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.
12 * Copyright (C) 2011 MIPS Technologies, Inc.
14 * ... and the days got worse and worse and now you see
15 * I've gone completly out of my mind.
17 * They're coming to take me a away haha
18 * they're coming to take me a away hoho hihi haha
19 * to the funny farm where code is beautiful all the time ...
21 * (Condolences to Napoleon XIV)
24 #include <linux/bug.h>
25 #include <linux/kernel.h>
26 #include <linux/types.h>
27 #include <linux/smp.h>
28 #include <linux/string.h>
29 #include <linux/init.h>
30 #include <linux/cache.h>
32 #include <asm/cacheflush.h>
33 #include <asm/pgtable.h>
36 #include <asm/setup.h>
39 * TLB load/store/modify handlers.
41 * Only the fastpath gets synthesized at runtime, the slowpath for
42 * do_page_fault remains normal asm.
44 extern void tlb_do_page_fault_0(void);
45 extern void tlb_do_page_fault_1(void);
47 struct work_registers {
56 } ____cacheline_aligned_in_smp;
58 static struct tlb_reg_save handler_reg_save[NR_CPUS];
60 static inline int r45k_bvahwbug(void)
62 /* XXX: We should probe for the presence of this bug, but we don't. */
66 static inline int r4k_250MHZhwbug(void)
68 /* XXX: We should probe for the presence of this bug, but we don't. */
72 static inline int __maybe_unused bcm1250_m3_war(void)
74 return BCM1250_M3_WAR;
77 static inline int __maybe_unused r10000_llsc_war(void)
79 return R10000_LLSC_WAR;
82 static int use_bbit_insns(void)
84 switch (current_cpu_type()) {
85 case CPU_CAVIUM_OCTEON:
86 case CPU_CAVIUM_OCTEON_PLUS:
87 case CPU_CAVIUM_OCTEON2:
94 static int use_lwx_insns(void)
96 switch (current_cpu_type()) {
97 case CPU_CAVIUM_OCTEON2:
103 #if defined(CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE) && \
104 CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0
105 static bool scratchpad_available(void)
109 static int scratchpad_offset(int i)
112 * CVMSEG starts at address -32768 and extends for
113 * CAVIUM_OCTEON_CVMSEG_SIZE 128 byte cache lines.
115 i += 1; /* Kernel use starts at the top and works down. */
116 return CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE * 128 - (8 * i) - 32768;
119 static bool scratchpad_available(void)
123 static int scratchpad_offset(int i)
126 /* Really unreachable, but evidently some GCC want this. */
131 * Found by experiment: At least some revisions of the 4kc throw under
132 * some circumstances a machine check exception, triggered by invalid
133 * values in the index register. Delaying the tlbp instruction until
134 * after the next branch, plus adding an additional nop in front of
135 * tlbwi/tlbwr avoids the invalid index register values. Nobody knows
136 * why; it's not an issue caused by the core RTL.
139 static int m4kc_tlbp_war(void)
141 return (current_cpu_data.processor_id & 0xffff00) ==
142 (PRID_COMP_MIPS | PRID_IMP_4KC);
145 /* Handle labels (which must be positive integers). */
147 label_second_part = 1,
152 label_split = label_tlbw_hazard_0 + 8,
153 label_tlbl_goaround1,
154 label_tlbl_goaround2,
158 label_smp_pgtable_change,
159 label_r3000_write_probe_fail,
160 label_large_segbits_fault,
161 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
162 label_tlb_huge_update,
166 UASM_L_LA(_second_part)
169 UASM_L_LA(_vmalloc_done)
170 /* _tlbw_hazard_x is handled differently. */
172 UASM_L_LA(_tlbl_goaround1)
173 UASM_L_LA(_tlbl_goaround2)
174 UASM_L_LA(_nopage_tlbl)
175 UASM_L_LA(_nopage_tlbs)
176 UASM_L_LA(_nopage_tlbm)
177 UASM_L_LA(_smp_pgtable_change)
178 UASM_L_LA(_r3000_write_probe_fail)
179 UASM_L_LA(_large_segbits_fault)
180 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
181 UASM_L_LA(_tlb_huge_update)
184 static int hazard_instance;
186 static void uasm_bgezl_hazard(u32 **p, struct uasm_reloc **r, int instance)
190 uasm_il_bgezl(p, r, 0, label_tlbw_hazard_0 + instance);
197 static void uasm_bgezl_label(struct uasm_label **l, u32 **p, int instance)
201 uasm_build_label(l, *p, label_tlbw_hazard_0 + instance);
209 * pgtable bits are assigned dynamically depending on processor feature
210 * and statically based on kernel configuration. This spits out the actual
211 * values the kernel is using. Required to make sense from disassembled
212 * TLB exception handlers.
214 static void output_pgtable_bits_defines(void)
216 #define pr_define(fmt, ...) \
217 pr_debug("#define " fmt, ##__VA_ARGS__)
219 pr_debug("#include <asm/asm.h>\n");
220 pr_debug("#include <asm/regdef.h>\n");
223 pr_define("_PAGE_PRESENT_SHIFT %d\n", _PAGE_PRESENT_SHIFT);
224 pr_define("_PAGE_READ_SHIFT %d\n", _PAGE_READ_SHIFT);
225 pr_define("_PAGE_WRITE_SHIFT %d\n", _PAGE_WRITE_SHIFT);
226 pr_define("_PAGE_ACCESSED_SHIFT %d\n", _PAGE_ACCESSED_SHIFT);
227 pr_define("_PAGE_MODIFIED_SHIFT %d\n", _PAGE_MODIFIED_SHIFT);
228 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
229 pr_define("_PAGE_HUGE_SHIFT %d\n", _PAGE_HUGE_SHIFT);
230 pr_define("_PAGE_SPLITTING_SHIFT %d\n", _PAGE_SPLITTING_SHIFT);
233 #ifdef _PAGE_NO_EXEC_SHIFT
234 pr_define("_PAGE_NO_EXEC_SHIFT %d\n", _PAGE_NO_EXEC_SHIFT);
236 #ifdef _PAGE_NO_READ_SHIFT
237 pr_define("_PAGE_NO_READ_SHIFT %d\n", _PAGE_NO_READ_SHIFT);
240 pr_define("_PAGE_GLOBAL_SHIFT %d\n", _PAGE_GLOBAL_SHIFT);
241 pr_define("_PAGE_VALID_SHIFT %d\n", _PAGE_VALID_SHIFT);
242 pr_define("_PAGE_DIRTY_SHIFT %d\n", _PAGE_DIRTY_SHIFT);
243 pr_define("_PFN_SHIFT %d\n", _PFN_SHIFT);
247 static inline void dump_handler(const char *symbol, const u32 *handler, int count)
251 pr_debug("LEAF(%s)\n", symbol);
253 pr_debug("\t.set push\n");
254 pr_debug("\t.set noreorder\n");
256 for (i = 0; i < count; i++)
257 pr_debug("\t.word\t0x%08x\t\t# %p\n", handler[i], &handler[i]);
259 pr_debug("\t.set\tpop\n");
261 pr_debug("\tEND(%s)\n", symbol);
264 /* The only general purpose registers allowed in TLB handlers. */
268 /* Some CP0 registers */
269 #define C0_INDEX 0, 0
270 #define C0_ENTRYLO0 2, 0
271 #define C0_TCBIND 2, 2
272 #define C0_ENTRYLO1 3, 0
273 #define C0_CONTEXT 4, 0
274 #define C0_PAGEMASK 5, 0
275 #define C0_BADVADDR 8, 0
276 #define C0_ENTRYHI 10, 0
278 #define C0_XCONTEXT 20, 0
281 # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_XCONTEXT)
283 # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_CONTEXT)
286 /* The worst case length of the handler is around 18 instructions for
287 * R3000-style TLBs and up to 63 instructions for R4000-style TLBs.
288 * Maximum space available is 32 instructions for R3000 and 64
289 * instructions for R4000.
291 * We deliberately chose a buffer size of 128, so we won't scribble
292 * over anything important on overflow before we panic.
294 static u32 tlb_handler[128];
296 /* simply assume worst case size for labels and relocs */
297 static struct uasm_label labels[128];
298 static struct uasm_reloc relocs[128];
300 static int check_for_high_segbits;
302 static unsigned int kscratch_used_mask;
304 static inline int __maybe_unused c0_kscratch(void)
306 switch (current_cpu_type()) {
315 static int allocate_kscratch(void)
318 unsigned int a = cpu_data[0].kscratch_mask & ~kscratch_used_mask;
325 r--; /* make it zero based */
327 kscratch_used_mask |= (1 << r);
332 static int scratch_reg;
334 enum vmalloc64_mode {not_refill, refill_scratch, refill_noscratch};
336 static struct work_registers build_get_work_registers(u32 **p)
338 struct work_registers r;
340 int smp_processor_id_reg;
341 int smp_processor_id_sel;
342 int smp_processor_id_shift;
344 if (scratch_reg >= 0) {
345 /* Save in CPU local C0_KScratch? */
346 UASM_i_MTC0(p, 1, c0_kscratch(), scratch_reg);
353 if (num_possible_cpus() > 1) {
354 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
355 smp_processor_id_shift = 51;
356 smp_processor_id_reg = 20; /* XContext */
357 smp_processor_id_sel = 0;
360 smp_processor_id_shift = 25;
361 smp_processor_id_reg = 4; /* Context */
362 smp_processor_id_sel = 0;
365 smp_processor_id_shift = 26;
366 smp_processor_id_reg = 4; /* Context */
367 smp_processor_id_sel = 0;
370 /* Get smp_processor_id */
371 UASM_i_MFC0(p, K0, smp_processor_id_reg, smp_processor_id_sel);
372 UASM_i_SRL_SAFE(p, K0, K0, smp_processor_id_shift);
374 /* handler_reg_save index in K0 */
375 UASM_i_SLL(p, K0, K0, ilog2(sizeof(struct tlb_reg_save)));
377 UASM_i_LA(p, K1, (long)&handler_reg_save);
378 UASM_i_ADDU(p, K0, K0, K1);
380 UASM_i_LA(p, K0, (long)&handler_reg_save);
382 /* K0 now points to save area, save $1 and $2 */
383 UASM_i_SW(p, 1, offsetof(struct tlb_reg_save, a), K0);
384 UASM_i_SW(p, 2, offsetof(struct tlb_reg_save, b), K0);
392 static void build_restore_work_registers(u32 **p)
394 if (scratch_reg >= 0) {
395 UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg);
398 /* K0 already points to save area, restore $1 and $2 */
399 UASM_i_LW(p, 1, offsetof(struct tlb_reg_save, a), K0);
400 UASM_i_LW(p, 2, offsetof(struct tlb_reg_save, b), K0);
403 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
406 * CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current,
407 * we cannot do r3000 under these circumstances.
409 * Declare pgd_current here instead of including mmu_context.h to avoid type
410 * conflicts for tlbmiss_handler_setup_pgd
412 extern unsigned long pgd_current[];
415 * The R3000 TLB handler is simple.
417 static void build_r3000_tlb_refill_handler(void)
419 long pgdc = (long)pgd_current;
422 memset(tlb_handler, 0, sizeof(tlb_handler));
425 uasm_i_mfc0(&p, K0, C0_BADVADDR);
426 uasm_i_lui(&p, K1, uasm_rel_hi(pgdc)); /* cp0 delay */
427 uasm_i_lw(&p, K1, uasm_rel_lo(pgdc), K1);
428 uasm_i_srl(&p, K0, K0, 22); /* load delay */
429 uasm_i_sll(&p, K0, K0, 2);
430 uasm_i_addu(&p, K1, K1, K0);
431 uasm_i_mfc0(&p, K0, C0_CONTEXT);
432 uasm_i_lw(&p, K1, 0, K1); /* cp0 delay */
433 uasm_i_andi(&p, K0, K0, 0xffc); /* load delay */
434 uasm_i_addu(&p, K1, K1, K0);
435 uasm_i_lw(&p, K0, 0, K1);
436 uasm_i_nop(&p); /* load delay */
437 uasm_i_mtc0(&p, K0, C0_ENTRYLO0);
438 uasm_i_mfc0(&p, K1, C0_EPC); /* cp0 delay */
439 uasm_i_tlbwr(&p); /* cp0 delay */
441 uasm_i_rfe(&p); /* branch delay */
443 if (p > tlb_handler + 32)
444 panic("TLB refill handler space exceeded");
446 pr_debug("Wrote TLB refill handler (%u instructions).\n",
447 (unsigned int)(p - tlb_handler));
449 memcpy((void *)ebase, tlb_handler, 0x80);
451 dump_handler("r3000_tlb_refill", (u32 *)ebase, 32);
453 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
456 * The R4000 TLB handler is much more complicated. We have two
457 * consecutive handler areas with 32 instructions space each.
458 * Since they aren't used at the same time, we can overflow in the
459 * other one.To keep things simple, we first assume linear space,
460 * then we relocate it to the final handler layout as needed.
462 static u32 final_handler[64];
467 * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0:
468 * 2. A timing hazard exists for the TLBP instruction.
470 * stalling_instruction
473 * The JTLB is being read for the TLBP throughout the stall generated by the
474 * previous instruction. This is not really correct as the stalling instruction
475 * can modify the address used to access the JTLB. The failure symptom is that
476 * the TLBP instruction will use an address created for the stalling instruction
477 * and not the address held in C0_ENHI and thus report the wrong results.
479 * The software work-around is to not allow the instruction preceding the TLBP
480 * to stall - make it an NOP or some other instruction guaranteed not to stall.
482 * Errata 2 will not be fixed. This errata is also on the R5000.
484 * As if we MIPS hackers wouldn't know how to nop pipelines happy ...
486 static void __maybe_unused build_tlb_probe_entry(u32 **p)
488 switch (current_cpu_type()) {
489 /* Found by experiment: R4600 v2.0/R4700 needs this, too. */
505 * Write random or indexed TLB entry, and care about the hazards from
506 * the preceding mtc0 and for the following eret.
508 enum tlb_write_entry { tlb_random, tlb_indexed };
510 static void build_tlb_write_entry(u32 **p, struct uasm_label **l,
511 struct uasm_reloc **r,
512 enum tlb_write_entry wmode)
514 void(*tlbw)(u32 **) = NULL;
517 case tlb_random: tlbw = uasm_i_tlbwr; break;
518 case tlb_indexed: tlbw = uasm_i_tlbwi; break;
521 if (cpu_has_mips_r2) {
523 * The architecture spec says an ehb is required here,
524 * but a number of cores do not have the hazard and
525 * using an ehb causes an expensive pipeline stall.
527 switch (current_cpu_type()) {
540 switch (current_cpu_type()) {
548 * This branch uses up a mtc0 hazard nop slot and saves
549 * two nops after the tlbw instruction.
551 uasm_bgezl_hazard(p, r, hazard_instance);
553 uasm_bgezl_label(l, p, hazard_instance);
567 uasm_i_nop(p); /* QED specifies 2 nops hazard */
568 uasm_i_nop(p); /* QED specifies 2 nops hazard */
640 panic("No TLB refill handler yet (CPU type: %d)",
641 current_cpu_data.cputype);
646 static __maybe_unused void build_convert_pte_to_entrylo(u32 **p,
650 UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL));
652 #ifdef CONFIG_64BIT_PHYS_ADDR
653 uasm_i_dsrl_safe(p, reg, reg, ilog2(_PAGE_GLOBAL));
655 UASM_i_SRL(p, reg, reg, ilog2(_PAGE_GLOBAL));
660 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
662 static void build_restore_pagemask(u32 **p, struct uasm_reloc **r,
663 unsigned int tmp, enum label_id lid,
666 if (restore_scratch) {
667 /* Reset default page size */
668 if (PM_DEFAULT_MASK >> 16) {
669 uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16);
670 uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff);
671 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
672 uasm_il_b(p, r, lid);
673 } else if (PM_DEFAULT_MASK) {
674 uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK);
675 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
676 uasm_il_b(p, r, lid);
678 uasm_i_mtc0(p, 0, C0_PAGEMASK);
679 uasm_il_b(p, r, lid);
681 if (scratch_reg >= 0)
682 UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg);
684 UASM_i_LW(p, 1, scratchpad_offset(0), 0);
686 /* Reset default page size */
687 if (PM_DEFAULT_MASK >> 16) {
688 uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16);
689 uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff);
690 uasm_il_b(p, r, lid);
691 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
692 } else if (PM_DEFAULT_MASK) {
693 uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK);
694 uasm_il_b(p, r, lid);
695 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
697 uasm_il_b(p, r, lid);
698 uasm_i_mtc0(p, 0, C0_PAGEMASK);
703 static void build_huge_tlb_write_entry(u32 **p, struct uasm_label **l,
704 struct uasm_reloc **r,
706 enum tlb_write_entry wmode,
709 /* Set huge page tlb entry size */
710 uasm_i_lui(p, tmp, PM_HUGE_MASK >> 16);
711 uasm_i_ori(p, tmp, tmp, PM_HUGE_MASK & 0xffff);
712 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
714 build_tlb_write_entry(p, l, r, wmode);
716 build_restore_pagemask(p, r, tmp, label_leave, restore_scratch);
720 * Check if Huge PTE is present, if so then jump to LABEL.
723 build_is_huge_pte(u32 **p, struct uasm_reloc **r, unsigned int tmp,
724 unsigned int pmd, int lid)
726 UASM_i_LW(p, tmp, 0, pmd);
727 if (use_bbit_insns()) {
728 uasm_il_bbit1(p, r, tmp, ilog2(_PAGE_HUGE), lid);
730 uasm_i_andi(p, tmp, tmp, _PAGE_HUGE);
731 uasm_il_bnez(p, r, tmp, lid);
735 static void build_huge_update_entries(u32 **p, unsigned int pte,
741 * A huge PTE describes an area the size of the
742 * configured huge page size. This is twice the
743 * of the large TLB entry size we intend to use.
744 * A TLB entry half the size of the configured
745 * huge page size is configured into entrylo0
746 * and entrylo1 to cover the contiguous huge PTE
749 small_sequence = (HPAGE_SIZE >> 7) < 0x10000;
751 /* We can clobber tmp. It isn't used after this.*/
753 uasm_i_lui(p, tmp, HPAGE_SIZE >> (7 + 16));
755 build_convert_pte_to_entrylo(p, pte);
756 UASM_i_MTC0(p, pte, C0_ENTRYLO0); /* load it */
757 /* convert to entrylo1 */
759 UASM_i_ADDIU(p, pte, pte, HPAGE_SIZE >> 7);
761 UASM_i_ADDU(p, pte, pte, tmp);
763 UASM_i_MTC0(p, pte, C0_ENTRYLO1); /* load it */
766 static void build_huge_handler_tail(u32 **p, struct uasm_reloc **r,
767 struct uasm_label **l,
772 UASM_i_SC(p, pte, 0, ptr);
773 uasm_il_beqz(p, r, pte, label_tlb_huge_update);
774 UASM_i_LW(p, pte, 0, ptr); /* Needed because SC killed our PTE */
776 UASM_i_SW(p, pte, 0, ptr);
778 build_huge_update_entries(p, pte, ptr);
779 build_huge_tlb_write_entry(p, l, r, pte, tlb_indexed, 0);
781 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
785 * TMP and PTR are scratch.
786 * TMP will be clobbered, PTR will hold the pmd entry.
789 build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
790 unsigned int tmp, unsigned int ptr)
792 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
793 long pgdc = (long)pgd_current;
796 * The vmalloc handling is not in the hotpath.
798 uasm_i_dmfc0(p, tmp, C0_BADVADDR);
800 if (check_for_high_segbits) {
802 * The kernel currently implicitely assumes that the
803 * MIPS SEGBITS parameter for the processor is
804 * (PGDIR_SHIFT+PGDIR_BITS) or less, and will never
805 * allocate virtual addresses outside the maximum
806 * range for SEGBITS = (PGDIR_SHIFT+PGDIR_BITS). But
807 * that doesn't prevent user code from accessing the
808 * higher xuseg addresses. Here, we make sure that
809 * everything but the lower xuseg addresses goes down
810 * the module_alloc/vmalloc path.
812 uasm_i_dsrl_safe(p, ptr, tmp, PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3);
813 uasm_il_bnez(p, r, ptr, label_vmalloc);
815 uasm_il_bltz(p, r, tmp, label_vmalloc);
817 /* No uasm_i_nop needed here, since the next insn doesn't touch TMP. */
819 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
821 /* pgd is in pgd_reg */
822 UASM_i_MFC0(p, ptr, c0_kscratch(), pgd_reg);
825 * &pgd << 11 stored in CONTEXT [23..63].
827 UASM_i_MFC0(p, ptr, C0_CONTEXT);
829 /* Clear lower 23 bits of context. */
830 uasm_i_dins(p, ptr, 0, 0, 23);
832 /* 1 0 1 0 1 << 6 xkphys cached */
833 uasm_i_ori(p, ptr, ptr, 0x540);
834 uasm_i_drotr(p, ptr, ptr, 11);
836 #elif defined(CONFIG_SMP)
837 # ifdef CONFIG_MIPS_MT_SMTC
839 * SMTC uses TCBind value as "CPU" index
841 uasm_i_mfc0(p, ptr, C0_TCBIND);
842 uasm_i_dsrl_safe(p, ptr, ptr, 19);
845 * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
848 uasm_i_dmfc0(p, ptr, C0_CONTEXT);
849 uasm_i_dsrl_safe(p, ptr, ptr, 23);
851 UASM_i_LA_mostly(p, tmp, pgdc);
852 uasm_i_daddu(p, ptr, ptr, tmp);
853 uasm_i_dmfc0(p, tmp, C0_BADVADDR);
854 uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr);
856 UASM_i_LA_mostly(p, ptr, pgdc);
857 uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr);
860 uasm_l_vmalloc_done(l, *p);
862 /* get pgd offset in bytes */
863 uasm_i_dsrl_safe(p, tmp, tmp, PGDIR_SHIFT - 3);
865 uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3);
866 uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */
867 #ifndef __PAGETABLE_PMD_FOLDED
868 uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */
869 uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */
870 uasm_i_dsrl_safe(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */
871 uasm_i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3);
872 uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */
877 * BVADDR is the faulting address, PTR is scratch.
878 * PTR will hold the pgd for vmalloc.
881 build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
882 unsigned int bvaddr, unsigned int ptr,
883 enum vmalloc64_mode mode)
885 long swpd = (long)swapper_pg_dir;
886 int single_insn_swpd;
887 int did_vmalloc_branch = 0;
889 single_insn_swpd = uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd);
891 uasm_l_vmalloc(l, *p);
893 if (mode != not_refill && check_for_high_segbits) {
894 if (single_insn_swpd) {
895 uasm_il_bltz(p, r, bvaddr, label_vmalloc_done);
896 uasm_i_lui(p, ptr, uasm_rel_hi(swpd));
897 did_vmalloc_branch = 1;
900 uasm_il_bgez(p, r, bvaddr, label_large_segbits_fault);
903 if (!did_vmalloc_branch) {
904 if (uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd)) {
905 uasm_il_b(p, r, label_vmalloc_done);
906 uasm_i_lui(p, ptr, uasm_rel_hi(swpd));
908 UASM_i_LA_mostly(p, ptr, swpd);
909 uasm_il_b(p, r, label_vmalloc_done);
910 if (uasm_in_compat_space_p(swpd))
911 uasm_i_addiu(p, ptr, ptr, uasm_rel_lo(swpd));
913 uasm_i_daddiu(p, ptr, ptr, uasm_rel_lo(swpd));
916 if (mode != not_refill && check_for_high_segbits) {
917 uasm_l_large_segbits_fault(l, *p);
919 * We get here if we are an xsseg address, or if we are
920 * an xuseg address above (PGDIR_SHIFT+PGDIR_BITS) boundary.
922 * Ignoring xsseg (assume disabled so would generate
923 * (address errors?), the only remaining possibility
924 * is the upper xuseg addresses. On processors with
925 * TLB_SEGBITS <= PGDIR_SHIFT+PGDIR_BITS, these
926 * addresses would have taken an address error. We try
927 * to mimic that here by taking a load/istream page
930 UASM_i_LA(p, ptr, (unsigned long)tlb_do_page_fault_0);
933 if (mode == refill_scratch) {
934 if (scratch_reg >= 0)
935 UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg);
937 UASM_i_LW(p, 1, scratchpad_offset(0), 0);
944 #else /* !CONFIG_64BIT */
947 * TMP and PTR are scratch.
948 * TMP will be clobbered, PTR will hold the pgd entry.
950 static void __maybe_unused
951 build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
953 long pgdc = (long)pgd_current;
955 /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */
957 #ifdef CONFIG_MIPS_MT_SMTC
959 * SMTC uses TCBind value as "CPU" index
961 uasm_i_mfc0(p, ptr, C0_TCBIND);
962 UASM_i_LA_mostly(p, tmp, pgdc);
963 uasm_i_srl(p, ptr, ptr, 19);
966 * smp_processor_id() << 2 is stored in CONTEXT.
968 uasm_i_mfc0(p, ptr, C0_CONTEXT);
969 UASM_i_LA_mostly(p, tmp, pgdc);
970 uasm_i_srl(p, ptr, ptr, 23);
972 uasm_i_addu(p, ptr, tmp, ptr);
974 UASM_i_LA_mostly(p, ptr, pgdc);
976 uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
977 uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
978 uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */
979 uasm_i_sll(p, tmp, tmp, PGD_T_LOG2);
980 uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */
983 #endif /* !CONFIG_64BIT */
985 static void build_adjust_context(u32 **p, unsigned int ctx)
987 unsigned int shift = 4 - (PTE_T_LOG2 + 1) + PAGE_SHIFT - 12;
988 unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1);
990 switch (current_cpu_type()) {
1007 UASM_i_SRL(p, ctx, ctx, shift);
1008 uasm_i_andi(p, ctx, ctx, mask);
1011 static void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
1014 * Bug workaround for the Nevada. It seems as if under certain
1015 * circumstances the move from cp0_context might produce a
1016 * bogus result when the mfc0 instruction and its consumer are
1017 * in a different cacheline or a load instruction, probably any
1018 * memory reference, is between them.
1020 switch (current_cpu_type()) {
1022 UASM_i_LW(p, ptr, 0, ptr);
1023 GET_CONTEXT(p, tmp); /* get context reg */
1027 GET_CONTEXT(p, tmp); /* get context reg */
1028 UASM_i_LW(p, ptr, 0, ptr);
1032 build_adjust_context(p, tmp);
1033 UASM_i_ADDU(p, ptr, ptr, tmp); /* add in offset */
1036 static void build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep)
1039 * 64bit address support (36bit on a 32bit CPU) in a 32bit
1040 * Kernel is a special case. Only a few CPUs use it.
1042 #ifdef CONFIG_64BIT_PHYS_ADDR
1043 if (cpu_has_64bits) {
1044 uasm_i_ld(p, tmp, 0, ptep); /* get even pte */
1045 uasm_i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
1047 UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL));
1048 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1049 UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL));
1051 uasm_i_dsrl_safe(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
1052 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1053 uasm_i_dsrl_safe(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
1055 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
1057 int pte_off_even = sizeof(pte_t) / 2;
1058 int pte_off_odd = pte_off_even + sizeof(pte_t);
1060 /* The pte entries are pre-shifted */
1061 uasm_i_lw(p, tmp, pte_off_even, ptep); /* get even pte */
1062 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1063 uasm_i_lw(p, ptep, pte_off_odd, ptep); /* get odd pte */
1064 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
1067 UASM_i_LW(p, tmp, 0, ptep); /* get even pte */
1068 UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
1069 if (r45k_bvahwbug())
1070 build_tlb_probe_entry(p);
1072 UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL));
1073 if (r4k_250MHZhwbug())
1074 UASM_i_MTC0(p, 0, C0_ENTRYLO0);
1075 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1076 UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL));
1078 UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
1079 if (r4k_250MHZhwbug())
1080 UASM_i_MTC0(p, 0, C0_ENTRYLO0);
1081 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1082 UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
1083 if (r45k_bvahwbug())
1084 uasm_i_mfc0(p, tmp, C0_INDEX);
1086 if (r4k_250MHZhwbug())
1087 UASM_i_MTC0(p, 0, C0_ENTRYLO1);
1088 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
1092 struct mips_huge_tlb_info {
1094 int restore_scratch;
1097 static struct mips_huge_tlb_info
1098 build_fast_tlb_refill_handler (u32 **p, struct uasm_label **l,
1099 struct uasm_reloc **r, unsigned int tmp,
1100 unsigned int ptr, int c0_scratch_reg)
1102 struct mips_huge_tlb_info rv;
1103 unsigned int even, odd;
1104 int vmalloc_branch_delay_filled = 0;
1105 const int scratch = 1; /* Our extra working register */
1107 rv.huge_pte = scratch;
1108 rv.restore_scratch = 0;
1110 if (check_for_high_segbits) {
1111 UASM_i_MFC0(p, tmp, C0_BADVADDR);
1114 UASM_i_MFC0(p, ptr, c0_kscratch(), pgd_reg);
1116 UASM_i_MFC0(p, ptr, C0_CONTEXT);
1118 if (c0_scratch_reg >= 0)
1119 UASM_i_MTC0(p, scratch, c0_kscratch(), c0_scratch_reg);
1121 UASM_i_SW(p, scratch, scratchpad_offset(0), 0);
1123 uasm_i_dsrl_safe(p, scratch, tmp,
1124 PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3);
1125 uasm_il_bnez(p, r, scratch, label_vmalloc);
1127 if (pgd_reg == -1) {
1128 vmalloc_branch_delay_filled = 1;
1129 /* Clear lower 23 bits of context. */
1130 uasm_i_dins(p, ptr, 0, 0, 23);
1134 UASM_i_MFC0(p, ptr, c0_kscratch(), pgd_reg);
1136 UASM_i_MFC0(p, ptr, C0_CONTEXT);
1138 UASM_i_MFC0(p, tmp, C0_BADVADDR);
1140 if (c0_scratch_reg >= 0)
1141 UASM_i_MTC0(p, scratch, c0_kscratch(), c0_scratch_reg);
1143 UASM_i_SW(p, scratch, scratchpad_offset(0), 0);
1146 /* Clear lower 23 bits of context. */
1147 uasm_i_dins(p, ptr, 0, 0, 23);
1149 uasm_il_bltz(p, r, tmp, label_vmalloc);
1152 if (pgd_reg == -1) {
1153 vmalloc_branch_delay_filled = 1;
1154 /* 1 0 1 0 1 << 6 xkphys cached */
1155 uasm_i_ori(p, ptr, ptr, 0x540);
1156 uasm_i_drotr(p, ptr, ptr, 11);
1159 #ifdef __PAGETABLE_PMD_FOLDED
1160 #define LOC_PTEP scratch
1162 #define LOC_PTEP ptr
1165 if (!vmalloc_branch_delay_filled)
1166 /* get pgd offset in bytes */
1167 uasm_i_dsrl_safe(p, scratch, tmp, PGDIR_SHIFT - 3);
1169 uasm_l_vmalloc_done(l, *p);
1173 * fall-through case = badvaddr *pgd_current
1174 * vmalloc case = badvaddr swapper_pg_dir
1177 if (vmalloc_branch_delay_filled)
1178 /* get pgd offset in bytes */
1179 uasm_i_dsrl_safe(p, scratch, tmp, PGDIR_SHIFT - 3);
1181 #ifdef __PAGETABLE_PMD_FOLDED
1182 GET_CONTEXT(p, tmp); /* get context reg */
1184 uasm_i_andi(p, scratch, scratch, (PTRS_PER_PGD - 1) << 3);
1186 if (use_lwx_insns()) {
1187 UASM_i_LWX(p, LOC_PTEP, scratch, ptr);
1189 uasm_i_daddu(p, ptr, ptr, scratch); /* add in pgd offset */
1190 uasm_i_ld(p, LOC_PTEP, 0, ptr); /* get pmd pointer */
1193 #ifndef __PAGETABLE_PMD_FOLDED
1194 /* get pmd offset in bytes */
1195 uasm_i_dsrl_safe(p, scratch, tmp, PMD_SHIFT - 3);
1196 uasm_i_andi(p, scratch, scratch, (PTRS_PER_PMD - 1) << 3);
1197 GET_CONTEXT(p, tmp); /* get context reg */
1199 if (use_lwx_insns()) {
1200 UASM_i_LWX(p, scratch, scratch, ptr);
1202 uasm_i_daddu(p, ptr, ptr, scratch); /* add in pmd offset */
1203 UASM_i_LW(p, scratch, 0, ptr);
1206 /* Adjust the context during the load latency. */
1207 build_adjust_context(p, tmp);
1209 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1210 uasm_il_bbit1(p, r, scratch, ilog2(_PAGE_HUGE), label_tlb_huge_update);
1212 * The in the LWX case we don't want to do the load in the
1213 * delay slot. It cannot issue in the same cycle and may be
1214 * speculative and unneeded.
1216 if (use_lwx_insns())
1218 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
1221 /* build_update_entries */
1222 if (use_lwx_insns()) {
1225 UASM_i_LWX(p, even, scratch, tmp);
1226 UASM_i_ADDIU(p, tmp, tmp, sizeof(pte_t));
1227 UASM_i_LWX(p, odd, scratch, tmp);
1229 UASM_i_ADDU(p, ptr, scratch, tmp); /* add in offset */
1232 UASM_i_LW(p, even, 0, ptr); /* get even pte */
1233 UASM_i_LW(p, odd, sizeof(pte_t), ptr); /* get odd pte */
1236 uasm_i_drotr(p, even, even, ilog2(_PAGE_GLOBAL));
1237 UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */
1238 uasm_i_drotr(p, odd, odd, ilog2(_PAGE_GLOBAL));
1240 uasm_i_dsrl_safe(p, even, even, ilog2(_PAGE_GLOBAL));
1241 UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */
1242 uasm_i_dsrl_safe(p, odd, odd, ilog2(_PAGE_GLOBAL));
1244 UASM_i_MTC0(p, odd, C0_ENTRYLO1); /* load it */
1246 if (c0_scratch_reg >= 0) {
1247 UASM_i_MFC0(p, scratch, c0_kscratch(), c0_scratch_reg);
1248 build_tlb_write_entry(p, l, r, tlb_random);
1249 uasm_l_leave(l, *p);
1250 rv.restore_scratch = 1;
1251 } else if (PAGE_SHIFT == 14 || PAGE_SHIFT == 13) {
1252 build_tlb_write_entry(p, l, r, tlb_random);
1253 uasm_l_leave(l, *p);
1254 UASM_i_LW(p, scratch, scratchpad_offset(0), 0);
1256 UASM_i_LW(p, scratch, scratchpad_offset(0), 0);
1257 build_tlb_write_entry(p, l, r, tlb_random);
1258 uasm_l_leave(l, *p);
1259 rv.restore_scratch = 1;
1262 uasm_i_eret(p); /* return from trap */
1268 * For a 64-bit kernel, we are using the 64-bit XTLB refill exception
1269 * because EXL == 0. If we wrap, we can also use the 32 instruction
1270 * slots before the XTLB refill exception handler which belong to the
1271 * unused TLB refill exception.
1273 #define MIPS64_REFILL_INSNS 32
1275 static void build_r4000_tlb_refill_handler(void)
1277 u32 *p = tlb_handler;
1278 struct uasm_label *l = labels;
1279 struct uasm_reloc *r = relocs;
1281 unsigned int final_len;
1282 struct mips_huge_tlb_info htlb_info __maybe_unused;
1283 enum vmalloc64_mode vmalloc_mode __maybe_unused;
1285 memset(tlb_handler, 0, sizeof(tlb_handler));
1286 memset(labels, 0, sizeof(labels));
1287 memset(relocs, 0, sizeof(relocs));
1288 memset(final_handler, 0, sizeof(final_handler));
1290 if ((scratch_reg >= 0 || scratchpad_available()) && use_bbit_insns()) {
1291 htlb_info = build_fast_tlb_refill_handler(&p, &l, &r, K0, K1,
1293 vmalloc_mode = refill_scratch;
1295 htlb_info.huge_pte = K0;
1296 htlb_info.restore_scratch = 0;
1297 vmalloc_mode = refill_noscratch;
1299 * create the plain linear handler
1301 if (bcm1250_m3_war()) {
1302 unsigned int segbits = 44;
1304 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
1305 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
1306 uasm_i_xor(&p, K0, K0, K1);
1307 uasm_i_dsrl_safe(&p, K1, K0, 62);
1308 uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
1309 uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
1310 uasm_i_or(&p, K0, K0, K1);
1311 uasm_il_bnez(&p, &r, K0, label_leave);
1312 /* No need for uasm_i_nop */
1316 build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
1318 build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
1321 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1322 build_is_huge_pte(&p, &r, K0, K1, label_tlb_huge_update);
1325 build_get_ptep(&p, K0, K1);
1326 build_update_entries(&p, K0, K1);
1327 build_tlb_write_entry(&p, &l, &r, tlb_random);
1328 uasm_l_leave(&l, p);
1329 uasm_i_eret(&p); /* return from trap */
1331 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1332 uasm_l_tlb_huge_update(&l, p);
1333 build_huge_update_entries(&p, htlb_info.huge_pte, K1);
1334 build_huge_tlb_write_entry(&p, &l, &r, K0, tlb_random,
1335 htlb_info.restore_scratch);
1339 build_get_pgd_vmalloc64(&p, &l, &r, K0, K1, vmalloc_mode);
1343 * Overflow check: For the 64bit handler, we need at least one
1344 * free instruction slot for the wrap-around branch. In worst
1345 * case, if the intended insertion point is a delay slot, we
1346 * need three, with the second nop'ed and the third being
1349 /* Loongson2 ebase is different than r4k, we have more space */
1350 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
1351 if ((p - tlb_handler) > 64)
1352 panic("TLB refill handler space exceeded");
1354 if (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 1)
1355 || (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 3)
1356 && uasm_insn_has_bdelay(relocs,
1357 tlb_handler + MIPS64_REFILL_INSNS - 3)))
1358 panic("TLB refill handler space exceeded");
1362 * Now fold the handler in the TLB refill handler space.
1364 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
1366 /* Simplest case, just copy the handler. */
1367 uasm_copy_handler(relocs, labels, tlb_handler, p, f);
1368 final_len = p - tlb_handler;
1369 #else /* CONFIG_64BIT */
1370 f = final_handler + MIPS64_REFILL_INSNS;
1371 if ((p - tlb_handler) <= MIPS64_REFILL_INSNS) {
1372 /* Just copy the handler. */
1373 uasm_copy_handler(relocs, labels, tlb_handler, p, f);
1374 final_len = p - tlb_handler;
1376 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1377 const enum label_id ls = label_tlb_huge_update;
1379 const enum label_id ls = label_vmalloc;
1385 for (i = 0; i < ARRAY_SIZE(labels) && labels[i].lab != ls; i++)
1387 BUG_ON(i == ARRAY_SIZE(labels));
1388 split = labels[i].addr;
1391 * See if we have overflown one way or the other.
1393 if (split > tlb_handler + MIPS64_REFILL_INSNS ||
1394 split < p - MIPS64_REFILL_INSNS)
1399 * Split two instructions before the end. One
1400 * for the branch and one for the instruction
1401 * in the delay slot.
1403 split = tlb_handler + MIPS64_REFILL_INSNS - 2;
1406 * If the branch would fall in a delay slot,
1407 * we must back up an additional instruction
1408 * so that it is no longer in a delay slot.
1410 if (uasm_insn_has_bdelay(relocs, split - 1))
1413 /* Copy first part of the handler. */
1414 uasm_copy_handler(relocs, labels, tlb_handler, split, f);
1415 f += split - tlb_handler;
1418 /* Insert branch. */
1419 uasm_l_split(&l, final_handler);
1420 uasm_il_b(&f, &r, label_split);
1421 if (uasm_insn_has_bdelay(relocs, split))
1424 uasm_copy_handler(relocs, labels,
1425 split, split + 1, f);
1426 uasm_move_labels(labels, f, f + 1, -1);
1432 /* Copy the rest of the handler. */
1433 uasm_copy_handler(relocs, labels, split, p, final_handler);
1434 final_len = (f - (final_handler + MIPS64_REFILL_INSNS)) +
1437 #endif /* CONFIG_64BIT */
1439 uasm_resolve_relocs(relocs, labels);
1440 pr_debug("Wrote TLB refill handler (%u instructions).\n",
1443 memcpy((void *)ebase, final_handler, 0x100);
1445 dump_handler("r4000_tlb_refill", (u32 *)ebase, 64);
1448 extern u32 handle_tlbl[], handle_tlbl_end[];
1449 extern u32 handle_tlbs[], handle_tlbs_end[];
1450 extern u32 handle_tlbm[], handle_tlbm_end[];
1452 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
1453 extern u32 tlbmiss_handler_setup_pgd[], tlbmiss_handler_setup_pgd_end[];
1455 static void build_r4000_setup_pgd(void)
1459 u32 *p = tlbmiss_handler_setup_pgd_array;
1460 const int tlbmiss_handler_setup_pgd_size =
1461 tlbmiss_handler_setup_pgd_end - tlbmiss_handler_setup_pgd;
1462 struct uasm_label *l = labels;
1463 struct uasm_reloc *r = relocs;
1465 memset(tlbmiss_handler_setup_pgd, 0, tlbmiss_handler_setup_pgd_size *
1466 sizeof(tlbmiss_handler_setup_pgd[0]));
1467 memset(labels, 0, sizeof(labels));
1468 memset(relocs, 0, sizeof(relocs));
1470 pgd_reg = allocate_kscratch();
1472 if (pgd_reg == -1) {
1473 /* PGD << 11 in c0_Context */
1475 * If it is a ckseg0 address, convert to a physical
1476 * address. Shifting right by 29 and adding 4 will
1477 * result in zero for these addresses.
1480 UASM_i_SRA(&p, a1, a0, 29);
1481 UASM_i_ADDIU(&p, a1, a1, 4);
1482 uasm_il_bnez(&p, &r, a1, label_tlbl_goaround1);
1484 uasm_i_dinsm(&p, a0, 0, 29, 64 - 29);
1485 uasm_l_tlbl_goaround1(&l, p);
1486 UASM_i_SLL(&p, a0, a0, 11);
1488 UASM_i_MTC0(&p, a0, C0_CONTEXT);
1490 /* PGD in c0_KScratch */
1492 UASM_i_MTC0(&p, a0, c0_kscratch(), pgd_reg);
1494 if (p >= tlbmiss_handler_setup_pgd_end)
1495 panic("tlbmiss_handler_setup_pgd space exceeded");
1497 uasm_resolve_relocs(relocs, labels);
1498 pr_debug("Wrote tlbmiss_handler_setup_pgd (%u instructions).\n",
1499 (unsigned int)(p - tlbmiss_handler_setup_pgd));
1501 dump_handler("tlbmiss_handler", tlbmiss_handler_setup_pgd,
1502 tlbmiss_handler_setup_pgd_size);
1507 iPTE_LW(u32 **p, unsigned int pte, unsigned int ptr)
1510 # ifdef CONFIG_64BIT_PHYS_ADDR
1512 uasm_i_lld(p, pte, 0, ptr);
1515 UASM_i_LL(p, pte, 0, ptr);
1517 # ifdef CONFIG_64BIT_PHYS_ADDR
1519 uasm_i_ld(p, pte, 0, ptr);
1522 UASM_i_LW(p, pte, 0, ptr);
1527 iPTE_SW(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr,
1530 #ifdef CONFIG_64BIT_PHYS_ADDR
1531 unsigned int hwmode = mode & (_PAGE_VALID | _PAGE_DIRTY);
1534 uasm_i_ori(p, pte, pte, mode);
1536 # ifdef CONFIG_64BIT_PHYS_ADDR
1538 uasm_i_scd(p, pte, 0, ptr);
1541 UASM_i_SC(p, pte, 0, ptr);
1543 if (r10000_llsc_war())
1544 uasm_il_beqzl(p, r, pte, label_smp_pgtable_change);
1546 uasm_il_beqz(p, r, pte, label_smp_pgtable_change);
1548 # ifdef CONFIG_64BIT_PHYS_ADDR
1549 if (!cpu_has_64bits) {
1550 /* no uasm_i_nop needed */
1551 uasm_i_ll(p, pte, sizeof(pte_t) / 2, ptr);
1552 uasm_i_ori(p, pte, pte, hwmode);
1553 uasm_i_sc(p, pte, sizeof(pte_t) / 2, ptr);
1554 uasm_il_beqz(p, r, pte, label_smp_pgtable_change);
1555 /* no uasm_i_nop needed */
1556 uasm_i_lw(p, pte, 0, ptr);
1563 # ifdef CONFIG_64BIT_PHYS_ADDR
1565 uasm_i_sd(p, pte, 0, ptr);
1568 UASM_i_SW(p, pte, 0, ptr);
1570 # ifdef CONFIG_64BIT_PHYS_ADDR
1571 if (!cpu_has_64bits) {
1572 uasm_i_lw(p, pte, sizeof(pte_t) / 2, ptr);
1573 uasm_i_ori(p, pte, pte, hwmode);
1574 uasm_i_sw(p, pte, sizeof(pte_t) / 2, ptr);
1575 uasm_i_lw(p, pte, 0, ptr);
1582 * Check if PTE is present, if not then jump to LABEL. PTR points to
1583 * the page table where this PTE is located, PTE will be re-loaded
1584 * with it's original value.
1587 build_pte_present(u32 **p, struct uasm_reloc **r,
1588 int pte, int ptr, int scratch, enum label_id lid)
1590 int t = scratch >= 0 ? scratch : pte;
1593 if (use_bbit_insns()) {
1594 uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid);
1597 uasm_i_andi(p, t, pte, _PAGE_PRESENT);
1598 uasm_il_beqz(p, r, t, lid);
1600 /* You lose the SMP race :-(*/
1601 iPTE_LW(p, pte, ptr);
1604 uasm_i_andi(p, t, pte, _PAGE_PRESENT | _PAGE_READ);
1605 uasm_i_xori(p, t, t, _PAGE_PRESENT | _PAGE_READ);
1606 uasm_il_bnez(p, r, t, lid);
1608 /* You lose the SMP race :-(*/
1609 iPTE_LW(p, pte, ptr);
1613 /* Make PTE valid, store result in PTR. */
1615 build_make_valid(u32 **p, struct uasm_reloc **r, unsigned int pte,
1618 unsigned int mode = _PAGE_VALID | _PAGE_ACCESSED;
1620 iPTE_SW(p, r, pte, ptr, mode);
1624 * Check if PTE can be written to, if not branch to LABEL. Regardless
1625 * restore PTE with value from PTR when done.
1628 build_pte_writable(u32 **p, struct uasm_reloc **r,
1629 unsigned int pte, unsigned int ptr, int scratch,
1632 int t = scratch >= 0 ? scratch : pte;
1634 uasm_i_andi(p, t, pte, _PAGE_PRESENT | _PAGE_WRITE);
1635 uasm_i_xori(p, t, t, _PAGE_PRESENT | _PAGE_WRITE);
1636 uasm_il_bnez(p, r, t, lid);
1638 /* You lose the SMP race :-(*/
1639 iPTE_LW(p, pte, ptr);
1644 /* Make PTE writable, update software status bits as well, then store
1648 build_make_write(u32 **p, struct uasm_reloc **r, unsigned int pte,
1651 unsigned int mode = (_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID
1654 iPTE_SW(p, r, pte, ptr, mode);
1658 * Check if PTE can be modified, if not branch to LABEL. Regardless
1659 * restore PTE with value from PTR when done.
1662 build_pte_modifiable(u32 **p, struct uasm_reloc **r,
1663 unsigned int pte, unsigned int ptr, int scratch,
1666 if (use_bbit_insns()) {
1667 uasm_il_bbit0(p, r, pte, ilog2(_PAGE_WRITE), lid);
1670 int t = scratch >= 0 ? scratch : pte;
1671 uasm_i_andi(p, t, pte, _PAGE_WRITE);
1672 uasm_il_beqz(p, r, t, lid);
1674 /* You lose the SMP race :-(*/
1675 iPTE_LW(p, pte, ptr);
1679 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
1683 * R3000 style TLB load/store/modify handlers.
1687 * This places the pte into ENTRYLO0 and writes it with tlbwi.
1691 build_r3000_pte_reload_tlbwi(u32 **p, unsigned int pte, unsigned int tmp)
1693 uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1694 uasm_i_mfc0(p, tmp, C0_EPC); /* cp0 delay */
1697 uasm_i_rfe(p); /* branch delay */
1701 * This places the pte into ENTRYLO0 and writes it with tlbwi
1702 * or tlbwr as appropriate. This is because the index register
1703 * may have the probe fail bit set as a result of a trap on a
1704 * kseg2 access, i.e. without refill. Then it returns.
1707 build_r3000_tlb_reload_write(u32 **p, struct uasm_label **l,
1708 struct uasm_reloc **r, unsigned int pte,
1711 uasm_i_mfc0(p, tmp, C0_INDEX);
1712 uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1713 uasm_il_bltz(p, r, tmp, label_r3000_write_probe_fail); /* cp0 delay */
1714 uasm_i_mfc0(p, tmp, C0_EPC); /* branch delay */
1715 uasm_i_tlbwi(p); /* cp0 delay */
1717 uasm_i_rfe(p); /* branch delay */
1718 uasm_l_r3000_write_probe_fail(l, *p);
1719 uasm_i_tlbwr(p); /* cp0 delay */
1721 uasm_i_rfe(p); /* branch delay */
1725 build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte,
1728 long pgdc = (long)pgd_current;
1730 uasm_i_mfc0(p, pte, C0_BADVADDR);
1731 uasm_i_lui(p, ptr, uasm_rel_hi(pgdc)); /* cp0 delay */
1732 uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
1733 uasm_i_srl(p, pte, pte, 22); /* load delay */
1734 uasm_i_sll(p, pte, pte, 2);
1735 uasm_i_addu(p, ptr, ptr, pte);
1736 uasm_i_mfc0(p, pte, C0_CONTEXT);
1737 uasm_i_lw(p, ptr, 0, ptr); /* cp0 delay */
1738 uasm_i_andi(p, pte, pte, 0xffc); /* load delay */
1739 uasm_i_addu(p, ptr, ptr, pte);
1740 uasm_i_lw(p, pte, 0, ptr);
1741 uasm_i_tlbp(p); /* load delay */
1744 static void build_r3000_tlb_load_handler(void)
1746 u32 *p = handle_tlbl;
1747 const int handle_tlbl_size = handle_tlbl_end - handle_tlbl;
1748 struct uasm_label *l = labels;
1749 struct uasm_reloc *r = relocs;
1751 memset(handle_tlbl, 0, handle_tlbl_size * sizeof(handle_tlbl[0]));
1752 memset(labels, 0, sizeof(labels));
1753 memset(relocs, 0, sizeof(relocs));
1755 build_r3000_tlbchange_handler_head(&p, K0, K1);
1756 build_pte_present(&p, &r, K0, K1, -1, label_nopage_tlbl);
1757 uasm_i_nop(&p); /* load delay */
1758 build_make_valid(&p, &r, K0, K1);
1759 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
1761 uasm_l_nopage_tlbl(&l, p);
1762 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
1765 if (p >= handle_tlbl_end)
1766 panic("TLB load handler fastpath space exceeded");
1768 uasm_resolve_relocs(relocs, labels);
1769 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
1770 (unsigned int)(p - handle_tlbl));
1772 dump_handler("r3000_tlb_load", handle_tlbl, handle_tlbl_size);
1775 static void build_r3000_tlb_store_handler(void)
1777 u32 *p = handle_tlbs;
1778 const int handle_tlbs_size = handle_tlbs_end - handle_tlbs;
1779 struct uasm_label *l = labels;
1780 struct uasm_reloc *r = relocs;
1782 memset(handle_tlbs, 0, handle_tlbs_size * sizeof(handle_tlbs[0]));
1783 memset(labels, 0, sizeof(labels));
1784 memset(relocs, 0, sizeof(relocs));
1786 build_r3000_tlbchange_handler_head(&p, K0, K1);
1787 build_pte_writable(&p, &r, K0, K1, -1, label_nopage_tlbs);
1788 uasm_i_nop(&p); /* load delay */
1789 build_make_write(&p, &r, K0, K1);
1790 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
1792 uasm_l_nopage_tlbs(&l, p);
1793 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1796 if (p >= handle_tlbs)
1797 panic("TLB store handler fastpath space exceeded");
1799 uasm_resolve_relocs(relocs, labels);
1800 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
1801 (unsigned int)(p - handle_tlbs));
1803 dump_handler("r3000_tlb_store", handle_tlbs, handle_tlbs_size);
1806 static void build_r3000_tlb_modify_handler(void)
1808 u32 *p = handle_tlbm;
1809 const int handle_tlbm_size = handle_tlbm_end - handle_tlbm;
1810 struct uasm_label *l = labels;
1811 struct uasm_reloc *r = relocs;
1813 memset(handle_tlbm, 0, handle_tlbm_size * sizeof(handle_tlbm[0]));
1814 memset(labels, 0, sizeof(labels));
1815 memset(relocs, 0, sizeof(relocs));
1817 build_r3000_tlbchange_handler_head(&p, K0, K1);
1818 build_pte_modifiable(&p, &r, K0, K1, -1, label_nopage_tlbm);
1819 uasm_i_nop(&p); /* load delay */
1820 build_make_write(&p, &r, K0, K1);
1821 build_r3000_pte_reload_tlbwi(&p, K0, K1);
1823 uasm_l_nopage_tlbm(&l, p);
1824 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1827 if (p >= handle_tlbm_end)
1828 panic("TLB modify handler fastpath space exceeded");
1830 uasm_resolve_relocs(relocs, labels);
1831 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
1832 (unsigned int)(p - handle_tlbm));
1834 dump_handler("r3000_tlb_modify", handle_tlbm, handle_tlbm_size);
1836 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
1839 * R4000 style TLB load/store/modify handlers.
1841 static struct work_registers
1842 build_r4000_tlbchange_handler_head(u32 **p, struct uasm_label **l,
1843 struct uasm_reloc **r)
1845 struct work_registers wr = build_get_work_registers(p);
1848 build_get_pmde64(p, l, r, wr.r1, wr.r2); /* get pmd in ptr */
1850 build_get_pgde32(p, wr.r1, wr.r2); /* get pgd in ptr */
1853 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1855 * For huge tlb entries, pmd doesn't contain an address but
1856 * instead contains the tlb pte. Check the PAGE_HUGE bit and
1857 * see if we need to jump to huge tlb processing.
1859 build_is_huge_pte(p, r, wr.r1, wr.r2, label_tlb_huge_update);
1862 UASM_i_MFC0(p, wr.r1, C0_BADVADDR);
1863 UASM_i_LW(p, wr.r2, 0, wr.r2);
1864 UASM_i_SRL(p, wr.r1, wr.r1, PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2);
1865 uasm_i_andi(p, wr.r1, wr.r1, (PTRS_PER_PTE - 1) << PTE_T_LOG2);
1866 UASM_i_ADDU(p, wr.r2, wr.r2, wr.r1);
1869 uasm_l_smp_pgtable_change(l, *p);
1871 iPTE_LW(p, wr.r1, wr.r2); /* get even pte */
1872 if (!m4kc_tlbp_war())
1873 build_tlb_probe_entry(p);
1878 build_r4000_tlbchange_handler_tail(u32 **p, struct uasm_label **l,
1879 struct uasm_reloc **r, unsigned int tmp,
1882 uasm_i_ori(p, ptr, ptr, sizeof(pte_t));
1883 uasm_i_xori(p, ptr, ptr, sizeof(pte_t));
1884 build_update_entries(p, tmp, ptr);
1885 build_tlb_write_entry(p, l, r, tlb_indexed);
1886 uasm_l_leave(l, *p);
1887 build_restore_work_registers(p);
1888 uasm_i_eret(p); /* return from trap */
1891 build_get_pgd_vmalloc64(p, l, r, tmp, ptr, not_refill);
1895 static void build_r4000_tlb_load_handler(void)
1897 u32 *p = handle_tlbl;
1898 const int handle_tlbl_size = handle_tlbl_end - handle_tlbl;
1899 struct uasm_label *l = labels;
1900 struct uasm_reloc *r = relocs;
1901 struct work_registers wr;
1903 memset(handle_tlbl, 0, handle_tlbl_size * sizeof(handle_tlbl[0]));
1904 memset(labels, 0, sizeof(labels));
1905 memset(relocs, 0, sizeof(relocs));
1907 if (bcm1250_m3_war()) {
1908 unsigned int segbits = 44;
1910 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
1911 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
1912 uasm_i_xor(&p, K0, K0, K1);
1913 uasm_i_dsrl_safe(&p, K1, K0, 62);
1914 uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
1915 uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
1916 uasm_i_or(&p, K0, K0, K1);
1917 uasm_il_bnez(&p, &r, K0, label_leave);
1918 /* No need for uasm_i_nop */
1921 wr = build_r4000_tlbchange_handler_head(&p, &l, &r);
1922 build_pte_present(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbl);
1923 if (m4kc_tlbp_war())
1924 build_tlb_probe_entry(&p);
1928 * If the page is not _PAGE_VALID, RI or XI could not
1929 * have triggered it. Skip the expensive test..
1931 if (use_bbit_insns()) {
1932 uasm_il_bbit0(&p, &r, wr.r1, ilog2(_PAGE_VALID),
1933 label_tlbl_goaround1);
1935 uasm_i_andi(&p, wr.r3, wr.r1, _PAGE_VALID);
1936 uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround1);
1942 switch (current_cpu_type()) {
1944 if (cpu_has_mips_r2) {
1947 case CPU_CAVIUM_OCTEON:
1948 case CPU_CAVIUM_OCTEON_PLUS:
1949 case CPU_CAVIUM_OCTEON2:
1954 /* Examine entrylo 0 or 1 based on ptr. */
1955 if (use_bbit_insns()) {
1956 uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8);
1958 uasm_i_andi(&p, wr.r3, wr.r2, sizeof(pte_t));
1959 uasm_i_beqz(&p, wr.r3, 8);
1961 /* load it in the delay slot*/
1962 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO0);
1963 /* load it if ptr is odd */
1964 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO1);
1966 * If the entryLo (now in wr.r3) is valid (bit 1), RI or
1967 * XI must have triggered it.
1969 if (use_bbit_insns()) {
1970 uasm_il_bbit1(&p, &r, wr.r3, 1, label_nopage_tlbl);
1972 uasm_l_tlbl_goaround1(&l, p);
1974 uasm_i_andi(&p, wr.r3, wr.r3, 2);
1975 uasm_il_bnez(&p, &r, wr.r3, label_nopage_tlbl);
1978 uasm_l_tlbl_goaround1(&l, p);
1980 build_make_valid(&p, &r, wr.r1, wr.r2);
1981 build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2);
1983 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1985 * This is the entry point when build_r4000_tlbchange_handler_head
1986 * spots a huge page.
1988 uasm_l_tlb_huge_update(&l, p);
1989 iPTE_LW(&p, wr.r1, wr.r2);
1990 build_pte_present(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbl);
1991 build_tlb_probe_entry(&p);
1995 * If the page is not _PAGE_VALID, RI or XI could not
1996 * have triggered it. Skip the expensive test..
1998 if (use_bbit_insns()) {
1999 uasm_il_bbit0(&p, &r, wr.r1, ilog2(_PAGE_VALID),
2000 label_tlbl_goaround2);
2002 uasm_i_andi(&p, wr.r3, wr.r1, _PAGE_VALID);
2003 uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround2);
2009 switch (current_cpu_type()) {
2011 if (cpu_has_mips_r2) {
2014 case CPU_CAVIUM_OCTEON:
2015 case CPU_CAVIUM_OCTEON_PLUS:
2016 case CPU_CAVIUM_OCTEON2:
2021 /* Examine entrylo 0 or 1 based on ptr. */
2022 if (use_bbit_insns()) {
2023 uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8);
2025 uasm_i_andi(&p, wr.r3, wr.r2, sizeof(pte_t));
2026 uasm_i_beqz(&p, wr.r3, 8);
2028 /* load it in the delay slot*/
2029 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO0);
2030 /* load it if ptr is odd */
2031 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO1);
2033 * If the entryLo (now in wr.r3) is valid (bit 1), RI or
2034 * XI must have triggered it.
2036 if (use_bbit_insns()) {
2037 uasm_il_bbit0(&p, &r, wr.r3, 1, label_tlbl_goaround2);
2039 uasm_i_andi(&p, wr.r3, wr.r3, 2);
2040 uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround2);
2042 if (PM_DEFAULT_MASK == 0)
2045 * We clobbered C0_PAGEMASK, restore it. On the other branch
2046 * it is restored in build_huge_tlb_write_entry.
2048 build_restore_pagemask(&p, &r, wr.r3, label_nopage_tlbl, 0);
2050 uasm_l_tlbl_goaround2(&l, p);
2052 uasm_i_ori(&p, wr.r1, wr.r1, (_PAGE_ACCESSED | _PAGE_VALID));
2053 build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
2056 uasm_l_nopage_tlbl(&l, p);
2057 build_restore_work_registers(&p);
2058 #ifdef CONFIG_CPU_MICROMIPS
2059 if ((unsigned long)tlb_do_page_fault_0 & 1) {
2060 uasm_i_lui(&p, K0, uasm_rel_hi((long)tlb_do_page_fault_0));
2061 uasm_i_addiu(&p, K0, K0, uasm_rel_lo((long)tlb_do_page_fault_0));
2065 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
2068 if (p >= handle_tlbl_end)
2069 panic("TLB load handler fastpath space exceeded");
2071 uasm_resolve_relocs(relocs, labels);
2072 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
2073 (unsigned int)(p - handle_tlbl));
2075 dump_handler("r4000_tlb_load", handle_tlbl, handle_tlbl_size);
2078 static void build_r4000_tlb_store_handler(void)
2080 u32 *p = handle_tlbs;
2081 const int handle_tlbs_size = handle_tlbs_end - handle_tlbs;
2082 struct uasm_label *l = labels;
2083 struct uasm_reloc *r = relocs;
2084 struct work_registers wr;
2086 memset(handle_tlbs, 0, handle_tlbs_size * sizeof(handle_tlbs[0]));
2087 memset(labels, 0, sizeof(labels));
2088 memset(relocs, 0, sizeof(relocs));
2090 wr = build_r4000_tlbchange_handler_head(&p, &l, &r);
2091 build_pte_writable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbs);
2092 if (m4kc_tlbp_war())
2093 build_tlb_probe_entry(&p);
2094 build_make_write(&p, &r, wr.r1, wr.r2);
2095 build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2);
2097 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
2099 * This is the entry point when
2100 * build_r4000_tlbchange_handler_head spots a huge page.
2102 uasm_l_tlb_huge_update(&l, p);
2103 iPTE_LW(&p, wr.r1, wr.r2);
2104 build_pte_writable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbs);
2105 build_tlb_probe_entry(&p);
2106 uasm_i_ori(&p, wr.r1, wr.r1,
2107 _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
2108 build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
2111 uasm_l_nopage_tlbs(&l, p);
2112 build_restore_work_registers(&p);
2113 #ifdef CONFIG_CPU_MICROMIPS
2114 if ((unsigned long)tlb_do_page_fault_1 & 1) {
2115 uasm_i_lui(&p, K0, uasm_rel_hi((long)tlb_do_page_fault_1));
2116 uasm_i_addiu(&p, K0, K0, uasm_rel_lo((long)tlb_do_page_fault_1));
2120 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
2123 if (p >= handle_tlbs_end)
2124 panic("TLB store handler fastpath space exceeded");
2126 uasm_resolve_relocs(relocs, labels);
2127 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
2128 (unsigned int)(p - handle_tlbs));
2130 dump_handler("r4000_tlb_store", handle_tlbs, handle_tlbs_size);
2133 static void build_r4000_tlb_modify_handler(void)
2135 u32 *p = handle_tlbm;
2136 const int handle_tlbm_size = handle_tlbm_end - handle_tlbm;
2137 struct uasm_label *l = labels;
2138 struct uasm_reloc *r = relocs;
2139 struct work_registers wr;
2141 memset(handle_tlbm, 0, handle_tlbm_size * sizeof(handle_tlbm[0]));
2142 memset(labels, 0, sizeof(labels));
2143 memset(relocs, 0, sizeof(relocs));
2145 wr = build_r4000_tlbchange_handler_head(&p, &l, &r);
2146 build_pte_modifiable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbm);
2147 if (m4kc_tlbp_war())
2148 build_tlb_probe_entry(&p);
2149 /* Present and writable bits set, set accessed and dirty bits. */
2150 build_make_write(&p, &r, wr.r1, wr.r2);
2151 build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2);
2153 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
2155 * This is the entry point when
2156 * build_r4000_tlbchange_handler_head spots a huge page.
2158 uasm_l_tlb_huge_update(&l, p);
2159 iPTE_LW(&p, wr.r1, wr.r2);
2160 build_pte_modifiable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbm);
2161 build_tlb_probe_entry(&p);
2162 uasm_i_ori(&p, wr.r1, wr.r1,
2163 _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
2164 build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
2167 uasm_l_nopage_tlbm(&l, p);
2168 build_restore_work_registers(&p);
2169 #ifdef CONFIG_CPU_MICROMIPS
2170 if ((unsigned long)tlb_do_page_fault_1 & 1) {
2171 uasm_i_lui(&p, K0, uasm_rel_hi((long)tlb_do_page_fault_1));
2172 uasm_i_addiu(&p, K0, K0, uasm_rel_lo((long)tlb_do_page_fault_1));
2176 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
2179 if (p >= handle_tlbm_end)
2180 panic("TLB modify handler fastpath space exceeded");
2182 uasm_resolve_relocs(relocs, labels);
2183 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
2184 (unsigned int)(p - handle_tlbm));
2186 dump_handler("r4000_tlb_modify", handle_tlbm, handle_tlbm_size);
2189 static void flush_tlb_handlers(void)
2191 local_flush_icache_range((unsigned long)handle_tlbl,
2192 (unsigned long)handle_tlbl_end);
2193 local_flush_icache_range((unsigned long)handle_tlbs,
2194 (unsigned long)handle_tlbs_end);
2195 local_flush_icache_range((unsigned long)handle_tlbm,
2196 (unsigned long)handle_tlbm_end);
2197 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
2198 local_flush_icache_range((unsigned long)tlbmiss_handler_setup_pgd,
2199 (unsigned long)tlbmiss_handler_setup_pgd_end);
2203 void build_tlb_refill_handler(void)
2206 * The refill handler is generated per-CPU, multi-node systems
2207 * may have local storage for it. The other handlers are only
2210 static int run_once = 0;
2212 output_pgtable_bits_defines();
2215 check_for_high_segbits = current_cpu_data.vmbits > (PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3);
2218 switch (current_cpu_type()) {
2226 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
2227 if (cpu_has_local_ebase)
2228 build_r3000_tlb_refill_handler();
2230 if (!cpu_has_local_ebase)
2231 build_r3000_tlb_refill_handler();
2232 build_r3000_tlb_load_handler();
2233 build_r3000_tlb_store_handler();
2234 build_r3000_tlb_modify_handler();
2235 flush_tlb_handlers();
2239 panic("No R3000 TLB refill handler");
2245 panic("No R6000 TLB refill handler yet");
2249 panic("No R8000 TLB refill handler yet");
2254 scratch_reg = allocate_kscratch();
2255 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
2256 build_r4000_setup_pgd();
2258 build_r4000_tlb_load_handler();
2259 build_r4000_tlb_store_handler();
2260 build_r4000_tlb_modify_handler();
2261 if (!cpu_has_local_ebase)
2262 build_r4000_tlb_refill_handler();
2263 flush_tlb_handlers();
2266 if (cpu_has_local_ebase)
2267 build_r4000_tlb_refill_handler();