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151 lines
4.2 KiB
151 lines
4.2 KiB
/*
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* arch/ppc64/mm/slb_low.S
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*
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* Low-level SLB routines
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*
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* Copyright (C) 2004 David Gibson <dwg@au.ibm.com>, IBM
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*
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* Based on earlier C version:
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* Dave Engebretsen and Mike Corrigan {engebret|mikejc}@us.ibm.com
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* Copyright (c) 2001 Dave Engebretsen
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* Copyright (C) 2002 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/cputable.h>
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/* void slb_allocate(unsigned long ea);
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*
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* Create an SLB entry for the given EA (user or kernel).
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* r3 = faulting address, r13 = PACA
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* r9, r10, r11 are clobbered by this function
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* No other registers are examined or changed.
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*/
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_GLOBAL(slb_allocate)
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/*
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* First find a slot, round robin. Previously we tried to find
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* a free slot first but that took too long. Unfortunately we
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* dont have any LRU information to help us choose a slot.
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*/
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#ifdef CONFIG_PPC_ISERIES
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/*
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* On iSeries, the "bolted" stack segment can be cast out on
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* shared processor switch so we need to check for a miss on
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* it and restore it to the right slot.
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*/
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ld r9,PACAKSAVE(r13)
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clrrdi r9,r9,28
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clrrdi r11,r3,28
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li r10,SLB_NUM_BOLTED-1 /* Stack goes in last bolted slot */
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cmpld r9,r11
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beq 3f
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#endif /* CONFIG_PPC_ISERIES */
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ld r10,PACASTABRR(r13)
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addi r10,r10,1
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/* use a cpu feature mask if we ever change our slb size */
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cmpldi r10,SLB_NUM_ENTRIES
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blt+ 4f
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li r10,SLB_NUM_BOLTED
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4:
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std r10,PACASTABRR(r13)
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3:
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/* r3 = faulting address, r10 = entry */
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srdi r9,r3,60 /* get region */
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srdi r3,r3,28 /* get esid */
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cmpldi cr7,r9,0xc /* cmp KERNELBASE for later use */
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rldimi r10,r3,28,0 /* r10= ESID<<28 | entry */
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oris r10,r10,SLB_ESID_V@h /* r10 |= SLB_ESID_V */
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/* r3 = esid, r10 = esid_data, cr7 = <>KERNELBASE */
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blt cr7,0f /* user or kernel? */
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/* kernel address: proto-VSID = ESID */
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/* WARNING - MAGIC: we don't use the VSID 0xfffffffff, but
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* this code will generate the protoVSID 0xfffffffff for the
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* top segment. That's ok, the scramble below will translate
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* it to VSID 0, which is reserved as a bad VSID - one which
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* will never have any pages in it. */
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li r11,SLB_VSID_KERNEL
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BEGIN_FTR_SECTION
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bne cr7,9f
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li r11,(SLB_VSID_KERNEL|SLB_VSID_L)
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END_FTR_SECTION_IFSET(CPU_FTR_16M_PAGE)
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b 9f
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0: /* user address: proto-VSID = context<<15 | ESID */
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srdi. r9,r3,USER_ESID_BITS
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bne- 8f /* invalid ea bits set */
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#ifdef CONFIG_HUGETLB_PAGE
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BEGIN_FTR_SECTION
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lhz r9,PACAHIGHHTLBAREAS(r13)
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srdi r11,r3,(HTLB_AREA_SHIFT-SID_SHIFT)
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srd r9,r9,r11
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lhz r11,PACALOWHTLBAREAS(r13)
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srd r11,r11,r3
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or r9,r9,r11
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END_FTR_SECTION_IFSET(CPU_FTR_16M_PAGE)
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#endif /* CONFIG_HUGETLB_PAGE */
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li r11,SLB_VSID_USER
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#ifdef CONFIG_HUGETLB_PAGE
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BEGIN_FTR_SECTION
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rldimi r11,r9,8,55 /* shift masked bit into SLB_VSID_L */
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END_FTR_SECTION_IFSET(CPU_FTR_16M_PAGE)
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#endif /* CONFIG_HUGETLB_PAGE */
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ld r9,PACACONTEXTID(r13)
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rldimi r3,r9,USER_ESID_BITS,0
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9: /* r3 = protovsid, r11 = flags, r10 = esid_data, cr7 = <>KERNELBASE */
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ASM_VSID_SCRAMBLE(r3,r9)
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rldimi r11,r3,SLB_VSID_SHIFT,16 /* combine VSID and flags */
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/*
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* No need for an isync before or after this slbmte. The exception
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* we enter with and the rfid we exit with are context synchronizing.
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*/
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slbmte r11,r10
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bgelr cr7 /* we're done for kernel addresses */
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/* Update the slb cache */
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lhz r3,PACASLBCACHEPTR(r13) /* offset = paca->slb_cache_ptr */
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cmpldi r3,SLB_CACHE_ENTRIES
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bge 1f
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/* still room in the slb cache */
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sldi r11,r3,1 /* r11 = offset * sizeof(u16) */
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rldicl r10,r10,36,28 /* get low 16 bits of the ESID */
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add r11,r11,r13 /* r11 = (u16 *)paca + offset */
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sth r10,PACASLBCACHE(r11) /* paca->slb_cache[offset] = esid */
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addi r3,r3,1 /* offset++ */
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b 2f
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1: /* offset >= SLB_CACHE_ENTRIES */
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li r3,SLB_CACHE_ENTRIES+1
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2:
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sth r3,PACASLBCACHEPTR(r13) /* paca->slb_cache_ptr = offset */
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blr
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8: /* invalid EA */
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li r3,0 /* BAD_VSID */
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li r11,SLB_VSID_USER /* flags don't much matter */
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b 9b
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