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0906a3ad33
This fixes up the kmap_coherent/kunmap_coherent() interface for recent changes both in the page fault path and the shared cache flushers, as well as adding in some optimizations. One of the key things to note here is that the TLB flush itself is deferred until the unmap, and the call in to update_mmu_cache() itself goes away, relying on the regular page fault path to handle the lazy dcache writeback if necessary. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
97 lines
1.6 KiB
C
97 lines
1.6 KiB
C
/*
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* arch/sh/mm/nommu.c
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*
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* Various helper routines and stubs for MMUless SH.
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*
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* Copyright (C) 2002 - 2009 Paul Mundt
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*
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* Released under the terms of the GNU GPL v2.0.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/page.h>
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#include <asm/uaccess.h>
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/*
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* Nothing too terribly exciting here ..
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*/
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void copy_page(void *to, void *from)
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{
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memcpy(to, from, PAGE_SIZE);
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}
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__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n)
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{
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memcpy(to, from, n);
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return 0;
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}
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__kernel_size_t __clear_user(void *to, __kernel_size_t n)
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{
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memset(to, 0, n);
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return 0;
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}
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void local_flush_tlb_all(void)
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{
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BUG();
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}
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void local_flush_tlb_mm(struct mm_struct *mm)
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{
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BUG();
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}
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void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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BUG();
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}
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void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
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{
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BUG();
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}
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void local_flush_tlb_one(unsigned long asid, unsigned long page)
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{
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BUG();
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}
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void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
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{
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BUG();
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}
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void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
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{
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}
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void __init kmap_coherent_init(void)
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{
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}
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void *kmap_coherent(struct page *page, unsigned long addr)
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{
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BUG();
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return NULL;
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}
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void kunmap_coherent(void *kvaddr)
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{
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BUG();
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}
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void __init page_table_range_init(unsigned long start, unsigned long end,
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pgd_t *pgd_base)
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{
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}
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void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
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{
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}
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