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Commit e3e1d158 authored by Becky Bruce's avatar Becky Bruce Committed by Benjamin Herrenschmidt
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powerpc: Name xpn & x fields in HW Hash PTE format 



Previously, the 36-bit code was using these bits, but they had
never been named in the pte format definition.  This patch just
gives those fields their proper names and adds a comment that
they are only present on some processors.

There is no functional code change.

Signed-off-by: default avatarBecky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 948c28fe

arch/powerpc/include/asm/mmu-hash32.h

+7 −3
Original line number Diff line number Diff line
@@ -55,21 +55,25 @@ struct ppc_bat { 


#ifndef __ASSEMBLY__



/* Hardware Page Table Entry */

/*

 * Hardware Page Table Entry

 * Note that the xpn and x bitfields are used only by processors that

 * support extended addressing; otherwise, those bits are reserved.

 */

struct hash_pte {

	unsigned long v:1;	/* Entry is valid */

	unsigned long vsid:24;	/* Virtual segment identifier */

	unsigned long h:1;	/* Hash algorithm indicator */

	unsigned long api:6;	/* Abbreviated page index */

	unsigned long rpn:20;	/* Real (physical) page number */

	unsigned long    :3;	/* Unused */

	unsigned long xpn:3;	/* Real page number bits 0-2, optional */

	unsigned long r:1;	/* Referenced */

	unsigned long c:1;	/* Changed */

	unsigned long w:1;	/* Write-thru cache mode */

	unsigned long i:1;	/* Cache inhibited */

	unsigned long m:1;	/* Memory coherence */

	unsigned long g:1;	/* Guarded */

	unsigned long  :1;	/* Unused */

	unsigned long x:1;	/* Real page number bit 3, optional */

	unsigned long pp:2;	/* Page protection */

};