182 lines
4.4 KiB
C
182 lines
4.4 KiB
C
#ifndef _M68K_PAGE_H
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#define _M68K_PAGE_H
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/* PAGE_SHIFT determines the page size */
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#ifndef CONFIG_SUN3
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#define PAGE_SHIFT (12)
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#else
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#define PAGE_SHIFT (13)
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#endif
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#ifdef __ASSEMBLY__
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#else
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#endif
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#ifdef __KERNEL__
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#include <asm/setup.h>
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#if PAGE_SHIFT < 13
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#define THREAD_SIZE (8192)
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#else
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#define THREAD_SIZE PAGE_SIZE
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#endif
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#ifndef __ASSEMBLY__
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#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
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#define free_user_page(page, addr) free_page(addr)
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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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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pmd[16]; } pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pte_val(x) ((x).pte)
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#define pmd_val(x) ((&x)->pmd[0])
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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#endif /* !__ASSEMBLY__ */
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#include <asm/page_offset.h>
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#define PAGE_OFFSET (PAGE_OFFSET_RAW)
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#ifndef __ASSEMBLY__
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#ifndef CONFIG_SUN3
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#define WANT_PAGE_VIRTUAL
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#ifdef CONFIG_SINGLE_MEMORY_CHUNK
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extern unsigned long m68k_memoffset;
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#define __pa(vaddr) ((unsigned long)(vaddr)+m68k_memoffset)
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#define __va(paddr) ((void *)((unsigned long)(paddr)-m68k_memoffset))
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#else
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#define __pa(vaddr) virt_to_phys((void *)(vaddr))
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#define __va(paddr) phys_to_virt((unsigned long)(paddr))
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#endif
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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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#define virt_to_page(kaddr) (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT))
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#define page_to_virt(page) ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
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#define pfn_to_page(pfn) virt_to_page(pfn_to_virt(pfn))
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#define page_to_pfn(page) virt_to_pfn(page_to_virt(page))
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#define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < 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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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#endif /* __KERNEL__ */
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#include <asm-generic/page.h>
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#endif /* _M68K_PAGE_H */
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