1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2007 MIPS Technologies, Inc.
8 */
9#include <linux/fs.h>
10#include <linux/fcntl.h>
11#include <linux/kernel.h>
12#include <linux/linkage.h>
13#include <linux/export.h>
14#include <linux/sched.h>
15#include <linux/syscalls.h>
16#include <linux/mm.h>
17#include <linux/highmem.h>
18#include <linux/pagemap.h>
19
20#include <asm/bcache.h>
21#include <asm/cacheflush.h>
22#include <asm/processor.h>
23#include <asm/cpu.h>
24#include <asm/cpu-features.h>
25#include <asm/setup.h>
26#include <asm/pgtable.h>
27
28/* Cache operations. */
29void (*flush_cache_all)(void);
30void (*__flush_cache_all)(void);
31EXPORT_SYMBOL_GPL(__flush_cache_all);
32void (*flush_cache_mm)(struct mm_struct *mm);
33void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
34	unsigned long end);
35void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
36	unsigned long pfn);
37void (*flush_icache_range)(unsigned long start, unsigned long end);
38EXPORT_SYMBOL_GPL(flush_icache_range);
39void (*local_flush_icache_range)(unsigned long start, unsigned long end);
40EXPORT_SYMBOL_GPL(local_flush_icache_range);
41void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
42void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
43EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
44
45void (*__flush_cache_vmap)(void);
46void (*__flush_cache_vunmap)(void);
47
48void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
49EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
50
51/* MIPS specific cache operations */
52void (*flush_data_cache_page)(unsigned long addr);
53void (*flush_icache_all)(void);
54
55EXPORT_SYMBOL(flush_data_cache_page);
56EXPORT_SYMBOL(flush_icache_all);
57
58/*
59 * Dummy cache handling routine
60 */
61
62void cache_noop(void) {}
63
64#ifdef CONFIG_BOARD_SCACHE
65
66static struct bcache_ops no_sc_ops = {
67	.bc_enable = (void *)cache_noop,
68	.bc_disable = (void *)cache_noop,
69	.bc_wback_inv = (void *)cache_noop,
70	.bc_inv = (void *)cache_noop
71};
72
73struct bcache_ops *bcops = &no_sc_ops;
74#endif
75
76#ifdef CONFIG_DMA_NONCOHERENT
77
78/* DMA cache operations. */
79void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
80void (*_dma_cache_wback)(unsigned long start, unsigned long size);
81void (*_dma_cache_inv)(unsigned long start, unsigned long size);
82
83#endif /* CONFIG_DMA_NONCOHERENT */
84
85/*
86 * We could optimize the case where the cache argument is not BCACHE but
87 * that seems very atypical use ...
88 */
89SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
90	unsigned int, cache)
91{
92	if (bytes == 0)
93		return 0;
94	if (!access_ok((void __user *) addr, bytes))
95		return -EFAULT;
96
97	__flush_icache_user_range(addr, addr + bytes);
98
99	return 0;
100}
101
102void __flush_dcache_pages(struct page *page, unsigned int nr)
103{
104	struct folio *folio = page_folio(page);
105	struct address_space *mapping = folio_flush_mapping(folio);
106	unsigned long addr;
107	unsigned int i;
108
109	if (mapping && !mapping_mapped(mapping)) {
110		folio_set_dcache_dirty(folio);
111		return;
112	}
113
114	/*
115	 * We could delay the flush for the !page_mapping case too.  But that
116	 * case is for exec env/arg pages and those are %99 certainly going to
117	 * get faulted into the tlb (and thus flushed) anyways.
118	 */
119	for (i = 0; i < nr; i++) {
120		addr = (unsigned long)kmap_local_page(nth_page(page, i));
121		flush_data_cache_page(addr);
122		kunmap_local((void *)addr);
123	}
124}
125EXPORT_SYMBOL(__flush_dcache_pages);
126
127void __flush_anon_page(struct page *page, unsigned long vmaddr)
128{
129	unsigned long addr = (unsigned long) page_address(page);
130	struct folio *folio = page_folio(page);
131
132	if (pages_do_alias(addr, vmaddr)) {
133		if (folio_mapped(folio) && !folio_test_dcache_dirty(folio)) {
134			void *kaddr;
135
136			kaddr = kmap_coherent(page, vmaddr);
137			flush_data_cache_page((unsigned long)kaddr);
138			kunmap_coherent();
139		} else
140			flush_data_cache_page(addr);
141	}
142}
143
144EXPORT_SYMBOL(__flush_anon_page);
145
146void __update_cache(unsigned long address, pte_t pte)
147{
148	struct folio *folio;
149	unsigned long pfn, addr;
150	int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
151	unsigned int i;
152
153	pfn = pte_pfn(pte);
154	if (unlikely(!pfn_valid(pfn)))
155		return;
156
157	folio = page_folio(pfn_to_page(pfn));
158	address &= PAGE_MASK;
159	address -= offset_in_folio(folio, pfn << PAGE_SHIFT);
160
161	if (folio_test_dcache_dirty(folio)) {
162		for (i = 0; i < folio_nr_pages(folio); i++) {
163			addr = (unsigned long)kmap_local_folio(folio, i);
164
165			if (exec || pages_do_alias(addr, address))
166				flush_data_cache_page(addr);
167			kunmap_local((void *)addr);
168			address += PAGE_SIZE;
169		}
170		folio_clear_dcache_dirty(folio);
171	}
172}
173
174unsigned long _page_cachable_default;
175EXPORT_SYMBOL(_page_cachable_default);
176
177#define PM(p)	__pgprot(_page_cachable_default | (p))
178
179static pgprot_t protection_map[16] __ro_after_init;
180DECLARE_VM_GET_PAGE_PROT
181
182static inline void setup_protection_map(void)
183{
184	protection_map[0]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
185	protection_map[1]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
186	protection_map[2]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
187	protection_map[3]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
188	protection_map[4]  = PM(_PAGE_PRESENT);
189	protection_map[5]  = PM(_PAGE_PRESENT);
190	protection_map[6]  = PM(_PAGE_PRESENT);
191	protection_map[7]  = PM(_PAGE_PRESENT);
192
193	protection_map[8]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
194	protection_map[9]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
195	protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE |
196				_PAGE_NO_READ);
197	protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
198	protection_map[12] = PM(_PAGE_PRESENT);
199	protection_map[13] = PM(_PAGE_PRESENT);
200	protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE);
201	protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE);
202}
203
204#undef PM
205
206void cpu_cache_init(void)
207{
208	if (IS_ENABLED(CONFIG_CPU_R3000) && cpu_has_3k_cache)
209		r3k_cache_init();
210	if (IS_ENABLED(CONFIG_CPU_R4K_CACHE_TLB) && cpu_has_4k_cache)
211		r4k_cache_init();
212
213	if (IS_ENABLED(CONFIG_CPU_CAVIUM_OCTEON) && cpu_has_octeon_cache)
214		octeon_cache_init();
215
216	setup_protection_map();
217}
218