Enable Nt32 platform boot to DXE phase.
[mirror_edk2.git] / MdeModulePkg / Core / DxeIplPeim / Ia32 / DxeLoadFunc.c
CommitLineData
95276127 1/*++\r
2\r
3Copyright (c) 2006, Intel Corporation\r
4All rights reserved. This program and the accompanying materials\r
5are licensed and made available under the terms and conditions of the BSD License\r
6which accompanies this distribution. The full text of the license may be found at\r
7http://opensource.org/licenses/bsd-license.php\r
8\r
9THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
10WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
11\r
12Module Name:\r
13\r
14 DxeLoadFunc.c\r
15\r
16Abstract:\r
17\r
18 Ia32-specifc functionality for DxeLoad.\r
19\r
20--*/\r
21\r
22//\r
23// Include common header file for this module.\r
24//\r
25#include "CommonHeader.h"\r
26\r
27#include "DxeIpl.h"\r
28#include "VirtualMemory.h"\r
29\r
30//\r
31// Global Descriptor Table (GDT)\r
32//\r
33GLOBAL_REMOVE_IF_UNREFERENCED IA32_GDT gGdtEntries [] = {\r
34/* selector { Global Segment Descriptor } */ \r
35/* 0x00 */ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, //null descriptor \r
36/* 0x08 */ {{0xffff, 0, 0, 0x2, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //linear data segment descriptor\r
37/* 0x10 */ {{0xffff, 0, 0, 0xf, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //linear code segment descriptor\r
38/* 0x18 */ {{0xffff, 0, 0, 0x3, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //system data segment descriptor\r
39/* 0x20 */ {{0xffff, 0, 0, 0xa, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //system code segment descriptor\r
40/* 0x28 */ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, //spare segment descriptor\r
41/* 0x30 */ {{0xffff, 0, 0, 0x2, 1, 0, 1, 0xf, 0, 0, 1, 1, 0}}, //system data segment descriptor\r
42/* 0x38 */ {{0xffff, 0, 0, 0xa, 1, 0, 1, 0xf, 0, 1, 0, 1, 0}}, //system code segment descriptor\r
43/* 0x40 */ {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, //spare segment descriptor\r
44};\r
45\r
46//\r
47// IA32 Gdt register\r
48//\r
49GLOBAL_REMOVE_IF_UNREFERENCED CONST IA32_DESCRIPTOR gGdt = {\r
50 sizeof (gGdtEntries) - 1,\r
51 (UINTN) gGdtEntries\r
52 };\r
53\r
54VOID\r
55HandOffToDxeCore (\r
56 IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,\r
57 IN EFI_PEI_HOB_POINTERS HobList,\r
58 IN EFI_PEI_PPI_DESCRIPTOR *EndOfPeiSignal\r
59 )\r
60{\r
61 EFI_STATUS Status;\r
62 EFI_PHYSICAL_ADDRESS BaseOfStack;\r
63 EFI_PHYSICAL_ADDRESS TopOfStack;\r
64 UINTN PageTables;\r
65\r
66 Status = PeiServicesAllocatePages (EfiBootServicesData, EFI_SIZE_TO_PAGES (STACK_SIZE), &BaseOfStack);\r
67 ASSERT_EFI_ERROR (Status);\r
68 \r
69 if (FeaturePcdGet(PcdDxeIplSwitchToLongMode)) {\r
70 //\r
71 // Compute the top of the stack we were allocated, which is used to load X64 dxe core. \r
72 // Pre-allocate a 32 bytes which confroms to x64 calling convention.\r
73 //\r
74 // The first four parameters to a function are passed in rcx, rdx, r8 and r9. \r
75 // Any further parameters are pushed on the stack. Furthermore, space (4 * 8bytes) for the \r
76 // register parameters is reserved on the stack, in case the called function \r
77 // wants to spill them; this is important if the function is variadic. \r
78 //\r
79 TopOfStack = BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - 32;\r
80\r
81 //\r
82 // X64 Calling Conventions requires that the stack must be aligned to 16 bytes\r
83 //\r
84 TopOfStack = (EFI_PHYSICAL_ADDRESS) (UINTN) ALIGN_POINTER (TopOfStack, 16);\r
85\r
86 //\r
87 // Load the GDT of Go64. Since the GDT of 32-bit Tiano locates in the BS_DATA\r
88 // memory, it may be corrupted when copying FV to high-end memory \r
89 //\r
90 AsmWriteGdtr (&gGdt);\r
91 //\r
92 // Create page table and save PageMapLevel4 to CR3\r
93 //\r
94 PageTables = CreateIdentityMappingPageTables ();\r
95\r
96 //\r
97 // End of PEI phase singal\r
98 //\r
99 Status = PeiServicesInstallPpi (EndOfPeiSignal);\r
100 ASSERT_EFI_ERROR (Status);\r
101 \r
102 AsmWriteCr3 (PageTables);\r
103 //\r
104 // Go to Long Mode. Interrupts will not get turned on until the CPU AP is loaded.\r
105 // Call x64 drivers passing in single argument, a pointer to the HOBs.\r
106 // \r
107 AsmEnablePaging64 (\r
108 SYS_CODE64_SEL,\r
109 DxeCoreEntryPoint,\r
110 (EFI_PHYSICAL_ADDRESS)(UINTN)(HobList.Raw),\r
111 0,\r
112 TopOfStack\r
113 );\r
114 } else {\r
115 //\r
116 // Compute the top of the stack we were allocated. Pre-allocate a UINTN\r
117 // for safety.\r
118 //\r
119 TopOfStack = BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT;\r
120 TopOfStack = (EFI_PHYSICAL_ADDRESS) (UINTN) ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);\r
121\r
122 //\r
123 // End of PEI phase singal\r
124 //\r
125 Status = PeiServicesInstallPpi (EndOfPeiSignal);\r
126 ASSERT_EFI_ERROR (Status);\r
127\r
128 SwitchStack (\r
129 (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,\r
130 HobList.Raw,\r
131 NULL,\r
132 (VOID *) (UINTN) TopOfStack\r
133 );\r
134 } \r
135}\r
136\r