LXR linux/arch/mips/mm/cex-oct.S

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2006 Cavium Networks
   7 * Cache error handler
   8 */
   9
  10#include <asm/asm.h>
  11#include <asm/regdef.h>
  12#include <asm/mipsregs.h>
  13#include <asm/stackframe.h>
  14
  15/*
  16 * Handle cache error. Indicate to the second level handler whether
  17 * the exception is recoverable.
  18 */
  19        LEAF(except_vec2_octeon)
  20
  21        .set    push
  22        .set    mips64r2
  23        .set    noreorder
  24        .set    noat
  25
  26
  27        /* due to an errata we need to read the COP0 CacheErr (Dcache)
  28         * before any cache/DRAM access  */
  29
  30        rdhwr   k0, $0        /* get core_id */
  31        PTR_LA  k1, cache_err_dcache
  32        sll     k0, k0, 3
  33        PTR_ADDU k1, k0, k1    /* k1 = &cache_err_dcache[core_id] */
  34
  35        dmfc0   k0, CP0_CACHEERR, 1
  36        sd      k0, (k1)
  37        dmtc0   $0, CP0_CACHEERR, 1
  38
  39        /* check whether this is a nested exception */
  40        mfc0    k1, CP0_STATUS
  41        andi    k1, k1, ST0_EXL
  42        beqz    k1, 1f
  43         nop
  44        j       cache_parity_error_octeon_non_recoverable
  45         nop
  46
  47        /* exception is recoverable */
  481:      j       handle_cache_err
  49         nop
  50
  51        .set    pop
  52        END(except_vec2_octeon)
  53
  54 /* We need to jump to handle_cache_err so that the previous handler
  55  * can fit within 0x80 bytes. We also move from 0xFFFFFFFFAXXXXXXX
  56  * space (uncached) to the 0xFFFFFFFF8XXXXXXX space (cached).  */
  57        LEAF(handle_cache_err)
  58        .set    push
  59        .set    noreorder
  60        .set    noat
  61
  62        SAVE_ALL
  63        KMODE
  64        jal     cache_parity_error_octeon_recoverable
  65        nop
  66        j       ret_from_exception
  67        nop
  68
  69        .set pop
  70        END(handle_cache_err)
  71