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) 1995 - 1999 Ralf Baechle 7 * Copyright (C) 1999 Silicon Graphics, Inc. 8 * 9 * Cache error handler 10 */ 11 #include <asm/asm.h> 12 #include <asm/regdef.h> 13 #include <asm/mipsregs.h> 14 #include <asm/stackframe.h> 15 16 /* 17 * Game over. Go to the button. Press gently. Swear where allowed by 18 * legislation. 19 */ 20 LEAF(except_vec2_generic) 21 .set noreorder 22 .set noat 23 .set mips0 24 /* 25 * This is a very bad place to be. Our cache error 26 * detection has triggered. If we have write-back data 27 * in the cache, we may not be able to recover. As a 28 * first-order desperate measure, turn off KSEG0 cacheing. 29 */ 30 mfc0 k0,CP0_CONFIG 31 li k1,~CONF_CM_CMASK 32 and k0,k0,k1 33 ori k0,k0,CONF_CM_UNCACHED 34 mtc0 k0,CP0_CONFIG 35 /* Give it a few cycles to sink in... */ 36 nop 37 nop 38 nop 39 40 j cache_parity_error 41 nop 42 END(except_vec2_generic)