You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.0 KiB
93 lines
2.0 KiB
/*
|
|
* arch/sh/mm/tlb-urb.c
|
|
*
|
|
* TLB entry wiring helpers for URB-equipped parts.
|
|
*
|
|
* Copyright (C) 2010 Matt Fleming
|
|
*
|
|
* 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/tlb.h>
|
|
#include <asm/mmu_context.h>
|
|
|
|
/*
|
|
* 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);
|
|
|
|
status = __raw_readl(MMUCR);
|
|
urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
|
|
status &= ~MMUCR_URC;
|
|
|
|
/*
|
|
* Make sure we're not trying to wire the last TLB entry slot.
|
|
*/
|
|
BUG_ON(!--urb);
|
|
|
|
urb = urb % MMUCR_URB_NENTRIES;
|
|
|
|
/*
|
|
* Insert this entry into the highest non-wired TLB slot (via
|
|
* the URC field).
|
|
*/
|
|
status |= (urb << MMUCR_URC_SHIFT);
|
|
__raw_writel(status, MMUCR);
|
|
ctrl_barrier();
|
|
|
|
/* Load the entry into the TLB */
|
|
__update_tlb(vma, addr, pte);
|
|
|
|
/* ... and wire it up. */
|
|
status = __raw_readl(MMUCR);
|
|
|
|
status &= ~MMUCR_URB;
|
|
status |= (urb << MMUCR_URB_SHIFT);
|
|
|
|
__raw_writel(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 = __raw_readl(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);
|
|
__raw_writel(status, MMUCR);
|
|
ctrl_barrier();
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|