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usr
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src
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linux-headers-6.8.0-83-generic
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arch
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m68k
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include
/
asm
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page_mm.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _M68K_PAGE_MM_H #define _M68K_PAGE_MM_H #ifndef __ASSEMBLY__ #include <linux/compiler.h> #include <asm/module.h> /* * We don't need to check for alignment etc. */ #ifdef CPU_M68040_OR_M68060_ONLY static inline void copy_page(void *to, void *from) { unsigned long tmp; __asm__ __volatile__("1:\t" ".chip 68040\n\t" "move16 %1@+,%0@+\n\t" "move16 %1@+,%0@+\n\t" ".chip 68k\n\t" "dbra %2,1b\n\t" : "=a" (to), "=a" (from), "=d" (tmp) : "0" (to), "1" (from), "2" (PAGE_SIZE / 32 - 1)); } static inline void clear_page(void *page) { unsigned long tmp; unsigned long *sp = page; *sp++ = 0; *sp++ = 0; *sp++ = 0; *sp++ = 0; __asm__ __volatile__("1:\t" ".chip 68040\n\t" "move16 %2@+,%0@+\n\t" ".chip 68k\n\t" "subqw #8,%2\n\t" "subqw #8,%2\n\t" "dbra %1,1b\n\t" : "=a" (sp), "=d" (tmp) : "a" (page), "0" (sp), "1" ((PAGE_SIZE - 16) / 16 - 1)); } #else #define clear_page(page) memset((page), 0, PAGE_SIZE) #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) #endif #define clear_user_page(addr, vaddr, page) \ do { clear_page(addr); \ flush_dcache_page(page); \ } while (0) #define copy_user_page(to, from, vaddr, page) \ do { copy_page(to, from); \ flush_dcache_page(page); \ } while (0) extern unsigned long m68k_memoffset; #ifndef CONFIG_SUN3 #define WANT_PAGE_VIRTUAL static inline unsigned long ___pa(void *vaddr) { unsigned long paddr; asm ( "1: addl #0,%0\n" m68k_fixup(%c2, 1b+2) : "=r" (paddr) : "0" (vaddr), "i" (m68k_fixup_memoffset)); return paddr; } #define __pa(vaddr) ___pa((void *)(long)(vaddr)) static inline void *__va(unsigned long paddr) { void *vaddr; asm ( "1: subl #0,%0\n" m68k_fixup(%c2, 1b+2) : "=r" (vaddr) : "0" (paddr), "i" (m68k_fixup_memoffset)); return vaddr; } #else /* !CONFIG_SUN3 */ /* This #define is a horrible hack to suppress lots of warnings. --m */ #define __pa(x) ___pa((unsigned long)(x)) static inline unsigned long ___pa(unsigned long x) { if (x == 0) return 0; if (x >= PAGE_OFFSET) return (x - PAGE_OFFSET); else return (x + 0x2000000); } static inline void *__va(unsigned long x) { if (x == 0) return (void *)0; if (x < 0x2000000) return (void *)(x + PAGE_OFFSET); else return (void *)(x - 0x2000000); } #endif /* CONFIG_SUN3 */ /* * NOTE: virtual isn't really correct, actually it should be the offset into the * memory node, but we have no highmem, so that works for now. * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots * of the shifts unnecessary. */ static inline unsigned long virt_to_pfn(const void *kaddr) { return __pa(kaddr) >> PAGE_SHIFT; } static inline void *pfn_to_virt(unsigned long pfn) { return __va(pfn << PAGE_SHIFT); } extern int m68k_virt_to_node_shift; #define virt_to_page(addr) ({ \ pfn_to_page(virt_to_pfn(addr)); \ }) #define page_to_virt(page) ({ \ pfn_to_virt(page_to_pfn(page)); \ }) #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT) #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) #endif /* __ASSEMBLY__ */ #endif /* _M68K_PAGE_MM_H */
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