55 lines
1.2 KiB
C
55 lines
1.2 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/compiler.h>
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#include <linux/mmzone.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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/*
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* Change virtual addresses to physical addresses and vv.
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*/
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static inline unsigned long virt_to_phys(void *address)
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{
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return __pa(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 __va(address);
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}
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/* Permanent address of a page. */
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#ifdef CONFIG_SINGLE_MEMORY_CHUNK
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#define page_to_phys(page) \
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__pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
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#else
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#define page_to_phys(_page) ({ \
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struct page *__page = _page; \
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struct pglist_data *pgdat; \
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pgdat = pg_data_table[page_to_nid(__page)]; \
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page_to_pfn(__page) << PAGE_SHIFT; \
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})
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#endif
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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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