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/*
* TLB flushing operations for SH with an MMU.
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2003 - 2006 Paul Mundt
*
* 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.
*/
#include <linux/mm.h>
#include <linux/io.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
if (vma->vm_mm && vma->vm_mm->context.id != NO_CONTEXT) {
unsigned long flags;
unsigned long asid;
unsigned long saved_asid = MMU_NO_ASID;
asid = vma->vm_mm->context.id & MMU_CONTEXT_ASID_MASK;
page &= PAGE_MASK;
local_irq_save(flags);
if (vma->vm_mm != current->mm) {
saved_asid = get_asid();
set_asid(asid);
}
__flush_tlb_page(asid, page);
if (saved_asid != MMU_NO_ASID)
set_asid(saved_asid);
local_irq_restore(flags);
}
}
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
if (mm->context.id != NO_CONTEXT) {
unsigned long flags;
int size;
local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
mm->context.id = NO_CONTEXT;
if (mm == current->mm)
activate_context(mm);
} else {
unsigned long asid;
unsigned long saved_asid = MMU_NO_ASID;
asid = mm->context.id & MMU_CONTEXT_ASID_MASK;
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
if (mm != current->mm) {
saved_asid = get_asid();
set_asid(asid);
}
while (start < end) {
__flush_tlb_page(asid, start);
start += PAGE_SIZE;
}
if (saved_asid != MMU_NO_ASID)
set_asid(saved_asid);
}
local_irq_restore(flags);
}
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
unsigned long flags;
int size;
local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
flush_tlb_all();
} else {
unsigned long asid;
unsigned long saved_asid = get_asid();
asid = init_mm.context.id & MMU_CONTEXT_ASID_MASK;
start &= PAGE_MASK;
end += (PAGE_SIZE - 1);
end &= PAGE_MASK;
set_asid(asid);
while (start < end) {
__flush_tlb_page(asid, start);
start += PAGE_SIZE;
}
set_asid(saved_asid);
}
local_irq_restore(flags);
}
void flush_tlb_mm(struct mm_struct *mm)
{
/* Invalidate all TLB of this process. */
/* Instead of invalidating each TLB, we get new MMU context. */
if (mm->context.id != NO_CONTEXT) {
unsigned long flags;
local_irq_save(flags);
mm->context.id = NO_CONTEXT;
if (mm == current->mm)
activate_context(mm);
local_irq_restore(flags);
}
}
void flush_tlb_all(void)
{
unsigned long flags, status;
/*
* Flush all the TLB.
*
* Write to the MMU control register's bit:
* TF-bit for SH-3, TI-bit for SH-4.
* It's same position, bit #2.
*/
local_irq_save(flags);
status = ctrl_inl(MMUCR);
status |= 0x04;
ctrl_outl(status, MMUCR);
ctrl_barrier();
local_irq_restore(flags);
}
void update_mmu_cache(struct vm_area_struct *vma,
unsigned long address, pte_t pte)
{
unsigned long flags;
unsigned long pteval;
unsigned long vpn;
struct page *page;
unsigned long pfn = pte_pfn(pte);
struct address_space *mapping;
if (!pfn_valid(pfn))
return;
page = pfn_to_page(pfn);
mapping = page_mapping(page);
if (mapping) {
unsigned long phys = pte_val(pte) & PTE_PHYS_MASK;
int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
if (dirty)
__flush_wback_region((void *)P1SEGADDR(phys),
PAGE_SIZE);
}
local_irq_save(flags);
/* Set PTEH register */
vpn = (address & MMU_VPN_MASK) | get_asid();
ctrl_outl(vpn, MMU_PTEH);
pteval = pte_val(pte);
#ifdef CONFIG_CPU_HAS_PTEA
/* Set PTEA register */
/* TODO: make this look less hacky */
ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA);
#endif
/* Set PTEL register */
pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
#if defined(CONFIG_SH_WRITETHROUGH) && defined(CONFIG_CPU_SH4)
pteval |= _PAGE_WT;
#endif
/* conveniently, we want all the software flags to be 0 anyway */
ctrl_outl(pteval, MMU_PTEL);
/* Load the TLB */
asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
local_irq_restore(flags);
}
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