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/*
* arch/sh/mm/tlb-sh4.c
*
* SH-4 specific TLB operations
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002 - 2007 Paul Mundt
*
* Released under the terms of the GNU GPL v2.0.
*/
#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_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
unsigned long flags, pteval, vpn;
/*
* Handle debugger faulting in for debugee.
*/
if (vma && current->active_mm != vma->vm_mm)
return;
local_irq_save(flags);
/* Set PTEH register */
vpn = (address & MMU_VPN_MASK) | get_asid();
__raw_writel(vpn, MMU_PTEH);
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);
#else
if (cpu_data->flags & CPU_HAS_PTEA) {
/* The last 3 bits and the first one of pteval contains
* the PTEA timing control and space attribute bits
*/
__raw_writel(copy_ptea_attributes(pteval), 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);
}
void local_flush_tlb_one(unsigned long asid, unsigned long page)
{
unsigned long addr, data;
/*
* NOTE: PTEH.ASID should be set to this MM
* _AND_ we need to write ASID to the array.
*
* It would be simple if we didn't need to set PTEH.ASID...
*/
addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
data = page | asid; /* VALID bit is off */
jump_to_uncached();
__raw_writel(data, addr);
back_to_cached();
}
void local_flush_tlb_all(void)
{
unsigned long flags, status;
int i;
/*
* Flush all the TLB.
*/
local_irq_save(flags);
jump_to_uncached();
status = __raw_readl(MMUCR);
status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
if (status == 0)
status = MMUCR_URB_NENTRIES;
for (i = 0; i < status; i++)
__raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
for (i = 0; i < 4; i++)
__raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
back_to_cached();
ctrl_barrier();
local_irq_restore(flags);
}
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