2024-09-09 08:52:07 +00:00
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2006 Cavium Networks
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* Cache error handler
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*/
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#include <asm/asm.h>
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#include <asm/regdef.h>
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#include <asm/mipsregs.h>
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#include <asm/stackframe.h>
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/*
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* Handle cache error. Indicate to the second level handler whether
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* the exception is recoverable.
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*/
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LEAF(except_vec2_octeon)
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2024-09-09 08:57:42 +00:00
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.set push
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2024-09-09 08:52:07 +00:00
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.set mips64r2
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.set noreorder
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.set noat
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/* due to an errata we need to read the COP0 CacheErr (Dcache)
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* before any cache/DRAM access */
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2024-09-09 08:57:42 +00:00
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rdhwr k0, $0 /* get core_id */
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PTR_LA k1, cache_err_dcache
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sll k0, k0, 3
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2024-09-09 08:52:07 +00:00
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PTR_ADDU k1, k0, k1 /* k1 = &cache_err_dcache[core_id] */
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2024-09-09 08:57:42 +00:00
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dmfc0 k0, CP0_CACHEERR, 1
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sd k0, (k1)
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dmtc0 $0, CP0_CACHEERR, 1
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2024-09-09 08:52:07 +00:00
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2024-09-09 08:57:42 +00:00
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/* check whether this is a nested exception */
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mfc0 k1, CP0_STATUS
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andi k1, k1, ST0_EXL
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beqz k1, 1f
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2024-09-09 08:52:07 +00:00
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nop
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j cache_parity_error_octeon_non_recoverable
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nop
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/* exception is recoverable */
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1: j handle_cache_err
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nop
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2024-09-09 08:57:42 +00:00
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.set pop
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2024-09-09 08:52:07 +00:00
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END(except_vec2_octeon)
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/* We need to jump to handle_cache_err so that the previous handler
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* can fit within 0x80 bytes. We also move from 0xFFFFFFFFAXXXXXXX
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2024-09-09 08:57:42 +00:00
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* space (uncached) to the 0xFFFFFFFF8XXXXXXX space (cached). */
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2024-09-09 08:52:07 +00:00
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LEAF(handle_cache_err)
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2024-09-09 08:57:42 +00:00
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.set push
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.set noreorder
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.set noat
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2024-09-09 08:52:07 +00:00
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SAVE_ALL
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KMODE
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2024-09-09 08:57:42 +00:00
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jal cache_parity_error_octeon_recoverable
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2024-09-09 08:52:07 +00:00
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nop
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2024-09-09 08:57:42 +00:00
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j ret_from_exception
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2024-09-09 08:52:07 +00:00
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nop
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.set pop
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END(handle_cache_err)
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