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Commit | Line | Data |
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be46cd5f | 1 | /** @file\r |
2 | Set a IDT entry for debug purpose\r | |
3 | \r | |
4 | Set a IDT entry for interrupt vector 3 for debug purpose for x64 platform\r | |
5 | \r | |
306a5836 | 6 | Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r |
ab1a5a58 LD |
7 | Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r |
8 | \r | |
be46cd5f | 9 | \r |
9d510e61 | 10 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
be46cd5f | 11 | \r |
12 | **/\r | |
13 | #include "ScriptExecute.h"\r | |
d0bf5623 | 14 | \r |
c6368abc SZ |
15 | //\r |
16 | // 8 extra pages for PF handler.\r | |
17 | //\r | |
18 | #define EXTRA_PAGE_TABLE_PAGES 8\r | |
19 | \r | |
d0bf5623 JY |
20 | #define IA32_PG_P BIT0\r |
21 | #define IA32_PG_RW BIT1\r | |
22 | #define IA32_PG_PS BIT7\r | |
23 | \r | |
c6368abc SZ |
24 | UINT64 mPhyMask;\r |
25 | VOID *mOriginalHandler;\r | |
26 | UINTN mPageFaultBuffer;\r | |
27 | UINTN mPageFaultIndex = 0;\r | |
28 | //\r | |
29 | // Store the uplink information for each page being used.\r | |
30 | //\r | |
31 | UINT64 *mPageFaultUplink[EXTRA_PAGE_TABLE_PAGES];\r | |
d0bf5623 | 32 | \r |
54e27ada JY |
33 | /**\r |
34 | Page fault handler.\r | |
35 | \r | |
36 | **/\r | |
d0bf5623 JY |
37 | VOID\r |
38 | EFIAPI\r | |
39 | PageFaultHandlerHook (\r | |
40 | VOID\r | |
41 | );\r | |
42 | \r | |
54e27ada JY |
43 | /**\r |
44 | Hook IDT with our page fault handler so that the on-demand paging works on page fault.\r | |
45 | \r | |
46 | @param IdtEntry a pointer to IDT entry\r | |
47 | \r | |
48 | **/\r | |
d0bf5623 JY |
49 | VOID\r |
50 | HookPageFaultHandler (\r | |
68cc1ba3 | 51 | IN IA32_IDT_GATE_DESCRIPTOR *IdtEntry\r |
d0bf5623 JY |
52 | )\r |
53 | {\r | |
54 | UINT32 RegEax;\r | |
59cc677c | 55 | UINT8 PhysicalAddressBits;\r |
73f0127f | 56 | UINTN PageFaultHandlerHookAddress;\r |
d0bf5623 | 57 | \r |
59cc677c SZ |
58 | AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r |
59 | if (RegEax >= 0x80000008) {\r | |
60 | AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);\r | |
61 | PhysicalAddressBits = (UINT8) RegEax;\r | |
62 | } else {\r | |
63 | PhysicalAddressBits = 36;\r | |
d0bf5623 | 64 | }\r |
59cc677c SZ |
65 | mPhyMask = LShiftU64 (1, PhysicalAddressBits) - 1;\r |
66 | mPhyMask &= (1ull << 48) - SIZE_4KB;\r | |
d0bf5623 JY |
67 | \r |
68 | //\r | |
69 | // Set Page Fault entry to catch >4G access\r | |
70 | //\r | |
73f0127f | 71 | PageFaultHandlerHookAddress = (UINTN)PageFaultHandlerHook;\r |
68cc1ba3 | 72 | mOriginalHandler = (VOID *)(UINTN)(LShiftU64 (IdtEntry->Bits.OffsetUpper, 32) + IdtEntry->Bits.OffsetLow + (IdtEntry->Bits.OffsetHigh << 16));\r |
73f0127f | 73 | IdtEntry->Bits.OffsetLow = (UINT16)PageFaultHandlerHookAddress;\r |
68cc1ba3 SZ |
74 | IdtEntry->Bits.Selector = (UINT16)AsmReadCs ();\r |
75 | IdtEntry->Bits.Reserved_0 = 0;\r | |
76 | IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;\r | |
73f0127f SZ |
77 | IdtEntry->Bits.OffsetHigh = (UINT16)(PageFaultHandlerHookAddress >> 16);\r |
78 | IdtEntry->Bits.OffsetUpper = (UINT32)(PageFaultHandlerHookAddress >> 32);\r | |
68cc1ba3 | 79 | IdtEntry->Bits.Reserved_1 = 0;\r |
d0bf5623 JY |
80 | \r |
81 | if (mPage1GSupport) {\r | |
c6368abc | 82 | mPageFaultBuffer = (UINTN)(AsmReadCr3 () & mPhyMask) + EFI_PAGES_TO_SIZE(2);\r |
d0bf5623 | 83 | }else {\r |
c6368abc SZ |
84 | mPageFaultBuffer = (UINTN)(AsmReadCr3 () & mPhyMask) + EFI_PAGES_TO_SIZE(6);\r |
85 | }\r | |
86 | ZeroMem (mPageFaultUplink, sizeof (mPageFaultUplink));\r | |
87 | }\r | |
88 | \r | |
89 | /**\r | |
90 | The function will check if current waking vector is long mode.\r | |
91 | \r | |
92 | @param AcpiS3Context a pointer to a structure of ACPI_S3_CONTEXT\r | |
93 | \r | |
94 | @retval TRUE Current context need long mode waking vector.\r | |
95 | @retval FALSE Current context need not long mode waking vector.\r | |
96 | **/\r | |
97 | BOOLEAN\r | |
98 | IsLongModeWakingVector (\r | |
99 | IN ACPI_S3_CONTEXT *AcpiS3Context\r | |
100 | )\r | |
101 | {\r | |
102 | EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;\r | |
103 | \r | |
104 | Facs = (EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *) ((UINTN) (AcpiS3Context->AcpiFacsTable));\r | |
105 | if ((Facs == NULL) ||\r | |
106 | (Facs->Signature != EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE) ||\r | |
107 | ((Facs->FirmwareWakingVector == 0) && (Facs->XFirmwareWakingVector == 0)) ) {\r | |
108 | // Something wrong with FACS\r | |
109 | return FALSE;\r | |
110 | }\r | |
111 | if (Facs->XFirmwareWakingVector != 0) {\r | |
112 | if ((Facs->Version == EFI_ACPI_4_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_VERSION) &&\r | |
113 | ((Facs->Flags & EFI_ACPI_4_0_64BIT_WAKE_SUPPORTED_F) != 0) &&\r | |
306a5836 | 114 | ((Facs->OspmFlags & EFI_ACPI_4_0_OSPM_64BIT_WAKE__F) != 0)) {\r |
c6368abc SZ |
115 | // Both BIOS and OS wants 64bit vector\r |
116 | if (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {\r | |
117 | return TRUE;\r | |
118 | }\r | |
119 | }\r | |
d0bf5623 | 120 | }\r |
c6368abc | 121 | return FALSE;\r |
d0bf5623 JY |
122 | }\r |
123 | \r | |
be46cd5f | 124 | /**\r |
125 | Set a IDT entry for interrupt vector 3 for debug purpose.\r | |
126 | \r | |
127 | @param AcpiS3Context a pointer to a structure of ACPI_S3_CONTEXT\r | |
128 | \r | |
129 | **/\r | |
130 | VOID\r | |
131 | SetIdtEntry (\r | |
132 | IN ACPI_S3_CONTEXT *AcpiS3Context\r | |
133 | )\r | |
134 | {\r | |
68cc1ba3 | 135 | IA32_IDT_GATE_DESCRIPTOR *IdtEntry;\r |
be46cd5f | 136 | IA32_DESCRIPTOR *IdtDescriptor;\r |
137 | UINTN S3DebugBuffer;\r | |
57f360f2 | 138 | EFI_STATUS Status;\r |
be46cd5f | 139 | \r |
140 | //\r | |
141 | // Restore IDT for debug\r | |
142 | //\r | |
143 | IdtDescriptor = (IA32_DESCRIPTOR *) (UINTN) (AcpiS3Context->IdtrProfile);\r | |
1e172d6b | 144 | AsmWriteIdtr (IdtDescriptor);\r |
145 | \r | |
146 | //\r | |
147 | // Setup the default CPU exception handlers\r | |
148 | //\r | |
57f360f2 JF |
149 | Status = InitializeCpuExceptionHandlers (NULL);\r |
150 | ASSERT_EFI_ERROR (Status);\r | |
1e172d6b | 151 | \r |
f4a25e81 | 152 | DEBUG_CODE (\r |
153 | //\r | |
154 | // Update IDT entry INT3 if the instruction is valid in it\r | |
155 | //\r | |
156 | S3DebugBuffer = (UINTN) (AcpiS3Context->S3DebugBufferAddress);\r | |
157 | if (*(UINTN *)S3DebugBuffer != (UINTN) -1) {\r | |
68cc1ba3 SZ |
158 | IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (3 * sizeof (IA32_IDT_GATE_DESCRIPTOR)));\r |
159 | IdtEntry->Bits.OffsetLow = (UINT16)S3DebugBuffer;\r | |
160 | IdtEntry->Bits.Selector = (UINT16)AsmReadCs ();\r | |
161 | IdtEntry->Bits.Reserved_0 = 0;\r | |
162 | IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;\r | |
163 | IdtEntry->Bits.OffsetHigh = (UINT16)(S3DebugBuffer >> 16);\r | |
164 | IdtEntry->Bits.OffsetUpper = (UINT32)(S3DebugBuffer >> 32);\r | |
165 | IdtEntry->Bits.Reserved_1 = 0;\r | |
f4a25e81 | 166 | }\r |
167 | );\r | |
be46cd5f | 168 | \r |
c6368abc SZ |
169 | //\r |
170 | // If both BIOS and OS wants long mode waking vector,\r | |
171 | // S3ResumePei should have established 1:1 Virtual to Physical identity mapping page table,\r | |
172 | // no need to hook page fault handler.\r | |
173 | //\r | |
174 | if (!IsLongModeWakingVector (AcpiS3Context)) {\r | |
175 | IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *)(IdtDescriptor->Base + (14 * sizeof (IA32_IDT_GATE_DESCRIPTOR)));\r | |
176 | HookPageFaultHandler (IdtEntry);\r | |
177 | }\r | |
d0bf5623 JY |
178 | }\r |
179 | \r | |
54e27ada | 180 | /**\r |
c6368abc | 181 | Acquire page for page fault.\r |
54e27ada | 182 | \r |
c6368abc | 183 | @param[in, out] Uplink Pointer to up page table entry.\r |
54e27ada | 184 | \r |
54e27ada | 185 | **/\r |
c6368abc SZ |
186 | VOID\r |
187 | AcquirePage (\r | |
188 | IN OUT UINT64 *Uplink\r | |
d0bf5623 JY |
189 | )\r |
190 | {\r | |
c6368abc SZ |
191 | UINTN Address;\r |
192 | \r | |
193 | Address = mPageFaultBuffer + EFI_PAGES_TO_SIZE (mPageFaultIndex);\r | |
194 | ZeroMem ((VOID *) Address, EFI_PAGES_TO_SIZE (1));\r | |
195 | \r | |
196 | //\r | |
197 | // Cut the previous uplink if it exists and wasn't overwritten.\r | |
198 | //\r | |
ab1a5a58 LD |
199 | if ((mPageFaultUplink[mPageFaultIndex] != NULL) &&\r |
200 | ((*mPageFaultUplink[mPageFaultIndex] & ~mAddressEncMask & mPhyMask) == Address)) {\r | |
c6368abc SZ |
201 | *mPageFaultUplink[mPageFaultIndex] = 0;\r |
202 | }\r | |
203 | \r | |
204 | //\r | |
205 | // Link & Record the current uplink.\r | |
206 | //\r | |
ab1a5a58 | 207 | *Uplink = Address | mAddressEncMask | IA32_PG_P | IA32_PG_RW;\r |
c6368abc SZ |
208 | mPageFaultUplink[mPageFaultIndex] = Uplink;\r |
209 | \r | |
210 | mPageFaultIndex = (mPageFaultIndex + 1) % EXTRA_PAGE_TABLE_PAGES;\r | |
be46cd5f | 211 | }\r |
212 | \r | |
54e27ada JY |
213 | /**\r |
214 | The page fault handler that on-demand read >4G memory/MMIO.\r | |
d1102dba | 215 | \r |
54e27ada JY |
216 | @retval TRUE The page fault is correctly handled.\r |
217 | @retval FALSE The page fault is not handled and is passed through to original handler.\r | |
218 | \r | |
219 | **/\r | |
d0bf5623 JY |
220 | BOOLEAN\r |
221 | EFIAPI\r | |
222 | PageFaultHandler (\r | |
223 | VOID\r | |
224 | )\r | |
225 | {\r | |
226 | UINT64 *PageTable;\r | |
227 | UINT64 PFAddress;\r | |
228 | UINTN PTIndex;\r | |
229 | \r | |
230 | PFAddress = AsmReadCr2 ();\r | |
558f58e3 | 231 | DEBUG ((DEBUG_INFO, "BootScript - PageFaultHandler: Cr2 - %lx\n", PFAddress));\r |
d0bf5623 JY |
232 | \r |
233 | if (PFAddress >= mPhyMask + SIZE_4KB) {\r | |
234 | return FALSE;\r | |
235 | }\r | |
236 | PFAddress &= mPhyMask;\r | |
237 | \r | |
238 | PageTable = (UINT64*)(UINTN)(AsmReadCr3 () & mPhyMask);\r | |
239 | \r | |
240 | PTIndex = BitFieldRead64 (PFAddress, 39, 47);\r | |
241 | // PML4E\r | |
242 | if ((PageTable[PTIndex] & IA32_PG_P) == 0) {\r | |
c6368abc | 243 | AcquirePage (&PageTable[PTIndex]);\r |
d0bf5623 | 244 | }\r |
ab1a5a58 | 245 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & ~mAddressEncMask & mPhyMask);\r |
d0bf5623 JY |
246 | PTIndex = BitFieldRead64 (PFAddress, 30, 38);\r |
247 | // PDPTE\r | |
248 | if (mPage1GSupport) {\r | |
ab1a5a58 | 249 | PageTable[PTIndex] = ((PFAddress | mAddressEncMask) & ~((1ull << 30) - 1)) | IA32_PG_P | IA32_PG_RW | IA32_PG_PS;\r |
d0bf5623 JY |
250 | } else {\r |
251 | if ((PageTable[PTIndex] & IA32_PG_P) == 0) {\r | |
c6368abc | 252 | AcquirePage (&PageTable[PTIndex]);\r |
d0bf5623 | 253 | }\r |
ab1a5a58 | 254 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & ~mAddressEncMask & mPhyMask);\r |
d0bf5623 JY |
255 | PTIndex = BitFieldRead64 (PFAddress, 21, 29);\r |
256 | // PD\r | |
ab1a5a58 | 257 | PageTable[PTIndex] = ((PFAddress | mAddressEncMask) & ~((1ull << 21) - 1)) | IA32_PG_P | IA32_PG_RW | IA32_PG_PS;\r |
d0bf5623 JY |
258 | }\r |
259 | \r | |
260 | return TRUE;\r | |
261 | }\r |