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 __cpuinit 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 __cpuinitdata 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] __cpuinitdata;
296 /* simply assume worst case size for labels and relocs */
297 static struct uasm_label labels[128] __cpuinitdata;
298 static struct uasm_reloc relocs[128] __cpuinitdata;
301 static int check_for_high_segbits __cpuinitdata;
304 static int check_for_high_segbits __cpuinitdata;
306 static unsigned int kscratch_used_mask __cpuinitdata;
308 static int __cpuinit allocate_kscratch(void)
311 unsigned int a = cpu_data[0].kscratch_mask & ~kscratch_used_mask;
318 r--; /* make it zero based */
320 kscratch_used_mask |= (1 << r);
325 static int scratch_reg __cpuinitdata;
326 static int pgd_reg __cpuinitdata;
327 enum vmalloc64_mode {not_refill, refill_scratch, refill_noscratch};
329 static struct work_registers __cpuinit build_get_work_registers(u32 **p)
331 struct work_registers r;
333 int smp_processor_id_reg;
334 int smp_processor_id_sel;
335 int smp_processor_id_shift;
337 if (scratch_reg > 0) {
338 /* Save in CPU local C0_KScratch? */
339 UASM_i_MTC0(p, 1, 31, scratch_reg);
346 if (num_possible_cpus() > 1) {
347 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
348 smp_processor_id_shift = 51;
349 smp_processor_id_reg = 20; /* XContext */
350 smp_processor_id_sel = 0;
353 smp_processor_id_shift = 25;
354 smp_processor_id_reg = 4; /* Context */
355 smp_processor_id_sel = 0;
358 smp_processor_id_shift = 26;
359 smp_processor_id_reg = 4; /* Context */
360 smp_processor_id_sel = 0;
363 /* Get smp_processor_id */
364 UASM_i_MFC0(p, K0, smp_processor_id_reg, smp_processor_id_sel);
365 UASM_i_SRL_SAFE(p, K0, K0, smp_processor_id_shift);
367 /* handler_reg_save index in K0 */
368 UASM_i_SLL(p, K0, K0, ilog2(sizeof(struct tlb_reg_save)));
370 UASM_i_LA(p, K1, (long)&handler_reg_save);
371 UASM_i_ADDU(p, K0, K0, K1);
373 UASM_i_LA(p, K0, (long)&handler_reg_save);
375 /* K0 now points to save area, save $1 and $2 */
376 UASM_i_SW(p, 1, offsetof(struct tlb_reg_save, a), K0);
377 UASM_i_SW(p, 2, offsetof(struct tlb_reg_save, b), K0);
385 static void __cpuinit build_restore_work_registers(u32 **p)
387 if (scratch_reg > 0) {
388 UASM_i_MFC0(p, 1, 31, scratch_reg);
391 /* K0 already points to save area, restore $1 and $2 */
392 UASM_i_LW(p, 1, offsetof(struct tlb_reg_save, a), K0);
393 UASM_i_LW(p, 2, offsetof(struct tlb_reg_save, b), K0);
396 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
399 * CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current,
400 * we cannot do r3000 under these circumstances.
402 * Declare pgd_current here instead of including mmu_context.h to avoid type
403 * conflicts for tlbmiss_handler_setup_pgd
405 extern unsigned long pgd_current[];
408 * The R3000 TLB handler is simple.
410 static void __cpuinit build_r3000_tlb_refill_handler(void)
412 long pgdc = (long)pgd_current;
415 memset(tlb_handler, 0, sizeof(tlb_handler));
418 uasm_i_mfc0(&p, K0, C0_BADVADDR);
419 uasm_i_lui(&p, K1, uasm_rel_hi(pgdc)); /* cp0 delay */
420 uasm_i_lw(&p, K1, uasm_rel_lo(pgdc), K1);
421 uasm_i_srl(&p, K0, K0, 22); /* load delay */
422 uasm_i_sll(&p, K0, K0, 2);
423 uasm_i_addu(&p, K1, K1, K0);
424 uasm_i_mfc0(&p, K0, C0_CONTEXT);
425 uasm_i_lw(&p, K1, 0, K1); /* cp0 delay */
426 uasm_i_andi(&p, K0, K0, 0xffc); /* load delay */
427 uasm_i_addu(&p, K1, K1, K0);
428 uasm_i_lw(&p, K0, 0, K1);
429 uasm_i_nop(&p); /* load delay */
430 uasm_i_mtc0(&p, K0, C0_ENTRYLO0);
431 uasm_i_mfc0(&p, K1, C0_EPC); /* cp0 delay */
432 uasm_i_tlbwr(&p); /* cp0 delay */
434 uasm_i_rfe(&p); /* branch delay */
436 if (p > tlb_handler + 32)
437 panic("TLB refill handler space exceeded");
439 pr_debug("Wrote TLB refill handler (%u instructions).\n",
440 (unsigned int)(p - tlb_handler));
442 memcpy((void *)ebase, tlb_handler, 0x80);
444 dump_handler("r3000_tlb_refill", (u32 *)ebase, 32);
446 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
449 * The R4000 TLB handler is much more complicated. We have two
450 * consecutive handler areas with 32 instructions space each.
451 * Since they aren't used at the same time, we can overflow in the
452 * other one.To keep things simple, we first assume linear space,
453 * then we relocate it to the final handler layout as needed.
455 static u32 final_handler[64] __cpuinitdata;
460 * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0:
461 * 2. A timing hazard exists for the TLBP instruction.
463 * stalling_instruction
466 * The JTLB is being read for the TLBP throughout the stall generated by the
467 * previous instruction. This is not really correct as the stalling instruction
468 * can modify the address used to access the JTLB. The failure symptom is that
469 * the TLBP instruction will use an address created for the stalling instruction
470 * and not the address held in C0_ENHI and thus report the wrong results.
472 * The software work-around is to not allow the instruction preceding the TLBP
473 * to stall - make it an NOP or some other instruction guaranteed not to stall.
475 * Errata 2 will not be fixed. This errata is also on the R5000.
477 * As if we MIPS hackers wouldn't know how to nop pipelines happy ...
479 static void __cpuinit __maybe_unused build_tlb_probe_entry(u32 **p)
481 switch (current_cpu_type()) {
482 /* Found by experiment: R4600 v2.0/R4700 needs this, too. */
498 * Write random or indexed TLB entry, and care about the hazards from
499 * the preceding mtc0 and for the following eret.
501 enum tlb_write_entry { tlb_random, tlb_indexed };
503 static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l,
504 struct uasm_reloc **r,
505 enum tlb_write_entry wmode)
507 void(*tlbw)(u32 **) = NULL;
510 case tlb_random: tlbw = uasm_i_tlbwr; break;
511 case tlb_indexed: tlbw = uasm_i_tlbwi; break;
514 if (cpu_has_mips_r2) {
516 * The architecture spec says an ehb is required here,
517 * but a number of cores do not have the hazard and
518 * using an ehb causes an expensive pipeline stall.
520 switch (current_cpu_type()) {
533 switch (current_cpu_type()) {
541 * This branch uses up a mtc0 hazard nop slot and saves
542 * two nops after the tlbw instruction.
544 uasm_bgezl_hazard(p, r, hazard_instance);
546 uasm_bgezl_label(l, p, hazard_instance);
560 uasm_i_nop(p); /* QED specifies 2 nops hazard */
561 uasm_i_nop(p); /* QED specifies 2 nops hazard */
632 panic("No TLB refill handler yet (CPU type: %d)",
633 current_cpu_data.cputype);
638 static __cpuinit __maybe_unused void build_convert_pte_to_entrylo(u32 **p,
642 UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL));
644 #ifdef CONFIG_64BIT_PHYS_ADDR
645 uasm_i_dsrl_safe(p, reg, reg, ilog2(_PAGE_GLOBAL));
647 UASM_i_SRL(p, reg, reg, ilog2(_PAGE_GLOBAL));
652 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
654 static __cpuinit void build_restore_pagemask(u32 **p,
655 struct uasm_reloc **r,
660 if (restore_scratch) {
661 /* Reset default page size */
662 if (PM_DEFAULT_MASK >> 16) {
663 uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16);
664 uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff);
665 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
666 uasm_il_b(p, r, lid);
667 } else if (PM_DEFAULT_MASK) {
668 uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK);
669 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
670 uasm_il_b(p, r, lid);
672 uasm_i_mtc0(p, 0, C0_PAGEMASK);
673 uasm_il_b(p, r, lid);
676 UASM_i_MFC0(p, 1, 31, scratch_reg);
678 UASM_i_LW(p, 1, scratchpad_offset(0), 0);
680 /* Reset default page size */
681 if (PM_DEFAULT_MASK >> 16) {
682 uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16);
683 uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff);
684 uasm_il_b(p, r, lid);
685 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
686 } else if (PM_DEFAULT_MASK) {
687 uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK);
688 uasm_il_b(p, r, lid);
689 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
691 uasm_il_b(p, r, lid);
692 uasm_i_mtc0(p, 0, C0_PAGEMASK);
697 static __cpuinit void build_huge_tlb_write_entry(u32 **p,
698 struct uasm_label **l,
699 struct uasm_reloc **r,
701 enum tlb_write_entry wmode,
704 /* Set huge page tlb entry size */
705 uasm_i_lui(p, tmp, PM_HUGE_MASK >> 16);
706 uasm_i_ori(p, tmp, tmp, PM_HUGE_MASK & 0xffff);
707 uasm_i_mtc0(p, tmp, C0_PAGEMASK);
709 build_tlb_write_entry(p, l, r, wmode);
711 build_restore_pagemask(p, r, tmp, label_leave, restore_scratch);
715 * Check if Huge PTE is present, if so then jump to LABEL.
717 static void __cpuinit
718 build_is_huge_pte(u32 **p, struct uasm_reloc **r, unsigned int tmp,
719 unsigned int pmd, int lid)
721 UASM_i_LW(p, tmp, 0, pmd);
722 if (use_bbit_insns()) {
723 uasm_il_bbit1(p, r, tmp, ilog2(_PAGE_HUGE), lid);
725 uasm_i_andi(p, tmp, tmp, _PAGE_HUGE);
726 uasm_il_bnez(p, r, tmp, lid);
730 static __cpuinit void build_huge_update_entries(u32 **p,
737 * A huge PTE describes an area the size of the
738 * configured huge page size. This is twice the
739 * of the large TLB entry size we intend to use.
740 * A TLB entry half the size of the configured
741 * huge page size is configured into entrylo0
742 * and entrylo1 to cover the contiguous huge PTE
745 small_sequence = (HPAGE_SIZE >> 7) < 0x10000;
747 /* We can clobber tmp. It isn't used after this.*/
749 uasm_i_lui(p, tmp, HPAGE_SIZE >> (7 + 16));
751 build_convert_pte_to_entrylo(p, pte);
752 UASM_i_MTC0(p, pte, C0_ENTRYLO0); /* load it */
753 /* convert to entrylo1 */
755 UASM_i_ADDIU(p, pte, pte, HPAGE_SIZE >> 7);
757 UASM_i_ADDU(p, pte, pte, tmp);
759 UASM_i_MTC0(p, pte, C0_ENTRYLO1); /* load it */
762 static __cpuinit void build_huge_handler_tail(u32 **p,
763 struct uasm_reloc **r,
764 struct uasm_label **l,
769 UASM_i_SC(p, pte, 0, ptr);
770 uasm_il_beqz(p, r, pte, label_tlb_huge_update);
771 UASM_i_LW(p, pte, 0, ptr); /* Needed because SC killed our PTE */
773 UASM_i_SW(p, pte, 0, ptr);
775 build_huge_update_entries(p, pte, ptr);
776 build_huge_tlb_write_entry(p, l, r, pte, tlb_indexed, 0);
778 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
782 * TMP and PTR are scratch.
783 * TMP will be clobbered, PTR will hold the pmd entry.
785 static void __cpuinit
786 build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
787 unsigned int tmp, unsigned int ptr)
789 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
790 long pgdc = (long)pgd_current;
793 * The vmalloc handling is not in the hotpath.
795 uasm_i_dmfc0(p, tmp, C0_BADVADDR);
797 if (check_for_high_segbits) {
799 * The kernel currently implicitely assumes that the
800 * MIPS SEGBITS parameter for the processor is
801 * (PGDIR_SHIFT+PGDIR_BITS) or less, and will never
802 * allocate virtual addresses outside the maximum
803 * range for SEGBITS = (PGDIR_SHIFT+PGDIR_BITS). But
804 * that doesn't prevent user code from accessing the
805 * higher xuseg addresses. Here, we make sure that
806 * everything but the lower xuseg addresses goes down
807 * the module_alloc/vmalloc path.
809 uasm_i_dsrl_safe(p, ptr, tmp, PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3);
810 uasm_il_bnez(p, r, ptr, label_vmalloc);
812 uasm_il_bltz(p, r, tmp, label_vmalloc);
814 /* No uasm_i_nop needed here, since the next insn doesn't touch TMP. */
816 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
818 /* pgd is in pgd_reg */
819 UASM_i_MFC0(p, ptr, 31, pgd_reg);
822 * &pgd << 11 stored in CONTEXT [23..63].
824 UASM_i_MFC0(p, ptr, C0_CONTEXT);
826 /* Clear lower 23 bits of context. */
827 uasm_i_dins(p, ptr, 0, 0, 23);
829 /* 1 0 1 0 1 << 6 xkphys cached */
830 uasm_i_ori(p, ptr, ptr, 0x540);
831 uasm_i_drotr(p, ptr, ptr, 11);
833 #elif defined(CONFIG_SMP)
834 # ifdef CONFIG_MIPS_MT_SMTC
836 * SMTC uses TCBind value as "CPU" index
838 uasm_i_mfc0(p, ptr, C0_TCBIND);
839 uasm_i_dsrl_safe(p, ptr, ptr, 19);
842 * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
845 uasm_i_dmfc0(p, ptr, C0_CONTEXT);
846 uasm_i_dsrl_safe(p, ptr, ptr, 23);
848 UASM_i_LA_mostly(p, tmp, pgdc);
849 uasm_i_daddu(p, ptr, ptr, tmp);
850 uasm_i_dmfc0(p, tmp, C0_BADVADDR);
851 uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr);
853 UASM_i_LA_mostly(p, ptr, pgdc);
854 uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr);
857 uasm_l_vmalloc_done(l, *p);
859 /* get pgd offset in bytes */
860 uasm_i_dsrl_safe(p, tmp, tmp, PGDIR_SHIFT - 3);
862 uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3);
863 uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */
864 #ifndef __PAGETABLE_PMD_FOLDED
865 uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */
866 uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */
867 uasm_i_dsrl_safe(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */
868 uasm_i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3);
869 uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */
874 * BVADDR is the faulting address, PTR is scratch.
875 * PTR will hold the pgd for vmalloc.
877 static void __cpuinit
878 build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
879 unsigned int bvaddr, unsigned int ptr,
880 enum vmalloc64_mode mode)
882 long swpd = (long)swapper_pg_dir;
883 int single_insn_swpd;
884 int did_vmalloc_branch = 0;
886 single_insn_swpd = uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd);
888 uasm_l_vmalloc(l, *p);
890 if (mode != not_refill && check_for_high_segbits) {
891 if (single_insn_swpd) {
892 uasm_il_bltz(p, r, bvaddr, label_vmalloc_done);
893 uasm_i_lui(p, ptr, uasm_rel_hi(swpd));
894 did_vmalloc_branch = 1;
897 uasm_il_bgez(p, r, bvaddr, label_large_segbits_fault);
900 if (!did_vmalloc_branch) {
901 if (uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd)) {
902 uasm_il_b(p, r, label_vmalloc_done);
903 uasm_i_lui(p, ptr, uasm_rel_hi(swpd));
905 UASM_i_LA_mostly(p, ptr, swpd);
906 uasm_il_b(p, r, label_vmalloc_done);
907 if (uasm_in_compat_space_p(swpd))
908 uasm_i_addiu(p, ptr, ptr, uasm_rel_lo(swpd));
910 uasm_i_daddiu(p, ptr, ptr, uasm_rel_lo(swpd));
913 if (mode != not_refill && check_for_high_segbits) {
914 uasm_l_large_segbits_fault(l, *p);
916 * We get here if we are an xsseg address, or if we are
917 * an xuseg address above (PGDIR_SHIFT+PGDIR_BITS) boundary.
919 * Ignoring xsseg (assume disabled so would generate
920 * (address errors?), the only remaining possibility
921 * is the upper xuseg addresses. On processors with
922 * TLB_SEGBITS <= PGDIR_SHIFT+PGDIR_BITS, these
923 * addresses would have taken an address error. We try
924 * to mimic that here by taking a load/istream page
927 UASM_i_LA(p, ptr, (unsigned long)tlb_do_page_fault_0);
930 if (mode == refill_scratch) {
932 UASM_i_MFC0(p, 1, 31, scratch_reg);
934 UASM_i_LW(p, 1, scratchpad_offset(0), 0);
941 #else /* !CONFIG_64BIT */
944 * TMP and PTR are scratch.
945 * TMP will be clobbered, PTR will hold the pgd entry.
947 static void __cpuinit __maybe_unused
948 build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
950 long pgdc = (long)pgd_current;
952 /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */
954 #ifdef CONFIG_MIPS_MT_SMTC
956 * SMTC uses TCBind value as "CPU" index
958 uasm_i_mfc0(p, ptr, C0_TCBIND);
959 UASM_i_LA_mostly(p, tmp, pgdc);
960 uasm_i_srl(p, ptr, ptr, 19);
963 * smp_processor_id() << 3 is stored in CONTEXT.
965 uasm_i_mfc0(p, ptr, C0_CONTEXT);
966 UASM_i_LA_mostly(p, tmp, pgdc);
967 uasm_i_srl(p, ptr, ptr, 23);
969 uasm_i_addu(p, ptr, tmp, ptr);
971 UASM_i_LA_mostly(p, ptr, pgdc);
973 uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
974 uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
976 if (cpu_has_mips_r2) {
977 uasm_i_ext(p, tmp, tmp, PGDIR_SHIFT, (32 - PGDIR_SHIFT));
978 uasm_i_ins(p, ptr, tmp, PGD_T_LOG2, (32 - PGDIR_SHIFT));
982 uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */
983 uasm_i_sll(p, tmp, tmp, PGD_T_LOG2);
984 uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */
987 #endif /* !CONFIG_64BIT */
989 static void __cpuinit build_adjust_context(u32 **p, unsigned int ctx)
991 unsigned int shift = 4 - (PTE_T_LOG2 + 1) + PAGE_SHIFT - 12;
992 unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1);
994 switch (current_cpu_type()) {
1011 UASM_i_SRL(p, ctx, ctx, shift);
1012 uasm_i_andi(p, ctx, ctx, mask);
1015 static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
1017 if (cpu_has_mips_r2) {
1018 /* PTE ptr offset is obtained from BadVAddr */
1019 UASM_i_MFC0(p, tmp, C0_BADVADDR);
1020 UASM_i_LW(p, ptr, 0, ptr);
1021 uasm_i_ext(p, tmp, tmp, PAGE_SHIFT+1, PGDIR_SHIFT-PAGE_SHIFT-1);
1022 uasm_i_ins(p, ptr, tmp, PTE_T_LOG2+1, PGDIR_SHIFT-PAGE_SHIFT-1);
1027 * Bug workaround for the Nevada. It seems as if under certain
1028 * circumstances the move from cp0_context might produce a
1029 * bogus result when the mfc0 instruction and its consumer are
1030 * in a different cacheline or a load instruction, probably any
1031 * memory reference, is between them.
1033 switch (current_cpu_type()) {
1035 UASM_i_LW(p, ptr, 0, ptr);
1036 GET_CONTEXT(p, tmp); /* get context reg */
1040 GET_CONTEXT(p, tmp); /* get context reg */
1041 UASM_i_LW(p, ptr, 0, ptr);
1045 build_adjust_context(p, tmp);
1046 UASM_i_ADDU(p, ptr, ptr, tmp); /* add in offset */
1049 static void __cpuinit build_update_entries(u32 **p, unsigned int tmp,
1053 * 64bit address support (36bit on a 32bit CPU) in a 32bit
1054 * Kernel is a special case. Only a few CPUs use it.
1056 #ifdef CONFIG_64BIT_PHYS_ADDR
1057 if (cpu_has_64bits) {
1058 uasm_i_ld(p, tmp, 0, ptep); /* get even pte */
1059 uasm_i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
1061 UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL));
1062 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1063 UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL));
1065 uasm_i_dsrl_safe(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
1066 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1067 uasm_i_dsrl_safe(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
1069 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
1071 int pte_off_even = sizeof(pte_t) / 2;
1072 int pte_off_odd = pte_off_even + sizeof(pte_t);
1074 /* The pte entries are pre-shifted */
1075 uasm_i_lw(p, tmp, pte_off_even, ptep); /* get even pte */
1076 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1077 uasm_i_lw(p, ptep, pte_off_odd, ptep); /* get odd pte */
1078 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
1081 UASM_i_LW(p, tmp, 0, ptep); /* get even pte */
1082 UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
1083 if (r45k_bvahwbug())
1084 build_tlb_probe_entry(p);
1086 UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL));
1087 if (r4k_250MHZhwbug())
1088 UASM_i_MTC0(p, 0, C0_ENTRYLO0);
1089 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1090 UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL));
1092 UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */
1093 if (r4k_250MHZhwbug())
1094 UASM_i_MTC0(p, 0, C0_ENTRYLO0);
1095 UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */
1096 UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */
1097 if (r45k_bvahwbug())
1098 uasm_i_mfc0(p, tmp, C0_INDEX);
1100 if (r4k_250MHZhwbug())
1101 UASM_i_MTC0(p, 0, C0_ENTRYLO1);
1102 UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */
1106 struct mips_huge_tlb_info {
1108 int restore_scratch;
1111 static struct mips_huge_tlb_info __cpuinit
1112 build_fast_tlb_refill_handler (u32 **p, struct uasm_label **l,
1113 struct uasm_reloc **r, unsigned int tmp,
1114 unsigned int ptr, int c0_scratch)
1116 struct mips_huge_tlb_info rv;
1117 unsigned int even, odd;
1118 int vmalloc_branch_delay_filled = 0;
1119 const int scratch = 1; /* Our extra working register */
1121 rv.huge_pte = scratch;
1122 rv.restore_scratch = 0;
1124 if (check_for_high_segbits) {
1125 UASM_i_MFC0(p, tmp, C0_BADVADDR);
1128 UASM_i_MFC0(p, ptr, 31, pgd_reg);
1130 UASM_i_MFC0(p, ptr, C0_CONTEXT);
1132 if (c0_scratch >= 0)
1133 UASM_i_MTC0(p, scratch, 31, c0_scratch);
1135 UASM_i_SW(p, scratch, scratchpad_offset(0), 0);
1137 uasm_i_dsrl_safe(p, scratch, tmp,
1138 PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3);
1139 uasm_il_bnez(p, r, scratch, label_vmalloc);
1141 if (pgd_reg == -1) {
1142 vmalloc_branch_delay_filled = 1;
1143 /* Clear lower 23 bits of context. */
1144 uasm_i_dins(p, ptr, 0, 0, 23);
1148 UASM_i_MFC0(p, ptr, 31, pgd_reg);
1150 UASM_i_MFC0(p, ptr, C0_CONTEXT);
1152 UASM_i_MFC0(p, tmp, C0_BADVADDR);
1154 if (c0_scratch >= 0)
1155 UASM_i_MTC0(p, scratch, 31, c0_scratch);
1157 UASM_i_SW(p, scratch, scratchpad_offset(0), 0);
1160 /* Clear lower 23 bits of context. */
1161 uasm_i_dins(p, ptr, 0, 0, 23);
1163 uasm_il_bltz(p, r, tmp, label_vmalloc);
1166 if (pgd_reg == -1) {
1167 vmalloc_branch_delay_filled = 1;
1168 /* 1 0 1 0 1 << 6 xkphys cached */
1169 uasm_i_ori(p, ptr, ptr, 0x540);
1170 uasm_i_drotr(p, ptr, ptr, 11);
1173 #ifdef __PAGETABLE_PMD_FOLDED
1174 #define LOC_PTEP scratch
1176 #define LOC_PTEP ptr
1179 if (!vmalloc_branch_delay_filled)
1180 /* get pgd offset in bytes */
1181 uasm_i_dsrl_safe(p, scratch, tmp, PGDIR_SHIFT - 3);
1183 uasm_l_vmalloc_done(l, *p);
1187 * fall-through case = badvaddr *pgd_current
1188 * vmalloc case = badvaddr swapper_pg_dir
1191 if (vmalloc_branch_delay_filled)
1192 /* get pgd offset in bytes */
1193 uasm_i_dsrl_safe(p, scratch, tmp, PGDIR_SHIFT - 3);
1195 #ifdef __PAGETABLE_PMD_FOLDED
1196 GET_CONTEXT(p, tmp); /* get context reg */
1198 uasm_i_andi(p, scratch, scratch, (PTRS_PER_PGD - 1) << 3);
1200 if (use_lwx_insns()) {
1201 UASM_i_LWX(p, LOC_PTEP, scratch, ptr);
1203 uasm_i_daddu(p, ptr, ptr, scratch); /* add in pgd offset */
1204 uasm_i_ld(p, LOC_PTEP, 0, ptr); /* get pmd pointer */
1207 #ifndef __PAGETABLE_PMD_FOLDED
1208 /* get pmd offset in bytes */
1209 uasm_i_dsrl_safe(p, scratch, tmp, PMD_SHIFT - 3);
1210 uasm_i_andi(p, scratch, scratch, (PTRS_PER_PMD - 1) << 3);
1211 GET_CONTEXT(p, tmp); /* get context reg */
1213 if (use_lwx_insns()) {
1214 UASM_i_LWX(p, scratch, scratch, ptr);
1216 uasm_i_daddu(p, ptr, ptr, scratch); /* add in pmd offset */
1217 UASM_i_LW(p, scratch, 0, ptr);
1220 /* Adjust the context during the load latency. */
1221 build_adjust_context(p, tmp);
1223 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1224 uasm_il_bbit1(p, r, scratch, ilog2(_PAGE_HUGE), label_tlb_huge_update);
1226 * The in the LWX case we don't want to do the load in the
1227 * delay slot. It cannot issue in the same cycle and may be
1228 * speculative and unneeded.
1230 if (use_lwx_insns())
1232 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
1235 /* build_update_entries */
1236 if (use_lwx_insns()) {
1239 UASM_i_LWX(p, even, scratch, tmp);
1240 UASM_i_ADDIU(p, tmp, tmp, sizeof(pte_t));
1241 UASM_i_LWX(p, odd, scratch, tmp);
1243 UASM_i_ADDU(p, ptr, scratch, tmp); /* add in offset */
1246 UASM_i_LW(p, even, 0, ptr); /* get even pte */
1247 UASM_i_LW(p, odd, sizeof(pte_t), ptr); /* get odd pte */
1250 uasm_i_drotr(p, even, even, ilog2(_PAGE_GLOBAL));
1251 UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */
1252 uasm_i_drotr(p, odd, odd, ilog2(_PAGE_GLOBAL));
1254 uasm_i_dsrl_safe(p, even, even, ilog2(_PAGE_GLOBAL));
1255 UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */
1256 uasm_i_dsrl_safe(p, odd, odd, ilog2(_PAGE_GLOBAL));
1258 UASM_i_MTC0(p, odd, C0_ENTRYLO1); /* load it */
1260 if (c0_scratch >= 0) {
1261 UASM_i_MFC0(p, scratch, 31, c0_scratch);
1262 build_tlb_write_entry(p, l, r, tlb_random);
1263 uasm_l_leave(l, *p);
1264 rv.restore_scratch = 1;
1265 } else if (PAGE_SHIFT == 14 || PAGE_SHIFT == 13) {
1266 build_tlb_write_entry(p, l, r, tlb_random);
1267 uasm_l_leave(l, *p);
1268 UASM_i_LW(p, scratch, scratchpad_offset(0), 0);
1270 UASM_i_LW(p, scratch, scratchpad_offset(0), 0);
1271 build_tlb_write_entry(p, l, r, tlb_random);
1272 uasm_l_leave(l, *p);
1273 rv.restore_scratch = 1;
1276 uasm_i_eret(p); /* return from trap */
1282 * For a 64-bit kernel, we are using the 64-bit XTLB refill exception
1283 * because EXL == 0. If we wrap, we can also use the 32 instruction
1284 * slots before the XTLB refill exception handler which belong to the
1285 * unused TLB refill exception.
1287 #define MIPS64_REFILL_INSNS 32
1289 static void __cpuinit build_r4000_tlb_refill_handler(void)
1291 u32 *p = tlb_handler;
1292 struct uasm_label *l = labels;
1293 struct uasm_reloc *r = relocs;
1295 unsigned int final_len;
1296 struct mips_huge_tlb_info htlb_info __maybe_unused;
1297 enum vmalloc64_mode vmalloc_mode __maybe_unused;
1299 memset(tlb_handler, 0, sizeof(tlb_handler));
1300 memset(labels, 0, sizeof(labels));
1301 memset(relocs, 0, sizeof(relocs));
1302 memset(final_handler, 0, sizeof(final_handler));
1304 if ((scratch_reg > 0 || scratchpad_available()) && use_bbit_insns()) {
1305 htlb_info = build_fast_tlb_refill_handler(&p, &l, &r, K0, K1,
1307 vmalloc_mode = refill_scratch;
1309 htlb_info.huge_pte = K0;
1310 htlb_info.restore_scratch = 0;
1311 vmalloc_mode = refill_noscratch;
1313 * create the plain linear handler
1315 if (bcm1250_m3_war()) {
1316 unsigned int segbits = 44;
1318 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
1319 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
1320 uasm_i_xor(&p, K0, K0, K1);
1321 uasm_i_dsrl_safe(&p, K1, K0, 62);
1322 uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
1323 uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
1324 uasm_i_or(&p, K0, K0, K1);
1325 uasm_il_bnez(&p, &r, K0, label_leave);
1326 /* No need for uasm_i_nop */
1330 build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
1332 build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
1335 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1336 build_is_huge_pte(&p, &r, K0, K1, label_tlb_huge_update);
1339 build_get_ptep(&p, K0, K1);
1340 build_update_entries(&p, K0, K1);
1341 build_tlb_write_entry(&p, &l, &r, tlb_random);
1342 uasm_l_leave(&l, p);
1343 uasm_i_eret(&p); /* return from trap */
1345 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1346 uasm_l_tlb_huge_update(&l, p);
1347 build_huge_update_entries(&p, htlb_info.huge_pte, K1);
1348 build_huge_tlb_write_entry(&p, &l, &r, K0, tlb_random,
1349 htlb_info.restore_scratch);
1353 build_get_pgd_vmalloc64(&p, &l, &r, K0, K1, vmalloc_mode);
1357 * Overflow check: For the 64bit handler, we need at least one
1358 * free instruction slot for the wrap-around branch. In worst
1359 * case, if the intended insertion point is a delay slot, we
1360 * need three, with the second nop'ed and the third being
1363 /* Loongson2 ebase is different than r4k, we have more space */
1364 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
1365 if ((p - tlb_handler) > 64)
1366 panic("TLB refill handler space exceeded");
1368 if (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 1)
1369 || (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 3)
1370 && uasm_insn_has_bdelay(relocs,
1371 tlb_handler + MIPS64_REFILL_INSNS - 3)))
1372 panic("TLB refill handler space exceeded");
1376 * Now fold the handler in the TLB refill handler space.
1378 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
1380 /* Simplest case, just copy the handler. */
1381 uasm_copy_handler(relocs, labels, tlb_handler, p, f);
1382 final_len = p - tlb_handler;
1383 #else /* CONFIG_64BIT */
1384 f = final_handler + MIPS64_REFILL_INSNS;
1385 if ((p - tlb_handler) <= MIPS64_REFILL_INSNS) {
1386 /* Just copy the handler. */
1387 uasm_copy_handler(relocs, labels, tlb_handler, p, f);
1388 final_len = p - tlb_handler;
1390 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1391 const enum label_id ls = label_tlb_huge_update;
1393 const enum label_id ls = label_vmalloc;
1399 for (i = 0; i < ARRAY_SIZE(labels) && labels[i].lab != ls; i++)
1401 BUG_ON(i == ARRAY_SIZE(labels));
1402 split = labels[i].addr;
1405 * See if we have overflown one way or the other.
1407 if (split > tlb_handler + MIPS64_REFILL_INSNS ||
1408 split < p - MIPS64_REFILL_INSNS)
1413 * Split two instructions before the end. One
1414 * for the branch and one for the instruction
1415 * in the delay slot.
1417 split = tlb_handler + MIPS64_REFILL_INSNS - 2;
1420 * If the branch would fall in a delay slot,
1421 * we must back up an additional instruction
1422 * so that it is no longer in a delay slot.
1424 if (uasm_insn_has_bdelay(relocs, split - 1))
1427 /* Copy first part of the handler. */
1428 uasm_copy_handler(relocs, labels, tlb_handler, split, f);
1429 f += split - tlb_handler;
1432 /* Insert branch. */
1433 uasm_l_split(&l, final_handler);
1434 uasm_il_b(&f, &r, label_split);
1435 if (uasm_insn_has_bdelay(relocs, split))
1438 uasm_copy_handler(relocs, labels,
1439 split, split + 1, f);
1440 uasm_move_labels(labels, f, f + 1, -1);
1446 /* Copy the rest of the handler. */
1447 uasm_copy_handler(relocs, labels, split, p, final_handler);
1448 final_len = (f - (final_handler + MIPS64_REFILL_INSNS)) +
1451 #endif /* CONFIG_64BIT */
1453 uasm_resolve_relocs(relocs, labels);
1454 pr_debug("Wrote TLB refill handler (%u instructions).\n",
1457 memcpy((void *)ebase, final_handler, 0x100);
1459 dump_handler("r4000_tlb_refill", (u32 *)ebase, 64);
1463 * 128 instructions for the fastpath handler is generous and should
1464 * never be exceeded.
1466 #define FASTPATH_SIZE 128
1468 u32 handle_tlbl[FASTPATH_SIZE] __cacheline_aligned;
1469 u32 handle_tlbs[FASTPATH_SIZE] __cacheline_aligned;
1470 u32 handle_tlbm[FASTPATH_SIZE] __cacheline_aligned;
1471 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
1472 u32 tlbmiss_handler_setup_pgd[16] __cacheline_aligned;
1474 static void __cpuinit build_r4000_setup_pgd(void)
1478 u32 *p = tlbmiss_handler_setup_pgd;
1479 struct uasm_label *l = labels;
1480 struct uasm_reloc *r = relocs;
1482 memset(tlbmiss_handler_setup_pgd, 0, sizeof(tlbmiss_handler_setup_pgd));
1483 memset(labels, 0, sizeof(labels));
1484 memset(relocs, 0, sizeof(relocs));
1486 pgd_reg = allocate_kscratch();
1488 if (pgd_reg == -1) {
1489 /* PGD << 11 in c0_Context */
1491 * If it is a ckseg0 address, convert to a physical
1492 * address. Shifting right by 29 and adding 4 will
1493 * result in zero for these addresses.
1496 UASM_i_SRA(&p, a1, a0, 29);
1497 UASM_i_ADDIU(&p, a1, a1, 4);
1498 uasm_il_bnez(&p, &r, a1, label_tlbl_goaround1);
1500 uasm_i_dinsm(&p, a0, 0, 29, 64 - 29);
1501 uasm_l_tlbl_goaround1(&l, p);
1502 UASM_i_SLL(&p, a0, a0, 11);
1504 UASM_i_MTC0(&p, a0, C0_CONTEXT);
1506 /* PGD in c0_KScratch */
1508 UASM_i_MTC0(&p, a0, 31, pgd_reg);
1510 if (p - tlbmiss_handler_setup_pgd > ARRAY_SIZE(tlbmiss_handler_setup_pgd))
1511 panic("tlbmiss_handler_setup_pgd space exceeded");
1512 uasm_resolve_relocs(relocs, labels);
1513 pr_debug("Wrote tlbmiss_handler_setup_pgd (%u instructions).\n",
1514 (unsigned int)(p - tlbmiss_handler_setup_pgd));
1516 dump_handler("tlbmiss_handler",
1517 tlbmiss_handler_setup_pgd,
1518 ARRAY_SIZE(tlbmiss_handler_setup_pgd));
1522 static void __cpuinit
1523 iPTE_LW(u32 **p, unsigned int pte, unsigned int ptr)
1526 # ifdef CONFIG_64BIT_PHYS_ADDR
1528 uasm_i_lld(p, pte, 0, ptr);
1531 UASM_i_LL(p, pte, 0, ptr);
1533 # ifdef CONFIG_64BIT_PHYS_ADDR
1535 uasm_i_ld(p, pte, 0, ptr);
1538 UASM_i_LW(p, pte, 0, ptr);
1542 static void __cpuinit
1543 iPTE_SW(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr,
1546 #ifdef CONFIG_64BIT_PHYS_ADDR
1547 unsigned int hwmode = mode & (_PAGE_VALID | _PAGE_DIRTY);
1550 uasm_i_ori(p, pte, pte, mode);
1552 # ifdef CONFIG_64BIT_PHYS_ADDR
1554 uasm_i_scd(p, pte, 0, ptr);
1557 UASM_i_SC(p, pte, 0, ptr);
1559 if (r10000_llsc_war())
1560 uasm_il_beqzl(p, r, pte, label_smp_pgtable_change);
1562 uasm_il_beqz(p, r, pte, label_smp_pgtable_change);
1564 # ifdef CONFIG_64BIT_PHYS_ADDR
1565 if (!cpu_has_64bits) {
1566 /* no uasm_i_nop needed */
1567 uasm_i_ll(p, pte, sizeof(pte_t) / 2, ptr);
1568 uasm_i_ori(p, pte, pte, hwmode);
1569 uasm_i_sc(p, pte, sizeof(pte_t) / 2, ptr);
1570 uasm_il_beqz(p, r, pte, label_smp_pgtable_change);
1571 /* no uasm_i_nop needed */
1572 uasm_i_lw(p, pte, 0, ptr);
1579 # ifdef CONFIG_64BIT_PHYS_ADDR
1581 uasm_i_sd(p, pte, 0, ptr);
1584 UASM_i_SW(p, pte, 0, ptr);
1586 # ifdef CONFIG_64BIT_PHYS_ADDR
1587 if (!cpu_has_64bits) {
1588 uasm_i_lw(p, pte, sizeof(pte_t) / 2, ptr);
1589 uasm_i_ori(p, pte, pte, hwmode);
1590 uasm_i_sw(p, pte, sizeof(pte_t) / 2, ptr);
1591 uasm_i_lw(p, pte, 0, ptr);
1598 * Check if PTE is present, if not then jump to LABEL. PTR points to
1599 * the page table where this PTE is located, PTE will be re-loaded
1600 * with it's original value.
1602 static void __cpuinit
1603 build_pte_present(u32 **p, struct uasm_reloc **r,
1604 int pte, int ptr, int scratch, enum label_id lid)
1606 int t = scratch >= 0 ? scratch : pte;
1609 if (use_bbit_insns()) {
1610 uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid);
1613 uasm_i_andi(p, t, pte, _PAGE_PRESENT);
1614 uasm_il_beqz(p, r, t, lid);
1616 /* You lose the SMP race :-(*/
1617 iPTE_LW(p, pte, ptr);
1620 uasm_i_andi(p, t, pte, _PAGE_PRESENT | _PAGE_READ);
1621 uasm_i_xori(p, t, t, _PAGE_PRESENT | _PAGE_READ);
1622 uasm_il_bnez(p, r, t, lid);
1624 /* You lose the SMP race :-(*/
1625 iPTE_LW(p, pte, ptr);
1629 /* Make PTE valid, store result in PTR. */
1630 static void __cpuinit
1631 build_make_valid(u32 **p, struct uasm_reloc **r, unsigned int pte,
1634 unsigned int mode = _PAGE_VALID | _PAGE_ACCESSED;
1636 iPTE_SW(p, r, pte, ptr, mode);
1640 * Check if PTE can be written to, if not branch to LABEL. Regardless
1641 * restore PTE with value from PTR when done.
1643 static void __cpuinit
1644 build_pte_writable(u32 **p, struct uasm_reloc **r,
1645 unsigned int pte, unsigned int ptr, int scratch,
1648 int t = scratch >= 0 ? scratch : pte;
1650 uasm_i_andi(p, t, pte, _PAGE_PRESENT | _PAGE_WRITE);
1651 uasm_i_xori(p, t, t, _PAGE_PRESENT | _PAGE_WRITE);
1652 uasm_il_bnez(p, r, t, lid);
1654 /* You lose the SMP race :-(*/
1655 iPTE_LW(p, pte, ptr);
1660 /* Make PTE writable, update software status bits as well, then store
1663 static void __cpuinit
1664 build_make_write(u32 **p, struct uasm_reloc **r, unsigned int pte,
1667 unsigned int mode = (_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID
1670 iPTE_SW(p, r, pte, ptr, mode);
1674 * Check if PTE can be modified, if not branch to LABEL. Regardless
1675 * restore PTE with value from PTR when done.
1677 static void __cpuinit
1678 build_pte_modifiable(u32 **p, struct uasm_reloc **r,
1679 unsigned int pte, unsigned int ptr, int scratch,
1682 if (use_bbit_insns()) {
1683 uasm_il_bbit0(p, r, pte, ilog2(_PAGE_WRITE), lid);
1686 int t = scratch >= 0 ? scratch : pte;
1687 uasm_i_andi(p, t, pte, _PAGE_WRITE);
1688 uasm_il_beqz(p, r, t, lid);
1690 /* You lose the SMP race :-(*/
1691 iPTE_LW(p, pte, ptr);
1695 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
1699 * R3000 style TLB load/store/modify handlers.
1703 * This places the pte into ENTRYLO0 and writes it with tlbwi.
1706 static void __cpuinit
1707 build_r3000_pte_reload_tlbwi(u32 **p, unsigned int pte, unsigned int tmp)
1709 uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1710 uasm_i_mfc0(p, tmp, C0_EPC); /* cp0 delay */
1713 uasm_i_rfe(p); /* branch delay */
1717 * This places the pte into ENTRYLO0 and writes it with tlbwi
1718 * or tlbwr as appropriate. This is because the index register
1719 * may have the probe fail bit set as a result of a trap on a
1720 * kseg2 access, i.e. without refill. Then it returns.
1722 static void __cpuinit
1723 build_r3000_tlb_reload_write(u32 **p, struct uasm_label **l,
1724 struct uasm_reloc **r, unsigned int pte,
1727 uasm_i_mfc0(p, tmp, C0_INDEX);
1728 uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1729 uasm_il_bltz(p, r, tmp, label_r3000_write_probe_fail); /* cp0 delay */
1730 uasm_i_mfc0(p, tmp, C0_EPC); /* branch delay */
1731 uasm_i_tlbwi(p); /* cp0 delay */
1733 uasm_i_rfe(p); /* branch delay */
1734 uasm_l_r3000_write_probe_fail(l, *p);
1735 uasm_i_tlbwr(p); /* cp0 delay */
1737 uasm_i_rfe(p); /* branch delay */
1740 static void __cpuinit
1741 build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte,
1744 long pgdc = (long)pgd_current;
1746 uasm_i_mfc0(p, pte, C0_BADVADDR);
1747 uasm_i_lui(p, ptr, uasm_rel_hi(pgdc)); /* cp0 delay */
1748 uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
1749 uasm_i_srl(p, pte, pte, 22); /* load delay */
1750 uasm_i_sll(p, pte, pte, 2);
1751 uasm_i_addu(p, ptr, ptr, pte);
1752 uasm_i_mfc0(p, pte, C0_CONTEXT);
1753 uasm_i_lw(p, ptr, 0, ptr); /* cp0 delay */
1754 uasm_i_andi(p, pte, pte, 0xffc); /* load delay */
1755 uasm_i_addu(p, ptr, ptr, pte);
1756 uasm_i_lw(p, pte, 0, ptr);
1757 uasm_i_tlbp(p); /* load delay */
1760 static void __cpuinit build_r3000_tlb_load_handler(void)
1762 u32 *p = handle_tlbl;
1763 struct uasm_label *l = labels;
1764 struct uasm_reloc *r = relocs;
1766 memset(handle_tlbl, 0, sizeof(handle_tlbl));
1767 memset(labels, 0, sizeof(labels));
1768 memset(relocs, 0, sizeof(relocs));
1770 build_r3000_tlbchange_handler_head(&p, K0, K1);
1771 build_pte_present(&p, &r, K0, K1, -1, label_nopage_tlbl);
1772 uasm_i_nop(&p); /* load delay */
1773 build_make_valid(&p, &r, K0, K1);
1774 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
1776 uasm_l_nopage_tlbl(&l, p);
1777 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
1780 if ((p - handle_tlbl) > FASTPATH_SIZE)
1781 panic("TLB load handler fastpath space exceeded");
1783 uasm_resolve_relocs(relocs, labels);
1784 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
1785 (unsigned int)(p - handle_tlbl));
1787 dump_handler("r3000_tlb_load", handle_tlbl, ARRAY_SIZE(handle_tlbl));
1790 static void __cpuinit build_r3000_tlb_store_handler(void)
1792 u32 *p = handle_tlbs;
1793 struct uasm_label *l = labels;
1794 struct uasm_reloc *r = relocs;
1796 memset(handle_tlbs, 0, sizeof(handle_tlbs));
1797 memset(labels, 0, sizeof(labels));
1798 memset(relocs, 0, sizeof(relocs));
1800 build_r3000_tlbchange_handler_head(&p, K0, K1);
1801 build_pte_writable(&p, &r, K0, K1, -1, label_nopage_tlbs);
1802 uasm_i_nop(&p); /* load delay */
1803 build_make_write(&p, &r, K0, K1);
1804 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
1806 uasm_l_nopage_tlbs(&l, p);
1807 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1810 if ((p - handle_tlbs) > FASTPATH_SIZE)
1811 panic("TLB store handler fastpath space exceeded");
1813 uasm_resolve_relocs(relocs, labels);
1814 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
1815 (unsigned int)(p - handle_tlbs));
1817 dump_handler("r3000_tlb_store", handle_tlbs, ARRAY_SIZE(handle_tlbs));
1820 static void __cpuinit build_r3000_tlb_modify_handler(void)
1822 u32 *p = handle_tlbm;
1823 struct uasm_label *l = labels;
1824 struct uasm_reloc *r = relocs;
1826 memset(handle_tlbm, 0, sizeof(handle_tlbm));
1827 memset(labels, 0, sizeof(labels));
1828 memset(relocs, 0, sizeof(relocs));
1830 build_r3000_tlbchange_handler_head(&p, K0, K1);
1831 build_pte_modifiable(&p, &r, K0, K1, -1, label_nopage_tlbm);
1832 uasm_i_nop(&p); /* load delay */
1833 build_make_write(&p, &r, K0, K1);
1834 build_r3000_pte_reload_tlbwi(&p, K0, K1);
1836 uasm_l_nopage_tlbm(&l, p);
1837 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1840 if ((p - handle_tlbm) > FASTPATH_SIZE)
1841 panic("TLB modify handler fastpath space exceeded");
1843 uasm_resolve_relocs(relocs, labels);
1844 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
1845 (unsigned int)(p - handle_tlbm));
1847 dump_handler("r3000_tlb_modify", handle_tlbm, ARRAY_SIZE(handle_tlbm));
1849 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
1852 * R4000 style TLB load/store/modify handlers.
1854 static struct work_registers __cpuinit
1855 build_r4000_tlbchange_handler_head(u32 **p, struct uasm_label **l,
1856 struct uasm_reloc **r)
1858 struct work_registers wr = build_get_work_registers(p);
1861 build_get_pmde64(p, l, r, wr.r1, wr.r2); /* get pmd in ptr */
1863 build_get_pgde32(p, wr.r1, wr.r2); /* get pgd in ptr */
1866 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1868 * For huge tlb entries, pmd doesn't contain an address but
1869 * instead contains the tlb pte. Check the PAGE_HUGE bit and
1870 * see if we need to jump to huge tlb processing.
1872 build_is_huge_pte(p, r, wr.r1, wr.r2, label_tlb_huge_update);
1875 UASM_i_MFC0(p, wr.r1, C0_BADVADDR);
1876 UASM_i_LW(p, wr.r2, 0, wr.r2);
1877 UASM_i_SRL(p, wr.r1, wr.r1, PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2);
1878 uasm_i_andi(p, wr.r1, wr.r1, (PTRS_PER_PTE - 1) << PTE_T_LOG2);
1879 UASM_i_ADDU(p, wr.r2, wr.r2, wr.r1);
1882 uasm_l_smp_pgtable_change(l, *p);
1884 iPTE_LW(p, wr.r1, wr.r2); /* get even pte */
1885 if (!m4kc_tlbp_war())
1886 build_tlb_probe_entry(p);
1890 static void __cpuinit
1891 build_r4000_tlbchange_handler_tail(u32 **p, struct uasm_label **l,
1892 struct uasm_reloc **r, unsigned int tmp,
1895 uasm_i_ori(p, ptr, ptr, sizeof(pte_t));
1896 uasm_i_xori(p, ptr, ptr, sizeof(pte_t));
1897 build_update_entries(p, tmp, ptr);
1898 build_tlb_write_entry(p, l, r, tlb_indexed);
1899 uasm_l_leave(l, *p);
1900 build_restore_work_registers(p);
1901 uasm_i_eret(p); /* return from trap */
1904 build_get_pgd_vmalloc64(p, l, r, tmp, ptr, not_refill);
1908 static void __cpuinit build_r4000_tlb_load_handler(void)
1910 u32 *p = handle_tlbl;
1911 struct uasm_label *l = labels;
1912 struct uasm_reloc *r = relocs;
1913 struct work_registers wr;
1915 memset(handle_tlbl, 0, sizeof(handle_tlbl));
1916 memset(labels, 0, sizeof(labels));
1917 memset(relocs, 0, sizeof(relocs));
1919 if (bcm1250_m3_war()) {
1920 unsigned int segbits = 44;
1922 uasm_i_dmfc0(&p, K0, C0_BADVADDR);
1923 uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
1924 uasm_i_xor(&p, K0, K0, K1);
1925 uasm_i_dsrl_safe(&p, K1, K0, 62);
1926 uasm_i_dsrl_safe(&p, K0, K0, 12 + 1);
1927 uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits);
1928 uasm_i_or(&p, K0, K0, K1);
1929 uasm_il_bnez(&p, &r, K0, label_leave);
1930 /* No need for uasm_i_nop */
1933 wr = build_r4000_tlbchange_handler_head(&p, &l, &r);
1934 build_pte_present(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbl);
1935 if (m4kc_tlbp_war())
1936 build_tlb_probe_entry(&p);
1940 * If the page is not _PAGE_VALID, RI or XI could not
1941 * have triggered it. Skip the expensive test..
1943 if (use_bbit_insns()) {
1944 uasm_il_bbit0(&p, &r, wr.r1, ilog2(_PAGE_VALID),
1945 label_tlbl_goaround1);
1947 uasm_i_andi(&p, wr.r3, wr.r1, _PAGE_VALID);
1948 uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround1);
1953 /* Examine entrylo 0 or 1 based on ptr. */
1954 if (use_bbit_insns()) {
1955 uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8);
1957 uasm_i_andi(&p, wr.r3, wr.r2, sizeof(pte_t));
1958 uasm_i_beqz(&p, wr.r3, 8);
1960 /* load it in the delay slot*/
1961 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO0);
1962 /* load it if ptr is odd */
1963 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO1);
1965 * If the entryLo (now in wr.r3) is valid (bit 1), RI or
1966 * XI must have triggered it.
1968 if (use_bbit_insns()) {
1969 uasm_il_bbit1(&p, &r, wr.r3, 1, label_nopage_tlbl);
1971 uasm_l_tlbl_goaround1(&l, p);
1973 uasm_i_andi(&p, wr.r3, wr.r3, 2);
1974 uasm_il_bnez(&p, &r, wr.r3, label_nopage_tlbl);
1977 uasm_l_tlbl_goaround1(&l, p);
1979 build_make_valid(&p, &r, wr.r1, wr.r2);
1980 build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2);
1982 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1984 * This is the entry point when build_r4000_tlbchange_handler_head
1985 * spots a huge page.
1987 uasm_l_tlb_huge_update(&l, p);
1988 iPTE_LW(&p, wr.r1, wr.r2);
1989 build_pte_present(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbl);
1990 build_tlb_probe_entry(&p);
1994 * If the page is not _PAGE_VALID, RI or XI could not
1995 * have triggered it. Skip the expensive test..
1997 if (use_bbit_insns()) {
1998 uasm_il_bbit0(&p, &r, wr.r1, ilog2(_PAGE_VALID),
1999 label_tlbl_goaround2);
2001 uasm_i_andi(&p, wr.r3, wr.r1, _PAGE_VALID);
2002 uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround2);
2007 /* Examine entrylo 0 or 1 based on ptr. */
2008 if (use_bbit_insns()) {
2009 uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8);
2011 uasm_i_andi(&p, wr.r3, wr.r2, sizeof(pte_t));
2012 uasm_i_beqz(&p, wr.r3, 8);
2014 /* load it in the delay slot*/
2015 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO0);
2016 /* load it if ptr is odd */
2017 UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO1);
2019 * If the entryLo (now in wr.r3) is valid (bit 1), RI or
2020 * XI must have triggered it.
2022 if (use_bbit_insns()) {
2023 uasm_il_bbit0(&p, &r, wr.r3, 1, label_tlbl_goaround2);
2025 uasm_i_andi(&p, wr.r3, wr.r3, 2);
2026 uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround2);
2028 if (PM_DEFAULT_MASK == 0)
2031 * We clobbered C0_PAGEMASK, restore it. On the other branch
2032 * it is restored in build_huge_tlb_write_entry.
2034 build_restore_pagemask(&p, &r, wr.r3, label_nopage_tlbl, 0);
2036 uasm_l_tlbl_goaround2(&l, p);
2038 uasm_i_ori(&p, wr.r1, wr.r1, (_PAGE_ACCESSED | _PAGE_VALID));
2039 build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
2042 uasm_l_nopage_tlbl(&l, p);
2043 build_restore_work_registers(&p);
2044 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
2047 if ((p - handle_tlbl) > FASTPATH_SIZE)
2048 panic("TLB load handler fastpath space exceeded");
2050 uasm_resolve_relocs(relocs, labels);
2051 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
2052 (unsigned int)(p - handle_tlbl));
2054 dump_handler("r4000_tlb_load", handle_tlbl, ARRAY_SIZE(handle_tlbl));
2057 static void __cpuinit build_r4000_tlb_store_handler(void)
2059 u32 *p = handle_tlbs;
2060 struct uasm_label *l = labels;
2061 struct uasm_reloc *r = relocs;
2062 struct work_registers wr;
2064 memset(handle_tlbs, 0, sizeof(handle_tlbs));
2065 memset(labels, 0, sizeof(labels));
2066 memset(relocs, 0, sizeof(relocs));
2068 wr = build_r4000_tlbchange_handler_head(&p, &l, &r);
2069 build_pte_writable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbs);
2070 if (m4kc_tlbp_war())
2071 build_tlb_probe_entry(&p);
2072 build_make_write(&p, &r, wr.r1, wr.r2);
2073 build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2);
2075 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
2077 * This is the entry point when
2078 * build_r4000_tlbchange_handler_head spots a huge page.
2080 uasm_l_tlb_huge_update(&l, p);
2081 iPTE_LW(&p, wr.r1, wr.r2);
2082 build_pte_writable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbs);
2083 build_tlb_probe_entry(&p);
2084 uasm_i_ori(&p, wr.r1, wr.r1,
2085 _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
2086 build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
2089 uasm_l_nopage_tlbs(&l, p);
2090 build_restore_work_registers(&p);
2091 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
2094 if ((p - handle_tlbs) > FASTPATH_SIZE)
2095 panic("TLB store handler fastpath space exceeded");
2097 uasm_resolve_relocs(relocs, labels);
2098 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
2099 (unsigned int)(p - handle_tlbs));
2101 dump_handler("r4000_tlb_store", handle_tlbs, ARRAY_SIZE(handle_tlbs));
2104 static void __cpuinit build_r4000_tlb_modify_handler(void)
2106 u32 *p = handle_tlbm;
2107 struct uasm_label *l = labels;
2108 struct uasm_reloc *r = relocs;
2109 struct work_registers wr;
2111 memset(handle_tlbm, 0, sizeof(handle_tlbm));
2112 memset(labels, 0, sizeof(labels));
2113 memset(relocs, 0, sizeof(relocs));
2115 wr = build_r4000_tlbchange_handler_head(&p, &l, &r);
2116 build_pte_modifiable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbm);
2117 if (m4kc_tlbp_war())
2118 build_tlb_probe_entry(&p);
2119 /* Present and writable bits set, set accessed and dirty bits. */
2120 build_make_write(&p, &r, wr.r1, wr.r2);
2121 build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2);
2123 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
2125 * This is the entry point when
2126 * build_r4000_tlbchange_handler_head spots a huge page.
2128 uasm_l_tlb_huge_update(&l, p);
2129 iPTE_LW(&p, wr.r1, wr.r2);
2130 build_pte_modifiable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbm);
2131 build_tlb_probe_entry(&p);
2132 uasm_i_ori(&p, wr.r1, wr.r1,
2133 _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY);
2134 build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2);
2137 uasm_l_nopage_tlbm(&l, p);
2138 build_restore_work_registers(&p);
2139 uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
2142 if ((p - handle_tlbm) > FASTPATH_SIZE)
2143 panic("TLB modify handler fastpath space exceeded");
2145 uasm_resolve_relocs(relocs, labels);
2146 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
2147 (unsigned int)(p - handle_tlbm));
2149 dump_handler("r4000_tlb_modify", handle_tlbm, ARRAY_SIZE(handle_tlbm));
2152 void __cpuinit build_tlb_refill_handler(void)
2155 * The refill handler is generated per-CPU, multi-node systems
2156 * may have local storage for it. The other handlers are only
2159 static int run_once = 0;
2161 output_pgtable_bits_defines();
2164 check_for_high_segbits = current_cpu_data.vmbits > (PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3);
2167 switch (current_cpu_type()) {
2175 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
2176 build_r3000_tlb_refill_handler();
2178 build_r3000_tlb_load_handler();
2179 build_r3000_tlb_store_handler();
2180 build_r3000_tlb_modify_handler();
2184 panic("No R3000 TLB refill handler");
2190 panic("No R6000 TLB refill handler yet");
2194 panic("No R8000 TLB refill handler yet");
2199 scratch_reg = allocate_kscratch();
2200 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
2201 build_r4000_setup_pgd();
2203 build_r4000_tlb_load_handler();
2204 build_r4000_tlb_store_handler();
2205 build_r4000_tlb_modify_handler();
2208 build_r4000_tlb_refill_handler();
2212 void __cpuinit flush_tlb_handlers(void)
2214 local_flush_icache_range((unsigned long)handle_tlbl,
2215 (unsigned long)handle_tlbl + sizeof(handle_tlbl));
2216 local_flush_icache_range((unsigned long)handle_tlbs,
2217 (unsigned long)handle_tlbs + sizeof(handle_tlbs));
2218 local_flush_icache_range((unsigned long)handle_tlbm,
2219 (unsigned long)handle_tlbm + sizeof(handle_tlbm));
2220 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
2221 local_flush_icache_range((unsigned long)tlbmiss_handler_setup_pgd,
2222 (unsigned long)tlbmiss_handler_setup_pgd + sizeof(handle_tlbm));