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

   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
  51arch_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
  61floppy_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
  90next_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
 111floppy_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... */
 120floppy_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
 1352:
 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         */
 152floppy_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
 165floppy_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... */
 175floppy_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
 197bad_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
 216real_irq_entry:
 217        SAVE_ALL
 218
 219#ifdef CONFIG_SMP
 220        .globl  patchme_maybe_smp_msg
 221
 222        cmp     %l7, 11
 223patchme_maybe_smp_msg:
 224        bgu     maybe_smp4m_msg
 225         nop
 226#endif
 227
 228real_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
 235patch_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. */
 246smp4m_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         */
 270maybe_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
 292maybe_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
 299maybe_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
 305maybe_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
 311maybe_smp4m_msg_out:
 312        RESTORE_ALL
 313
 314        .align  4
 315        .globl  linux_trap_ipi15_sun4m
 316linux_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. */
 343smp4d_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
 362linux_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
 3871:      /* MXCC error */
 3882:      /* 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 */
 3961:      b,a     1b
 397
 398        .globl  smpleon_ipi
 399        .extern leon_ipi_interrupt
 400        /* SMP per-cpu IPI interrupts are handled specially. */
 401smpleon_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
 416linux_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
 435bad_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
 4551:      /* unimplemented flush - just skip */
 456        jmpl    %l2, %g0
 457         rett   %l2 + 4
 458
 459        .align  4
 460        .globl  priv_instruction
 461priv_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
 478mna_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
 494mna_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
 509fpd_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
 526fpe_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
 5401:      
 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
 5482:
 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
 565do_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
 582do_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
 599do_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
 616do_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
 633do_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
 650do_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
 666do_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() */
 690dfw_kernel:
 691flush_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
 708getcc_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
 721setcc_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
 734sun4m_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
 759linux_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
 768srmmu_fault:
 769        mov     0x400, %l5
 770        mov     0x300, %l4
 771
 772LEON_PI(lda     [%l5] ASI_LEON_MMUREGS, %l6)    ! read sfar first
 773SUN_PI_(lda     [%l5] ASI_M_MMUREGS, %l6)       ! read sfar first
 774
 775LEON_PI(lda     [%l4] ASI_LEON_MMUREGS, %l5)    ! read sfsr last
 776SUN_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
 804sunos_execv:
 805        .globl  sunos_execv
 806        b       sys_execve
 807         clr    %i2
 808
 809        .align  4
 810        .globl  sys_sigstack
 811sys_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
 819sys_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
 8311:
 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
 839sys_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
 8521:
 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
 865sys_fork:
 866        mov     %o7, %l5
 867flush_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
 884sys_clone:
 885        mov     %o7, %l5
 886flush_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
 8991:
 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
 908sys_vfork:
 909flush_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
 926linux_sparc_ni_syscall:
 927        sethi   %hi(sys_ni_syscall), %l7
 928        b       do_syscall
 929         or     %l7, %lo(sys_ni_syscall), %l7
 930
 931linux_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
 963ret_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
 970ret_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
 989linux_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
 998do_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
10132:
1014        call    %l7
1015         mov    %i5, %o5
1016
10173:
1018        st      %o0, [%sp + STACKFRAME_SZ + PT_I0]
1019
1020ret_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]
10381:
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
1054linux_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
1071fpsave:
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. */
10801:
1081        std     %fq, [%o2]
1082fpsave_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
10902:
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         */
1116fpsave_catch:
1117        b       fpsave_magic + 4
1118         st     %fsr, [%o1]
1119
1120fpsave_catch2:
1121        b       fpsave + 4
1122         st     %fsr, [%o1]
1123
1124        /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
1125
1126        .globl  fpload
1127fpload:
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
11843:
1185        mov     HZ, %o0                 ! >>32 earlier for wider range
1186        umul    %o0, %o1, %o0
1187        rd      %y, %o1
1188
1189delay_continue:
1190        cmp     %o0, 0x0
11911:
1192        bne     1b
1193         subcc  %o0, 1, %o0
1194        
1195        ret
1196        restore
1197EXPORT_SYMBOL(__udelay)
1198EXPORT_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
1204breakpoint_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
1233flush_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
1242kuw_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         */
1248kill_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
12561:
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
1262kuw_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
12704:
1271        wr      %o5, 0x0, %psr                  ! re-enable interrupts
1272        WRITE_PAUSE                             ! burn baby burn
12733:
1274        retl                                    ! return
1275         st     %g0, [%g6 + TI_W_SAVED]         ! no windows saved
1276
1277        .align  4
1278        .globl  restore_current
1279restore_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
1289linux_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]
13071:
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
1324pcic_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
1333flushw_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
1351ENTRY(hard_smp_processor_id)
1352661:    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
1369ENDPROC(hard_smp_processor_id)
1370#endif
1371
1372/* End of entry.S */
1373