v4.19.13 snapshot.
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
new file mode 100644
index 0000000..70a5231
--- /dev/null
+++ b/arch/mips/mm/cache.c
@@ -0,0 +1,246 @@
+/*
+ * 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 <asm/cacheflush.h>
+#include <asm/highmem.h>
+#include <asm/processor.h>
+#include <asm/cpu.h>
+#include <asm/cpu-features.h>
+#include <asm/setup.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);
+EXPORT_SYMBOL_GPL(__flush_icache_user_range);
+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_cache_sigtramp)(unsigned long addr);
+void (*local_flush_data_cache_page)(void * addr);
+void (*flush_data_cache_page)(unsigned long addr);
+void (*flush_icache_all)(void);
+
+EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
+EXPORT_SYMBOL(flush_data_cache_page);
+EXPORT_SYMBOL(flush_icache_all);
+
+#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);
+
+EXPORT_SYMBOL(_dma_cache_wback_inv);
+
+#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(VERIFY_WRITE, (void __user *) addr, bytes))
+ return -EFAULT;
+
+ __flush_icache_user_range(addr, addr + bytes);
+
+ return 0;
+}
+
+void __flush_dcache_page(struct page *page)
+{
+ struct address_space *mapping = page_mapping_file(page);
+ unsigned long addr;
+
+ if (mapping && !mapping_mapped(mapping)) {
+ SetPageDcacheDirty(page);
+ 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.
+ */
+ if (PageHighMem(page))
+ addr = (unsigned long)kmap_atomic(page);
+ else
+ addr = (unsigned long)page_address(page);
+
+ flush_data_cache_page(addr);
+
+ if (PageHighMem(page))
+ __kunmap_atomic((void *)addr);
+}
+
+EXPORT_SYMBOL(__flush_dcache_page);
+
+void __flush_anon_page(struct page *page, unsigned long vmaddr)
+{
+ unsigned long addr = (unsigned long) page_address(page);
+
+ if (pages_do_alias(addr, vmaddr)) {
+ if (page_mapcount(page) && !Page_dcache_dirty(page)) {
+ 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 page *page;
+ unsigned long pfn, addr;
+ int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
+
+ pfn = pte_pfn(pte);
+ if (unlikely(!pfn_valid(pfn)))
+ return;
+ page = pfn_to_page(pfn);
+ if (Page_dcache_dirty(page)) {
+ if (PageHighMem(page))
+ addr = (unsigned long)kmap_atomic(page);
+ else
+ addr = (unsigned long)page_address(page);
+
+ if (exec || pages_do_alias(addr, address & PAGE_MASK))
+ flush_data_cache_page(addr);
+
+ if (PageHighMem(page))
+ __kunmap_atomic((void *)addr);
+
+ ClearPageDcacheDirty(page);
+ }
+}
+
+unsigned long _page_cachable_default;
+EXPORT_SYMBOL(_page_cachable_default);
+
+static inline void setup_protection_map(void)
+{
+ if (cpu_has_rixi) {
+ protection_map[0] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+ protection_map[1] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+ protection_map[2] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+ protection_map[3] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+ protection_map[4] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+ protection_map[5] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+ protection_map[6] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+ protection_map[7] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+
+ protection_map[8] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+ protection_map[9] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+ protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
+ protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
+ protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+ protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+ protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
+ protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
+
+ } else {
+ protection_map[0] = PAGE_NONE;
+ protection_map[1] = PAGE_READONLY;
+ protection_map[2] = PAGE_COPY;
+ protection_map[3] = PAGE_COPY;
+ protection_map[4] = PAGE_READONLY;
+ protection_map[5] = PAGE_READONLY;
+ protection_map[6] = PAGE_COPY;
+ protection_map[7] = PAGE_COPY;
+ protection_map[8] = PAGE_NONE;
+ protection_map[9] = PAGE_READONLY;
+ protection_map[10] = PAGE_SHARED;
+ protection_map[11] = PAGE_SHARED;
+ protection_map[12] = PAGE_READONLY;
+ protection_map[13] = PAGE_READONLY;
+ protection_map[14] = PAGE_SHARED;
+ protection_map[15] = PAGE_SHARED;
+ }
+}
+
+void cpu_cache_init(void)
+{
+ if (cpu_has_3k_cache) {
+ extern void __weak r3k_cache_init(void);
+
+ r3k_cache_init();
+ }
+ if (cpu_has_6k_cache) {
+ extern void __weak r6k_cache_init(void);
+
+ r6k_cache_init();
+ }
+ if (cpu_has_4k_cache) {
+ extern void __weak r4k_cache_init(void);
+
+ r4k_cache_init();
+ }
+ if (cpu_has_8k_cache) {
+ extern void __weak r8k_cache_init(void);
+
+ r8k_cache_init();
+ }
+ if (cpu_has_tx39_cache) {
+ extern void __weak tx39_cache_init(void);
+
+ tx39_cache_init();
+ }
+
+ if (cpu_has_octeon_cache) {
+ extern void __weak octeon_cache_init(void);
+
+ octeon_cache_init();
+ }
+
+ setup_protection_map();
+}
+
+int __weak __uncached_access(struct file *file, unsigned long addr)
+{
+ if (file->f_flags & O_DSYNC)
+ return 1;
+
+ return addr >= __pa(high_memory);
+}