dmidecode在哪里获取SMBIOS表?

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问题描述

我总是有这个问题，在阅读手册页并在线搜索后没有得到答案.对此有所了解的人请发表评论.

I always have this question and didn't get an answer after reading man-page and searching online. Anyone who has knowledge about this please comment.

我知道dmidecode定位并解析SMBIOS表或DMI表.但是它是从哪里得到的呢?在Linux中是文件格式吗?

I understand that SMBIOS table or DMI table is what dmidecode locates and parses. But where does it get it from? Is it in the format of a file in Linux?

推荐答案

它似乎来自/dev/mem

Looks like it comes from /dev/mem

root@aw42e ~]# strace -F -e open dmidecode -t 17
   <snip>
    open("/sys/firmware/efi/systab", O_RDONLY) = -1 ENOENT (No such file or directory)
    open("/proc/efi/systab", O_RDONLY)      = -1 ENOENT (No such file or directory)
    open("/dev/mem", O_RDONLY)              = 3
    SMBIOS 2.5 present.

    open("/dev/mem", O_RDONLY)              = 3
    Handle 0x0016, DMI type 17, 27 bytes
    Memory Device
<snip>

/dev/mem 被描述为

要回答，它包含在/dev/mem

So to answer, it is contained in /dev/mem

我正在搜索更多信息，但是我假设内核在启动时将DMI表插入内存中-来自 man dmidecode

I'm searching for more info, but I assume that the kernel inserts the DMI table into memory at boot time - from man dmidecode

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