3 Copyright (c) 2006, Intel Corporation
4 All rights reserved. This program and the accompanying materials
5 are licensed and made available under the terms and conditions of the BSD License
6 which accompanies this distribution. The full text of the license may be found at
7 http://opensource.org/licenses/bsd-license.php
9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
18 Ia32-specifc functionality for DxeLoad.
23 #include "VirtualMemory.h"
26 // Global Descriptor Table (GDT)
28 GLOBAL_REMOVE_IF_UNREFERENCED IA32_GDT gGdtEntries
[] = {
29 /* selector { Global Segment Descriptor } */
30 /* 0x00 */ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, //null descriptor
31 /* 0x08 */ {{0xffff, 0, 0, 0x2, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //linear data segment descriptor
32 /* 0x10 */ {{0xffff, 0, 0, 0xf, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //linear code segment descriptor
33 /* 0x18 */ {{0xffff, 0, 0, 0x3, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //system data segment descriptor
34 /* 0x20 */ {{0xffff, 0, 0, 0xa, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //system code segment descriptor
35 /* 0x28 */ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, //spare segment descriptor
36 /* 0x30 */ {{0xffff, 0, 0, 0x2, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //system data segment descriptor
37 /* 0x38 */ {{0xffff, 0, 0, 0xa, 1, 0, 1, 0xf, 0, 1, 0, 1, 0}}, //system code segment descriptor
38 /* 0x40 */ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, //spare segment descriptor
44 GLOBAL_REMOVE_IF_UNREFERENCED CONST IA32_DESCRIPTOR gGdt
= {
45 sizeof (gGdtEntries
) - 1,
49 GLOBAL_REMOVE_IF_UNREFERENCED IA32_DESCRIPTOR gLidtDescriptor
= {
50 sizeof (X64_IDT_GATE_DESCRIPTOR
) * 32 - 1,
56 IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint
,
57 IN EFI_PEI_HOB_POINTERS HobList
,
58 IN EFI_PEI_PPI_DESCRIPTOR
*EndOfPeiSignal
62 EFI_PHYSICAL_ADDRESS BaseOfStack
;
63 EFI_PHYSICAL_ADDRESS TopOfStack
;
65 X64_IDT_GATE_DESCRIPTOR
*IdtTable
;
68 EFI_PHYSICAL_ADDRESS VectorAddress
;
71 Status
= PeiServicesAllocatePages (EfiBootServicesData
, EFI_SIZE_TO_PAGES (STACK_SIZE
), &BaseOfStack
);
72 ASSERT_EFI_ERROR (Status
);
74 if (FeaturePcdGet(PcdDxeIplSwitchToLongMode
)) {
76 // Compute the top of the stack we were allocated, which is used to load X64 dxe core.
77 // Pre-allocate a 32 bytes which confroms to x64 calling convention.
79 // The first four parameters to a function are passed in rcx, rdx, r8 and r9.
80 // Any further parameters are pushed on the stack. Furthermore, space (4 * 8bytes) for the
81 // register parameters is reserved on the stack, in case the called function
82 // wants to spill them; this is important if the function is variadic.
84 TopOfStack
= BaseOfStack
+ EFI_SIZE_TO_PAGES (STACK_SIZE
) * EFI_PAGE_SIZE
- 32;
87 // X64 Calling Conventions requires that the stack must be aligned to 16 bytes
89 TopOfStack
= (EFI_PHYSICAL_ADDRESS
) (UINTN
) ALIGN_POINTER (TopOfStack
, 16);
92 // Load the GDT of Go64. Since the GDT of 32-bit Tiano locates in the BS_DATA
93 // memory, it may be corrupted when copying FV to high-end memory
97 // Create page table and save PageMapLevel4 to CR3
99 PageTables
= CreateIdentityMappingPageTables ();
102 // End of PEI phase singal
104 Status
= PeiServicesInstallPpi (EndOfPeiSignal
);
105 ASSERT_EFI_ERROR (Status
);
107 AsmWriteCr3 (PageTables
);
110 if (FeaturePcdGet (PcdDxeIplEnableIdt
)) {
111 SizeOfTemplate
= AsmGetVectorTemplatInfo (&TemplateBase
);
113 Status
= PeiServicesAllocatePages (
115 EFI_SIZE_TO_PAGES((SizeOfTemplate
+ sizeof (X64_IDT_GATE_DESCRIPTOR
)) * 32),
119 ASSERT_EFI_ERROR (Status
);
121 IdtTable
= (X64_IDT_GATE_DESCRIPTOR
*) (UINTN
) (VectorAddress
+ SizeOfTemplate
* 32);
122 for (Index
= 0; Index
< 32; Index
++) {
123 IdtTable
[Index
].Ia32IdtEntry
.Bits
.GateType
= 0x8e;
124 IdtTable
[Index
].Ia32IdtEntry
.Bits
.Reserved_0
= 0;
125 IdtTable
[Index
].Ia32IdtEntry
.Bits
.Selector
= SYS_CODE64_SEL
;
127 IdtTable
[Index
].Ia32IdtEntry
.Bits
.OffsetLow
= (UINT16
) VectorAddress
;
128 IdtTable
[Index
].Ia32IdtEntry
.Bits
.OffsetHigh
= (UINT16
) (RShiftU64 (VectorAddress
, 16));
129 IdtTable
[Index
].Offset32To63
= (UINT32
) (RShiftU64 (VectorAddress
, 32));
130 IdtTable
[Index
].Reserved
= 0;
132 CopyMem ((VOID
*) (UINTN
) VectorAddress
, TemplateBase
, SizeOfTemplate
);
133 AsmVectorFixup ((VOID
*) (UINTN
) VectorAddress
, (UINT8
) Index
);
135 VectorAddress
+= SizeOfTemplate
;
138 gLidtDescriptor
.Base
= (UINTN
) IdtTable
;
139 AsmWriteIdtr (&gLidtDescriptor
);
142 // Go to Long Mode. Interrupts will not get turned on until the CPU AP is loaded.
143 // Call x64 drivers passing in single argument, a pointer to the HOBs.
148 (EFI_PHYSICAL_ADDRESS
)(UINTN
)(HobList
.Raw
),
154 // Compute the top of the stack we were allocated. Pre-allocate a UINTN
157 TopOfStack
= BaseOfStack
+ EFI_SIZE_TO_PAGES (STACK_SIZE
) * EFI_PAGE_SIZE
- CPU_STACK_ALIGNMENT
;
158 TopOfStack
= (EFI_PHYSICAL_ADDRESS
) (UINTN
) ALIGN_POINTER (TopOfStack
, CPU_STACK_ALIGNMENT
);
161 // End of PEI phase singal
163 Status
= PeiServicesInstallPpi (EndOfPeiSignal
);
164 ASSERT_EFI_ERROR (Status
);
167 (SWITCH_STACK_ENTRY_POINT
)(UINTN
)DxeCoreEntryPoint
,
170 (VOID
*) (UINTN
) TopOfStack