Linux 如何在ARM64上解释虚拟内核内存布局？
以下内存布局信息是linux内核在引导时在我的SoC平台（使用4核Cortex-A53处理器和2.75GiB DRAM）上打印的，但我并不完全理解布局的内容：Linux 如何在ARM64上解释虚拟内核内存布局？,linux,arm64,memory-layout,Linux,Arm64,Memory Layout,以下内存布局信息是linux内核在引导时在我的SoC平台（使用4核Cortex-A53处理器和2.75GiB DRAM）上打印的，但我并不完全理解布局的内容： [ 0.000000] Memory: 2736316K/2883584K available (4796K kernel code, 488K rwdata, 1360K rodata, 448K init, 341K bss, 130884K reserved, 16384K cma-reserved) [ 0.00000
[ 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)
非常感谢 在阅读了一些帖子之后，我想出了以下内存映射图 与：
CONFIG\u ARM64\u PAGE\u SHIFT=12CONFIG\u PGTABLE\u LEVELS=3CONFIG\u ARM64\u VA\u BITS=39
--------------------> +--------------------------+
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 | |
--------------------> +--------------------------+
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 +--------------------------+
------------->+--------------------------+
ffff:ffff:ffff:ffff||
| |
| |
ffff:ffc0:0000:0000----内核（512G）------内核+--------------------------+
ffff:ff7f:ffff:ffff|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
z//////////z
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
|//////////////////////////|
0000:0080:0000:0000 |//////////////////////////|
--------------------> +--------------------------+
0000:007f:ffff:ffff||
| |
| |
|用户（512G）|
| |
| |
0000:0000:0000:0000 | |
--------------------> +--------------------------+
--------------------> +--------------------------+
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 | |
--------------------> +--------------------------+
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 +--------------------------+
ffff:ffff:ffff:ffff+--------------------------+
| |
| |
z z
| |
| |
ffff:ffc0:b000:0000 |------------------------------------------1:b000:0000+------------------------+
| | | |
|内存（2.75G）| |物理DRAM（2.75G）|
| | | |
ffff:ffc0:0000:0000+=====================================+1:0000:0000+------------------------+
| |
| |
| |
|vmemmap（4G）|
| +----------------------+ |
||实际（44M）||
ffff:ffbf:0000:0000+--------------------------+
|//////////////////////////|
ffff:ffbe:FF0:0000+--------------------------+
|PCI I/O（16M）|
ffff:ffbe:fee0:0000+--------------------------+
|//////////////////////////|
ffff:ffbe:fec0:0000+--------------------------+
|固定（4米）|
ffff:ffbe:fe7f:d000+--------------------------+
|//////////////////////////|
ffff:ffbe:bfff:0000+--------------------------+
| |
| |
| |
| |
| |
| |
zVMalloc（250G）z
| |
| |
| |
| |
| |
| |
ffff:ff80:087c:f76c |+-----------------------------------+|
|| bss ||
||数据||
||.init | |内核
||罗达塔||
||文本||
ffff:ff80:0808:0000 |+-----------------------------------+|
ffff:ff80:0800:0000+--------------------------+
|模块（128M）|
ffff:ff80:0000:0000+--------------------------+
390xffff:ffc0:0000:0000