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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/mm/cex-oct.S
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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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	.set    push

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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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	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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	PTR_ADDU k1, k0, k1    /* k1 = &cache_err_dcache[core_id] */

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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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        /* 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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	 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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	.set    pop

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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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  * space (uncached) to the 0xFFFFFFFF8XXXXXXX space (cached).  */

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	LEAF(handle_cache_err)

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	.set    push

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        .set    noreorder

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        .set    noat

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	SAVE_ALL

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	KMODE

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	jal     cache_parity_error_octeon_recoverable

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	nop

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	j       ret_from_exception

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	nop

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	.set pop

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	END(handle_cache_err)

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