1 /*
2 * linux/arch/unicore32/mm/flush.c
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #include <linux/module.h>
13 #include <linux/mm.h>
14 #include <linux/pagemap.h>
15
16 #include <asm/cacheflush.h>
17 #include <asm/tlbflush.h>
18
flush_cache_mm(struct mm_struct * mm)19 void flush_cache_mm(struct mm_struct *mm)
20 {
21 }
22
flush_cache_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)23 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
24 unsigned long end)
25 {
26 if (vma->vm_flags & VM_EXEC)
27 __flush_icache_all();
28 }
29
flush_cache_page(struct vm_area_struct * vma,unsigned long user_addr,unsigned long pfn)30 void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr,
31 unsigned long pfn)
32 {
33 }
34
flush_ptrace_access(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * kaddr,unsigned long len)35 static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
36 unsigned long uaddr, void *kaddr, unsigned long len)
37 {
38 /* VIPT non-aliasing D-cache */
39 if (vma->vm_flags & VM_EXEC) {
40 unsigned long addr = (unsigned long)kaddr;
41
42 __cpuc_coherent_kern_range(addr, addr + len);
43 }
44 }
45
46 /*
47 * Copy user data from/to a page which is mapped into a different
48 * processes address space. Really, we want to allow our "user
49 * space" model to handle this.
50 *
51 * Note that this code needs to run on the current CPU.
52 */
copy_to_user_page(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * dst,const void * src,unsigned long len)53 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
54 unsigned long uaddr, void *dst, const void *src,
55 unsigned long len)
56 {
57 memcpy(dst, src, len);
58 flush_ptrace_access(vma, page, uaddr, dst, len);
59 }
60
__flush_dcache_page(struct address_space * mapping,struct page * page)61 void __flush_dcache_page(struct address_space *mapping, struct page *page)
62 {
63 /*
64 * Writeback any data associated with the kernel mapping of this
65 * page. This ensures that data in the physical page is mutually
66 * coherent with the kernels mapping.
67 */
68 __cpuc_flush_kern_dcache_area(page_address(page), PAGE_SIZE);
69 }
70
71 /*
72 * Ensure cache coherency between kernel mapping and userspace mapping
73 * of this page.
74 */
flush_dcache_page(struct page * page)75 void flush_dcache_page(struct page *page)
76 {
77 struct address_space *mapping;
78
79 /*
80 * The zero page is never written to, so never has any dirty
81 * cache lines, and therefore never needs to be flushed.
82 */
83 if (page == ZERO_PAGE(0))
84 return;
85
86 mapping = page_mapping(page);
87
88 if (mapping && !mapping_mapped(mapping))
89 clear_bit(PG_dcache_clean, &page->flags);
90 else {
91 __flush_dcache_page(mapping, page);
92 if (mapping)
93 __flush_icache_all();
94 set_bit(PG_dcache_clean, &page->flags);
95 }
96 }
97 EXPORT_SYMBOL(flush_dcache_page);
98