/* * arch/sh/mm/tlb-sh4.c * * SH-4 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/smp_lock.h>#include <linux/interrupt.h>#include <asm/system.h>#include <asm/io.h>#include <asm/uaccess.h>#include <asm/pgalloc.h>#include <asm/hardirq.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;	struct page *page;	unsigned long pfn;	unsigned long ptea;	/* Ptrace may call this routine. */	if (vma && current->active_mm != vma->vm_mm)		return;	pfn = pte_pfn(pte);	if (pfn_valid(pfn)) {		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);		}	}	local_irq_save(flags);	/* Set PTEH register */	vpn = (address & MMU_VPN_MASK) | get_asid();	ctrl_outl(vpn, MMU_PTEH);	pteval = pte_val(pte);	/* Set PTEA register */	/* TODO: make this look less hacky */	ptea = ((pteval >> 28) & 0xe) | (pteval & 0x1);	ctrl_outl(ptea, MMU_PTEA);	/* Set PTEL register */	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */#ifdef CONFIG_SH_WRITETHROUGH	pteval |= _PAGE_WT;#endif	/* 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 __flush_tlb_page(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_P2();	ctrl_outl(data, addr);	back_to_P1();}