3ed6e12939
The TLB miss fast-path presently calls in to update_mmu_cache() to set up the entry, and does so with a NULL vma. Check for vma validity in the __update_tlb() ptrace checks. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
|
|
* arch/sh/mm/tlb-sh3.c
|
|
*
|
|
* SH-3 specific TLB operations
|
|
*
|
|
* Copyright (C) 1999 Niibe Yutaka
|
|
* Copyright (C) 2002 Paul Mundt
|
|
*
|
|
* Released under the terms of the GNU GPL v2.0.
|
|
*/
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgalloc.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();
|
|
ctrl_outl(vpn, MMU_PTEH);
|
|
|
|
pteval = pte_val(pte);
|
|
|
|
/* Set PTEL register */
|
|
pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
|
|
/* 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);
|
|
}
|
|
|
|
void local_flush_tlb_one(unsigned long asid, unsigned long page)
|
|
{
|
|
unsigned long addr, data;
|
|
int i, ways = MMU_NTLB_WAYS;
|
|
|
|
/*
|
|
* 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_TLB_ADDRESS_ARRAY | (page & 0x1F000);
|
|
data = (page & 0xfffe0000) | asid; /* VALID bit is off */
|
|
|
|
if ((current_cpu_data.flags & CPU_HAS_MMU_PAGE_ASSOC)) {
|
|
addr |= MMU_PAGE_ASSOC_BIT;
|
|
ways = 1; /* we already know the way .. */
|
|
}
|
|
|
|
for (i = 0; i < ways; i++)
|
|
ctrl_outl(data, addr + (i << 8));
|
|
}
|