OpenSDV
/
original_kernel
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
original_kernel/arch/arc/include/asm/tlb-mmu1.h

102 lines
3.3 KiB
C
Raw Normal View History

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-04 16:11:33 +08:00
/* SPDX-License-Identifier: GPL-2.0-only */
ARC: MMU Exception Handling * MMU I-TLB / D-TLB Miss Exceptions - Fast Path TLB Refill Handler - slowpath TLB creation via do_page_fault() -> update_mmu_cache() * Duplicate PD Exception Handler Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-01-18 17:42:19 +08:00
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*/
#ifndef __ASM_TLB_MMU_V1_H__
#define __ASM_TLB_MMU_V1_H__
ARC: Use kconfig helper IS_ENABLED() to get rid of defines.h Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-06-01 15:25:42 +08:00
#include <asm/mmu.h>
ARC: MMU Exception Handling * MMU I-TLB / D-TLB Miss Exceptions - Fast Path TLB Refill Handler - slowpath TLB creation via do_page_fault() -> update_mmu_cache() * Duplicate PD Exception Handler Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-01-18 17:42:19 +08:00
ARC: Use kconfig helper IS_ENABLED() to get rid of defines.h Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-06-01 15:25:42 +08:00
#if defined(__ASSEMBLY__) && (CONFIG_ARC_MMU_VER == 1)
ARC: MMU Exception Handling * MMU I-TLB / D-TLB Miss Exceptions - Fast Path TLB Refill Handler - slowpath TLB creation via do_page_fault() -> update_mmu_cache() * Duplicate PD Exception Handler Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-01-18 17:42:19 +08:00
.macro TLB_WRITE_HEURISTICS
#define JH_HACK1
#undef JH_HACK2
#undef JH_HACK3
#ifdef JH_HACK3
; Calculate set index for 2-way MMU
; -avoiding use of GetIndex from MMU
; and its unpleasant LFSR pseudo-random sequence
;
; r1 = TLBPD0 from TLB_RELOAD above
;
; -- jh_ex_way_set not cleared on startup
; didn't want to change setup.c
; hence extra instruction to clean
;
; -- should be in cache since in same line
; as r0/r1 saves above
;
ld r0,[jh_ex_way_sel] ; victim pointer
and r0,r0,1 ; clean
xor.f r0,r0,1 ; flip
st r0,[jh_ex_way_sel] ; store back
asr r0,r1,12 ; get set # <<1, note bit 12=R=0
or.nz r0,r0,1 ; set way bit
and r0,r0,0xff ; clean
sr r0,[ARC_REG_TLBINDEX]
#endif
#ifdef JH_HACK2
; JH hack #2
; Faster than hack #1 in non-thrash case, but hard-coded for 2-way MMU
; Slower in thrash case (where it matters) because more code is executed
; Inefficient due to two-register paradigm of this miss handler
;
/* r1 = data TLBPD0 at this point */
lr r0,[eret] /* instruction address */
xor r0,r0,r1 /* compare set # */
and.f r0,r0,0x000fe000 /* 2-way MMU mask */
bne 88f /* not in same set - no need to probe */
lr r0,[eret] /* instruction address */
and r0,r0,PAGE_MASK /* VPN of instruction address */
; lr r1,[ARC_REG_TLBPD0] /* Data VPN+ASID - already in r1 from TLB_RELOAD*/
and r1,r1,0xff /* Data ASID */
or r0,r0,r1 /* Instruction address + Data ASID */
lr r1,[ARC_REG_TLBPD0] /* save TLBPD0 containing data TLB*/
sr r0,[ARC_REG_TLBPD0] /* write instruction address to TLBPD0 */
sr TLBProbe, [ARC_REG_TLBCOMMAND] /* Look for instruction */
lr r0,[ARC_REG_TLBINDEX] /* r0 = index where instruction is, if at all */
sr r1,[ARC_REG_TLBPD0] /* restore TLBPD0 */
xor r0,r0,1 /* flip bottom bit of data index */
b.d 89f
sr r0,[ARC_REG_TLBINDEX] /* and put it back */
88:
sr TLBGetIndex, [ARC_REG_TLBCOMMAND]
89:
#endif
#ifdef JH_HACK1
;
; Always checks whether instruction will be kicked out by dtlb miss
;
mov_s r3, r1 ; save PD0 prepared by TLB_RELOAD in r3
lr r0,[eret] /* instruction address */
and r0,r0,PAGE_MASK /* VPN of instruction address */
bmsk r1,r3,7 /* Data ASID, bits 7-0 */
or_s r0,r0,r1 /* Instruction address + Data ASID */
sr r0,[ARC_REG_TLBPD0] /* write instruction address to TLBPD0 */
sr TLBProbe, [ARC_REG_TLBCOMMAND] /* Look for instruction */
lr r0,[ARC_REG_TLBINDEX] /* r0 = index where instruction is, if at all */
sr r3,[ARC_REG_TLBPD0] /* restore TLBPD0 */
sr TLBGetIndex, [ARC_REG_TLBCOMMAND]
lr r1,[ARC_REG_TLBINDEX] /* r1 = index where MMU wants to put data */
cmp r0,r1 /* if no match on indices, go around */
xor.eq r1,r1,1 /* flip bottom bit of data index */
sr r1,[ARC_REG_TLBINDEX] /* and put it back */
#endif
.endm
#endif
#endif