projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3cbfba02 DW |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r | |
| 9dc8036d | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 3cbfba02 DW |
5 | ;\r |
| 6 | ; Module Name:\r | |
| 7 | ;\r | |
| 8 | ; SecEntry.asm\r | |
| 9 | ;\r | |
| 10 | ; Abstract:\r | |
| 11 | ;\r | |
| 12 | ; This is the code that goes from real-mode to protected mode.\r | |
| 13 | ; It consumes the reset vector, calls two basic APIs from FSP binary.\r | |
| 14 | ;\r | |
| 15 | ;------------------------------------------------------------------------------\r | |
| 16 | INCLUDE Fsp.inc\r | |
| 17 | \r | |
| 18 | .686p\r | |
| 19 | .xmm\r | |
| 20 | .model small, c\r | |
| 21 | \r | |
| 22 | EXTRN CallPeiCoreEntryPoint:NEAR\r | |
| 23 | EXTRN TempRamInitParams:FAR\r | |
| 24 | \r | |
| 25 | ; Pcds\r | |
| 26 | EXTRN PcdGet32 (PcdFlashFvFspBase):DWORD\r | |
| 27 | EXTRN PcdGet32 (PcdFlashFvFspSize):DWORD\r | |
| 28 | \r | |
| 29 | _TEXT_REALMODE SEGMENT PARA PUBLIC USE16 'CODE'\r | |
| 30 | ASSUME CS:_TEXT_REALMODE, DS:_TEXT_REALMODE\r | |
| 31 | \r | |
| 32 | ;----------------------------------------------------------------------------\r | |
| 33 | ;\r | |
| 34 | ; Procedure: _ModuleEntryPoint\r | |
| 35 | ;\r | |
| 36 | ; Input: None\r | |
| 37 | ;\r | |
| 38 | ; Output: None\r | |
| 39 | ;\r | |
| 40 | ; Destroys: Assume all registers\r | |
| 41 | ;\r | |
| 42 | ; Description:\r | |
| 43 | ;\r | |
| 44 | ; Transition to non-paged flat-model protected mode from a\r | |
| 45 | ; hard-coded GDT that provides exactly two descriptors.\r | |
| 46 | ; This is a bare bones transition to protected mode only\r | |
| 47 | ; used for a while in PEI and possibly DXE.\r | |
| 48 | ;\r | |
| 49 | ; After enabling protected mode, a far jump is executed to\r | |
| 50 | ; transfer to PEI using the newly loaded GDT.\r | |
| 51 | ;\r | |
| 52 | ; Return: None\r | |
| 53 | ;\r | |
| 54 | ; MMX Usage:\r | |
| 55 | ; MM0 = BIST State\r | |
| 56 | ; MM5 = Save time-stamp counter value high32bit\r | |
| 57 | ; MM6 = Save time-stamp counter value low32bit.\r | |
| 58 | ;\r | |
| 59 | ;----------------------------------------------------------------------------\r | |
| 60 | \r | |
| 61 | align 4\r | |
| 62 | _ModuleEntryPoint PROC NEAR C PUBLIC\r | |
| 63 | fninit ; clear any pending Floating point exceptions\r | |
| 64 | ;\r | |
| 65 | ; Store the BIST value in mm0\r | |
| 66 | ;\r | |
| 67 | movd mm0, eax\r | |
| 68 | \r | |
| 69 | ;\r | |
| 70 | ; Save time-stamp counter value\r | |
| 71 | ; rdtsc load 64bit time-stamp counter to EDX:EAX\r | |
| 72 | ;\r | |
| 73 | rdtsc\r | |
| 74 | movd mm5, edx\r | |
| 75 | movd mm6, eax\r | |
| 76 | \r | |
| 77 | ;\r | |
| 78 | ; Load the GDT table in GdtDesc\r | |
| 79 | ;\r | |
| 80 | mov esi, OFFSET GdtDesc\r | |
| 81 | DB 66h\r | |
| 82 | lgdt fword ptr cs:[si]\r | |
| 83 | \r | |
| 84 | ;\r | |
| 85 | ; Transition to 16 bit protected mode\r | |
| 86 | ;\r | |
| 87 | mov eax, cr0 ; Get control register 0\r | |
| 88 | or eax, 00000003h ; Set PE bit (bit #0) & MP bit (bit #1)\r | |
| 89 | mov cr0, eax ; Activate protected mode\r | |
| 90 | \r | |
| 91 | mov eax, cr4 ; Get control register 4\r | |
| 92 | or eax, 00000600h ; Set OSFXSR bit (bit #9) & OSXMMEXCPT bit (bit #10)\r | |
| 93 | mov cr4, eax\r | |
| 94 | \r | |
| 95 | ;\r | |
| 96 | ; Now we're in 16 bit protected mode\r | |
| 97 | ; Set up the selectors for 32 bit protected mode entry\r | |
| 98 | ;\r | |
| 99 | mov ax, SYS_DATA_SEL\r | |
| 100 | mov ds, ax\r | |
| 101 | mov es, ax\r | |
| 102 | mov fs, ax\r | |
| 103 | mov gs, ax\r | |
| 104 | mov ss, ax\r | |
| 105 | \r | |
| 106 | ;\r | |
| 107 | ; Transition to Flat 32 bit protected mode\r | |
| 108 | ; The jump to a far pointer causes the transition to 32 bit mode\r | |
| 109 | ;\r | |
| 110 | mov esi, offset ProtectedModeEntryLinearAddress\r | |
| 111 | jmp fword ptr cs:[si]\r | |
| 112 | \r | |
| 113 | _ModuleEntryPoint ENDP\r | |
| 114 | _TEXT_REALMODE ENDS\r | |
| 115 | \r | |
| 116 | _TEXT_PROTECTED_MODE SEGMENT PARA PUBLIC USE32 'CODE'\r | |
| 117 | ASSUME CS:_TEXT_PROTECTED_MODE, DS:_TEXT_PROTECTED_MODE\r | |
| 118 | \r | |
| 119 | ;----------------------------------------------------------------------------\r | |
| 120 | ;\r | |
| 121 | ; Procedure: ProtectedModeEntryPoint\r | |
| 122 | ;\r | |
| 123 | ; Input: None\r | |
| 124 | ;\r | |
| 125 | ; Output: None\r | |
| 126 | ;\r | |
| 127 | ; Destroys: Assume all registers\r | |
| 128 | ;\r | |
| 129 | ; Description:\r | |
| 130 | ;\r | |
| 131 | ; This function handles:\r | |
| 132 | ; Call two basic APIs from FSP binary\r | |
| 133 | ; Initializes stack with some early data (BIST, PEI entry, etc)\r | |
| 134 | ;\r | |
| 135 | ; Return: None\r | |
| 136 | ;\r | |
| 137 | ;----------------------------------------------------------------------------\r | |
| 138 | \r | |
| 139 | align 4\r | |
| 140 | ProtectedModeEntryPoint PROC NEAR PUBLIC\r | |
| 141 | \r | |
| 142 | ; Find the fsp info header\r | |
| 143 | mov edi, PcdGet32 (PcdFlashFvFspBase)\r | |
| 144 | mov ecx, PcdGet32 (PcdFlashFvFspSize)\r | |
| 145 | \r | |
| 146 | mov eax, dword ptr [edi + FVH_SIGINATURE_OFFSET]\r | |
| 147 | cmp eax, FVH_SIGINATURE_VALID_VALUE\r | |
| 148 | jnz FspHeaderNotFound\r | |
| 149 | \r | |
| 150 | xor eax, eax\r | |
| 151 | mov ax, word ptr [edi + FVH_EXTHEADER_OFFSET_OFFSET]\r | |
| 152 | cmp ax, 0\r | |
| 153 | jnz FspFvExtHeaderExist\r | |
| 154 | \r | |
| 155 | xor eax, eax\r | |
| 156 | mov ax, word ptr [edi + FVH_HEADER_LENGTH_OFFSET] ; Bypass Fv Header\r | |
| 157 | add edi, eax\r | |
| 158 | jmp FspCheckFfsHeader\r | |
| 159 | \r | |
| 160 | FspFvExtHeaderExist:\r | |
| 161 | add edi, eax\r | |
| 162 | mov eax, dword ptr [edi + FVH_EXTHEADER_SIZE_OFFSET] ; Bypass Ext Fv Header\r | |
| 163 | add edi, eax\r | |
| 164 | \r | |
| 165 | ; Round up to 8 byte alignment\r | |
| 166 | mov eax, edi\r | |
| 167 | and al, 07h\r | |
| 168 | jz FspCheckFfsHeader\r | |
| 169 | \r | |
| 170 | and edi, 0FFFFFFF8h\r | |
| 171 | add edi, 08h\r | |
| 172 | \r | |
| 173 | FspCheckFfsHeader:\r | |
| 174 | ; Check the ffs guid\r | |
| 175 | mov eax, dword ptr [edi]\r | |
| 176 | cmp eax, FSP_HEADER_GUID_DWORD1\r | |
| 177 | jnz FspHeaderNotFound\r | |
| 178 | \r | |
| 179 | mov eax, dword ptr [edi + 4]\r | |
| 180 | cmp eax, FSP_HEADER_GUID_DWORD2\r | |
| 181 | jnz FspHeaderNotFound\r | |
| 182 | \r | |
| 183 | mov eax, dword ptr [edi + 8]\r | |
| 184 | cmp eax, FSP_HEADER_GUID_DWORD3\r | |
| 185 | jnz FspHeaderNotFound\r | |
| 186 | \r | |
| 187 | mov eax, dword ptr [edi + 0Ch]\r | |
| 188 | cmp eax, FSP_HEADER_GUID_DWORD4\r | |
| 189 | jnz FspHeaderNotFound\r | |
| 190 | \r | |
| 191 | add edi, FFS_HEADER_SIZE_VALUE ; Bypass the ffs header\r | |
| 192 | \r | |
| 193 | ; Check the section type as raw section\r | |
| 194 | mov al, byte ptr [edi + SECTION_HEADER_TYPE_OFFSET]\r | |
| 195 | cmp al, 019h\r | |
| 196 | jnz FspHeaderNotFound\r | |
| 197 | \r | |
| 198 | add edi, RAW_SECTION_HEADER_SIZE_VALUE ; Bypass the section header\r | |
| 199 | jmp FspHeaderFound\r | |
| 200 | \r | |
| 201 | FspHeaderNotFound:\r | |
| 202 | jmp $\r | |
| 203 | \r | |
| 204 | FspHeaderFound:\r | |
| 205 | ; Get the fsp TempRamInit Api address\r | |
| 206 | mov eax, dword ptr [edi + FSP_HEADER_IMAGEBASE_OFFSET]\r | |
| 207 | add eax, dword ptr [edi + FSP_HEADER_TEMPRAMINIT_OFFSET]\r | |
| 208 | \r | |
| 209 | ; Setup the hardcode stack\r | |
| 210 | mov esp, OFFSET TempRamInitStack\r | |
| 211 | \r | |
| 212 | ; Call the fsp TempRamInit Api\r | |
| 213 | jmp eax\r | |
| 214 | \r | |
| 215 | TempRamInitDone:\r | |
| 216 | cmp eax, 0\r | |
| 217 | jnz FspApiFailed\r | |
| 218 | \r | |
| 219 | ; ECX: start of range\r | |
| 220 | ; EDX: end of range\r | |
| 221 | mov esp, edx\r | |
| 222 | push edx\r | |
| 223 | push ecx\r | |
| 224 | push eax ; zero - no hob list yet\r | |
| 225 | call CallPeiCoreEntryPoint\r | |
| 226 | \r | |
| 227 | FspApiFailed:\r | |
| 228 | jmp $\r | |
| 229 | \r | |
| 230 | align 10h\r | |
| 231 | TempRamInitStack:\r | |
| 232 | DD OFFSET TempRamInitDone\r | |
| 233 | DD OFFSET TempRamInitParams\r | |
| 234 | \r | |
| 235 | ProtectedModeEntryPoint ENDP\r | |
| 236 | \r | |
| 237 | ;\r | |
| 238 | ; ROM-based Global-Descriptor Table for the Tiano PEI Phase\r | |
| 239 | ;\r | |
| 240 | align 16\r | |
| 241 | PUBLIC BootGdtTable\r | |
| 242 | \r | |
| 243 | ;\r | |
| 244 | ; GDT[0]: 0x00: Null entry, never used.\r | |
| 245 | ;\r | |
| 246 | NULL_SEL EQU $ - GDT_BASE ; Selector [0]\r | |
| 247 | GDT_BASE:\r | |
| 248 | BootGdtTable DD 0\r | |
| 249 | DD 0\r | |
| 250 | ;\r | |
| 251 | ; Linear data segment descriptor\r | |
| 252 | ;\r | |
| 253 | LINEAR_SEL EQU $ - GDT_BASE ; Selector [0x8]\r | |
| 254 | DW 0FFFFh ; limit 0xFFFFF\r | |
| 255 | DW 0 ; base 0\r | |
| 256 | DB 0\r | |
| 257 | DB 092h ; present, ring 0, data, expand-up, writable\r | |
| 258 | DB 0CFh ; page-granular, 32-bit\r | |
| 259 | DB 0\r | |
| 260 | ;\r | |
| 261 | ; Linear code segment descriptor\r | |
| 262 | ;\r | |
| 263 | LINEAR_CODE_SEL EQU $ - GDT_BASE ; Selector [0x10]\r | |
| 264 | DW 0FFFFh ; limit 0xFFFFF\r | |
| 265 | DW 0 ; base 0\r | |
| 266 | DB 0\r | |
| 267 | DB 09Bh ; present, ring 0, data, expand-up, not-writable\r | |
| 268 | DB 0CFh ; page-granular, 32-bit\r | |
| 269 | DB 0\r | |
| 270 | ;\r | |
| 271 | ; System data segment descriptor\r | |
| 272 | ;\r | |
| 273 | SYS_DATA_SEL EQU $ - GDT_BASE ; Selector [0x18]\r | |
| 274 | DW 0FFFFh ; limit 0xFFFFF\r | |
| 275 | DW 0 ; base 0\r | |
| 276 | DB 0\r | |
| 277 | DB 093h ; present, ring 0, data, expand-up, not-writable\r | |
| 278 | DB 0CFh ; page-granular, 32-bit\r | |
| 279 | DB 0\r | |
| 280 | \r | |
| 281 | ;\r | |
| 282 | ; System code segment descriptor\r | |
| 283 | ;\r | |
| 284 | SYS_CODE_SEL EQU $ - GDT_BASE ; Selector [0x20]\r | |
| 285 | DW 0FFFFh ; limit 0xFFFFF\r | |
| 286 | DW 0 ; base 0\r | |
| 287 | DB 0\r | |
| 288 | DB 09Ah ; present, ring 0, data, expand-up, writable\r | |
| 289 | DB 0CFh ; page-granular, 32-bit\r | |
| 290 | DB 0\r | |
| 291 | ;\r | |
| 292 | ; Spare segment descriptor\r | |
| 293 | ;\r | |
| 294 | SYS16_CODE_SEL EQU $ - GDT_BASE ; Selector [0x28]\r | |
| 295 | DW 0FFFFh ; limit 0xFFFFF\r | |
| 296 | DW 0 ; base 0\r | |
| 297 | DB 0Eh ; Changed from F000 to E000.\r | |
| 298 | DB 09Bh ; present, ring 0, code, expand-up, writable\r | |
| 299 | DB 00h ; byte-granular, 16-bit\r | |
| 300 | DB 0\r | |
| 301 | ;\r | |
| 302 | ; Spare segment descriptor\r | |
| 303 | ;\r | |
| 304 | SYS16_DATA_SEL EQU $ - GDT_BASE ; Selector [0x30]\r | |
| 305 | DW 0FFFFh ; limit 0xFFFF\r | |
| 306 | DW 0 ; base 0\r | |
| 307 | DB 0\r | |
| 308 | DB 093h ; present, ring 0, data, expand-up, not-writable\r | |
| 309 | DB 00h ; byte-granular, 16-bit\r | |
| 310 | DB 0\r | |
| 311 | \r | |
| 312 | ;\r | |
| 313 | ; Spare segment descriptor\r | |
| 314 | ;\r | |
| 315 | SPARE5_SEL EQU $ - GDT_BASE ; Selector [0x38]\r | |
| 316 | DW 0 ; limit 0\r | |
| 317 | DW 0 ; base 0\r | |
| 318 | DB 0\r | |
| 319 | DB 0 ; present, ring 0, data, expand-up, writable\r | |
| 320 | DB 0 ; page-granular, 32-bit\r | |
| 321 | DB 0\r | |
| 322 | GDT_SIZE EQU $ - BootGdtTable ; Size, in bytes\r | |
| 323 | \r | |
| 324 | ;\r | |
| 325 | ; GDT Descriptor\r | |
| 326 | ;\r | |
| 327 | GdtDesc: ; GDT descriptor\r | |
| 328 | DW GDT_SIZE - 1 ; GDT limit\r | |
| 329 | DD OFFSET BootGdtTable ; GDT base address\r | |
| 330 | \r | |
| 331 | \r | |
| 332 | ProtectedModeEntryLinearAddress LABEL FWORD\r | |
| 333 | ProtectedModeEntryLinearOffset LABEL DWORD\r | |
| 334 | DD OFFSET ProtectedModeEntryPoint ; Offset of our 32 bit code\r | |
| 335 | DW LINEAR_CODE_SEL\r | |
| 336 | \r | |
| 337 | _TEXT_PROTECTED_MODE ENDS\r | |
| 338 | END\r |