mirror of https://gitee.com/openkylin/linux.git
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
#ifndef __VIRT_CONVERT__
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#define __VIRT_CONVERT__
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/*
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* Macros used for converting between virtual and physical mappings.
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*/
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#ifdef __KERNEL__
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#include <linux/config.h>
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#include <linux/compiler.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#ifdef CONFIG_AMIGA
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#include <asm/amigahw.h>
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#endif
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/*
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* Change virtual addresses to physical addresses and vv.
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*/
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#ifndef CONFIG_SUN3
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extern unsigned long mm_vtop(unsigned long addr) __attribute_const__;
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extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
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#else
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static inline unsigned long mm_vtop(unsigned long vaddr)
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{
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return __pa(vaddr);
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}
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static inline unsigned long mm_ptov(unsigned long paddr)
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{
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return (unsigned long)__va(paddr);
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}
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#endif
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#ifdef CONFIG_SINGLE_MEMORY_CHUNK
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static inline unsigned long virt_to_phys(void *vaddr)
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{
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return (unsigned long)vaddr - PAGE_OFFSET + m68k_memory[0].addr;
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}
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static inline void * phys_to_virt(unsigned long paddr)
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{
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return (void *)(paddr - m68k_memory[0].addr + PAGE_OFFSET);
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}
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#else
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static inline unsigned long virt_to_phys(void *address)
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{
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return mm_vtop((unsigned long)address);
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}
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static inline void *phys_to_virt(unsigned long address)
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{
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return (void *) mm_ptov(address);
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}
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#endif
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/* Permanent address of a page. */
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#define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
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#define page_to_phys(page) virt_to_phys((void *)__page_address(page))
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/*
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* IO bus memory addresses are 1:1 with the physical address,
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* except on the PCI bus of the Hades.
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*/
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#ifdef CONFIG_HADES
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#define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
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#define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
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#else
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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#endif
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#endif
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#endif
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