| // SPDX-License-Identifier: GPL-2.0 | |
| // Copyright (C) 2005-2017 Andes Technology Corporation | |
| #ifndef _ASM_HIGHMEM_H | |
| #define _ASM_HIGHMEM_H | |
| #include <asm/proc-fns.h> | |
| #include <asm/kmap_types.h> | |
| #include <asm/fixmap.h> | |
| #include <asm/pgtable.h> | |
| /* | |
| * Right now we initialize only a single pte table. It can be extended | |
| * easily, subsequent pte tables have to be allocated in one physical | |
| * chunk of RAM. | |
| */ | |
| /* | |
| * Ordering is (from lower to higher memory addresses): | |
| * | |
| * high_memory | |
| * Persistent kmap area | |
| * PKMAP_BASE | |
| * fixed_addresses | |
| * FIXADDR_START | |
| * FIXADDR_TOP | |
| * Vmalloc area | |
| * VMALLOC_START | |
| * VMALLOC_END | |
| */ | |
| #define PKMAP_BASE ((FIXADDR_START - PGDIR_SIZE) & (PGDIR_MASK)) | |
| #define LAST_PKMAP PTRS_PER_PTE | |
| #define LAST_PKMAP_MASK (LAST_PKMAP - 1) | |
| #define PKMAP_NR(virt) (((virt) - (PKMAP_BASE)) >> PAGE_SHIFT) | |
| #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
| #define kmap_prot PAGE_KERNEL | |
| static inline void flush_cache_kmaps(void) | |
| { | |
| cpu_dcache_wbinval_all(); | |
| } | |
| /* declarations for highmem.c */ | |
| extern unsigned long highstart_pfn, highend_pfn; | |
| extern pte_t *pkmap_page_table; | |
| extern void *kmap_high(struct page *page); | |
| extern void kunmap_high(struct page *page); | |
| extern void kmap_init(void); | |
| /* | |
| * The following functions are already defined by <linux/highmem.h> | |
| * when CONFIG_HIGHMEM is not set. | |
| */ | |
| #ifdef CONFIG_HIGHMEM | |
| extern void *kmap(struct page *page); | |
| extern void kunmap(struct page *page); | |
| extern void *kmap_atomic(struct page *page); | |
| extern void __kunmap_atomic(void *kvaddr); | |
| extern void *kmap_atomic_pfn(unsigned long pfn); | |
| extern struct page *kmap_atomic_to_page(void *ptr); | |
| #endif | |
| #endif |