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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2007 MIPS Technologies, Inc.
*/
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <asm/bcache.h>
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
#include <asm/setup.h>
#include <asm/pgtable.h>
/* Cache operations. */
void (*flush_cache_all)(void);
void (*__flush_cache_all)(void);
EXPORT_SYMBOL_GPL(__flush_cache_all);
void (*flush_cache_mm)(struct mm_struct *mm);
void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
unsigned long end);
void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
unsigned long pfn);
void (*flush_icache_range)(unsigned long start, unsigned long end);
EXPORT_SYMBOL_GPL(flush_icache_range);
void (*local_flush_icache_range)(unsigned long start, unsigned long end);
EXPORT_SYMBOL_GPL(local_flush_icache_range);
void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
void (*__flush_cache_vmap)(void);
void (*__flush_cache_vunmap)(void);
void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
/* MIPS specific cache operations */
void (*flush_data_cache_page)(unsigned long addr);
void (*flush_icache_all)(void);
EXPORT_SYMBOL(flush_data_cache_page);
EXPORT_SYMBOL(flush_icache_all);
/*
* Dummy cache handling routine
*/
void cache_noop(void) {}
#ifdef CONFIG_BOARD_SCACHE
static struct bcache_ops no_sc_ops = {
.bc_enable = (void *)cache_noop,
.bc_disable = (void *)cache_noop,
.bc_wback_inv = (void *)cache_noop,
.bc_inv = (void *)cache_noop
};
struct bcache_ops *bcops = &no_sc_ops;
#endif
#ifdef CONFIG_DMA_NONCOHERENT
/* DMA cache operations. */
void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
void (*_dma_cache_wback)(unsigned long start, unsigned long size);
void (*_dma_cache_inv)(unsigned long start, unsigned long size);
#endif /* CONFIG_DMA_NONCOHERENT */
/*
* We could optimize the case where the cache argument is not BCACHE but
* that seems very atypical use ...
*/
SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
unsigned int, cache)
{
if (bytes == 0)
return 0;
if (!access_ok((void __user *) addr, bytes))
return -EFAULT;
__flush_icache_user_range(addr, addr + bytes);
return 0;
}
void __flush_dcache_pages(struct page *page, unsigned int nr)
{
struct folio *folio = page_folio(page);
struct address_space *mapping = folio_flush_mapping(folio);
unsigned long addr;
unsigned int i;
if (mapping && !mapping_mapped(mapping)) {
folio_set_dcache_dirty(folio);
return;
}
/*
* We could delay the flush for the !page_mapping case too. But that
* case is for exec env/arg pages and those are %99 certainly going to
* get faulted into the tlb (and thus flushed) anyways.
*/
for (i = 0; i < nr; i++) {
addr = (unsigned long)kmap_local_page(page + i);
flush_data_cache_page(addr);
kunmap_local((void *)addr);
}
}
EXPORT_SYMBOL(__flush_dcache_pages);
void __flush_anon_page(struct page *page, unsigned long vmaddr)
{
unsigned long addr = (unsigned long) page_address(page);
struct folio *folio = page_folio(page);
if (pages_do_alias(addr, vmaddr)) {
if (folio_mapped(folio) && !folio_test_dcache_dirty(folio)) {
void *kaddr;
kaddr = kmap_coherent(page, vmaddr);
flush_data_cache_page((unsigned long)kaddr);
kunmap_coherent();
} else
flush_data_cache_page(addr);
}
}
EXPORT_SYMBOL(__flush_anon_page);
void __update_cache(unsigned long address, pte_t pte)
{
struct folio *folio;
unsigned long pfn, addr;
int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
unsigned int i;
pfn = pte_pfn(pte);
if (unlikely(!pfn_valid(pfn)))
return;
folio = page_folio(pfn_to_page(pfn));
address &= PAGE_MASK;
address -= offset_in_folio(folio, pfn << PAGE_SHIFT);
if (folio_test_dcache_dirty(folio)) {
for (i = 0; i < folio_nr_pages(folio); i++) {
addr = (unsigned long)kmap_local_folio(folio, i);
if (exec || pages_do_alias(addr, address))
flush_data_cache_page(addr);
kunmap_local((void *)addr);
address += PAGE_SIZE;
}
folio_clear_dcache_dirty(folio);
}
}
unsigned long _page_cachable_default;
EXPORT_SYMBOL(_page_cachable_default);
#define PM(p) __pgprot(_page_cachable_default | (p))
static pgprot_t protection_map[16] __ro_after_init;
DECLARE_VM_GET_PAGE_PROT
static inline void setup_protection_map(void)
{
protection_map[0] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
protection_map[1] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
protection_map[2] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
protection_map[3] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
protection_map[4] = PM(_PAGE_PRESENT);
protection_map[5] = PM(_PAGE_PRESENT);
protection_map[6] = PM(_PAGE_PRESENT);
protection_map[7] = PM(_PAGE_PRESENT);
protection_map[8] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
protection_map[9] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE |
_PAGE_NO_READ);
protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
protection_map[12] = PM(_PAGE_PRESENT);
protection_map[13] = PM(_PAGE_PRESENT);
protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE);
protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE);
}
#undef PM
void cpu_cache_init(void)
{
if (cpu_has_3k_cache) {
extern void __weak r3k_cache_init(void);
r3k_cache_init();
}
if (cpu_has_4k_cache) {
extern void __weak r4k_cache_init(void);
r4k_cache_init();
}
if (cpu_has_octeon_cache) {
extern void __weak octeon_cache_init(void);
octeon_cache_init();
}
setup_protection_map();
}
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