Date: Tue, 17 Jul 2001 14:30:07 -0700 From: Mike Smith <msmith@freebsd.org> To: mark tinguely <tinguely@web.cs.ndsu.NoDak.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: BIOS reading physical RAM Message-ID: <200107172130.f6HLUFJ02145@mass.dis.org> In-Reply-To: Your message of "Tue, 17 Jul 2001 16:10:01 CDT." <200107172110.f6HLA1s14278@web.cs.ndsu.NoDak.edu>
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>
> Does anyone have a reference to the values of "type" field in the Intel
> BIOS physical system RAM mapping?
>
> I am curious why we are using only entries of type "0x01".
This table (from Ralf Brown's Interrupt List) is self-explanatory:
Values for System Memory Map address type:
01h memory, available to OS
02h reserved, not available (e.g. system ROM, memory-mapped device)
03h ACPI Reclaim Memory (usable by OS after reading ACPI tables)
04h ACPI NVS Memory (OS is required to save this memory between NVS
sessions)
other not defined yet -- treat as Reserved
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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