diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2017-12-23 04:45:22 +0100 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2017-12-23 04:45:22 +0100 |
| commit | 9c6897e848933b1cb256416987c55d0a12f6e3bd (patch) | |
| tree | eb21e93ac66779a9ecadef4daaaafc649f6c40e8 /sys/man | |
| parent | 96eb90fba188f73d2172f8e8de6a96be85b6d823 (diff) | |
arch(3): document #P/realmodemem file
Diffstat (limited to 'sys/man')
| -rw-r--r-- | sys/man/3/arch | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/man/3/arch b/sys/man/3/arch index fd28462ad..621836353 100644 --- a/sys/man/3/arch +++ b/sys/man/3/arch @@ -15,6 +15,7 @@ arch \- architecture-specific information and control .B /dev/iow .B /dev/irqalloc .B /dev/msr +.B /dev/realmodemem .SH DESCRIPTION This device presents textual information about PC hardware and allows user-level control of the I/O ports on x86-class machines. @@ -129,6 +130,12 @@ Reads and writes to .I msr go to the P4/P6/Core/Core2/AMD64 MSRs. .PP +The +.I realmodemem +file provides access to the first megabyte of memory. This +allows reading BIOS data structures and option ROMs. +Writing is limited to the VGA framebuffer at [0xA0000-0xBFFFF]. +.PP Reads and writes to .I ec transfer bytes from and to the embedded controller. |