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linux kernel的virtual kernel memory layout介绍(aarch64)

  • 2026-07-02 00:19:42
linux kernel的virtual kernel memory layout介绍(aarch64)

相关文件:memory.hpgtable.hfixmap.hpage.h

1、重要的配置

我们就以 VA_BITS=48,PAGE_SIZE=4k 来介绍

(1)、(VA_BITS)

(arch/arm64/Kconfig)

config ARM64_VA_BITS_36bool"36-bit"if EXPERT	depends on ARM64_16K_PAGESconfig ARM64_VA_BITS_39bool"39-bit"	depends on ARM64_4K_PAGESconfig ARM64_VA_BITS_42bool"42-bit"	depends on ARM64_64K_PAGESconfig ARM64_VA_BITS_47bool"47-bit"	depends on ARM64_16K_PAGESconfig ARM64_VA_BITS_48bool"48-bit"
CONFIG_ARM64_VA_BITS_48=yCONFIG_ARM64_VA_BITS=48

(2)、(PAGE_SIZE、PAGE_SHIFT)

如果选择了 ARM64_4K_PAGES,那么 PAGE_SIZE = 4K,PAGE_SHIFT=12

#ifdef CONFIG_ARM64_64K_PAGES#define PAGE_SHIFT		16#define CONT_SHIFT		5#elif defined(CONFIG_ARM64_16K_PAGES)#define PAGE_SHIFT		14#define CONT_SHIFT		7#else#define PAGE_SHIFT		12#define CONT_SHIFT		4#endif#define PAGE_SIZE		(_AC(1, UL) << PAGE_SHIFT)#define PAGE_MASK		(~(PAGE_SIZE-1))

2、kernel 4.4 代码 : 计算各个区域的地址

(memory.h):

#define VA_BITS			(CONFIG_ARM64_VA_BITS)#define VA_START		(UL(0xffffffffffffffff) - \	(UL(1) << VA_BITS) + 1)#define PAGE_OFFSET		(UL(0xffffffffffffffff) - \	(UL(1) << (VA_BITS - 1)) + 1)#define KIMAGE_VADDR		(MODULES_END)#define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)#define MODULES_VADDR		(VA_START + KASAN_SHADOW_SIZE)#define MODULES_VSIZE		(SZ_128M)#define PCI_IO_END		(PAGE_OFFSET - SZ_2M)#define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)#define FIXADDR_TOP		(PCI_IO_START - SZ_2M)#define TASK_SIZE_64		(UL(1) << VA_BITS)
#ifdef CONFIG_KASAN#define KASAN_SHADOW_SIZE	(UL(1) << (VA_BITS - 3))#else#define KASAN_SHADOW_SIZE	(0)#endif
#define MODULES_VSIZE		(SZ_128M)#define SZ_128M				0x08000000
#define PCI_IO_SIZE		SZ_16M  //(0x01000000)#define PCI_IO_END		(PAGE_OFFSET - SZ_2M)#define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)

(fixmap.h)

#define FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)

(pgtable.h)

#define VMEMMAP_SIZE		ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE)#define VMALLOC_START		(MODULES_END)#define VMALLOC_END		(PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)#define VMEMMAP_START		(VMALLOC_END + SZ_64K)
KASAN_SHADOW_SIZE = 0x2000_0000_0000MODULES_VSIZE = 0x0800_0000VA_BITS = 48VA_START = 0xffff_0000_0000_0000PAGE_OFFSET = 0xffff_8000_0000_0000MODULES_VADDR=(VA_START + KASAN_SHADOW_SIZE) = 0xffff_2000_0000_0000KIMAGE_VADDR = (MODULES_END) = (MODULES_VADDR + MODULES_VSIZE) = 0xffff_2000_0800_0000KIMAGE_VADDR = 0xffff_2000_0800_0000PCI_IO_END = 0xffff_8000_0000_0000 - 0x0000_0800 = 0xffff_7fff_ffff_e800PCI_IO_START = 0xffff_7fff_ffff_e800 - 0x0100_0000 = 0xffff_7fff_feff_e800FIXADDR_TOP = (PCI_IO_START - SZ_2M) = 0xffff_7fff_feff_e800 - 0x0020_0000 = 0xffff_7fff_fedf_e800 //(end addr)PCI_IO_START = 0xffff_7fff_feff_e800

再看 VMEMMAP_SIZE :(例如 VA_BITS=48, PAGE_SHIFT=12 的情况下)(1UL << (VA_BITS - PAGE_SHIFT)) 表示 48 位的有效虚拟地址,一共可以表示多数个 page 页。再乘以 sizeof(struct page), 表示需要多数内存来存储 struct page也就是说 VMEMMAP 是用来存储所有页面的 struct page 结构体的

结合以上地址,我们画了张图,更直观

3、kernel 4.14 代码 : 计算各个区域的地址

(memory.h):

#define VA_BITS			(CONFIG_ARM64_VA_BITS)#define VA_START		(UL(0xffffffffffffffff) - \	(UL(1) << VA_BITS) + 1)#define PAGE_OFFSET		(UL(0xffffffffffffffff) - \	(UL(1) << (VA_BITS - 1)) + 1)#define KIMAGE_VADDR		(MODULES_END)#define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)#define MODULES_VADDR		(VA_START + KASAN_SHADOW_SIZE)#define MODULES_VSIZE		(SZ_128M)#define VMEMMAP_START		(PAGE_OFFSET - VMEMMAP_SIZE)#define PCI_IO_END		(VMEMMAP_START - SZ_2M)#define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)#define FIXADDR_TOP		(PCI_IO_START - SZ_2M)

同样,我们也画了一张图:

4、kernel image 搬移到 vmalloc 区域后,virt_to_phys 的变化

virt_to_phys 的作用是将内核虚拟地址转换成物理地址(针对线性映射区域)。在 kernel image 还在线性映射区域的时候,virt_to_phys 宏可以将 kernel 代码中的一个地址转换成物理地址,因为线性映射区域,物理地址和虚拟地址只有一个偏移。因此两者很容易转换。那么现在 kernel image 和线性映射区域分开了,virt_to_phys 宏又该如何实现呢?

在 kernel 中 PAGE_OFFSET = 0x8000_0000_0000

#define PAGE_OFFSET		(UL(0xffffffffffffffff) - \	(UL(1) << (VA_BITS - 1)) + 1)

当 virt_to_phys 调用时候,先判断 bit47(最高有效位),如果为 1,则表示是(memory)DRAM 的地址。那么直接使用 X[46:0] 和 PHYS_OFFSET 相加即可

#define __virt_to_phys(x) ({						\phys_addr_t__x = (phys_addr_t)(x);				\	__x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET :	\				 (__x - kimage_voffset); })

PHYS_OFFSET 是 DRAM 的真实物理地址

memstart_addr = round_down(memblock_start_of_DRAM(),				   ARM64_MEMSTART_ALIGN);

当 virt_to_phys 调用时候,先判断 bit47(最高有效位),如果为 0,则表示是 kernel image 的地址, 那么直接使用 X[46:0] 和 kimage_voffset 相减即可

kimage_voffset 来自汇编中的__mmap_switched 函数

str_l	x21, __fdt_pointer, x5		// Save FDT pointerldr_l	x4, kimage_vaddr		// Save the offset betweensub	x4, x4, x24			// the kernel virtual andstr_l	x4, kimage_voffset, x5		// physical mappings

综上所述,virt_to_phys() 当前能够转换的依然还是:线性区域、kimg 区域 (kernel image 区域)

5、PCI/IO 区域

如 X86 处理器为外设专门实现了一个单独的地址空间,称为 "I/O 地址空间" 或者 "I/O 端口空间",CPU 通过专门的 I/O 指令(如 X86 的 IN 和 OUT 指令)来访问这一空间中的地址单元。

在 arm64 中,其实也有类似的指令,只是我们没有用到这个区域,也没有使用这些指令。

具体在 kernel/include/asm-generic/io.h 中:其中 PCI_IOBASE 对应的就是 PCI/IO 的及地址(PCI_IO_START)。

#ifndef insb#define insb insbstaticinlinevoidinsb(unsignedlong addr, void *buffer, unsignedint count){	readsb(PCI_IOBASE + addr, buffer, count);}#endif#ifndef insw#define insw inswstaticinlinevoidinsw(unsignedlong addr, void *buffer, unsignedint count){	readsw(PCI_IOBASE + addr, buffer, count);}#endif#ifndef insl#define insl inslstaticinlinevoidinsl(unsignedlong addr, void *buffer, unsignedint count){	readsl(PCI_IOBASE + addr, buffer, count);}#endif

6、ioremap

那么 ioremap 映射到了哪个区域呢?

(arch/arm64/include/asm/io.h)

#define ioremap(addr, size)		__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))#define ioremap_nocache(addr, size)	__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))#define ioremap_wc(addr, size)		__ioremap((addr), (size), __pgprot(PROT_NORMAL_NC))#define ioremap_wt(addr, size)		__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))#define iounmap				__iounmap

(ioremap.c)

void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot){return __ioremap_caller(phys_addr, size, prot,				__builtin_return_address(0));}EXPORT_SYMBOL(__ioremap);
staticvoid __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,pgprot_t prot, void *caller){unsignedlong last_addr;unsignedlong offset = phys_addr & ~PAGE_MASK;int err;unsignedlong addr;structvm_struct *area;/*	 * Page align the mapping address and size, taking account of any	 * offset.	 */	phys_addr &= PAGE_MASK;	size = PAGE_ALIGN(size + offset);/*	 * Don't allow wraparound, zero size or outside PHYS_MASK.	 */	last_addr = phys_addr + size - 1;if (!size || last_addr < phys_addr || (last_addr & ~PHYS_MASK))returnNULL;/*	 * Don't allow RAM to be mapped.	 */if (WARN_ON(pfn_valid(__phys_to_pfn(phys_addr))))returnNULL;	area = get_vm_area_caller(size, VM_IOREMAP, caller);if (!area)returnNULL;	addr = (unsignedlong)area->addr;	area->phys_addr = phys_addr;	err = ioremap_page_range(addr, addr + size, phys_addr, prot);if (err) {		vunmap((void *)addr);returnNULL;	}return (void __iomem *)(offset + addr);}

调用了 get_vm_area_caller(size, VM_IOREMAP, caller)(vmalloc.c)

struct vm_struct *__get_vm_area_caller(unsignedlong size, unsignedlong flags,unsignedlong start, unsignedlong end,constvoid *caller){return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE,				  GFP_KERNEL, caller);}
staticstruct vm_struct *__get_vm_area_node(unsignedlong size,unsignedlong align, unsignedlong flags, unsignedlong start,unsignedlong end, int node, gfp_t gfp_mask, constvoid *caller){struct vmap_area *va;struct vm_struct *area;	BUG_ON(in_interrupt());if (flags & VM_IOREMAP)		align = 1ul << clamp_t(int, fls_long(size),				       PAGE_SHIFT, IOREMAP_MAX_ORDER);	size = PAGE_ALIGN(size);if (unlikely(!size))returnNULL;	area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);if (unlikely(!area))returnNULL;if (!(flags & VM_NO_GUARD))		size += PAGE_SIZE;	va = alloc_vmap_area(size, align, start, end, node, gfp_mask);if (IS_ERR(va)) {		kfree(area);returnNULL;	}	setup_vmalloc_vm(area, va, flags, caller);return area;}

具体代码不再深究,但可以知道 iorempa 是在 vmalloc 区域分配的

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  1. CONNECT:[ UseTime:0.000463s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000719s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005287s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.027953s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000604s ]
  6. SELECT * FROM `set` [ RunTime:0.000218s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000590s ]
  8. SELECT * FROM `article` WHERE `id` = 497533 LIMIT 1 [ RunTime:0.004995s ]
  9. UPDATE `article` SET `lasttime` = 1783037524 WHERE `id` = 497533 [ RunTime:0.015658s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.014838s ]
  11. SELECT * FROM `article` WHERE `id` < 497533 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005019s ]
  12. SELECT * FROM `article` WHERE `id` > 497533 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005897s ]
  13. SELECT * FROM `article` WHERE `id` < 497533 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.030353s ]
  14. SELECT * FROM `article` WHERE `id` < 497533 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.026942s ]
  15. SELECT * FROM `article` WHERE `id` < 497533 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001539s ]
0.214836s