e820是一种BIOS中断调用,当中断号15H被请求,并且操作码AX被设置为E820H时,BIOS会向调用者报告可用的物理地址区间等信息。 这种机制使得操作系统在启动初期能够获取关于物理内存布局的详细信息,包括哪些内存区域是可用的(usable),哪些是保留的(reserved),哪些是映射到ACPI数据或其他特殊用途的。 e820如何提供物理RAM映射...
BIOS-e820: 0000000000100000 - 00000000bdc90000 (usable) BIOS-e820: 00000000bdc90000 - 00000000bdce3000 (ACPI NVS) BIOS-e820: 00000000bdce3000 - 00000000bdcf0000 (ACPI data) BIOS-e820: 00000000bdcf0000 - 00000000bdd00000 (reserved) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS...
而操作系统获取这个表的方法自然就是BIOS的中断调用了。e820调用即可获取这些信息,终端下使用dmesg命令打印内核日志就可以看到内核打印出的物理内存布局了。 简要解释下上面的输出: Usable:是已经被映射到物理内存(DRAM)的物理地址。 Reserved:这些区间是没有被映射到任何地方,不能当作内存来使用。(内核可以修改这些映射,...
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x0000000009d7ffff] usable[ 0.000000] BIOS-e820: [mem 0x000000000a20a000-0x000000000affffff] usable [ 0.000000] BIOS-e820[ 0.000000] BIOS-e820: [mem 0x00000000dd1ec000 浏览0提问于2019-12-15得票数 0 回答已采纳 点击加载更多 扫码 添加站长 ...
BIOS e820_table reports complete memory map to OS, including OS usable memory ranges and BIOS reserved memory ranges etc. x86 BIOS may not be trusted to include RMRR regions as reserved type of memory in its e820 memory map, hence validate every RMRR entry with the e820 memory map to make...
[1923803] legacy rombios - e820 map and ACPI_DATA_SIZE [1936132] Link problem with --enable-debugger & --enable-disasm [1934477] Linear address wrap is not working [1424984] virtual machine freezes in Bochs 2.2.6 [1902928] with debugger cpu_loop leaves CPU with unstable state [1898929] ...
PCI BIOS规范,英文版。具体内容请查看文档。 PCI BIOS规范2009-12-05 上传大小:2.00MB 所需:9积分/C币 Bochs - The cross platform IA-32 (x86) emulator Changes in 2.4.6 (February 22, 2011): Brief summary : - Support more host OS to run on: - Include win64 native binary in the release....
mar 19 02:24:47 vhost.network.ro kernel: BIOS-e820: [mem 0x00000000df62f000-0x00000000df63bfff] ACPI datamar 19 02:24:47 vhost.network.ro kernel: BIOS-e820: [mem 0x00000000df63c000-0x00000000df63cfff] usablemar 19 02:24:47 vhost.network.ro kernel: BIOS-e820: [mem 0x00000...
[ 0.000000] BIOS-e820: 0000000000100000 - 0000000037e70000 (usable) [ 0.000000] BIOS-e820: 0000000037e70000 - 0000000037e80000 (ACPI data) [ 0.000000] BIOS-e820: 0000000037e80000 - 0000000037f00000 (ACPI NVS) [ 0.000000] BIOS-e820: 0000000037f00000 - 0000000040000000 (reserved) ...
mar 19 02:24:47 vhost.network.ro kernel: BIOS-e820: [mem 0x00000000df62f000-0x00000000df63bfff] ACPI datamar 19 02:24:47 vhost.network.ro kernel: BIOS-e820: [mem 0x00000000df63c000-0x00000000df63cfff] usablemar 19 02:24:47 vhost.network.ro kernel: BIOS-e820: [mem 0x00...