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Commit 32c1ceea authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Drop two instructions from pte lookup code 



Remove two instruction from the hot path. The temporary move to %r9 is
unneccessary, and the zero-inialization of pte happens twice.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent a45a0116

arch/parisc/kernel/entry.S

+1 −3
Original line number Diff line number Diff line
@@ -427,8 +427,7 @@ 
	ldw,s		\index(\pmd),\pmd

	bb,>=,n		\pmd,_PxD_PRESENT_BIT,\fault

	dep		%r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */

	copy		\pmd,%r9

	SHLREG		%r9,PxD_VALUE_SHIFT,\pmd

	SHLREG		\pmd,PxD_VALUE_SHIFT,\pmd

	extru		\va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index

	dep		%r0,31,PAGE_SHIFT,\pmd  /* clear offset */

	shladd		\index,BITS_PER_PTE_ENTRY,\pmd,\pmd /* pmd is now pte */
@@ -447,7 +446,6 @@ 
	.macro		L3_ptep pgd,pte,index,va,fault

#if CONFIG_PGTABLE_LEVELS == 3 /* we might have a 2-Level scheme, e.g. with 16kb page size */

	extrd,u		\va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index

	copy		%r0,\pte

	extrd,u,*=	\va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0

	ldw,s		\index(\pgd),\pgd

	extrd,u,*=	\va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0