virtconvert.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- #ifndef __VIRT_CONVERT__
- #define __VIRT_CONVERT__
- /*
- * Macros used for converting between virtual and physical mappings.
- */
- #ifdef __KERNEL__
- #include <linux/config.h>
- #include <asm/setup.h>
- #include <asm/page.h>
- #ifdef CONFIG_AMIGA
- #include <asm/amigahw.h>
- #endif
- /*
- * Change virtual addresses to physical addresses and vv.
- */
- #ifndef CONFIG_SUN3
- extern unsigned long mm_vtop(unsigned long addr) __attribute__ ((const));
- extern unsigned long mm_vtop_fallback (unsigned long) __attribute__ ((const));
- extern unsigned long mm_ptov(unsigned long addr) __attribute__ ((const));
- #else
- extern inline unsigned long mm_vtop(unsigned long vaddr)
- {
- return __pa(vaddr);
- }
- extern inline unsigned long mm_ptov(unsigned long paddr)
- {
- return (unsigned long)__va(paddr);
- }
- #endif
- #ifdef CONFIG_SINGLE_MEMORY_CHUNK
- extern inline unsigned long virt_to_phys(volatile void *vaddr)
- {
- unsigned long voff = (unsigned long)vaddr - PAGE_OFFSET;
- if (voff < m68k_memory[0].size)
- return voff + m68k_memory[0].addr;
- return mm_vtop_fallback((unsigned long)vaddr);
- }
- extern inline void * phys_to_virt(unsigned long paddr)
- {
- unsigned long poff = paddr - m68k_memory[0].addr;
- if (poff < m68k_memory[0].size)
- return (void *)(poff + PAGE_OFFSET);
- #ifdef CONFIG_AMIGA
- /*
- * if on an amiga and address is in first 16M, move it
- * to the ZTWO_VADDR range
- */
- if (MACH_IS_AMIGA && paddr < 16*1024*1024)
- return (void *)ZTWO_VADDR(paddr);
- #endif
- return (void *)paddr;
- }
- #else
- extern inline unsigned long virt_to_phys(volatile void * address)
- {
- return mm_vtop((unsigned long)address);
- }
- extern inline void * phys_to_virt(unsigned long address)
- {
- return (void *) mm_ptov(address);
- }
- #endif
- /*
- * IO bus memory addresses are 1:1 with the physical address,
- * except on the PCI bus of the Hades.
- */
- #ifdef CONFIG_HADES
- #define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
- #define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
- #else
- #define virt_to_bus virt_to_phys
- #define bus_to_virt phys_to_virt
- #endif
- #endif
- #endif