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/*
* arch/sh/mm/tlb-pteaex.c
*
* TLB operations for SH-X3 CPUs featuring PTE ASID Extensions.
*
* Copyright (C) 2009 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/kernel.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
void update_mmu_cache(struct vm_area_struct * vma,
unsigned long address, pte_t pte)
{
unsigned long flags;
unsigned long pteval;
unsigned long vpn;
/* Ptrace may call this routine. */
if (vma && current->active_mm != vma->vm_mm)
return;
#ifndef CONFIG_CACHE_OFF
{
unsigned long pfn = pte_pfn(pte);
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
if (!test_bit(PG_mapped, &page->flags)) {
unsigned long phys = pte_val(pte) & PTE_PHYS_MASK;
__flush_wback_region((void *)P1SEGADDR(phys),
PAGE_SIZE);
__set_bit(PG_mapped, &page->flags);
}
}
}
#endif
local_irq_save(flags);
/* Set PTEH register */
vpn = address & MMU_VPN_MASK;
__raw_writel(vpn, MMU_PTEH);
/* Set PTEAEX */
__raw_writel(get_asid(), MMU_PTEAEX);
pteval = pte.pte_low;
/* Set PTEA register */
#ifdef CONFIG_X2TLB
/*
* For the extended mode TLB this is trivial, only the ESZ and
* EPR bits need to be written out to PTEA, with the remainder of
* the protection bits (with the exception of the compat-mode SZ
* and PR bits, which are cleared) being written out in PTEL.
*/
__raw_writel(pte.pte_high, MMU_PTEA);
#endif
/* Set PTEL register */
pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
#ifdef CONFIG_CACHE_WRITETHROUGH
pteval |= _PAGE_WT;
#endif
/* conveniently, we want all the software flags to be 0 anyway */
__raw_writel(pteval, MMU_PTEL);
/* Load the TLB */
asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
local_irq_restore(flags);
}
/*
* While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
* data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
* address arrays. In compat mode the second array is inaccessible, while
* in extended mode, the legacy 8-bit ASID field in address array 1 has
* undefined behaviour.
*/
void __uses_jump_to_uncached local_flush_tlb_one(unsigned long asid,
unsigned long page)
{
jump_to_uncached();
__raw_writel(page, MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
__raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
back_to_cached();
}
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