cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cex-gen.S (1006B)

      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)