| 1 | /* |
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| 2 | * This file is subject to the terms and conditions of the GNU General Public |
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| 3 | * License. See the file "COPYING" in the main directory of this archive |
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| 4 | * for more details. |
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| 5 | * |
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| 6 | * Copyright (C) 2006 Cavium Networks |
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| 7 | * Cache error handler |
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| 8 | */ |
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| 9 | |
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| 10 | #include <asm/asm.h> |
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| 11 | #include <asm/regdef.h> |
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| 12 | #include <asm/mipsregs.h> |
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| 13 | #include <asm/stackframe.h> |
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| 14 | |
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| 15 | /* |
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| 16 | * Handle cache error. Indicate to the second level handler whether |
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| 17 | * the exception is recoverable. |
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| 18 | */ |
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| 19 | LEAF(except_vec2_octeon) |
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| 20 | |
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| 21 | .set push |
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| 22 | .set mips64r2 |
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| 23 | .set noreorder |
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| 24 | .set noat |
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| 25 | |
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| 26 | |
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| 27 | /* due to an errata we need to read the COP0 CacheErr (Dcache) |
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| 28 | * before any cache/DRAM access */ |
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| 29 | |
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| 30 | rdhwr k0, $0 /* get core_id */ |
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| 31 | PTR_LA k1, cache_err_dcache |
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| 32 | sll k0, k0, 3 |
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| 33 | PTR_ADDU k1, k0, k1 /* k1 = &cache_err_dcache[core_id] */ |
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| 34 | |
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| 35 | dmfc0 k0, CP0_CACHEERR, 1 |
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| 36 | sd k0, (k1) |
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| 37 | dmtc0 $0, CP0_CACHEERR, 1 |
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| 38 | |
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| 39 | /* check whether this is a nested exception */ |
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| 40 | mfc0 k1, CP0_STATUS |
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| 41 | andi k1, k1, ST0_EXL |
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| 42 | beqz k1, 1f |
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| 43 | nop |
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| 44 | j cache_parity_error_octeon_non_recoverable |
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| 45 | nop |
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| 46 | |
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| 47 | /* exception is recoverable */ |
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| 48 | 1: j handle_cache_err |
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| 49 | nop |
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| 50 | |
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| 51 | .set pop |
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| 52 | END(except_vec2_octeon) |
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| 53 | |
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| 54 | /* We need to jump to handle_cache_err so that the previous handler |
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| 55 | * can fit within 0x80 bytes. We also move from 0xFFFFFFFFAXXXXXXX |
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| 56 | * space (uncached) to the 0xFFFFFFFF8XXXXXXX space (cached). */ |
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| 57 | LEAF(handle_cache_err) |
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| 58 | .set push |
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| 59 | .set noreorder |
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| 60 | .set noat |
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| 61 | |
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| 62 | SAVE_ALL |
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| 63 | KMODE |
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| 64 | jal cache_parity_error_octeon_recoverable |
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| 65 | nop |
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| 66 | j ret_from_exception |
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| 67 | nop |
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| 68 | |
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| 69 | .set pop |
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| 70 | END(handle_cache_err) |
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| 71 | |
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