LXR linux/arch/sparc/kernel/entry.S

   1/* arch/sparc/kernel/entry.S:  Sparc trap low-level entry points.
   2 *
   3 * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
   4 * Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
   5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   6 * Copyright (C) 1996-1999 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
   7 * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
   8 */
   9
  10#include <linux/linkage.h>
  11#include <linux/errno.h>
  12
  13#include <asm/head.h>
  14#include <asm/asi.h>
  15#include <asm/smp.h>
  16#include <asm/contregs.h>
  17#include <asm/ptrace.h>
  18#include <asm/asm-offsets.h>
  19#include <asm/psr.h>
  20#include <asm/vaddrs.h>
  21#include <asm/page.h>
  22#include <asm/pgtable.h>
  23#include <asm/winmacro.h>
  24#include <asm/signal.h>
  25#include <asm/obio.h>
  26#include <asm/mxcc.h>
  27#include <asm/thread_info.h>
  28#include <asm/param.h>
  29#include <asm/unistd.h>
  30
  31#include <asm/asmmacro.h>
  32
  33#define curptr      g6
  34
  35/* These are just handy. */
  36#define _SV     save    %sp, -STACKFRAME_SZ, %sp
  37#define _RS     restore 
  38
  39#define FLUSH_ALL_KERNEL_WINDOWS \
  40        _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
  41        _RS; _RS; _RS; _RS; _RS; _RS; _RS;
  42
  43        .text
  44
  45#ifdef CONFIG_KGDB
  46        .align  4
  47        .globl          arch_kgdb_breakpoint
  48        .type           arch_kgdb_breakpoint,#function
  49arch_kgdb_breakpoint:
  50        ta              0x7d
  51        retl
  52         nop
  53        .size           arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
  54#endif
  55
  56#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
  57        .align  4
  58        .globl  floppy_hardint
  59floppy_hardint:
  60        /*
  61         * This code cannot touch registers %l0 %l1 and %l2
  62         * because SAVE_ALL depends on their values. It depends
  63         * on %l3 also, but we regenerate it before a call.
  64         * Other registers are:
  65         * %l3 -- base address of fdc registers
  66         * %l4 -- pdma_vaddr
  67         * %l5 -- scratch for ld/st address
  68         * %l6 -- pdma_size
  69         * %l7 -- scratch [floppy byte, ld/st address, aux. data]
  70         */
  71
  72        /* Do we have work to do? */
  73        sethi   %hi(doing_pdma), %l7
  74        ld      [%l7 + %lo(doing_pdma)], %l7
  75        cmp     %l7, 0
  76        be      floppy_dosoftint
  77         nop
  78
  79        /* Load fdc register base */
  80        sethi   %hi(fdc_status), %l3
  81        ld      [%l3 + %lo(fdc_status)], %l3
  82
  83        /* Setup register addresses */
  84        sethi   %hi(pdma_vaddr), %l5    ! transfer buffer
  85        ld      [%l5 + %lo(pdma_vaddr)], %l4
  86        sethi   %hi(pdma_size), %l5     ! bytes to go
  87        ld      [%l5 + %lo(pdma_size)], %l6
  88next_byte:
  89        ldub    [%l3], %l7
  90
  91        andcc   %l7, 0x80, %g0          ! Does fifo still have data
  92        bz      floppy_fifo_emptied     ! fifo has been emptied...
  93         andcc  %l7, 0x20, %g0          ! in non-dma mode still?
  94        bz      floppy_overrun          ! nope, overrun
  95         andcc  %l7, 0x40, %g0          ! 0=write 1=read
  96        bz      floppy_write
  97         sub    %l6, 0x1, %l6
  98
  99        /* Ok, actually read this byte */
 100        ldub    [%l3 + 1], %l7
 101        orcc    %g0, %l6, %g0
 102        stb     %l7, [%l4]
 103        bne     next_byte
 104         add    %l4, 0x1, %l4
 105
 106        b       floppy_tdone
 107         nop
 108
 109floppy_write:
 110        /* Ok, actually write this byte */
 111        ldub    [%l4], %l7
 112        orcc    %g0, %l6, %g0
 113        stb     %l7, [%l3 + 1]
 114        bne     next_byte
 115         add    %l4, 0x1, %l4
 116
 117        /* fall through... */
 118floppy_tdone:
 119        sethi   %hi(pdma_vaddr), %l5
 120        st      %l4, [%l5 + %lo(pdma_vaddr)]
 121        sethi   %hi(pdma_size), %l5
 122        st      %l6, [%l5 + %lo(pdma_size)]
 123        /* Flip terminal count pin */
 124        set     auxio_register, %l7
 125        ld      [%l7], %l7
 126
 127        ldub    [%l7], %l5
 128
 129        or      %l5, 0xc2, %l5
 130        stb     %l5, [%l7]
 131        andn    %l5, 0x02, %l5
 132
 1332:
 134        /* Kill some time so the bits set */
 135        WRITE_PAUSE
 136        WRITE_PAUSE
 137
 138        stb     %l5, [%l7]
 139
 140        /* Prevent recursion */
 141        sethi   %hi(doing_pdma), %l7
 142        b       floppy_dosoftint
 143         st     %g0, [%l7 + %lo(doing_pdma)]
 144
 145        /* We emptied the FIFO, but we haven't read everything
 146         * as of yet.  Store the current transfer address and
 147         * bytes left to read so we can continue when the next
 148         * fast IRQ comes in.
 149         */
 150floppy_fifo_emptied:
 151        sethi   %hi(pdma_vaddr), %l5
 152        st      %l4, [%l5 + %lo(pdma_vaddr)]
 153        sethi   %hi(pdma_size), %l7
 154        st      %l6, [%l7 + %lo(pdma_size)]
 155
 156        /* Restore condition codes */
 157        wr      %l0, 0x0, %psr
 158        WRITE_PAUSE
 159
 160        jmp     %l1
 161        rett    %l2
 162
 163floppy_overrun:
 164        sethi   %hi(pdma_vaddr), %l5
 165        st      %l4, [%l5 + %lo(pdma_vaddr)]
 166        sethi   %hi(pdma_size), %l5
 167        st      %l6, [%l5 + %lo(pdma_size)]
 168        /* Prevent recursion */
 169        sethi   %hi(doing_pdma), %l7
 170        st      %g0, [%l7 + %lo(doing_pdma)]
 171
 172        /* fall through... */
 173floppy_dosoftint:
 174        rd      %wim, %l3
 175        SAVE_ALL
 176
 177        /* Set all IRQs off. */
 178        or      %l0, PSR_PIL, %l4
 179        wr      %l4, 0x0, %psr
 180        WRITE_PAUSE
 181        wr      %l4, PSR_ET, %psr
 182        WRITE_PAUSE
 183
 184        mov     11, %o0                 ! floppy irq level (unused anyway)
 185        mov     %g0, %o1                ! devid is not used in fast interrupts
 186        call    sparc_floppy_irq
 187         add    %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
 188
 189        RESTORE_ALL
 190        
 191#endif /* (CONFIG_BLK_DEV_FD) */
 192
 193        /* Bad trap handler */
 194        .globl  bad_trap_handler
 195bad_trap_handler:
 196        SAVE_ALL
 197
 198        wr      %l0, PSR_ET, %psr
 199        WRITE_PAUSE
 200
 201        add     %sp, STACKFRAME_SZ, %o0 ! pt_regs
 202        call    do_hw_interrupt
 203         mov    %l7, %o1                ! trap number
 204
 205        RESTORE_ALL
 206        
 207/* For now all IRQ's not registered get sent here. handler_irq() will
 208 * see if a routine is registered to handle this interrupt and if not
 209 * it will say so on the console.
 210 */
 211
 212        .align  4
 213        .globl  real_irq_entry, patch_handler_irq
 214real_irq_entry:
 215        SAVE_ALL
 216
 217#ifdef CONFIG_SMP
 218        .globl  patchme_maybe_smp_msg
 219
 220        cmp     %l7, 11
 221patchme_maybe_smp_msg:
 222        bgu     maybe_smp4m_msg
 223         nop
 224#endif
 225
 226real_irq_continue:
 227        or      %l0, PSR_PIL, %g2
 228        wr      %g2, 0x0, %psr
 229        WRITE_PAUSE
 230        wr      %g2, PSR_ET, %psr
 231        WRITE_PAUSE
 232        mov     %l7, %o0                ! irq level
 233patch_handler_irq:
 234        call    handler_irq
 235         add    %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
 236        or      %l0, PSR_PIL, %g2       ! restore PIL after handler_irq
 237        wr      %g2, PSR_ET, %psr       ! keep ET up
 238        WRITE_PAUSE
 239
 240        RESTORE_ALL
 241
 242#ifdef CONFIG_SMP
 243        /* SMP per-cpu ticker interrupts are handled specially. */
 244smp4m_ticker:
 245        bne     real_irq_continue+4
 246         or     %l0, PSR_PIL, %g2
 247        wr      %g2, 0x0, %psr
 248        WRITE_PAUSE
 249        wr      %g2, PSR_ET, %psr
 250        WRITE_PAUSE
 251        call    smp4m_percpu_timer_interrupt
 252         add    %sp, STACKFRAME_SZ, %o0
 253        wr      %l0, PSR_ET, %psr
 254        WRITE_PAUSE
 255        RESTORE_ALL
 256
 257#define GET_PROCESSOR4M_ID(reg) \
 258        rd      %tbr, %reg;     \
 259        srl     %reg, 12, %reg; \
 260        and     %reg, 3, %reg;
 261
 262        /* Here is where we check for possible SMP IPI passed to us
 263         * on some level other than 15 which is the NMI and only used
 264         * for cross calls.  That has a separate entry point below.
 265         *
 266         * IPIs are sent on Level 12, 13 and 14. See IRQ_IPI_*.
 267         */
 268maybe_smp4m_msg:
 269        GET_PROCESSOR4M_ID(o3)
 270        sethi   %hi(sun4m_irq_percpu), %l5
 271        sll     %o3, 2, %o3
 272        or      %l5, %lo(sun4m_irq_percpu), %o5
 273        sethi   %hi(0x70000000), %o2    ! Check all soft-IRQs
 274        ld      [%o5 + %o3], %o1
 275        ld      [%o1 + 0x00], %o3       ! sun4m_irq_percpu[cpu]->pending
 276        andcc   %o3, %o2, %g0
 277        be,a    smp4m_ticker
 278         cmp    %l7, 14
 279        /* Soft-IRQ IPI */
 280        st      %o2, [%o1 + 0x04]       ! sun4m_irq_percpu[cpu]->clear=0x70000000
 281        WRITE_PAUSE
 282        ld      [%o1 + 0x00], %g0       ! sun4m_irq_percpu[cpu]->pending
 283        WRITE_PAUSE
 284        or      %l0, PSR_PIL, %l4
 285        wr      %l4, 0x0, %psr
 286        WRITE_PAUSE
 287        wr      %l4, PSR_ET, %psr
 288        WRITE_PAUSE
 289        srl     %o3, 28, %o2            ! shift for simpler checks below
 290maybe_smp4m_msg_check_single:
 291        andcc   %o2, 0x1, %g0
 292        beq,a   maybe_smp4m_msg_check_mask
 293         andcc  %o2, 0x2, %g0
 294        call    smp_call_function_single_interrupt
 295         nop
 296        andcc   %o2, 0x2, %g0
 297maybe_smp4m_msg_check_mask:
 298        beq,a   maybe_smp4m_msg_check_resched
 299         andcc  %o2, 0x4, %g0
 300        call    smp_call_function_interrupt
 301         nop
 302        andcc   %o2, 0x4, %g0
 303maybe_smp4m_msg_check_resched:
 304        /* rescheduling is done in RESTORE_ALL regardless, but incr stats */
 305        beq,a   maybe_smp4m_msg_out
 306         nop
 307        call    smp_resched_interrupt
 308         nop
 309maybe_smp4m_msg_out:
 310        RESTORE_ALL
 311
 312        .align  4
 313        .globl  linux_trap_ipi15_sun4m
 314linux_trap_ipi15_sun4m:
 315        SAVE_ALL
 316        sethi   %hi(0x80000000), %o2
 317        GET_PROCESSOR4M_ID(o0)
 318        sethi   %hi(sun4m_irq_percpu), %l5
 319        or      %l5, %lo(sun4m_irq_percpu), %o5
 320        sll     %o0, 2, %o0
 321        ld      [%o5 + %o0], %o5
 322        ld      [%o5 + 0x00], %o3       ! sun4m_irq_percpu[cpu]->pending
 323        andcc   %o3, %o2, %g0
 324        be      sun4m_nmi_error         ! Must be an NMI async memory error
 325         st     %o2, [%o5 + 0x04]       ! sun4m_irq_percpu[cpu]->clear=0x80000000
 326        WRITE_PAUSE
 327        ld      [%o5 + 0x00], %g0       ! sun4m_irq_percpu[cpu]->pending
 328        WRITE_PAUSE
 329        or      %l0, PSR_PIL, %l4
 330        wr      %l4, 0x0, %psr
 331        WRITE_PAUSE
 332        wr      %l4, PSR_ET, %psr
 333        WRITE_PAUSE
 334        call    smp4m_cross_call_irq
 335         nop
 336        b       ret_trap_lockless_ipi
 337         clr    %l6
 338
 339        .globl  smp4d_ticker
 340        /* SMP per-cpu ticker interrupts are handled specially. */
 341smp4d_ticker:
 342        SAVE_ALL
 343        or      %l0, PSR_PIL, %g2
 344        sethi   %hi(CC_ICLR), %o0
 345        sethi   %hi(1 << 14), %o1
 346        or      %o0, %lo(CC_ICLR), %o0
 347        stha    %o1, [%o0] ASI_M_MXCC   /* Clear PIL 14 in MXCC's ICLR */
 348        wr      %g2, 0x0, %psr
 349        WRITE_PAUSE
 350        wr      %g2, PSR_ET, %psr
 351        WRITE_PAUSE
 352        call    smp4d_percpu_timer_interrupt
 353         add    %sp, STACKFRAME_SZ, %o0
 354        wr      %l0, PSR_ET, %psr
 355        WRITE_PAUSE
 356        RESTORE_ALL
 357
 358        .align  4
 359        .globl  linux_trap_ipi15_sun4d
 360linux_trap_ipi15_sun4d:
 361        SAVE_ALL
 362        sethi   %hi(CC_BASE), %o4
 363        sethi   %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
 364        or      %o4, (CC_EREG - CC_BASE), %o0
 365        ldda    [%o0] ASI_M_MXCC, %o0
 366        andcc   %o0, %o2, %g0
 367        bne     1f
 368         sethi  %hi(BB_STAT2), %o2
 369        lduba   [%o2] ASI_M_CTL, %o2
 370        andcc   %o2, BB_STAT2_MASK, %g0
 371        bne     2f
 372         or     %o4, (CC_ICLR - CC_BASE), %o0
 373        sethi   %hi(1 << 15), %o1
 374        stha    %o1, [%o0] ASI_M_MXCC   /* Clear PIL 15 in MXCC's ICLR */
 375        or      %l0, PSR_PIL, %l4
 376        wr      %l4, 0x0, %psr
 377        WRITE_PAUSE
 378        wr      %l4, PSR_ET, %psr
 379        WRITE_PAUSE
 380        call    smp4d_cross_call_irq
 381         nop
 382        b       ret_trap_lockless_ipi
 383         clr    %l6
 384
 3851:      /* MXCC error */
 3862:      /* BB error */
 387        /* Disable PIL 15 */
 388        set     CC_IMSK, %l4
 389        lduha   [%l4] ASI_M_MXCC, %l5
 390        sethi   %hi(1 << 15), %l7
 391        or      %l5, %l7, %l5
 392        stha    %l5, [%l4] ASI_M_MXCC
 393        /* FIXME */
 3941:      b,a     1b
 395
 396        .globl  smpleon_ipi
 397        .extern leon_ipi_interrupt
 398        /* SMP per-cpu IPI interrupts are handled specially. */
 399smpleon_ipi:
 400        SAVE_ALL
 401        or      %l0, PSR_PIL, %g2
 402        wr      %g2, 0x0, %psr
 403        WRITE_PAUSE
 404        wr      %g2, PSR_ET, %psr
 405        WRITE_PAUSE
 406        call    leonsmp_ipi_interrupt
 407         add    %sp, STACKFRAME_SZ, %o1 ! pt_regs
 408        wr      %l0, PSR_ET, %psr
 409        WRITE_PAUSE
 410        RESTORE_ALL
 411
 412        .align  4
 413        .globl  linux_trap_ipi15_leon
 414linux_trap_ipi15_leon:
 415        SAVE_ALL
 416        or      %l0, PSR_PIL, %l4
 417        wr      %l4, 0x0, %psr
 418        WRITE_PAUSE
 419        wr      %l4, PSR_ET, %psr
 420        WRITE_PAUSE
 421        call    leon_cross_call_irq
 422         nop
 423        b       ret_trap_lockless_ipi
 424         clr    %l6
 425
 426#endif /* CONFIG_SMP */
 427
 428        /* This routine handles illegal instructions and privileged
 429         * instruction attempts from user code.
 430         */
 431        .align  4
 432        .globl  bad_instruction
 433bad_instruction:
 434        sethi   %hi(0xc1f80000), %l4
 435        ld      [%l1], %l5
 436        sethi   %hi(0x81d80000), %l7
 437        and     %l5, %l4, %l5
 438        cmp     %l5, %l7
 439        be      1f
 440        SAVE_ALL
 441
 442        wr      %l0, PSR_ET, %psr               ! re-enable traps
 443        WRITE_PAUSE
 444
 445        add     %sp, STACKFRAME_SZ, %o0
 446        mov     %l1, %o1
 447        mov     %l2, %o2
 448        call    do_illegal_instruction
 449         mov    %l0, %o3
 450
 451        RESTORE_ALL
 452
 4531:      /* unimplemented flush - just skip */
 454        jmpl    %l2, %g0
 455         rett   %l2 + 4
 456
 457        .align  4
 458        .globl  priv_instruction
 459priv_instruction:
 460        SAVE_ALL
 461
 462        wr      %l0, PSR_ET, %psr
 463        WRITE_PAUSE
 464
 465        add     %sp, STACKFRAME_SZ, %o0
 466        mov     %l1, %o1
 467        mov     %l2, %o2
 468        call    do_priv_instruction
 469         mov    %l0, %o3
 470
 471        RESTORE_ALL
 472
 473        /* This routine handles unaligned data accesses. */
 474        .align  4
 475        .globl  mna_handler
 476mna_handler:
 477        andcc   %l0, PSR_PS, %g0
 478        be      mna_fromuser
 479         nop
 480
 481        SAVE_ALL
 482
 483        wr      %l0, PSR_ET, %psr
 484        WRITE_PAUSE
 485
 486        ld      [%l1], %o1
 487        call    kernel_unaligned_trap
 488         add    %sp, STACKFRAME_SZ, %o0
 489
 490        RESTORE_ALL
 491
 492mna_fromuser:
 493        SAVE_ALL
 494
 495        wr      %l0, PSR_ET, %psr               ! re-enable traps
 496        WRITE_PAUSE
 497
 498        ld      [%l1], %o1
 499        call    user_unaligned_trap
 500         add    %sp, STACKFRAME_SZ, %o0
 501
 502        RESTORE_ALL
 503
 504        /* This routine handles floating point disabled traps. */
 505        .align  4
 506        .globl  fpd_trap_handler
 507fpd_trap_handler:
 508        SAVE_ALL
 509
 510        wr      %l0, PSR_ET, %psr               ! re-enable traps
 511        WRITE_PAUSE
 512
 513        add     %sp, STACKFRAME_SZ, %o0
 514        mov     %l1, %o1
 515        mov     %l2, %o2
 516        call    do_fpd_trap
 517         mov    %l0, %o3
 518
 519        RESTORE_ALL
 520
 521        /* This routine handles Floating Point Exceptions. */
 522        .align  4
 523        .globl  fpe_trap_handler
 524fpe_trap_handler:
 525        set     fpsave_magic, %l5
 526        cmp     %l1, %l5
 527        be      1f
 528         sethi  %hi(fpsave), %l5
 529        or      %l5, %lo(fpsave), %l5
 530        cmp     %l1, %l5
 531        bne     2f
 532         sethi  %hi(fpsave_catch2), %l5
 533        or      %l5, %lo(fpsave_catch2), %l5
 534        wr      %l0, 0x0, %psr
 535        WRITE_PAUSE
 536        jmp     %l5
 537         rett   %l5 + 4
 5381:      
 539        sethi   %hi(fpsave_catch), %l5
 540        or      %l5, %lo(fpsave_catch), %l5
 541        wr      %l0, 0x0, %psr
 542        WRITE_PAUSE
 543        jmp     %l5
 544         rett   %l5 + 4
 545
 5462:
 547        SAVE_ALL
 548
 549        wr      %l0, PSR_ET, %psr               ! re-enable traps
 550        WRITE_PAUSE
 551
 552        add     %sp, STACKFRAME_SZ, %o0
 553        mov     %l1, %o1
 554        mov     %l2, %o2
 555        call    do_fpe_trap
 556         mov    %l0, %o3
 557
 558        RESTORE_ALL
 559
 560        /* This routine handles Tag Overflow Exceptions. */
 561        .align  4
 562        .globl  do_tag_overflow
 563do_tag_overflow:
 564        SAVE_ALL
 565
 566        wr      %l0, PSR_ET, %psr               ! re-enable traps
 567        WRITE_PAUSE
 568
 569        add     %sp, STACKFRAME_SZ, %o0
 570        mov     %l1, %o1
 571        mov     %l2, %o2
 572        call    handle_tag_overflow
 573         mov    %l0, %o3
 574
 575        RESTORE_ALL
 576
 577        /* This routine handles Watchpoint Exceptions. */
 578        .align  4
 579        .globl  do_watchpoint
 580do_watchpoint:
 581        SAVE_ALL
 582
 583        wr      %l0, PSR_ET, %psr               ! re-enable traps
 584        WRITE_PAUSE
 585
 586        add     %sp, STACKFRAME_SZ, %o0
 587        mov     %l1, %o1
 588        mov     %l2, %o2
 589        call    handle_watchpoint
 590         mov    %l0, %o3
 591
 592        RESTORE_ALL
 593
 594        /* This routine handles Register Access Exceptions. */
 595        .align  4
 596        .globl  do_reg_access
 597do_reg_access:
 598        SAVE_ALL
 599
 600        wr      %l0, PSR_ET, %psr               ! re-enable traps
 601        WRITE_PAUSE
 602
 603        add     %sp, STACKFRAME_SZ, %o0
 604        mov     %l1, %o1
 605        mov     %l2, %o2
 606        call    handle_reg_access
 607         mov    %l0, %o3
 608
 609        RESTORE_ALL
 610
 611        /* This routine handles Co-Processor Disabled Exceptions. */
 612        .align  4
 613        .globl  do_cp_disabled
 614do_cp_disabled:
 615        SAVE_ALL
 616
 617        wr      %l0, PSR_ET, %psr               ! re-enable traps
 618        WRITE_PAUSE
 619
 620        add     %sp, STACKFRAME_SZ, %o0
 621        mov     %l1, %o1
 622        mov     %l2, %o2
 623        call    handle_cp_disabled
 624         mov    %l0, %o3
 625
 626        RESTORE_ALL
 627
 628        /* This routine handles Co-Processor Exceptions. */
 629        .align  4
 630        .globl  do_cp_exception
 631do_cp_exception:
 632        SAVE_ALL
 633
 634        wr      %l0, PSR_ET, %psr               ! re-enable traps
 635        WRITE_PAUSE
 636
 637        add     %sp, STACKFRAME_SZ, %o0
 638        mov     %l1, %o1
 639        mov     %l2, %o2
 640        call    handle_cp_exception
 641         mov    %l0, %o3
 642
 643        RESTORE_ALL
 644
 645        /* This routine handles Hardware Divide By Zero Exceptions. */
 646        .align  4
 647        .globl  do_hw_divzero
 648do_hw_divzero:
 649        SAVE_ALL
 650
 651        wr      %l0, PSR_ET, %psr               ! re-enable traps
 652        WRITE_PAUSE
 653
 654        add     %sp, STACKFRAME_SZ, %o0
 655        mov     %l1, %o1
 656        mov     %l2, %o2
 657        call    handle_hw_divzero
 658         mov    %l0, %o3
 659
 660        RESTORE_ALL
 661
 662        .align  4
 663        .globl  do_flush_windows
 664do_flush_windows:
 665        SAVE_ALL
 666
 667        wr      %l0, PSR_ET, %psr
 668        WRITE_PAUSE
 669
 670        andcc   %l0, PSR_PS, %g0
 671        bne     dfw_kernel
 672         nop
 673
 674        call    flush_user_windows
 675         nop
 676
 677        /* Advance over the trap instruction. */
 678        ld      [%sp + STACKFRAME_SZ + PT_NPC], %l1
 679        add     %l1, 0x4, %l2
 680        st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
 681        st      %l2, [%sp + STACKFRAME_SZ + PT_NPC]
 682
 683        RESTORE_ALL
 684
 685        .globl  flush_patch_one
 686
 687        /* We get these for debugging routines using __builtin_return_address() */
 688dfw_kernel:
 689flush_patch_one:
 690        FLUSH_ALL_KERNEL_WINDOWS
 691
 692        /* Advance over the trap instruction. */
 693        ld      [%sp + STACKFRAME_SZ + PT_NPC], %l1
 694        add     %l1, 0x4, %l2
 695        st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
 696        st      %l2, [%sp + STACKFRAME_SZ + PT_NPC]
 697
 698        RESTORE_ALL
 699
 700        /* The getcc software trap.  The user wants the condition codes from
 701         * the %psr in register %g1.
 702         */
 703
 704        .align  4
 705        .globl  getcc_trap_handler
 706getcc_trap_handler:
 707        srl     %l0, 20, %g1    ! give user
 708        and     %g1, 0xf, %g1   ! only ICC bits in %psr
 709        jmp     %l2             ! advance over trap instruction
 710        rett    %l2 + 0x4       ! like this...
 711
 712        /* The setcc software trap.  The user has condition codes in %g1
 713         * that it would like placed in the %psr.  Be careful not to flip
 714         * any unintentional bits!
 715         */
 716
 717        .align  4
 718        .globl  setcc_trap_handler
 719setcc_trap_handler:
 720        sll     %g1, 0x14, %l4
 721        set     PSR_ICC, %l5
 722        andn    %l0, %l5, %l0   ! clear ICC bits in %psr
 723        and     %l4, %l5, %l4   ! clear non-ICC bits in user value
 724        or      %l4, %l0, %l4   ! or them in... mix mix mix
 725
 726        wr      %l4, 0x0, %psr  ! set new %psr
 727        WRITE_PAUSE             ! TI scumbags...
 728
 729        jmp     %l2             ! advance over trap instruction
 730        rett    %l2 + 0x4       ! like this...
 731
 732sun4m_nmi_error:
 733        /* NMI async memory error handling. */
 734        sethi   %hi(0x80000000), %l4
 735        sethi   %hi(sun4m_irq_global), %o5
 736        ld      [%o5 + %lo(sun4m_irq_global)], %l5
 737        st      %l4, [%l5 + 0x0c]       ! sun4m_irq_global->mask_set=0x80000000
 738        WRITE_PAUSE
 739        ld      [%l5 + 0x00], %g0       ! sun4m_irq_global->pending
 740        WRITE_PAUSE
 741        or      %l0, PSR_PIL, %l4
 742        wr      %l4, 0x0, %psr
 743        WRITE_PAUSE
 744        wr      %l4, PSR_ET, %psr
 745        WRITE_PAUSE
 746        call    sun4m_nmi
 747         nop
 748        st      %l4, [%l5 + 0x08]       ! sun4m_irq_global->mask_clear=0x80000000
 749        WRITE_PAUSE
 750        ld      [%l5 + 0x00], %g0       ! sun4m_irq_global->pending
 751        WRITE_PAUSE
 752        RESTORE_ALL
 753
 754#ifndef CONFIG_SMP
 755        .align  4
 756        .globl  linux_trap_ipi15_sun4m
 757linux_trap_ipi15_sun4m:
 758        SAVE_ALL
 759
 760        ba      sun4m_nmi_error
 761         nop
 762#endif /* CONFIG_SMP */
 763
 764        .align  4
 765        .globl  srmmu_fault
 766srmmu_fault:
 767        mov     0x400, %l5
 768        mov     0x300, %l4
 769
 770LEON_PI(lda     [%l5] ASI_LEON_MMUREGS, %l6)    ! read sfar first
 771SUN_PI_(lda     [%l5] ASI_M_MMUREGS, %l6)       ! read sfar first
 772
 773LEON_PI(lda     [%l4] ASI_LEON_MMUREGS, %l5)    ! read sfsr last
 774SUN_PI_(lda     [%l4] ASI_M_MMUREGS, %l5)       ! read sfsr last
 775
 776        andn    %l6, 0xfff, %l6
 777        srl     %l5, 6, %l5                     ! and encode all info into l7
 778
 779        and     %l5, 2, %l5
 780        or      %l5, %l6, %l6
 781
 782        or      %l6, %l7, %l7                   ! l7 = [addr,write,txtfault]
 783
 784        SAVE_ALL
 785
 786        mov     %l7, %o1
 787        mov     %l7, %o2
 788        and     %o1, 1, %o1             ! arg2 = text_faultp
 789        mov     %l7, %o3
 790        and     %o2, 2, %o2             ! arg3 = writep
 791        andn    %o3, 0xfff, %o3         ! arg4 = faulting address
 792
 793        wr      %l0, PSR_ET, %psr
 794        WRITE_PAUSE
 795
 796        call    do_sparc_fault
 797         add    %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
 798
 799        RESTORE_ALL
 800
 801        .align  4
 802        .globl  sys_nis_syscall
 803sys_nis_syscall:
 804        mov     %o7, %l5
 805        add     %sp, STACKFRAME_SZ, %o0         ! pt_regs *regs arg
 806        call    c_sys_nis_syscall
 807         mov    %l5, %o7
 808
 809sunos_execv:
 810        .globl  sunos_execv
 811        b       sys_execve
 812         clr    %i2
 813
 814        .align  4
 815        .globl  sys_sparc_pipe
 816sys_sparc_pipe:
 817        mov     %o7, %l5
 818        add     %sp, STACKFRAME_SZ, %o0         ! pt_regs *regs arg
 819        call    sparc_pipe
 820         mov    %l5, %o7
 821
 822        .align  4
 823        .globl  sys_sigstack
 824sys_sigstack:
 825        mov     %o7, %l5
 826        mov     %fp, %o2
 827        call    do_sys_sigstack
 828         mov    %l5, %o7
 829
 830        .align  4
 831        .globl  sys_sigreturn
 832sys_sigreturn:
 833        call    do_sigreturn
 834         add    %sp, STACKFRAME_SZ, %o0
 835
 836        ld      [%curptr + TI_FLAGS], %l5
 837        andcc   %l5, _TIF_SYSCALL_TRACE, %g0
 838        be      1f
 839         nop
 840
 841        call    syscall_trace
 842         mov    1, %o1
 843
 8441:
 845        /* We don't want to muck with user registers like a
 846         * normal syscall, just return.
 847         */
 848        RESTORE_ALL
 849
 850        .align  4
 851        .globl  sys_rt_sigreturn
 852sys_rt_sigreturn:
 853        call    do_rt_sigreturn
 854         add    %sp, STACKFRAME_SZ, %o0
 855
 856        ld      [%curptr + TI_FLAGS], %l5
 857        andcc   %l5, _TIF_SYSCALL_TRACE, %g0
 858        be      1f
 859         nop
 860
 861        add     %sp, STACKFRAME_SZ, %o0
 862        call    syscall_trace
 863         mov    1, %o1
 864
 8651:
 866        /* We are returning to a signal handler. */
 867        RESTORE_ALL
 868
 869        /* Now that we have a real sys_clone, sys_fork() is
 870         * implemented in terms of it.  Our _real_ implementation
 871         * of SunOS vfork() will use sys_vfork().
 872         *
 873         * XXX These three should be consolidated into mostly shared
 874         * XXX code just like on sparc64... -DaveM
 875         */
 876        .align  4
 877        .globl  sys_fork, flush_patch_two
 878sys_fork:
 879        mov     %o7, %l5
 880flush_patch_two:
 881        FLUSH_ALL_KERNEL_WINDOWS;
 882        ld      [%curptr + TI_TASK], %o4
 883        rd      %psr, %g4
 884        WRITE_PAUSE
 885        mov     SIGCHLD, %o0                    ! arg0: clone flags
 886        rd      %wim, %g5
 887        WRITE_PAUSE
 888        mov     %fp, %o1                        ! arg1: usp
 889        std     %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
 890        add     %sp, STACKFRAME_SZ, %o2         ! arg2: pt_regs ptr
 891        mov     0, %o3
 892        call    sparc_do_fork
 893         mov    %l5, %o7
 894
 895        /* Whee, kernel threads! */
 896        .globl  sys_clone, flush_patch_three
 897sys_clone:
 898        mov     %o7, %l5
 899flush_patch_three:
 900        FLUSH_ALL_KERNEL_WINDOWS;
 901        ld      [%curptr + TI_TASK], %o4
 902        rd      %psr, %g4
 903        WRITE_PAUSE
 904
 905        /* arg0,1: flags,usp  -- loaded already */
 906        cmp     %o1, 0x0                        ! Is new_usp NULL?
 907        rd      %wim, %g5
 908        WRITE_PAUSE
 909        be,a    1f
 910         mov    %fp, %o1                        ! yes, use callers usp
 911        andn    %o1, 7, %o1                     ! no, align to 8 bytes
 9121:
 913        std     %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
 914        add     %sp, STACKFRAME_SZ, %o2         ! arg2: pt_regs ptr
 915        mov     0, %o3
 916        call    sparc_do_fork
 917         mov    %l5, %o7
 918
 919        /* Whee, real vfork! */
 920        .globl  sys_vfork, flush_patch_four
 921sys_vfork:
 922flush_patch_four:
 923        FLUSH_ALL_KERNEL_WINDOWS;
 924        ld      [%curptr + TI_TASK], %o4
 925        rd      %psr, %g4
 926        WRITE_PAUSE
 927        rd      %wim, %g5
 928        WRITE_PAUSE
 929        std     %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
 930        sethi   %hi(0x4000 | 0x0100 | SIGCHLD), %o0
 931        mov     %fp, %o1
 932        or      %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
 933        sethi   %hi(sparc_do_fork), %l1
 934        mov     0, %o3
 935        jmpl    %l1 + %lo(sparc_do_fork), %g0
 936         add    %sp, STACKFRAME_SZ, %o2
 937
 938        .align  4
 939linux_sparc_ni_syscall:
 940        sethi   %hi(sys_ni_syscall), %l7
 941        b       do_syscall
 942         or     %l7, %lo(sys_ni_syscall), %l7
 943
 944linux_syscall_trace:
 945        add     %sp, STACKFRAME_SZ, %o0
 946        call    syscall_trace
 947         mov    0, %o1
 948        cmp     %o0, 0
 949        bne     3f
 950         mov    -ENOSYS, %o0
 951
 952        /* Syscall tracing can modify the registers.  */
 953        ld      [%sp + STACKFRAME_SZ + PT_G1], %g1
 954        sethi   %hi(sys_call_table), %l7
 955        ld      [%sp + STACKFRAME_SZ + PT_I0], %i0
 956        or      %l7, %lo(sys_call_table), %l7
 957        ld      [%sp + STACKFRAME_SZ + PT_I1], %i1
 958        ld      [%sp + STACKFRAME_SZ + PT_I2], %i2
 959        ld      [%sp + STACKFRAME_SZ + PT_I3], %i3
 960        ld      [%sp + STACKFRAME_SZ + PT_I4], %i4
 961        ld      [%sp + STACKFRAME_SZ + PT_I5], %i5
 962        cmp     %g1, NR_syscalls
 963        bgeu    3f
 964         mov    -ENOSYS, %o0
 965
 966        sll     %g1, 2, %l4
 967        mov     %i0, %o0
 968        ld      [%l7 + %l4], %l7
 969        mov     %i1, %o1
 970        mov     %i2, %o2
 971        mov     %i3, %o3
 972        b       2f
 973         mov    %i4, %o4
 974
 975        .globl  ret_from_fork
 976ret_from_fork:
 977        call    schedule_tail
 978         ld     [%g3 + TI_TASK], %o0
 979        b       ret_sys_call
 980         ld     [%sp + STACKFRAME_SZ + PT_I0], %o0
 981
 982        .globl  ret_from_kernel_thread
 983ret_from_kernel_thread:
 984        call    schedule_tail
 985         ld     [%g3 + TI_TASK], %o0
 986        ld      [%sp + STACKFRAME_SZ + PT_G1], %l0
 987        call    %l0
 988         ld     [%sp + STACKFRAME_SZ + PT_G2], %o0
 989        rd      %psr, %l1
 990        ld      [%sp + STACKFRAME_SZ + PT_PSR], %l0
 991        andn    %l0, PSR_CWP, %l0
 992        nop
 993        and     %l1, PSR_CWP, %l1
 994        or      %l0, %l1, %l0
 995        st      %l0, [%sp + STACKFRAME_SZ + PT_PSR]
 996        b       ret_sys_call
 997         mov    0, %o0
 998
 999        /* Linux native system calls enter here... */
1000        .align  4

1001        .globl  linux_sparc_syscall
1002linux_sparc_syscall:
1003        sethi   %hi(PSR_SYSCALL), %l4
1004        or      %l0, %l4, %l0
1005        /* Direct access to user regs, must faster. */
1006        cmp     %g1, NR_syscalls
1007        bgeu    linux_sparc_ni_syscall
1008         sll    %g1, 2, %l4
1009        ld      [%l7 + %l4], %l7
1010
1011do_syscall:
1012        SAVE_ALL_HEAD
1013         rd     %wim, %l3
1014
1015        wr      %l0, PSR_ET, %psr
1016        mov     %i0, %o0
1017        mov     %i1, %o1
1018        mov     %i2, %o2
1019
1020        ld      [%curptr + TI_FLAGS], %l5
1021        mov     %i3, %o3
1022        andcc   %l5, _TIF_SYSCALL_TRACE, %g0
1023        mov     %i4, %o4
1024        bne     linux_syscall_trace
1025         mov    %i0, %l5
10262:
1027        call    %l7
1028         mov    %i5, %o5
1029
10303:
1031        st      %o0, [%sp + STACKFRAME_SZ + PT_I0]
1032
1033ret_sys_call:
1034        ld      [%curptr + TI_FLAGS], %l6
1035        cmp     %o0, -ERESTART_RESTARTBLOCK
1036        ld      [%sp + STACKFRAME_SZ + PT_PSR], %g3
1037        set     PSR_C, %g2
1038        bgeu    1f
1039         andcc  %l6, _TIF_SYSCALL_TRACE, %g0
1040
1041        /* System call success, clear Carry condition code. */
1042        andn    %g3, %g2, %g3
1043        clr     %l6
1044        st      %g3, [%sp + STACKFRAME_SZ + PT_PSR]     
1045        bne     linux_syscall_trace2
1046         ld     [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1047        add     %l1, 0x4, %l2                   /* npc = npc+4 */
1048        st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
1049        b       ret_trap_entry
1050         st     %l2, [%sp + STACKFRAME_SZ + PT_NPC]
10511:
1052        /* System call failure, set Carry condition code.
1053         * Also, get abs(errno) to return to the process.
1054         */
1055        sub     %g0, %o0, %o0
1056        or      %g3, %g2, %g3
1057        st      %o0, [%sp + STACKFRAME_SZ + PT_I0]
1058        mov     1, %l6
1059        st      %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1060        bne     linux_syscall_trace2
1061         ld     [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1062        add     %l1, 0x4, %l2                   /* npc = npc+4 */
1063        st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
1064        b       ret_trap_entry
1065         st     %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1066
1067linux_syscall_trace2:
1068        add     %sp, STACKFRAME_SZ, %o0
1069        mov     1, %o1
1070        call    syscall_trace
1071         add    %l1, 0x4, %l2                   /* npc = npc+4 */
1072        st      %l1, [%sp + STACKFRAME_SZ + PT_PC]
1073        b       ret_trap_entry
1074         st     %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1075
1076
1077/* Saving and restoring the FPU state is best done from lowlevel code.
1078 *
1079 * void fpsave(unsigned long *fpregs, unsigned long *fsr,
1080 *             void *fpqueue, unsigned long *fpqdepth)
1081 */
1082
1083        .globl  fpsave
1084fpsave:
1085        st      %fsr, [%o1]     ! this can trap on us if fpu is in bogon state
1086        ld      [%o1], %g1
1087        set     0x2000, %g4
1088        andcc   %g1, %g4, %g0
1089        be      2f
1090         mov    0, %g2
1091
1092        /* We have an fpqueue to save. */
10931:
1094        std     %fq, [%o2]
1095fpsave_magic:
1096        st      %fsr, [%o1]
1097        ld      [%o1], %g3
1098        andcc   %g3, %g4, %g0
1099        add     %g2, 1, %g2
1100        bne     1b
1101         add    %o2, 8, %o2
1102
11032:
1104        st      %g2, [%o3]
1105
1106        std     %f0, [%o0 + 0x00]
1107        std     %f2, [%o0 + 0x08]
1108        std     %f4, [%o0 + 0x10]
1109        std     %f6, [%o0 + 0x18]
1110        std     %f8, [%o0 + 0x20]
1111        std     %f10, [%o0 + 0x28]
1112        std     %f12, [%o0 + 0x30]
1113        std     %f14, [%o0 + 0x38]
1114        std     %f16, [%o0 + 0x40]
1115        std     %f18, [%o0 + 0x48]
1116        std     %f20, [%o0 + 0x50]
1117        std     %f22, [%o0 + 0x58]
1118        std     %f24, [%o0 + 0x60]
1119        std     %f26, [%o0 + 0x68]
1120        std     %f28, [%o0 + 0x70]
1121        retl
1122         std    %f30, [%o0 + 0x78]
1123
1124        /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
1125         * code for pointing out this possible deadlock, while we save state
1126         * above we could trap on the fsr store so our low level fpu trap
1127         * code has to know how to deal with this.
1128         */
1129fpsave_catch:
1130        b       fpsave_magic + 4
1131         st     %fsr, [%o1]
1132
1133fpsave_catch2:
1134        b       fpsave + 4
1135         st     %fsr, [%o1]
1136
1137        /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
1138
1139        .globl  fpload
1140fpload:
1141        ldd     [%o0 + 0x00], %f0
1142        ldd     [%o0 + 0x08], %f2
1143        ldd     [%o0 + 0x10], %f4
1144        ldd     [%o0 + 0x18], %f6
1145        ldd     [%o0 + 0x20], %f8
1146        ldd     [%o0 + 0x28], %f10
1147        ldd     [%o0 + 0x30], %f12
1148        ldd     [%o0 + 0x38], %f14
1149        ldd     [%o0 + 0x40], %f16
1150        ldd     [%o0 + 0x48], %f18
1151        ldd     [%o0 + 0x50], %f20
1152        ldd     [%o0 + 0x58], %f22
1153        ldd     [%o0 + 0x60], %f24
1154        ldd     [%o0 + 0x68], %f26
1155        ldd     [%o0 + 0x70], %f28
1156        ldd     [%o0 + 0x78], %f30
1157        ld      [%o1], %fsr
1158        retl
1159         nop
1160
1161        /* __ndelay and __udelay take two arguments:
1162         * 0 - nsecs or usecs to delay
1163         * 1 - per_cpu udelay_val (loops per jiffy)
1164         *
1165         * Note that ndelay gives HZ times higher resolution but has a 10ms
1166         * limit.  udelay can handle up to 1s.
1167         */
1168        .globl  __ndelay
1169__ndelay:
1170        save    %sp, -STACKFRAME_SZ, %sp
1171        mov     %i0, %o0                ! round multiplier up so large ns ok
1172        mov     0x1ae, %o1              ! 2**32 / (1 000 000 000 / HZ)
1173        umul    %o0, %o1, %o0
1174        rd      %y, %o1
1175        mov     %i1, %o1                ! udelay_val
1176        umul    %o0, %o1, %o0
1177        rd      %y, %o1
1178        ba      delay_continue
1179         mov    %o1, %o0                ! >>32 later for better resolution
1180
1181        .globl  __udelay
1182__udelay:
1183        save    %sp, -STACKFRAME_SZ, %sp
1184        mov     %i0, %o0
1185        sethi   %hi(0x10c7), %o1        ! round multiplier up so large us ok
1186        or      %o1, %lo(0x10c7), %o1   ! 2**32 / 1 000 000
1187        umul    %o0, %o1, %o0
1188        rd      %y, %o1
1189        mov     %i1, %o1                ! udelay_val
1190        umul    %o0, %o1, %o0
1191        rd      %y, %o1
1192        sethi   %hi(0x028f4b62), %l0    ! Add in rounding constant * 2**32,
1193        or      %g0, %lo(0x028f4b62), %l0
1194        addcc   %o0, %l0, %o0           ! 2**32 * 0.009 999
1195        bcs,a   3f
1196         add    %o1, 0x01, %o1
11973:
1198        mov     HZ, %o0                 ! >>32 earlier for wider range
1199        umul    %o0, %o1, %o0
1200        rd      %y, %o1
1201
1202delay_continue:
1203        cmp     %o0, 0x0
12041:
1205        bne     1b
1206         subcc  %o0, 1, %o0
1207        
1208        ret
1209        restore
1210
1211        /* Handle a software breakpoint */
1212        /* We have to inform parent that child has stopped */
1213        .align 4
1214        .globl breakpoint_trap
1215breakpoint_trap:
1216        rd      %wim,%l3
1217        SAVE_ALL
1218        wr      %l0, PSR_ET, %psr
1219        WRITE_PAUSE
1220
1221        st      %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
1222        call    sparc_breakpoint
1223         add    %sp, STACKFRAME_SZ, %o0
1224
1225        RESTORE_ALL
1226
1227#ifdef CONFIG_KGDB
1228        .align  4
1229        .globl  kgdb_trap_low
1230        .type   kgdb_trap_low,#function
1231kgdb_trap_low:
1232        rd      %wim,%l3
1233        SAVE_ALL
1234        wr      %l0, PSR_ET, %psr
1235        WRITE_PAUSE
1236
1237        call    kgdb_trap
1238         add    %sp, STACKFRAME_SZ, %o0
1239
1240        RESTORE_ALL
1241        .size   kgdb_trap_low,.-kgdb_trap_low
1242#endif
1243
1244        .align  4
1245        .globl  flush_patch_exception
1246flush_patch_exception:
1247        FLUSH_ALL_KERNEL_WINDOWS;
1248        ldd     [%o0], %o6
1249        jmpl    %o7 + 0xc, %g0                  ! see asm-sparc/processor.h
1250         mov    1, %g1                          ! signal EFAULT condition
1251
1252        .align  4
1253        .globl  kill_user_windows, kuw_patch1_7win
1254        .globl  kuw_patch1
1255kuw_patch1_7win:        sll     %o3, 6, %o3
1256
1257        /* No matter how much overhead this routine has in the worst
1258         * case scenario, it is several times better than taking the
1259         * traps with the old method of just doing flush_user_windows().
1260         */
1261kill_user_windows:
1262        ld      [%g6 + TI_UWINMASK], %o0        ! get current umask
1263        orcc    %g0, %o0, %g0                   ! if no bits set, we are done
1264        be      3f                              ! nothing to do
1265         rd     %psr, %o5                       ! must clear interrupts
1266        or      %o5, PSR_PIL, %o4               ! or else that could change
1267        wr      %o4, 0x0, %psr                  ! the uwinmask state
1268        WRITE_PAUSE                             ! burn them cycles
12691:
1270        ld      [%g6 + TI_UWINMASK], %o0        ! get consistent state
1271        orcc    %g0, %o0, %g0                   ! did an interrupt come in?
1272        be      4f                              ! yep, we are done
1273         rd     %wim, %o3                       ! get current wim
1274        srl     %o3, 1, %o4                     ! simulate a save
1275kuw_patch1:
1276        sll     %o3, 7, %o3                     ! compute next wim
1277        or      %o4, %o3, %o3                   ! result
1278        andncc  %o0, %o3, %o0                   ! clean this bit in umask
1279        bne     kuw_patch1                      ! not done yet
1280         srl    %o3, 1, %o4                     ! begin another save simulation
1281        wr      %o3, 0x0, %wim                  ! set the new wim
1282        st      %g0, [%g6 + TI_UWINMASK]        ! clear uwinmask
12834:
1284        wr      %o5, 0x0, %psr                  ! re-enable interrupts
1285        WRITE_PAUSE                             ! burn baby burn
12863:
1287        retl                                    ! return
1288         st     %g0, [%g6 + TI_W_SAVED]         ! no windows saved
1289
1290        .align  4
1291        .globl  restore_current
1292restore_current:
1293        LOAD_CURRENT(g6, o0)
1294        retl
1295         nop
1296
1297#ifdef CONFIG_PCIC_PCI
1298#include <asm/pcic.h>
1299
1300        .align  4
1301        .globl  linux_trap_ipi15_pcic
1302linux_trap_ipi15_pcic:
1303        rd      %wim, %l3
1304        SAVE_ALL
1305
1306        /*
1307         * First deactivate NMI
1308         * or we cannot drop ET, cannot get window spill traps.
1309         * The busy loop is necessary because the PIO error
1310         * sometimes does not go away quickly and we trap again.
1311         */
1312        sethi   %hi(pcic_regs), %o1
1313        ld      [%o1 + %lo(pcic_regs)], %o2
1314
1315        ! Get pending status for printouts later.
1316        ld      [%o2 + PCI_SYS_INT_PENDING], %o0
1317
1318        mov     PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
1319        stb     %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
13201:
1321        ld      [%o2 + PCI_SYS_INT_PENDING], %o1
1322        andcc   %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
1323        bne     1b
1324         nop
1325
1326        or      %l0, PSR_PIL, %l4
1327        wr      %l4, 0x0, %psr
1328        WRITE_PAUSE
1329        wr      %l4, PSR_ET, %psr
1330        WRITE_PAUSE
1331
1332        call    pcic_nmi
1333         add    %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
1334        RESTORE_ALL
1335
1336        .globl  pcic_nmi_trap_patch
1337pcic_nmi_trap_patch:
1338        sethi   %hi(linux_trap_ipi15_pcic), %l3
1339        jmpl    %l3 + %lo(linux_trap_ipi15_pcic), %g0
1340         rd     %psr, %l0
1341        .word   0
1342
1343#endif /* CONFIG_PCIC_PCI */
1344
1345        .globl  flushw_all
1346flushw_all:
1347        save    %sp, -0x40, %sp
1348        save    %sp, -0x40, %sp
1349        save    %sp, -0x40, %sp
1350        save    %sp, -0x40, %sp
1351        save    %sp, -0x40, %sp
1352        save    %sp, -0x40, %sp
1353        save    %sp, -0x40, %sp
1354        restore
1355        restore
1356        restore
1357        restore
1358        restore
1359        restore
1360        ret
1361         restore
1362
1363#ifdef CONFIG_SMP
1364ENTRY(hard_smp_processor_id)
1365661:    rd              %tbr, %g1
1366        srl             %g1, 12, %o0
1367        and             %o0, 3, %o0
1368        .section        .cpuid_patch, "ax"
1369        /* Instruction location. */
1370        .word           661b
1371        /* SUN4D implementation. */
1372        lda             [%g0] ASI_M_VIKING_TMP1, %o0
1373        nop
1374        nop
1375        /* LEON implementation. */
1376        rd              %asr17, %o0
1377        srl             %o0, 0x1c, %o0
1378        nop
1379        .previous
1380        retl
1381         nop
1382ENDPROC(hard_smp_processor_id)
1383#endif
1384
1385/* End of entry.S */
1386