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/*
* arch/xtensa/mm/tlb.c
*
* Logic that manipulates the Xtensa MMU. Derived from MIPS.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2001 - 2003 Tensilica Inc.
*
* Joe Taylor
* Chris Zankel <chris@zankel.net>
* Marc Gauthier
*/
#include <linux/mm.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
static inline void __flush_itlb_all (void)
{
int w, i;
for (w = 0; w < ITLB_ARF_WAYS; w++) {
for (i = 0; i < (1 << XCHAL_ITLB_ARF_ENTRIES_LOG2); i++) {
int e = w + (i << PAGE_SHIFT);
invalidate_itlb_entry_no_isync(e);
}
}
asm volatile ("isync\n");
}
static inline void __flush_dtlb_all (void)
{
int w, i;
for (w = 0; w < DTLB_ARF_WAYS; w++) {
for (i = 0; i < (1 << XCHAL_DTLB_ARF_ENTRIES_LOG2); i++) {
int e = w + (i << PAGE_SHIFT);
invalidate_dtlb_entry_no_isync(e);
}
}
asm volatile ("isync\n");
}
void flush_tlb_all (void)
{
__flush_itlb_all();
__flush_dtlb_all();
}
/* If mm is current, we simply assign the current task a new ASID, thus,
* invalidating all previous tlb entries. If mm is someone else's user mapping,
* wie invalidate the context, thus, when that user mapping is swapped in,
* a new context will be assigned to it.
*/
void flush_tlb_mm(struct mm_struct *mm)
{
if (mm == current->active_mm) {
unsigned long flags;
local_save_flags(flags);
__get_new_mmu_context(mm);
__load_mmu_context(mm);
local_irq_restore(flags);
}
else
mm->context = 0;
}
#define _ITLB_ENTRIES (ITLB_ARF_WAYS << XCHAL_ITLB_ARF_ENTRIES_LOG2)
#define _DTLB_ENTRIES (DTLB_ARF_WAYS << XCHAL_DTLB_ARF_ENTRIES_LOG2)
#if _ITLB_ENTRIES > _DTLB_ENTRIES
# define _TLB_ENTRIES _ITLB_ENTRIES
#else
# define _TLB_ENTRIES _DTLB_ENTRIES
#endif
void flush_tlb_range (struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long flags;
if (mm->context == NO_CONTEXT)
return;
#if 0
printk("[tlbrange<%02lx,%08lx,%08lx>]\n",
(unsigned long)mm->context, start, end);
#endif
local_save_flags(flags);
if (end-start + (PAGE_SIZE-1) <= _TLB_ENTRIES << PAGE_SHIFT) {
int oldpid = get_rasid_register();
set_rasid_register (ASID_INSERT(mm->context));
start &= PAGE_MASK;
if (vma->vm_flags & VM_EXEC)
while(start < end) {
invalidate_itlb_mapping(start);
invalidate_dtlb_mapping(start);
start += PAGE_SIZE;
}
else
while(start < end) {
invalidate_dtlb_mapping(start);
start += PAGE_SIZE;
}
set_rasid_register(oldpid);
} else {
flush_tlb_mm(mm);
}
local_irq_restore(flags);
}
void flush_tlb_page (struct vm_area_struct *vma, unsigned long page)
{
struct mm_struct* mm = vma->vm_mm;
unsigned long flags;
int oldpid;
if(mm->context == NO_CONTEXT)
return;
local_save_flags(flags);
oldpid = get_rasid_register();
if (vma->vm_flags & VM_EXEC)
invalidate_itlb_mapping(page);
invalidate_dtlb_mapping(page);
set_rasid_register(oldpid);
local_irq_restore(flags);
}
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