ARM64 linux kernel virtual address layout
作者：互联网
以下内存布局信息在引导时由Linux内核在我的SoC平台上打印（带有4核Cortex-A53处理器和2.75GiB DRAM）
[ 0.000000] Memory: 2736316K/2883584K available (4796K kernel code, 488K rwdata, 1360K rodata, 448K init, 341K bss, 130884K reserved, 16384K cma-reserved) [ 0.000000] Virtual kernel memory layout: [ 0.000000] modules : 0xffffff8000000000 - 0xffffff8008000000 ( 128 MB) [ 0.000000] vmalloc : 0xffffff8008000000 - 0xffffffbebfff0000 ( 250 GB) [ 0.000000] .text : 0xffffff8008080000 - 0xffffff8008530000 ( 4800 KB) [ 0.000000] .rodata : 0xffffff8008530000 - 0xffffff8008690000 ( 1408 KB) [ 0.000000] .init : 0xffffff8008690000 - 0xffffff8008700000 ( 448 KB) [ 0.000000] .data : 0xffffff8008700000 - 0xffffff800877a200 ( 489 KB) [ 0.000000] .bss : 0xffffff800877a200 - 0xffffff80087cf76c ( 342 KB) [ 0.000000] fixed : 0xffffffbefe7fd000 - 0xffffffbefec00000 ( 4108 KB) [ 0.000000] PCI I/O : 0xffffffbefee00000 - 0xffffffbeffe00000 ( 16 MB) [ 0.000000] vmemmap : 0xffffffbf00000000 - 0xffffffc000000000 ( 4 GB maximum) [ 0.000000] 0xffffffbf00000000 - 0xffffffbf02c00000 ( 44 MB actual) [ 0.000000] memory : 0xffffffc000000000 - 0xffffffc0b0000000 ( 2816 MB)
使用：CONFIG_ARM64_PAGE_SHIFT=12CONFIG_PGTABLE_LEVELS=3CONFIG_ARM64_VA_BITS=39
总体虚拟内存布局：
--------------------> +--------------------------+
ffff:ffff:ffff:ffff | |
| |
| |
ffff:ffc0:0000:0000 |----- Kernel (512G)-------| <-- PAGE_OFFSET
| |
| |
ffff:ff80:0000:0000 | |
--------------------> +--------------------------+
ffff:ff7f:ffff:ffff |//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
z //////////////////////// z
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
0000:0080:0000:0000 |//////////////////////////|
--------------------> +--------------------------+
0000:007f:ffff:ffff | |
| |
| |
| User (512G) |
| |
| |
0000:0000:0000:0000 | |
--------------------> +--------------------------+
以及内核虚拟内存布局：
ffff:ffff:ffff:ffff +--------------------------+
| |
| |
z z
| |
| |
ffff:ffc0:b000:0000 |--------------------------| 1:b000:0000 +------------------------+
| | | |
| memory (2.75G) | | Physical DRAM (2.75G) |
| | | |
ffff:ffc0:0000:0000 +==========================+ <-- PAGE_OFFSET --> 1:0000:0000 +------------------------+
| |
| |
| |
| vmemmap (4G) |
| +----------------------+ |
| | actual (44M) | |
ffff:ffbf:0000:0000 +--------------------------+
|//////////////////////////|
ffff:ffbe:ffe0:0000 +--------------------------+
| PCI I/O (16M) |
ffff:ffbe:fee0:0000 +--------------------------+
|//////////////////////////|
ffff:ffbe:fec0:0000 +--------------------------+
| fixed (4M) |
ffff:ffbe:fe7f:d000 +--------------------------+
|//////////////////////////|
ffff:ffbe:bfff:0000 +--------------------------+
| |
| |
| |
| |
| |
| |
z vmalloc (250G) z
| |
| |
| |
| |
| |
| |
ffff:ff80:087c:f76c | +----------------------+ |
| | .bss | |
| | .data | |
| | .init | | Kernel
| | .rodata | |
| | .text | |
ffff:ff80:0808:0000 | +----------------------+ |
ffff:ff80:0800:0000 +--------------------------+
| modules (128M) |
ffff:ff80:0000:0000 +--------------------------+
from:
https://www.coder.work/article/1883139
标签：kernel,0000,0.000000,KB,ffff,+--------------------------+,linux,layout,ffbe 来源： https://www.cnblogs.com/aspirs/p/15361833.html