linux-2.6.33/__arm_ioremap_pfn()(arm) の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-2.6.33/__arm_ioremap_pfn()(arm) へ行く。
• linux-2.6.33/__arm_ioremap_pfn()(arm) の差分を削除

*参照元 [#rbaa18bd]
#backlinks

*説明 [#pa38e088]
-パス: [[linux-2.6.33/arch/arm/mm/ioremap.c]]

-FIXME: これは何？
--説明


**引数 [#h875a9e8]
-unsigned long pfn
--
-unsigned long offset
--
-size_t size
--
-unsigned int mtype
--


**返り値 [#w6b5e815]
-void __iomem *
--
--[[linux-2.6.33/__iomem]]


**参考 [#j8f93111]


*実装 [#oc484937]
 /*
  * Remap an arbitrary physical address space into the kernel virtual
  * address space. Needed when the kernel wants to access high addresses
  * directly.
  *
  * NOTE! We need to allow non-page-aligned mappings too: we will obviously
  * have to convert them into an offset in a page-aligned mapping, but the
  * caller shouldn't need to know that small detail.
  *
  * 'flags' are the extra L_PTE_ flags that you want to specify for this
  * mapping.  See <asm/pgtable.h> for more information.
  */
 void __iomem *
 __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
 		  unsigned int mtype)
 {
 	const struct mem_type *type;
 	int err;
 	unsigned long addr;
  	struct vm_struct * area;
 
-
--[[linux-2.6.33/mem_type]]
-
--[[linux-2.6.33/vm_struct]]

 	/*
 	 * High mappings must be supersection aligned
 	 */
 	if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
 		return NULL;
 
-
--[[linux-2.6.33/__pfn_to_phys()]]
-
--[[linux-2.6.33/SUPERSECTION_MASK]]

 	type = get_mem_type(mtype);
 	if (!type)
 		return NULL;
 
-
--[[linux-2.6.33/get_mem_type()]]

 	/*
 	 * Page align the mapping size, taking account of any offset.
 	 */
 	size = PAGE_ALIGN(offset + size);
 
-
--[[linux-2.6.33/PAGE_ALIGN()]]

  	area = get_vm_area(size, VM_IOREMAP);
  	if (!area)
  		return NULL;
  	addr = (unsigned long)area->addr;
 
-
--[[linux-2.6.33/get_vm_area()]]
-
--[[linux-2.6.33/VM_IOREMAP]]

 #ifndef CONFIG_SMP
-smp 向けではないとき。
--[[linux-2.6.33/CONFIG_SMP]]

 	if (DOMAIN_IO == 0 &&
 	    (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
 	       cpu_is_xsc3()) && pfn >= 0x100000 &&
 	       !((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) {
-
--[[linux-2.6.33/DOMAIN_IO]]
-
--[[linux-2.6.33/cpu_architecture()]]
-
--[[linux-2.6.33/CPU_ARCH_ARMV6]]
-
--[[linux-2.6.33/get_cr()]]
-
--[[linux-2.6.33/CR_XP]]
-
--[[linux-2.6.33/cpu_is_xsc3()]]
-
--[[linux-2.6.33/__pfn_to_phys()]]
-
--[[linux-2.6.33/SUPERSECTION_MASK]]

 		area->flags |= VM_ARM_SECTION_MAPPING;
 		err = remap_area_supersections(addr, pfn, size, type);
-
--[[linux-2.6.33/VM_ARM_SECTION_MAPPING]]
-
--[[linux-2.6.33/remap_area_supersections()]]

 	} else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) {
-
--[[linux-2.6.33/PMD_MASK]]

 		area->flags |= VM_ARM_SECTION_MAPPING;
 		err = remap_area_sections(addr, pfn, size, type);
-
--[[linux-2.6.33/VM_ARM_SECTION_MAPPING]]
-
--[[linux-2.6.33/remap_area_sections()]]

 	} else
 #endif
 		err = remap_area_pages(addr, pfn, size, type);
 
-
--[[linux-2.6.33/remap_area_pages()]]

 	if (err) {
  		vunmap((void *)addr);
  		return NULL;
-
--[[linux-2.6.33/vunmap()]]

  	}
 
 	flush_cache_vmap(addr, addr + size);
 	return (void __iomem *) (offset + addr);
-
--[[linux-2.6.33/flush_cache_vmap()]]

 }
 EXPORT_SYMBOL(__arm_ioremap_pfn);
-特にライセンスを区別せずシンボルを公開する。
--[[linux-2.6.33/EXPORT_SYMBOL()]]


*コメント [#b7e2091d]