2 * PARISC TLB and cache flushing support
3 * Copyright (C) 2000-2001 Hewlett-Packard (John Marvin)
4 * Copyright (C) 2001 Matthew Wilcox (willy at parisc-linux.org)
5 * Copyright (C) 2002 Richard Hirst (rhirst with parisc-linux.org)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * NOTE: fdc,fic, and pdc instructions that use base register modification
24 * should only use index and base registers that are not shadowed,
25 * so that the fast path emulation in the non access miss handler
45 #include <asm/assembly.h>
46 #include <asm/pgtable.h>
47 #include <asm/cache.h>
52 .export flush_tlb_all_local,code
60 * The pitlbe and pdtlbe instructions should only be used to
61 * flush the entire tlb. Also, there needs to be no intervening
62 * tlb operations, e.g. tlb misses, so the operation needs
63 * to happen in real mode with all interruptions disabled.
66 /* pcxt_ssm_bug - relied upon translation! PA 2.0 Arch. F-4 and F-5 */
67 rsm PSW_SM_I, %r19 /* save I-bit state */
75 rsm PSW_SM_Q, %r0 /* prep to load iia queue */
76 mtctl %r0, %cr17 /* Clear IIASQ tail */
77 mtctl %r0, %cr17 /* Clear IIASQ head */
78 mtctl %r1, %cr18 /* IIAOQ head */
80 mtctl %r1, %cr18 /* IIAOQ tail */
81 load32 REAL_MODE_PSW, %r1
86 1: load32 PA(cache_info), %r1
88 /* Flush Instruction Tlb */
90 LDREG ITLB_SID_BASE(%r1), %r20
91 LDREG ITLB_SID_STRIDE(%r1), %r21
92 LDREG ITLB_SID_COUNT(%r1), %r22
93 LDREG ITLB_OFF_BASE(%r1), %arg0
94 LDREG ITLB_OFF_STRIDE(%r1), %arg1
95 LDREG ITLB_OFF_COUNT(%r1), %arg2
96 LDREG ITLB_LOOP(%r1), %arg3
98 ADDIB= -1, %arg3, fitoneloop /* Preadjust and test */
99 movb,<,n %arg3, %r31, fitdone /* If loop < 0, skip */
100 copy %arg0, %r28 /* Init base addr */
102 fitmanyloop: /* Loop if LOOP >= 2 */
104 add %r21, %r20, %r20 /* increment space */
105 copy %arg2, %r29 /* Init middle loop count */
107 fitmanymiddle: /* Loop if LOOP >= 2 */
108 ADDIB> -1, %r31, fitmanymiddle /* Adjusted inner loop decr */
110 pitlbe,m %arg1(%sr1, %r28) /* Last pitlbe and addr adjust */
111 ADDIB> -1, %r29, fitmanymiddle /* Middle loop decr */
112 copy %arg3, %r31 /* Re-init inner loop count */
114 movb,tr %arg0, %r28, fitmanyloop /* Re-init base addr */
115 ADDIB<=,n -1, %r22, fitdone /* Outer loop count decr */
117 fitoneloop: /* Loop if LOOP = 1 */
119 copy %arg0, %r28 /* init base addr */
120 copy %arg2, %r29 /* init middle loop count */
122 fitonemiddle: /* Loop if LOOP = 1 */
123 ADDIB> -1, %r29, fitonemiddle /* Middle loop count decr */
124 pitlbe,m %arg1(%sr1, %r28) /* pitlbe for one loop */
126 ADDIB> -1, %r22, fitoneloop /* Outer loop count decr */
127 add %r21, %r20, %r20 /* increment space */
133 LDREG DTLB_SID_BASE(%r1), %r20
134 LDREG DTLB_SID_STRIDE(%r1), %r21
135 LDREG DTLB_SID_COUNT(%r1), %r22
136 LDREG DTLB_OFF_BASE(%r1), %arg0
137 LDREG DTLB_OFF_STRIDE(%r1), %arg1
138 LDREG DTLB_OFF_COUNT(%r1), %arg2
139 LDREG DTLB_LOOP(%r1), %arg3
141 ADDIB= -1, %arg3, fdtoneloop /* Preadjust and test */
142 movb,<,n %arg3, %r31, fdtdone /* If loop < 0, skip */
143 copy %arg0, %r28 /* Init base addr */
145 fdtmanyloop: /* Loop if LOOP >= 2 */
147 add %r21, %r20, %r20 /* increment space */
148 copy %arg2, %r29 /* Init middle loop count */
150 fdtmanymiddle: /* Loop if LOOP >= 2 */
151 ADDIB> -1, %r31, fdtmanymiddle /* Adjusted inner loop decr */
153 pdtlbe,m %arg1(%sr1, %r28) /* Last pdtlbe and addr adjust */
154 ADDIB> -1, %r29, fdtmanymiddle /* Middle loop decr */
155 copy %arg3, %r31 /* Re-init inner loop count */
157 movb,tr %arg0, %r28, fdtmanyloop /* Re-init base addr */
158 ADDIB<=,n -1, %r22,fdtdone /* Outer loop count decr */
160 fdtoneloop: /* Loop if LOOP = 1 */
162 copy %arg0, %r28 /* init base addr */
163 copy %arg2, %r29 /* init middle loop count */
165 fdtonemiddle: /* Loop if LOOP = 1 */
166 ADDIB> -1, %r29, fdtonemiddle /* Middle loop count decr */
167 pdtlbe,m %arg1(%sr1, %r28) /* pdtlbe for one loop */
169 ADDIB> -1, %r22, fdtoneloop /* Outer loop count decr */
170 add %r21, %r20, %r20 /* increment space */
175 * Switch back to virtual mode
186 rsm PSW_SM_Q, %r0 /* prep to load iia queue */
187 mtctl %r0, %cr17 /* Clear IIASQ tail */
188 mtctl %r0, %cr17 /* Clear IIASQ head */
189 mtctl %r1, %cr18 /* IIAOQ head */
191 mtctl %r1, %cr18 /* IIAOQ tail */
192 load32 KERNEL_PSW, %r1
193 or %r1, %r19, %r1 /* I-bit to state on entry */
194 mtctl %r1, %ipsw /* restore I-bit (entire PSW) */
204 .export flush_instruction_cache_local,code
205 .import cache_info,data
207 flush_instruction_cache_local:
213 load32 cache_info, %r1
215 /* Flush Instruction Cache */
217 LDREG ICACHE_BASE(%r1), %arg0
218 LDREG ICACHE_STRIDE(%r1), %arg1
219 LDREG ICACHE_COUNT(%r1), %arg2
220 LDREG ICACHE_LOOP(%r1), %arg3
221 rsm PSW_SM_I, %r22 /* No mmgt ops during loop*/
222 ADDIB= -1, %arg3, fioneloop /* Preadjust and test */
223 movb,<,n %arg3, %r31, fisync /* If loop < 0, do sync */
225 fimanyloop: /* Loop if LOOP >= 2 */
226 ADDIB> -1, %r31, fimanyloop /* Adjusted inner loop decr */
227 fice %r0(%sr1, %arg0)
228 fice,m %arg1(%sr1, %arg0) /* Last fice and addr adjust */
229 movb,tr %arg3, %r31, fimanyloop /* Re-init inner loop count */
230 ADDIB<=,n -1, %arg2, fisync /* Outer loop decr */
232 fioneloop: /* Loop if LOOP = 1 */
233 ADDIB> -1, %arg2, fioneloop /* Outer loop count decr */
234 fice,m %arg1(%sr1, %arg0) /* Fice for one loop */
238 mtsm %r22 /* restore I-bit */
245 .export flush_data_cache_local, code
246 .import cache_info, data
248 flush_data_cache_local:
254 load32 cache_info, %r1
256 /* Flush Data Cache */
258 LDREG DCACHE_BASE(%r1), %arg0
259 LDREG DCACHE_STRIDE(%r1), %arg1
260 LDREG DCACHE_COUNT(%r1), %arg2
261 LDREG DCACHE_LOOP(%r1), %arg3
263 ADDIB= -1, %arg3, fdoneloop /* Preadjust and test */
264 movb,<,n %arg3, %r31, fdsync /* If loop < 0, do sync */
266 fdmanyloop: /* Loop if LOOP >= 2 */
267 ADDIB> -1, %r31, fdmanyloop /* Adjusted inner loop decr */
268 fdce %r0(%sr1, %arg0)
269 fdce,m %arg1(%sr1, %arg0) /* Last fdce and addr adjust */
270 movb,tr %arg3, %r31, fdmanyloop /* Re-init inner loop count */
271 ADDIB<=,n -1, %arg2, fdsync /* Outer loop decr */
273 fdoneloop: /* Loop if LOOP = 1 */
274 ADDIB> -1, %arg2, fdoneloop /* Outer loop count decr */
275 fdce,m %arg1(%sr1, %arg0) /* Fdce for one loop */
280 mtsm %r22 /* restore I-bit */
287 .export copy_user_page_asm,code
296 /* PA8x00 CPUs can consume 2 loads or 1 store per cycle.
297 * Unroll the loop by hand and arrange insn appropriately.
298 * GCC probably can do this just as well.
302 ldi ASM_PAGE_SIZE_DIV128, %r1
304 ldw 64(%r25), %r0 /* prefetch 1 cacheline ahead */
305 ldw 128(%r25), %r0 /* prefetch 2 */
308 ldw 192(%r25), %r0 /* prefetch 3 */
309 ldw 256(%r25), %r0 /* prefetch 4 */
351 /* conditional branches nullify on forward taken branch, and on
352 * non-taken backward branch. Note that .+4 is a backwards branch.
353 * The ldd should only get executed if the branch is taken.
355 ADDIB>,n -1, %r1, 1b /* bundle 10 */
356 ldd 0(%r25), %r19 /* start next loads */
361 * This loop is optimized for PCXL/PCXL2 ldw/ldw and stw/stw
362 * bundles (very restricted rules for bundling).
363 * Note that until (if) we start saving
364 * the full 64 bit register values on interrupt, we can't
365 * use ldd/std on a 32 bit kernel.
368 ldi ASM_PAGE_SIZE_DIV64, %r1
414 * NOTE: Code in clear_user_page has a hard coded dependency on the
415 * maximum alias boundary being 4 Mb. We've been assured by the
416 * parisc chip designers that there will not ever be a parisc
417 * chip with a larger alias boundary (Never say never :-) ).
419 * Subtle: the dtlb miss handlers support the temp alias region by
420 * "knowing" that if a dtlb miss happens within the temp alias
421 * region it must have occurred while in clear_user_page. Since
422 * this routine makes use of processor local translations, we
423 * don't want to insert them into the kernel page table. Instead,
424 * we load up some general registers (they need to be registers
425 * which aren't shadowed) with the physical page numbers (preshifted
426 * for tlb insertion) needed to insert the translations. When we
427 * miss on the translation, the dtlb miss handler inserts the
428 * translation into the tlb using these values:
430 * %r26 physical page (shifted for tlb insert) of "to" translation
431 * %r23 physical page (shifted for tlb insert) of "from" translation
437 * We can't do this since copy_user_page is used to bring in
438 * file data that might have instructions. Since the data would
439 * then need to be flushed out so the i-fetch can see it, it
440 * makes more sense to just copy through the kernel translation
443 * I'm still keeping this around because it may be possible to
444 * use it if more information is passed into copy_user_page().
445 * Have to do some measurements to see if it is worthwhile to
446 * lobby for such a change.
449 .export copy_user_page_asm,code
456 ldil L%(__PAGE_OFFSET), %r1
458 sub %r25, %r1, %r23 /* move physical addr into non shadowed reg */
460 ldil L%(TMPALIAS_MAP_START), %r28
461 /* FIXME for different page sizes != 4k */
463 extrd,u %r26,56,32, %r26 /* convert phys addr to tlb insert format */
464 extrd,u %r23,56,32, %r23 /* convert phys addr to tlb insert format */
465 depd %r24,63,22, %r28 /* Form aliased virtual address 'to' */
466 depdi 0, 63,12, %r28 /* Clear any offset bits */
468 depdi 1, 41,1, %r29 /* Form aliased virtual address 'from' */
470 extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
471 extrw,u %r23, 24,25, %r23 /* convert phys addr to tlb insert format */
472 depw %r24, 31,22, %r28 /* Form aliased virtual address 'to' */
473 depwi 0, 31,12, %r28 /* Clear any offset bits */
475 depwi 1, 9,1, %r29 /* Form aliased virtual address 'from' */
478 /* Purge any old translations */
486 * This loop is optimized for PCXL/PCXL2 ldw/ldw and stw/stw
487 * bundles (very restricted rules for bundling). It probably
488 * does OK on PCXU and better, but we could do better with
489 * ldd/std instructions. Note that until (if) we start saving
490 * the full 64 bit register values on interrupt, we can't
491 * use ldd/std on a 32 bit kernel.
539 .export __clear_user_page_asm,code
541 __clear_user_page_asm:
548 ldil L%(TMPALIAS_MAP_START), %r28
550 #if (TMPALIAS_MAP_START >= 0x80000000)
551 depdi 0, 31,32, %r28 /* clear any sign extension */
552 /* FIXME: page size dependend */
554 extrd,u %r26, 56,32, %r26 /* convert phys addr to tlb insert format */
555 depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
556 depdi 0, 63,12, %r28 /* Clear any offset bits */
558 extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
559 depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
560 depwi 0, 31,12, %r28 /* Clear any offset bits */
563 /* Purge any old translation */
568 ldi ASM_PAGE_SIZE_DIV128, %r1
570 /* PREFETCH (Write) has not (yet) been proven to help here */
571 /* #define PREFETCHW_OP ldd 256(%0), %r0 */
592 #else /* ! CONFIG_64BIT */
593 ldi ASM_PAGE_SIZE_DIV64, %r1
614 #endif /* CONFIG_64BIT */
622 .export flush_kernel_dcache_page_asm
624 flush_kernel_dcache_page_asm:
629 ldil L%dcache_stride, %r1
630 ldw R%dcache_stride(%r1), %r23
633 depdi,z 1, 63-PAGE_SHIFT,1, %r25
635 depwi,z 1, 31-PAGE_SHIFT,1, %r25
666 .export flush_user_dcache_page
668 flush_user_dcache_page:
673 ldil L%dcache_stride, %r1
674 ldw R%dcache_stride(%r1), %r23
677 depdi,z 1,63-PAGE_SHIFT,1, %r25
679 depwi,z 1,31-PAGE_SHIFT,1, %r25
685 1: fdc,m %r23(%sr3, %r26)
686 fdc,m %r23(%sr3, %r26)
687 fdc,m %r23(%sr3, %r26)
688 fdc,m %r23(%sr3, %r26)
689 fdc,m %r23(%sr3, %r26)
690 fdc,m %r23(%sr3, %r26)
691 fdc,m %r23(%sr3, %r26)
692 fdc,m %r23(%sr3, %r26)
693 fdc,m %r23(%sr3, %r26)
694 fdc,m %r23(%sr3, %r26)
695 fdc,m %r23(%sr3, %r26)
696 fdc,m %r23(%sr3, %r26)
697 fdc,m %r23(%sr3, %r26)
698 fdc,m %r23(%sr3, %r26)
699 fdc,m %r23(%sr3, %r26)
701 fdc,m %r23(%sr3, %r26)
710 .export flush_user_icache_page
712 flush_user_icache_page:
717 ldil L%dcache_stride, %r1
718 ldw R%dcache_stride(%r1), %r23
721 depdi,z 1, 63-PAGE_SHIFT,1, %r25
723 depwi,z 1, 31-PAGE_SHIFT,1, %r25
729 1: fic,m %r23(%sr3, %r26)
730 fic,m %r23(%sr3, %r26)
731 fic,m %r23(%sr3, %r26)
732 fic,m %r23(%sr3, %r26)
733 fic,m %r23(%sr3, %r26)
734 fic,m %r23(%sr3, %r26)
735 fic,m %r23(%sr3, %r26)
736 fic,m %r23(%sr3, %r26)
737 fic,m %r23(%sr3, %r26)
738 fic,m %r23(%sr3, %r26)
739 fic,m %r23(%sr3, %r26)
740 fic,m %r23(%sr3, %r26)
741 fic,m %r23(%sr3, %r26)
742 fic,m %r23(%sr3, %r26)
743 fic,m %r23(%sr3, %r26)
745 fic,m %r23(%sr3, %r26)
755 .export purge_kernel_dcache_page
757 purge_kernel_dcache_page:
762 ldil L%dcache_stride, %r1
763 ldw R%dcache_stride(%r1), %r23
766 depdi,z 1, 63-PAGE_SHIFT,1, %r25
768 depwi,z 1, 31-PAGE_SHIFT,1, %r25
788 CMPB<< %r26, %r25, 1b
799 /* Currently not used, but it still is a possible alternate
803 .export flush_alias_page
812 ldil L%(TMPALIAS_MAP_START), %r28
814 extrd,u %r26, 56,32, %r26 /* convert phys addr to tlb insert format */
815 depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
816 depdi 0, 63,12, %r28 /* Clear any offset bits */
818 extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
819 depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
820 depwi 0, 31,12, %r28 /* Clear any offset bits */
823 /* Purge any old translation */
827 ldil L%dcache_stride, %r1
828 ldw R%dcache_stride(%r1), %r23
831 depdi,z 1, 63-PAGE_SHIFT,1, %r29
833 depwi,z 1, 31-PAGE_SHIFT,1, %r29
853 CMPB<< %r28, %r29, 1b
864 .export flush_user_dcache_range_asm
866 flush_user_dcache_range_asm:
871 ldil L%dcache_stride, %r1
872 ldw R%dcache_stride(%r1), %r23
874 ANDCM %r26, %r21, %r26
876 1: CMPB<<,n %r26, %r25, 1b
877 fdc,m %r23(%sr3, %r26)
886 .export flush_kernel_dcache_range_asm
888 flush_kernel_dcache_range_asm:
893 ldil L%dcache_stride, %r1
894 ldw R%dcache_stride(%r1), %r23
896 ANDCM %r26, %r21, %r26
898 1: CMPB<<,n %r26, %r25,1b
909 .export flush_user_icache_range_asm
911 flush_user_icache_range_asm:
916 ldil L%icache_stride, %r1
917 ldw R%icache_stride(%r1), %r23
919 ANDCM %r26, %r21, %r26
921 1: CMPB<<,n %r26, %r25,1b
922 fic,m %r23(%sr3, %r26)
931 .export flush_kernel_icache_page
933 flush_kernel_icache_page:
938 ldil L%icache_stride, %r1
939 ldw R%icache_stride(%r1), %r23
942 depdi,z 1, 63-PAGE_SHIFT,1, %r25
944 depwi,z 1, 31-PAGE_SHIFT,1, %r25
950 1: fic,m %r23(%sr4, %r26)
951 fic,m %r23(%sr4, %r26)
952 fic,m %r23(%sr4, %r26)
953 fic,m %r23(%sr4, %r26)
954 fic,m %r23(%sr4, %r26)
955 fic,m %r23(%sr4, %r26)
956 fic,m %r23(%sr4, %r26)
957 fic,m %r23(%sr4, %r26)
958 fic,m %r23(%sr4, %r26)
959 fic,m %r23(%sr4, %r26)
960 fic,m %r23(%sr4, %r26)
961 fic,m %r23(%sr4, %r26)
962 fic,m %r23(%sr4, %r26)
963 fic,m %r23(%sr4, %r26)
964 fic,m %r23(%sr4, %r26)
965 CMPB<< %r26, %r25, 1b
966 fic,m %r23(%sr4, %r26)
975 .export flush_kernel_icache_range_asm
977 flush_kernel_icache_range_asm:
982 ldil L%icache_stride, %r1
983 ldw R%icache_stride(%r1), %r23
985 ANDCM %r26, %r21, %r26
987 1: CMPB<<,n %r26, %r25, 1b
988 fic,m %r23(%sr4, %r26)
996 /* align should cover use of rfi in disable_sr_hashing_asm and
1000 .export disable_sr_hashing_asm,code
1002 disable_sr_hashing_asm:
1008 * Switch to real mode
1019 rsm PSW_SM_Q, %r0 /* prep to load iia queue */
1020 mtctl %r0, %cr17 /* Clear IIASQ tail */
1021 mtctl %r0, %cr17 /* Clear IIASQ head */
1022 mtctl %r1, %cr18 /* IIAOQ head */
1024 mtctl %r1, %cr18 /* IIAOQ tail */
1025 load32 REAL_MODE_PSW, %r1
1030 1: cmpib,=,n SRHASH_PCXST, %r26,srdis_pcxs
1031 cmpib,=,n SRHASH_PCXL, %r26,srdis_pcxl
1032 cmpib,=,n SRHASH_PA20, %r26,srdis_pa20
1037 /* Disable Space Register Hashing for PCXS,PCXT,PCXT' */
1039 .word 0x141c1a00 /* mfdiag %dr0, %r28 */
1040 .word 0x141c1a00 /* must issue twice */
1041 depwi 0,18,1, %r28 /* Clear DHE (dcache hash enable) */
1042 depwi 0,20,1, %r28 /* Clear IHE (icache hash enable) */
1043 .word 0x141c1600 /* mtdiag %r28, %dr0 */
1044 .word 0x141c1600 /* must issue twice */
1049 /* Disable Space Register Hashing for PCXL */
1051 .word 0x141c0600 /* mfdiag %dr0, %r28 */
1052 depwi 0,28,2, %r28 /* Clear DHASH_EN & IHASH_EN */
1053 .word 0x141c0240 /* mtdiag %r28, %dr0 */
1058 /* Disable Space Register Hashing for PCXU,PCXU+,PCXW,PCXW+,PCXW2 */
1060 .word 0x144008bc /* mfdiag %dr2, %r28 */
1061 depdi 0, 54,1, %r28 /* clear DIAG_SPHASH_ENAB (bit 54) */
1062 .word 0x145c1840 /* mtdiag %r28, %dr2 */
1066 /* Switch back to virtual mode */
1067 rsm PSW_SM_I, %r0 /* prep to load iia queue */
1075 rsm PSW_SM_Q, %r0 /* prep to load iia queue */
1076 mtctl %r0, %cr17 /* Clear IIASQ tail */
1077 mtctl %r0, %cr17 /* Clear IIASQ head */
1078 mtctl %r1, %cr18 /* IIAOQ head */
1080 mtctl %r1, %cr18 /* IIAOQ tail */
1081 load32 KERNEL_PSW, %r1