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-rw-r--r--arch/powerpc/mm/stab.c286
1 files changed, 0 insertions, 286 deletions
diff --git a/arch/powerpc/mm/stab.c b/arch/powerpc/mm/stab.c
deleted file mode 100644
index 3f8efa6f2997..000000000000
--- a/arch/powerpc/mm/stab.c
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * PowerPC64 Segment Translation Support.
- *
- * Dave Engebretsen and Mike Corrigan {engebret|mikejc}@us.ibm.com
- * Copyright (c) 2001 Dave Engebretsen
- *
- * Copyright (C) 2002 Anton Blanchard <anton@au.ibm.com>, IBM
- *
- * 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 <linux/memblock.h>
-
-#include <asm/pgtable.h>
-#include <asm/mmu.h>
-#include <asm/mmu_context.h>
-#include <asm/paca.h>
-#include <asm/cputable.h>
-#include <asm/prom.h>
-
-struct stab_entry {
- unsigned long esid_data;
- unsigned long vsid_data;
-};
-
-#define NR_STAB_CACHE_ENTRIES 8
-static DEFINE_PER_CPU(long, stab_cache_ptr);
-static DEFINE_PER_CPU(long [NR_STAB_CACHE_ENTRIES], stab_cache);
-
-/*
- * Create a segment table entry for the given esid/vsid pair.
- */
-static int make_ste(unsigned long stab, unsigned long esid, unsigned long vsid)
-{
- unsigned long esid_data, vsid_data;
- unsigned long entry, group, old_esid, castout_entry, i;
- unsigned int global_entry;
- struct stab_entry *ste, *castout_ste;
- unsigned long kernel_segment = (esid << SID_SHIFT) >= PAGE_OFFSET;
-
- vsid_data = vsid << STE_VSID_SHIFT;
- esid_data = esid << SID_SHIFT | STE_ESID_KP | STE_ESID_V;
- if (! kernel_segment)
- esid_data |= STE_ESID_KS;
-
- /* Search the primary group first. */
- global_entry = (esid & 0x1f) << 3;
- ste = (struct stab_entry *)(stab | ((esid & 0x1f) << 7));
-
- /* Find an empty entry, if one exists. */
- for (group = 0; group < 2; group++) {
- for (entry = 0; entry < 8; entry++, ste++) {
- if (!(ste->esid_data & STE_ESID_V)) {
- ste->vsid_data = vsid_data;
- eieio();
- ste->esid_data = esid_data;
- return (global_entry | entry);
- }
- }
- /* Now search the secondary group. */
- global_entry = ((~esid) & 0x1f) << 3;
- ste = (struct stab_entry *)(stab | (((~esid) & 0x1f) << 7));
- }
-
- /*
- * Could not find empty entry, pick one with a round robin selection.
- * Search all entries in the two groups.
- */
- castout_entry = get_paca()->stab_rr;
- for (i = 0; i < 16; i++) {
- if (castout_entry < 8) {
- global_entry = (esid & 0x1f) << 3;
- ste = (struct stab_entry *)(stab | ((esid & 0x1f) << 7));
- castout_ste = ste + castout_entry;
- } else {
- global_entry = ((~esid) & 0x1f) << 3;
- ste = (struct stab_entry *)(stab | (((~esid) & 0x1f) << 7));
- castout_ste = ste + (castout_entry - 8);
- }
-
- /* Dont cast out the first kernel segment */
- if ((castout_ste->esid_data & ESID_MASK) != PAGE_OFFSET)
- break;
-
- castout_entry = (castout_entry + 1) & 0xf;
- }
-
- get_paca()->stab_rr = (castout_entry + 1) & 0xf;
-
- /* Modify the old entry to the new value. */
-
- /* Force previous translations to complete. DRENG */
- asm volatile("isync" : : : "memory");
-
- old_esid = castout_ste->esid_data >> SID_SHIFT;
- castout_ste->esid_data = 0; /* Invalidate old entry */
-
- asm volatile("sync" : : : "memory"); /* Order update */
-
- castout_ste->vsid_data = vsid_data;
- eieio(); /* Order update */
- castout_ste->esid_data = esid_data;
-
- asm volatile("slbie %0" : : "r" (old_esid << SID_SHIFT));
- /* Ensure completion of slbie */
- asm volatile("sync" : : : "memory");
-
- return (global_entry | (castout_entry & 0x7));
-}
-
-/*
- * Allocate a segment table entry for the given ea and mm
- */
-static int __ste_allocate(unsigned long ea, struct mm_struct *mm)
-{
- unsigned long vsid;
- unsigned char stab_entry;
- unsigned long offset;
-
- /* Kernel or user address? */
- if (is_kernel_addr(ea)) {
- vsid = get_kernel_vsid(ea, MMU_SEGSIZE_256M);
- } else {
- if ((ea >= TASK_SIZE_USER64) || (! mm))
- return 1;
-
- vsid = get_vsid(mm->context.id, ea, MMU_SEGSIZE_256M);
- }
-
- stab_entry = make_ste(get_paca()->stab_addr, GET_ESID(ea), vsid);
-
- if (!is_kernel_addr(ea)) {
- offset = __get_cpu_var(stab_cache_ptr);
- if (offset < NR_STAB_CACHE_ENTRIES)
- __get_cpu_var(stab_cache[offset++]) = stab_entry;
- else
- offset = NR_STAB_CACHE_ENTRIES+1;
- __get_cpu_var(stab_cache_ptr) = offset;
-
- /* Order update */
- asm volatile("sync":::"memory");
- }
-
- return 0;
-}
-
-int ste_allocate(unsigned long ea)
-{
- return __ste_allocate(ea, current->mm);
-}
-
-/*
- * Do the segment table work for a context switch: flush all user
- * entries from the table, then preload some probably useful entries
- * for the new task
- */
-void switch_stab(struct task_struct *tsk, struct mm_struct *mm)
-{
- struct stab_entry *stab = (struct stab_entry *) get_paca()->stab_addr;
- struct stab_entry *ste;
- unsigned long offset;
- unsigned long pc = KSTK_EIP(tsk);
- unsigned long stack = KSTK_ESP(tsk);
- unsigned long unmapped_base;
-
- /* Force previous translations to complete. DRENG */
- asm volatile("isync" : : : "memory");
-
- /*
- * We need interrupts hard-disabled here, not just soft-disabled,
- * so that a PMU interrupt can't occur, which might try to access
- * user memory (to get a stack trace) and possible cause an STAB miss
- * which would update the stab_cache/stab_cache_ptr per-cpu variables.
- */
- hard_irq_disable();
-
- offset = __get_cpu_var(stab_cache_ptr);
- if (offset <= NR_STAB_CACHE_ENTRIES) {
- int i;
-
- for (i = 0; i < offset; i++) {
- ste = stab + __get_cpu_var(stab_cache[i]);
- ste->esid_data = 0; /* invalidate entry */
- }
- } else {
- unsigned long entry;
-
- /* Invalidate all entries. */
- ste = stab;
-
- /* Never flush the first entry. */
- ste += 1;
- for (entry = 1;
- entry < (HW_PAGE_SIZE / sizeof(struct stab_entry));
- entry++, ste++) {
- unsigned long ea;
- ea = ste->esid_data & ESID_MASK;
- if (!is_kernel_addr(ea)) {
- ste->esid_data = 0;
- }
- }
- }
-
- asm volatile("sync; slbia; sync":::"memory");
-
- __get_cpu_var(stab_cache_ptr) = 0;
-
- /* Now preload some entries for the new task */
- if (test_tsk_thread_flag(tsk, TIF_32BIT))
- unmapped_base = TASK_UNMAPPED_BASE_USER32;
- else
- unmapped_base = TASK_UNMAPPED_BASE_USER64;
-
- __ste_allocate(pc, mm);
-
- if (GET_ESID(pc) == GET_ESID(stack))
- return;
-
- __ste_allocate(stack, mm);
-
- if ((GET_ESID(pc) == GET_ESID(unmapped_base))
- || (GET_ESID(stack) == GET_ESID(unmapped_base)))
- return;
-
- __ste_allocate(unmapped_base, mm);
-
- /* Order update */
- asm volatile("sync" : : : "memory");
-}
-
-/*
- * Allocate segment tables for secondary CPUs. These must all go in
- * the first (bolted) segment, so that do_stab_bolted won't get a
- * recursive segment miss on the segment table itself.
- */
-void __init stabs_alloc(void)
-{
- int cpu;
-
- if (mmu_has_feature(MMU_FTR_SLB))
- return;
-
- for_each_possible_cpu(cpu) {
- unsigned long newstab;
-
- if (cpu == 0)
- continue; /* stab for CPU 0 is statically allocated */
-
- newstab = memblock_alloc_base(HW_PAGE_SIZE, HW_PAGE_SIZE,
- 1<<SID_SHIFT);
- newstab = (unsigned long)__va(newstab);
-
- memset((void *)newstab, 0, HW_PAGE_SIZE);
-
- paca[cpu].stab_addr = newstab;
- paca[cpu].stab_real = __pa(newstab);
- printk(KERN_INFO "Segment table for CPU %d at 0x%llx "
- "virtual, 0x%llx absolute\n",
- cpu, paca[cpu].stab_addr, paca[cpu].stab_real);
- }
-}
-
-/*
- * Build an entry for the base kernel segment and put it into
- * the segment table or SLB. All other segment table or SLB
- * entries are faulted in.
- */
-void stab_initialize(unsigned long stab)
-{
- unsigned long vsid = get_kernel_vsid(PAGE_OFFSET, MMU_SEGSIZE_256M);
- unsigned long stabreal;
-
- asm volatile("isync; slbia; isync":::"memory");
- make_ste(stab, GET_ESID(PAGE_OFFSET), vsid);
-
- /* Order update */
- asm volatile("sync":::"memory");
-
- /* Set ASR */
- stabreal = get_paca()->stab_real | 0x1ul;
-
- mtspr(SPRN_ASR, stabreal);
-}