98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
|
/*
|
||
|
|
* linux/arch/unicore32/mm/flush.c
|
||
|
|
*
|
||
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
||
|
|
*
|
||
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/pagemap.h>
|
||
|
|
|
||
|
|
#include <asm/cacheflush.h>
|
||
|
|
#include <asm/tlbflush.h>
|
||
|
|
|
||
|
|
void flush_cache_mm(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
|
||
|
|
unsigned long end)
|
||
|
|
{
|
||
|
|
if (vma->vm_flags & VM_EXEC)
|
||
|
|
__flush_icache_all();
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr,
|
||
|
|
unsigned long pfn)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
|
||
|
|
unsigned long uaddr, void *kaddr, unsigned long len)
|
||
|
|
{
|
||
|
|
/* VIPT non-aliasing D-cache */
|
||
|
|
if (vma->vm_flags & VM_EXEC) {
|
||
|
|
unsigned long addr = (unsigned long)kaddr;
|
||
|
|
|
||
|
|
__cpuc_coherent_kern_range(addr, addr + len);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copy user data from/to a page which is mapped into a different
|
||
|
|
* processes address space. Really, we want to allow our "user
|
||
|
|
* space" model to handle this.
|
||
|
|
*
|
||
|
|
* Note that this code needs to run on the current CPU.
|
||
|
|
*/
|
||
|
|
void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
|
||
|
|
unsigned long uaddr, void *dst, const void *src,
|
||
|
|
unsigned long len)
|
||
|
|
{
|
||
|
|
memcpy(dst, src, len);
|
||
|
|
flush_ptrace_access(vma, page, uaddr, dst, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __flush_dcache_page(struct address_space *mapping, struct page *page)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Writeback any data associated with the kernel mapping of this
|
||
|
|
* page. This ensures that data in the physical page is mutually
|
||
|
|
* coherent with the kernels mapping.
|
||
|
|
*/
|
||
|
|
__cpuc_flush_kern_dcache_area(page_address(page), PAGE_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Ensure cache coherency between kernel mapping and userspace mapping
|
||
|
|
* of this page.
|
||
|
|
*/
|
||
|
|
void flush_dcache_page(struct page *page)
|
||
|
|
{
|
||
|
|
struct address_space *mapping;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The zero page is never written to, so never has any dirty
|
||
|
|
* cache lines, and therefore never needs to be flushed.
|
||
|
|
*/
|
||
|
|
if (page == ZERO_PAGE(0))
|
||
|
|
return;
|
||
|
|
|
||
|
|
mapping = page_mapping_file(page);
|
||
|
|
|
||
|
|
if (mapping && !mapping_mapped(mapping))
|
||
|
|
clear_bit(PG_dcache_clean, &page->flags);
|
||
|
|
else {
|
||
|
|
__flush_dcache_page(mapping, page);
|
||
|
|
if (mapping)
|
||
|
|
__flush_icache_all();
|
||
|
|
set_bit(PG_dcache_clean, &page->flags);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flush_dcache_page);
|