2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Synthesize TLB refill handlers at runtime.
8 * Copyright (C) 2004, 2005, 2006, 2008 Thiemo Seufer
9 * Copyright (C) 2005, 2007, 2008, 2009 Maciej W. Rozycki
10 * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
11 * Copyright (C) 2008, 2009 Cavium Networks, Inc.
13 * ... and the days got worse and worse and now you see
14 * I've gone completly out of my mind.
16 * They're coming to take me a away haha
17 * they're coming to take me a away hoho hihi haha
18 * to the funny farm where code is beautiful all the time ...
20 * (Condolences to Napoleon XIV)
23 #include <linux/bug.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/smp.h>
27 #include <linux/string.h>
28 #include <linux/init.h>
30 #include <asm/mmu_context.h>
34 static inline int r45k_bvahwbug(void)
36 /* XXX: We should probe for the presence of this bug, but we don't. */
40 static inline int r4k_250MHZhwbug(void)
42 /* XXX: We should probe for the presence of this bug, but we don't. */
46 static inline int __maybe_unused bcm1250_m3_war(void)
48 return BCM1250_M3_WAR;
51 static inline int __maybe_unused r10000_llsc_war(void)
53 return R10000_LLSC_WAR;
57 * Found by experiment: At least some revisions of the 4kc throw under
58 * some circumstances a machine check exception, triggered by invalid
59 * values in the index register. Delaying the tlbp instruction until
60 * after the next branch, plus adding an additional nop in front of
61 * tlbwi/tlbwr avoids the invalid index register values. Nobody knows
62 * why; it's not an issue caused by the core RTL.
65 static int __cpuinit m4kc_tlbp_war(void)
67 return (current_cpu_data.processor_id & 0xffff00) ==
68 (PRID_COMP_MIPS | PRID_IMP_4KC);
71 /* Handle labels (which must be positive integers). */
73 label_second_part = 1,
84 label_smp_pgtable_change,
85 label_r3000_write_probe_fail,
86 #ifdef CONFIG_HUGETLB_PAGE
87 label_tlb_huge_update,
91 UASM_L_LA(_second_part)
94 UASM_L_LA(_vmalloc_done)
95 UASM_L_LA(_tlbw_hazard)
97 UASM_L_LA(_tlbl_goaround1)
98 UASM_L_LA(_tlbl_goaround2)
99 UASM_L_LA(_nopage_tlbl)
100 UASM_L_LA(_nopage_tlbs)
101 UASM_L_LA(_nopage_tlbm)
102 UASM_L_LA(_smp_pgtable_change)
103 UASM_L_LA(_r3000_write_probe_fail)
104 #ifdef CONFIG_HUGETLB_PAGE
105 UASM_L_LA(_tlb_huge_update)
109 * For debug purposes.
111 static inline void dump_handler(const u32 *handler, int count)
115 pr_debug("\t.set push\n");
116 pr_debug("\t.set noreorder\n");
118 for (i = 0; i < count; i++)
119 pr_debug("\t%p\t.word 0x%08x\n", &handler[i], handler[i]);
121 pr_debug("\t.set pop\n");
124 /* The only general purpose registers allowed in TLB handlers. */
128 /* Some CP0 registers */
129 #define C0_INDEX 0, 0
130 #define C0_ENTRYLO0 2, 0
131 #define C0_TCBIND 2, 2
132 #define C0_ENTRYLO1 3, 0
133 #define C0_CONTEXT 4, 0
134 #define C0_PAGEMASK 5, 0
135 #define C0_BADVADDR 8, 0
136 #define C0_ENTRYHI 10, 0
138 #define C0_XCONTEXT 20, 0
141 # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_XCONTEXT)
143 # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_CONTEXT)
146 /* The worst case length of the handler is around 18 instructions for
147 * R3000-style TLBs and up to 63 instructions for R4000-style TLBs.
148 * Maximum space available is 32 instructions for R3000 and 64
149 * instructions for R4000.
151 * We deliberately chose a buffer size of 128, so we won't scribble
152 * over anything important on overflow before we panic.
154 static u32 tlb_handler[128] __cpuinitdata;
156 /* simply assume worst case size for labels and relocs */
157 static struct uasm_label labels[128] __cpuinitdata;
158 static struct uasm_reloc relocs[128] __cpuinitdata;
160 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
162 * CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current,
163 * we cannot do r3000 under these circumstances.
167 * The R3000 TLB handler is simple.
169 static void __cpuinit build_r3000_tlb_refill_handler(void)
171 long pgdc = (long)pgd_current;
174 memset(tlb_handler, 0, sizeof(tlb_handler));
177 uasm_i_mfc0(&p, K0, C0_BADVADDR);
178 uasm_i_lui(&p, K1, uasm_rel_hi(pgdc)); /* cp0 delay */
179 uasm_i_lw(&p, K1, uasm_rel_lo(pgdc), K1);
180 uasm_i_srl(&p, K0, K0, 22); /* load delay */
181 uasm_i_sll(&p, K0, K0, 2);
182 uasm_i_addu(&p, K1, K1, K0);
183 uasm_i_mfc0(&p, K0, C0_CONTEXT);
184 uasm_i_lw(&p, K1, 0, K1); /* cp0 delay */
185 uasm_i_andi(&p, K0, K0, 0xffc); /* load delay */
186 uasm_i_addu(&p, K1, K1, K0);
187 uasm_i_lw(&p, K0, 0, K1);
188 uasm_i_nop(&p); /* load delay */
189 uasm_i_mtc0(&p, K0, C0_ENTRYLO0);
190 uasm_i_mfc0(&p, K1, C0_EPC); /* cp0 delay */
191 uasm_i_tlbwr(&p); /* cp0 delay */
193 uasm_i_rfe(&p); /* branch delay */
195 if (p > tlb_handler + 32)
196 panic("TLB refill handler space exceeded");
198 pr_debug("Wrote TLB refill handler (%u instructions).\n",
199 (unsigned int)(p - tlb_handler));
201 memcpy((void *)ebase, tlb_handler, 0x80);
203 dump_handler((u32 *)ebase, 32);
205 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
208 * The R4000 TLB handler is much more complicated. We have two
209 * consecutive handler areas with 32 instructions space each.
210 * Since they aren't used at the same time, we can overflow in the
211 * other one.To keep things simple, we first assume linear space,
212 * then we relocate it to the final handler layout as needed.
214 static u32 final_handler[64] __cpuinitdata;
219 * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0:
220 * 2. A timing hazard exists for the TLBP instruction.
222 * stalling_instruction
225 * The JTLB is being read for the TLBP throughout the stall generated by the
226 * previous instruction. This is not really correct as the stalling instruction
227 * can modify the address used to access the JTLB. The failure symptom is that
228 * the TLBP instruction will use an address created for the stalling instruction
229 * and not the address held in C0_ENHI and thus report the wrong results.
231 * The software work-around is to not allow the instruction preceding the TLBP
232 * to stall - make it an NOP or some other instruction guaranteed not to stall.
234 * Errata 2 will not be fixed. This errata is also on the R5000.
236 * As if we MIPS hackers wouldn't know how to nop pipelines happy ...
238 static void __cpuinit __maybe_unused build_tlb_probe_entry(u32 **p)
240 switch (current_cpu_type()) {
241 /* Found by experiment: R4600 v2.0/R4700 needs this, too. */
258 * Write random or indexed TLB entry, and care about the hazards from
259 * the preceeding mtc0 and for the following eret.
261 enum tlb_write_entry { tlb_random, tlb_indexed };
263 static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l,
264 struct uasm_reloc **r,
265 enum tlb_write_entry wmode)
267 void(*tlbw)(u32 **) = NULL;
270 case tlb_random: tlbw = uasm_i_tlbwr; break;
271 case tlb_indexed: tlbw = uasm_i_tlbwi; break;
274 if (cpu_has_mips_r2) {
275 if (cpu_has_mips_r2_exec_hazard)
281 switch (current_cpu_type()) {
289 * This branch uses up a mtc0 hazard nop slot and saves
290 * two nops after the tlbw instruction.
292 uasm_il_bgezl(p, r, 0, label_tlbw_hazard);
294 uasm_l_tlbw_hazard(l, *p);
340 uasm_i_nop(p); /* QED specifies 2 nops hazard */
342 * This branch uses up a mtc0 hazard nop slot and saves
343 * a nop after the tlbw instruction.
345 uasm_il_bgezl(p, r, 0, label_tlbw_hazard);
347 uasm_l_tlbw_hazard(l, *p);
360 * When the JTLB is updated by tlbwi or tlbwr, a subsequent
361 * use of the JTLB for instructions should not occur for 4
362 * cpu cycles and use for data translations should not occur
397 panic("No TLB refill handler yet (CPU type: %d)",
398 current_cpu_data.cputype);
403 static __cpuinit __maybe_unused void build_convert_pte_to_entrylo(u32 **p,
406 if (kernel_uses_smartmips_rixi) {
407 UASM_i_SRL(p, reg, reg, ilog2(_PAGE_NO_EXEC));
408 UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
410 #ifdef CONFIG_64BIT_PHYS_ADDR
411 uasm_i_dsrl_safe(p, reg, reg, ilog2(_PAGE_GLOBAL));
413 UASM_i_SRL(p, reg, reg, ilog2(_PAGE_GLOBAL));
418 #ifdef CONFIG_HUGETLB_PAGE
420 static __cpuinit void build_restore_pagemask(u32 **p,
421 struct uasm_reloc **r,
425 /* Reset default page size */
426 if (PM_DEFAULT_MASK >> 16) {
427 uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16);
428 uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff);
429 uasm_il_b(p, r, lid);
430 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
431 } else if (PM_DEFAULT_MASK) {
432 uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK);
433 uasm_il_b(p, r, lid);
434 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
436 uasm_il_b(p, r, lid);
437 uasm_i_mtc0(p, 0, C0_PAGEMASK);
441 static __cpuinit void build_huge_tlb_write_entry(u32 **p,
442 struct uasm_label **l,
443 struct uasm_reloc **r,
445 enum tlb_write_entry wmode)
447 /* Set huge page tlb entry size */
448 uasm_i_lui(p, tmp, PM_HUGE_MASK >> 16);
449 uasm_i_ori(p, tmp, tmp, PM_HUGE_MASK & 0xffff);
450 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
452 build_tlb_write_entry(p, l, r, wmode);
454 build_restore_pagemask(p, r, tmp, label_leave);
458 * Check if Huge PTE is present, if so then jump to LABEL.
460 static void __cpuinit
461 build_is_huge_pte(u32 **p, struct uasm_reloc **r, unsigned int tmp,
462 unsigned int pmd, int lid)
464 UASM_i_LW(p, tmp, 0, pmd);
465 uasm_i_andi(p, tmp, tmp, _PAGE_HUGE);
466 uasm_il_bnez(p, r, tmp, lid);
469 static __cpuinit void build_huge_update_entries(u32 **p,
476 * A huge PTE describes an area the size of the
477 * configured huge page size. This is twice the
478 * of the large TLB entry size we intend to use.
479 * A TLB entry half the size of the configured
480 * huge page size is configured into entrylo0
481 * and entrylo1 to cover the contiguous huge PTE
484 small_sequence = (HPAGE_SIZE >> 7) < 0x10000;
486 /* We can clobber tmp. It isn't used after this.*/
488 uasm_i_lui(p, tmp, HPAGE_SIZE >> (7 + 16));
490 build_convert_pte_to_entrylo(p, pte);
491 UASM_i_MTC0(p, pte, C0_ENTRYLO0); /* load it */
492 /* convert to entrylo1 */
494 UASM_i_ADDIU(p, pte, pte, HPAGE_SIZE >> 7);
496 UASM_i_ADDU(p, pte, pte, tmp);
498 UASM_i_MTC0(p, pte, C0_ENTRYLO1); /* load it */
501 static __cpuinit void build_huge_handler_tail(u32 **p,
502 struct uasm_reloc **r,
503 struct uasm_label **l,
508 UASM_i_SC(p, pte, 0, ptr);
509 uasm_il_beqz(p, r, pte, label_tlb_huge_update);
510 UASM_i_LW(p, pte, 0, ptr); /* Needed because SC killed our PTE */
512 UASM_i_SW(p, pte, 0, ptr);
514 build_huge_update_entries(p, pte, ptr);
515 build_huge_tlb_write_entry(p, l, r, pte, tlb_indexed);
517 #endif /* CONFIG_HUGETLB_PAGE */
521 * TMP and PTR are scratch.
522 * TMP will be clobbered, PTR will hold the pmd entry.
524 static void __cpuinit
525 build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
526 unsigned int tmp, unsigned int ptr)
528 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
529 long pgdc = (long)pgd_current;
532 * The vmalloc handling is not in the hotpath.
534 uasm_i_dmfc0(p, tmp, C0_BADVADDR);
535 uasm_il_bltz(p, r, tmp, label_vmalloc);
536 /* No uasm_i_nop needed here, since the next insn doesn't touch TMP. */
538 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
540 * &pgd << 11 stored in CONTEXT [23..63].
542 UASM_i_MFC0(p, ptr, C0_CONTEXT);
543 uasm_i_dins(p, ptr, 0, 0, 23); /* Clear lower 23 bits of context. */
544 uasm_i_ori(p, ptr, ptr, 0x540); /* 1 0 1 0 1 << 6 xkphys cached */
545 uasm_i_drotr(p, ptr, ptr, 11);
546 #elif defined(CONFIG_SMP)
547 # ifdef CONFIG_MIPS_MT_SMTC
549 * SMTC uses TCBind value as "CPU" index
551 uasm_i_mfc0(p, ptr, C0_TCBIND);
552 uasm_i_dsrl_safe(p, ptr, ptr, 19);
555 * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
558 uasm_i_dmfc0(p, ptr, C0_CONTEXT);
559 uasm_i_dsrl_safe(p, ptr, ptr, 23);
561 UASM_i_LA_mostly(p, tmp, pgdc);
562 uasm_i_daddu(p, ptr, ptr, tmp);
563 uasm_i_dmfc0(p, tmp, C0_BADVADDR);
564 uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr);
566 UASM_i_LA_mostly(p, ptr, pgdc);
567 uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr);
570 uasm_l_vmalloc_done(l, *p);
572 /* get pgd offset in bytes */
573 uasm_i_dsrl_safe(p, tmp, tmp, PGDIR_SHIFT - 3);
575 uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3);
576 uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */
577 #ifndef __PAGETABLE_PMD_FOLDED
578 uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */
579 uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */
580 uasm_i_dsrl_safe(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */
581 uasm_i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3);
582 uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */
587 * BVADDR is the faulting address, PTR is scratch.
588 * PTR will hold the pgd for vmalloc.
590 static void __cpuinit
591 build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
592 unsigned int bvaddr, unsigned int ptr)
594 long swpd = (long)swapper_pg_dir;
596 uasm_l_vmalloc(l, *p);
598 if (uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd)) {
599 uasm_il_b(p, r, label_vmalloc_done);
600 uasm_i_lui(p, ptr, uasm_rel_hi(swpd));
602 UASM_i_LA_mostly(p, ptr, swpd);
603 uasm_il_b(p, r, label_vmalloc_done);
604 if (uasm_in_compat_space_p(swpd))
605 uasm_i_addiu(p, ptr, ptr, uasm_rel_lo(swpd));
607 uasm_i_daddiu(p, ptr, ptr, uasm_rel_lo(swpd));
611 #else /* !CONFIG_64BIT */
614 * TMP and PTR are scratch.
615 * TMP will be clobbered, PTR will hold the pgd entry.
617 static void __cpuinit __maybe_unused
618 build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
620 long pgdc = (long)pgd_current;
622 /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */
624 #ifdef CONFIG_MIPS_MT_SMTC
626 * SMTC uses TCBind value as "CPU" index
628 uasm_i_mfc0(p, ptr, C0_TCBIND);
629 UASM_i_LA_mostly(p, tmp, pgdc);
630 uasm_i_srl(p, ptr, ptr, 19);
633 * smp_processor_id() << 3 is stored in CONTEXT.
635 uasm_i_mfc0(p, ptr, C0_CONTEXT);
636 UASM_i_LA_mostly(p, tmp, pgdc);
637 uasm_i_srl(p, ptr, ptr, 23);
639 uasm_i_addu(p, ptr, tmp, ptr);
641 UASM_i_LA_mostly(p, ptr, pgdc);
643 uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
644 uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
645 uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */
646 uasm_i_sll(p, tmp, tmp, PGD_T_LOG2);
647 uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */
650 #endif /* !CONFIG_64BIT */
652 static void __cpuinit build_adjust_context(u32 **p, unsigned int ctx)
654 unsigned int shift = 4 - (PTE_T_LOG2 + 1) + PAGE_SHIFT - 12;
655 unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1);
657 switch (current_cpu_type()) {
674 UASM_i_SRL(p, ctx, ctx, shift);
675 uasm_i_andi(p, ctx, ctx, mask);
678 static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
681 * Bug workaround for the Nevada. It seems as if under certain
682 * circumstances the move from cp0_context might produce a
683 * bogus result when the mfc0 instruction and its consumer are
684 * in a different cacheline or a load instruction, probably any
685 * memory reference, is between them.
687 switch (current_cpu_type()) {
689 UASM_i_LW(p, ptr, 0, ptr);
690 GET_CONTEXT(p, tmp); /* get context reg */
694 GET_CONTEXT(p, tmp); /* get context reg */
695 UASM_i_LW(p, ptr, 0, ptr);
699 build_adjust_context(p, tmp);
700 UASM_i_ADDU(p, ptr, ptr, tmp); /* add in offset */
703 static void __cpuinit build_update_entries(u32 **p, unsigned int tmp,
707 * 64bit address support (36bit on a 32bit CPU) in a 32bit
708 * Kernel is a special case. Only a few CPUs use it.
710 #ifdef CONFIG_64BIT_PHYS_ADDR
711 if (cpu_has_64bits) {
712 uasm_i_ld(p, tmp, 0, ptep); /* get even pte */
713 uasm_i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
714 if (kernel_uses_smartmips_rixi) {
715 UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC));
716 UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC));
717 UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
718 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
719 UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
721 uasm_i_dsrl_safe(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
722 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
723 uasm_i_dsrl_safe(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
725 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
727 int pte_off_even = sizeof(pte_t) / 2;
728 int pte_off_odd = pte_off_even + sizeof(pte_t);
730 /* The pte entries are pre-shifted */
731 uasm_i_lw(p, tmp, pte_off_even, ptep); /* get even pte */
732 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
733 uasm_i_lw(p, ptep, pte_off_odd, ptep); /* get odd pte */
734 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
737 UASM_i_LW(p, tmp, 0, ptep); /* get even pte */
738 UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
740 build_tlb_probe_entry(p);
741 if (kernel_uses_smartmips_rixi) {
742 UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC));
743 UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC));
744 UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
745 if (r4k_250MHZhwbug())
746 UASM_i_MTC0(p, 0, C0_ENTRYLO0);
747 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
748 UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC));
750 UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
751 if (r4k_250MHZhwbug())
752 UASM_i_MTC0(p, 0, C0_ENTRYLO0);
753 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
754 UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
756 uasm_i_mfc0(p, tmp, C0_INDEX);
758 if (r4k_250MHZhwbug())
759 UASM_i_MTC0(p, 0, C0_ENTRYLO1);
760 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
765 * For a 64-bit kernel, we are using the 64-bit XTLB refill exception
766 * because EXL == 0. If we wrap, we can also use the 32 instruction
767 * slots before the XTLB refill exception handler which belong to the
768 * unused TLB refill exception.
770 #define MIPS64_REFILL_INSNS 32
772 static void __cpuinit build_r4000_tlb_refill_handler(void)
774 u32 *p = tlb_handler;
775 struct uasm_label *l = labels;
776 struct uasm_reloc *r = relocs;
778 unsigned int final_len;
780 memset(tlb_handler, 0, sizeof(tlb_handler));
781 memset(labels, 0, sizeof(labels));
782 memset(relocs, 0, sizeof(relocs));
783 memset(final_handler, 0, sizeof(final_handler));
786 * create the plain linear handler
788 if (bcm1250_m3_war()) {
789 unsigned int segbits = 44;
791 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
792 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
793 uasm_i_xor(&p, K0, K0, K1);
794 uasm_i_dsrl_safe(&p, K1, K0, 62);
795 uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
796 uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
797 uasm_i_or(&p, K0, K0, K1);
798 uasm_il_bnez(&p, &r, K0, label_leave);
799 /* No need for uasm_i_nop */
803 build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
805 build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
808 #ifdef CONFIG_HUGETLB_PAGE
809 build_is_huge_pte(&p, &r, K0, K1, label_tlb_huge_update);
812 build_get_ptep(&p, K0, K1);
813 build_update_entries(&p, K0, K1);
814 build_tlb_write_entry(&p, &l, &r, tlb_random);
816 uasm_i_eret(&p); /* return from trap */
818 #ifdef CONFIG_HUGETLB_PAGE
819 uasm_l_tlb_huge_update(&l, p);
820 UASM_i_LW(&p, K0, 0, K1);
821 build_huge_update_entries(&p, K0, K1);
822 build_huge_tlb_write_entry(&p, &l, &r, K0, tlb_random);
826 build_get_pgd_vmalloc64(&p, &l, &r, K0, K1);
830 * Overflow check: For the 64bit handler, we need at least one
831 * free instruction slot for the wrap-around branch. In worst
832 * case, if the intended insertion point is a delay slot, we
833 * need three, with the second nop'ed and the third being
836 /* Loongson2 ebase is different than r4k, we have more space */
837 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
838 if ((p - tlb_handler) > 64)
839 panic("TLB refill handler space exceeded");
841 if (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 1)
842 || (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 3)
843 && uasm_insn_has_bdelay(relocs,
844 tlb_handler + MIPS64_REFILL_INSNS - 3)))
845 panic("TLB refill handler space exceeded");
849 * Now fold the handler in the TLB refill handler space.
851 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
853 /* Simplest case, just copy the handler. */
854 uasm_copy_handler(relocs, labels, tlb_handler, p, f);
855 final_len = p - tlb_handler;
856 #else /* CONFIG_64BIT */
857 f = final_handler + MIPS64_REFILL_INSNS;
858 if ((p - tlb_handler) <= MIPS64_REFILL_INSNS) {
859 /* Just copy the handler. */
860 uasm_copy_handler(relocs, labels, tlb_handler, p, f);
861 final_len = p - tlb_handler;
863 #if defined(CONFIG_HUGETLB_PAGE)
864 const enum label_id ls = label_tlb_huge_update;
866 const enum label_id ls = label_vmalloc;
872 for (i = 0; i < ARRAY_SIZE(labels) && labels[i].lab != ls; i++)
874 BUG_ON(i == ARRAY_SIZE(labels));
875 split = labels[i].addr;
878 * See if we have overflown one way or the other.
880 if (split > tlb_handler + MIPS64_REFILL_INSNS ||
881 split < p - MIPS64_REFILL_INSNS)
886 * Split two instructions before the end. One
887 * for the branch and one for the instruction
890 split = tlb_handler + MIPS64_REFILL_INSNS - 2;
893 * If the branch would fall in a delay slot,
894 * we must back up an additional instruction
895 * so that it is no longer in a delay slot.
897 if (uasm_insn_has_bdelay(relocs, split - 1))
900 /* Copy first part of the handler. */
901 uasm_copy_handler(relocs, labels, tlb_handler, split, f);
902 f += split - tlb_handler;
906 uasm_l_split(&l, final_handler);
907 uasm_il_b(&f, &r, label_split);
908 if (uasm_insn_has_bdelay(relocs, split))
911 uasm_copy_handler(relocs, labels,
912 split, split + 1, f);
913 uasm_move_labels(labels, f, f + 1, -1);
919 /* Copy the rest of the handler. */
920 uasm_copy_handler(relocs, labels, split, p, final_handler);
921 final_len = (f - (final_handler + MIPS64_REFILL_INSNS)) +
924 #endif /* CONFIG_64BIT */
926 uasm_resolve_relocs(relocs, labels);
927 pr_debug("Wrote TLB refill handler (%u instructions).\n",
930 memcpy((void *)ebase, final_handler, 0x100);
932 dump_handler((u32 *)ebase, 64);
936 * TLB load/store/modify handlers.
938 * Only the fastpath gets synthesized at runtime, the slowpath for
939 * do_page_fault remains normal asm.
941 extern void tlb_do_page_fault_0(void);
942 extern void tlb_do_page_fault_1(void);
945 * 128 instructions for the fastpath handler is generous and should
948 #define FASTPATH_SIZE 128
950 u32 handle_tlbl[FASTPATH_SIZE] __cacheline_aligned;
951 u32 handle_tlbs[FASTPATH_SIZE] __cacheline_aligned;
952 u32 handle_tlbm[FASTPATH_SIZE] __cacheline_aligned;
954 static void __cpuinit
955 iPTE_LW(u32 **p, unsigned int pte, unsigned int ptr)
958 # ifdef CONFIG_64BIT_PHYS_ADDR
960 uasm_i_lld(p, pte, 0, ptr);
963 UASM_i_LL(p, pte, 0, ptr);
965 # ifdef CONFIG_64BIT_PHYS_ADDR
967 uasm_i_ld(p, pte, 0, ptr);
970 UASM_i_LW(p, pte, 0, ptr);
974 static void __cpuinit
975 iPTE_SW(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr,
978 #ifdef CONFIG_64BIT_PHYS_ADDR
979 unsigned int hwmode = mode & (_PAGE_VALID | _PAGE_DIRTY);
982 uasm_i_ori(p, pte, pte, mode);
984 # ifdef CONFIG_64BIT_PHYS_ADDR
986 uasm_i_scd(p, pte, 0, ptr);
989 UASM_i_SC(p, pte, 0, ptr);
991 if (r10000_llsc_war())
992 uasm_il_beqzl(p, r, pte, label_smp_pgtable_change);
994 uasm_il_beqz(p, r, pte, label_smp_pgtable_change);
996 # ifdef CONFIG_64BIT_PHYS_ADDR
997 if (!cpu_has_64bits) {
998 /* no uasm_i_nop needed */
999 uasm_i_ll(p, pte, sizeof(pte_t) / 2, ptr);
1000 uasm_i_ori(p, pte, pte, hwmode);
1001 uasm_i_sc(p, pte, sizeof(pte_t) / 2, ptr);
1002 uasm_il_beqz(p, r, pte, label_smp_pgtable_change);
1003 /* no uasm_i_nop needed */
1004 uasm_i_lw(p, pte, 0, ptr);
1011 # ifdef CONFIG_64BIT_PHYS_ADDR
1013 uasm_i_sd(p, pte, 0, ptr);
1016 UASM_i_SW(p, pte, 0, ptr);
1018 # ifdef CONFIG_64BIT_PHYS_ADDR
1019 if (!cpu_has_64bits) {
1020 uasm_i_lw(p, pte, sizeof(pte_t) / 2, ptr);
1021 uasm_i_ori(p, pte, pte, hwmode);
1022 uasm_i_sw(p, pte, sizeof(pte_t) / 2, ptr);
1023 uasm_i_lw(p, pte, 0, ptr);
1030 * Check if PTE is present, if not then jump to LABEL. PTR points to
1031 * the page table where this PTE is located, PTE will be re-loaded
1032 * with it's original value.
1034 static void __cpuinit
1035 build_pte_present(u32 **p, struct uasm_reloc **r,
1036 unsigned int pte, unsigned int ptr, enum label_id lid)
1038 if (kernel_uses_smartmips_rixi) {
1039 uasm_i_andi(p, pte, pte, _PAGE_PRESENT);
1040 uasm_il_beqz(p, r, pte, lid);
1042 uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_READ);
1043 uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_READ);
1044 uasm_il_bnez(p, r, pte, lid);
1046 iPTE_LW(p, pte, ptr);
1049 /* Make PTE valid, store result in PTR. */
1050 static void __cpuinit
1051 build_make_valid(u32 **p, struct uasm_reloc **r, unsigned int pte,
1054 unsigned int mode = _PAGE_VALID | _PAGE_ACCESSED;
1056 iPTE_SW(p, r, pte, ptr, mode);
1060 * Check if PTE can be written to, if not branch to LABEL. Regardless
1061 * restore PTE with value from PTR when done.
1063 static void __cpuinit
1064 build_pte_writable(u32 **p, struct uasm_reloc **r,
1065 unsigned int pte, unsigned int ptr, enum label_id lid)
1067 uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
1068 uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
1069 uasm_il_bnez(p, r, pte, lid);
1070 iPTE_LW(p, pte, ptr);
1073 /* Make PTE writable, update software status bits as well, then store
1076 static void __cpuinit
1077 build_make_write(u32 **p, struct uasm_reloc **r, unsigned int pte,
1080 unsigned int mode = (_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID
1083 iPTE_SW(p, r, pte, ptr, mode);
1087 * Check if PTE can be modified, if not branch to LABEL. Regardless
1088 * restore PTE with value from PTR when done.
1090 static void __cpuinit
1091 build_pte_modifiable(u32 **p, struct uasm_reloc **r,
1092 unsigned int pte, unsigned int ptr, enum label_id lid)
1094 uasm_i_andi(p, pte, pte, _PAGE_WRITE);
1095 uasm_il_beqz(p, r, pte, lid);
1096 iPTE_LW(p, pte, ptr);
1099 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
1101 * R3000 style TLB load/store/modify handlers.
1105 * This places the pte into ENTRYLO0 and writes it with tlbwi.
1108 static void __cpuinit
1109 build_r3000_pte_reload_tlbwi(u32 **p, unsigned int pte, unsigned int tmp)
1111 uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1112 uasm_i_mfc0(p, tmp, C0_EPC); /* cp0 delay */
1115 uasm_i_rfe(p); /* branch delay */
1119 * This places the pte into ENTRYLO0 and writes it with tlbwi
1120 * or tlbwr as appropriate. This is because the index register
1121 * may have the probe fail bit set as a result of a trap on a
1122 * kseg2 access, i.e. without refill. Then it returns.
1124 static void __cpuinit
1125 build_r3000_tlb_reload_write(u32 **p, struct uasm_label **l,
1126 struct uasm_reloc **r, unsigned int pte,
1129 uasm_i_mfc0(p, tmp, C0_INDEX);
1130 uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1131 uasm_il_bltz(p, r, tmp, label_r3000_write_probe_fail); /* cp0 delay */
1132 uasm_i_mfc0(p, tmp, C0_EPC); /* branch delay */
1133 uasm_i_tlbwi(p); /* cp0 delay */
1135 uasm_i_rfe(p); /* branch delay */
1136 uasm_l_r3000_write_probe_fail(l, *p);
1137 uasm_i_tlbwr(p); /* cp0 delay */
1139 uasm_i_rfe(p); /* branch delay */
1142 static void __cpuinit
1143 build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte,
1146 long pgdc = (long)pgd_current;
1148 uasm_i_mfc0(p, pte, C0_BADVADDR);
1149 uasm_i_lui(p, ptr, uasm_rel_hi(pgdc)); /* cp0 delay */
1150 uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
1151 uasm_i_srl(p, pte, pte, 22); /* load delay */
1152 uasm_i_sll(p, pte, pte, 2);
1153 uasm_i_addu(p, ptr, ptr, pte);
1154 uasm_i_mfc0(p, pte, C0_CONTEXT);
1155 uasm_i_lw(p, ptr, 0, ptr); /* cp0 delay */
1156 uasm_i_andi(p, pte, pte, 0xffc); /* load delay */
1157 uasm_i_addu(p, ptr, ptr, pte);
1158 uasm_i_lw(p, pte, 0, ptr);
1159 uasm_i_tlbp(p); /* load delay */
1162 static void __cpuinit build_r3000_tlb_load_handler(void)
1164 u32 *p = handle_tlbl;
1165 struct uasm_label *l = labels;
1166 struct uasm_reloc *r = relocs;
1168 memset(handle_tlbl, 0, sizeof(handle_tlbl));
1169 memset(labels, 0, sizeof(labels));
1170 memset(relocs, 0, sizeof(relocs));
1172 build_r3000_tlbchange_handler_head(&p, K0, K1);
1173 build_pte_present(&p, &r, K0, K1, label_nopage_tlbl);
1174 uasm_i_nop(&p); /* load delay */
1175 build_make_valid(&p, &r, K0, K1);
1176 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
1178 uasm_l_nopage_tlbl(&l, p);
1179 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
1182 if ((p - handle_tlbl) > FASTPATH_SIZE)
1183 panic("TLB load handler fastpath space exceeded");
1185 uasm_resolve_relocs(relocs, labels);
1186 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
1187 (unsigned int)(p - handle_tlbl));
1189 dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl));
1192 static void __cpuinit build_r3000_tlb_store_handler(void)
1194 u32 *p = handle_tlbs;
1195 struct uasm_label *l = labels;
1196 struct uasm_reloc *r = relocs;
1198 memset(handle_tlbs, 0, sizeof(handle_tlbs));
1199 memset(labels, 0, sizeof(labels));
1200 memset(relocs, 0, sizeof(relocs));
1202 build_r3000_tlbchange_handler_head(&p, K0, K1);
1203 build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs);
1204 uasm_i_nop(&p); /* load delay */
1205 build_make_write(&p, &r, K0, K1);
1206 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
1208 uasm_l_nopage_tlbs(&l, p);
1209 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1212 if ((p - handle_tlbs) > FASTPATH_SIZE)
1213 panic("TLB store handler fastpath space exceeded");
1215 uasm_resolve_relocs(relocs, labels);
1216 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
1217 (unsigned int)(p - handle_tlbs));
1219 dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs));
1222 static void __cpuinit build_r3000_tlb_modify_handler(void)
1224 u32 *p = handle_tlbm;
1225 struct uasm_label *l = labels;
1226 struct uasm_reloc *r = relocs;
1228 memset(handle_tlbm, 0, sizeof(handle_tlbm));
1229 memset(labels, 0, sizeof(labels));
1230 memset(relocs, 0, sizeof(relocs));
1232 build_r3000_tlbchange_handler_head(&p, K0, K1);
1233 build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm);
1234 uasm_i_nop(&p); /* load delay */
1235 build_make_write(&p, &r, K0, K1);
1236 build_r3000_pte_reload_tlbwi(&p, K0, K1);
1238 uasm_l_nopage_tlbm(&l, p);
1239 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1242 if ((p - handle_tlbm) > FASTPATH_SIZE)
1243 panic("TLB modify handler fastpath space exceeded");
1245 uasm_resolve_relocs(relocs, labels);
1246 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
1247 (unsigned int)(p - handle_tlbm));
1249 dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm));
1251 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
1254 * R4000 style TLB load/store/modify handlers.
1256 static void __cpuinit
1257 build_r4000_tlbchange_handler_head(u32 **p, struct uasm_label **l,
1258 struct uasm_reloc **r, unsigned int pte,
1262 build_get_pmde64(p, l, r, pte, ptr); /* get pmd in ptr */
1264 build_get_pgde32(p, pte, ptr); /* get pgd in ptr */
1267 #ifdef CONFIG_HUGETLB_PAGE
1269 * For huge tlb entries, pmd doesn't contain an address but
1270 * instead contains the tlb pte. Check the PAGE_HUGE bit and
1271 * see if we need to jump to huge tlb processing.
1273 build_is_huge_pte(p, r, pte, ptr, label_tlb_huge_update);
1276 UASM_i_MFC0(p, pte, C0_BADVADDR);
1277 UASM_i_LW(p, ptr, 0, ptr);
1278 UASM_i_SRL(p, pte, pte, PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2);
1279 uasm_i_andi(p, pte, pte, (PTRS_PER_PTE - 1) << PTE_T_LOG2);
1280 UASM_i_ADDU(p, ptr, ptr, pte);
1283 uasm_l_smp_pgtable_change(l, *p);
1285 iPTE_LW(p, pte, ptr); /* get even pte */
1286 if (!m4kc_tlbp_war())
1287 build_tlb_probe_entry(p);
1290 static void __cpuinit
1291 build_r4000_tlbchange_handler_tail(u32 **p, struct uasm_label **l,
1292 struct uasm_reloc **r, unsigned int tmp,
1295 uasm_i_ori(p, ptr, ptr, sizeof(pte_t));
1296 uasm_i_xori(p, ptr, ptr, sizeof(pte_t));
1297 build_update_entries(p, tmp, ptr);
1298 build_tlb_write_entry(p, l, r, tlb_indexed);
1299 uasm_l_leave(l, *p);
1300 uasm_i_eret(p); /* return from trap */
1303 build_get_pgd_vmalloc64(p, l, r, tmp, ptr);
1307 static void __cpuinit build_r4000_tlb_load_handler(void)
1309 u32 *p = handle_tlbl;
1310 struct uasm_label *l = labels;
1311 struct uasm_reloc *r = relocs;
1313 memset(handle_tlbl, 0, sizeof(handle_tlbl));
1314 memset(labels, 0, sizeof(labels));
1315 memset(relocs, 0, sizeof(relocs));
1317 if (bcm1250_m3_war()) {
1318 unsigned int segbits = 44;
1320 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
1321 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
1322 uasm_i_xor(&p, K0, K0, K1);
1323 uasm_i_dsrl_safe(&p, K1, K0, 62);
1324 uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
1325 uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
1326 uasm_i_or(&p, K0, K0, K1);
1327 uasm_il_bnez(&p, &r, K0, label_leave);
1328 /* No need for uasm_i_nop */
1331 build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1);
1332 build_pte_present(&p, &r, K0, K1, label_nopage_tlbl);
1333 if (m4kc_tlbp_war())
1334 build_tlb_probe_entry(&p);
1336 if (kernel_uses_smartmips_rixi) {
1338 * If the page is not _PAGE_VALID, RI or XI could not
1339 * have triggered it. Skip the expensive test..
1341 uasm_i_andi(&p, K0, K0, _PAGE_VALID);
1342 uasm_il_beqz(&p, &r, K0, label_tlbl_goaround1);
1346 /* Examine entrylo 0 or 1 based on ptr. */
1347 uasm_i_andi(&p, K0, K1, sizeof(pte_t));
1348 uasm_i_beqz(&p, K0, 8);
1350 UASM_i_MFC0(&p, K0, C0_ENTRYLO0); /* load it in the delay slot*/
1351 UASM_i_MFC0(&p, K0, C0_ENTRYLO1); /* load it if ptr is odd */
1353 * If the entryLo (now in K0) is valid (bit 1), RI or
1354 * XI must have triggered it.
1356 uasm_i_andi(&p, K0, K0, 2);
1357 uasm_il_bnez(&p, &r, K0, label_nopage_tlbl);
1359 uasm_l_tlbl_goaround1(&l, p);
1360 /* Reload the PTE value */
1361 iPTE_LW(&p, K0, K1);
1363 build_make_valid(&p, &r, K0, K1);
1364 build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1);
1366 #ifdef CONFIG_HUGETLB_PAGE
1368 * This is the entry point when build_r4000_tlbchange_handler_head
1369 * spots a huge page.
1371 uasm_l_tlb_huge_update(&l, p);
1372 iPTE_LW(&p, K0, K1);
1373 build_pte_present(&p, &r, K0, K1, label_nopage_tlbl);
1374 build_tlb_probe_entry(&p);
1376 if (kernel_uses_smartmips_rixi) {
1378 * If the page is not _PAGE_VALID, RI or XI could not
1379 * have triggered it. Skip the expensive test..
1381 uasm_i_andi(&p, K0, K0, _PAGE_VALID);
1382 uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2);
1386 /* Examine entrylo 0 or 1 based on ptr. */
1387 uasm_i_andi(&p, K0, K1, sizeof(pte_t));
1388 uasm_i_beqz(&p, K0, 8);
1390 UASM_i_MFC0(&p, K0, C0_ENTRYLO0); /* load it in the delay slot*/
1391 UASM_i_MFC0(&p, K0, C0_ENTRYLO1); /* load it if ptr is odd */
1393 * If the entryLo (now in K0) is valid (bit 1), RI or
1394 * XI must have triggered it.
1396 uasm_i_andi(&p, K0, K0, 2);
1397 uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2);
1398 /* Reload the PTE value */
1399 iPTE_LW(&p, K0, K1);
1402 * We clobbered C0_PAGEMASK, restore it. On the other branch
1403 * it is restored in build_huge_tlb_write_entry.
1405 build_restore_pagemask(&p, &r, K0, label_nopage_tlbl);
1407 uasm_l_tlbl_goaround2(&l, p);
1409 uasm_i_ori(&p, K0, K0, (_PAGE_ACCESSED | _PAGE_VALID));
1410 build_huge_handler_tail(&p, &r, &l, K0, K1);
1413 uasm_l_nopage_tlbl(&l, p);
1414 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
1417 if ((p - handle_tlbl) > FASTPATH_SIZE)
1418 panic("TLB load handler fastpath space exceeded");
1420 uasm_resolve_relocs(relocs, labels);
1421 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
1422 (unsigned int)(p - handle_tlbl));
1424 dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl));
1427 static void __cpuinit build_r4000_tlb_store_handler(void)
1429 u32 *p = handle_tlbs;
1430 struct uasm_label *l = labels;
1431 struct uasm_reloc *r = relocs;
1433 memset(handle_tlbs, 0, sizeof(handle_tlbs));
1434 memset(labels, 0, sizeof(labels));
1435 memset(relocs, 0, sizeof(relocs));
1437 build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1);
1438 build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs);
1439 if (m4kc_tlbp_war())
1440 build_tlb_probe_entry(&p);
1441 build_make_write(&p, &r, K0, K1);
1442 build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1);
1444 #ifdef CONFIG_HUGETLB_PAGE
1446 * This is the entry point when
1447 * build_r4000_tlbchange_handler_head spots a huge page.
1449 uasm_l_tlb_huge_update(&l, p);
1450 iPTE_LW(&p, K0, K1);
1451 build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs);
1452 build_tlb_probe_entry(&p);
1453 uasm_i_ori(&p, K0, K0,
1454 _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
1455 build_huge_handler_tail(&p, &r, &l, K0, K1);
1458 uasm_l_nopage_tlbs(&l, p);
1459 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1462 if ((p - handle_tlbs) > FASTPATH_SIZE)
1463 panic("TLB store handler fastpath space exceeded");
1465 uasm_resolve_relocs(relocs, labels);
1466 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
1467 (unsigned int)(p - handle_tlbs));
1469 dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs));
1472 static void __cpuinit build_r4000_tlb_modify_handler(void)
1474 u32 *p = handle_tlbm;
1475 struct uasm_label *l = labels;
1476 struct uasm_reloc *r = relocs;
1478 memset(handle_tlbm, 0, sizeof(handle_tlbm));
1479 memset(labels, 0, sizeof(labels));
1480 memset(relocs, 0, sizeof(relocs));
1482 build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1);
1483 build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm);
1484 if (m4kc_tlbp_war())
1485 build_tlb_probe_entry(&p);
1486 /* Present and writable bits set, set accessed and dirty bits. */
1487 build_make_write(&p, &r, K0, K1);
1488 build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1);
1490 #ifdef CONFIG_HUGETLB_PAGE
1492 * This is the entry point when
1493 * build_r4000_tlbchange_handler_head spots a huge page.
1495 uasm_l_tlb_huge_update(&l, p);
1496 iPTE_LW(&p, K0, K1);
1497 build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm);
1498 build_tlb_probe_entry(&p);
1499 uasm_i_ori(&p, K0, K0,
1500 _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
1501 build_huge_handler_tail(&p, &r, &l, K0, K1);
1504 uasm_l_nopage_tlbm(&l, p);
1505 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1508 if ((p - handle_tlbm) > FASTPATH_SIZE)
1509 panic("TLB modify handler fastpath space exceeded");
1511 uasm_resolve_relocs(relocs, labels);
1512 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
1513 (unsigned int)(p - handle_tlbm));
1515 dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm));
1518 void __cpuinit build_tlb_refill_handler(void)
1521 * The refill handler is generated per-CPU, multi-node systems
1522 * may have local storage for it. The other handlers are only
1525 static int run_once = 0;
1527 switch (current_cpu_type()) {
1535 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
1536 build_r3000_tlb_refill_handler();
1538 build_r3000_tlb_load_handler();
1539 build_r3000_tlb_store_handler();
1540 build_r3000_tlb_modify_handler();
1544 panic("No R3000 TLB refill handler");
1550 panic("No R6000 TLB refill handler yet");
1554 panic("No R8000 TLB refill handler yet");
1558 build_r4000_tlb_refill_handler();
1560 build_r4000_tlb_load_handler();
1561 build_r4000_tlb_store_handler();
1562 build_r4000_tlb_modify_handler();
1568 void __cpuinit flush_tlb_handlers(void)
1570 local_flush_icache_range((unsigned long)handle_tlbl,
1571 (unsigned long)handle_tlbl + sizeof(handle_tlbl));
1572 local_flush_icache_range((unsigned long)handle_tlbs,
1573 (unsigned long)handle_tlbs + sizeof(handle_tlbs));
1574 local_flush_icache_range((unsigned long)handle_tlbm,
1575 (unsigned long)handle_tlbm + sizeof(handle_tlbm));