Date: Tue, 9 Oct 2001 19:37:41 -0500 (CDT) From: Jonathan Lemon <jlemon@flugsvamp.com> To: gene@nttmcl.com, hackers@freebsd.org Subject: Re: VM question (I hate Intel 810/815 chipsets...) Message-ID: <200110100037.f9A0bfv40852@prism.flugsvamp.com> In-Reply-To: <local.mail.freebsd-hackers/20011009165735.A22544@alicia.nttmcl.com>
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In article <local.mail.freebsd-hackers/20011009165735.A22544@alicia.nttmcl.com> you write:
>What would be the best way to allocate:
>
>1) a VM page whose physical address falls within a certain boundary, and
>2) a VM object whose pages are contiguous in physical address space?
>
>Background:
>The !@*%^*!&#^%*&!#^$!@ Intel 810/815 graphics controller requires its
>instruction and hardware cursor buffers to reside within first 32MB and
>512MB of *physical* memory space respectively. :( :( ;( The XFree86
>driver assumes the Linux memory model (virtual addr == physical addr),
>so it runs on Linux, but not always on FreeBSD.
You probably want contigmalloc(), which allocates a range of memory
which is physically contiguous. (assuming this is a in-kernel driver)
void *
contigmalloc(
unsigned long size, /* should be size_t here and for malloc() */
struct malloc_type *type,
int flags,
unsigned long low,
unsigned long high,
unsigned long alignment,
unsigned long boundary)
--
Jonathan
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