arch/sparc/kernel/entry.S

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   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* arch/sparc/kernel/entry.S:  Sparc trap low-level entry points.
   3  *
   4  * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
   5  * Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
   6  * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   7  * Copyright (C) 1996-1999 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
   8  * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
   9  */
  10 
  11 #include <linux/linkage.h>
  12 #include <linux/errno.h>
  13 
  14 #include <asm/head.h>
  15 #include <asm/asi.h>
  16 #include <asm/smp.h>
  17 #include <asm/contregs.h>
  18 #include <asm/ptrace.h>
  19 #include <asm/asm-offsets.h>
  20 #include <asm/psr.h>
  21 #include <asm/vaddrs.h>
  22 #include <asm/page.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/winmacro.h>
  25 #include <asm/signal.h>
  26 #include <asm/obio.h>
  27 #include <asm/mxcc.h>
  28 #include <asm/thread_info.h>
  29 #include <asm/param.h>
  30 #include <asm/unistd.h>
  31 
  32 #include <asm/asmmacro.h>
  33 #include <asm/export.h>
  34 
  35 #define curptr      g6
  36 
  37 /* These are just handy. */
  38 #define _SV     save    %sp, -STACKFRAME_SZ, %sp
  39 #define _RS     restore 
  40 
  41 #define FLUSH_ALL_KERNEL_WINDOWS \
  42         _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
  43         _RS; _RS; _RS; _RS; _RS; _RS; _RS;
  44 
  45         .text
  46 
  47 #ifdef CONFIG_KGDB
  48         .align  4
  49         .globl          arch_kgdb_breakpoint
  50         .type           arch_kgdb_breakpoint,#function
  51 arch_kgdb_breakpoint:
  52         ta              0x7d
  53         retl
  54          nop
  55         .size           arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
  56 #endif
  57 
  58 #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
  59         .align  4
  60         .globl  floppy_hardint
  61 floppy_hardint:
  62         /*
  63          * This code cannot touch registers %l0 %l1 and %l2
  64          * because SAVE_ALL depends on their values. It depends
  65          * on %l3 also, but we regenerate it before a call.
  66          * Other registers are:
  67          * %l3 -- base address of fdc registers
  68          * %l4 -- pdma_vaddr
  69          * %l5 -- scratch for ld/st address
  70          * %l6 -- pdma_size
  71          * %l7 -- scratch [floppy byte, ld/st address, aux. data]
  72          */
  73 
  74         /* Do we have work to do? */
  75         sethi   %hi(doing_pdma), %l7
  76         ld      [%l7 + %lo(doing_pdma)], %l7
  77         cmp     %l7, 0
  78         be      floppy_dosoftint
  79          nop
  80 
  81         /* Load fdc register base */
  82         sethi   %hi(fdc_status), %l3
  83         ld      [%l3 + %lo(fdc_status)], %l3
  84 
  85         /* Setup register addresses */
  86         sethi   %hi(pdma_vaddr), %l5    ! transfer buffer
  87         ld      [%l5 + %lo(pdma_vaddr)], %l4
  88         sethi   %hi(pdma_size), %l5     ! bytes to go
  89         ld      [%l5 + %lo(pdma_size)], %l6
  90 next_byte:
  91         ldub    [%l3], %l7
  92 
  93         andcc   %l7, 0x80, %g0          ! Does fifo still have data
  94         bz      floppy_fifo_emptied     ! fifo has been emptied...
  95          andcc  %l7, 0x20, %g0          ! in non-dma mode still?
  96         bz      floppy_overrun          ! nope, overrun
  97          andcc  %l7, 0x40, %g0          ! 0=write 1=read
  98         bz      floppy_write
  99          sub    %l6, 0x1, %l6
 100 
 101         /* Ok, actually read this byte */
 102         ldub    [%l3 + 1], %l7
 103         orcc    %g0, %l6, %g0
 104         stb     %l7, [%l4]
 105         bne     next_byte
 106          add    %l4, 0x1, %l4
 107 
 108         b       floppy_tdone
 109          nop
 110 
 111 floppy_write:
 112         /* Ok, actually write this byte */
 113         ldub    [%l4], %l7
 114         orcc    %g0, %l6, %g0
 115         stb     %l7, [%l3 + 1]
 116         bne     next_byte
 117          add    %l4, 0x1, %l4
 118 
 119         /* fall through... */
 120 floppy_tdone:
 121         sethi   %hi(pdma_vaddr), %l5
 122         st      %l4, [%l5 + %lo(pdma_vaddr)]
 123         sethi   %hi(pdma_size), %l5
 124         st      %l6, [%l5 + %lo(pdma_size)]
 125         /* Flip terminal count pin */
 126         set     auxio_register, %l7
 127         ld      [%l7], %l7
 128 
 129         ldub    [%l7], %l5
 130 
 131         or      %l5, 0xc2, %l5
 132         stb     %l5, [%l7]
 133         andn    %l5, 0x02, %l5
 134 
 135 2:
 136         /* Kill some time so the bits set */
 137         WRITE_PAUSE
 138         WRITE_PAUSE
 139 
 140         stb     %l5, [%l7]
 141 
 142         /* Prevent recursion */
 143         sethi   %hi(doing_pdma), %l7
 144         b       floppy_dosoftint
 145          st     %g0, [%l7 + %lo(doing_pdma)]
 146 
 147         /* We emptied the FIFO, but we haven't read everything
 148          * as of yet.  Store the current transfer address and
 149          * bytes left to read so we can continue when the next
 150          * fast IRQ comes in.
 151          */
 152 floppy_fifo_emptied:
 153         sethi   %hi(pdma_vaddr), %l5
 154         st      %l4, [%l5 + %lo(pdma_vaddr)]
 155         sethi   %hi(pdma_size), %l7
 156         st      %l6, [%l7 + %lo(pdma_size)]
 157 
 158         /* Restore condition codes */
 159         wr      %l0, 0x0, %psr
 160         WRITE_PAUSE
 161 
 162         jmp     %l1
 163         rett    %l2
 164 
 165 floppy_overrun:
 166         sethi   %hi(pdma_vaddr), %l5
 167         st      %l4, [%l5 + %lo(pdma_vaddr)]
 168         sethi   %hi(pdma_size), %l5
 169         st      %l6, [%l5 + %lo(pdma_size)]
 170         /* Prevent recursion */
 171         sethi   %hi(doing_pdma), %l7
 172         st      %g0, [%l7 + %lo(doing_pdma)]
 173 
 174         /* fall through... */
 175 floppy_dosoftint:
 176         rd      %wim, %l3
 177         SAVE_ALL
 178 
 179         /* Set all IRQs off. */
 180         or      %l0, PSR_PIL, %l4
 181         wr      %l4, 0x0, %psr
 182         WRITE_PAUSE
 183         wr      %l4, PSR_ET, %psr
 184         WRITE_PAUSE
 185 
 186         mov     11, %o0                 ! floppy irq level (unused anyway)
 187         mov     %g0, %o1                ! devid is not used in fast interrupts
 188         call    sparc_floppy_irq
 189          add    %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
 190 
 191         RESTORE_ALL
 192         
 193 #endif /* (CONFIG_BLK_DEV_FD) */
 194 
 195         /* Bad trap handler */
 196         .globl  bad_trap_handler
 197 bad_trap_handler:
 198         SAVE_ALL
 199 
 200         wr      %l0, PSR_ET, %psr
 201         WRITE_PAUSE
 202 
 203         add     %sp, STACKFRAME_SZ, %o0 ! pt_regs
 204         call    do_hw_interrupt
 205          mov    %l7, %o1                ! trap number
 206 
 207         RESTORE_ALL
 208         
 209 /* For now all IRQ's not registered get sent here. handler_irq() will
 210  * see if a routine is registered to handle this interrupt and if not
 211  * it will say so on the console.
 212  */
 213 
 214         .align  4
 215         .globl  real_irq_entry, patch_handler_irq
 216 real_irq_entry:
 217         SAVE_ALL
 218 
 219 #ifdef CONFIG_SMP
 220         .globl  patchme_maybe_smp_msg
 221 
 222         cmp     %l7, 11
 223 patchme_maybe_smp_msg:
 224         bgu     maybe_smp4m_msg
 225          nop
 226 #endif
 227 
 228 real_irq_continue:
 229         or      %l0, PSR_PIL, %g2
 230         wr      %g2, 0x0, %psr
 231         WRITE_PAUSE
 232         wr      %g2, PSR_ET, %psr
 233         WRITE_PAUSE
 234         mov     %l7, %o0                ! irq level
 235 patch_handler_irq:
 236         call    handler_irq
 237          add    %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
 238         or      %l0, PSR_PIL, %g2       ! restore PIL after handler_irq
 239         wr      %g2, PSR_ET, %psr       ! keep ET up
 240         WRITE_PAUSE
 241 
 242         RESTORE_ALL
 243 
 244 #ifdef CONFIG_SMP
 245         /* SMP per-cpu ticker interrupts are handled specially. */
 246 smp4m_ticker:
 247         bne     real_irq_continue+4
 248          or     %l0, PSR_PIL, %g2
 249         wr      %g2, 0x0, %psr
 250         WRITE_PAUSE
 251         wr      %g2, PSR_ET, %psr
 252         WRITE_PAUSE
 253         call    smp4m_percpu_timer_interrupt
 254          add    %sp, STACKFRAME_SZ, %o0
 255         wr      %l0, PSR_ET, %psr
 256         WRITE_PAUSE
 257         RESTORE_ALL
 258 
 259 #define GET_PROCESSOR4M_ID(reg) \
 260         rd      %tbr, %reg;     \
 261         srl     %reg, 12, %reg; \
 262         and     %reg, 3, %reg;
 263 
 264         /* Here is where we check for possible SMP IPI passed to us
 265          * on some level other than 15 which is the NMI and only used
 266          * for cross calls.  That has a separate entry point below.
 267          *
 268          * IPIs are sent on Level 12, 13 and 14. See IRQ_IPI_*.
 269          */
 270 maybe_smp4m_msg:
 271         GET_PROCESSOR4M_ID(o3)
 272         sethi   %hi(sun4m_irq_percpu), %l5
 273         sll     %o3, 2, %o3
 274         or      %l5, %lo(sun4m_irq_percpu), %o5
 275         sethi   %hi(0x70000000), %o2    ! Check all soft-IRQs
 276         ld      [%o5 + %o3], %o1
 277         ld      [%o1 + 0x00], %o3       ! sun4m_irq_percpu[cpu]->pending
 278         andcc   %o3, %o2, %g0
 279         be,a    smp4m_ticker
 280          cmp    %l7, 14
 281         /* Soft-IRQ IPI */
 282         st      %o2, [%o1 + 0x04]       ! sun4m_irq_percpu[cpu]->clear=0x70000000
 283         WRITE_PAUSE
 284         ld      [%o1 + 0x00], %g0       ! sun4m_irq_percpu[cpu]->pending
 285         WRITE_PAUSE
 286         or      %l0, PSR_PIL, %l4
 287         wr      %l4, 0x0, %psr
 288         WRITE_PAUSE
 289         wr      %l4, PSR_ET, %psr
 290         WRITE_PAUSE
 291         srl     %o3, 28, %o2            ! shift for simpler checks below
 292 maybe_smp4m_msg_check_single:
 293         andcc   %o2, 0x1, %g0
 294         beq,a   maybe_smp4m_msg_check_mask
 295          andcc  %o2, 0x2, %g0
 296         call    smp_call_function_single_interrupt
 297          nop
 298         andcc   %o2, 0x2, %g0
 299 maybe_smp4m_msg_check_mask:
 300         beq,a   maybe_smp4m_msg_check_resched
 301          andcc  %o2, 0x4, %g0
 302         call    smp_call_function_interrupt
 303          nop
 304         andcc   %o2, 0x4, %g0
 305 maybe_smp4m_msg_check_resched:
 306         /* rescheduling is done in RESTORE_ALL regardless, but incr stats */
 307         beq,a   maybe_smp4m_msg_out
 308          nop
 309         call    smp_resched_interrupt
 310          nop
 311 maybe_smp4m_msg_out:
 312         RESTORE_ALL
 313 
 314         .align  4
 315         .globl  linux_trap_ipi15_sun4m
 316 linux_trap_ipi15_sun4m:
 317         SAVE_ALL
 318         sethi   %hi(0x80000000), %o2
 319         GET_PROCESSOR4M_ID(o0)
 320         sethi   %hi(sun4m_irq_percpu), %l5
 321         or      %l5, %lo(sun4m_irq_percpu), %o5
 322         sll     %o0, 2, %o0
 323         ld      [%o5 + %o0], %o5
 324         ld      [%o5 + 0x00], %o3       ! sun4m_irq_percpu[cpu]->pending
 325         andcc   %o3, %o2, %g0
 326         be      sun4m_nmi_error         ! Must be an NMI async memory error
 327          st     %o2, [%o5 + 0x04]       ! sun4m_irq_percpu[cpu]->clear=0x80000000
 328         WRITE_PAUSE
 329         ld      [%o5 + 0x00], %g0       ! sun4m_irq_percpu[cpu]->pending
 330         WRITE_PAUSE
 331         or      %l0, PSR_PIL, %l4
 332         wr      %l4, 0x0, %psr
 333         WRITE_PAUSE
 334         wr      %l4, PSR_ET, %psr
 335         WRITE_PAUSE
 336         call    smp4m_cross_call_irq
 337          nop
 338         b       ret_trap_lockless_ipi
 339          clr    %l6
 340 
 341         .globl  smp4d_ticker
 342         /* SMP per-cpu ticker interrupts are handled specially. */
 343 smp4d_ticker:
 344         SAVE_ALL
 345         or      %l0, PSR_PIL, %g2
 346         sethi   %hi(CC_ICLR), %o0
 347         sethi   %hi(1 << 14), %o1
 348         or      %o0, %lo(CC_ICLR), %o0
 349         stha    %o1, [%o0] ASI_M_MXCC   /* Clear PIL 14 in MXCC's ICLR */
 350         wr      %g2, 0x0, %psr
 351         WRITE_PAUSE
 352         wr      %g2, PSR_ET, %psr
 353         WRITE_PAUSE
 354         call    smp4d_percpu_timer_interrupt
 355          add    %sp, STACKFRAME_SZ, %o0
 356         wr      %l0, PSR_ET, %psr
 357         WRITE_PAUSE
 358         RESTORE_ALL
 359 
 360         .align  4
 361         .globl  linux_trap_ipi15_sun4d
 362 linux_trap_ipi15_sun4d:
 363         SAVE_ALL
 364         sethi   %hi(CC_BASE), %o4
 365         sethi   %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
 366         or      %o4, (CC_EREG - CC_BASE), %o0
 367         ldda    [%o0] ASI_M_MXCC, %o0
 368         andcc   %o0, %o2, %g0
 369         bne     1f
 370          sethi  %hi(BB_STAT2), %o2
 371         lduba   [%o2] ASI_M_CTL, %o2
 372         andcc   %o2, BB_STAT2_MASK, %g0
 373         bne     2f
 374          or     %o4, (CC_ICLR - CC_BASE), %o0
 375         sethi   %hi(1 << 15), %o1
 376         stha    %o1, [%o0] ASI_M_MXCC   /* Clear PIL 15 in MXCC's ICLR */
 377         or      %l0, PSR_PIL, %l4
 378         wr      %l4, 0x0, %psr
 379         WRITE_PAUSE
 380         wr      %l4, PSR_ET, %psr
 381         WRITE_PAUSE
 382         call    smp4d_cross_call_irq
 383          nop
 384         b       ret_trap_lockless_ipi
 385          clr    %l6
 386 
 387 1:      /* MXCC error */
 388 2:      /* BB error */
 389         /* Disable PIL 15 */
 390         set     CC_IMSK, %l4
 391         lduha   [%l4] ASI_M_MXCC, %l5
 392         sethi   %hi(1 << 15), %l7
 393         or      %l5, %l7, %l5
 394         stha    %l5, [%l4] ASI_M_MXCC
 395         /* FIXME */
 396 1:      b,a     1b
 397 
 398         .globl  smpleon_ipi
 399         .extern leon_ipi_interrupt
 400         /* SMP per-cpu IPI interrupts are handled specially. */
 401 smpleon_ipi:
 402         SAVE_ALL
 403         or      %l0, PSR_PIL, %g2
 404         wr      %g2, 0x0, %psr
 405         WRITE_PAUSE
 406         wr      %g2, PSR_ET, %psr
 407         WRITE_PAUSE
 408         call    leonsmp_ipi_interrupt
 409          add    %sp, STACKFRAME_SZ, %o1 ! pt_regs
 410         wr      %l0, PSR_ET, %psr
 411         WRITE_PAUSE
 412         RESTORE_ALL
 413 
 414         .align  4
 415         .globl  linux_trap_ipi15_leon
 416 linux_trap_ipi15_leon:
 417         SAVE_ALL
 418         or      %l0, PSR_PIL, %l4
 419         wr      %l4, 0x0, %psr
 420         WRITE_PAUSE
 421         wr      %l4, PSR_ET, %psr
 422         WRITE_PAUSE
 423         call    leon_cross_call_irq
 424          nop
 425         b       ret_trap_lockless_ipi
 426          clr    %l6
 427 
 428 #endif /* CONFIG_SMP */
 429 
 430         /* This routine handles illegal instructions and privileged
 431          * instruction attempts from user code.
 432          */
 433         .align  4
 434         .globl  bad_instruction
 435 bad_instruction:
 436         sethi   %hi(0xc1f80000), %l4
 437         ld      [%l1], %l5
 438         sethi   %hi(0x81d80000), %l7
 439         and     %l5, %l4, %l5
 440         cmp     %l5, %l7
 441         be      1f
 442         SAVE_ALL
 443 
 444         wr      %l0, PSR_ET, %psr               ! re-enable traps
 445         WRITE_PAUSE
 446 
 447         add     %sp, STACKFRAME_SZ, %o0
 448         mov     %l1, %o1
 449         mov     %l2, %o2
 450         call    do_illegal_instruction
 451          mov    %l0, %o3
 452 
 453         RESTORE_ALL
 454 
 455 1:      /* unimplemented flush - just skip */
 456         jmpl    %l2, %g0
 457          rett   %l2 + 4
 458 
 459         .align  4
 460         .globl  priv_instruction
 461 priv_instruction:
 462         SAVE_ALL
 463 
 464         wr      %l0, PSR_ET, %psr
 465         WRITE_PAUSE
 466 
 467         add     %sp, STACKFRAME_SZ, %o0
 468         mov     %l1, %o1
 469         mov     %l2, %o2
 470         call    do_priv_instruction
 471          mov    %l0, %o3
 472 
 473         RESTORE_ALL
 474 
 475         /* This routine handles unaligned data accesses. */
 476         .align  4
 477         .globl  mna_handler
 478 mna_handler:
 479         andcc   %l0, PSR_PS, %g0
 480         be      mna_fromuser
 481          nop
 482 
 483         SAVE_ALL
 484 
 485         wr      %l0, PSR_ET, %psr
 486         WRITE_PAUSE
 487 
 488         ld      [%l1], %o1
 489         call    kernel_unaligned_trap
 490          add    %sp, STACKFRAME_SZ, %o0
 491 
 492         RESTORE_ALL
 493 
 494 mna_fromuser:
 495         SAVE_ALL
 496 
 497         wr      %l0, PSR_ET, %psr               ! re-enable traps
 498         WRITE_PAUSE
 499 
 500         ld      [%l1], %o1
 501         call    user_unaligned_trap
 502          add    %sp, STACKFRAME_SZ, %o0
 503 
 504         RESTORE_ALL
 505 
 506         /* This routine handles floating point disabled traps. */
 507         .align  4
 508         .globl  fpd_trap_handler
 509 fpd_trap_handler:
 510         SAVE_ALL
 511 
 512         wr      %l0, PSR_ET, %psr               ! re-enable traps
 513         WRITE_PAUSE
 514 
 515         add     %sp, STACKFRAME_SZ, %o0
 516         mov     %l1, %o1
 517         mov     %l2, %o2
 518         call    do_fpd_trap
 519          mov    %l0, %o3
 520 
 521         RESTORE_ALL
 522 
 523         /* This routine handles Floating Point Exceptions. */
 524         .align  4
 525         .globl  fpe_trap_handler
 526 fpe_trap_handler:
 527         set     fpsave_magic, %l5
 528         cmp     %l1, %l5
 529         be      1f
 530          sethi  %hi(fpsave), %l5
 531         or      %l5, %lo(fpsave), %l5
 532         cmp     %l1, %l5
 533         bne     2f
 534          sethi  %hi(fpsave_catch2), %l5
 535         or      %l5, %lo(fpsave_catch2), %l5
 536         wr      %l0, 0x0, %psr
 537         WRITE_PAUSE
 538         jmp     %l5
 539          rett   %l5 + 4
 540 1:      
 541         sethi   %hi(fpsave_catch), %l5
 542         or      %l5, %lo(fpsave_catch), %l5
 543         wr      %l0, 0x0, %psr
 544         WRITE_PAUSE
 545         jmp     %l5
 546          rett   %l5 + 4
 547 
 548 2:
 549         SAVE_ALL
 550 
 551         wr      %l0, PSR_ET, %psr               ! re-enable traps
 552         WRITE_PAUSE
 553 
 554         add     %sp, STACKFRAME_SZ, %o0
 555         mov     %l1, %o1
 556         mov     %l2, %o2
 557         call    do_fpe_trap
 558          mov    %l0, %o3
 559 
 560         RESTORE_ALL
 561 
 562         /* This routine handles Tag Overflow Exceptions. */
 563         .align  4
 564         .globl  do_tag_overflow
 565 do_tag_overflow:
 566         SAVE_ALL
 567 
 568         wr      %l0, PSR_ET, %psr               ! re-enable traps
 569         WRITE_PAUSE
 570 
 571         add     %sp, STACKFRAME_SZ, %o0
 572         mov     %l1, %o1
 573         mov     %l2, %o2
 574         call    handle_tag_overflow
 575          mov    %l0, %o3
 576 
 577         RESTORE_ALL
 578 
 579         /* This routine handles Watchpoint Exceptions. */
 580         .align  4
 581         .globl  do_watchpoint
 582 do_watchpoint:
 583         SAVE_ALL
 584 
 585         wr      %l0, PSR_ET, %psr               ! re-enable traps
 586         WRITE_PAUSE
 587 
 588         add     %sp, STACKFRAME_SZ, %o0
 589         mov     %l1, %o1
 590         mov     %l2, %o2
 591         call    handle_watchpoint
 592          mov    %l0, %o3
 593 
 594         RESTORE_ALL
 595 
 596         /* This routine handles Register Access Exceptions. */
 597         .align  4
 598         .globl  do_reg_access
 599 do_reg_access:
 600         SAVE_ALL
 601 
 602         wr      %l0, PSR_ET, %psr               ! re-enable traps
 603         WRITE_PAUSE
 604 
 605         add     %sp, STACKFRAME_SZ, %o0
 606         mov     %l1, %o1
 607         mov     %l2, %o2
 608         call    handle_reg_access
 609          mov    %l0, %o3
 610 
 611         RESTORE_ALL
 612 
 613         /* This routine handles Co-Processor Disabled Exceptions. */
 614         .align  4
 615         .globl  do_cp_disabled
 616 do_cp_disabled:
 617         SAVE_ALL
 618 
 619         wr      %l0, PSR_ET, %psr               ! re-enable traps
 620         WRITE_PAUSE
 621 
 622         add     %sp, STACKFRAME_SZ, %o0
 623         mov     %l1, %o1
 624         mov     %l2, %o2
 625         call    handle_cp_disabled
 626          mov    %l0, %o3
 627 
 628         RESTORE_ALL
 629 
 630         /* This routine handles Co-Processor Exceptions. */
 631         .align  4
 632         .globl  do_cp_exception
 633 do_cp_exception:
 634         SAVE_ALL
 635 
 636         wr      %l0, PSR_ET, %psr               ! re-enable traps
 637         WRITE_PAUSE
 638 
 639         add     %sp, STACKFRAME_SZ, %o0
 640         mov     %l1, %o1
 641         mov     %l2, %o2
 642         call    handle_cp_exception
 643          mov    %l0, %o3
 644 
 645         RESTORE_ALL
 646 
 647         /* This routine handles Hardware Divide By Zero Exceptions. */
 648         .align  4
 649         .globl  do_hw_divzero
 650 do_hw_divzero:
 651         SAVE_ALL
 652 
 653         wr      %l0, PSR_ET, %psr               ! re-enable traps
 654         WRITE_PAUSE
 655 
 656         add     %sp, STACKFRAME_SZ, %o0
 657         mov     %l1, %o1
 658         mov     %l2, %o2
 659         call    handle_hw_divzero
 660          mov    %l0, %o3
 661 
 662         RESTORE_ALL
 663 
 664         .align  4
 665         .globl  do_flush_windows
 666 do_flush_windows:
 667         SAVE_ALL
 668 
 669         wr      %l0, PSR_ET, %psr
 670         WRITE_PAUSE
 671 
 672         andcc   %l0, PSR_PS, %g0
 673         bne     dfw_kernel
 674          nop
 675 
 676         call    flush_user_windows
 677          nop
 678 
 679         /* Advance over the trap instruction. */
 680         ld      [%sp + STACKFRAME_SZ + PT_NPC], %l1
 681         add     %l1, 0x4, %l2
 682         st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
 683         st      %l2, [%sp + STACKFRAME_SZ + PT_NPC]
 684 
 685         RESTORE_ALL
 686 
 687         .globl  flush_patch_one
 688 
 689         /* We get these for debugging routines using __builtin_return_address() */
 690 dfw_kernel:
 691 flush_patch_one:
 692         FLUSH_ALL_KERNEL_WINDOWS
 693 
 694         /* Advance over the trap instruction. */
 695         ld      [%sp + STACKFRAME_SZ + PT_NPC], %l1
 696         add     %l1, 0x4, %l2
 697         st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
 698         st      %l2, [%sp + STACKFRAME_SZ + PT_NPC]
 699 
 700         RESTORE_ALL
 701 
 702         /* The getcc software trap.  The user wants the condition codes from
 703          * the %psr in register %g1.
 704          */
 705 
 706         .align  4
 707         .globl  getcc_trap_handler
 708 getcc_trap_handler:
 709         srl     %l0, 20, %g1    ! give user
 710         and     %g1, 0xf, %g1   ! only ICC bits in %psr
 711         jmp     %l2             ! advance over trap instruction
 712         rett    %l2 + 0x4       ! like this...
 713 
 714         /* The setcc software trap.  The user has condition codes in %g1
 715          * that it would like placed in the %psr.  Be careful not to flip
 716          * any unintentional bits!
 717          */
 718 
 719         .align  4
 720         .globl  setcc_trap_handler
 721 setcc_trap_handler:
 722         sll     %g1, 0x14, %l4
 723         set     PSR_ICC, %l5
 724         andn    %l0, %l5, %l0   ! clear ICC bits in %psr
 725         and     %l4, %l5, %l4   ! clear non-ICC bits in user value
 726         or      %l4, %l0, %l4   ! or them in... mix mix mix
 727 
 728         wr      %l4, 0x0, %psr  ! set new %psr
 729         WRITE_PAUSE             ! TI scumbags...
 730 
 731         jmp     %l2             ! advance over trap instruction
 732         rett    %l2 + 0x4       ! like this...
 733 
 734 sun4m_nmi_error:
 735         /* NMI async memory error handling. */
 736         sethi   %hi(0x80000000), %l4
 737         sethi   %hi(sun4m_irq_global), %o5
 738         ld      [%o5 + %lo(sun4m_irq_global)], %l5
 739         st      %l4, [%l5 + 0x0c]       ! sun4m_irq_global->mask_set=0x80000000
 740         WRITE_PAUSE
 741         ld      [%l5 + 0x00], %g0       ! sun4m_irq_global->pending
 742         WRITE_PAUSE
 743         or      %l0, PSR_PIL, %l4
 744         wr      %l4, 0x0, %psr
 745         WRITE_PAUSE
 746         wr      %l4, PSR_ET, %psr
 747         WRITE_PAUSE
 748         call    sun4m_nmi
 749          nop
 750         st      %l4, [%l5 + 0x08]       ! sun4m_irq_global->mask_clear=0x80000000
 751         WRITE_PAUSE
 752         ld      [%l5 + 0x00], %g0       ! sun4m_irq_global->pending
 753         WRITE_PAUSE
 754         RESTORE_ALL
 755 
 756 #ifndef CONFIG_SMP
 757         .align  4
 758         .globl  linux_trap_ipi15_sun4m
 759 linux_trap_ipi15_sun4m:
 760         SAVE_ALL
 761 
 762         ba      sun4m_nmi_error
 763          nop
 764 #endif /* CONFIG_SMP */
 765 
 766         .align  4
 767         .globl  srmmu_fault
 768 srmmu_fault:
 769         mov     0x400, %l5
 770         mov     0x300, %l4
 771 
 772 LEON_PI(lda     [%l5] ASI_LEON_MMUREGS, %l6)    ! read sfar first
 773 SUN_PI_(lda     [%l5] ASI_M_MMUREGS, %l6)       ! read sfar first
 774 
 775 LEON_PI(lda     [%l4] ASI_LEON_MMUREGS, %l5)    ! read sfsr last
 776 SUN_PI_(lda     [%l4] ASI_M_MMUREGS, %l5)       ! read sfsr last
 777 
 778         andn    %l6, 0xfff, %l6
 779         srl     %l5, 6, %l5                     ! and encode all info into l7
 780 
 781         and     %l5, 2, %l5
 782         or      %l5, %l6, %l6
 783 
 784         or      %l6, %l7, %l7                   ! l7 = [addr,write,txtfault]
 785 
 786         SAVE_ALL
 787 
 788         mov     %l7, %o1
 789         mov     %l7, %o2
 790         and     %o1, 1, %o1             ! arg2 = text_faultp
 791         mov     %l7, %o3
 792         and     %o2, 2, %o2             ! arg3 = writep
 793         andn    %o3, 0xfff, %o3         ! arg4 = faulting address
 794 
 795         wr      %l0, PSR_ET, %psr
 796         WRITE_PAUSE
 797 
 798         call    do_sparc_fault
 799          add    %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
 800 
 801         RESTORE_ALL
 802 
 803         .align  4
 804 sunos_execv:
 805         .globl  sunos_execv
 806         b       sys_execve
 807          clr    %i2
 808 
 809         .align  4
 810         .globl  sys_sigstack
 811 sys_sigstack:
 812         mov     %o7, %l5
 813         mov     %fp, %o2
 814         call    do_sys_sigstack
 815          mov    %l5, %o7
 816 
 817         .align  4
 818         .globl  sys_sigreturn
 819 sys_sigreturn:
 820         call    do_sigreturn
 821          add    %sp, STACKFRAME_SZ, %o0
 822 
 823         ld      [%curptr + TI_FLAGS], %l5
 824         andcc   %l5, _TIF_SYSCALL_TRACE, %g0
 825         be      1f
 826          nop
 827 
 828         call    syscall_trace
 829          mov    1, %o1
 830 
 831 1:
 832         /* We don't want to muck with user registers like a
 833          * normal syscall, just return.
 834          */
 835         RESTORE_ALL
 836 
 837         .align  4
 838         .globl  sys_rt_sigreturn
 839 sys_rt_sigreturn:
 840         call    do_rt_sigreturn
 841          add    %sp, STACKFRAME_SZ, %o0
 842 
 843         ld      [%curptr + TI_FLAGS], %l5
 844         andcc   %l5, _TIF_SYSCALL_TRACE, %g0
 845         be      1f
 846          nop
 847 
 848         add     %sp, STACKFRAME_SZ, %o0
 849         call    syscall_trace
 850          mov    1, %o1
 851 
 852 1:
 853         /* We are returning to a signal handler. */
 854         RESTORE_ALL
 855 
 856         /* Now that we have a real sys_clone, sys_fork() is
 857          * implemented in terms of it.  Our _real_ implementation
 858          * of SunOS vfork() will use sys_vfork().
 859          *
 860          * XXX These three should be consolidated into mostly shared
 861          * XXX code just like on sparc64... -DaveM
 862          */
 863         .align  4
 864         .globl  sys_fork, flush_patch_two
 865 sys_fork:
 866         mov     %o7, %l5
 867 flush_patch_two:
 868         FLUSH_ALL_KERNEL_WINDOWS;
 869         ld      [%curptr + TI_TASK], %o4
 870         rd      %psr, %g4
 871         WRITE_PAUSE
 872         mov     SIGCHLD, %o0                    ! arg0: clone flags
 873         rd      %wim, %g5
 874         WRITE_PAUSE
 875         mov     %fp, %o1                        ! arg1: usp
 876         std     %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
 877         add     %sp, STACKFRAME_SZ, %o2         ! arg2: pt_regs ptr
 878         mov     0, %o3
 879         call    sparc_do_fork
 880          mov    %l5, %o7
 881 
 882         /* Whee, kernel threads! */
 883         .globl  sys_clone, flush_patch_three
 884 sys_clone:
 885         mov     %o7, %l5
 886 flush_patch_three:
 887         FLUSH_ALL_KERNEL_WINDOWS;
 888         ld      [%curptr + TI_TASK], %o4
 889         rd      %psr, %g4
 890         WRITE_PAUSE
 891 
 892         /* arg0,1: flags,usp  -- loaded already */
 893         cmp     %o1, 0x0                        ! Is new_usp NULL?
 894         rd      %wim, %g5
 895         WRITE_PAUSE
 896         be,a    1f
 897          mov    %fp, %o1                        ! yes, use callers usp
 898         andn    %o1, 7, %o1                     ! no, align to 8 bytes
 899 1:
 900         std     %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
 901         add     %sp, STACKFRAME_SZ, %o2         ! arg2: pt_regs ptr
 902         mov     0, %o3
 903         call    sparc_do_fork
 904          mov    %l5, %o7
 905 
 906         /* Whee, real vfork! */
 907         .globl  sys_vfork, flush_patch_four
 908 sys_vfork:
 909 flush_patch_four:
 910         FLUSH_ALL_KERNEL_WINDOWS;
 911         ld      [%curptr + TI_TASK], %o4
 912         rd      %psr, %g4
 913         WRITE_PAUSE
 914         rd      %wim, %g5
 915         WRITE_PAUSE
 916         std     %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
 917         sethi   %hi(0x4000 | 0x0100 | SIGCHLD), %o0
 918         mov     %fp, %o1
 919         or      %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
 920         sethi   %hi(sparc_do_fork), %l1
 921         mov     0, %o3
 922         jmpl    %l1 + %lo(sparc_do_fork), %g0
 923          add    %sp, STACKFRAME_SZ, %o2
 924 
 925         .align  4
 926 linux_sparc_ni_syscall:
 927         sethi   %hi(sys_ni_syscall), %l7
 928         b       do_syscall
 929          or     %l7, %lo(sys_ni_syscall), %l7
 930 
 931 linux_syscall_trace:
 932         add     %sp, STACKFRAME_SZ, %o0
 933         call    syscall_trace
 934          mov    0, %o1
 935         cmp     %o0, 0
 936         bne     3f
 937          mov    -ENOSYS, %o0
 938 
 939         /* Syscall tracing can modify the registers.  */
 940         ld      [%sp + STACKFRAME_SZ + PT_G1], %g1
 941         sethi   %hi(sys_call_table), %l7
 942         ld      [%sp + STACKFRAME_SZ + PT_I0], %i0
 943         or      %l7, %lo(sys_call_table), %l7
 944         ld      [%sp + STACKFRAME_SZ + PT_I1], %i1
 945         ld      [%sp + STACKFRAME_SZ + PT_I2], %i2
 946         ld      [%sp + STACKFRAME_SZ + PT_I3], %i3
 947         ld      [%sp + STACKFRAME_SZ + PT_I4], %i4
 948         ld      [%sp + STACKFRAME_SZ + PT_I5], %i5
 949         cmp     %g1, NR_syscalls
 950         bgeu    3f
 951          mov    -ENOSYS, %o0
 952 
 953         sll     %g1, 2, %l4
 954         mov     %i0, %o0
 955         ld      [%l7 + %l4], %l7
 956         mov     %i1, %o1
 957         mov     %i2, %o2
 958         mov     %i3, %o3
 959         b       2f
 960          mov    %i4, %o4
 961 
 962         .globl  ret_from_fork
 963 ret_from_fork:
 964         call    schedule_tail
 965          ld     [%g3 + TI_TASK], %o0
 966         b       ret_sys_call
 967          ld     [%sp + STACKFRAME_SZ + PT_I0], %o0
 968 
 969         .globl  ret_from_kernel_thread
 970 ret_from_kernel_thread:
 971         call    schedule_tail
 972          ld     [%g3 + TI_TASK], %o0
 973         ld      [%sp + STACKFRAME_SZ + PT_G1], %l0
 974         call    %l0
 975          ld     [%sp + STACKFRAME_SZ + PT_G2], %o0
 976         rd      %psr, %l1
 977         ld      [%sp + STACKFRAME_SZ + PT_PSR], %l0
 978         andn    %l0, PSR_CWP, %l0
 979         nop
 980         and     %l1, PSR_CWP, %l1
 981         or      %l0, %l1, %l0
 982         st      %l0, [%sp + STACKFRAME_SZ + PT_PSR]
 983         b       ret_sys_call
 984          mov    0, %o0
 985 
 986         /* Linux native system calls enter here... */
 987         .align  4
 988         .globl  linux_sparc_syscall
 989 linux_sparc_syscall:
 990         sethi   %hi(PSR_SYSCALL), %l4
 991         or      %l0, %l4, %l0
 992         /* Direct access to user regs, must faster. */
 993         cmp     %g1, NR_syscalls
 994         bgeu    linux_sparc_ni_syscall
 995          sll    %g1, 2, %l4
 996         ld      [%l7 + %l4], %l7
 997 
 998 do_syscall:
 999         SAVE_ALL_HEAD
1000          rd     %wim, %l3
1001 
1002         wr      %l0, PSR_ET, %psr
1003         mov     %i0, %o0
1004         mov     %i1, %o1
1005         mov     %i2, %o2
1006 
1007         ld      [%curptr + TI_FLAGS], %l5
1008         mov     %i3, %o3
1009         andcc   %l5, _TIF_SYSCALL_TRACE, %g0
1010         mov     %i4, %o4
1011         bne     linux_syscall_trace
1012          mov    %i0, %l5
1013 2:
1014         call    %l7
1015          mov    %i5, %o5
1016 
1017 3:
1018         st      %o0, [%sp + STACKFRAME_SZ + PT_I0]
1019 
1020 ret_sys_call:
1021         ld      [%curptr + TI_FLAGS], %l6
1022         cmp     %o0, -ERESTART_RESTARTBLOCK
1023         ld      [%sp + STACKFRAME_SZ + PT_PSR], %g3
1024         set     PSR_C, %g2
1025         bgeu    1f
1026          andcc  %l6, _TIF_SYSCALL_TRACE, %g0
1027 
1028         /* System call success, clear Carry condition code. */
1029         andn    %g3, %g2, %g3
1030         clr     %l6
1031         st      %g3, [%sp + STACKFRAME_SZ + PT_PSR]     
1032         bne     linux_syscall_trace2
1033          ld     [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1034         add     %l1, 0x4, %l2                   /* npc = npc+4 */
1035         st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
1036         b       ret_trap_entry
1037          st     %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1038 1:
1039         /* System call failure, set Carry condition code.
1040          * Also, get abs(errno) to return to the process.
1041          */
1042         sub     %g0, %o0, %o0
1043         or      %g3, %g2, %g3
1044         st      %o0, [%sp + STACKFRAME_SZ + PT_I0]
1045         mov     1, %l6
1046         st      %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1047         bne     linux_syscall_trace2
1048          ld     [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1049         add     %l1, 0x4, %l2                   /* npc = npc+4 */
1050         st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
1051         b       ret_trap_entry
1052          st     %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1053 
1054 linux_syscall_trace2:
1055         add     %sp, STACKFRAME_SZ, %o0
1056         mov     1, %o1
1057         call    syscall_trace
1058          add    %l1, 0x4, %l2                   /* npc = npc+4 */
1059         st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
1060         b       ret_trap_entry
1061          st     %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1062 
1063 
1064 /* Saving and restoring the FPU state is best done from lowlevel code.
1065  *
1066  * void fpsave(unsigned long *fpregs, unsigned long *fsr,
1067  *             void *fpqueue, unsigned long *fpqdepth)
1068  */
1069 
1070         .globl  fpsave
1071 fpsave:
1072         st      %fsr, [%o1]     ! this can trap on us if fpu is in bogon state
1073         ld      [%o1], %g1
1074         set     0x2000, %g4
1075         andcc   %g1, %g4, %g0
1076         be      2f
1077          mov    0, %g2
1078 
1079         /* We have an fpqueue to save. */
1080 1:
1081         std     %fq, [%o2]
1082 fpsave_magic:
1083         st      %fsr, [%o1]
1084         ld      [%o1], %g3
1085         andcc   %g3, %g4, %g0
1086         add     %g2, 1, %g2
1087         bne     1b
1088          add    %o2, 8, %o2
1089 
1090 2:
1091         st      %g2, [%o3]
1092 
1093         std     %f0, [%o0 + 0x00]
1094         std     %f2, [%o0 + 0x08]
1095         std     %f4, [%o0 + 0x10]
1096         std     %f6, [%o0 + 0x18]
1097         std     %f8, [%o0 + 0x20]
1098         std     %f10, [%o0 + 0x28]
1099         std     %f12, [%o0 + 0x30]
1100         std     %f14, [%o0 + 0x38]
1101         std     %f16, [%o0 + 0x40]
1102         std     %f18, [%o0 + 0x48]
1103         std     %f20, [%o0 + 0x50]
1104         std     %f22, [%o0 + 0x58]
1105         std     %f24, [%o0 + 0x60]
1106         std     %f26, [%o0 + 0x68]
1107         std     %f28, [%o0 + 0x70]
1108         retl
1109          std    %f30, [%o0 + 0x78]
1110 
1111         /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
1112          * code for pointing out this possible deadlock, while we save state
1113          * above we could trap on the fsr store so our low level fpu trap
1114          * code has to know how to deal with this.
1115          */
1116 fpsave_catch:
1117         b       fpsave_magic + 4
1118          st     %fsr, [%o1]
1119 
1120 fpsave_catch2:
1121         b       fpsave + 4
1122          st     %fsr, [%o1]
1123 
1124         /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
1125 
1126         .globl  fpload
1127 fpload:
1128         ldd     [%o0 + 0x00], %f0
1129         ldd     [%o0 + 0x08], %f2
1130         ldd     [%o0 + 0x10], %f4
1131         ldd     [%o0 + 0x18], %f6
1132         ldd     [%o0 + 0x20], %f8
1133         ldd     [%o0 + 0x28], %f10
1134         ldd     [%o0 + 0x30], %f12
1135         ldd     [%o0 + 0x38], %f14
1136         ldd     [%o0 + 0x40], %f16
1137         ldd     [%o0 + 0x48], %f18
1138         ldd     [%o0 + 0x50], %f20
1139         ldd     [%o0 + 0x58], %f22
1140         ldd     [%o0 + 0x60], %f24
1141         ldd     [%o0 + 0x68], %f26
1142         ldd     [%o0 + 0x70], %f28
1143         ldd     [%o0 + 0x78], %f30
1144         ld      [%o1], %fsr
1145         retl
1146          nop
1147 
1148         /* __ndelay and __udelay take two arguments:
1149          * 0 - nsecs or usecs to delay
1150          * 1 - per_cpu udelay_val (loops per jiffy)
1151          *
1152          * Note that ndelay gives HZ times higher resolution but has a 10ms
1153          * limit.  udelay can handle up to 1s.
1154          */
1155         .globl  __ndelay
1156 __ndelay:
1157         save    %sp, -STACKFRAME_SZ, %sp
1158         mov     %i0, %o0                ! round multiplier up so large ns ok
1159         mov     0x1ae, %o1              ! 2**32 / (1 000 000 000 / HZ)
1160         umul    %o0, %o1, %o0
1161         rd      %y, %o1
1162         mov     %i1, %o1                ! udelay_val
1163         umul    %o0, %o1, %o0
1164         rd      %y, %o1
1165         ba      delay_continue
1166          mov    %o1, %o0                ! >>32 later for better resolution
1167 
1168         .globl  __udelay
1169 __udelay:
1170         save    %sp, -STACKFRAME_SZ, %sp
1171         mov     %i0, %o0
1172         sethi   %hi(0x10c7), %o1        ! round multiplier up so large us ok
1173         or      %o1, %lo(0x10c7), %o1   ! 2**32 / 1 000 000
1174         umul    %o0, %o1, %o0
1175         rd      %y, %o1
1176         mov     %i1, %o1                ! udelay_val
1177         umul    %o0, %o1, %o0
1178         rd      %y, %o1
1179         sethi   %hi(0x028f4b62), %l0    ! Add in rounding constant * 2**32,
1180         or      %g0, %lo(0x028f4b62), %l0
1181         addcc   %o0, %l0, %o0           ! 2**32 * 0.009 999
1182         bcs,a   3f
1183          add    %o1, 0x01, %o1
1184 3:
1185         mov     HZ, %o0                 ! >>32 earlier for wider range
1186         umul    %o0, %o1, %o0
1187         rd      %y, %o1
1188 
1189 delay_continue:
1190         cmp     %o0, 0x0
1191 1:
1192         bne     1b
1193          subcc  %o0, 1, %o0
1194         
1195         ret
1196         restore
1197 EXPORT_SYMBOL(__udelay)
1198 EXPORT_SYMBOL(__ndelay)
1199 
1200         /* Handle a software breakpoint */
1201         /* We have to inform parent that child has stopped */
1202         .align 4
1203         .globl breakpoint_trap
1204 breakpoint_trap:
1205         rd      %wim,%l3
1206         SAVE_ALL
1207         wr      %l0, PSR_ET, %psr
1208         WRITE_PAUSE
1209 
1210         st      %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
1211         call    sparc_breakpoint
1212          add    %sp, STACKFRAME_SZ, %o0
1213 
1214         RESTORE_ALL
1215 
1216 #ifdef CONFIG_KGDB
1217         ENTRY(kgdb_trap_low)
1218         rd      %wim,%l3
1219         SAVE_ALL
1220         wr      %l0, PSR_ET, %psr
1221         WRITE_PAUSE
1222 
1223         mov     %l7, %o0                ! trap_level
1224         call    kgdb_trap
1225          add    %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
1226 
1227         RESTORE_ALL
1228         ENDPROC(kgdb_trap_low)
1229 #endif
1230 
1231         .align  4
1232         .globl  flush_patch_exception
1233 flush_patch_exception:
1234         FLUSH_ALL_KERNEL_WINDOWS;
1235         ldd     [%o0], %o6
1236         jmpl    %o7 + 0xc, %g0                  ! see asm-sparc/processor.h
1237          mov    1, %g1                          ! signal EFAULT condition
1238 
1239         .align  4
1240         .globl  kill_user_windows, kuw_patch1_7win
1241         .globl  kuw_patch1
1242 kuw_patch1_7win:        sll     %o3, 6, %o3
1243 
1244         /* No matter how much overhead this routine has in the worst
1245          * case scenario, it is several times better than taking the
1246          * traps with the old method of just doing flush_user_windows().
1247          */
1248 kill_user_windows:
1249         ld      [%g6 + TI_UWINMASK], %o0        ! get current umask
1250         orcc    %g0, %o0, %g0                   ! if no bits set, we are done
1251         be      3f                              ! nothing to do
1252          rd     %psr, %o5                       ! must clear interrupts
1253         or      %o5, PSR_PIL, %o4               ! or else that could change
1254         wr      %o4, 0x0, %psr                  ! the uwinmask state
1255         WRITE_PAUSE                             ! burn them cycles
1256 1:
1257         ld      [%g6 + TI_UWINMASK], %o0        ! get consistent state
1258         orcc    %g0, %o0, %g0                   ! did an interrupt come in?
1259         be      4f                              ! yep, we are done
1260          rd     %wim, %o3                       ! get current wim
1261         srl     %o3, 1, %o4                     ! simulate a save
1262 kuw_patch1:
1263         sll     %o3, 7, %o3                     ! compute next wim
1264         or      %o4, %o3, %o3                   ! result
1265         andncc  %o0, %o3, %o0                   ! clean this bit in umask
1266         bne     kuw_patch1                      ! not done yet
1267          srl    %o3, 1, %o4                     ! begin another save simulation
1268         wr      %o3, 0x0, %wim                  ! set the new wim
1269         st      %g0, [%g6 + TI_UWINMASK]        ! clear uwinmask
1270 4:
1271         wr      %o5, 0x0, %psr                  ! re-enable interrupts
1272         WRITE_PAUSE                             ! burn baby burn
1273 3:
1274         retl                                    ! return
1275          st     %g0, [%g6 + TI_W_SAVED]         ! no windows saved
1276 
1277         .align  4
1278         .globl  restore_current
1279 restore_current:
1280         LOAD_CURRENT(g6, o0)
1281         retl
1282          nop
1283 
1284 #ifdef CONFIG_PCIC_PCI
1285 #include <asm/pcic.h>
1286 
1287         .align  4
1288         .globl  linux_trap_ipi15_pcic
1289 linux_trap_ipi15_pcic:
1290         rd      %wim, %l3
1291         SAVE_ALL
1292 
1293         /*
1294          * First deactivate NMI
1295          * or we cannot drop ET, cannot get window spill traps.
1296          * The busy loop is necessary because the PIO error
1297          * sometimes does not go away quickly and we trap again.
1298          */
1299         sethi   %hi(pcic_regs), %o1
1300         ld      [%o1 + %lo(pcic_regs)], %o2
1301 
1302         ! Get pending status for printouts later.
1303         ld      [%o2 + PCI_SYS_INT_PENDING], %o0
1304 
1305         mov     PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
1306         stb     %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
1307 1:
1308         ld      [%o2 + PCI_SYS_INT_PENDING], %o1
1309         andcc   %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
1310         bne     1b
1311          nop
1312 
1313         or      %l0, PSR_PIL, %l4
1314         wr      %l4, 0x0, %psr
1315         WRITE_PAUSE
1316         wr      %l4, PSR_ET, %psr
1317         WRITE_PAUSE
1318 
1319         call    pcic_nmi
1320          add    %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
1321         RESTORE_ALL
1322 
1323         .globl  pcic_nmi_trap_patch
1324 pcic_nmi_trap_patch:
1325         sethi   %hi(linux_trap_ipi15_pcic), %l3
1326         jmpl    %l3 + %lo(linux_trap_ipi15_pcic), %g0
1327          rd     %psr, %l0
1328         .word   0
1329 
1330 #endif /* CONFIG_PCIC_PCI */
1331 
1332         .globl  flushw_all
1333 flushw_all:
1334         save    %sp, -0x40, %sp
1335         save    %sp, -0x40, %sp
1336         save    %sp, -0x40, %sp
1337         save    %sp, -0x40, %sp
1338         save    %sp, -0x40, %sp
1339         save    %sp, -0x40, %sp
1340         save    %sp, -0x40, %sp
1341         restore
1342         restore
1343         restore
1344         restore
1345         restore
1346         restore
1347         ret
1348          restore
1349 
1350 #ifdef CONFIG_SMP
1351 ENTRY(hard_smp_processor_id)
1352 661:    rd              %tbr, %g1
1353         srl             %g1, 12, %o0
1354         and             %o0, 3, %o0
1355         .section        .cpuid_patch, "ax"
1356         /* Instruction location. */
1357         .word           661b
1358         /* SUN4D implementation. */
1359         lda             [%g0] ASI_M_VIKING_TMP1, %o0
1360         nop
1361         nop
1362         /* LEON implementation. */
1363         rd              %asr17, %o0
1364         srl             %o0, 0x1c, %o0
1365         nop
1366         .previous
1367         retl
1368          nop
1369 ENDPROC(hard_smp_processor_id)
1370 #endif
1371 
1372 /* End of entry.S */
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root/arch/sparc/kernel/entry.S
