145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/*
|
|
* 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_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;
|
|
__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();
|
|
}
|
|
|
|
/*
|
|
* Load the entry for 'addr' into the TLB and wire the entry.
|
|
*/
|
|
void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
|
|
{
|
|
unsigned long status, flags;
|
|
int urb;
|
|
|
|
local_irq_save(flags);
|
|
|
|
/* Load the entry into the TLB */
|
|
__update_tlb(vma, addr, pte);
|
|
|
|
/* ... and wire it up. */
|
|
status = ctrl_inl(MMUCR);
|
|
urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
|
|
status &= ~MMUCR_URB;
|
|
|
|
/*
|
|
* Make sure we're not trying to wire the last TLB entry slot.
|
|
*/
|
|
BUG_ON(!--urb);
|
|
|
|
urb = urb % MMUCR_URB_NENTRIES;
|
|
|
|
status |= (urb << MMUCR_URB_SHIFT);
|
|
ctrl_outl(status, MMUCR);
|
|
ctrl_barrier();
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* Unwire the last wired TLB entry.
|
|
*
|
|
* It should also be noted that it is not possible to wire and unwire
|
|
* TLB entries in an arbitrary order. If you wire TLB entry N, followed
|
|
* by entry N+1, you must unwire entry N+1 first, then entry N. In this
|
|
* respect, it works like a stack or LIFO queue.
|
|
*/
|
|
void tlb_unwire_entry(void)
|
|
{
|
|
unsigned long status, flags;
|
|
int urb;
|
|
|
|
local_irq_save(flags);
|
|
|
|
status = ctrl_inl(MMUCR);
|
|
urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
|
|
status &= ~MMUCR_URB;
|
|
|
|
/*
|
|
* Make sure we're not trying to unwire a TLB entry when none
|
|
* have been wired.
|
|
*/
|
|
BUG_ON(urb++ == MMUCR_URB_NENTRIES);
|
|
|
|
urb = urb % MMUCR_URB_NENTRIES;
|
|
|
|
status |= (urb << MMUCR_URB_SHIFT);
|
|
ctrl_outl(status, MMUCR);
|
|
ctrl_barrier();
|
|
|
|
local_irq_restore(flags);
|
|
}
|