1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_HIGHMEM_INTERNAL_H
3 #define _LINUX_HIGHMEM_INTERNAL_H
6 * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft.
8 #ifdef CONFIG_KMAP_LOCAL
9 void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
10 void *__kmap_local_page_prot(struct page *page, pgprot_t prot);
11 void kunmap_local_indexed(void *vaddr);
12 void kmap_local_fork(struct task_struct *tsk);
13 void __kmap_local_sched_out(void);
14 void __kmap_local_sched_in(void);
15 static inline void kmap_assert_nomap(void)
17 DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx);
20 static inline void kmap_local_fork(struct task_struct *tsk) { }
21 static inline void kmap_assert_nomap(void) { }
25 #include <asm/highmem.h>
27 #ifndef ARCH_HAS_KMAP_FLUSH_TLB
28 static inline void kmap_flush_tlb(unsigned long addr) { }
32 #define kmap_prot PAGE_KERNEL
35 void *kmap_high(struct page *page);
36 void kunmap_high(struct page *page);
37 void __kmap_flush_unused(void);
38 struct page *__kmap_to_page(void *addr);
40 static inline void *kmap(struct page *page)
45 if (!PageHighMem(page))
46 addr = page_address(page);
48 addr = kmap_high(page);
49 kmap_flush_tlb((unsigned long)addr);
53 static inline void kunmap(struct page *page)
56 if (!PageHighMem(page))
61 static inline struct page *kmap_to_page(void *addr)
63 return __kmap_to_page(addr);
66 static inline void kmap_flush_unused(void)
68 __kmap_flush_unused();
71 static inline void *kmap_local_page(struct page *page)
73 return __kmap_local_page_prot(page, kmap_prot);
76 static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot)
78 return __kmap_local_page_prot(page, prot);
81 static inline void *kmap_local_pfn(unsigned long pfn)
83 return __kmap_local_pfn_prot(pfn, kmap_prot);
86 static inline void __kunmap_local(void *vaddr)
88 kunmap_local_indexed(vaddr);
91 static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
95 return __kmap_local_page_prot(page, prot);
98 static inline void *kmap_atomic(struct page *page)
100 return kmap_atomic_prot(page, kmap_prot);
103 static inline void *kmap_atomic_pfn(unsigned long pfn)
107 return __kmap_local_pfn_prot(pfn, kmap_prot);
110 static inline void __kunmap_atomic(void *addr)
112 kunmap_local_indexed(addr);
117 unsigned int __nr_free_highpages(void);
118 extern atomic_long_t _totalhigh_pages;
120 static inline unsigned int nr_free_highpages(void)
122 return __nr_free_highpages();
125 static inline unsigned long totalhigh_pages(void)
127 return (unsigned long)atomic_long_read(&_totalhigh_pages);
130 static inline void totalhigh_pages_add(long count)
132 atomic_long_add(count, &_totalhigh_pages);
135 #else /* CONFIG_HIGHMEM */
137 static inline struct page *kmap_to_page(void *addr)
139 return virt_to_page(addr);
142 static inline void *kmap(struct page *page)
145 return page_address(page);
148 static inline void kunmap_high(struct page *page) { }
149 static inline void kmap_flush_unused(void) { }
151 static inline void kunmap(struct page *page)
153 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
154 kunmap_flush_on_unmap(page_address(page));
158 static inline void *kmap_local_page(struct page *page)
160 return page_address(page);
163 static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot)
165 return kmap_local_page(page);
168 static inline void *kmap_local_pfn(unsigned long pfn)
170 return kmap_local_page(pfn_to_page(pfn));
173 static inline void __kunmap_local(void *addr)
175 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
176 kunmap_flush_on_unmap(addr);
180 static inline void *kmap_atomic(struct page *page)
184 return page_address(page);
187 static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
189 return kmap_atomic(page);
192 static inline void *kmap_atomic_pfn(unsigned long pfn)
194 return kmap_atomic(pfn_to_page(pfn));
197 static inline void __kunmap_atomic(void *addr)
199 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
200 kunmap_flush_on_unmap(addr);
206 static inline unsigned int nr_free_highpages(void) { return 0; }
207 static inline unsigned long totalhigh_pages(void) { return 0UL; }
209 #endif /* CONFIG_HIGHMEM */
212 * Prevent people trying to call kunmap_atomic() as if it were kunmap()
213 * kunmap_atomic() should get the return value of kmap_atomic, not the page.
215 #define kunmap_atomic(__addr) \
217 BUILD_BUG_ON(__same_type((__addr), struct page *)); \
218 __kunmap_atomic(__addr); \
221 #define kunmap_local(__addr) \
223 BUILD_BUG_ON(__same_type((__addr), struct page *)); \
224 __kunmap_local(__addr); \