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