/* * This file contains low-level functions for performing various * types of TLB invalidations on various processors with no hash * table. * * This file implements the following functions for all no-hash * processors. Some aren't implemented for some variants. Some * are inline in tlbflush.h * * - tlbil_va * - tlbil_pid * - tlbil_all * - tlbivax_bcast (not yet) * * Code mostly moved over from misc_32.S * * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Partially rewritten by Cort Dougan (cort@cs.nmt.edu) * Paul Mackerras, Kumar Gala and Benjamin Herrenschmidt. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <asm/reg.h> #include <asm/page.h> #include <asm/cputable.h> #include <asm/mmu.h> #include <asm/ppc_asm.h> #include <asm/asm-offsets.h> #include <asm/processor.h> #if defined(CONFIG_40x) /* * 40x implementation needs only tlbil_va */ _GLOBAL(__tlbil_va) /* We run the search with interrupts disabled because we have to change * the PID and I don't want to preempt when that happens. */ mfmsr r5 mfspr r6,SPRN_PID wrteei 0 mtspr SPRN_PID,r4 tlbsx. r3, 0, r3 mtspr SPRN_PID,r6 wrtee r5 bne 1f sync /* There are only 64 TLB entries, so r3 < 64, which means bit 25 is * clear. Since 25 is the V bit in the TLB_TAG, loading this value * will invalidate the TLB entry. */ tlbwe r3, r3, TLB_TAG isync 1: blr #elif defined(CONFIG_8xx) /* * Nothing to do for 8xx, everything is inline */ #elif defined(CONFIG_44x) /* * 440 implementation uses tlbsx/we for tlbil_va and a full sweep * of the TLB for everything else. */ _GLOBAL(__tlbil_va) mfspr r5,SPRN_MMUCR rlwimi r5,r4,0,24,31 /* Set TID */ /* We have to run the search with interrupts disabled, otherwise * an interrupt which causes a TLB miss can clobber the MMUCR * between the mtspr and the tlbsx. * * Critical and Machine Check interrupts take care of saving * and restoring MMUCR, so only normal interrupts have to be * taken care of. */ mfmsr r4 wrteei 0 mtspr SPRN_MMUCR,r5 tlbsx. r3, 0, r3 wrtee r4 bne 1f sync /* There are only 64 TLB entries, so r3 < 64, * which means bit 22, is clear. Since 22 is * the V bit in the TLB_PAGEID, loading this * value will invalidate the TLB entry. */ tlbwe r3, r3, PPC44x_TLB_PAGEID isync 1: blr _GLOBAL(_tlbil_all) _GLOBAL(_tlbil_pid) li r3,0 sync /* Load high watermark */ lis r4,tlb_44x_hwater@ha lwz r5,tlb_44x_hwater@l(r4) 1: tlbwe r3,r3,PPC44x_TLB_PAGEID addi r3,r3,1 cmpw 0,r3,r5 ble 1b isync blr #elif defined(CONFIG_FSL_BOOKE) /* * FSL BookE implementations. * * Since feature sections are using _SECTION_ELSE we need * to have the larger code path before the _SECTION_ELSE */ /* * Flush MMU TLB on the local processor */ _GLOBAL(_tlbil_all) BEGIN_MMU_FTR_SECTION li r3,(MMUCSR0_TLBFI)@l mtspr SPRN_MMUCSR0, r3 1: mfspr r3,SPRN_MMUCSR0 andi. r3,r3,MMUCSR0_TLBFI@l bne 1b MMU_FTR_SECTION_ELSE PPC_TLBILX_ALL(0,0) ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX) msync isync blr _GLOBAL(_tlbil_pid) BEGIN_MMU_FTR_SECTION slwi r3,r3,16 mfmsr r10 wrteei 0 mfspr r4,SPRN_MAS6 /* save MAS6 */ mtspr SPRN_MAS6,r3 PPC_TLBILX_PID(0,0) mtspr SPRN_MAS6,r4 /* restore MAS6 */ wrtee r10 MMU_FTR_SECTION_ELSE li r3,(MMUCSR0_TLBFI)@l mtspr SPRN_MMUCSR0, r3 1: mfspr r3,SPRN_MMUCSR0 andi. r3,r3,MMUCSR0_TLBFI@l bne 1b ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_USE_TLBILX) msync isync blr /* * Flush MMU TLB for a particular address, but only on the local processor * (no broadcast) */ _GLOBAL(__tlbil_va) mfmsr r10 wrteei 0 slwi r4,r4,16 ori r4,r4,(MAS6_ISIZE(BOOK3E_PAGESZ_4K))@l mtspr SPRN_MAS6,r4 /* assume AS=0 for now */ BEGIN_MMU_FTR_SECTION tlbsx 0,r3 mfspr r4,SPRN_MAS1 /* check valid */ andis. r3,r4,MAS1_VALID@h beq 1f rlwinm r4,r4,0,1,31 mtspr SPRN_MAS1,r4 tlbwe MMU_FTR_SECTION_ELSE PPC_TLBILX_VA(0,r3) ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX) msync isync 1: wrtee r10 blr #elif defined(CONFIG_PPC_BOOK3E) /* * New Book3E (>= 2.06) implementation * * Note: We may be able to get away without the interrupt masking stuff * if we save/restore MAS6 on exceptions that might modify it */ _GLOBAL(_tlbil_pid) slwi r4,r3,MAS6_SPID_SHIFT mfmsr r10 wrteei 0 mtspr SPRN_MAS6,r4 PPC_TLBILX_PID(0,0) wrtee r10 msync isync blr _GLOBAL(_tlbil_pid_noind) slwi r4,r3,MAS6_SPID_SHIFT mfmsr r10 ori r4,r4,MAS6_SIND wrteei 0 mtspr SPRN_MAS6,r4 PPC_TLBILX_PID(0,0) wrtee r10 msync isync blr _GLOBAL(_tlbil_all) PPC_TLBILX_ALL(0,0) msync isync blr _GLOBAL(_tlbil_va) mfmsr r10 wrteei 0 cmpwi cr0,r6,0 slwi r4,r4,MAS6_SPID_SHIFT rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK beq 1f rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND 1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */ PPC_TLBILX_VA(0,r3) msync isync wrtee r10 blr _GLOBAL(_tlbivax_bcast) mfmsr r10 wrteei 0 cmpwi cr0,r6,0 slwi r4,r4,MAS6_SPID_SHIFT rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK beq 1f rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND 1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */ PPC_TLBIVAX(0,r3) eieio tlbsync sync wrtee r10 blr _GLOBAL(set_context) #ifdef CONFIG_BDI_SWITCH /* Context switch the PTE pointer for the Abatron BDI2000. * The PGDIR is the second parameter. */ lis r5, abatron_pteptrs@h ori r5, r5, abatron_pteptrs@l stw r4, 0x4(r5) #endif mtspr SPRN_PID,r3 isync /* Force context change */ blr #else #error Unsupported processor type ! #endif