pacache.s

linux-2.6.15.6

/*
 *  PARISC TLB and cache flushing support
 *  Copyright (C) 2000-2001 Hewlett-Packard (John Marvin)
 *  Copyright (C) 2001 Matthew Wilcox (willy at parisc-linux.org)
 *  Copyright (C) 2002 Richard Hirst (rhirst with parisc-linux.org)
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * NOTE: fdc,fic, and pdc instructions that use base register modification
 *       should only use index and base registers that are not shadowed,
 *       so that the fast path emulation in the non access miss handler
 *       can be used.
 */

#ifdef CONFIG_64BIT
#define ADDIB	addib,*
#define CMPB	cmpb,*
#define ANDCM	andcm,*

	.level	2.0w
#else
#define ADDIB	addib,
#define CMPB	cmpb,
#define ANDCM	andcm

	.level	2.0
#endif

#include <linux/config.h>

#include <asm/psw.h>
#include <asm/assembly.h>
#include <asm/pgtable.h>
#include <asm/cache.h>

	.text
	.align	128

	.export flush_tlb_all_local,code

flush_tlb_all_local:
	.proc
	.callinfo NO_CALLS
	.entry

	/*
	 * The pitlbe and pdtlbe instructions should only be used to
	 * flush the entire tlb. Also, there needs to be no intervening
	 * tlb operations, e.g. tlb misses, so the operation needs
	 * to happen in real mode with all interruptions disabled.
	 */

	/* pcxt_ssm_bug	- relied upon translation! PA 2.0 Arch. F-4 and F-5 */
	rsm	PSW_SM_I, %r19		/* save I-bit state */
	load32		PA(1f), %r1
	nop
	nop
	nop
	nop
	nop

	rsm		PSW_SM_Q, %r0		/* prep to load iia queue */
	mtctl		%r0, %cr17		/* Clear IIASQ tail */
	mtctl		%r0, %cr17		/* Clear IIASQ head */
	mtctl		%r1, %cr18		/* IIAOQ head */
	ldo		4(%r1), %r1
	mtctl		%r1, %cr18		/* IIAOQ tail */
	load32		REAL_MODE_PSW, %r1
	mtctl           %r1, %ipsw
	rfi
	nop

1:      ldil		L%PA(cache_info), %r1
	ldo		R%PA(cache_info)(%r1), %r1

	/* Flush Instruction Tlb */

	LDREG		ITLB_SID_BASE(%r1), %r20
	LDREG		ITLB_SID_STRIDE(%r1), %r21
	LDREG		ITLB_SID_COUNT(%r1), %r22
	LDREG		ITLB_OFF_BASE(%r1), %arg0
	LDREG		ITLB_OFF_STRIDE(%r1), %arg1
	LDREG		ITLB_OFF_COUNT(%r1), %arg2
	LDREG		ITLB_LOOP(%r1), %arg3

	ADDIB=		-1, %arg3, fitoneloop	/* Preadjust and test */
	movb,<,n	%arg3, %r31, fitdone	/* If loop < 0, skip */
	copy		%arg0, %r28		/* Init base addr */

fitmanyloop:					/* Loop if LOOP >= 2 */
	mtsp		%r20, %sr1
	add		%r21, %r20, %r20	/* increment space */
	copy		%arg2, %r29		/* Init middle loop count */

fitmanymiddle:					/* Loop if LOOP >= 2 */
	ADDIB>		-1, %r31, fitmanymiddle	/* Adjusted inner loop decr */
	pitlbe		0(%sr1, %r28)
	pitlbe,m	%arg1(%sr1, %r28)	/* Last pitlbe and addr adjust */
	ADDIB>		-1, %r29, fitmanymiddle	/* Middle loop decr */
	copy		%arg3, %r31		/* Re-init inner loop count */

	movb,tr		%arg0, %r28, fitmanyloop /* Re-init base addr */
	ADDIB<=,n	-1, %r22, fitdone	/* Outer loop count decr */

fitoneloop:					/* Loop if LOOP = 1 */
	mtsp		%r20, %sr1
	copy		%arg0, %r28		/* init base addr */
	copy		%arg2, %r29		/* init middle loop count */

fitonemiddle:					/* Loop if LOOP = 1 */
	ADDIB>		-1, %r29, fitonemiddle	/* Middle loop count decr */
	pitlbe,m	%arg1(%sr1, %r28)	/* pitlbe for one loop */

	ADDIB>		-1, %r22, fitoneloop	/* Outer loop count decr */
	add		%r21, %r20, %r20		/* increment space */

fitdone:

	/* Flush Data Tlb */

	LDREG		DTLB_SID_BASE(%r1), %r20
	LDREG		DTLB_SID_STRIDE(%r1), %r21
	LDREG		DTLB_SID_COUNT(%r1), %r22
	LDREG		DTLB_OFF_BASE(%r1), %arg0
	LDREG		DTLB_OFF_STRIDE(%r1), %arg1
	LDREG		DTLB_OFF_COUNT(%r1), %arg2
	LDREG		DTLB_LOOP(%r1), %arg3

	ADDIB=		-1, %arg3, fdtoneloop	/* Preadjust and test */
	movb,<,n	%arg3, %r31, fdtdone	/* If loop < 0, skip */
	copy		%arg0, %r28		/* Init base addr */

fdtmanyloop:					/* Loop if LOOP >= 2 */
	mtsp		%r20, %sr1
	add		%r21, %r20, %r20	/* increment space */
	copy		%arg2, %r29		/* Init middle loop count */

fdtmanymiddle:					/* Loop if LOOP >= 2 */
	ADDIB>		-1, %r31, fdtmanymiddle	/* Adjusted inner loop decr */
	pdtlbe		0(%sr1, %r28)
	pdtlbe,m	%arg1(%sr1, %r28)	/* Last pdtlbe and addr adjust */
	ADDIB>		-1, %r29, fdtmanymiddle	/* Middle loop decr */
	copy		%arg3, %r31		/* Re-init inner loop count */

	movb,tr		%arg0, %r28, fdtmanyloop /* Re-init base addr */
	ADDIB<=,n	-1, %r22,fdtdone	/* Outer loop count decr */

fdtoneloop:					/* Loop if LOOP = 1 */
	mtsp		%r20, %sr1
	copy		%arg0, %r28		/* init base addr */
	copy		%arg2, %r29		/* init middle loop count */

fdtonemiddle:					/* Loop if LOOP = 1 */
	ADDIB>		-1, %r29, fdtonemiddle	/* Middle loop count decr */
	pdtlbe,m	%arg1(%sr1, %r28)	/* pdtlbe for one loop */

	ADDIB>		-1, %r22, fdtoneloop	/* Outer loop count decr */
	add		%r21, %r20, %r20	/* increment space */


fdtdone:
	/*
	 * Switch back to virtual mode
	 */
	/* pcxt_ssm_bug */
	rsm		PSW_SM_I, %r0
	load32		2f, %r1
	nop
	nop
	nop
	nop
	nop

	rsm		PSW_SM_Q, %r0		/* prep to load iia queue */
	mtctl		%r0, %cr17		/* Clear IIASQ tail */
	mtctl		%r0, %cr17		/* Clear IIASQ head */
	mtctl		%r1, %cr18		/* IIAOQ head */
	ldo		4(%r1), %r1
	mtctl		%r1, %cr18		/* IIAOQ tail */
	load32		KERNEL_PSW, %r1
	or		%r1, %r19, %r1	/* I-bit to state on entry */
	mtctl		%r1, %ipsw	/* restore I-bit (entire PSW) */
	rfi
	nop

2:      bv		%r0(%r2)
	nop

	.exit
	.procend

	.export flush_instruction_cache_local,code
	.import cache_info,data

flush_instruction_cache_local:
	.proc
	.callinfo NO_CALLS
	.entry

	mtsp		%r0, %sr1
	ldil		L%cache_info, %r1
	ldo		R%cache_info(%r1), %r1

	/* Flush Instruction Cache */

	LDREG		ICACHE_BASE(%r1), %arg0
	LDREG		ICACHE_STRIDE(%r1), %arg1
	LDREG		ICACHE_COUNT(%r1), %arg2
	LDREG		ICACHE_LOOP(%r1), %arg3
	rsm             PSW_SM_I, %r22		/* No mmgt ops during loop*/
	ADDIB=		-1, %arg3, fioneloop	/* Preadjust and test */
	movb,<,n	%arg3, %r31, fisync	/* If loop < 0, do sync */

fimanyloop:					/* Loop if LOOP >= 2 */
	ADDIB>		-1, %r31, fimanyloop	/* Adjusted inner loop decr */
	fice            %r0(%sr1, %arg0)
	fice,m		%arg1(%sr1, %arg0)	/* Last fice and addr adjust */
	movb,tr		%arg3, %r31, fimanyloop	/* Re-init inner loop count */
	ADDIB<=,n	-1, %arg2, fisync	/* Outer loop decr */

fioneloop:					/* Loop if LOOP = 1 */
	ADDIB>		-1, %arg2, fioneloop	/* Outer loop count decr */
	fice,m		%arg1(%sr1, %arg0)	/* Fice for one loop */

fisync:
	sync
	mtsm		%r22			/* restore I-bit */
	bv		%r0(%r2)
	nop
	.exit

	.procend

	.export flush_data_cache_local, code
	.import cache_info, data

flush_data_cache_local:
	.proc
	.callinfo NO_CALLS
	.entry

	mtsp		%r0, %sr1
	ldil		L%cache_info, %r1
	ldo		R%cache_info(%r1), %r1

	/* Flush Data Cache */

	LDREG		DCACHE_BASE(%r1), %arg0
	LDREG		DCACHE_STRIDE(%r1), %arg1
	LDREG		DCACHE_COUNT(%r1), %arg2
	LDREG		DCACHE_LOOP(%r1), %arg3
	rsm		PSW_SM_I, %r22
	ADDIB=		-1, %arg3, fdoneloop	/* Preadjust and test */
	movb,<,n	%arg3, %r31, fdsync	/* If loop < 0, do sync */

fdmanyloop:					/* Loop if LOOP >= 2 */
	ADDIB>		-1, %r31, fdmanyloop	/* Adjusted inner loop decr */
	fdce		%r0(%sr1, %arg0)
	fdce,m		%arg1(%sr1, %arg0)	/* Last fdce and addr adjust */
	movb,tr		%arg3, %r31, fdmanyloop	/* Re-init inner loop count */
	ADDIB<=,n	-1, %arg2, fdsync	/* Outer loop decr */

fdoneloop:					/* Loop if LOOP = 1 */
	ADDIB>		-1, %arg2, fdoneloop	/* Outer loop count decr */
	fdce,m		%arg1(%sr1, %arg0)	/* Fdce for one loop */

fdsync:
	syncdma
	sync
	mtsm		%r22			/* restore I-bit */
	bv		%r0(%r2)
	nop
	.exit

	.procend

	.export copy_user_page_asm,code
	.align	16

copy_user_page_asm:
	.proc
	.callinfo NO_CALLS
	.entry

#ifdef CONFIG_64BIT
	/* PA8x00 CPUs can consume 2 loads or 1 store per cycle.
	 * Unroll the loop by hand and arrange insn appropriately.
	 * GCC probably can do this just as well.
	 */

	ldd		0(%r25), %r19
	ldi		32, %r1                 /* PAGE_SIZE/128 == 32 */
	ldw		64(%r25), %r0		/* prefetch 1 cacheline ahead */
	ldw		128(%r25), %r0		/* prefetch 2 */

1:	ldd		8(%r25), %r20
	ldw		192(%r25), %r0		/* prefetch 3 */
	ldw		256(%r25), %r0		/* prefetch 4 */

	ldd		16(%r25), %r21
	ldd		24(%r25), %r22
	std		%r19, 0(%r26)
	std		%r20, 8(%r26)

	ldd		32(%r25), %r19
	ldd		40(%r25), %r20
	std		%r21, 16(%r26)
	std		%r22, 24(%r26)

	ldd		48(%r25), %r21
	ldd		56(%r25), %r22
	std		%r19, 32(%r26)
	std		%r20, 40(%r26)

	ldd		64(%r25), %r19
	ldd		72(%r25), %r20
	std		%r21, 48(%r26)
	std		%r22, 56(%r26)

	ldd		80(%r25), %r21
	ldd		88(%r25), %r22
	std		%r19, 64(%r26)
	std		%r20, 72(%r26)

	ldd		 96(%r25), %r19
	ldd		104(%r25), %r20
	std		%r21, 80(%r26)
	std		%r22, 88(%r26)

	ldd		112(%r25), %r21
	ldd		120(%r25), %r22
	std		%r19, 96(%r26)
	std		%r20, 104(%r26)

	ldo		128(%r25), %r25
	std		%r21, 112(%r26)
	std		%r22, 120(%r26)
	ldo		128(%r26), %r26

	/* conditional branches nullify on forward taken branch, and on
	 * non-taken backward branch. Note that .+4 is a backwards branch.
	 * The ldd should only get executed if the branch is taken.
	 */
	ADDIB>,n	-1, %r1, 1b		/* bundle 10 */
	ldd		0(%r25), %r19		/* start next loads */

#else

	/*
	 * This loop is optimized for PCXL/PCXL2 ldw/ldw and stw/stw
	 * bundles (very restricted rules for bundling).
	 * Note that until (if) we start saving
	 * the full 64 bit register values on interrupt, we can't
	 * use ldd/std on a 32 bit kernel.
	 */
	ldw		0(%r25), %r19
	ldi		64, %r1		/* PAGE_SIZE/64 == 64 */

1:
	ldw		4(%r25), %r20
	ldw		8(%r25), %r21
	ldw		12(%r25), %r22
	stw		%r19, 0(%r26)
	stw		%r20, 4(%r26)
	stw		%r21, 8(%r26)
	stw		%r22, 12(%r26)
	ldw		16(%r25), %r19
	ldw		20(%r25), %r20
	ldw		24(%r25), %r21
	ldw		28(%r25), %r22
	stw		%r19, 16(%r26)
	stw		%r20, 20(%r26)
	stw		%r21, 24(%r26)
	stw		%r22, 28(%r26)
	ldw		32(%r25), %r19
	ldw		36(%r25), %r20
	ldw		40(%r25), %r21
	ldw		44(%r25), %r22
	stw		%r19, 32(%r26)
	stw		%r20, 36(%r26)
	stw		%r21, 40(%r26)
	stw		%r22, 44(%r26)
	ldw		48(%r25), %r19
	ldw		52(%r25), %r20
	ldw		56(%r25), %r21
	ldw		60(%r25), %r22
	stw		%r19, 48(%r26)
	stw		%r20, 52(%r26)
	ldo		64(%r25), %r25
	stw		%r21, 56(%r26)
	stw		%r22, 60(%r26)
	ldo		64(%r26), %r26
	ADDIB>,n	-1, %r1, 1b
	ldw		0(%r25), %r19
#endif
	bv		%r0(%r2)
	nop
	.exit

	.procend

/*
 * NOTE: Code in clear_user_page has a hard coded dependency on the
 *       maximum alias boundary being 4 Mb. We've been assured by the
 *       parisc chip designers that there will not ever be a parisc
 *       chip with a larger alias boundary (Never say never :-) ).
 *
 *       Subtle: the dtlb miss handlers support the temp alias region by
 *       "knowing" that if a dtlb miss happens within the temp alias
 *       region it must have occurred while in clear_user_page. Since
 *       this routine makes use of processor local translations, we
 *       don't want to insert them into the kernel page table. Instead,
 *       we load up some general registers (they need to be registers
 *       which aren't shadowed) with the physical page numbers (preshifted
 *       for tlb insertion) needed to insert the translations. When we
 *       miss on the translation, the dtlb miss handler inserts the
 *       translation into the tlb using these values:
 *
 *          %r26 physical page (shifted for tlb insert) of "to" translation
 *          %r23 physical page (shifted for tlb insert) of "from" translation
 */

#if 0

	/*
	 * We can't do this since copy_user_page is used to bring in
	 * file data that might have instructions. Since the data would
	 * then need to be flushed out so the i-fetch can see it, it
	 * makes more sense to just copy through the kernel translation
	 * and flush it.
	 *
	 * I'm still keeping this around because it may be possible to
	 * use it if more information is passed into copy_user_page().
	 * Have to do some measurements to see if it is worthwhile to
	 * lobby for such a change.
	 */

	.export copy_user_page_asm,code

copy_user_page_asm:
	.proc
	.callinfo NO_CALLS
	.entry

	ldil		L%(__PAGE_OFFSET), %r1
	sub		%r26, %r1, %r26
	sub		%r25, %r1, %r23		/* move physical addr into non shadowed reg */

	ldil		L%(TMPALIAS_MAP_START), %r28
#ifdef CONFIG_64BIT
	extrd,u		%r26,56,32, %r26		/* convert phys addr to tlb insert format */
	extrd,u		%r23,56,32, %r23		/* convert phys addr to tlb insert format */
	depd		%r24,63,22, %r28		/* Form aliased virtual address 'to' */
	depdi		0, 63,12, %r28		/* Clear any offset bits */
	copy		%r28, %r29
	depdi		1, 41,1, %r29		/* Form aliased virtual address 'from' */
#else
	extrw,u		%r26, 24,25, %r26	/* convert phys addr to tlb insert format */
	extrw,u		%r23, 24,25, %r23	/* convert phys addr to tlb insert format */
	depw		%r24, 31,22, %r28	/* Form aliased virtual address 'to' */
	depwi		0, 31,12, %r28		/* Clear any offset bits */
	copy		%r28, %r29
	depwi		1, 9,1, %r29		/* Form aliased virtual address 'from' */
#endif

	/* Purge any old translations */

	pdtlb		0(%r28)
	pdtlb		0(%r29)

	ldi		64, %r1

	/*
	 * This loop is optimized for PCXL/PCXL2 ldw/ldw and stw/stw
	 * bundles (very restricted rules for bundling). It probably
	 * does OK on PCXU and better, but we could do better with
	 * ldd/std instructions. Note that until (if) we start saving
	 * the full 64 bit register values on interrupt, we can't
	 * use ldd/std on a 32 bit kernel.
	 */


1:
	ldw		0(%r29), %r19
	ldw		4(%r29), %r20
	ldw		8(%r29), %r21
	ldw		12(%r29), %r22
	stw		%r19, 0(%r28)
	stw		%r20, 4(%r28)
	stw		%r21, 8(%r28)
	stw		%r22, 12(%r28)
	ldw		16(%r29), %r19
	ldw		20(%r29), %r20
	ldw		24(%r29), %r21
	ldw		28(%r29), %r22
	stw		%r19, 16(%r28)
	stw		%r20, 20(%r28)
	stw		%r21, 24(%r28)
	stw		%r22, 28(%r28)
	ldw		32(%r29), %r19
	ldw		36(%r29), %r20
	ldw		40(%r29), %r21
	ldw		44(%r29), %r22
	stw		%r19, 32(%r28)
	stw		%r20, 36(%r28)
	stw		%r21, 40(%r28)
	stw		%r22, 44(%r28)
	ldw		48(%r29), %r19
	ldw		52(%r29), %r20
	ldw		56(%r29), %r21
	ldw		60(%r29), %r22
	stw		%r19, 48(%r28)
	stw		%r20, 52(%r28)
	stw		%r21, 56(%r28)
	stw		%r22, 60(%r28)
	ldo		64(%r28), %r28
	ADDIB>		-1, %r1,1b
	ldo		64(%r29), %r29

	bv		%r0(%r2)
	nop
	.exit

	.procend
#endif

	.export __clear_user_page_asm,code

__clear_user_page_asm:
	.proc
	.callinfo NO_CALLS
	.entry

	tophys_r1	%r26