2 Set a IDT entry for debug purpose
4 Set a IDT entry for interrupt vector 3 for debug purpose for x64 platform
6 Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
8 This program and the accompanying materials
9 are licensed and made available under the terms and conditions of the BSD License
10 which accompanies this distribution. The full text of the license may be found at
11 http://opensource.org/licenses/bsd-license.php
13 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
14 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17 #include "ScriptExecute.h"
19 #define IA32_PG_P BIT0
20 #define IA32_PG_RW BIT1
21 #define IA32_PG_PS BIT7
24 VOID
*mOriginalHandler
;
25 UINTN mS3NvsPageTableAddress
;
33 PageFaultHandlerHook (
38 Hook IDT with our page fault handler so that the on-demand paging works on page fault.
40 @param IdtEntry a pointer to IDT entry
44 HookPageFaultHandler (
45 IN IA32_IDT_GATE_DESCRIPTOR
*IdtEntry
49 UINT8 PhysicalAddressBits
;
50 UINTN PageFaultHandlerHookAddress
;
52 AsmCpuid (0x80000000, &RegEax
, NULL
, NULL
, NULL
);
53 if (RegEax
>= 0x80000008) {
54 AsmCpuid (0x80000008, &RegEax
, NULL
, NULL
, NULL
);
55 PhysicalAddressBits
= (UINT8
) RegEax
;
57 PhysicalAddressBits
= 36;
59 mPhyMask
= LShiftU64 (1, PhysicalAddressBits
) - 1;
60 mPhyMask
&= (1ull << 48) - SIZE_4KB
;
63 // Set Page Fault entry to catch >4G access
65 PageFaultHandlerHookAddress
= (UINTN
)PageFaultHandlerHook
;
66 mOriginalHandler
= (VOID
*)(UINTN
)(LShiftU64 (IdtEntry
->Bits
.OffsetUpper
, 32) + IdtEntry
->Bits
.OffsetLow
+ (IdtEntry
->Bits
.OffsetHigh
<< 16));
67 IdtEntry
->Bits
.OffsetLow
= (UINT16
)PageFaultHandlerHookAddress
;
68 IdtEntry
->Bits
.Selector
= (UINT16
)AsmReadCs ();
69 IdtEntry
->Bits
.Reserved_0
= 0;
70 IdtEntry
->Bits
.GateType
= IA32_IDT_GATE_TYPE_INTERRUPT_32
;
71 IdtEntry
->Bits
.OffsetHigh
= (UINT16
)(PageFaultHandlerHookAddress
>> 16);
72 IdtEntry
->Bits
.OffsetUpper
= (UINT32
)(PageFaultHandlerHookAddress
>> 32);
73 IdtEntry
->Bits
.Reserved_1
= 0;
76 mS3NvsPageTableAddress
= (UINTN
)(AsmReadCr3 () & mPhyMask
) + EFI_PAGES_TO_SIZE(2);
78 mS3NvsPageTableAddress
= (UINTN
)(AsmReadCr3 () & mPhyMask
) + EFI_PAGES_TO_SIZE(6);
83 Set a IDT entry for interrupt vector 3 for debug purpose.
85 @param AcpiS3Context a pointer to a structure of ACPI_S3_CONTEXT
90 IN ACPI_S3_CONTEXT
*AcpiS3Context
93 IA32_IDT_GATE_DESCRIPTOR
*IdtEntry
;
94 IA32_DESCRIPTOR
*IdtDescriptor
;
99 // Restore IDT for debug
101 IdtDescriptor
= (IA32_DESCRIPTOR
*) (UINTN
) (AcpiS3Context
->IdtrProfile
);
102 AsmWriteIdtr (IdtDescriptor
);
105 // Setup the default CPU exception handlers
107 Status
= InitializeCpuExceptionHandlers (NULL
);
108 ASSERT_EFI_ERROR (Status
);
112 // Update IDT entry INT3 if the instruction is valid in it
114 S3DebugBuffer
= (UINTN
) (AcpiS3Context
->S3DebugBufferAddress
);
115 if (*(UINTN
*)S3DebugBuffer
!= (UINTN
) -1) {
116 IdtEntry
= (IA32_IDT_GATE_DESCRIPTOR
*)(IdtDescriptor
->Base
+ (3 * sizeof (IA32_IDT_GATE_DESCRIPTOR
)));
117 IdtEntry
->Bits
.OffsetLow
= (UINT16
)S3DebugBuffer
;
118 IdtEntry
->Bits
.Selector
= (UINT16
)AsmReadCs ();
119 IdtEntry
->Bits
.Reserved_0
= 0;
120 IdtEntry
->Bits
.GateType
= IA32_IDT_GATE_TYPE_INTERRUPT_32
;
121 IdtEntry
->Bits
.OffsetHigh
= (UINT16
)(S3DebugBuffer
>> 16);
122 IdtEntry
->Bits
.OffsetUpper
= (UINT32
)(S3DebugBuffer
>> 32);
123 IdtEntry
->Bits
.Reserved_1
= 0;
127 IdtEntry
= (IA32_IDT_GATE_DESCRIPTOR
*)(IdtDescriptor
->Base
+ (14 * sizeof (IA32_IDT_GATE_DESCRIPTOR
)));
128 HookPageFaultHandler (IdtEntry
);
132 Get new page address.
134 @param PageNum new page number needed
136 @return new page address
144 NewPage
= mS3NvsPageTableAddress
;
145 ZeroMem ((VOID
*)NewPage
, EFI_PAGES_TO_SIZE(PageNum
));
146 mS3NvsPageTableAddress
+= EFI_PAGES_TO_SIZE(PageNum
);
151 The page fault handler that on-demand read >4G memory/MMIO.
153 @retval TRUE The page fault is correctly handled.
154 @retval FALSE The page fault is not handled and is passed through to original handler.
167 PFAddress
= AsmReadCr2 ();
168 DEBUG ((EFI_D_ERROR
, "BootScript - PageFaultHandler: Cr2 - %lx\n", PFAddress
));
170 if (PFAddress
>= mPhyMask
+ SIZE_4KB
) {
173 PFAddress
&= mPhyMask
;
175 PageTable
= (UINT64
*)(UINTN
)(AsmReadCr3 () & mPhyMask
);
177 PTIndex
= BitFieldRead64 (PFAddress
, 39, 47);
179 if ((PageTable
[PTIndex
] & IA32_PG_P
) == 0) {
180 PageTable
[PTIndex
] = GetNewPage (1) | IA32_PG_P
| IA32_PG_RW
;
182 PageTable
= (UINT64
*)(UINTN
)(PageTable
[PTIndex
] & mPhyMask
);
183 PTIndex
= BitFieldRead64 (PFAddress
, 30, 38);
185 if (mPage1GSupport
) {
186 PageTable
[PTIndex
] = PFAddress
| IA32_PG_P
| IA32_PG_RW
| IA32_PG_PS
;
188 if ((PageTable
[PTIndex
] & IA32_PG_P
) == 0) {
189 PageTable
[PTIndex
] = GetNewPage (1) | IA32_PG_P
| IA32_PG_RW
;
191 PageTable
= (UINT64
*)(UINTN
)(PageTable
[PTIndex
] & mPhyMask
);
192 PTIndex
= BitFieldRead64 (PFAddress
, 21, 29);
194 PageTable
[PTIndex
] = PFAddress
| IA32_PG_P
| IA32_PG_RW
| IA32_PG_PS
;