1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * head.S: The initial boot code for the Sparc port of Linux. 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1995,1999 Pete Zaitcev (zaitcev@yahoo.com) 7 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) 8 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org) 10 * 11 * CompactPCI platform by Eric Brower, 1999. 12 */ 13 14 #include <linux/export.h> 15 #include <linux/version.h> 16 #include <linux/init.h> 17 18 #include <asm/head.h> 19 #include <asm/asi.h> 20 #include <asm/contregs.h> 21 #include <asm/ptrace.h> 22 #include <asm/psr.h> 23 #include <asm/page.h> 24 #include <asm/kdebug.h> 25 #include <asm/winmacro.h> 26 #include <asm/thread_info.h> /* TI_UWINMASK */ 27 #include <asm/errno.h> 28 #include <asm/pgtable.h> /* PGDIR_SHIFT */ 29 30 .data 31 /* The following are used with the prom_vector node-ops to figure out 32 * the cpu-type 33 */ 34 .align 4 35 .globl cputypval 36 cputypval: 37 .asciz "sun4m" 38 .ascii " " 39 40 /* Tested on SS-5, SS-10 */ 41 .align 4 42 cputypvar: 43 .asciz "compatible" 44 45 .align 4 46 47 notsup: 48 .asciz "Sparc-Linux sun4/sun4c or MMU-less not supported\n\n" 49 .align 4 50 51 sun4e_notsup: 52 .asciz "Sparc-Linux sun4e support does not exist\n\n" 53 .align 4 54 55 /* The trap-table - located in the __HEAD section */ 56 #include "ttable_32.S" 57 58 .align PAGE_SIZE 59 60 /* This was the only reasonable way I could think of to properly align 61 * these page-table data structures. 62 */ 63 .globl empty_zero_page 64 empty_zero_page: .skip PAGE_SIZE 65 EXPORT_SYMBOL(empty_zero_page) 66 67 .global root_flags 68 .global ram_flags 69 .global root_dev 70 .global sparc_ramdisk_image 71 .global sparc_ramdisk_size 72 73 /* This stuff has to be in sync with SILO and other potential boot loaders 74 * Fields should be kept upward compatible and whenever any change is made, 75 * HdrS version should be incremented. 76 */ 77 .ascii "HdrS" 78 .word LINUX_VERSION_CODE 79 .half 0x0203 /* HdrS version */ 80 root_flags: 81 .half 1 82 root_dev: 83 .half 0 84 ram_flags: 85 .half 0 86 sparc_ramdisk_image: 87 .word 0 88 sparc_ramdisk_size: 89 .word 0 90 .word reboot_command 91 .word 0, 0, 0 92 .word _end 93 94 /* Cool, here we go. Pick up the romvec pointer in %o0 and stash it in 95 * %g7 and at prom_vector_p. And also quickly check whether we are on 96 * a v0, v2, or v3 prom. 97 */ 98 gokernel: 99 /* Ok, it's nice to know, as early as possible, if we 100 * are already mapped where we expect to be in virtual 101 * memory. The Solaris /boot elf format bootloader 102 * will peek into our elf header and load us where 103 * we want to be, otherwise we have to re-map. 104 * 105 * Some boot loaders don't place the jmp'rs address 106 * in %o7, so we do a pc-relative call to a local 107 * label, then see what %o7 has. 108 */ 109 110 mov %o7, %g4 ! Save %o7 111 112 /* Jump to it, and pray... */ 113 current_pc: 114 call 1f 115 nop 116 117 1: 118 mov %o7, %g3 119 120 tst %o0 121 bne 2f 122 mov %g4, %o7 /* Previous %o7. */ 123 sethi %hi(no_sun4u_here), %l1 124 jmpl %l1 + %lo(no_sun4u_here), %g0 125 nop 126 2: 127 mov %o0, %l0 ! stash away romvec 128 mov %o0, %g7 ! put it here too 129 mov %o1, %l1 ! stash away debug_vec too 130 131 /* Ok, let's check out our run time program counter. */ 132 set current_pc, %g5 133 cmp %g3, %g5 134 be already_mapped 135 nop 136 137 /* %l6 will hold the offset we have to subtract 138 * from absolute symbols in order to access areas 139 * in our own image. If already mapped this is 140 * just plain zero, else it is KERNBASE. 141 */ 142 set KERNBASE, %l6 143 b copy_prom_lvl14 144 nop 145 146 already_mapped: 147 mov 0, %l6 148 149 /* Copy over the Prom's level 14 clock handler. */ 150 copy_prom_lvl14: 151 #if 1 152 /* DJHR 153 * preserve our linked/calculated instructions 154 */ 155 set lvl14_save, %g1 156 set t_irq14, %g3 157 sub %g1, %l6, %g1 ! translate to physical 158 sub %g3, %l6, %g3 ! translate to physical 159 ldd [%g3], %g4 160 std %g4, [%g1] 161 ldd [%g3+8], %g4 162 std %g4, [%g1+8] 163 #endif 164 rd %tbr, %g1 165 andn %g1, 0xfff, %g1 ! proms trap table base 166 or %g0, (0x1e<<4), %g2 ! offset to lvl14 intr 167 or %g1, %g2, %g2 168 set t_irq14, %g3 169 sub %g3, %l6, %g3 170 ldd [%g2], %g4 171 std %g4, [%g3] 172 ldd [%g2 + 0x8], %g4 173 std %g4, [%g3 + 0x8] ! Copy proms handler 174 175 /* DON'T TOUCH %l0 thru %l5 in these remapping routines, 176 * we need their values afterwards! 177 */ 178 179 /* Now check whether we are already mapped, if we 180 * are we can skip all this garbage coming up. 181 */ 182 copy_prom_done: 183 cmp %l6, 0 184 be go_to_highmem ! this will be a nop then 185 nop 186 187 /* Validate that we are in fact running on an 188 * SRMMU based cpu. 189 */ 190 set 0x4000, %g6 191 cmp %g7, %g6 192 bne not_a_sun4 193 nop 194 195 halt_notsup: 196 ld [%g7 + 0x68], %o1 197 set notsup, %o0 198 sub %o0, %l6, %o0 199 call %o1 200 nop 201 sethi %hi(halt_me), %o0 202 jmpl %o0 + %lo(halt_me), %g0 203 nop 204 205 not_a_sun4: 206 /* It looks like this is a machine we support. 207 * Now find out what MMU we are dealing with 208 * LEON - identified by the psr.impl field 209 * Viking - identified by the psr.impl field 210 * In all other cases a sun4m srmmu. 211 * We check that the MMU is enabled in all cases. 212 */ 213 214 /* Check if this is a LEON CPU */ 215 rd %psr, %g3 216 srl %g3, PSR_IMPL_SHIFT, %g3 217 and %g3, PSR_IMPL_SHIFTED_MASK, %g3 218 cmp %g3, PSR_IMPL_LEON 219 be leon_remap /* It is a LEON - jump */ 220 nop 221 222 /* Sanity-check, is MMU enabled */ 223 lda [%g0] ASI_M_MMUREGS, %g1 224 andcc %g1, 1, %g0 225 be halt_notsup 226 nop 227 228 /* Check for a viking (TI) module. */ 229 cmp %g3, PSR_IMPL_TI 230 bne srmmu_not_viking 231 nop 232 233 /* Figure out what kind of viking we are on. 234 * We need to know if we have to play with the 235 * AC bit and disable traps or not. 236 */ 237 238 /* I've only seen MicroSparc's on SparcClassics with this 239 * bit set. 240 */ 241 set 0x800, %g2 242 lda [%g0] ASI_M_MMUREGS, %g3 ! peek in the control reg 243 and %g2, %g3, %g3 244 subcc %g3, 0x0, %g0 245 bnz srmmu_not_viking ! is in mbus mode 246 nop 247 248 rd %psr, %g3 ! DO NOT TOUCH %g3 249 andn %g3, PSR_ET, %g2 250 wr %g2, 0x0, %psr 251 WRITE_PAUSE 252 253 /* Get context table pointer, then convert to 254 * a physical address, which is 36 bits. 255 */ 256 set AC_M_CTPR, %g4 257 lda [%g4] ASI_M_MMUREGS, %g4 258 sll %g4, 0x4, %g4 ! We use this below 259 ! DO NOT TOUCH %g4 260 261 /* Set the AC bit in the Viking's MMU control reg. */ 262 lda [%g0] ASI_M_MMUREGS, %g5 ! DO NOT TOUCH %g5 263 set 0x8000, %g6 ! AC bit mask 264 or %g5, %g6, %g6 ! Or it in... 265 sta %g6, [%g0] ASI_M_MMUREGS ! Close your eyes... 266 267 /* Grrr, why does it seem like every other load/store 268 * on the sun4m is in some ASI space... 269 * Fine with me, let's get the pointer to the level 1 270 * page table directory and fetch its entry. 271 */ 272 lda [%g4] ASI_M_BYPASS, %o1 ! This is a level 1 ptr 273 srl %o1, 0x4, %o1 ! Clear low 4 bits 274 sll %o1, 0x8, %o1 ! Make physical 275 276 /* Ok, pull in the PTD. */ 277 lda [%o1] ASI_M_BYPASS, %o2 ! This is the 0x0 16MB pgd 278 279 /* Calculate to KERNBASE entry. */ 280 add %o1, KERNBASE >> (PGDIR_SHIFT - 2), %o3 281 282 /* Poke the entry into the calculated address. */ 283 sta %o2, [%o3] ASI_M_BYPASS 284 285 /* I don't get it Sun, if you engineered all these 286 * boot loaders and the PROM (thank you for the debugging 287 * features btw) why did you not have them load kernel 288 * images up in high address space, since this is necessary 289 * for ABI compliance anyways? Does this low-mapping provide 290 * enhanced interoperability? 291 * 292 * "The PROM is the computer." 293 */ 294 295 /* Ok, restore the MMU control register we saved in %g5 */ 296 sta %g5, [%g0] ASI_M_MMUREGS ! POW... ouch 297 298 /* Turn traps back on. We saved it in %g3 earlier. */ 299 wr %g3, 0x0, %psr ! tick tock, tick tock 300 301 /* Now we burn precious CPU cycles due to bad engineering. */ 302 WRITE_PAUSE 303 304 /* Wow, all that just to move a 32-bit value from one 305 * place to another... Jump to high memory. 306 */ 307 b go_to_highmem 308 nop 309 310 srmmu_not_viking: 311 /* This works on viking's in Mbus mode and all 312 * other MBUS modules. It is virtually the same as 313 * the above madness sans turning traps off and flipping 314 * the AC bit. 315 */ 316 set AC_M_CTPR, %g1 317 lda [%g1] ASI_M_MMUREGS, %g1 ! get ctx table ptr 318 sll %g1, 0x4, %g1 ! make physical addr 319 lda [%g1] ASI_M_BYPASS, %g1 ! ptr to level 1 pg_table 320 srl %g1, 0x4, %g1 321 sll %g1, 0x8, %g1 ! make phys addr for l1 tbl 322 323 lda [%g1] ASI_M_BYPASS, %g2 ! get level1 entry for 0x0 324 add %g1, KERNBASE >> (PGDIR_SHIFT - 2), %g3 325 sta %g2, [%g3] ASI_M_BYPASS ! place at KERNBASE entry 326 b go_to_highmem 327 nop ! wheee.... 328 329 330 leon_remap: 331 /* Sanity-check, is MMU enabled */ 332 lda [%g0] ASI_LEON_MMUREGS, %g1 333 andcc %g1, 1, %g0 334 be halt_notsup 335 nop 336 337 /* Same code as in the srmmu_not_viking case, 338 * with the LEON ASI for mmuregs 339 */ 340 set AC_M_CTPR, %g1 341 lda [%g1] ASI_LEON_MMUREGS, %g1 ! get ctx table ptr 342 sll %g1, 0x4, %g1 ! make physical addr 343 lda [%g1] ASI_M_BYPASS, %g1 ! ptr to level 1 pg_table 344 srl %g1, 0x4, %g1 345 sll %g1, 0x8, %g1 ! make phys addr for l1 tbl 346 347 lda [%g1] ASI_M_BYPASS, %g2 ! get level1 entry for 0x0 348 add %g1, KERNBASE >> (PGDIR_SHIFT - 2), %g3 349 sta %g2, [%g3] ASI_M_BYPASS ! place at KERNBASE entry 350 b go_to_highmem 351 nop ! wheee.... 352 353 /* Now do a non-relative jump so that PC is in high-memory */ 354 go_to_highmem: 355 set execute_in_high_mem, %g1 356 jmpl %g1, %g0 357 nop 358 359 /* The code above should be at beginning and we have to take care about 360 * short jumps, as branching to .init.text section from .text is usually 361 * impossible */ 362 __INIT 363 /* Acquire boot time privileged register values, this will help debugging. 364 * I figure out and store nwindows and nwindowsm1 later on. 365 */ 366 execute_in_high_mem: 367 mov %l0, %o0 ! put back romvec 368 mov %l1, %o1 ! and debug_vec 369 370 sethi %hi(prom_vector_p), %g1 371 st %o0, [%g1 + %lo(prom_vector_p)] 372 373 sethi %hi(linux_dbvec), %g1 374 st %o1, [%g1 + %lo(linux_dbvec)] 375 376 /* Get the machine type via the romvec 377 * getprops node operation 378 */ 379 add %g7, 0x1c, %l1 380 ld [%l1], %l0 381 ld [%l0], %l0 382 call %l0 383 or %g0, %g0, %o0 ! next_node(0) = first_node 384 or %o0, %g0, %g6 385 386 sethi %hi(cputypvar), %o1 ! First node has cpu-arch 387 or %o1, %lo(cputypvar), %o1 388 sethi %hi(cputypval), %o2 ! information, the string 389 or %o2, %lo(cputypval), %o2 390 ld [%l1], %l0 ! 'compatible' tells 391 ld [%l0 + 0xc], %l0 ! that we want 'sun4x' where 392 call %l0 ! x is one of 'm', 'd' or 'e'. 393 nop ! %o2 holds pointer 394 ! to a buf where above string 395 ! will get stored by the prom. 396 397 398 /* Check value of "compatible" property. 399 * "value" => "model" 400 * leon => sparc_leon 401 * sun4m => sun4m 402 * sun4s => sun4m 403 * sun4d => sun4d 404 * sun4e => "no_sun4e_here" 405 * '*' => "no_sun4u_here" 406 * Check single letters only 407 */ 408 409 set cputypval, %o2 410 /* If cputypval[0] == 'l' (lower case letter L) this is leon */ 411 ldub [%o2], %l1 412 cmp %l1, 'l' 413 be leon_init 414 nop 415 416 /* Check cputypval[4] to find the sun model */ 417 ldub [%o2 + 0x4], %l1 418 419 cmp %l1, 'm' 420 be sun4m_init 421 cmp %l1, 's' 422 be sun4m_init 423 cmp %l1, 'd' 424 be sun4d_init 425 cmp %l1, 'e' 426 be no_sun4e_here ! Could be a sun4e. 427 nop 428 b no_sun4u_here ! AIEEE, a V9 sun4u... Get our BIG BROTHER kernel :)) 429 nop 430 431 leon_init: 432 /* LEON CPU - set boot_cpu_id */ 433 sethi %hi(boot_cpu_id), %g2 ! boot-cpu index 434 435 #ifdef CONFIG_SMP 436 ldub [%g2 + %lo(boot_cpu_id)], %g1 437 cmp %g1, 0xff ! unset means first CPU 438 be 1f 439 sethi %hi(leon_smp_cpu_startup), %g1 440 jmpl %g1 + %lo(leon_smp_cpu_startup), %g0 441 nop 442 1: 443 #endif 444 /* Get CPU-ID from most significant 4-bit of ASR17 */ 445 rd %asr17, %g1 446 srl %g1, 28, %g1 447 448 /* Update boot_cpu_id only on boot cpu */ 449 stub %g1, [%g2 + %lo(boot_cpu_id)] 450 451 ba continue_boot 452 nop 453 454 /* CPUID in bootbus can be found at PA 0xff0140000 */ 455 #define SUN4D_BOOTBUS_CPUID 0xf0140000 456 457 sun4d_init: 458 /* Need to patch call to handler_irq */ 459 set patch_handler_irq, %g4 460 set sun4d_handler_irq, %g5 461 sethi %hi(0x40000000), %g3 ! call 462 sub %g5, %g4, %g5 463 srl %g5, 2, %g5 464 or %g5, %g3, %g5 465 st %g5, [%g4] 466 467 #ifdef CONFIG_SMP 468 /* Get our CPU id out of bootbus */ 469 set SUN4D_BOOTBUS_CPUID, %g3 470 lduba [%g3] ASI_M_CTL, %g3 471 and %g3, 0xf8, %g3 472 srl %g3, 3, %g4 473 sta %g4, [%g0] ASI_M_VIKING_TMP1 474 sethi %hi(boot_cpu_id), %g5 475 stb %g4, [%g5 + %lo(boot_cpu_id)] 476 #endif 477 478 /* Fall through to sun4m_init */ 479 480 sun4m_init: 481 /* Ok, the PROM could have done funny things and apple cider could still 482 * be sitting in the fault status/address registers. Read them all to 483 * clear them so we don't get magic faults later on. 484 */ 485 /* This sucks, apparently this makes Vikings call prom panic, will fix later */ 486 2: 487 rd %psr, %o1 488 srl %o1, PSR_IMPL_SHIFT, %o1 ! Get a type of the CPU 489 490 subcc %o1, PSR_IMPL_TI, %g0 ! TI: Viking or MicroSPARC 491 be continue_boot 492 nop 493 494 set AC_M_SFSR, %o0 495 lda [%o0] ASI_M_MMUREGS, %g0 496 set AC_M_SFAR, %o0 497 lda [%o0] ASI_M_MMUREGS, %g0 498 499 /* Fujitsu MicroSPARC-II has no asynchronous flavors of FARs */ 500 subcc %o1, 0, %g0 501 be continue_boot 502 nop 503 504 set AC_M_AFSR, %o0 505 lda [%o0] ASI_M_MMUREGS, %g0 506 set AC_M_AFAR, %o0 507 lda [%o0] ASI_M_MMUREGS, %g0 508 nop 509 510 511 continue_boot: 512 513 /* Aieee, now set PC and nPC, enable traps, give ourselves a stack and it's 514 * show-time! 515 */ 516 /* Turn on Supervisor, EnableFloating, and all the PIL bits. 517 * Also puts us in register window zero with traps off. 518 */ 519 set (PSR_PS | PSR_S | PSR_PIL | PSR_EF), %g2 520 wr %g2, 0x0, %psr 521 WRITE_PAUSE 522 523 /* I want a kernel stack NOW! */ 524 set init_thread_union, %g1 525 set (THREAD_SIZE - STACKFRAME_SZ - TRACEREG_SZ), %g2 526 add %g1, %g2, %sp 527 mov 0, %fp /* And for good luck */ 528 529 /* Zero out our BSS section. */ 530 set __bss_start , %o0 ! First address of BSS 531 set _end , %o1 ! Last address of BSS 532 add %o0, 0x1, %o0 533 1: 534 stb %g0, [%o0] 535 subcc %o0, %o1, %g0 536 bl 1b 537 add %o0, 0x1, %o0 538 539 /* If boot_cpu_id has not been setup by machine specific 540 * init-code above we default it to zero. 541 */ 542 sethi %hi(boot_cpu_id), %g2 543 ldub [%g2 + %lo(boot_cpu_id)], %g3 544 cmp %g3, 0xff 545 bne 1f 546 nop 547 mov %g0, %g3 548 stub %g3, [%g2 + %lo(boot_cpu_id)] 549 550 1: sll %g3, 2, %g3 551 552 /* Initialize the uwinmask value for init task just in case. 553 * But first make current_set[boot_cpu_id] point to something useful. 554 */ 555 set init_thread_union, %g6 556 set current_set, %g2 557 #ifdef CONFIG_SMP 558 st %g6, [%g2] 559 add %g2, %g3, %g2 560 #endif 561 st %g6, [%g2] 562 563 st %g0, [%g6 + TI_UWINMASK] 564 565 /* Compute NWINDOWS and stash it away. Now uses %wim trick explained 566 * in the V8 manual. Ok, this method seems to work, Sparc is cool... 567 * No, it doesn't work, have to play the save/readCWP/restore trick. 568 */ 569 570 wr %g0, 0x0, %wim ! so we do not get a trap 571 WRITE_PAUSE 572 573 save 574 575 rd %psr, %g3 576 577 restore 578 579 and %g3, 0x1f, %g3 580 add %g3, 0x1, %g3 581 582 mov 2, %g1 583 wr %g1, 0x0, %wim ! make window 1 invalid 584 WRITE_PAUSE 585 586 cmp %g3, 0x7 587 bne 2f 588 nop 589 590 /* Adjust our window handling routines to 591 * do things correctly on 7 window Sparcs. 592 */ 593 594 #define PATCH_INSN(src, dest) \ 595 set src, %g5; \ 596 set dest, %g2; \ 597 ld [%g5], %g4; \ 598 st %g4, [%g2]; 599 600 /* Patch for window spills... */ 601 PATCH_INSN(spnwin_patch1_7win, spnwin_patch1) 602 PATCH_INSN(spnwin_patch2_7win, spnwin_patch2) 603 PATCH_INSN(spnwin_patch3_7win, spnwin_patch3) 604 605 /* Patch for window fills... */ 606 PATCH_INSN(fnwin_patch1_7win, fnwin_patch1) 607 PATCH_INSN(fnwin_patch2_7win, fnwin_patch2) 608 609 /* Patch for trap entry setup... */ 610 PATCH_INSN(tsetup_7win_patch1, tsetup_patch1) 611 PATCH_INSN(tsetup_7win_patch2, tsetup_patch2) 612 PATCH_INSN(tsetup_7win_patch3, tsetup_patch3) 613 PATCH_INSN(tsetup_7win_patch4, tsetup_patch4) 614 PATCH_INSN(tsetup_7win_patch5, tsetup_patch5) 615 PATCH_INSN(tsetup_7win_patch6, tsetup_patch6) 616 617 /* Patch for returning from traps... */ 618 PATCH_INSN(rtrap_7win_patch1, rtrap_patch1) 619 PATCH_INSN(rtrap_7win_patch2, rtrap_patch2) 620 PATCH_INSN(rtrap_7win_patch3, rtrap_patch3) 621 PATCH_INSN(rtrap_7win_patch4, rtrap_patch4) 622 PATCH_INSN(rtrap_7win_patch5, rtrap_patch5) 623 624 /* Patch for killing user windows from the register file. */ 625 PATCH_INSN(kuw_patch1_7win, kuw_patch1) 626 627 /* Now patch the kernel window flush sequences. 628 * This saves 2 traps on every switch and fork. 629 */ 630 set 0x01000000, %g4 631 set flush_patch_one, %g5 632 st %g4, [%g5 + 0x18] 633 st %g4, [%g5 + 0x1c] 634 set flush_patch_two, %g5 635 st %g4, [%g5 + 0x18] 636 st %g4, [%g5 + 0x1c] 637 set flush_patch_three, %g5 638 st %g4, [%g5 + 0x18] 639 st %g4, [%g5 + 0x1c] 640 set flush_patch_four, %g5 641 st %g4, [%g5 + 0x18] 642 st %g4, [%g5 + 0x1c] 643 set flush_patch_exception, %g5 644 st %g4, [%g5 + 0x18] 645 st %g4, [%g5 + 0x1c] 646 set flush_patch_switch, %g5 647 st %g4, [%g5 + 0x18] 648 st %g4, [%g5 + 0x1c] 649 650 2: 651 sethi %hi(nwindows), %g4 652 st %g3, [%g4 + %lo(nwindows)] ! store final value 653 sub %g3, 0x1, %g3 654 sethi %hi(nwindowsm1), %g4 655 st %g3, [%g4 + %lo(nwindowsm1)] 656 657 /* Here we go, start using Linux's trap table... */ 658 set trapbase, %g3 659 wr %g3, 0x0, %tbr 660 WRITE_PAUSE 661 662 /* Finally, turn on traps so that we can call c-code. */ 663 rd %psr, %g3 664 wr %g3, 0x0, %psr 665 WRITE_PAUSE 666 667 wr %g3, PSR_ET, %psr 668 WRITE_PAUSE 669 670 /* Call sparc32_start_kernel(struct linux_romvec *rp) */ 671 sethi %hi(prom_vector_p), %g5 672 ld [%g5 + %lo(prom_vector_p)], %o0 673 call sparc32_start_kernel 674 nop 675 676 /* We should not get here. */ 677 call halt_me 678 nop 679 680 no_sun4e_here: 681 ld [%g7 + 0x68], %o1 682 set sun4e_notsup, %o0 683 call %o1 684 nop 685 b halt_me 686 nop 687 688 __INITDATA 689 690 sun4u_1: 691 .asciz "finddevice" 692 .align 4 693 sun4u_2: 694 .asciz "/chosen" 695 .align 4 696 sun4u_3: 697 .asciz "getprop" 698 .align 4 699 sun4u_4: 700 .asciz "stdout" 701 .align 4 702 sun4u_5: 703 .asciz "write" 704 .align 4 705 sun4u_6: 706 .asciz "\n\rOn sun4u you have to use sparc64 kernel\n\rand not a sparc32 version\n\r\n\r" 707 sun4u_6e: 708 .align 4 709 sun4u_7: 710 .asciz "exit" 711 .align 8 712 sun4u_a1: 713 .word 0, sun4u_1, 0, 1, 0, 1, 0, sun4u_2, 0 714 sun4u_r1: 715 .word 0 716 sun4u_a2: 717 .word 0, sun4u_3, 0, 4, 0, 1, 0 718 sun4u_i2: 719 .word 0, 0, sun4u_4, 0, sun4u_1, 0, 8, 0 720 sun4u_r2: 721 .word 0 722 sun4u_a3: 723 .word 0, sun4u_5, 0, 3, 0, 1, 0 724 sun4u_i3: 725 .word 0, 0, sun4u_6, 0, sun4u_6e - sun4u_6 - 1, 0 726 sun4u_r3: 727 .word 0 728 sun4u_a4: 729 .word 0, sun4u_7, 0, 0, 0, 0 730 sun4u_r4: 731 732 __INIT 733 no_sun4u_here: 734 set sun4u_a1, %o0 735 set current_pc, %l2 736 cmp %l2, %g3 737 be 1f 738 mov %o4, %l0 739 sub %g3, %l2, %l6 740 add %o0, %l6, %o0 741 mov %o0, %l4 742 mov sun4u_r4 - sun4u_a1, %l3 743 ld [%l4], %l5 744 2: 745 add %l4, 4, %l4 746 cmp %l5, %l2 747 add %l5, %l6, %l5 748 bgeu,a 3f 749 st %l5, [%l4 - 4] 750 3: 751 subcc %l3, 4, %l3 752 bne 2b 753 ld [%l4], %l5 754 1: 755 call %l0 756 mov %o0, %l1 757 758 ld [%l1 + (sun4u_r1 - sun4u_a1)], %o1 759 add %l1, (sun4u_a2 - sun4u_a1), %o0 760 call %l0 761 st %o1, [%o0 + (sun4u_i2 - sun4u_a2)] 762 763 ld [%l1 + (sun4u_1 - sun4u_a1)], %o1 764 add %l1, (sun4u_a3 - sun4u_a1), %o0 765 call %l0 766 st %o1, [%o0 + (sun4u_i3 - sun4u_a3)] 767 768 call %l0 769 add %l1, (sun4u_a4 - sun4u_a1), %o0 770 771 /* Not reached */ 772 halt_me: 773 ld [%g7 + 0x74], %o0 774 call %o0 ! Get us out of here... 775 nop ! Apparently Solaris is better. 776 777 /* Ok, now we continue in the .data/.text sections */ 778 779 .data 780 .align 4 781 782 /* 783 * Fill up the prom vector, note in particular the kind first element, 784 * no joke. I don't need all of them in here as the entire prom vector 785 * gets initialized in c-code so all routines can use it. 786 */ 787 788 prom_vector_p: 789 .word 0 790 791 /* We calculate the following at boot time, window fills/spills and trap entry 792 * code uses these to keep track of the register windows. 793 */ 794 795 .align 4 796 .globl nwindows 797 .globl nwindowsm1 798 nwindows: 799 .word 8 800 nwindowsm1: 801 .word 7 802 803 /* Boot time debugger vector value. We need this later on. */ 804 805 .align 4 806 .globl linux_dbvec 807 linux_dbvec: 808 .word 0 809 .word 0 810 811 .align 8 812 813 .globl lvl14_save 814 lvl14_save: 815 .word 0 816 .word 0 817 .word 0 818 .word 0 819 .word t_irq14
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.