Uwe Hermann | 20a98c9 | 2009-06-05 23:02:43 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2008 Rudolf Marek <r.marek@assembler.cz> |
| 5 | * Copyright (C) 2009 One Laptop per Child, Association, Inc. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | //reboot.c from linux |
| 23 | /*this file mostly copied from Rudolf's S3 patch, some changes in acpi_jump_wake()*/ |
| 24 | #include <stdint.h> |
| 25 | #include <string.h> |
| 26 | #include <arch/io.h> |
| 27 | #include <console/console.h> |
| 28 | #include <delay.h> |
| 29 | #include <part/init_timer.h>//for jaon_tsc_count_end |
| 30 | #include "wakeup.h" |
| 31 | |
| 32 | |
| 33 | |
| 34 | |
| 35 | int enable_a20(void); |
| 36 | |
| 37 | /* The following code and data reboots the machine by switching to real |
| 38 | mode and jumping to the BIOS reset entry point, as if the CPU has |
| 39 | really been reset. The previous version asked the keyboard |
| 40 | controller to pulse the CPU reset line, which is more thorough, but |
| 41 | doesn't work with at least one type of 486 motherboard. It is easy |
| 42 | to stop this code working; hence the copious comments. */ |
| 43 | |
| 44 | static unsigned long long |
| 45 | real_mode_gdt_entries [3] = |
| 46 | { |
| 47 | 0x0000000000000000ULL, /* Null descriptor */ |
| 48 | 0x00009a000000ffffULL, /* 16-bit real-mode 64k code at 0x00000000 */ |
| 49 | 0x000092000100ffffULL /* 16-bit real-mode 64k data at 0x00000100 */ |
| 50 | }; |
| 51 | |
| 52 | struct Xgt_desc_struct { |
| 53 | unsigned short size; |
| 54 | unsigned long address __attribute__((packed)); |
| 55 | unsigned short pad; |
| 56 | } __attribute__ ((packed)); |
| 57 | |
| 58 | static struct Xgt_desc_struct |
| 59 | real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries }, |
| 60 | real_mode_idt = { 0x3ff, 0 }, |
| 61 | no_idt = { 0, 0 }; |
| 62 | |
| 63 | |
| 64 | /* This is 16-bit protected mode code to disable paging and the cache, |
| 65 | switch to real mode and jump to the BIOS reset code. |
| 66 | |
| 67 | The instruction that switches to real mode by writing to CR0 must be |
| 68 | followed immediately by a far jump instruction, which set CS to a |
| 69 | valid value for real mode, and flushes the prefetch queue to avoid |
| 70 | running instructions that have already been decoded in protected |
| 71 | mode. |
| 72 | |
| 73 | Clears all the flags except ET, especially PG (paging), PE |
| 74 | (protected-mode enable) and TS (task switch for coprocessor state |
| 75 | save). Flushes the TLB after paging has been disabled. Sets CD and |
| 76 | NW, to disable the cache on a 486, and invalidates the cache. This |
| 77 | is more like the state of a 486 after reset. I don't know if |
| 78 | something else should be done for other chips. |
| 79 | |
| 80 | More could be done here to set up the registers as if a CPU reset had |
| 81 | occurred; hopefully real BIOSs don't assume much. */ |
| 82 | |
| 83 | |
| 84 | // 0x66, 0x0d, 0x00, 0x00, 0x00, 0x60, /* orl $0x60000000,%eax */ |
| 85 | |
| 86 | static unsigned char real_mode_switch [] = |
| 87 | { |
| 88 | 0x66, 0x0f, 0x20, 0xc0, /* movl %cr0,%eax */ |
| 89 | 0x24, 0xfe, /* andb $0xfe,al */ |
| 90 | 0x66, 0x0f, 0x22, 0xc0 /* movl %eax,%cr0 */ |
| 91 | }; |
| 92 | static unsigned char jump_to_wakeup [] = |
| 93 | { |
| 94 | 0xea, 0x00, 0x00, 0x00, 0xe0 /* ljmp $0xffff,$0x0000 */ |
| 95 | }; |
| 96 | |
| 97 | /* |
| 98 | * Switch to real mode and then execute the code |
| 99 | * specified by the code and length parameters. |
| 100 | * We assume that length will aways be less that 100! |
| 101 | */ |
| 102 | static unsigned char show31 [6] = |
| 103 | { |
| 104 | 0xb0, 0x31, 0xe6, 0x80, 0xeb ,0xFA /* ljmp $0xffff,$0x0000 */ |
| 105 | }; |
| 106 | static unsigned char show32 [6] = |
| 107 | { |
| 108 | 0xb0, 0x32, 0xe6, 0x80, 0xeb ,0xFA /* ljmp $0xffff,$0x0000 */ |
| 109 | }; |
| 110 | void acpi_jump_wake(u32 vector) |
| 111 | { |
| 112 | u32 tmp; |
| 113 | u16 tmpvector; |
| 114 | u32 dwEip; |
| 115 | u8 Data; |
| 116 | struct Xgt_desc_struct * wake_thunk16_Xgt_desc; |
| 117 | |
| 118 | printk_debug("IN ACPI JUMP WAKE TO %x\n", vector); |
| 119 | if (enable_a20()) |
| 120 | die("failed to enable A20\n"); |
| 121 | printk_debug("IN ACPI JUMP WAKE TO 3 %x\n", vector); |
| 122 | |
| 123 | * ((u16 *) (jump_to_wakeup+3)) = (u16)(vector>>4); |
| 124 | printk_debug("%x %x %x %x %x\n", jump_to_wakeup[0], jump_to_wakeup[1], jump_to_wakeup[2], jump_to_wakeup[3],jump_to_wakeup[4]); |
| 125 | |
| 126 | memcpy ((void *) (WAKE_THUNK16_ADDR - sizeof (real_mode_switch) - 100), |
| 127 | real_mode_switch, sizeof (real_mode_switch)); |
| 128 | memcpy ((void *) (WAKE_THUNK16_ADDR - 100), jump_to_wakeup, sizeof(jump_to_wakeup)); |
| 129 | |
| 130 | jason_tsc_count(); |
| 131 | printk_emerg("file '%s', line %d\n\n", __FILE__, __LINE__); |
| 132 | jason_tsc_count_end(); |
| 133 | |
| 134 | |
| 135 | unsigned long long * real_mode_gdt_entries_at_eseg; |
| 136 | real_mode_gdt_entries_at_eseg=WAKE_THUNK16_GDT; //copy from real_mode_gdt_entries and change limition to 1M and data base to 0; |
| 137 | real_mode_gdt_entries_at_eseg [0] = 0x0000000000000000ULL; /* Null descriptor */ |
| 138 | real_mode_gdt_entries_at_eseg [1] = 0x000f9a000000ffffULL; /* 16-bit real-mode 1M code at 0x00000000 */ |
| 139 | real_mode_gdt_entries_at_eseg [2] = 0x000f93000000ffffULL; /* 16-bit real-mode 1M data at 0x00000000 */ |
| 140 | |
| 141 | wake_thunk16_Xgt_desc=WAKE_THUNK16_XDTR; |
| 142 | wake_thunk16_Xgt_desc[0].size=sizeof (real_mode_gdt_entries) - 1; |
| 143 | wake_thunk16_Xgt_desc[0].address=(long)real_mode_gdt_entries_at_eseg; |
| 144 | wake_thunk16_Xgt_desc[1].size=0x3ff; |
| 145 | wake_thunk16_Xgt_desc[1].address=0; |
| 146 | wake_thunk16_Xgt_desc[2].size=0; |
| 147 | wake_thunk16_Xgt_desc[2].address=0; |
| 148 | |
| 149 | /*added this code to get current value of EIP |
| 150 | */ |
| 151 | __asm__ volatile ( |
| 152 | "calll geip\n\t" |
| 153 | "geip: \n\t" |
| 154 | "popl %0\n\t" |
| 155 | :"=a"(dwEip) |
| 156 | ); |
| 157 | |
| 158 | unsigned char *dest; |
| 159 | unsigned char *src; |
| 160 | src= (unsigned char *)dwEip; |
| 161 | dest=WAKE_RECOVER1M_CODE; |
| 162 | u32 i; |
| 163 | for (i = 0; i < 0x200; i++) |
| 164 | dest[i] = src[i]; |
| 165 | |
| 166 | __asm__ __volatile__ ("ljmp $0x0010,%0"//08 error |
| 167 | : |
| 168 | : "i" ((void *) (WAKE_RECOVER1M_CODE+0x20))); |
| 169 | |
| 170 | /*added 0x20 "nop" to make sure the ljmp will not jump then halt*/ |
| 171 | asm volatile("nop"); |
| 172 | asm volatile("nop"); |
| 173 | asm volatile("nop"); |
| 174 | asm volatile("nop"); |
| 175 | asm volatile("nop"); |
| 176 | asm volatile("nop"); |
| 177 | asm volatile("nop"); |
| 178 | asm volatile("nop"); |
| 179 | asm volatile("nop"); |
| 180 | asm volatile("nop"); |
| 181 | |
| 182 | asm volatile("nop"); |
| 183 | asm volatile("nop"); |
| 184 | asm volatile("nop"); |
| 185 | asm volatile("nop"); |
| 186 | asm volatile("nop"); |
| 187 | asm volatile("nop"); |
| 188 | asm volatile("nop"); |
| 189 | asm volatile("nop"); |
| 190 | asm volatile("nop"); |
| 191 | asm volatile("nop"); |
| 192 | |
| 193 | asm volatile("nop"); |
| 194 | asm volatile("nop"); |
| 195 | asm volatile("nop"); |
| 196 | asm volatile("nop"); |
| 197 | asm volatile("nop"); |
| 198 | asm volatile("nop"); |
| 199 | asm volatile("nop"); |
| 200 | asm volatile("nop"); |
| 201 | asm volatile("nop"); |
| 202 | asm volatile("nop"); |
| 203 | |
| 204 | |
| 205 | __asm__ volatile ( |
| 206 | /* set new esp, maybe ebp should not equal to esp?, |
| 207 | due to the variable in acpi_jump_wake?, anyway, this may be not a big problem. |
| 208 | and I didnt clear the area (ef000+-0x200) to zero. |
| 209 | */ |
| 210 | "movl %0, %%ebp\n\t" |
| 211 | "movl %0, %%esp\n\t" |
| 212 | ::"a"(WAKE_THUNK16_STACK) |
| 213 | ); |
| 214 | |
| 215 | |
| 216 | /* added this |
| 217 | only "src" and "dest" use the new stack, and the esp maybe also used in resumevector |
| 218 | */ |
| 219 | #if PAYLOAD_IS_SEABIOS==1 |
| 220 | // WAKE_MEM_INFO inited in get_set_top_available_mem in tables.c |
| 221 | src = (unsigned char *)((* (u32*)WAKE_MEM_INFO)- 64*1024-0x100000); |
| 222 | dest = 0; |
| 223 | for (i = 0; i < 0xa0000; i++)//if recovered 0-e0000, then when resume, before winxp turn on the desktop screen ,there is gray background which last 1sec. |
| 224 | dest[i] = src[i]; |
| 225 | /*__asm__ volatile ( |
| 226 | "movl %0, %%esi\n\t" |
| 227 | "movl $0, %%edi\n\t" |
| 228 | "movl $0xa0000, %%ecx\n\t" |
| 229 | "shrl $2, %%ecx\n\t" |
| 230 | "rep movsd\n\t" |
| 231 | ::"a"(src) |
| 232 | );*/ |
| 233 | src = (unsigned char *)((* (u32*)WAKE_MEM_INFO)- 64*1024-0x100000+0xc0000); |
| 234 | //dest = 0xc0000; |
| 235 | //for (i = 0; i < 0x20000; i++) |
| 236 | // dest[i] = src[i]; |
| 237 | /* __asm__ volatile ( |
| 238 | "movl %0, %%esi\n\t" |
| 239 | "movl $0xc0000, %%edi\n\t" |
| 240 | "movl $0x20000, %%ecx\n\t" |
| 241 | "shrl $2, %%ecx\n\t" |
| 242 | "rep movsd\n\t" |
| 243 | ::"a"(src) |
| 244 | );*/ |
| 245 | |
| 246 | |
| 247 | src = (unsigned char *)((* (u32*)WAKE_MEM_INFO)- 64*1024-0x100000+0xe0000+WAKE_SPECIAL_SIZE); |
| 248 | //dest = 0xf0000; |
| 249 | //for (i = 0; i < 0x10000; i++) |
| 250 | // dest[i] = src[i]; |
| 251 | __asm__ volatile ( |
| 252 | "movl %0, %%esi\n\t" |
| 253 | "movl %1, %%edi\n\t" |
| 254 | "movl %2, %%ecx\n\t" |
| 255 | "shrl $2, %%ecx\n\t" |
| 256 | "rep movsd\n\t" |
| 257 | ::"r"(src),"r"(0xe0000+WAKE_SPECIAL_SIZE), "r"(0x10000-WAKE_SPECIAL_SIZE) |
| 258 | ); |
| 259 | |
| 260 | src = (unsigned char *)((* (u32*)WAKE_MEM_INFO)- 64*1024-0x100000+0xf0000); |
| 261 | //dest = 0xf0000; |
| 262 | //for (i = 0; i < 0x10000; i++) |
| 263 | // dest[i] = src[i]; |
| 264 | __asm__ volatile ( |
| 265 | "movl %0, %%esi\n\t" |
| 266 | "movl $0xf0000, %%edi\n\t" |
| 267 | "movl $0x10000, %%ecx\n\t" |
| 268 | "shrl $2, %%ecx\n\t" |
| 269 | "rep movsd\n\t" |
| 270 | ::"a"(src) |
| 271 | ); |
| 272 | |
| 273 | asm volatile("wbinvd"); |
| 274 | #endif |
| 275 | /* Set up the IDT for real mode. */ |
| 276 | asm volatile("lidt %0"::"m" (wake_thunk16_Xgt_desc[1])); |
| 277 | |
| 278 | /* Set up a GDT from which we can load segment descriptors for real |
| 279 | mode. The GDT is not used in real mode; it is just needed here to |
| 280 | prepare the descriptors. */ |
| 281 | asm volatile("lgdt %0"::"m" (wake_thunk16_Xgt_desc[0])); |
| 282 | |
| 283 | /* Load the data segment registers, and thus the descriptors ready for |
| 284 | real mode. The base address of each segment is 0x100, 16 times the |
| 285 | selector value being loaded here. This is so that the segment |
| 286 | registers don't have to be reloaded after switching to real mode: |
| 287 | the values are consistent for real mode operation already. */ |
| 288 | |
| 289 | __asm__ __volatile__ ("movl $0x0010,%%eax\n" |
| 290 | "\tmovl %%eax,%%ds\n" |
| 291 | "\tmovl %%eax,%%es\n" |
| 292 | "\tmovl %%eax,%%fs\n" |
| 293 | "\tmovl %%eax,%%gs\n" |
| 294 | "\tmovl %%eax,%%ss" : : : "eax"); |
| 295 | |
| 296 | /* Jump to the 16-bit code that we copied earlier. It disables paging |
| 297 | and the cache, switches to real mode, and jumps to the BIOS reset |
| 298 | entry point. */ |
| 299 | |
| 300 | __asm__ __volatile__ ("ljmp $0x0008,%0" |
| 301 | : |
| 302 | : "i" ((void *) (WAKE_THUNK16_ADDR - sizeof (real_mode_switch) - 100))); |
| 303 | } |
| 304 | |
| 305 | |
| 306 | /* -*- linux-c -*- ------------------------------------------------------- * |
| 307 | * |
| 308 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 309 | * Copyright 2007 rPath, Inc. - All Rights Reserved |
| 310 | * |
| 311 | * This file is part of the Linux kernel, and is made available under |
| 312 | * the terms of the GNU General Public License version 2. |
| 313 | * |
| 314 | * ----------------------------------------------------------------------- */ |
| 315 | |
| 316 | /* |
| 317 | * arch/i386/boot/a20.c |
| 318 | * |
| 319 | * Enable A20 gate (return -1 on failure) |
| 320 | */ |
| 321 | |
| 322 | //#include "boot.h" |
| 323 | |
| 324 | #define MAX_8042_LOOPS 100000 |
| 325 | |
| 326 | static int empty_8042(void) |
| 327 | { |
| 328 | u8 status; |
| 329 | int loops = MAX_8042_LOOPS; |
| 330 | |
| 331 | while (loops--) { |
| 332 | udelay(1); |
| 333 | |
| 334 | status = inb(0x64); |
| 335 | if (status & 1) { |
| 336 | /* Read and discard input data */ |
| 337 | udelay(1); |
| 338 | (void)inb(0x60); |
| 339 | } else if (!(status & 2)) { |
| 340 | /* Buffers empty, finished! */ |
| 341 | return 0; |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | return -1; |
| 346 | } |
| 347 | |
| 348 | /* Returns nonzero if the A20 line is enabled. The memory address |
| 349 | used as a test is the int $0x80 vector, which should be safe. */ |
| 350 | |
| 351 | #define A20_TEST_ADDR (4*0x80) |
| 352 | #define A20_TEST_SHORT 32 |
| 353 | #define A20_TEST_LONG 2097152 /* 2^21 */ |
| 354 | |
| 355 | static int a20_test(int loops) |
| 356 | { |
| 357 | int ok = 0; |
| 358 | int saved, ctr; |
| 359 | |
| 360 | // set_fs(0x0000); |
| 361 | // set_gs(0xffff); |
| 362 | |
| 363 | saved = ctr = *((u32*) A20_TEST_ADDR); |
| 364 | |
| 365 | while (loops--) { |
| 366 | //wrfs32(++ctr, A20_TEST_ADDR); |
| 367 | |
| 368 | *((u32*) A20_TEST_ADDR) = ++ctr; |
| 369 | |
| 370 | udelay(1); /* Serialize and make delay constant */ |
| 371 | |
| 372 | ok = *((u32 *) A20_TEST_ADDR+0xffff0+0x10) ^ ctr; |
| 373 | if (ok) |
| 374 | break; |
| 375 | } |
| 376 | |
| 377 | *((u32*) A20_TEST_ADDR) = saved; |
| 378 | return ok; |
| 379 | } |
| 380 | |
| 381 | /* Quick test to see if A20 is already enabled */ |
| 382 | static int a20_test_short(void) |
| 383 | { |
| 384 | return a20_test(A20_TEST_SHORT); |
| 385 | } |
| 386 | |
| 387 | /* Longer test that actually waits for A20 to come on line; this |
| 388 | is useful when dealing with the KBC or other slow external circuitry. */ |
| 389 | static int a20_test_long(void) |
| 390 | { |
| 391 | return a20_test(A20_TEST_LONG); |
| 392 | } |
| 393 | |
| 394 | static void enable_a20_kbc(void) |
| 395 | { |
| 396 | empty_8042(); |
| 397 | |
| 398 | outb(0xd1, 0x64); /* Command write */ |
| 399 | empty_8042(); |
| 400 | |
| 401 | outb(0xdf, 0x60); /* A20 on */ |
| 402 | empty_8042(); |
| 403 | } |
| 404 | |
| 405 | static void enable_a20_fast(void) |
| 406 | { |
| 407 | u8 port_a; |
| 408 | |
| 409 | port_a = inb(0x92); /* Configuration port A */ |
| 410 | port_a |= 0x02; /* Enable A20 */ |
| 411 | port_a &= ~0x01; /* Do not reset machine */ |
| 412 | outb(port_a, 0x92); |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Actual routine to enable A20; return 0 on ok, -1 on failure |
| 417 | */ |
| 418 | |
| 419 | #define A20_ENABLE_LOOPS 255 /* Number of times to try */ |
| 420 | |
| 421 | int enable_a20(void) |
| 422 | { |
| 423 | int loops = A20_ENABLE_LOOPS; |
| 424 | |
| 425 | while (loops--) { |
| 426 | /* First, check to see if A20 is already enabled |
| 427 | (legacy free, etc.) */ |
| 428 | if (a20_test_short()) |
| 429 | return 0; |
| 430 | |
| 431 | /* Try enabling A20 through the keyboard controller */ |
| 432 | empty_8042(); |
| 433 | //if (a20_test_short()) |
| 434 | // return 0; /* BIOS worked, but with delayed reaction */ |
| 435 | |
| 436 | enable_a20_kbc(); |
| 437 | if (a20_test_long()) |
| 438 | return 0; |
| 439 | |
| 440 | /* Finally, try enabling the "fast A20 gate" */ |
| 441 | enable_a20_fast(); |
| 442 | if (a20_test_long()) |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | return -1; |
| 447 | } |