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/* SPDX-License-Identifier: GPL-2.0 / #ifndef _LINUX_HIGHMEM_H #define _LINUX_HIGHMEM_H #include <linux/fs.h> #include <linux/kernel.h> #include <linux/bug.h> #include <linux/mm.h> #include <linux/uaccess.h> #include <linux/hardirq.h> #include <asm/cacheflush.h> #ifndef ARCH_HAS_FLUSH_ANON_PAGE static inline void flush_anon_page(struct vm_area_struct vma, struct page page, unsigned long vmaddr) { } #endif #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE static inline void flush_kernel_dcache_page(struct page page) { } static inline void flush_kernel_vmap_range(void vaddr, int size) { } static inline void invalidate_kernel_vmap_range(void vaddr, int size) { } #endif #include <asm/kmap_types.h> #ifdef CONFIG_HIGHMEM #include <asm/highmem.h> /* declarations for linux/mm/highmem.c / unsigned int nr_free_highpages(void); extern atomic_long_t _totalhigh_pages; static inline unsigned long totalhigh_pages(void) { return (unsigned long)atomic_long_read(&_totalhigh_pages); } static inline void totalhigh_pages_inc(void) { atomic_long_inc(&_totalhigh_pages); } static inline void totalhigh_pages_dec(void) { atomic_long_dec(&_totalhigh_pages); } static inline void totalhigh_pages_add(long count) { atomic_long_add(count, &_totalhigh_pages); } static inline void totalhigh_pages_set(long val) { atomic_long_set(&_totalhigh_pages, val); } void kmap_flush_unused(void); struct page kmap_to_page(void addr); #else / CONFIG_HIGHMEM / static inline unsigned int nr_free_highpages(void) { return 0; } static inline struct page kmap_to_page(void addr) { return virt_to_page(addr); } static inline unsigned long totalhigh_pages(void) { return 0UL; } #ifndef ARCH_HAS_KMAP static inline void kmap(struct page page) { might_sleep(); return page_address(page); } static inline void kunmap(struct page page) { } static inline void kmap_atomic(struct page page) { preempt_disable(); pagefault_disable(); return page_address(page); } #define kmap_atomic_prot(page, prot) kmap_atomic(page) static inline void __kunmap_atomic(void addr) { pagefault_enable(); preempt_enable(); } #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) #define kmap_flush_unused() do {} while(0) #endif #endif / CONFIG_HIGHMEM / #if defined(CONFIG_HIGHMEM) \|\| defined(CONFIG_X86_32) DECLARE_PER_CPU(int, __kmap_atomic_idx); static inline int kmap_atomic_idx_push(void) { int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; #ifdef CONFIG_DEBUG_HIGHMEM WARN_ON_ONCE(in_irq() && !irqs_disabled()); BUG_ON(idx >= KM_TYPE_NR); #endif return idx; } static inline int kmap_atomic_idx(void) { return __this_cpu_read(__kmap_atomic_idx) - 1; } static inline void kmap_atomic_idx_pop(void) { #ifdef CONFIG_DEBUG_HIGHMEM int idx = __this_cpu_dec_return(__kmap_atomic_idx); BUG_ON(idx < 0); #else __this_cpu_dec(__kmap_atomic_idx); #endif } #endif / * Prevent people trying to call kunmap_atomic() as if it were kunmap() * kunmap_atomic() should get the return value of kmap_atomic, not the page. / #define kunmap_atomic(addr) \ do { \ BUILD_BUG_ON(__same_type((addr), struct page )); \ __kunmap_atomic(addr); \ } while (0) /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page / #ifndef clear_user_highpage static inline void clear_user_highpage(struct page page, unsigned long vaddr) { void addr = kmap_atomic(page); clear_user_page(addr, vaddr, page); kunmap_atomic(addr); } #endif #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE /* * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE * @vma: The VMA the page is to be allocated for * @vaddr: The virtual address the page will be inserted into * * This function will allocate a page for a VMA but the caller is expected * to specify via movableflags whether the page will be movable in the * future or not * * An architecture may override this function by defining * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own * implementation. / static inline struct page __alloc_zeroed_user_highpage(gfp_t movableflags, struct vm_area_struct vma, unsigned long vaddr) { struct page page = alloc_page_vma(GFP_HIGHUSER \| movableflags, vma, vaddr); if (page) clear_user_highpage(page, vaddr); return page; } #endif /** * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move * @vma: The VMA the page is to be allocated for * @vaddr: The virtual address the page will be inserted into * * This function will allocate a page for a VMA that the caller knows will * be able to migrate in the future using move_pages() or reclaimed / static inline struct page alloc_zeroed_user_highpage_movable(struct vm_area_struct vma, unsigned long vaddr) { return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); } static inline void clear_highpage(struct page page) { void kaddr = kmap_atomic(page); clear_page(kaddr); kunmap_atomic(kaddr); } static inline void zero_user_segments(struct page page, unsigned start1, unsigned end1, unsigned start2, unsigned end2) { void kaddr = kmap_atomic(page); BUG_ON(end1 > PAGE_SIZE \|\| end2 > PAGE_SIZE); if (end1 > start1) memset(kaddr + start1, 0, end1 - start1); if (end2 > start2) memset(kaddr + start2, 0, end2 - start2); kunmap_atomic(kaddr); flush_dcache_page(page); } static inline void zero_user_segment(struct page page, unsigned start, unsigned end) { zero_user_segments(page, start, end, 0, 0); } static inline void zero_user(struct page page, unsigned start, unsigned size) { zero_user_segments(page, start, start + size, 0, 0); } #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE static inline void copy_user_highpage(struct page to, struct page from, unsigned long vaddr, struct vm_area_struct vma) { char vfrom, vto; vfrom = kmap_atomic(from); vto = kmap_atomic(to); copy_user_page(vto, vfrom, vaddr, to); kunmap_atomic(vto); kunmap_atomic(vfrom); } #endif #ifndef __HAVE_ARCH_COPY_HIGHPAGE static inline void copy_highpage(struct page to, struct page from) { char vfrom, vto; vfrom = kmap_atomic(from); vto = kmap_atomic(to); copy_page(vto, vfrom); kunmap_atomic(vto); kunmap_atomic(vfrom); } #endif static inline void memcpy_from_page(char to, struct page page, size_t offset, size_t len) { char from = kmap_atomic(page); memcpy(to, from + offset, len); kunmap_atomic(from); } static inline void memcpy_to_page(struct page page, size_t offset, const char from, size_t len) { char to = kmap_atomic(page); memcpy(to + offset, from, len); kunmap_atomic(to); } #endif /* _LINUX_HIGHMEM_H */

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