diff options
Diffstat (limited to 'arch/m68k/include/asm/page_mm.h')
| -rw-r--r-- | arch/m68k/include/asm/page_mm.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/page_mm.h b/arch/m68k/include/asm/page_mm.h new file mode 100644 index 000000000..e6b759921 --- /dev/null +++ b/arch/m68k/include/asm/page_mm.h @@ -0,0 +1,174 @@ +/* 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. + */ +#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) +#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) + +extern int m68k_virt_to_node_shift; + +#ifdef CONFIG_SINGLE_MEMORY_CHUNK +#define __virt_to_node(addr) (&pg_data_map[0]) +#else +extern struct pglist_data *pg_data_table[]; + +static inline __attribute_const__ int __virt_to_node_shift(void) +{ + int shift; + + asm ( + "1: moveq #0,%0\n" + m68k_fixup(%c1, 1b) + : "=d" (shift) + : "i" (m68k_fixup_vnode_shift)); + return shift; +} + +#define __virt_to_node(addr) (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()]) +#endif + +#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 pfn_to_page(pfn) ({ \ + unsigned long __pfn = (pfn); \ + struct pglist_data *pgdat; \ + pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn)); \ + pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn); \ +}) +#define page_to_pfn(_page) ({ \ + const struct page *__p = (_page); \ + struct pglist_data *pgdat; \ + pgdat = &pg_data_map[page_to_nid(__p)]; \ + ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn; \ +}) + +#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__ */ + +#endif /* _M68K_PAGE_MM_H */ |