powerpc: Merge arch/ppc64/mm to arch/powerpc/mm
This moves the remaining files in arch/ppc64/mm to arch/powerpc/mm, and arranges that we use them when compiling with ARCH=ppc64. Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras
279
arch/powerpc/mm/stab.c
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279
arch/powerpc/mm/stab.c
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/*
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* PowerPC64 Segment Translation Support.
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*
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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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*
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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/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/mmu_context.h>
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#include <asm/paca.h>
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#include <asm/cputable.h>
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#include <asm/lmb.h>
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#include <asm/abs_addr.h>
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struct stab_entry {
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unsigned long esid_data;
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unsigned long vsid_data;
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};
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/* Both the segment table and SLB code uses the following cache */
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#define NR_STAB_CACHE_ENTRIES 8
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DEFINE_PER_CPU(long, stab_cache_ptr);
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DEFINE_PER_CPU(long, stab_cache[NR_STAB_CACHE_ENTRIES]);
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/*
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* Create a segment table entry for the given esid/vsid pair.
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*/
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static int make_ste(unsigned long stab, unsigned long esid, unsigned long vsid)
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{
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unsigned long esid_data, vsid_data;
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unsigned long entry, group, old_esid, castout_entry, i;
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unsigned int global_entry;
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struct stab_entry *ste, *castout_ste;
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unsigned long kernel_segment = (esid << SID_SHIFT) >= KERNELBASE;
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vsid_data = vsid << STE_VSID_SHIFT;
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esid_data = esid << SID_SHIFT | STE_ESID_KP | STE_ESID_V;
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if (! kernel_segment)
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esid_data |= STE_ESID_KS;
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/* Search the primary group first. */
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global_entry = (esid & 0x1f) << 3;
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ste = (struct stab_entry *)(stab | ((esid & 0x1f) << 7));
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/* Find an empty entry, if one exists. */
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for (group = 0; group < 2; group++) {
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for (entry = 0; entry < 8; entry++, ste++) {
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if (!(ste->esid_data & STE_ESID_V)) {
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ste->vsid_data = vsid_data;
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asm volatile("eieio":::"memory");
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ste->esid_data = esid_data;
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return (global_entry | entry);
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}
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}
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/* Now search the secondary group. */
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global_entry = ((~esid) & 0x1f) << 3;
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ste = (struct stab_entry *)(stab | (((~esid) & 0x1f) << 7));
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}
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/*
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* Could not find empty entry, pick one with a round robin selection.
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* Search all entries in the two groups.
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*/
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castout_entry = get_paca()->stab_rr;
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for (i = 0; i < 16; i++) {
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if (castout_entry < 8) {
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global_entry = (esid & 0x1f) << 3;
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ste = (struct stab_entry *)(stab | ((esid & 0x1f) << 7));
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castout_ste = ste + castout_entry;
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} else {
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global_entry = ((~esid) & 0x1f) << 3;
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ste = (struct stab_entry *)(stab | (((~esid) & 0x1f) << 7));
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castout_ste = ste + (castout_entry - 8);
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}
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/* Dont cast out the first kernel segment */
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if ((castout_ste->esid_data & ESID_MASK) != KERNELBASE)
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break;
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castout_entry = (castout_entry + 1) & 0xf;
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}
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get_paca()->stab_rr = (castout_entry + 1) & 0xf;
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/* Modify the old entry to the new value. */
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/* Force previous translations to complete. DRENG */
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asm volatile("isync" : : : "memory");
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old_esid = castout_ste->esid_data >> SID_SHIFT;
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castout_ste->esid_data = 0; /* Invalidate old entry */
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asm volatile("sync" : : : "memory"); /* Order update */
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castout_ste->vsid_data = vsid_data;
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asm volatile("eieio" : : : "memory"); /* Order update */
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castout_ste->esid_data = esid_data;
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asm volatile("slbie %0" : : "r" (old_esid << SID_SHIFT));
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/* Ensure completion of slbie */
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asm volatile("sync" : : : "memory");
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return (global_entry | (castout_entry & 0x7));
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}
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/*
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* Allocate a segment table entry for the given ea and mm
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*/
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static int __ste_allocate(unsigned long ea, struct mm_struct *mm)
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{
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unsigned long vsid;
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unsigned char stab_entry;
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unsigned long offset;
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/* Kernel or user address? */
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if (ea >= KERNELBASE) {
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vsid = get_kernel_vsid(ea);
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} else {
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if ((ea >= TASK_SIZE_USER64) || (! mm))
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return 1;
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vsid = get_vsid(mm->context.id, ea);
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}
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stab_entry = make_ste(get_paca()->stab_addr, GET_ESID(ea), vsid);
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if (ea < KERNELBASE) {
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offset = __get_cpu_var(stab_cache_ptr);
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if (offset < NR_STAB_CACHE_ENTRIES)
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__get_cpu_var(stab_cache[offset++]) = stab_entry;
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else
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offset = NR_STAB_CACHE_ENTRIES+1;
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__get_cpu_var(stab_cache_ptr) = offset;
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/* Order update */
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asm volatile("sync":::"memory");
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}
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return 0;
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}
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int ste_allocate(unsigned long ea)
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{
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return __ste_allocate(ea, current->mm);
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}
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/*
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* Do the segment table work for a context switch: flush all user
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* entries from the table, then preload some probably useful entries
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* for the new task
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*/
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void switch_stab(struct task_struct *tsk, struct mm_struct *mm)
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{
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struct stab_entry *stab = (struct stab_entry *) get_paca()->stab_addr;
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struct stab_entry *ste;
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unsigned long offset = __get_cpu_var(stab_cache_ptr);
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unsigned long pc = KSTK_EIP(tsk);
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unsigned long stack = KSTK_ESP(tsk);
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unsigned long unmapped_base;
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/* Force previous translations to complete. DRENG */
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asm volatile("isync" : : : "memory");
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if (offset <= NR_STAB_CACHE_ENTRIES) {
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int i;
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for (i = 0; i < offset; i++) {
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ste = stab + __get_cpu_var(stab_cache[i]);
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ste->esid_data = 0; /* invalidate entry */
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}
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} else {
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unsigned long entry;
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/* Invalidate all entries. */
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ste = stab;
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/* Never flush the first entry. */
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ste += 1;
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for (entry = 1;
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entry < (PAGE_SIZE / sizeof(struct stab_entry));
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entry++, ste++) {
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unsigned long ea;
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ea = ste->esid_data & ESID_MASK;
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if (ea < KERNELBASE) {
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ste->esid_data = 0;
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}
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}
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}
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asm volatile("sync; slbia; sync":::"memory");
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__get_cpu_var(stab_cache_ptr) = 0;
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/* Now preload some entries for the new task */
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if (test_tsk_thread_flag(tsk, TIF_32BIT))
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unmapped_base = TASK_UNMAPPED_BASE_USER32;
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else
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unmapped_base = TASK_UNMAPPED_BASE_USER64;
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__ste_allocate(pc, mm);
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if (GET_ESID(pc) == GET_ESID(stack))
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return;
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__ste_allocate(stack, mm);
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if ((GET_ESID(pc) == GET_ESID(unmapped_base))
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|| (GET_ESID(stack) == GET_ESID(unmapped_base)))
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return;
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__ste_allocate(unmapped_base, mm);
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/* Order update */
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asm volatile("sync" : : : "memory");
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}
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extern void slb_initialize(void);
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/*
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* Allocate segment tables for secondary CPUs. These must all go in
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* the first (bolted) segment, so that do_stab_bolted won't get a
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* recursive segment miss on the segment table itself.
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*/
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void stabs_alloc(void)
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{
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int cpu;
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if (cpu_has_feature(CPU_FTR_SLB))
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return;
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for_each_cpu(cpu) {
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unsigned long newstab;
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if (cpu == 0)
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continue; /* stab for CPU 0 is statically allocated */
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newstab = lmb_alloc_base(PAGE_SIZE, PAGE_SIZE, 1<<SID_SHIFT);
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if (! newstab)
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panic("Unable to allocate segment table for CPU %d.\n",
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cpu);
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newstab += KERNELBASE;
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memset((void *)newstab, 0, PAGE_SIZE);
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paca[cpu].stab_addr = newstab;
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paca[cpu].stab_real = virt_to_abs(newstab);
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printk(KERN_DEBUG "Segment table for CPU %d at 0x%lx virtual, 0x%lx absolute\n", cpu, paca[cpu].stab_addr, paca[cpu].stab_real);
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}
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}
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/*
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* Build an entry for the base kernel segment and put it into
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* the segment table or SLB. All other segment table or SLB
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* entries are faulted in.
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*/
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void stab_initialize(unsigned long stab)
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{
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unsigned long vsid = get_kernel_vsid(KERNELBASE);
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if (cpu_has_feature(CPU_FTR_SLB)) {
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slb_initialize();
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} else {
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asm volatile("isync; slbia; isync":::"memory");
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make_ste(stab, GET_ESID(KERNELBASE), vsid);
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/* Order update */
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asm volatile("sync":::"memory");
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}
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}
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