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Diffstat (limited to 'include/asm-m68k/page.h')
| -rw-r--r-- | include/asm-m68k/page.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/include/asm-m68k/page.h b/include/asm-m68k/page.h new file mode 100644 index 00000000000..99a51670921 --- /dev/null +++ b/include/asm-m68k/page.h @@ -0,0 +1,195 @@ +#ifndef _M68K_PAGE_H +#define _M68K_PAGE_H + +#include <linux/config.h> + +/* PAGE_SHIFT determines the page size */ +#ifndef CONFIG_SUN3 +#define PAGE_SHIFT (12) +#else +#define PAGE_SHIFT (13) +#endif +#ifdef __ASSEMBLY__ +#define PAGE_SIZE (1 << PAGE_SHIFT) +#else +#define PAGE_SIZE (1UL << PAGE_SHIFT) +#endif +#define PAGE_MASK (~(PAGE_SIZE-1)) + +#ifdef __KERNEL__ + +#include <asm/setup.h> + +#if PAGE_SHIFT < 13 +#define THREAD_SIZE (8192) +#else +#define THREAD_SIZE PAGE_SIZE +#endif + +#ifndef __ASSEMBLY__ + +#define get_user_page(vaddr) __get_free_page(GFP_KERNEL) +#define free_user_page(page, addr) free_page(addr) + +/* + * 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) + +/* + * These are used to make use of C type-checking.. + */ +typedef struct { unsigned long pte; } pte_t; +typedef struct { unsigned long pmd[16]; } pmd_t; +typedef struct { unsigned long pgd; } pgd_t; +typedef struct { unsigned long pgprot; } pgprot_t; + +#define pte_val(x) ((x).pte) +#define pmd_val(x) ((&x)->pmd[0]) +#define pgd_val(x) ((x).pgd) +#define pgprot_val(x) ((x).pgprot) + +#define __pte(x) ((pte_t) { (x) } ) +#define __pmd(x) ((pmd_t) { (x) } ) +#define __pgd(x) ((pgd_t) { (x) } ) +#define __pgprot(x) ((pgprot_t) { (x) } ) + +/* to align the pointer to the (next) page boundary */ +#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) + +/* Pure 2^n version of get_order */ +static inline int get_order(unsigned long size) +{ + int order; + + size = (size-1) >> (PAGE_SHIFT-1); + order = -1; + do { + size >>= 1; + order++; + } while (size); + return order; +} + +#endif /* !__ASSEMBLY__ */ + +#include <asm/page_offset.h> + +#define PAGE_OFFSET (PAGE_OFFSET_RAW) + +#ifndef __ASSEMBLY__ + +#ifndef CONFIG_SUN3 + +#define WANT_PAGE_VIRTUAL +#ifdef CONFIG_SINGLE_MEMORY_CHUNK +extern unsigned long m68k_memoffset; + +#define __pa(vaddr) ((unsigned long)(vaddr)+m68k_memoffset) +#define __va(paddr) ((void *)((unsigned long)(paddr)-m68k_memoffset)) +#else +#define __pa(vaddr) virt_to_phys((void *)vaddr) +#define __va(paddr) phys_to_virt((unsigned long)paddr) +#endif + +#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. + */ +#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) +#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) + +#define virt_to_page(kaddr) (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT)) +#define page_to_virt(page) ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET) + +#define pfn_to_page(pfn) virt_to_page(pfn_to_virt(pfn)) +#define page_to_pfn(page) virt_to_pfn(page_to_virt(page)) + +#define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) +#define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) + +#endif /* __ASSEMBLY__ */ + +#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#endif /* __KERNEL__ */ + +#endif /* _M68K_PAGE_H */ |