| /* |
| * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| * |
| * 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. |
| */ |
| |
| #ifndef __ASM_TLB_MMU_V1_H__ |
| #define __ASM_TLB_MMU_V1_H__ |
| |
| #include <asm/mmu.h> |
| |
| #if defined(__ASSEMBLY__) && (CONFIG_ARC_MMU_VER == 1) |
| |
| .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 |
