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a47463f2 | 1 | /** @file\r |
2 | C based implemention of IA32 interrupt handling only\r | |
3 | requiring a minimal assembly interrupt entry point.\r | |
4 | \r | |
430fbbe0 | 5 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r |
01a1c0fc | 6 | This program and the accompanying materials\r |
a47463f2 | 7 | are licensed and made available under the terms and conditions of the BSD License\r |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include "CpuDxe.h"\r | |
17 | \r | |
18 | \r | |
19 | //\r | |
20 | // Local structure definitions\r | |
21 | //\r | |
22 | \r | |
23 | #pragma pack (1)\r | |
24 | \r | |
25 | //\r | |
26 | // Global Descriptor Entry structures\r | |
27 | //\r | |
28 | \r | |
430fbbe0 | 29 | typedef struct _GDT_ENTRY {\r |
30 | UINT16 Limit15_0;\r | |
31 | UINT16 Base15_0;\r | |
32 | UINT8 Base23_16;\r | |
33 | UINT8 Type;\r | |
34 | UINT8 Limit19_16_and_flags;\r | |
35 | UINT8 Base31_24;\r | |
a47463f2 | 36 | } GDT_ENTRY;\r |
37 | \r | |
38 | typedef\r | |
39 | struct _GDT_ENTRIES {\r | |
40 | GDT_ENTRY Null;\r | |
41 | GDT_ENTRY Linear;\r | |
42 | GDT_ENTRY LinearCode;\r | |
43 | GDT_ENTRY SysData;\r | |
44 | GDT_ENTRY SysCode;\r | |
45 | GDT_ENTRY LinearCode64;\r | |
46 | GDT_ENTRY Spare4;\r | |
47 | GDT_ENTRY Spare5;\r | |
48 | } GDT_ENTRIES;\r | |
49 | \r | |
50 | #define NULL_SEL OFFSET_OF (GDT_ENTRIES, Null)\r | |
51 | #define LINEAR_SEL OFFSET_OF (GDT_ENTRIES, Linear)\r | |
52 | #define LINEAR_CODE_SEL OFFSET_OF (GDT_ENTRIES, LinearCode)\r | |
53 | #define SYS_DATA_SEL OFFSET_OF (GDT_ENTRIES, SysData)\r | |
54 | #define SYS_CODE_SEL OFFSET_OF (GDT_ENTRIES, SysCode)\r | |
55 | #define LINEAR_CODE64_SEL OFFSET_OF (GDT_ENTRIES, LinearCode64)\r | |
56 | #define SPARE4_SEL OFFSET_OF (GDT_ENTRIES, Spare4)\r | |
57 | #define SPARE5_SEL OFFSET_OF (GDT_ENTRIES, Spare5)\r | |
58 | \r | |
59 | #if defined (MDE_CPU_IA32)\r | |
60 | #define CPU_CODE_SEL LINEAR_CODE_SEL\r | |
61 | #define CPU_DATA_SEL LINEAR_SEL\r | |
62 | #elif defined (MDE_CPU_X64)\r | |
63 | #define CPU_CODE_SEL LINEAR_CODE64_SEL\r | |
64 | #define CPU_DATA_SEL LINEAR_SEL\r | |
65 | #else\r | |
66 | #error CPU type not supported for CPU GDT initialization!\r | |
67 | #endif\r | |
68 | \r | |
69 | //\r | |
70 | // Global descriptor table (GDT) Template\r | |
71 | //\r | |
72 | STATIC GDT_ENTRIES GdtTemplate = {\r | |
73 | //\r | |
74 | // NULL_SEL\r | |
75 | //\r | |
76 | {\r | |
77 | 0x0, // limit 15:0\r | |
78 | 0x0, // base 15:0\r | |
79 | 0x0, // base 23:16\r | |
80 | 0x0, // type\r | |
81 | 0x0, // limit 19:16, flags\r | |
82 | 0x0, // base 31:24\r | |
83 | },\r | |
84 | //\r | |
85 | // LINEAR_SEL\r | |
86 | //\r | |
87 | {\r | |
88 | 0x0FFFF, // limit 0xFFFFF\r | |
89 | 0x0, // base 0\r | |
90 | 0x0,\r | |
91 | 0x092, // present, ring 0, data, expand-up, writable\r | |
92 | 0x0CF, // page-granular, 32-bit\r | |
93 | 0x0,\r | |
94 | },\r | |
95 | //\r | |
96 | // LINEAR_CODE_SEL\r | |
97 | //\r | |
98 | {\r | |
99 | 0x0FFFF, // limit 0xFFFFF\r | |
100 | 0x0, // base 0\r | |
101 | 0x0,\r | |
102 | 0x09A, // present, ring 0, data, expand-up, writable\r | |
103 | 0x0CF, // page-granular, 32-bit\r | |
104 | 0x0,\r | |
105 | },\r | |
106 | //\r | |
107 | // SYS_DATA_SEL\r | |
108 | //\r | |
109 | {\r | |
110 | 0x0FFFF, // limit 0xFFFFF\r | |
111 | 0x0, // base 0\r | |
112 | 0x0,\r | |
113 | 0x092, // present, ring 0, data, expand-up, writable\r | |
114 | 0x0CF, // page-granular, 32-bit\r | |
115 | 0x0,\r | |
116 | },\r | |
117 | //\r | |
118 | // SYS_CODE_SEL\r | |
119 | //\r | |
120 | {\r | |
121 | 0x0FFFF, // limit 0xFFFFF\r | |
122 | 0x0, // base 0\r | |
123 | 0x0,\r | |
124 | 0x09A, // present, ring 0, data, expand-up, writable\r | |
125 | 0x0CF, // page-granular, 32-bit\r | |
126 | 0x0,\r | |
127 | },\r | |
128 | //\r | |
129 | // LINEAR_CODE64_SEL\r | |
130 | //\r | |
131 | {\r | |
132 | 0x0FFFF, // limit 0xFFFFF\r | |
133 | 0x0, // base 0\r | |
134 | 0x0,\r | |
135 | 0x09B, // present, ring 0, code, expand-up, writable\r | |
136 | 0x0AF, // LimitHigh (CS.L=1, CS.D=0)\r | |
137 | 0x0, // base (high)\r | |
138 | },\r | |
139 | //\r | |
140 | // SPARE4_SEL\r | |
141 | //\r | |
142 | {\r | |
143 | 0x0, // limit 0\r | |
144 | 0x0, // base 0\r | |
145 | 0x0,\r | |
146 | 0x0, // present, ring 0, data, expand-up, writable\r | |
147 | 0x0, // page-granular, 32-bit\r | |
148 | 0x0,\r | |
149 | },\r | |
150 | //\r | |
151 | // SPARE5_SEL\r | |
152 | //\r | |
153 | {\r | |
154 | 0x0, // limit 0\r | |
155 | 0x0, // base 0\r | |
156 | 0x0,\r | |
157 | 0x0, // present, ring 0, data, expand-up, writable\r | |
158 | 0x0, // page-granular, 32-bit\r | |
159 | 0x0,\r | |
160 | },\r | |
161 | };\r | |
162 | \r | |
163 | /**\r | |
430fbbe0 | 164 | Initialize Global Descriptor Table.\r |
a47463f2 | 165 | \r |
166 | **/\r | |
167 | VOID\r | |
168 | InitGlobalDescriptorTable (\r | |
430fbbe0 | 169 | VOID\r |
a47463f2 | 170 | )\r |
171 | {\r | |
172 | GDT_ENTRIES *gdt;\r | |
173 | IA32_DESCRIPTOR gdtPtr;\r | |
174 | \r | |
175 | //\r | |
176 | // Allocate Runtime Data for the GDT\r | |
177 | //\r | |
178 | gdt = AllocateRuntimePool (sizeof (GdtTemplate) + 8);\r | |
179 | ASSERT (gdt != NULL);\r | |
180 | gdt = ALIGN_POINTER (gdt, 8);\r | |
181 | \r | |
182 | //\r | |
183 | // Initialize all GDT entries\r | |
184 | //\r | |
185 | CopyMem (gdt, &GdtTemplate, sizeof (GdtTemplate));\r | |
186 | \r | |
187 | //\r | |
188 | // Write GDT register\r | |
189 | //\r | |
190 | gdtPtr.Base = (UINT32)(UINTN)(VOID*) gdt;\r | |
5b7e61a0 | 191 | gdtPtr.Limit = (UINT16) (sizeof (GdtTemplate) - 1);\r |
a47463f2 | 192 | AsmWriteGdtr (&gdtPtr);\r |
193 | \r | |
194 | //\r | |
195 | // Update selector (segment) registers base on new GDT\r | |
196 | //\r | |
197 | SetCodeSelector ((UINT16)CPU_CODE_SEL);\r | |
198 | SetDataSelectors ((UINT16)CPU_DATA_SEL);\r | |
199 | }\r | |
200 | \r |