%#x: %#RX32\n", pPD, iPde, pPD->a[iPde]));
91	if (pPD->a[iPde].b.u1Present)
92	{
93	if (!pPD->a[iPde].b.u1Size)
94	{
95	if (pPD->a[iPde].u <= uMaxAddr)
96	pPTE = &((X86PT BS3_FAR *)Bs3XptrFlatToCurrent(pPD->a[iPde].u & ~(uint32_t)PAGE_OFFSET_MASK))->a[iPte];
97	else
98	BS3PAGING_DPRINTF1(("bs3PagingGetLegacyPte: out of range! iPde=%#x: %#x\n", iPde, pPD->a[iPde].u));
99	}
100	else
101	{
102	X86PT BS3_FAR *pPT;
103	uint32_t uPte = (pPD->a[iPde].u & ~(uint32_t)(X86_PDE4M_PS \| X86_PDE4M_G \| X86_PDE4M_PG_HIGH_MASK)) \
104	\| X86_PTE_D;
105	if (pPD->a[iPde].b.u1Global)
106	uPte \|= X86_PTE_G;
107	if (pPD->a[iPde].b.u1PAT)
108	uPte \|= X86_PTE_PAT;
109
110	pPT = (X86PT BS3_FAR *)bs3PagingBuildPaeTable(RT_MAKE_U64(uPte, uPte \| PAGE_SIZE),
111	RT_MAKE_U64(PAGE_SIZE2, PAGE_SIZE2),
112	uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
113
114	BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: Built pPT=%p uPte=%RX32\n", pPT, uPte));
115	if (pPT)
116	{
117	ASMAtomicUoWriteU32(&pPD->a[iPde].u,
118	Bs3SelPtrToFlat(pPT)
119	\| ( pPD->a[iPde].u
120	& ~(uint32_t)(X86_PTE_PG_MASK \| X86_PDE4M_PS \| X86_PDE4M_G \| X86_PDE4M_D)));
121	BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: iPde=%#x: %#RX32\n", iPde, pPD->a[iPde].u));
122	if (fUseInvlPg)
123	ASMInvalidatePage(uFlat);
124	pPTE = &pPT->a[iPte];
125	}
126	}
127	}
128	}
129	}
130	else
131	BS3PAGING_DPRINTF1(("bs3PagingGetLegacyPte: out of range! cr3=%#x\n", cr3));
132	return pPTE;
133	}
134
135
136	/**
137	* Get the PTE for an address, given a PAE or long mode CR3.
138	*
139	* @returns Pointer to the PTE on success, NULL on failure.
140	* @param cr3 The CR3.
141	* @param bMode Indicates whether it's PAE or long mode.
142	* @param uFlat The address for which we want the PTE.
143	* @param fUseInvlPg Whether we can use invalidate page when
144	* replacing large pages.
145	* @param prc Updated only on failure.
146	*/
147	#undef bs3PagingGetPaePte
148	BS3_CMN_DEF(X86PTEPAE BS3_FAR , bs3PagingGetPaePte,(RTCCUINTXREG cr3, uint8_t bMode, uint64_t uFlat, bool fUseInvlPg, int prc))
149	{
150	X86PTEPAE BS3_FAR *pPTE = NULL;
151	#if TMPL_BITS == 16
152	uint32_t const uMaxAddr = BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode) ? _1M - 1 : BS3_SEL_TILED_AREA_SIZE - 1;
153	#else
154	uintptr_t const uMaxAddr = ~(uintptr_t)0;
155	#endif
156
157	*prc = VERR_OUT_OF_RANGE;
158	if ((cr3 & X86_CR3_AMD64_PAGE_MASK) <= uMaxAddr)
159	{
160	X86PDPAE BS3_FAR *pPD;
161	if (BS3_MODE_IS_64BIT_SYS(bMode))
162	{
163	unsigned const iPml4e = (uFlat >> X86_PML4_SHIFT) & X86_PML4_MASK;
164	X86PML4 BS3_FAR pPml4 = (X86PML4 BS3_FAR )Bs3XptrFlatToCurrent(cr3 & X86_CR3_AMD64_PAGE_MASK);
165	BS3_ASSERT(pPml4->a[iPml4e].n.u1Present);
166	if ((pPml4->a[iPml4e].u & X86_PML4E_PG_MASK) <= uMaxAddr)
167	{
168	unsigned const iPdpte = (uFlat >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64;
169	X86PDPT BS3_FAR pPdpt = (X86PDPT BS3_FAR )Bs3XptrFlatToCurrent(pPml4->a[iPml4e].u & X86_PML4E_PG_MASK);
170	BS3_ASSERT(pPdpt->a[iPdpte].n.u1Present);
171	if (!pPdpt->a[iPdpte].b.u1Size)
172	{
173	if ((pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK) <= uMaxAddr)
174	pPD = (X86PDPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPdpt->a[iPdpte].u & ~(uint64_t)PAGE_OFFSET_MASK);
175	else
176	BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPdpte=%#x: %RX64 max=%RX32\n",
177	iPdpte, pPdpt->a[iPdpte].u, (uint32_t)uMaxAddr));
178	}
179	else
180	{
181	/* Split 1GB page. */
182	pPD = (X86PDPAE BS3_FAR *)bs3PagingBuildPaeTable(pPdpt->a[iPdpte].u, _2M,
183	uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
184	if (pPD)
185	{
186	ASMAtomicUoWriteU64(&pPdpt->a[iPdpte].u,
187	Bs3SelPtrToFlat(pPD)
188	\| ( pPdpt->a[iPdpte].u
189	& ~(uint64_t)(X86_PDPE_PG_MASK \| X86_PDE4M_PS \| X86_PDE4M_G \| X86_PDE4M_D)));
190	if (fUseInvlPg)
191	ASMInvalidatePage(uFlat);
192	}
193	}
194	}
195	}
196	//else if (uFlat <= UINT32_MAX) - fixme!
197	else if (!(uFlat >> 32))
198	{
199	unsigned const iPdpte = ((uint32_t)uFlat >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE;
200	X86PDPT BS3_FAR pPdpt = (X86PDPT BS3_FAR )Bs3XptrFlatToCurrent(cr3 & X86_CR3_PAE_PAGE_MASK);
201	BS3_ASSERT(pPdpt->a[iPdpte].n.u1Present);
202	if ((pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK) <= uMaxAddr)
203	pPD = (X86PDPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK);
204	else
205	BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPdpte=%#x: %RX64 max=%RX32\n",
206	iPdpte, pPdpt->a[iPdpte].u, (uint32_t)uMaxAddr));
207	}
208	else
209	{
210	pPD = NULL;
211	BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! uFlat=%#RX64 max=%RX32\n", uFlat, (uint32_t)uMaxAddr));
212	}
213	if (pPD)
214	{
215	unsigned const iPte = (uFlat >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK;
216	unsigned const iPde = (uFlat >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK;
217	if (!pPD->a[iPde].b.u1Size)
218	{
219	if ((pPD->a[iPde].u & X86_PDE_PAE_PG_MASK) <= uMaxAddr)
220	pPTE = &((X86PTPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPD->a[iPde].u & ~(uint64_t)PAGE_OFFSET_MASK))->a[iPte];
221	else
222	BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPde=%#x: %RX64 max=%RX32\n",
223	iPde, pPD->a[iPde].u, (uint32_t)uMaxAddr));
224	}
225	else
226	{
227	/* Split 2MB page. */
228	X86PTPAE BS3_FAR *pPT;
229	uint64_t uTmpl = pPD->a[iPde].u & ~(uint64_t)(X86_PDE4M_G \| X86_PDE4M_PS \| X86_PDE4M_PAT);
230	if (!pPD->a[iPde].b.u1Global)
231	uTmpl \|= X86_PTE_G;
232	if (!pPD->a[iPde].b.u1PAT)
233	uTmpl \|= X86_PTE_PAT;
234
235	pPT = (X86PTPAE BS3_FAR *)bs3PagingBuildPaeTable(uTmpl, PAGE_SIZE,
236	uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
237	if (pPT)
238	{
239	ASMAtomicUoWriteU64(&pPD->a[iPde].u,
240	Bs3SelPtrToFlat(pPT)
241	\| ( pPD->a[iPde].u
242	& ~(uint64_t)(X86_PTE_PAE_PG_MASK \| X86_PDE4M_PS \| X86_PDE4M_G \| X86_PDE4M_D)));
243	if (fUseInvlPg)
244	ASMInvalidatePage(uFlat);
245	pPTE = &pPT->a[iPte];
246	}
247	}
248	}
249	}
250	else
251	BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! cr3=%#RX32 uMaxAddr=%#RX32\n", (uint32_t)cr3, (uint32_t)uMaxAddr));
252	return pPTE;
253	}
254
255
256	#undef Bs3PagingProtect
257	BS3_CMN_DEF(int, Bs3PagingProtect,(uint64_t uFlat, uint64_t cb, uint64_t fSet, uint64_t fClear))
258	{
259	#if ARCH_BITS == 16
260	if (!BS3_MODE_IS_V86(g_bBs3CurrentMode))
261	#endif
262	{
263	RTCCUINTXREG const cr3 = ASMGetCR3();
264	RTCCUINTXREG const cr4 = g_uBs3CpuDetected & BS3CPU_F_CPUID ? ASMGetCR4() : 0;
265	bool const fLegacyPTs = !(cr4 & X86_CR4_PAE);
266	bool const fUseInvlPg = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486
267	&& ( cb < UINT64_C(16)*PAGE_SIZE
268	\|\| (cr4 & X86_CR4_PGE));
269	unsigned cEntries;
270	int rc;
271
272	/*
273	* Adjust the range parameters.
274	*/
275	cb += uFlat & PAGE_OFFSET_MASK;
276	cb = RT_ALIGN_64(cb, PAGE_SIZE);
277	uFlat &= ~(uint64_t)PAGE_OFFSET_MASK;
278
279	fSet &= ~X86_PTE_PAE_PG_MASK;
280	fClear &= ~X86_PTE_PAE_PG_MASK;
281
282	BS3PAGING_DPRINTF1(("Bs3PagingProtect: uFlat=%RX64 cb=%RX64 fSet=%RX64 fClear=%RX64 %s %s\n", uFlat, cb, fSet, fClear,
283	fLegacyPTs ? "legacy" : "pae/amd64", fUseInvlPg ? "invlpg" : "reload-cr3"));
284	if (fLegacyPTs)
285	{
286	/*
287	* Legacy page tables.
288	*/
289	while ((uint32_t)cb > 0)
290	{
291	PX86PTE pPte = BS3_CMN_FAR_NM(bs3PagingGetLegacyPte)(cr3, (uint32_t)uFlat, fUseInvlPg, &rc);
292	if (!pPte)
293	return rc;
294
295	cEntries = X86_PG_ENTRIES - ((uFlat >> X86_PT_SHIFT) & X86_PT_MASK);
296	while (cEntries-- > 0 && cb > 0)
297	{
298	pPte->u &= ~(uint32_t)fClear;
299	pPte->u \|= (uint32_t)fSet;
300	if (fUseInvlPg)
301	ASMInvalidatePage(uFlat);
302
303	pPte++;
304	uFlat += PAGE_SIZE;
305	cb -= PAGE_SIZE;
306	}
307	}
308	}
309	else
310	{
311	/*
312	* Long mode or PAE page tables (at this level they are the same).
313	*/
314	while (cb > 0)
315	{
316	PX86PTEPAE pPte = BS3_CMN_FAR_NM(bs3PagingGetPaePte)(cr3, g_bBs3CurrentMode, uFlat, fUseInvlPg, &rc);
317	if (!pPte)
318	return rc;
319
320	cEntries = X86_PG_ENTRIES - ((uFlat >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK);
321	while (cEntries-- > 0 && cb > 0)
322	{
323	pPte->u &= ~fClear;
324	pPte->u \|= fSet;
325	if (fUseInvlPg)
326	ASMInvalidatePage(uFlat);
327
328	pPte++;
329	uFlat += PAGE_SIZE;
330	cb -= PAGE_SIZE;
331	}
332	}
333	}
334
335	/*
336	* Flush the TLB if we didn't use INVLPG above.
337	*/
338	BS3PAGING_DPRINTF2(("Bs3PagingProtect: reloading cr3=%RX32\n", (uint32_t)cr3));
339	//if (!fUseInvlPg)
340	ASMSetCR3(cr3);
341	BS3PAGING_DPRINTF2(("Bs3PagingProtect: reloaded cr3=%RX32\n", (uint32_t)cr3));
342	}
343	#if ARCH_BITS == 16
344	/*
345	* We can do this stuff in v8086 mode.
346	*/
347	else
348	return Bs3SwitchFromV86To16BitAndCallC((FPFNBS3FAR)Bs3PagingProtect_f16, sizeof(uint64_t) * 4, uFlat, cb, fSet, fClear);
349	#endif
350	return VINF_SUCCESS;
351	}
352
353
354	#undef Bs3PagingProtectPtr
355	BS3_CMN_DEF(int, Bs3PagingProtectPtr,(void *pv, size_t cb, uint64_t fSet, uint64_t fClear))
356	{
357	#if ARCH_BITS == 16
358	return BS3_CMN_NM(Bs3PagingProtect)(Bs3SelPtrToFlat(pv), cb, fSet, fClear);
359	#else
360	return BS3_CMN_NM(Bs3PagingProtect)((uintptr_t)pv, cb, fSet, fClear);
361	#endif
362	}
363
364
365	#undef Bs3PagingGetPte
366	BS3_CMN_DEF(void BS3_FAR , Bs3PagingGetPte,(uint64_t uFlat, int prc))
367	{
368	RTCCUINTXREG const cr3 = ASMGetCR3();
369	RTCCUINTXREG const cr4 = g_uBs3CpuDetected & BS3CPU_F_CPUID ? ASMGetCR4() : 0;
370	bool const fLegacyPTs = !(cr4 & X86_CR4_PAE);
371	bool const fUseInvlPg = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486;
372	int rc;
373	if (!prc)
374	prc = &rc;
375	if (!fLegacyPTs)
376	return BS3_CMN_FAR_NM(bs3PagingGetPaePte)(cr3, g_bBs3CurrentMode, uFlat, fUseInvlPg, prc);
377	if (uFlat < _4G)
378	return BS3_CMN_FAR_NM(bs3PagingGetLegacyPte)(cr3, (uint32_t)uFlat, fUseInvlPg, prc);
379	*prc = VERR_OUT_OF_RANGE;
380	return NULL;
381	}
382

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source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingProtect.c@ 82968

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