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 __cpuinit
uasm_bgezl_hazard(u32
**p
,
187 struct uasm_reloc
**r
,
192 uasm_il_bgezl(p
, r
, 0, label_tlbw_hazard_0
+ instance
);
199 static void __cpuinit
uasm_bgezl_label(struct uasm_label
**l
,
205 uasm_build_label(l
, *p
, label_tlbw_hazard_0
+ instance
);
213 * pgtable bits are assigned dynamically depending on processor feature
214 * and statically based on kernel configuration. This spits out the actual
215 * values the kernel is using. Required to make sense from disassembled
216 * TLB exception handlers.
218 static void output_pgtable_bits_defines(void)
220 #define pr_define(fmt, ...) \
221 pr_debug("#define " fmt, ##__VA_ARGS__)
223 pr_debug("#include <asm/asm.h>\n");
224 pr_debug("#include <asm/regdef.h>\n");
227 pr_define("_PAGE_PRESENT_SHIFT %d\n", _PAGE_PRESENT_SHIFT
);
228 pr_define("_PAGE_READ_SHIFT %d\n", _PAGE_READ_SHIFT
);
229 pr_define("_PAGE_WRITE_SHIFT %d\n", _PAGE_WRITE_SHIFT
);
230 pr_define("_PAGE_ACCESSED_SHIFT %d\n", _PAGE_ACCESSED_SHIFT
);
231 pr_define("_PAGE_MODIFIED_SHIFT %d\n", _PAGE_MODIFIED_SHIFT
);
232 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
233 pr_define("_PAGE_HUGE_SHIFT %d\n", _PAGE_HUGE_SHIFT
);
234 pr_define("_PAGE_SPLITTING_SHIFT %d\n", _PAGE_SPLITTING_SHIFT
);
237 #ifdef _PAGE_NO_EXEC_SHIFT
238 pr_define("_PAGE_NO_EXEC_SHIFT %d\n", _PAGE_NO_EXEC_SHIFT
);
240 #ifdef _PAGE_NO_READ_SHIFT
241 pr_define("_PAGE_NO_READ_SHIFT %d\n", _PAGE_NO_READ_SHIFT
);
244 pr_define("_PAGE_GLOBAL_SHIFT %d\n", _PAGE_GLOBAL_SHIFT
);
245 pr_define("_PAGE_VALID_SHIFT %d\n", _PAGE_VALID_SHIFT
);
246 pr_define("_PAGE_DIRTY_SHIFT %d\n", _PAGE_DIRTY_SHIFT
);
247 pr_define("_PFN_SHIFT %d\n", _PFN_SHIFT
);
251 static inline void dump_handler(const char *symbol
, const u32
*handler
, int count
)
255 pr_debug("LEAF(%s)\n", symbol
);
257 pr_debug("\t.set push\n");
258 pr_debug("\t.set noreorder\n");
260 for (i
= 0; i
< count
; i
++)
261 pr_debug("\t.word\t0x%08x\t\t# %p\n", handler
[i
], &handler
[i
]);
263 pr_debug("\t.set\tpop\n");
265 pr_debug("\tEND(%s)\n", symbol
);
268 /* The only general purpose registers allowed in TLB handlers. */
272 /* Some CP0 registers */
273 #define C0_INDEX 0, 0
274 #define C0_ENTRYLO0 2, 0
275 #define C0_TCBIND 2, 2
276 #define C0_ENTRYLO1 3, 0
277 #define C0_CONTEXT 4, 0
278 #define C0_PAGEMASK 5, 0
279 #define C0_BADVADDR 8, 0
280 #define C0_ENTRYHI 10, 0
282 #define C0_XCONTEXT 20, 0
285 # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_XCONTEXT)
287 # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_CONTEXT)
290 /* The worst case length of the handler is around 18 instructions for
291 * R3000-style TLBs and up to 63 instructions for R4000-style TLBs.
292 * Maximum space available is 32 instructions for R3000 and 64
293 * instructions for R4000.
295 * We deliberately chose a buffer size of 128, so we won't scribble
296 * over anything important on overflow before we panic.
298 static u32 tlb_handler
[128] __cpuinitdata
;
300 /* simply assume worst case size for labels and relocs */
301 static struct uasm_label labels
[128] __cpuinitdata
;
302 static struct uasm_reloc relocs
[128] __cpuinitdata
;
305 static int check_for_high_segbits __cpuinitdata
;
308 static int check_for_high_segbits __cpuinitdata
;
310 static unsigned int kscratch_used_mask __cpuinitdata
;
312 static int __cpuinit
allocate_kscratch(void)
315 unsigned int a
= cpu_data
[0].kscratch_mask
& ~kscratch_used_mask
;
322 r
--; /* make it zero based */
324 kscratch_used_mask
|= (1 << r
);
329 static int scratch_reg __cpuinitdata
;
330 static int pgd_reg __cpuinitdata
;
331 enum vmalloc64_mode
{not_refill
, refill_scratch
, refill_noscratch
};
333 static struct work_registers __cpuinit
build_get_work_registers(u32
**p
)
335 struct work_registers r
;
337 int smp_processor_id_reg
;
338 int smp_processor_id_sel
;
339 int smp_processor_id_shift
;
341 if (scratch_reg
> 0) {
342 /* Save in CPU local C0_KScratch? */
343 UASM_i_MTC0(p
, 1, 31, scratch_reg
);
350 if (num_possible_cpus() > 1) {
351 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
352 smp_processor_id_shift
= 51;
353 smp_processor_id_reg
= 20; /* XContext */
354 smp_processor_id_sel
= 0;
357 smp_processor_id_shift
= 25;
358 smp_processor_id_reg
= 4; /* Context */
359 smp_processor_id_sel
= 0;
362 smp_processor_id_shift
= 26;
363 smp_processor_id_reg
= 4; /* Context */
364 smp_processor_id_sel
= 0;
367 /* Get smp_processor_id */
368 UASM_i_MFC0(p
, K0
, smp_processor_id_reg
, smp_processor_id_sel
);
369 UASM_i_SRL_SAFE(p
, K0
, K0
, smp_processor_id_shift
);
371 /* handler_reg_save index in K0 */
372 UASM_i_SLL(p
, K0
, K0
, ilog2(sizeof(struct tlb_reg_save
)));
374 UASM_i_LA(p
, K1
, (long)&handler_reg_save
);
375 UASM_i_ADDU(p
, K0
, K0
, K1
);
377 UASM_i_LA(p
, K0
, (long)&handler_reg_save
);
379 /* K0 now points to save area, save $1 and $2 */
380 UASM_i_SW(p
, 1, offsetof(struct tlb_reg_save
, a
), K0
);
381 UASM_i_SW(p
, 2, offsetof(struct tlb_reg_save
, b
), K0
);
389 static void __cpuinit
build_restore_work_registers(u32
**p
)
391 if (scratch_reg
> 0) {
392 UASM_i_MFC0(p
, 1, 31, scratch_reg
);
395 /* K0 already points to save area, restore $1 and $2 */
396 UASM_i_LW(p
, 1, offsetof(struct tlb_reg_save
, a
), K0
);
397 UASM_i_LW(p
, 2, offsetof(struct tlb_reg_save
, b
), K0
);
400 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
403 * CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current,
404 * we cannot do r3000 under these circumstances.
406 * Declare pgd_current here instead of including mmu_context.h to avoid type
407 * conflicts for tlbmiss_handler_setup_pgd
409 extern unsigned long pgd_current
[];
412 * The R3000 TLB handler is simple.
414 static void __cpuinit
build_r3000_tlb_refill_handler(void)
416 long pgdc
= (long)pgd_current
;
419 memset(tlb_handler
, 0, sizeof(tlb_handler
));
422 uasm_i_mfc0(&p
, K0
, C0_BADVADDR
);
423 uasm_i_lui(&p
, K1
, uasm_rel_hi(pgdc
)); /* cp0 delay */
424 uasm_i_lw(&p
, K1
, uasm_rel_lo(pgdc
), K1
);
425 uasm_i_srl(&p
, K0
, K0
, 22); /* load delay */
426 uasm_i_sll(&p
, K0
, K0
, 2);
427 uasm_i_addu(&p
, K1
, K1
, K0
);
428 uasm_i_mfc0(&p
, K0
, C0_CONTEXT
);
429 uasm_i_lw(&p
, K1
, 0, K1
); /* cp0 delay */
430 uasm_i_andi(&p
, K0
, K0
, 0xffc); /* load delay */
431 uasm_i_addu(&p
, K1
, K1
, K0
);
432 uasm_i_lw(&p
, K0
, 0, K1
);
433 uasm_i_nop(&p
); /* load delay */
434 uasm_i_mtc0(&p
, K0
, C0_ENTRYLO0
);
435 uasm_i_mfc0(&p
, K1
, C0_EPC
); /* cp0 delay */
436 uasm_i_tlbwr(&p
); /* cp0 delay */
438 uasm_i_rfe(&p
); /* branch delay */
440 if (p
> tlb_handler
+ 32)
441 panic("TLB refill handler space exceeded");
443 pr_debug("Wrote TLB refill handler (%u instructions).\n",
444 (unsigned int)(p
- tlb_handler
));
446 memcpy((void *)ebase
, tlb_handler
, 0x80);
448 dump_handler("r3000_tlb_refill", (u32
*)ebase
, 32);
450 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
453 * The R4000 TLB handler is much more complicated. We have two
454 * consecutive handler areas with 32 instructions space each.
455 * Since they aren't used at the same time, we can overflow in the
456 * other one.To keep things simple, we first assume linear space,
457 * then we relocate it to the final handler layout as needed.
459 static u32 final_handler
[64] __cpuinitdata
;
464 * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0:
465 * 2. A timing hazard exists for the TLBP instruction.
467 * stalling_instruction
470 * The JTLB is being read for the TLBP throughout the stall generated by the
471 * previous instruction. This is not really correct as the stalling instruction
472 * can modify the address used to access the JTLB. The failure symptom is that
473 * the TLBP instruction will use an address created for the stalling instruction
474 * and not the address held in C0_ENHI and thus report the wrong results.
476 * The software work-around is to not allow the instruction preceding the TLBP
477 * to stall - make it an NOP or some other instruction guaranteed not to stall.
479 * Errata 2 will not be fixed. This errata is also on the R5000.
481 * As if we MIPS hackers wouldn't know how to nop pipelines happy ...
483 static void __cpuinit __maybe_unused
build_tlb_probe_entry(u32
**p
)
485 switch (current_cpu_type()) {
486 /* Found by experiment: R4600 v2.0/R4700 needs this, too. */
502 * Write random or indexed TLB entry, and care about the hazards from
503 * the preceding mtc0 and for the following eret.
505 enum tlb_write_entry
{ tlb_random
, tlb_indexed
};
507 static void __cpuinit
build_tlb_write_entry(u32
**p
, struct uasm_label
**l
,
508 struct uasm_reloc
**r
,
509 enum tlb_write_entry wmode
)
511 void(*tlbw
)(u32
**) = NULL
;
514 case tlb_random
: tlbw
= uasm_i_tlbwr
; break;
515 case tlb_indexed
: tlbw
= uasm_i_tlbwi
; break;
518 if (cpu_has_mips_r2
) {
520 * The architecture spec says an ehb is required here,
521 * but a number of cores do not have the hazard and
522 * using an ehb causes an expensive pipeline stall.
524 switch (current_cpu_type()) {
537 switch (current_cpu_type()) {
545 * This branch uses up a mtc0 hazard nop slot and saves
546 * two nops after the tlbw instruction.
548 uasm_bgezl_hazard(p
, r
, hazard_instance
);
550 uasm_bgezl_label(l
, p
, hazard_instance
);
564 uasm_i_nop(p
); /* QED specifies 2 nops hazard */
565 uasm_i_nop(p
); /* QED specifies 2 nops hazard */
637 panic("No TLB refill handler yet (CPU type: %d)",
638 current_cpu_data
.cputype
);
643 static __cpuinit __maybe_unused
void build_convert_pte_to_entrylo(u32
**p
,
647 UASM_i_ROTR(p
, reg
, reg
, ilog2(_PAGE_GLOBAL
));
649 #ifdef CONFIG_64BIT_PHYS_ADDR
650 uasm_i_dsrl_safe(p
, reg
, reg
, ilog2(_PAGE_GLOBAL
));
652 UASM_i_SRL(p
, reg
, reg
, ilog2(_PAGE_GLOBAL
));
657 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
659 static __cpuinit
void build_restore_pagemask(u32
**p
,
660 struct uasm_reloc
**r
,
665 if (restore_scratch
) {
666 /* Reset default page size */
667 if (PM_DEFAULT_MASK
>> 16) {
668 uasm_i_lui(p
, tmp
, PM_DEFAULT_MASK
>> 16);
669 uasm_i_ori(p
, tmp
, tmp
, PM_DEFAULT_MASK
& 0xffff);
670 uasm_i_mtc0(p
, tmp
, C0_PAGEMASK
);
671 uasm_il_b(p
, r
, lid
);
672 } else if (PM_DEFAULT_MASK
) {
673 uasm_i_ori(p
, tmp
, 0, PM_DEFAULT_MASK
);
674 uasm_i_mtc0(p
, tmp
, C0_PAGEMASK
);
675 uasm_il_b(p
, r
, lid
);
677 uasm_i_mtc0(p
, 0, C0_PAGEMASK
);
678 uasm_il_b(p
, r
, lid
);
681 UASM_i_MFC0(p
, 1, 31, scratch_reg
);
683 UASM_i_LW(p
, 1, scratchpad_offset(0), 0);
685 /* Reset default page size */
686 if (PM_DEFAULT_MASK
>> 16) {
687 uasm_i_lui(p
, tmp
, PM_DEFAULT_MASK
>> 16);
688 uasm_i_ori(p
, tmp
, tmp
, PM_DEFAULT_MASK
& 0xffff);
689 uasm_il_b(p
, r
, lid
);
690 uasm_i_mtc0(p
, tmp
, C0_PAGEMASK
);
691 } else if (PM_DEFAULT_MASK
) {
692 uasm_i_ori(p
, tmp
, 0, PM_DEFAULT_MASK
);
693 uasm_il_b(p
, r
, lid
);
694 uasm_i_mtc0(p
, tmp
, C0_PAGEMASK
);
696 uasm_il_b(p
, r
, lid
);
697 uasm_i_mtc0(p
, 0, C0_PAGEMASK
);
702 static __cpuinit
void build_huge_tlb_write_entry(u32
**p
,
703 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.
722 static void __cpuinit
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 __cpuinit
void build_huge_update_entries(u32
**p
,
742 * A huge PTE describes an area the size of the
743 * configured huge page size. This is twice the
744 * of the large TLB entry size we intend to use.
745 * A TLB entry half the size of the configured
746 * huge page size is configured into entrylo0
747 * and entrylo1 to cover the contiguous huge PTE
750 small_sequence
= (HPAGE_SIZE
>> 7) < 0x10000;
752 /* We can clobber tmp. It isn't used after this.*/
754 uasm_i_lui(p
, tmp
, HPAGE_SIZE
>> (7 + 16));
756 build_convert_pte_to_entrylo(p
, pte
);
757 UASM_i_MTC0(p
, pte
, C0_ENTRYLO0
); /* load it */
758 /* convert to entrylo1 */
760 UASM_i_ADDIU(p
, pte
, pte
, HPAGE_SIZE
>> 7);
762 UASM_i_ADDU(p
, pte
, pte
, tmp
);
764 UASM_i_MTC0(p
, pte
, C0_ENTRYLO1
); /* load it */
767 static __cpuinit
void build_huge_handler_tail(u32
**p
,
768 struct uasm_reloc
**r
,
769 struct uasm_label
**l
,
774 UASM_i_SC(p
, pte
, 0, ptr
);
775 uasm_il_beqz(p
, r
, pte
, label_tlb_huge_update
);
776 UASM_i_LW(p
, pte
, 0, ptr
); /* Needed because SC killed our PTE */
778 UASM_i_SW(p
, pte
, 0, ptr
);
780 build_huge_update_entries(p
, pte
, ptr
);
781 build_huge_tlb_write_entry(p
, l
, r
, pte
, tlb_indexed
, 0);
783 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
787 * TMP and PTR are scratch.
788 * TMP will be clobbered, PTR will hold the pmd entry.
790 static void __cpuinit
791 build_get_pmde64(u32
**p
, struct uasm_label
**l
, struct uasm_reloc
**r
,
792 unsigned int tmp
, unsigned int ptr
)
794 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
795 long pgdc
= (long)pgd_current
;
798 * The vmalloc handling is not in the hotpath.
800 uasm_i_dmfc0(p
, tmp
, C0_BADVADDR
);
802 if (check_for_high_segbits
) {
804 * The kernel currently implicitely assumes that the
805 * MIPS SEGBITS parameter for the processor is
806 * (PGDIR_SHIFT+PGDIR_BITS) or less, and will never
807 * allocate virtual addresses outside the maximum
808 * range for SEGBITS = (PGDIR_SHIFT+PGDIR_BITS). But
809 * that doesn't prevent user code from accessing the
810 * higher xuseg addresses. Here, we make sure that
811 * everything but the lower xuseg addresses goes down
812 * the module_alloc/vmalloc path.
814 uasm_i_dsrl_safe(p
, ptr
, tmp
, PGDIR_SHIFT
+ PGD_ORDER
+ PAGE_SHIFT
- 3);
815 uasm_il_bnez(p
, r
, ptr
, label_vmalloc
);
817 uasm_il_bltz(p
, r
, tmp
, label_vmalloc
);
819 /* No uasm_i_nop needed here, since the next insn doesn't touch TMP. */
821 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
823 /* pgd is in pgd_reg */
824 UASM_i_MFC0(p
, ptr
, 31, pgd_reg
);
827 * &pgd << 11 stored in CONTEXT [23..63].
829 UASM_i_MFC0(p
, ptr
, C0_CONTEXT
);
831 /* Clear lower 23 bits of context. */
832 uasm_i_dins(p
, ptr
, 0, 0, 23);
834 /* 1 0 1 0 1 << 6 xkphys cached */
835 uasm_i_ori(p
, ptr
, ptr
, 0x540);
836 uasm_i_drotr(p
, ptr
, ptr
, 11);
838 #elif defined(CONFIG_SMP)
839 # ifdef CONFIG_MIPS_MT_SMTC
841 * SMTC uses TCBind value as "CPU" index
843 uasm_i_mfc0(p
, ptr
, C0_TCBIND
);
844 uasm_i_dsrl_safe(p
, ptr
, ptr
, 19);
847 * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
850 uasm_i_dmfc0(p
, ptr
, C0_CONTEXT
);
851 uasm_i_dsrl_safe(p
, ptr
, ptr
, 23);
853 UASM_i_LA_mostly(p
, tmp
, pgdc
);
854 uasm_i_daddu(p
, ptr
, ptr
, tmp
);
855 uasm_i_dmfc0(p
, tmp
, C0_BADVADDR
);
856 uasm_i_ld(p
, ptr
, uasm_rel_lo(pgdc
), ptr
);
858 UASM_i_LA_mostly(p
, ptr
, pgdc
);
859 uasm_i_ld(p
, ptr
, uasm_rel_lo(pgdc
), ptr
);
862 uasm_l_vmalloc_done(l
, *p
);
864 /* get pgd offset in bytes */
865 uasm_i_dsrl_safe(p
, tmp
, tmp
, PGDIR_SHIFT
- 3);
867 uasm_i_andi(p
, tmp
, tmp
, (PTRS_PER_PGD
- 1)<<3);
868 uasm_i_daddu(p
, ptr
, ptr
, tmp
); /* add in pgd offset */
869 #ifndef __PAGETABLE_PMD_FOLDED
870 uasm_i_dmfc0(p
, tmp
, C0_BADVADDR
); /* get faulting address */
871 uasm_i_ld(p
, ptr
, 0, ptr
); /* get pmd pointer */
872 uasm_i_dsrl_safe(p
, tmp
, tmp
, PMD_SHIFT
-3); /* get pmd offset in bytes */
873 uasm_i_andi(p
, tmp
, tmp
, (PTRS_PER_PMD
- 1)<<3);
874 uasm_i_daddu(p
, ptr
, ptr
, tmp
); /* add in pmd offset */
879 * BVADDR is the faulting address, PTR is scratch.
880 * PTR will hold the pgd for vmalloc.
882 static void __cpuinit
883 build_get_pgd_vmalloc64(u32
**p
, struct uasm_label
**l
, struct uasm_reloc
**r
,
884 unsigned int bvaddr
, unsigned int ptr
,
885 enum vmalloc64_mode mode
)
887 long swpd
= (long)swapper_pg_dir
;
888 int single_insn_swpd
;
889 int did_vmalloc_branch
= 0;
891 single_insn_swpd
= uasm_in_compat_space_p(swpd
) && !uasm_rel_lo(swpd
);
893 uasm_l_vmalloc(l
, *p
);
895 if (mode
!= not_refill
&& check_for_high_segbits
) {
896 if (single_insn_swpd
) {
897 uasm_il_bltz(p
, r
, bvaddr
, label_vmalloc_done
);
898 uasm_i_lui(p
, ptr
, uasm_rel_hi(swpd
));
899 did_vmalloc_branch
= 1;
902 uasm_il_bgez(p
, r
, bvaddr
, label_large_segbits_fault
);
905 if (!did_vmalloc_branch
) {
906 if (uasm_in_compat_space_p(swpd
) && !uasm_rel_lo(swpd
)) {
907 uasm_il_b(p
, r
, label_vmalloc_done
);
908 uasm_i_lui(p
, ptr
, uasm_rel_hi(swpd
));
910 UASM_i_LA_mostly(p
, ptr
, swpd
);
911 uasm_il_b(p
, r
, label_vmalloc_done
);
912 if (uasm_in_compat_space_p(swpd
))
913 uasm_i_addiu(p
, ptr
, ptr
, uasm_rel_lo(swpd
));
915 uasm_i_daddiu(p
, ptr
, ptr
, uasm_rel_lo(swpd
));
918 if (mode
!= not_refill
&& check_for_high_segbits
) {
919 uasm_l_large_segbits_fault(l
, *p
);
921 * We get here if we are an xsseg address, or if we are
922 * an xuseg address above (PGDIR_SHIFT+PGDIR_BITS) boundary.
924 * Ignoring xsseg (assume disabled so would generate
925 * (address errors?), the only remaining possibility
926 * is the upper xuseg addresses. On processors with
927 * TLB_SEGBITS <= PGDIR_SHIFT+PGDIR_BITS, these
928 * addresses would have taken an address error. We try
929 * to mimic that here by taking a load/istream page
932 UASM_i_LA(p
, ptr
, (unsigned long)tlb_do_page_fault_0
);
935 if (mode
== refill_scratch
) {
937 UASM_i_MFC0(p
, 1, 31, scratch_reg
);
939 UASM_i_LW(p
, 1, scratchpad_offset(0), 0);
946 #else /* !CONFIG_64BIT */
949 * TMP and PTR are scratch.
950 * TMP will be clobbered, PTR will hold the pgd entry.
952 static void __cpuinit __maybe_unused
953 build_get_pgde32(u32
**p
, unsigned int tmp
, unsigned int ptr
)
955 long pgdc
= (long)pgd_current
;
957 /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */
959 #ifdef CONFIG_MIPS_MT_SMTC
961 * SMTC uses TCBind value as "CPU" index
963 uasm_i_mfc0(p
, ptr
, C0_TCBIND
);
964 UASM_i_LA_mostly(p
, tmp
, pgdc
);
965 uasm_i_srl(p
, ptr
, ptr
, 19);
968 * smp_processor_id() << 3 is stored in CONTEXT.
970 uasm_i_mfc0(p
, ptr
, C0_CONTEXT
);
971 UASM_i_LA_mostly(p
, tmp
, pgdc
);
972 uasm_i_srl(p
, ptr
, ptr
, 23);
974 uasm_i_addu(p
, ptr
, tmp
, ptr
);
976 UASM_i_LA_mostly(p
, ptr
, pgdc
);
978 uasm_i_mfc0(p
, tmp
, C0_BADVADDR
); /* get faulting address */
979 uasm_i_lw(p
, ptr
, uasm_rel_lo(pgdc
), ptr
);
980 uasm_i_srl(p
, tmp
, tmp
, PGDIR_SHIFT
); /* get pgd only bits */
981 uasm_i_sll(p
, tmp
, tmp
, PGD_T_LOG2
);
982 uasm_i_addu(p
, ptr
, ptr
, tmp
); /* add in pgd offset */
985 #endif /* !CONFIG_64BIT */
987 static void __cpuinit
build_adjust_context(u32
**p
, unsigned int ctx
)
989 unsigned int shift
= 4 - (PTE_T_LOG2
+ 1) + PAGE_SHIFT
- 12;
990 unsigned int mask
= (PTRS_PER_PTE
/ 2 - 1) << (PTE_T_LOG2
+ 1);
992 switch (current_cpu_type()) {
1009 UASM_i_SRL(p
, ctx
, ctx
, shift
);
1010 uasm_i_andi(p
, ctx
, ctx
, mask
);
1013 static void __cpuinit
build_get_ptep(u32
**p
, unsigned int tmp
, unsigned int ptr
)
1016 * Bug workaround for the Nevada. It seems as if under certain
1017 * circumstances the move from cp0_context might produce a
1018 * bogus result when the mfc0 instruction and its consumer are
1019 * in a different cacheline or a load instruction, probably any
1020 * memory reference, is between them.
1022 switch (current_cpu_type()) {
1024 UASM_i_LW(p
, ptr
, 0, ptr
);
1025 GET_CONTEXT(p
, tmp
); /* get context reg */
1029 GET_CONTEXT(p
, tmp
); /* get context reg */
1030 UASM_i_LW(p
, ptr
, 0, ptr
);
1034 build_adjust_context(p
, tmp
);
1035 UASM_i_ADDU(p
, ptr
, ptr
, tmp
); /* add in offset */
1038 static void __cpuinit
build_update_entries(u32
**p
, unsigned int tmp
,
1042 * 64bit address support (36bit on a 32bit CPU) in a 32bit
1043 * Kernel is a special case. Only a few CPUs use it.
1045 #ifdef CONFIG_64BIT_PHYS_ADDR
1046 if (cpu_has_64bits
) {
1047 uasm_i_ld(p
, tmp
, 0, ptep
); /* get even pte */
1048 uasm_i_ld(p
, ptep
, sizeof(pte_t
), ptep
); /* get odd pte */
1050 UASM_i_ROTR(p
, tmp
, tmp
, ilog2(_PAGE_GLOBAL
));
1051 UASM_i_MTC0(p
, tmp
, C0_ENTRYLO0
); /* load it */
1052 UASM_i_ROTR(p
, ptep
, ptep
, ilog2(_PAGE_GLOBAL
));
1054 uasm_i_dsrl_safe(p
, tmp
, tmp
, ilog2(_PAGE_GLOBAL
)); /* convert to entrylo0 */
1055 UASM_i_MTC0(p
, tmp
, C0_ENTRYLO0
); /* load it */
1056 uasm_i_dsrl_safe(p
, ptep
, ptep
, ilog2(_PAGE_GLOBAL
)); /* convert to entrylo1 */
1058 UASM_i_MTC0(p
, ptep
, C0_ENTRYLO1
); /* load it */
1060 int pte_off_even
= sizeof(pte_t
) / 2;
1061 int pte_off_odd
= pte_off_even
+ sizeof(pte_t
);
1063 /* The pte entries are pre-shifted */
1064 uasm_i_lw(p
, tmp
, pte_off_even
, ptep
); /* get even pte */
1065 UASM_i_MTC0(p
, tmp
, C0_ENTRYLO0
); /* load it */
1066 uasm_i_lw(p
, ptep
, pte_off_odd
, ptep
); /* get odd pte */
1067 UASM_i_MTC0(p
, ptep
, C0_ENTRYLO1
); /* load it */
1070 UASM_i_LW(p
, tmp
, 0, ptep
); /* get even pte */
1071 UASM_i_LW(p
, ptep
, sizeof(pte_t
), ptep
); /* get odd pte */
1072 if (r45k_bvahwbug())
1073 build_tlb_probe_entry(p
);
1075 UASM_i_ROTR(p
, tmp
, tmp
, ilog2(_PAGE_GLOBAL
));
1076 if (r4k_250MHZhwbug())
1077 UASM_i_MTC0(p
, 0, C0_ENTRYLO0
);
1078 UASM_i_MTC0(p
, tmp
, C0_ENTRYLO0
); /* load it */
1079 UASM_i_ROTR(p
, ptep
, ptep
, ilog2(_PAGE_GLOBAL
));
1081 UASM_i_SRL(p
, tmp
, tmp
, ilog2(_PAGE_GLOBAL
)); /* convert to entrylo0 */
1082 if (r4k_250MHZhwbug())
1083 UASM_i_MTC0(p
, 0, C0_ENTRYLO0
);
1084 UASM_i_MTC0(p
, tmp
, C0_ENTRYLO0
); /* load it */
1085 UASM_i_SRL(p
, ptep
, ptep
, ilog2(_PAGE_GLOBAL
)); /* convert to entrylo1 */
1086 if (r45k_bvahwbug())
1087 uasm_i_mfc0(p
, tmp
, C0_INDEX
);
1089 if (r4k_250MHZhwbug())
1090 UASM_i_MTC0(p
, 0, C0_ENTRYLO1
);
1091 UASM_i_MTC0(p
, ptep
, C0_ENTRYLO1
); /* load it */
1095 struct mips_huge_tlb_info
{
1097 int restore_scratch
;
1100 static struct mips_huge_tlb_info __cpuinit
1101 build_fast_tlb_refill_handler (u32
**p
, struct uasm_label
**l
,
1102 struct uasm_reloc
**r
, unsigned int tmp
,
1103 unsigned int ptr
, int c0_scratch
)
1105 struct mips_huge_tlb_info rv
;
1106 unsigned int even
, odd
;
1107 int vmalloc_branch_delay_filled
= 0;
1108 const int scratch
= 1; /* Our extra working register */
1110 rv
.huge_pte
= scratch
;
1111 rv
.restore_scratch
= 0;
1113 if (check_for_high_segbits
) {
1114 UASM_i_MFC0(p
, tmp
, C0_BADVADDR
);
1117 UASM_i_MFC0(p
, ptr
, 31, pgd_reg
);
1119 UASM_i_MFC0(p
, ptr
, C0_CONTEXT
);
1121 if (c0_scratch
>= 0)
1122 UASM_i_MTC0(p
, scratch
, 31, c0_scratch
);
1124 UASM_i_SW(p
, scratch
, scratchpad_offset(0), 0);
1126 uasm_i_dsrl_safe(p
, scratch
, tmp
,
1127 PGDIR_SHIFT
+ PGD_ORDER
+ PAGE_SHIFT
- 3);
1128 uasm_il_bnez(p
, r
, scratch
, label_vmalloc
);
1130 if (pgd_reg
== -1) {
1131 vmalloc_branch_delay_filled
= 1;
1132 /* Clear lower 23 bits of context. */
1133 uasm_i_dins(p
, ptr
, 0, 0, 23);
1137 UASM_i_MFC0(p
, ptr
, 31, pgd_reg
);
1139 UASM_i_MFC0(p
, ptr
, C0_CONTEXT
);
1141 UASM_i_MFC0(p
, tmp
, C0_BADVADDR
);
1143 if (c0_scratch
>= 0)
1144 UASM_i_MTC0(p
, scratch
, 31, c0_scratch
);
1146 UASM_i_SW(p
, scratch
, scratchpad_offset(0), 0);
1149 /* Clear lower 23 bits of context. */
1150 uasm_i_dins(p
, ptr
, 0, 0, 23);
1152 uasm_il_bltz(p
, r
, tmp
, label_vmalloc
);
1155 if (pgd_reg
== -1) {
1156 vmalloc_branch_delay_filled
= 1;
1157 /* 1 0 1 0 1 << 6 xkphys cached */
1158 uasm_i_ori(p
, ptr
, ptr
, 0x540);
1159 uasm_i_drotr(p
, ptr
, ptr
, 11);
1162 #ifdef __PAGETABLE_PMD_FOLDED
1163 #define LOC_PTEP scratch
1165 #define LOC_PTEP ptr
1168 if (!vmalloc_branch_delay_filled
)
1169 /* get pgd offset in bytes */
1170 uasm_i_dsrl_safe(p
, scratch
, tmp
, PGDIR_SHIFT
- 3);
1172 uasm_l_vmalloc_done(l
, *p
);
1176 * fall-through case = badvaddr *pgd_current
1177 * vmalloc case = badvaddr swapper_pg_dir
1180 if (vmalloc_branch_delay_filled
)
1181 /* get pgd offset in bytes */
1182 uasm_i_dsrl_safe(p
, scratch
, tmp
, PGDIR_SHIFT
- 3);
1184 #ifdef __PAGETABLE_PMD_FOLDED
1185 GET_CONTEXT(p
, tmp
); /* get context reg */
1187 uasm_i_andi(p
, scratch
, scratch
, (PTRS_PER_PGD
- 1) << 3);
1189 if (use_lwx_insns()) {
1190 UASM_i_LWX(p
, LOC_PTEP
, scratch
, ptr
);
1192 uasm_i_daddu(p
, ptr
, ptr
, scratch
); /* add in pgd offset */
1193 uasm_i_ld(p
, LOC_PTEP
, 0, ptr
); /* get pmd pointer */
1196 #ifndef __PAGETABLE_PMD_FOLDED
1197 /* get pmd offset in bytes */
1198 uasm_i_dsrl_safe(p
, scratch
, tmp
, PMD_SHIFT
- 3);
1199 uasm_i_andi(p
, scratch
, scratch
, (PTRS_PER_PMD
- 1) << 3);
1200 GET_CONTEXT(p
, tmp
); /* get context reg */
1202 if (use_lwx_insns()) {
1203 UASM_i_LWX(p
, scratch
, scratch
, ptr
);
1205 uasm_i_daddu(p
, ptr
, ptr
, scratch
); /* add in pmd offset */
1206 UASM_i_LW(p
, scratch
, 0, ptr
);
1209 /* Adjust the context during the load latency. */
1210 build_adjust_context(p
, tmp
);
1212 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1213 uasm_il_bbit1(p
, r
, scratch
, ilog2(_PAGE_HUGE
), label_tlb_huge_update
);
1215 * The in the LWX case we don't want to do the load in the
1216 * delay slot. It cannot issue in the same cycle and may be
1217 * speculative and unneeded.
1219 if (use_lwx_insns())
1221 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
1224 /* build_update_entries */
1225 if (use_lwx_insns()) {
1228 UASM_i_LWX(p
, even
, scratch
, tmp
);
1229 UASM_i_ADDIU(p
, tmp
, tmp
, sizeof(pte_t
));
1230 UASM_i_LWX(p
, odd
, scratch
, tmp
);
1232 UASM_i_ADDU(p
, ptr
, scratch
, tmp
); /* add in offset */
1235 UASM_i_LW(p
, even
, 0, ptr
); /* get even pte */
1236 UASM_i_LW(p
, odd
, sizeof(pte_t
), ptr
); /* get odd pte */
1239 uasm_i_drotr(p
, even
, even
, ilog2(_PAGE_GLOBAL
));
1240 UASM_i_MTC0(p
, even
, C0_ENTRYLO0
); /* load it */
1241 uasm_i_drotr(p
, odd
, odd
, ilog2(_PAGE_GLOBAL
));
1243 uasm_i_dsrl_safe(p
, even
, even
, ilog2(_PAGE_GLOBAL
));
1244 UASM_i_MTC0(p
, even
, C0_ENTRYLO0
); /* load it */
1245 uasm_i_dsrl_safe(p
, odd
, odd
, ilog2(_PAGE_GLOBAL
));
1247 UASM_i_MTC0(p
, odd
, C0_ENTRYLO1
); /* load it */
1249 if (c0_scratch
>= 0) {
1250 UASM_i_MFC0(p
, scratch
, 31, c0_scratch
);
1251 build_tlb_write_entry(p
, l
, r
, tlb_random
);
1252 uasm_l_leave(l
, *p
);
1253 rv
.restore_scratch
= 1;
1254 } else if (PAGE_SHIFT
== 14 || PAGE_SHIFT
== 13) {
1255 build_tlb_write_entry(p
, l
, r
, tlb_random
);
1256 uasm_l_leave(l
, *p
);
1257 UASM_i_LW(p
, scratch
, scratchpad_offset(0), 0);
1259 UASM_i_LW(p
, scratch
, scratchpad_offset(0), 0);
1260 build_tlb_write_entry(p
, l
, r
, tlb_random
);
1261 uasm_l_leave(l
, *p
);
1262 rv
.restore_scratch
= 1;
1265 uasm_i_eret(p
); /* return from trap */
1271 * For a 64-bit kernel, we are using the 64-bit XTLB refill exception
1272 * because EXL == 0. If we wrap, we can also use the 32 instruction
1273 * slots before the XTLB refill exception handler which belong to the
1274 * unused TLB refill exception.
1276 #define MIPS64_REFILL_INSNS 32
1278 static void __cpuinit
build_r4000_tlb_refill_handler(void)
1280 u32
*p
= tlb_handler
;
1281 struct uasm_label
*l
= labels
;
1282 struct uasm_reloc
*r
= relocs
;
1284 unsigned int final_len
;
1285 struct mips_huge_tlb_info htlb_info __maybe_unused
;
1286 enum vmalloc64_mode vmalloc_mode __maybe_unused
;
1288 memset(tlb_handler
, 0, sizeof(tlb_handler
));
1289 memset(labels
, 0, sizeof(labels
));
1290 memset(relocs
, 0, sizeof(relocs
));
1291 memset(final_handler
, 0, sizeof(final_handler
));
1293 if ((scratch_reg
> 0 || scratchpad_available()) && use_bbit_insns()) {
1294 htlb_info
= build_fast_tlb_refill_handler(&p
, &l
, &r
, K0
, K1
,
1296 vmalloc_mode
= refill_scratch
;
1298 htlb_info
.huge_pte
= K0
;
1299 htlb_info
.restore_scratch
= 0;
1300 vmalloc_mode
= refill_noscratch
;
1302 * create the plain linear handler
1304 if (bcm1250_m3_war()) {
1305 unsigned int segbits
= 44;
1307 uasm_i_dmfc0(&p
, K0
, C0_BADVADDR
);
1308 uasm_i_dmfc0(&p
, K1
, C0_ENTRYHI
);
1309 uasm_i_xor(&p
, K0
, K0
, K1
);
1310 uasm_i_dsrl_safe(&p
, K1
, K0
, 62);
1311 uasm_i_dsrl_safe(&p
, K0
, K0
, 12 + 1);
1312 uasm_i_dsll_safe(&p
, K0
, K0
, 64 + 12 + 1 - segbits
);
1313 uasm_i_or(&p
, K0
, K0
, K1
);
1314 uasm_il_bnez(&p
, &r
, K0
, label_leave
);
1315 /* No need for uasm_i_nop */
1319 build_get_pmde64(&p
, &l
, &r
, K0
, K1
); /* get pmd in K1 */
1321 build_get_pgde32(&p
, K0
, K1
); /* get pgd in K1 */
1324 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1325 build_is_huge_pte(&p
, &r
, K0
, K1
, label_tlb_huge_update
);
1328 build_get_ptep(&p
, K0
, K1
);
1329 build_update_entries(&p
, K0
, K1
);
1330 build_tlb_write_entry(&p
, &l
, &r
, tlb_random
);
1331 uasm_l_leave(&l
, p
);
1332 uasm_i_eret(&p
); /* return from trap */
1334 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1335 uasm_l_tlb_huge_update(&l
, p
);
1336 build_huge_update_entries(&p
, htlb_info
.huge_pte
, K1
);
1337 build_huge_tlb_write_entry(&p
, &l
, &r
, K0
, tlb_random
,
1338 htlb_info
.restore_scratch
);
1342 build_get_pgd_vmalloc64(&p
, &l
, &r
, K0
, K1
, vmalloc_mode
);
1346 * Overflow check: For the 64bit handler, we need at least one
1347 * free instruction slot for the wrap-around branch. In worst
1348 * case, if the intended insertion point is a delay slot, we
1349 * need three, with the second nop'ed and the third being
1352 /* Loongson2 ebase is different than r4k, we have more space */
1353 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
1354 if ((p
- tlb_handler
) > 64)
1355 panic("TLB refill handler space exceeded");
1357 if (((p
- tlb_handler
) > (MIPS64_REFILL_INSNS
* 2) - 1)
1358 || (((p
- tlb_handler
) > (MIPS64_REFILL_INSNS
* 2) - 3)
1359 && uasm_insn_has_bdelay(relocs
,
1360 tlb_handler
+ MIPS64_REFILL_INSNS
- 3)))
1361 panic("TLB refill handler space exceeded");
1365 * Now fold the handler in the TLB refill handler space.
1367 #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2)
1369 /* Simplest case, just copy the handler. */
1370 uasm_copy_handler(relocs
, labels
, tlb_handler
, p
, f
);
1371 final_len
= p
- tlb_handler
;
1372 #else /* CONFIG_64BIT */
1373 f
= final_handler
+ MIPS64_REFILL_INSNS
;
1374 if ((p
- tlb_handler
) <= MIPS64_REFILL_INSNS
) {
1375 /* Just copy the handler. */
1376 uasm_copy_handler(relocs
, labels
, tlb_handler
, p
, f
);
1377 final_len
= p
- tlb_handler
;
1379 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1380 const enum label_id ls
= label_tlb_huge_update
;
1382 const enum label_id ls
= label_vmalloc
;
1388 for (i
= 0; i
< ARRAY_SIZE(labels
) && labels
[i
].lab
!= ls
; i
++)
1390 BUG_ON(i
== ARRAY_SIZE(labels
));
1391 split
= labels
[i
].addr
;
1394 * See if we have overflown one way or the other.
1396 if (split
> tlb_handler
+ MIPS64_REFILL_INSNS
||
1397 split
< p
- MIPS64_REFILL_INSNS
)
1402 * Split two instructions before the end. One
1403 * for the branch and one for the instruction
1404 * in the delay slot.
1406 split
= tlb_handler
+ MIPS64_REFILL_INSNS
- 2;
1409 * If the branch would fall in a delay slot,
1410 * we must back up an additional instruction
1411 * so that it is no longer in a delay slot.
1413 if (uasm_insn_has_bdelay(relocs
, split
- 1))
1416 /* Copy first part of the handler. */
1417 uasm_copy_handler(relocs
, labels
, tlb_handler
, split
, f
);
1418 f
+= split
- tlb_handler
;
1421 /* Insert branch. */
1422 uasm_l_split(&l
, final_handler
);
1423 uasm_il_b(&f
, &r
, label_split
);
1424 if (uasm_insn_has_bdelay(relocs
, split
))
1427 uasm_copy_handler(relocs
, labels
,
1428 split
, split
+ 1, f
);
1429 uasm_move_labels(labels
, f
, f
+ 1, -1);
1435 /* Copy the rest of the handler. */
1436 uasm_copy_handler(relocs
, labels
, split
, p
, final_handler
);
1437 final_len
= (f
- (final_handler
+ MIPS64_REFILL_INSNS
)) +
1440 #endif /* CONFIG_64BIT */
1442 uasm_resolve_relocs(relocs
, labels
);
1443 pr_debug("Wrote TLB refill handler (%u instructions).\n",
1446 memcpy((void *)ebase
, final_handler
, 0x100);
1448 dump_handler("r4000_tlb_refill", (u32
*)ebase
, 64);
1452 * 128 instructions for the fastpath handler is generous and should
1453 * never be exceeded.
1455 #define FASTPATH_SIZE 128
1457 u32 handle_tlbl
[FASTPATH_SIZE
] __cacheline_aligned
;
1458 u32 handle_tlbs
[FASTPATH_SIZE
] __cacheline_aligned
;
1459 u32 handle_tlbm
[FASTPATH_SIZE
] __cacheline_aligned
;
1460 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
1461 u32 tlbmiss_handler_setup_pgd
[16] __cacheline_aligned
;
1463 static void __cpuinit
build_r4000_setup_pgd(void)
1467 u32
*p
= tlbmiss_handler_setup_pgd
;
1468 struct uasm_label
*l
= labels
;
1469 struct uasm_reloc
*r
= relocs
;
1471 memset(tlbmiss_handler_setup_pgd
, 0, sizeof(tlbmiss_handler_setup_pgd
));
1472 memset(labels
, 0, sizeof(labels
));
1473 memset(relocs
, 0, sizeof(relocs
));
1475 pgd_reg
= allocate_kscratch();
1477 if (pgd_reg
== -1) {
1478 /* PGD << 11 in c0_Context */
1480 * If it is a ckseg0 address, convert to a physical
1481 * address. Shifting right by 29 and adding 4 will
1482 * result in zero for these addresses.
1485 UASM_i_SRA(&p
, a1
, a0
, 29);
1486 UASM_i_ADDIU(&p
, a1
, a1
, 4);
1487 uasm_il_bnez(&p
, &r
, a1
, label_tlbl_goaround1
);
1489 uasm_i_dinsm(&p
, a0
, 0, 29, 64 - 29);
1490 uasm_l_tlbl_goaround1(&l
, p
);
1491 UASM_i_SLL(&p
, a0
, a0
, 11);
1493 UASM_i_MTC0(&p
, a0
, C0_CONTEXT
);
1495 /* PGD in c0_KScratch */
1497 UASM_i_MTC0(&p
, a0
, 31, pgd_reg
);
1499 if (p
- tlbmiss_handler_setup_pgd
> ARRAY_SIZE(tlbmiss_handler_setup_pgd
))
1500 panic("tlbmiss_handler_setup_pgd space exceeded");
1501 uasm_resolve_relocs(relocs
, labels
);
1502 pr_debug("Wrote tlbmiss_handler_setup_pgd (%u instructions).\n",
1503 (unsigned int)(p
- tlbmiss_handler_setup_pgd
));
1505 dump_handler("tlbmiss_handler",
1506 tlbmiss_handler_setup_pgd
,
1507 ARRAY_SIZE(tlbmiss_handler_setup_pgd
));
1511 static void __cpuinit
1512 iPTE_LW(u32
**p
, unsigned int pte
, unsigned int ptr
)
1515 # ifdef CONFIG_64BIT_PHYS_ADDR
1517 uasm_i_lld(p
, pte
, 0, ptr
);
1520 UASM_i_LL(p
, pte
, 0, ptr
);
1522 # ifdef CONFIG_64BIT_PHYS_ADDR
1524 uasm_i_ld(p
, pte
, 0, ptr
);
1527 UASM_i_LW(p
, pte
, 0, ptr
);
1531 static void __cpuinit
1532 iPTE_SW(u32
**p
, struct uasm_reloc
**r
, unsigned int pte
, unsigned int ptr
,
1535 #ifdef CONFIG_64BIT_PHYS_ADDR
1536 unsigned int hwmode
= mode
& (_PAGE_VALID
| _PAGE_DIRTY
);
1539 uasm_i_ori(p
, pte
, pte
, mode
);
1541 # ifdef CONFIG_64BIT_PHYS_ADDR
1543 uasm_i_scd(p
, pte
, 0, ptr
);
1546 UASM_i_SC(p
, pte
, 0, ptr
);
1548 if (r10000_llsc_war())
1549 uasm_il_beqzl(p
, r
, pte
, label_smp_pgtable_change
);
1551 uasm_il_beqz(p
, r
, pte
, label_smp_pgtable_change
);
1553 # ifdef CONFIG_64BIT_PHYS_ADDR
1554 if (!cpu_has_64bits
) {
1555 /* no uasm_i_nop needed */
1556 uasm_i_ll(p
, pte
, sizeof(pte_t
) / 2, ptr
);
1557 uasm_i_ori(p
, pte
, pte
, hwmode
);
1558 uasm_i_sc(p
, pte
, sizeof(pte_t
) / 2, ptr
);
1559 uasm_il_beqz(p
, r
, pte
, label_smp_pgtable_change
);
1560 /* no uasm_i_nop needed */
1561 uasm_i_lw(p
, pte
, 0, ptr
);
1568 # ifdef CONFIG_64BIT_PHYS_ADDR
1570 uasm_i_sd(p
, pte
, 0, ptr
);
1573 UASM_i_SW(p
, pte
, 0, ptr
);
1575 # ifdef CONFIG_64BIT_PHYS_ADDR
1576 if (!cpu_has_64bits
) {
1577 uasm_i_lw(p
, pte
, sizeof(pte_t
) / 2, ptr
);
1578 uasm_i_ori(p
, pte
, pte
, hwmode
);
1579 uasm_i_sw(p
, pte
, sizeof(pte_t
) / 2, ptr
);
1580 uasm_i_lw(p
, pte
, 0, ptr
);
1587 * Check if PTE is present, if not then jump to LABEL. PTR points to
1588 * the page table where this PTE is located, PTE will be re-loaded
1589 * with it's original value.
1591 static void __cpuinit
1592 build_pte_present(u32
**p
, struct uasm_reloc
**r
,
1593 int pte
, int ptr
, int scratch
, enum label_id lid
)
1595 int t
= scratch
>= 0 ? scratch
: pte
;
1598 if (use_bbit_insns()) {
1599 uasm_il_bbit0(p
, r
, pte
, ilog2(_PAGE_PRESENT
), lid
);
1602 uasm_i_andi(p
, t
, pte
, _PAGE_PRESENT
);
1603 uasm_il_beqz(p
, r
, t
, lid
);
1605 /* You lose the SMP race :-(*/
1606 iPTE_LW(p
, pte
, ptr
);
1609 uasm_i_andi(p
, t
, pte
, _PAGE_PRESENT
| _PAGE_READ
);
1610 uasm_i_xori(p
, t
, t
, _PAGE_PRESENT
| _PAGE_READ
);
1611 uasm_il_bnez(p
, r
, t
, lid
);
1613 /* You lose the SMP race :-(*/
1614 iPTE_LW(p
, pte
, ptr
);
1618 /* Make PTE valid, store result in PTR. */
1619 static void __cpuinit
1620 build_make_valid(u32
**p
, struct uasm_reloc
**r
, unsigned int pte
,
1623 unsigned int mode
= _PAGE_VALID
| _PAGE_ACCESSED
;
1625 iPTE_SW(p
, r
, pte
, ptr
, mode
);
1629 * Check if PTE can be written to, if not branch to LABEL. Regardless
1630 * restore PTE with value from PTR when done.
1632 static void __cpuinit
1633 build_pte_writable(u32
**p
, struct uasm_reloc
**r
,
1634 unsigned int pte
, unsigned int ptr
, int scratch
,
1637 int t
= scratch
>= 0 ? scratch
: pte
;
1639 uasm_i_andi(p
, t
, pte
, _PAGE_PRESENT
| _PAGE_WRITE
);
1640 uasm_i_xori(p
, t
, t
, _PAGE_PRESENT
| _PAGE_WRITE
);
1641 uasm_il_bnez(p
, r
, t
, lid
);
1643 /* You lose the SMP race :-(*/
1644 iPTE_LW(p
, pte
, ptr
);
1649 /* Make PTE writable, update software status bits as well, then store
1652 static void __cpuinit
1653 build_make_write(u32
**p
, struct uasm_reloc
**r
, unsigned int pte
,
1656 unsigned int mode
= (_PAGE_ACCESSED
| _PAGE_MODIFIED
| _PAGE_VALID
1659 iPTE_SW(p
, r
, pte
, ptr
, mode
);
1663 * Check if PTE can be modified, if not branch to LABEL. Regardless
1664 * restore PTE with value from PTR when done.
1666 static void __cpuinit
1667 build_pte_modifiable(u32
**p
, struct uasm_reloc
**r
,
1668 unsigned int pte
, unsigned int ptr
, int scratch
,
1671 if (use_bbit_insns()) {
1672 uasm_il_bbit0(p
, r
, pte
, ilog2(_PAGE_WRITE
), lid
);
1675 int t
= scratch
>= 0 ? scratch
: pte
;
1676 uasm_i_andi(p
, t
, pte
, _PAGE_WRITE
);
1677 uasm_il_beqz(p
, r
, t
, lid
);
1679 /* You lose the SMP race :-(*/
1680 iPTE_LW(p
, pte
, ptr
);
1684 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
1688 * R3000 style TLB load/store/modify handlers.
1692 * This places the pte into ENTRYLO0 and writes it with tlbwi.
1695 static void __cpuinit
1696 build_r3000_pte_reload_tlbwi(u32
**p
, unsigned int pte
, unsigned int tmp
)
1698 uasm_i_mtc0(p
, pte
, C0_ENTRYLO0
); /* cp0 delay */
1699 uasm_i_mfc0(p
, tmp
, C0_EPC
); /* cp0 delay */
1702 uasm_i_rfe(p
); /* branch delay */
1706 * This places the pte into ENTRYLO0 and writes it with tlbwi
1707 * or tlbwr as appropriate. This is because the index register
1708 * may have the probe fail bit set as a result of a trap on a
1709 * kseg2 access, i.e. without refill. Then it returns.
1711 static void __cpuinit
1712 build_r3000_tlb_reload_write(u32
**p
, struct uasm_label
**l
,
1713 struct uasm_reloc
**r
, unsigned int pte
,
1716 uasm_i_mfc0(p
, tmp
, C0_INDEX
);
1717 uasm_i_mtc0(p
, pte
, C0_ENTRYLO0
); /* cp0 delay */
1718 uasm_il_bltz(p
, r
, tmp
, label_r3000_write_probe_fail
); /* cp0 delay */
1719 uasm_i_mfc0(p
, tmp
, C0_EPC
); /* branch delay */
1720 uasm_i_tlbwi(p
); /* cp0 delay */
1722 uasm_i_rfe(p
); /* branch delay */
1723 uasm_l_r3000_write_probe_fail(l
, *p
);
1724 uasm_i_tlbwr(p
); /* cp0 delay */
1726 uasm_i_rfe(p
); /* branch delay */
1729 static void __cpuinit
1730 build_r3000_tlbchange_handler_head(u32
**p
, unsigned int pte
,
1733 long pgdc
= (long)pgd_current
;
1735 uasm_i_mfc0(p
, pte
, C0_BADVADDR
);
1736 uasm_i_lui(p
, ptr
, uasm_rel_hi(pgdc
)); /* cp0 delay */
1737 uasm_i_lw(p
, ptr
, uasm_rel_lo(pgdc
), ptr
);
1738 uasm_i_srl(p
, pte
, pte
, 22); /* load delay */
1739 uasm_i_sll(p
, pte
, pte
, 2);
1740 uasm_i_addu(p
, ptr
, ptr
, pte
);
1741 uasm_i_mfc0(p
, pte
, C0_CONTEXT
);
1742 uasm_i_lw(p
, ptr
, 0, ptr
); /* cp0 delay */
1743 uasm_i_andi(p
, pte
, pte
, 0xffc); /* load delay */
1744 uasm_i_addu(p
, ptr
, ptr
, pte
);
1745 uasm_i_lw(p
, pte
, 0, ptr
);
1746 uasm_i_tlbp(p
); /* load delay */
1749 static void __cpuinit
build_r3000_tlb_load_handler(void)
1751 u32
*p
= handle_tlbl
;
1752 struct uasm_label
*l
= labels
;
1753 struct uasm_reloc
*r
= relocs
;
1755 memset(handle_tlbl
, 0, sizeof(handle_tlbl
));
1756 memset(labels
, 0, sizeof(labels
));
1757 memset(relocs
, 0, sizeof(relocs
));
1759 build_r3000_tlbchange_handler_head(&p
, K0
, K1
);
1760 build_pte_present(&p
, &r
, K0
, K1
, -1, label_nopage_tlbl
);
1761 uasm_i_nop(&p
); /* load delay */
1762 build_make_valid(&p
, &r
, K0
, K1
);
1763 build_r3000_tlb_reload_write(&p
, &l
, &r
, K0
, K1
);
1765 uasm_l_nopage_tlbl(&l
, p
);
1766 uasm_i_j(&p
, (unsigned long)tlb_do_page_fault_0
& 0x0fffffff);
1769 if ((p
- handle_tlbl
) > FASTPATH_SIZE
)
1770 panic("TLB load handler fastpath space exceeded");
1772 uasm_resolve_relocs(relocs
, labels
);
1773 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
1774 (unsigned int)(p
- handle_tlbl
));
1776 dump_handler("r3000_tlb_load", handle_tlbl
, ARRAY_SIZE(handle_tlbl
));
1779 static void __cpuinit
build_r3000_tlb_store_handler(void)
1781 u32
*p
= handle_tlbs
;
1782 struct uasm_label
*l
= labels
;
1783 struct uasm_reloc
*r
= relocs
;
1785 memset(handle_tlbs
, 0, sizeof(handle_tlbs
));
1786 memset(labels
, 0, sizeof(labels
));
1787 memset(relocs
, 0, sizeof(relocs
));
1789 build_r3000_tlbchange_handler_head(&p
, K0
, K1
);
1790 build_pte_writable(&p
, &r
, K0
, K1
, -1, label_nopage_tlbs
);
1791 uasm_i_nop(&p
); /* load delay */
1792 build_make_write(&p
, &r
, K0
, K1
);
1793 build_r3000_tlb_reload_write(&p
, &l
, &r
, K0
, K1
);
1795 uasm_l_nopage_tlbs(&l
, p
);
1796 uasm_i_j(&p
, (unsigned long)tlb_do_page_fault_1
& 0x0fffffff);
1799 if ((p
- handle_tlbs
) > FASTPATH_SIZE
)
1800 panic("TLB store handler fastpath space exceeded");
1802 uasm_resolve_relocs(relocs
, labels
);
1803 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
1804 (unsigned int)(p
- handle_tlbs
));
1806 dump_handler("r3000_tlb_store", handle_tlbs
, ARRAY_SIZE(handle_tlbs
));
1809 static void __cpuinit
build_r3000_tlb_modify_handler(void)
1811 u32
*p
= handle_tlbm
;
1812 struct uasm_label
*l
= labels
;
1813 struct uasm_reloc
*r
= relocs
;
1815 memset(handle_tlbm
, 0, sizeof(handle_tlbm
));
1816 memset(labels
, 0, sizeof(labels
));
1817 memset(relocs
, 0, sizeof(relocs
));
1819 build_r3000_tlbchange_handler_head(&p
, K0
, K1
);
1820 build_pte_modifiable(&p
, &r
, K0
, K1
, -1, label_nopage_tlbm
);
1821 uasm_i_nop(&p
); /* load delay */
1822 build_make_write(&p
, &r
, K0
, K1
);
1823 build_r3000_pte_reload_tlbwi(&p
, K0
, K1
);
1825 uasm_l_nopage_tlbm(&l
, p
);
1826 uasm_i_j(&p
, (unsigned long)tlb_do_page_fault_1
& 0x0fffffff);
1829 if ((p
- handle_tlbm
) > FASTPATH_SIZE
)
1830 panic("TLB modify handler fastpath space exceeded");
1832 uasm_resolve_relocs(relocs
, labels
);
1833 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
1834 (unsigned int)(p
- handle_tlbm
));
1836 dump_handler("r3000_tlb_modify", handle_tlbm
, ARRAY_SIZE(handle_tlbm
));
1838 #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */
1841 * R4000 style TLB load/store/modify handlers.
1843 static struct work_registers __cpuinit
1844 build_r4000_tlbchange_handler_head(u32
**p
, struct uasm_label
**l
,
1845 struct uasm_reloc
**r
)
1847 struct work_registers wr
= build_get_work_registers(p
);
1850 build_get_pmde64(p
, l
, r
, wr
.r1
, wr
.r2
); /* get pmd in ptr */
1852 build_get_pgde32(p
, wr
.r1
, wr
.r2
); /* get pgd in ptr */
1855 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1857 * For huge tlb entries, pmd doesn't contain an address but
1858 * instead contains the tlb pte. Check the PAGE_HUGE bit and
1859 * see if we need to jump to huge tlb processing.
1861 build_is_huge_pte(p
, r
, wr
.r1
, wr
.r2
, label_tlb_huge_update
);
1864 UASM_i_MFC0(p
, wr
.r1
, C0_BADVADDR
);
1865 UASM_i_LW(p
, wr
.r2
, 0, wr
.r2
);
1866 UASM_i_SRL(p
, wr
.r1
, wr
.r1
, PAGE_SHIFT
+ PTE_ORDER
- PTE_T_LOG2
);
1867 uasm_i_andi(p
, wr
.r1
, wr
.r1
, (PTRS_PER_PTE
- 1) << PTE_T_LOG2
);
1868 UASM_i_ADDU(p
, wr
.r2
, wr
.r2
, wr
.r1
);
1871 uasm_l_smp_pgtable_change(l
, *p
);
1873 iPTE_LW(p
, wr
.r1
, wr
.r2
); /* get even pte */
1874 if (!m4kc_tlbp_war())
1875 build_tlb_probe_entry(p
);
1879 static void __cpuinit
1880 build_r4000_tlbchange_handler_tail(u32
**p
, struct uasm_label
**l
,
1881 struct uasm_reloc
**r
, unsigned int tmp
,
1884 uasm_i_ori(p
, ptr
, ptr
, sizeof(pte_t
));
1885 uasm_i_xori(p
, ptr
, ptr
, sizeof(pte_t
));
1886 build_update_entries(p
, tmp
, ptr
);
1887 build_tlb_write_entry(p
, l
, r
, tlb_indexed
);
1888 uasm_l_leave(l
, *p
);
1889 build_restore_work_registers(p
);
1890 uasm_i_eret(p
); /* return from trap */
1893 build_get_pgd_vmalloc64(p
, l
, r
, tmp
, ptr
, not_refill
);
1897 static void __cpuinit
build_r4000_tlb_load_handler(void)
1899 u32
*p
= handle_tlbl
;
1900 struct uasm_label
*l
= labels
;
1901 struct uasm_reloc
*r
= relocs
;
1902 struct work_registers wr
;
1904 memset(handle_tlbl
, 0, sizeof(handle_tlbl
));
1905 memset(labels
, 0, sizeof(labels
));
1906 memset(relocs
, 0, sizeof(relocs
));
1908 if (bcm1250_m3_war()) {
1909 unsigned int segbits
= 44;
1911 uasm_i_dmfc0(&p
, K0
, C0_BADVADDR
);
1912 uasm_i_dmfc0(&p
, K1
, C0_ENTRYHI
);
1913 uasm_i_xor(&p
, K0
, K0
, K1
);
1914 uasm_i_dsrl_safe(&p
, K1
, K0
, 62);
1915 uasm_i_dsrl_safe(&p
, K0
, K0
, 12 + 1);
1916 uasm_i_dsll_safe(&p
, K0
, K0
, 64 + 12 + 1 - segbits
);
1917 uasm_i_or(&p
, K0
, K0
, K1
);
1918 uasm_il_bnez(&p
, &r
, K0
, label_leave
);
1919 /* No need for uasm_i_nop */
1922 wr
= build_r4000_tlbchange_handler_head(&p
, &l
, &r
);
1923 build_pte_present(&p
, &r
, wr
.r1
, wr
.r2
, wr
.r3
, label_nopage_tlbl
);
1924 if (m4kc_tlbp_war())
1925 build_tlb_probe_entry(&p
);
1929 * If the page is not _PAGE_VALID, RI or XI could not
1930 * have triggered it. Skip the expensive test..
1932 if (use_bbit_insns()) {
1933 uasm_il_bbit0(&p
, &r
, wr
.r1
, ilog2(_PAGE_VALID
),
1934 label_tlbl_goaround1
);
1936 uasm_i_andi(&p
, wr
.r3
, wr
.r1
, _PAGE_VALID
);
1937 uasm_il_beqz(&p
, &r
, wr
.r3
, label_tlbl_goaround1
);
1942 /* Examine entrylo 0 or 1 based on ptr. */
1943 if (use_bbit_insns()) {
1944 uasm_i_bbit0(&p
, wr
.r2
, ilog2(sizeof(pte_t
)), 8);
1946 uasm_i_andi(&p
, wr
.r3
, wr
.r2
, sizeof(pte_t
));
1947 uasm_i_beqz(&p
, wr
.r3
, 8);
1949 /* load it in the delay slot*/
1950 UASM_i_MFC0(&p
, wr
.r3
, C0_ENTRYLO0
);
1951 /* load it if ptr is odd */
1952 UASM_i_MFC0(&p
, wr
.r3
, C0_ENTRYLO1
);
1954 * If the entryLo (now in wr.r3) is valid (bit 1), RI or
1955 * XI must have triggered it.
1957 if (use_bbit_insns()) {
1958 uasm_il_bbit1(&p
, &r
, wr
.r3
, 1, label_nopage_tlbl
);
1960 uasm_l_tlbl_goaround1(&l
, p
);
1962 uasm_i_andi(&p
, wr
.r3
, wr
.r3
, 2);
1963 uasm_il_bnez(&p
, &r
, wr
.r3
, label_nopage_tlbl
);
1966 uasm_l_tlbl_goaround1(&l
, p
);
1968 build_make_valid(&p
, &r
, wr
.r1
, wr
.r2
);
1969 build_r4000_tlbchange_handler_tail(&p
, &l
, &r
, wr
.r1
, wr
.r2
);
1971 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
1973 * This is the entry point when build_r4000_tlbchange_handler_head
1974 * spots a huge page.
1976 uasm_l_tlb_huge_update(&l
, p
);
1977 iPTE_LW(&p
, wr
.r1
, wr
.r2
);
1978 build_pte_present(&p
, &r
, wr
.r1
, wr
.r2
, wr
.r3
, label_nopage_tlbl
);
1979 build_tlb_probe_entry(&p
);
1983 * If the page is not _PAGE_VALID, RI or XI could not
1984 * have triggered it. Skip the expensive test..
1986 if (use_bbit_insns()) {
1987 uasm_il_bbit0(&p
, &r
, wr
.r1
, ilog2(_PAGE_VALID
),
1988 label_tlbl_goaround2
);
1990 uasm_i_andi(&p
, wr
.r3
, wr
.r1
, _PAGE_VALID
);
1991 uasm_il_beqz(&p
, &r
, wr
.r3
, label_tlbl_goaround2
);
1996 /* Examine entrylo 0 or 1 based on ptr. */
1997 if (use_bbit_insns()) {
1998 uasm_i_bbit0(&p
, wr
.r2
, ilog2(sizeof(pte_t
)), 8);
2000 uasm_i_andi(&p
, wr
.r3
, wr
.r2
, sizeof(pte_t
));
2001 uasm_i_beqz(&p
, wr
.r3
, 8);
2003 /* load it in the delay slot*/
2004 UASM_i_MFC0(&p
, wr
.r3
, C0_ENTRYLO0
);
2005 /* load it if ptr is odd */
2006 UASM_i_MFC0(&p
, wr
.r3
, C0_ENTRYLO1
);
2008 * If the entryLo (now in wr.r3) is valid (bit 1), RI or
2009 * XI must have triggered it.
2011 if (use_bbit_insns()) {
2012 uasm_il_bbit0(&p
, &r
, wr
.r3
, 1, label_tlbl_goaround2
);
2014 uasm_i_andi(&p
, wr
.r3
, wr
.r3
, 2);
2015 uasm_il_beqz(&p
, &r
, wr
.r3
, label_tlbl_goaround2
);
2017 if (PM_DEFAULT_MASK
== 0)
2020 * We clobbered C0_PAGEMASK, restore it. On the other branch
2021 * it is restored in build_huge_tlb_write_entry.
2023 build_restore_pagemask(&p
, &r
, wr
.r3
, label_nopage_tlbl
, 0);
2025 uasm_l_tlbl_goaround2(&l
, p
);
2027 uasm_i_ori(&p
, wr
.r1
, wr
.r1
, (_PAGE_ACCESSED
| _PAGE_VALID
));
2028 build_huge_handler_tail(&p
, &r
, &l
, wr
.r1
, wr
.r2
);
2031 uasm_l_nopage_tlbl(&l
, p
);
2032 build_restore_work_registers(&p
);
2033 uasm_i_j(&p
, (unsigned long)tlb_do_page_fault_0
& 0x0fffffff);
2036 if ((p
- handle_tlbl
) > FASTPATH_SIZE
)
2037 panic("TLB load handler fastpath space exceeded");
2039 uasm_resolve_relocs(relocs
, labels
);
2040 pr_debug("Wrote TLB load handler fastpath (%u instructions).\n",
2041 (unsigned int)(p
- handle_tlbl
));
2043 dump_handler("r4000_tlb_load", handle_tlbl
, ARRAY_SIZE(handle_tlbl
));
2046 static void __cpuinit
build_r4000_tlb_store_handler(void)
2048 u32
*p
= handle_tlbs
;
2049 struct uasm_label
*l
= labels
;
2050 struct uasm_reloc
*r
= relocs
;
2051 struct work_registers wr
;
2053 memset(handle_tlbs
, 0, sizeof(handle_tlbs
));
2054 memset(labels
, 0, sizeof(labels
));
2055 memset(relocs
, 0, sizeof(relocs
));
2057 wr
= build_r4000_tlbchange_handler_head(&p
, &l
, &r
);
2058 build_pte_writable(&p
, &r
, wr
.r1
, wr
.r2
, wr
.r3
, label_nopage_tlbs
);
2059 if (m4kc_tlbp_war())
2060 build_tlb_probe_entry(&p
);
2061 build_make_write(&p
, &r
, wr
.r1
, wr
.r2
);
2062 build_r4000_tlbchange_handler_tail(&p
, &l
, &r
, wr
.r1
, wr
.r2
);
2064 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
2066 * This is the entry point when
2067 * build_r4000_tlbchange_handler_head spots a huge page.
2069 uasm_l_tlb_huge_update(&l
, p
);
2070 iPTE_LW(&p
, wr
.r1
, wr
.r2
);
2071 build_pte_writable(&p
, &r
, wr
.r1
, wr
.r2
, wr
.r3
, label_nopage_tlbs
);
2072 build_tlb_probe_entry(&p
);
2073 uasm_i_ori(&p
, wr
.r1
, wr
.r1
,
2074 _PAGE_ACCESSED
| _PAGE_MODIFIED
| _PAGE_VALID
| _PAGE_DIRTY
);
2075 build_huge_handler_tail(&p
, &r
, &l
, wr
.r1
, wr
.r2
);
2078 uasm_l_nopage_tlbs(&l
, p
);
2079 build_restore_work_registers(&p
);
2080 uasm_i_j(&p
, (unsigned long)tlb_do_page_fault_1
& 0x0fffffff);
2083 if ((p
- handle_tlbs
) > FASTPATH_SIZE
)
2084 panic("TLB store handler fastpath space exceeded");
2086 uasm_resolve_relocs(relocs
, labels
);
2087 pr_debug("Wrote TLB store handler fastpath (%u instructions).\n",
2088 (unsigned int)(p
- handle_tlbs
));
2090 dump_handler("r4000_tlb_store", handle_tlbs
, ARRAY_SIZE(handle_tlbs
));
2093 static void __cpuinit
build_r4000_tlb_modify_handler(void)
2095 u32
*p
= handle_tlbm
;
2096 struct uasm_label
*l
= labels
;
2097 struct uasm_reloc
*r
= relocs
;
2098 struct work_registers wr
;
2100 memset(handle_tlbm
, 0, sizeof(handle_tlbm
));
2101 memset(labels
, 0, sizeof(labels
));
2102 memset(relocs
, 0, sizeof(relocs
));
2104 wr
= build_r4000_tlbchange_handler_head(&p
, &l
, &r
);
2105 build_pte_modifiable(&p
, &r
, wr
.r1
, wr
.r2
, wr
.r3
, label_nopage_tlbm
);
2106 if (m4kc_tlbp_war())
2107 build_tlb_probe_entry(&p
);
2108 /* Present and writable bits set, set accessed and dirty bits. */
2109 build_make_write(&p
, &r
, wr
.r1
, wr
.r2
);
2110 build_r4000_tlbchange_handler_tail(&p
, &l
, &r
, wr
.r1
, wr
.r2
);
2112 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
2114 * This is the entry point when
2115 * build_r4000_tlbchange_handler_head spots a huge page.
2117 uasm_l_tlb_huge_update(&l
, p
);
2118 iPTE_LW(&p
, wr
.r1
, wr
.r2
);
2119 build_pte_modifiable(&p
, &r
, wr
.r1
, wr
.r2
, wr
.r3
, label_nopage_tlbm
);
2120 build_tlb_probe_entry(&p
);
2121 uasm_i_ori(&p
, wr
.r1
, wr
.r1
,
2122 _PAGE_ACCESSED
| _PAGE_MODIFIED
| _PAGE_VALID
| _PAGE_DIRTY
);
2123 build_huge_handler_tail(&p
, &r
, &l
, wr
.r1
, wr
.r2
);
2126 uasm_l_nopage_tlbm(&l
, p
);
2127 build_restore_work_registers(&p
);
2128 uasm_i_j(&p
, (unsigned long)tlb_do_page_fault_1
& 0x0fffffff);
2131 if ((p
- handle_tlbm
) > FASTPATH_SIZE
)
2132 panic("TLB modify handler fastpath space exceeded");
2134 uasm_resolve_relocs(relocs
, labels
);
2135 pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n",
2136 (unsigned int)(p
- handle_tlbm
));
2138 dump_handler("r4000_tlb_modify", handle_tlbm
, ARRAY_SIZE(handle_tlbm
));
2141 void __cpuinit
build_tlb_refill_handler(void)
2144 * The refill handler is generated per-CPU, multi-node systems
2145 * may have local storage for it. The other handlers are only
2148 static int run_once
= 0;
2150 output_pgtable_bits_defines();
2153 check_for_high_segbits
= current_cpu_data
.vmbits
> (PGDIR_SHIFT
+ PGD_ORDER
+ PAGE_SHIFT
- 3);
2156 switch (current_cpu_type()) {
2164 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
2165 build_r3000_tlb_refill_handler();
2167 build_r3000_tlb_load_handler();
2168 build_r3000_tlb_store_handler();
2169 build_r3000_tlb_modify_handler();
2173 panic("No R3000 TLB refill handler");
2179 panic("No R6000 TLB refill handler yet");
2183 panic("No R8000 TLB refill handler yet");
2188 scratch_reg
= allocate_kscratch();
2189 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
2190 build_r4000_setup_pgd();
2192 build_r4000_tlb_load_handler();
2193 build_r4000_tlb_store_handler();
2194 build_r4000_tlb_modify_handler();
2197 build_r4000_tlb_refill_handler();
2201 void __cpuinit
flush_tlb_handlers(void)
2203 local_flush_icache_range((unsigned long)handle_tlbl
,
2204 (unsigned long)handle_tlbl
+ sizeof(handle_tlbl
));
2205 local_flush_icache_range((unsigned long)handle_tlbs
,
2206 (unsigned long)handle_tlbs
+ sizeof(handle_tlbs
));
2207 local_flush_icache_range((unsigned long)handle_tlbm
,
2208 (unsigned long)handle_tlbm
+ sizeof(handle_tlbm
));
2209 #ifdef CONFIG_MIPS_PGD_C0_CONTEXT
2210 local_flush_icache_range((unsigned long)tlbmiss_handler_setup_pgd
,
2211 (unsigned long)tlbmiss_handler_setup_pgd
+ sizeof(handle_tlbm
));