Commit afca2523 authored by Helge Deller's avatar Helge Deller Committed by Kyle McMartin
Browse files

parisc: allow to build with 16k default kernel page size 



Introduce new convert_for_tlb_insert20 macro and use it to replace assembler
statements with hardcoded constants.
This change allows the parisc64 kernel to boot with 16kb default kernel page size,
aka CONFIG_PARISC_PAGE_SIZE_16KB=y.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarKyle McMartin <kyle@mcmartin.ca>
parent 445c088f

arch/parisc/kernel/entry.S

+17 −8
Original line number Diff line number Diff line
@@ -505,6 +505,18 @@ 
	STREG		\pte,0(\ptep)

	.endm



	/* bitshift difference between a PFN (based on kernel's PAGE_SIZE)

	 * to a CPU TLB 4k PFN (4k => 12 bits to shift) */

	#define PAGE_ADD_SHIFT  (PAGE_SHIFT-12)



	/* Drop prot bits and convert to page addr for iitlbt and idtlbt */

	.macro		convert_for_tlb_insert20 pte

	extrd,u		\pte,(63-ASM_PFN_PTE_SHIFT)+(63-58)+PAGE_ADD_SHIFT,\

				64-PAGE_SHIFT-PAGE_ADD_SHIFT,\pte

	depdi		_PAGE_SIZE_ENCODING_DEFAULT,63,\

				(63-58)+PAGE_ADD_SHIFT,\pte

	.endm



	/* Convert the pte and prot to tlb insertion values.  How

	 * this happens is quite subtle, read below */

	.macro		make_insert_tlb	spc,pte,prot
@@ -544,8 +556,7 @@ 
	depi		1,12,1,\prot



	/* Drop prot bits and convert to page addr for iitlbt and idtlbt */

	extrd,u		\pte,(63-ASM_PFN_PTE_SHIFT)+(63-58),64-PAGE_SHIFT,\pte

	depdi		_PAGE_SIZE_ENCODING_DEFAULT,63,63-58,\pte

	convert_for_tlb_insert20 \pte

	.endm



	/* Identical macro to make_insert_tlb above, except it
@@ -1244,10 +1255,9 @@ nadtlb_check_flush_20w: 
	depdi,z         7,7,3,prot

	depdi           1,10,1,prot



	/* Get rid of prot bits and convert to page addr for idtlbt */

	/* Drop prot bits from pte and convert to page addr for idtlbt */

	convert_for_tlb_insert20 pte



	depdi		0,63,12,pte

	extrd,u         pte,56,52,pte

	idtlbt          pte,prot



	rfir
@@ -1403,10 +1413,9 @@ nadtlb_check_flush_20: 
	depdi,z         7,7,3,prot

	depdi           1,10,1,prot



	/* Get rid of prot bits and convert to page addr for idtlbt */

	/* Drop prot bits from pte and convert to page addr for idtlbt */

	convert_for_tlb_insert20 pte



	depdi		0,63,12,pte

	extrd,u         pte,56,32,pte

	idtlbt          pte,prot



	rfir

CRA Git | Maintained and supported by SUSTech CRA and CCSE