Date: Thu, 22 Jan 2009 15:36:12 +0000 (UTC) From: Olivier Houchard <cognet@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r187592 - head/sys/arm/include Message-ID: <200901221536.n0MFaCb0016027@svn.freebsd.org>
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Author: cognet Date: Thu Jan 22 15:36:11 2009 New Revision: 187592 URL: http://svn.freebsd.org/changeset/base/187592 Log: Add a comment explaining what ARM_KERN_DIRECTMAP is all about. Suggested by: raj Modified: head/sys/arm/include/vmparam.h Modified: head/sys/arm/include/vmparam.h ============================================================================== --- head/sys/arm/include/vmparam.h Thu Jan 22 15:35:54 2009 (r187591) +++ head/sys/arm/include/vmparam.h Thu Jan 22 15:36:11 2009 (r187592) @@ -97,6 +97,13 @@ #define VM_MIN_ADDRESS (0x00001000) #ifdef ARM_USE_SMALL_ALLOC +/* + * ARM_KERN_DIRECTMAP is used to make sure there's enough space between + * VM_MAXUSER_ADDRESS and KERNBASE to map the whole memory. + * It has to be a compile-time constant, even if arm_init_smallalloc(), + * which will do the mapping, gets the real amount of memory at runtime, + * because VM_MAXUSER_ADDRESS is a constant. + */ #ifndef ARM_KERN_DIRECTMAP #define ARM_KERN_DIRECTMAP 512 * 1024 * 1024 /* 512 MB */ #endif
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