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Date: Sun, 27 Feb 2005 08:40:16 +0800
From: David Xu <davidxu@freebsd.org>
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To: Olivier Houchard <cognet@freebsd.org>
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Subject: Re: cvs commit: src/sys/arm/include machdep.h pmap.h sysarch.h  
 src/sys/arm/arm cpufunc_asm.S genassym.c machdep.c pmap.c swtch.S 
 src/sys/arm/xscale std.xscale src/sys/arm/xscale/i80321 std.i80321
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I am thinking why you can finish the task in such short time. :=)

Should sysarch(ARM_SET_TP,...) write the thread pointer to
ARM_TP_ADDRESS now not just remembers it or did I miss
something ?

David Xu

Olivier Houchard wrote:

>cognet      2005-02-26 18:59:01 UTC
>
>  FreeBSD src repository
>
>  Modified files:
>    sys/arm/include      sysarch.h pmap.h machdep.h 
>    sys/arm/arm          cpufunc_asm.S genassym.c machdep.c pmap.c 
>                         swtch.S 
>    sys/arm/xscale/i80321 std.i80321 
>  Added files:
>    sys/arm/xscale       std.xscale 
>  Log:
>  Instead of using sysarch() to store-retrieve the tp, add a magic address,
>  ARM_TP_ADDRESS, where the tp will be stored. On CPUs that support it, a cache
>  line will be allocated and locked for this address, so that it will never go
>  to RAM. On CPUs that does not, a page is allocated for it (it will be a bit
>  slower, and is wrong for SMP, but should be fine for UP).
>  The tp is still stored in the mdthread struct, and at each context switch,
>  ARM_TP_ADDRESS gets updated.
>  
>  Suggested by:   davidxu
>  
>