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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
4 * for more details.
5 *
6 * Synthesize TLB refill handlers at runtime.
7 *
8 * Copyright (C) 2004,2005 by Thiemo Seufer
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00009 * Copyright (C) 2005 Maciej W. Rozycki
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
12#include <stdarg.h>
13
14#include <linux/config.h>
15#include <linux/mm.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/string.h>
19#include <linux/init.h>
20
21#include <asm/pgtable.h>
22#include <asm/cacheflush.h>
23#include <asm/mmu_context.h>
24#include <asm/inst.h>
25#include <asm/elf.h>
26#include <asm/smp.h>
27#include <asm/war.h>
28
29/* #define DEBUG_TLB */
30
31static __init int __attribute__((unused)) r45k_bvahwbug(void)
32{
33 /* XXX: We should probe for the presence of this bug, but we don't. */
34 return 0;
35}
36
37static __init int __attribute__((unused)) r4k_250MHZhwbug(void)
38{
39 /* XXX: We should probe for the presence of this bug, but we don't. */
40 return 0;
41}
42
43static __init int __attribute__((unused)) bcm1250_m3_war(void)
44{
45 return BCM1250_M3_WAR;
46}
47
48static __init int __attribute__((unused)) r10000_llsc_war(void)
49{
50 return R10000_LLSC_WAR;
51}
52
53/*
54 * A little micro-assembler, intended for TLB refill handler
55 * synthesizing. It is intentionally kept simple, does only support
56 * a subset of instructions, and does not try to hide pipeline effects
57 * like branch delay slots.
58 */
59
60enum fields
61{
62 RS = 0x001,
63 RT = 0x002,
64 RD = 0x004,
65 RE = 0x008,
66 SIMM = 0x010,
67 UIMM = 0x020,
68 BIMM = 0x040,
69 JIMM = 0x080,
70 FUNC = 0x100,
71};
72
73#define OP_MASK 0x2f
74#define OP_SH 26
75#define RS_MASK 0x1f
76#define RS_SH 21
77#define RT_MASK 0x1f
78#define RT_SH 16
79#define RD_MASK 0x1f
80#define RD_SH 11
81#define RE_MASK 0x1f
82#define RE_SH 6
83#define IMM_MASK 0xffff
84#define IMM_SH 0
85#define JIMM_MASK 0x3ffffff
86#define JIMM_SH 0
87#define FUNC_MASK 0x2f
88#define FUNC_SH 0
89
90enum opcode {
91 insn_invalid,
92 insn_addu, insn_addiu, insn_and, insn_andi, insn_beq,
93 insn_beql, insn_bgez, insn_bgezl, insn_bltz, insn_bltzl,
94 insn_bne, insn_daddu, insn_daddiu, insn_dmfc0, insn_dmtc0,
Thiemo Seufer1b3a6e92005-04-01 14:07:13 +000095 insn_dsll, insn_dsll32, insn_dsra, insn_dsrl,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 insn_dsubu, insn_eret, insn_j, insn_jal, insn_jr, insn_ld,
97 insn_ll, insn_lld, insn_lui, insn_lw, insn_mfc0, insn_mtc0,
98 insn_ori, insn_rfe, insn_sc, insn_scd, insn_sd, insn_sll,
99 insn_sra, insn_srl, insn_subu, insn_sw, insn_tlbp, insn_tlbwi,
100 insn_tlbwr, insn_xor, insn_xori
101};
102
103struct insn {
104 enum opcode opcode;
105 u32 match;
106 enum fields fields;
107};
108
109/* This macro sets the non-variable bits of an instruction. */
110#define M(a, b, c, d, e, f) \
111 ((a) << OP_SH \
112 | (b) << RS_SH \
113 | (c) << RT_SH \
114 | (d) << RD_SH \
115 | (e) << RE_SH \
116 | (f) << FUNC_SH)
117
118static __initdata struct insn insn_table[] = {
119 { insn_addiu, M(addiu_op,0,0,0,0,0), RS | RT | SIMM },
120 { insn_addu, M(spec_op,0,0,0,0,addu_op), RS | RT | RD },
121 { insn_and, M(spec_op,0,0,0,0,and_op), RS | RT | RD },
122 { insn_andi, M(andi_op,0,0,0,0,0), RS | RT | UIMM },
123 { insn_beq, M(beq_op,0,0,0,0,0), RS | RT | BIMM },
124 { insn_beql, M(beql_op,0,0,0,0,0), RS | RT | BIMM },
125 { insn_bgez, M(bcond_op,0,bgez_op,0,0,0), RS | BIMM },
126 { insn_bgezl, M(bcond_op,0,bgezl_op,0,0,0), RS | BIMM },
127 { insn_bltz, M(bcond_op,0,bltz_op,0,0,0), RS | BIMM },
128 { insn_bltzl, M(bcond_op,0,bltzl_op,0,0,0), RS | BIMM },
129 { insn_bne, M(bne_op,0,0,0,0,0), RS | RT | BIMM },
130 { insn_daddiu, M(daddiu_op,0,0,0,0,0), RS | RT | SIMM },
131 { insn_daddu, M(spec_op,0,0,0,0,daddu_op), RS | RT | RD },
132 { insn_dmfc0, M(cop0_op,dmfc_op,0,0,0,0), RT | RD },
133 { insn_dmtc0, M(cop0_op,dmtc_op,0,0,0,0), RT | RD },
134 { insn_dsll, M(spec_op,0,0,0,0,dsll_op), RT | RD | RE },
135 { insn_dsll32, M(spec_op,0,0,0,0,dsll32_op), RT | RD | RE },
136 { insn_dsra, M(spec_op,0,0,0,0,dsra_op), RT | RD | RE },
137 { insn_dsrl, M(spec_op,0,0,0,0,dsrl_op), RT | RD | RE },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 { insn_dsubu, M(spec_op,0,0,0,0,dsubu_op), RS | RT | RD },
139 { insn_eret, M(cop0_op,cop_op,0,0,0,eret_op), 0 },
140 { insn_j, M(j_op,0,0,0,0,0), JIMM },
141 { insn_jal, M(jal_op,0,0,0,0,0), JIMM },
142 { insn_jr, M(spec_op,0,0,0,0,jr_op), RS },
143 { insn_ld, M(ld_op,0,0,0,0,0), RS | RT | SIMM },
144 { insn_ll, M(ll_op,0,0,0,0,0), RS | RT | SIMM },
145 { insn_lld, M(lld_op,0,0,0,0,0), RS | RT | SIMM },
146 { insn_lui, M(lui_op,0,0,0,0,0), RT | SIMM },
147 { insn_lw, M(lw_op,0,0,0,0,0), RS | RT | SIMM },
148 { insn_mfc0, M(cop0_op,mfc_op,0,0,0,0), RT | RD },
149 { insn_mtc0, M(cop0_op,mtc_op,0,0,0,0), RT | RD },
150 { insn_ori, M(ori_op,0,0,0,0,0), RS | RT | UIMM },
151 { insn_rfe, M(cop0_op,cop_op,0,0,0,rfe_op), 0 },
152 { insn_sc, M(sc_op,0,0,0,0,0), RS | RT | SIMM },
153 { insn_scd, M(scd_op,0,0,0,0,0), RS | RT | SIMM },
154 { insn_sd, M(sd_op,0,0,0,0,0), RS | RT | SIMM },
155 { insn_sll, M(spec_op,0,0,0,0,sll_op), RT | RD | RE },
156 { insn_sra, M(spec_op,0,0,0,0,sra_op), RT | RD | RE },
157 { insn_srl, M(spec_op,0,0,0,0,srl_op), RT | RD | RE },
158 { insn_subu, M(spec_op,0,0,0,0,subu_op), RS | RT | RD },
159 { insn_sw, M(sw_op,0,0,0,0,0), RS | RT | SIMM },
160 { insn_tlbp, M(cop0_op,cop_op,0,0,0,tlbp_op), 0 },
161 { insn_tlbwi, M(cop0_op,cop_op,0,0,0,tlbwi_op), 0 },
162 { insn_tlbwr, M(cop0_op,cop_op,0,0,0,tlbwr_op), 0 },
163 { insn_xor, M(spec_op,0,0,0,0,xor_op), RS | RT | RD },
164 { insn_xori, M(xori_op,0,0,0,0,0), RS | RT | UIMM },
165 { insn_invalid, 0, 0 }
166};
167
168#undef M
169
170static __init u32 build_rs(u32 arg)
171{
172 if (arg & ~RS_MASK)
173 printk(KERN_WARNING "TLB synthesizer field overflow\n");
174
175 return (arg & RS_MASK) << RS_SH;
176}
177
178static __init u32 build_rt(u32 arg)
179{
180 if (arg & ~RT_MASK)
181 printk(KERN_WARNING "TLB synthesizer field overflow\n");
182
183 return (arg & RT_MASK) << RT_SH;
184}
185
186static __init u32 build_rd(u32 arg)
187{
188 if (arg & ~RD_MASK)
189 printk(KERN_WARNING "TLB synthesizer field overflow\n");
190
191 return (arg & RD_MASK) << RD_SH;
192}
193
194static __init u32 build_re(u32 arg)
195{
196 if (arg & ~RE_MASK)
197 printk(KERN_WARNING "TLB synthesizer field overflow\n");
198
199 return (arg & RE_MASK) << RE_SH;
200}
201
202static __init u32 build_simm(s32 arg)
203{
204 if (arg > 0x7fff || arg < -0x8000)
205 printk(KERN_WARNING "TLB synthesizer field overflow\n");
206
207 return arg & 0xffff;
208}
209
210static __init u32 build_uimm(u32 arg)
211{
212 if (arg & ~IMM_MASK)
213 printk(KERN_WARNING "TLB synthesizer field overflow\n");
214
215 return arg & IMM_MASK;
216}
217
218static __init u32 build_bimm(s32 arg)
219{
220 if (arg > 0x1ffff || arg < -0x20000)
221 printk(KERN_WARNING "TLB synthesizer field overflow\n");
222
223 if (arg & 0x3)
224 printk(KERN_WARNING "Invalid TLB synthesizer branch target\n");
225
226 return ((arg < 0) ? (1 << 15) : 0) | ((arg >> 2) & 0x7fff);
227}
228
229static __init u32 build_jimm(u32 arg)
230{
231 if (arg & ~((JIMM_MASK) << 2))
232 printk(KERN_WARNING "TLB synthesizer field overflow\n");
233
234 return (arg >> 2) & JIMM_MASK;
235}
236
237static __init u32 build_func(u32 arg)
238{
239 if (arg & ~FUNC_MASK)
240 printk(KERN_WARNING "TLB synthesizer field overflow\n");
241
242 return arg & FUNC_MASK;
243}
244
245/*
246 * The order of opcode arguments is implicitly left to right,
247 * starting with RS and ending with FUNC or IMM.
248 */
249static void __init build_insn(u32 **buf, enum opcode opc, ...)
250{
251 struct insn *ip = NULL;
252 unsigned int i;
253 va_list ap;
254 u32 op;
255
256 for (i = 0; insn_table[i].opcode != insn_invalid; i++)
257 if (insn_table[i].opcode == opc) {
258 ip = &insn_table[i];
259 break;
260 }
261
262 if (!ip)
263 panic("Unsupported TLB synthesizer instruction %d", opc);
264
265 op = ip->match;
266 va_start(ap, opc);
267 if (ip->fields & RS) op |= build_rs(va_arg(ap, u32));
268 if (ip->fields & RT) op |= build_rt(va_arg(ap, u32));
269 if (ip->fields & RD) op |= build_rd(va_arg(ap, u32));
270 if (ip->fields & RE) op |= build_re(va_arg(ap, u32));
271 if (ip->fields & SIMM) op |= build_simm(va_arg(ap, s32));
272 if (ip->fields & UIMM) op |= build_uimm(va_arg(ap, u32));
273 if (ip->fields & BIMM) op |= build_bimm(va_arg(ap, s32));
274 if (ip->fields & JIMM) op |= build_jimm(va_arg(ap, u32));
275 if (ip->fields & FUNC) op |= build_func(va_arg(ap, u32));
276 va_end(ap);
277
278 **buf = op;
279 (*buf)++;
280}
281
282#define I_u1u2u3(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000283 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 unsigned int b, unsigned int c) \
285 { \
286 build_insn(buf, insn##op, a, b, c); \
287 }
288
289#define I_u2u1u3(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000290 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 unsigned int b, unsigned int c) \
292 { \
293 build_insn(buf, insn##op, b, a, c); \
294 }
295
296#define I_u3u1u2(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000297 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 unsigned int b, unsigned int c) \
299 { \
300 build_insn(buf, insn##op, b, c, a); \
301 }
302
303#define I_u1u2s3(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000304 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 unsigned int b, signed int c) \
306 { \
307 build_insn(buf, insn##op, a, b, c); \
308 }
309
310#define I_u2s3u1(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000311 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 signed int b, unsigned int c) \
313 { \
314 build_insn(buf, insn##op, c, a, b); \
315 }
316
317#define I_u2u1s3(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000318 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 unsigned int b, signed int c) \
320 { \
321 build_insn(buf, insn##op, b, a, c); \
322 }
323
324#define I_u1u2(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000325 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 unsigned int b) \
327 { \
328 build_insn(buf, insn##op, a, b); \
329 }
330
331#define I_u1s2(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000332 static inline void __init i##op(u32 **buf, unsigned int a, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 signed int b) \
334 { \
335 build_insn(buf, insn##op, a, b); \
336 }
337
338#define I_u1(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000339 static inline void __init i##op(u32 **buf, unsigned int a) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 { \
341 build_insn(buf, insn##op, a); \
342 }
343
344#define I_0(op) \
Ralf Baechle1443e482006-03-08 15:37:26 +0000345 static inline void __init i##op(u32 **buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 { \
347 build_insn(buf, insn##op); \
348 }
349
350I_u2u1s3(_addiu);
351I_u3u1u2(_addu);
352I_u2u1u3(_andi);
353I_u3u1u2(_and);
354I_u1u2s3(_beq);
355I_u1u2s3(_beql);
356I_u1s2(_bgez);
357I_u1s2(_bgezl);
358I_u1s2(_bltz);
359I_u1s2(_bltzl);
360I_u1u2s3(_bne);
361I_u1u2(_dmfc0);
362I_u1u2(_dmtc0);
363I_u2u1s3(_daddiu);
364I_u3u1u2(_daddu);
365I_u2u1u3(_dsll);
366I_u2u1u3(_dsll32);
367I_u2u1u3(_dsra);
368I_u2u1u3(_dsrl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369I_u3u1u2(_dsubu);
370I_0(_eret);
371I_u1(_j);
372I_u1(_jal);
373I_u1(_jr);
374I_u2s3u1(_ld);
375I_u2s3u1(_ll);
376I_u2s3u1(_lld);
377I_u1s2(_lui);
378I_u2s3u1(_lw);
379I_u1u2(_mfc0);
380I_u1u2(_mtc0);
381I_u2u1u3(_ori);
382I_0(_rfe);
383I_u2s3u1(_sc);
384I_u2s3u1(_scd);
385I_u2s3u1(_sd);
386I_u2u1u3(_sll);
387I_u2u1u3(_sra);
388I_u2u1u3(_srl);
389I_u3u1u2(_subu);
390I_u2s3u1(_sw);
391I_0(_tlbp);
392I_0(_tlbwi);
393I_0(_tlbwr);
394I_u3u1u2(_xor)
395I_u2u1u3(_xori);
396
397/*
398 * handling labels
399 */
400
401enum label_id {
402 label_invalid,
403 label_second_part,
404 label_leave,
405 label_vmalloc,
406 label_vmalloc_done,
407 label_tlbw_hazard,
408 label_split,
409 label_nopage_tlbl,
410 label_nopage_tlbs,
411 label_nopage_tlbm,
412 label_smp_pgtable_change,
413 label_r3000_write_probe_fail,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414};
415
416struct label {
417 u32 *addr;
418 enum label_id lab;
419};
420
421static __init void build_label(struct label **lab, u32 *addr,
422 enum label_id l)
423{
424 (*lab)->addr = addr;
425 (*lab)->lab = l;
426 (*lab)++;
427}
428
429#define L_LA(lb) \
430 static inline void l##lb(struct label **lab, u32 *addr) \
431 { \
432 build_label(lab, addr, label##lb); \
433 }
434
435L_LA(_second_part)
436L_LA(_leave)
437L_LA(_vmalloc)
438L_LA(_vmalloc_done)
439L_LA(_tlbw_hazard)
440L_LA(_split)
441L_LA(_nopage_tlbl)
442L_LA(_nopage_tlbs)
443L_LA(_nopage_tlbm)
444L_LA(_smp_pgtable_change)
445L_LA(_r3000_write_probe_fail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447/* convenience macros for instructions */
Ralf Baechle875d43e2005-09-03 15:56:16 -0700448#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449# define i_LW(buf, rs, rt, off) i_ld(buf, rs, rt, off)
450# define i_SW(buf, rs, rt, off) i_sd(buf, rs, rt, off)
451# define i_SLL(buf, rs, rt, sh) i_dsll(buf, rs, rt, sh)
452# define i_SRA(buf, rs, rt, sh) i_dsra(buf, rs, rt, sh)
453# define i_SRL(buf, rs, rt, sh) i_dsrl(buf, rs, rt, sh)
454# define i_MFC0(buf, rt, rd) i_dmfc0(buf, rt, rd)
455# define i_MTC0(buf, rt, rd) i_dmtc0(buf, rt, rd)
456# define i_ADDIU(buf, rs, rt, val) i_daddiu(buf, rs, rt, val)
457# define i_ADDU(buf, rs, rt, rd) i_daddu(buf, rs, rt, rd)
458# define i_SUBU(buf, rs, rt, rd) i_dsubu(buf, rs, rt, rd)
459# define i_LL(buf, rs, rt, off) i_lld(buf, rs, rt, off)
460# define i_SC(buf, rs, rt, off) i_scd(buf, rs, rt, off)
461#else
462# define i_LW(buf, rs, rt, off) i_lw(buf, rs, rt, off)
463# define i_SW(buf, rs, rt, off) i_sw(buf, rs, rt, off)
464# define i_SLL(buf, rs, rt, sh) i_sll(buf, rs, rt, sh)
465# define i_SRA(buf, rs, rt, sh) i_sra(buf, rs, rt, sh)
466# define i_SRL(buf, rs, rt, sh) i_srl(buf, rs, rt, sh)
467# define i_MFC0(buf, rt, rd) i_mfc0(buf, rt, rd)
468# define i_MTC0(buf, rt, rd) i_mtc0(buf, rt, rd)
469# define i_ADDIU(buf, rs, rt, val) i_addiu(buf, rs, rt, val)
470# define i_ADDU(buf, rs, rt, rd) i_addu(buf, rs, rt, rd)
471# define i_SUBU(buf, rs, rt, rd) i_subu(buf, rs, rt, rd)
472# define i_LL(buf, rs, rt, off) i_ll(buf, rs, rt, off)
473# define i_SC(buf, rs, rt, off) i_sc(buf, rs, rt, off)
474#endif
475
476#define i_b(buf, off) i_beq(buf, 0, 0, off)
477#define i_beqz(buf, rs, off) i_beq(buf, rs, 0, off)
478#define i_beqzl(buf, rs, off) i_beql(buf, rs, 0, off)
479#define i_bnez(buf, rs, off) i_bne(buf, rs, 0, off)
480#define i_bnezl(buf, rs, off) i_bnel(buf, rs, 0, off)
481#define i_move(buf, a, b) i_ADDU(buf, a, 0, b)
482#define i_nop(buf) i_sll(buf, 0, 0, 0)
483#define i_ssnop(buf) i_sll(buf, 0, 0, 1)
484#define i_ehb(buf) i_sll(buf, 0, 0, 3)
485
Ralf Baechle875d43e2005-09-03 15:56:16 -0700486#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487static __init int __attribute__((unused)) in_compat_space_p(long addr)
488{
489 /* Is this address in 32bit compat space? */
Ralf Baechle3ef33e62005-07-08 20:10:17 +0000490 return (((addr) & 0xffffffff00000000L) == 0xffffffff00000000L);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491}
492
493static __init int __attribute__((unused)) rel_highest(long val)
494{
495 return ((((val + 0x800080008000L) >> 48) & 0xffff) ^ 0x8000) - 0x8000;
496}
497
498static __init int __attribute__((unused)) rel_higher(long val)
499{
500 return ((((val + 0x80008000L) >> 32) & 0xffff) ^ 0x8000) - 0x8000;
501}
502#endif
503
504static __init int rel_hi(long val)
505{
506 return ((((val + 0x8000L) >> 16) & 0xffff) ^ 0x8000) - 0x8000;
507}
508
509static __init int rel_lo(long val)
510{
511 return ((val & 0xffff) ^ 0x8000) - 0x8000;
512}
513
514static __init void i_LA_mostly(u32 **buf, unsigned int rs, long addr)
515{
Yoichi Yuasa766160c2005-09-03 15:56:22 -0700516#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 if (!in_compat_space_p(addr)) {
518 i_lui(buf, rs, rel_highest(addr));
519 if (rel_higher(addr))
520 i_daddiu(buf, rs, rs, rel_higher(addr));
521 if (rel_hi(addr)) {
522 i_dsll(buf, rs, rs, 16);
523 i_daddiu(buf, rs, rs, rel_hi(addr));
524 i_dsll(buf, rs, rs, 16);
525 } else
526 i_dsll32(buf, rs, rs, 0);
527 } else
528#endif
529 i_lui(buf, rs, rel_hi(addr));
530}
531
532static __init void __attribute__((unused)) i_LA(u32 **buf, unsigned int rs,
533 long addr)
534{
535 i_LA_mostly(buf, rs, addr);
536 if (rel_lo(addr))
537 i_ADDIU(buf, rs, rs, rel_lo(addr));
538}
539
540/*
541 * handle relocations
542 */
543
544struct reloc {
545 u32 *addr;
546 unsigned int type;
547 enum label_id lab;
548};
549
550static __init void r_mips_pc16(struct reloc **rel, u32 *addr,
551 enum label_id l)
552{
553 (*rel)->addr = addr;
554 (*rel)->type = R_MIPS_PC16;
555 (*rel)->lab = l;
556 (*rel)++;
557}
558
559static inline void __resolve_relocs(struct reloc *rel, struct label *lab)
560{
561 long laddr = (long)lab->addr;
562 long raddr = (long)rel->addr;
563
564 switch (rel->type) {
565 case R_MIPS_PC16:
566 *rel->addr |= build_bimm(laddr - (raddr + 4));
567 break;
568
569 default:
570 panic("Unsupported TLB synthesizer relocation %d",
571 rel->type);
572 }
573}
574
575static __init void resolve_relocs(struct reloc *rel, struct label *lab)
576{
577 struct label *l;
578
579 for (; rel->lab != label_invalid; rel++)
580 for (l = lab; l->lab != label_invalid; l++)
581 if (rel->lab == l->lab)
582 __resolve_relocs(rel, l);
583}
584
585static __init void move_relocs(struct reloc *rel, u32 *first, u32 *end,
586 long off)
587{
588 for (; rel->lab != label_invalid; rel++)
589 if (rel->addr >= first && rel->addr < end)
590 rel->addr += off;
591}
592
593static __init void move_labels(struct label *lab, u32 *first, u32 *end,
594 long off)
595{
596 for (; lab->lab != label_invalid; lab++)
597 if (lab->addr >= first && lab->addr < end)
598 lab->addr += off;
599}
600
601static __init void copy_handler(struct reloc *rel, struct label *lab,
602 u32 *first, u32 *end, u32 *target)
603{
604 long off = (long)(target - first);
605
606 memcpy(target, first, (end - first) * sizeof(u32));
607
608 move_relocs(rel, first, end, off);
609 move_labels(lab, first, end, off);
610}
611
612static __init int __attribute__((unused)) insn_has_bdelay(struct reloc *rel,
613 u32 *addr)
614{
615 for (; rel->lab != label_invalid; rel++) {
616 if (rel->addr == addr
617 && (rel->type == R_MIPS_PC16
618 || rel->type == R_MIPS_26))
619 return 1;
620 }
621
622 return 0;
623}
624
625/* convenience functions for labeled branches */
Ralf Baechle1443e482006-03-08 15:37:26 +0000626static void __init __attribute__((unused))
627 il_bltz(u32 **p, struct reloc **r, unsigned int reg, enum label_id l)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
629 r_mips_pc16(r, *p, l);
630 i_bltz(p, reg, 0);
631}
632
Ralf Baechle1443e482006-03-08 15:37:26 +0000633static void __init __attribute__((unused)) il_b(u32 **p, struct reloc **r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 enum label_id l)
635{
636 r_mips_pc16(r, *p, l);
637 i_b(p, 0);
638}
639
Ralf Baechle1443e482006-03-08 15:37:26 +0000640static void __init il_beqz(u32 **p, struct reloc **r, unsigned int reg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 enum label_id l)
642{
643 r_mips_pc16(r, *p, l);
644 i_beqz(p, reg, 0);
645}
646
Ralf Baechle1443e482006-03-08 15:37:26 +0000647static void __init __attribute__((unused))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648il_beqzl(u32 **p, struct reloc **r, unsigned int reg, enum label_id l)
649{
650 r_mips_pc16(r, *p, l);
651 i_beqzl(p, reg, 0);
652}
653
Ralf Baechle1443e482006-03-08 15:37:26 +0000654static void __init il_bnez(u32 **p, struct reloc **r, unsigned int reg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 enum label_id l)
656{
657 r_mips_pc16(r, *p, l);
658 i_bnez(p, reg, 0);
659}
660
Ralf Baechle1443e482006-03-08 15:37:26 +0000661static void __init il_bgezl(u32 **p, struct reloc **r, unsigned int reg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 enum label_id l)
663{
664 r_mips_pc16(r, *p, l);
665 i_bgezl(p, reg, 0);
666}
667
668/* The only general purpose registers allowed in TLB handlers. */
669#define K0 26
670#define K1 27
671
672/* Some CP0 registers */
673#define C0_INDEX 0
674#define C0_ENTRYLO0 2
675#define C0_ENTRYLO1 3
676#define C0_CONTEXT 4
677#define C0_BADVADDR 8
678#define C0_ENTRYHI 10
679#define C0_EPC 14
680#define C0_XCONTEXT 20
681
Ralf Baechle875d43e2005-09-03 15:56:16 -0700682#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683# define GET_CONTEXT(buf, reg) i_MFC0(buf, reg, C0_XCONTEXT)
684#else
685# define GET_CONTEXT(buf, reg) i_MFC0(buf, reg, C0_CONTEXT)
686#endif
687
688/* The worst case length of the handler is around 18 instructions for
689 * R3000-style TLBs and up to 63 instructions for R4000-style TLBs.
690 * Maximum space available is 32 instructions for R3000 and 64
691 * instructions for R4000.
692 *
693 * We deliberately chose a buffer size of 128, so we won't scribble
694 * over anything important on overflow before we panic.
695 */
696static __initdata u32 tlb_handler[128];
697
698/* simply assume worst case size for labels and relocs */
699static __initdata struct label labels[128];
700static __initdata struct reloc relocs[128];
701
702/*
703 * The R3000 TLB handler is simple.
704 */
705static void __init build_r3000_tlb_refill_handler(void)
706{
707 long pgdc = (long)pgd_current;
708 u32 *p;
709
710 memset(tlb_handler, 0, sizeof(tlb_handler));
711 p = tlb_handler;
712
713 i_mfc0(&p, K0, C0_BADVADDR);
714 i_lui(&p, K1, rel_hi(pgdc)); /* cp0 delay */
715 i_lw(&p, K1, rel_lo(pgdc), K1);
716 i_srl(&p, K0, K0, 22); /* load delay */
717 i_sll(&p, K0, K0, 2);
718 i_addu(&p, K1, K1, K0);
719 i_mfc0(&p, K0, C0_CONTEXT);
720 i_lw(&p, K1, 0, K1); /* cp0 delay */
721 i_andi(&p, K0, K0, 0xffc); /* load delay */
722 i_addu(&p, K1, K1, K0);
723 i_lw(&p, K0, 0, K1);
724 i_nop(&p); /* load delay */
725 i_mtc0(&p, K0, C0_ENTRYLO0);
726 i_mfc0(&p, K1, C0_EPC); /* cp0 delay */
727 i_tlbwr(&p); /* cp0 delay */
728 i_jr(&p, K1);
729 i_rfe(&p); /* branch delay */
730
731 if (p > tlb_handler + 32)
732 panic("TLB refill handler space exceeded");
733
Maciej W. Rozycki41986a62005-06-29 10:24:21 +0000734 printk("Synthesized TLB refill handler (%u instructions).\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 (unsigned int)(p - tlb_handler));
736#ifdef DEBUG_TLB
737 {
738 int i;
739
740 for (i = 0; i < (p - tlb_handler); i++)
741 printk("%08x\n", tlb_handler[i]);
742 }
743#endif
744
745 memcpy((void *)CAC_BASE, tlb_handler, 0x80);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746}
747
748/*
749 * The R4000 TLB handler is much more complicated. We have two
750 * consecutive handler areas with 32 instructions space each.
751 * Since they aren't used at the same time, we can overflow in the
752 * other one.To keep things simple, we first assume linear space,
753 * then we relocate it to the final handler layout as needed.
754 */
755static __initdata u32 final_handler[64];
756
757/*
758 * Hazards
759 *
760 * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0:
761 * 2. A timing hazard exists for the TLBP instruction.
762 *
763 * stalling_instruction
764 * TLBP
765 *
766 * The JTLB is being read for the TLBP throughout the stall generated by the
767 * previous instruction. This is not really correct as the stalling instruction
768 * can modify the address used to access the JTLB. The failure symptom is that
769 * the TLBP instruction will use an address created for the stalling instruction
770 * and not the address held in C0_ENHI and thus report the wrong results.
771 *
772 * The software work-around is to not allow the instruction preceding the TLBP
773 * to stall - make it an NOP or some other instruction guaranteed not to stall.
774 *
775 * Errata 2 will not be fixed. This errata is also on the R5000.
776 *
777 * As if we MIPS hackers wouldn't know how to nop pipelines happy ...
778 */
779static __init void __attribute__((unused)) build_tlb_probe_entry(u32 **p)
780{
781 switch (current_cpu_data.cputype) {
Thiemo Seuferf5b4d952005-09-09 17:11:50 +0000782 /* Found by experiment: R4600 v2.0 needs this, too. */
783 case CPU_R4600:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 case CPU_R5000:
785 case CPU_R5000A:
786 case CPU_NEVADA:
787 i_nop(p);
788 i_tlbp(p);
789 break;
790
791 default:
792 i_tlbp(p);
793 break;
794 }
795}
796
797/*
798 * Write random or indexed TLB entry, and care about the hazards from
799 * the preceeding mtc0 and for the following eret.
800 */
801enum tlb_write_entry { tlb_random, tlb_indexed };
802
803static __init void build_tlb_write_entry(u32 **p, struct label **l,
804 struct reloc **r,
805 enum tlb_write_entry wmode)
806{
807 void(*tlbw)(u32 **) = NULL;
808
809 switch (wmode) {
810 case tlb_random: tlbw = i_tlbwr; break;
811 case tlb_indexed: tlbw = i_tlbwi; break;
812 }
813
814 switch (current_cpu_data.cputype) {
815 case CPU_R4000PC:
816 case CPU_R4000SC:
817 case CPU_R4000MC:
818 case CPU_R4400PC:
819 case CPU_R4400SC:
820 case CPU_R4400MC:
821 /*
822 * This branch uses up a mtc0 hazard nop slot and saves
823 * two nops after the tlbw instruction.
824 */
825 il_bgezl(p, r, 0, label_tlbw_hazard);
826 tlbw(p);
827 l_tlbw_hazard(l, *p);
828 i_nop(p);
829 break;
830
831 case CPU_R4600:
832 case CPU_R4700:
833 case CPU_R5000:
834 case CPU_R5000A:
Maciej W. Rozycki2c93e122005-06-30 10:51:01 +0000835 i_nop(p);
836 tlbw(p);
837 i_nop(p);
838 break;
839
840 case CPU_R4300:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 case CPU_5KC:
842 case CPU_TX49XX:
843 case CPU_AU1000:
844 case CPU_AU1100:
845 case CPU_AU1500:
846 case CPU_AU1550:
Pete Popove3ad1c22005-03-01 06:33:16 +0000847 case CPU_AU1200:
Pete Popovbdf21b12005-07-14 17:47:57 +0000848 case CPU_PR4450:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 i_nop(p);
850 tlbw(p);
851 break;
852
853 case CPU_R10000:
854 case CPU_R12000:
855 case CPU_4KC:
856 case CPU_SB1:
Andrew Isaacson93ce2f522005-10-19 23:56:20 -0700857 case CPU_SB1A:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 case CPU_4KSC:
859 case CPU_20KC:
860 case CPU_25KF:
861 tlbw(p);
862 break;
863
864 case CPU_NEVADA:
865 i_nop(p); /* QED specifies 2 nops hazard */
866 /*
867 * This branch uses up a mtc0 hazard nop slot and saves
868 * a nop after the tlbw instruction.
869 */
870 il_bgezl(p, r, 0, label_tlbw_hazard);
871 tlbw(p);
872 l_tlbw_hazard(l, *p);
873 break;
874
875 case CPU_RM7000:
876 i_nop(p);
877 i_nop(p);
878 i_nop(p);
879 i_nop(p);
880 tlbw(p);
881 break;
882
883 case CPU_4KEC:
884 case CPU_24K:
Ralf Baechlebbc7f222005-07-12 16:12:05 +0000885 case CPU_34K:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 i_ehb(p);
887 tlbw(p);
888 break;
889
890 case CPU_RM9000:
891 /*
892 * When the JTLB is updated by tlbwi or tlbwr, a subsequent
893 * use of the JTLB for instructions should not occur for 4
894 * cpu cycles and use for data translations should not occur
895 * for 3 cpu cycles.
896 */
897 i_ssnop(p);
898 i_ssnop(p);
899 i_ssnop(p);
900 i_ssnop(p);
901 tlbw(p);
902 i_ssnop(p);
903 i_ssnop(p);
904 i_ssnop(p);
905 i_ssnop(p);
906 break;
907
908 case CPU_VR4111:
909 case CPU_VR4121:
910 case CPU_VR4122:
911 case CPU_VR4181:
912 case CPU_VR4181A:
913 i_nop(p);
914 i_nop(p);
915 tlbw(p);
916 i_nop(p);
917 i_nop(p);
918 break;
919
920 case CPU_VR4131:
921 case CPU_VR4133:
Ralf Baechle7623deb2005-08-29 16:49:55 +0000922 case CPU_R5432:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 i_nop(p);
924 i_nop(p);
925 tlbw(p);
926 break;
927
928 default:
929 panic("No TLB refill handler yet (CPU type: %d)",
930 current_cpu_data.cputype);
931 break;
932 }
933}
934
Ralf Baechle875d43e2005-09-03 15:56:16 -0700935#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936/*
937 * TMP and PTR are scratch.
938 * TMP will be clobbered, PTR will hold the pmd entry.
939 */
940static __init void
941build_get_pmde64(u32 **p, struct label **l, struct reloc **r,
942 unsigned int tmp, unsigned int ptr)
943{
944 long pgdc = (long)pgd_current;
945
946 /*
947 * The vmalloc handling is not in the hotpath.
948 */
949 i_dmfc0(p, tmp, C0_BADVADDR);
950 il_bltz(p, r, tmp, label_vmalloc);
951 /* No i_nop needed here, since the next insn doesn't touch TMP. */
952
953#ifdef CONFIG_SMP
Thiemo Seufer1b3a6e92005-04-01 14:07:13 +0000954# ifdef CONFIG_BUILD_ELF64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 /*
Thiemo Seufer1b3a6e92005-04-01 14:07:13 +0000956 * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 * stored in CONTEXT.
958 */
Thiemo Seufer1b3a6e92005-04-01 14:07:13 +0000959 i_dmfc0(p, ptr, C0_CONTEXT);
960 i_dsrl(p, ptr, ptr, 23);
961 i_LA_mostly(p, tmp, pgdc);
962 i_daddu(p, ptr, ptr, tmp);
963 i_dmfc0(p, tmp, C0_BADVADDR);
964 i_ld(p, ptr, rel_lo(pgdc), ptr);
965# else
966 /*
967 * 64 bit SMP running in compat space has the lower part of
968 * &pgd_current[smp_processor_id()] stored in CONTEXT.
969 */
970 if (!in_compat_space_p(pgdc))
971 panic("Invalid page directory address!");
972
973 i_dmfc0(p, ptr, C0_CONTEXT);
974 i_dsra(p, ptr, ptr, 23);
975 i_ld(p, ptr, 0, ptr);
976# endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977#else
978 i_LA_mostly(p, ptr, pgdc);
979 i_ld(p, ptr, rel_lo(pgdc), ptr);
980#endif
981
982 l_vmalloc_done(l, *p);
983 i_dsrl(p, tmp, tmp, PGDIR_SHIFT-3); /* get pgd offset in bytes */
984 i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3);
985 i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */
986 i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */
987 i_ld(p, ptr, 0, ptr); /* get pmd pointer */
988 i_dsrl(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */
989 i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3);
990 i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */
991}
992
993/*
994 * BVADDR is the faulting address, PTR is scratch.
995 * PTR will hold the pgd for vmalloc.
996 */
997static __init void
998build_get_pgd_vmalloc64(u32 **p, struct label **l, struct reloc **r,
999 unsigned int bvaddr, unsigned int ptr)
1000{
1001 long swpd = (long)swapper_pg_dir;
1002
1003 l_vmalloc(l, *p);
1004 i_LA(p, ptr, VMALLOC_START);
1005 i_dsubu(p, bvaddr, bvaddr, ptr);
1006
1007 if (in_compat_space_p(swpd) && !rel_lo(swpd)) {
1008 il_b(p, r, label_vmalloc_done);
1009 i_lui(p, ptr, rel_hi(swpd));
1010 } else {
1011 i_LA_mostly(p, ptr, swpd);
1012 il_b(p, r, label_vmalloc_done);
1013 i_daddiu(p, ptr, ptr, rel_lo(swpd));
1014 }
1015}
1016
Ralf Baechle875d43e2005-09-03 15:56:16 -07001017#else /* !CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
1019/*
1020 * TMP and PTR are scratch.
1021 * TMP will be clobbered, PTR will hold the pgd entry.
1022 */
1023static __init void __attribute__((unused))
1024build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
1025{
1026 long pgdc = (long)pgd_current;
1027
1028 /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */
1029#ifdef CONFIG_SMP
1030 i_mfc0(p, ptr, C0_CONTEXT);
1031 i_LA_mostly(p, tmp, pgdc);
1032 i_srl(p, ptr, ptr, 23);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 i_addu(p, ptr, tmp, ptr);
1034#else
1035 i_LA_mostly(p, ptr, pgdc);
1036#endif
1037 i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
1038 i_lw(p, ptr, rel_lo(pgdc), ptr);
1039 i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */
1040 i_sll(p, tmp, tmp, PGD_T_LOG2);
1041 i_addu(p, ptr, ptr, tmp); /* add in pgd offset */
1042}
1043
Ralf Baechle875d43e2005-09-03 15:56:16 -07001044#endif /* !CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
1046static __init void build_adjust_context(u32 **p, unsigned int ctx)
1047{
1048 unsigned int shift = 4 - (PTE_T_LOG2 + 1);
1049 unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1);
1050
1051 switch (current_cpu_data.cputype) {
1052 case CPU_VR41XX:
1053 case CPU_VR4111:
1054 case CPU_VR4121:
1055 case CPU_VR4122:
1056 case CPU_VR4131:
1057 case CPU_VR4181:
1058 case CPU_VR4181A:
1059 case CPU_VR4133:
1060 shift += 2;
1061 break;
1062
1063 default:
1064 break;
1065 }
1066
1067 if (shift)
1068 i_SRL(p, ctx, ctx, shift);
1069 i_andi(p, ctx, ctx, mask);
1070}
1071
1072static __init void build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr)
1073{
1074 /*
1075 * Bug workaround for the Nevada. It seems as if under certain
1076 * circumstances the move from cp0_context might produce a
1077 * bogus result when the mfc0 instruction and its consumer are
1078 * in a different cacheline or a load instruction, probably any
1079 * memory reference, is between them.
1080 */
1081 switch (current_cpu_data.cputype) {
1082 case CPU_NEVADA:
1083 i_LW(p, ptr, 0, ptr);
1084 GET_CONTEXT(p, tmp); /* get context reg */
1085 break;
1086
1087 default:
1088 GET_CONTEXT(p, tmp); /* get context reg */
1089 i_LW(p, ptr, 0, ptr);
1090 break;
1091 }
1092
1093 build_adjust_context(p, tmp);
1094 i_ADDU(p, ptr, ptr, tmp); /* add in offset */
1095}
1096
1097static __init void build_update_entries(u32 **p, unsigned int tmp,
1098 unsigned int ptep)
1099{
1100 /*
1101 * 64bit address support (36bit on a 32bit CPU) in a 32bit
1102 * Kernel is a special case. Only a few CPUs use it.
1103 */
1104#ifdef CONFIG_64BIT_PHYS_ADDR
1105 if (cpu_has_64bits) {
1106 i_ld(p, tmp, 0, ptep); /* get even pte */
1107 i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
1108 i_dsrl(p, tmp, tmp, 6); /* convert to entrylo0 */
1109 i_mtc0(p, tmp, C0_ENTRYLO0); /* load it */
1110 i_dsrl(p, ptep, ptep, 6); /* convert to entrylo1 */
1111 i_mtc0(p, ptep, C0_ENTRYLO1); /* load it */
1112 } else {
1113 int pte_off_even = sizeof(pte_t) / 2;
1114 int pte_off_odd = pte_off_even + sizeof(pte_t);
1115
1116 /* The pte entries are pre-shifted */
1117 i_lw(p, tmp, pte_off_even, ptep); /* get even pte */
1118 i_mtc0(p, tmp, C0_ENTRYLO0); /* load it */
1119 i_lw(p, ptep, pte_off_odd, ptep); /* get odd pte */
1120 i_mtc0(p, ptep, C0_ENTRYLO1); /* load it */
1121 }
1122#else
1123 i_LW(p, tmp, 0, ptep); /* get even pte */
1124 i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */
1125 if (r45k_bvahwbug())
1126 build_tlb_probe_entry(p);
1127 i_SRL(p, tmp, tmp, 6); /* convert to entrylo0 */
1128 if (r4k_250MHZhwbug())
1129 i_mtc0(p, 0, C0_ENTRYLO0);
1130 i_mtc0(p, tmp, C0_ENTRYLO0); /* load it */
1131 i_SRL(p, ptep, ptep, 6); /* convert to entrylo1 */
1132 if (r45k_bvahwbug())
1133 i_mfc0(p, tmp, C0_INDEX);
1134 if (r4k_250MHZhwbug())
1135 i_mtc0(p, 0, C0_ENTRYLO1);
1136 i_mtc0(p, ptep, C0_ENTRYLO1); /* load it */
1137#endif
1138}
1139
1140static void __init build_r4000_tlb_refill_handler(void)
1141{
1142 u32 *p = tlb_handler;
1143 struct label *l = labels;
1144 struct reloc *r = relocs;
1145 u32 *f;
1146 unsigned int final_len;
1147
1148 memset(tlb_handler, 0, sizeof(tlb_handler));
1149 memset(labels, 0, sizeof(labels));
1150 memset(relocs, 0, sizeof(relocs));
1151 memset(final_handler, 0, sizeof(final_handler));
1152
1153 /*
1154 * create the plain linear handler
1155 */
1156 if (bcm1250_m3_war()) {
1157 i_MFC0(&p, K0, C0_BADVADDR);
1158 i_MFC0(&p, K1, C0_ENTRYHI);
1159 i_xor(&p, K0, K0, K1);
1160 i_SRL(&p, K0, K0, PAGE_SHIFT + 1);
1161 il_bnez(&p, &r, K0, label_leave);
1162 /* No need for i_nop */
1163 }
1164
Ralf Baechle875d43e2005-09-03 15:56:16 -07001165#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
1167#else
1168 build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
1169#endif
1170
1171 build_get_ptep(&p, K0, K1);
1172 build_update_entries(&p, K0, K1);
1173 build_tlb_write_entry(&p, &l, &r, tlb_random);
1174 l_leave(&l, p);
1175 i_eret(&p); /* return from trap */
1176
Ralf Baechle875d43e2005-09-03 15:56:16 -07001177#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 build_get_pgd_vmalloc64(&p, &l, &r, K0, K1);
1179#endif
1180
1181 /*
1182 * Overflow check: For the 64bit handler, we need at least one
1183 * free instruction slot for the wrap-around branch. In worst
1184 * case, if the intended insertion point is a delay slot, we
1185 * need three, with the the second nop'ed and the third being
1186 * unused.
1187 */
Ralf Baechle875d43e2005-09-03 15:56:16 -07001188#ifdef CONFIG_32BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 if ((p - tlb_handler) > 64)
1190 panic("TLB refill handler space exceeded");
1191#else
1192 if (((p - tlb_handler) > 63)
1193 || (((p - tlb_handler) > 61)
1194 && insn_has_bdelay(relocs, tlb_handler + 29)))
1195 panic("TLB refill handler space exceeded");
1196#endif
1197
1198 /*
1199 * Now fold the handler in the TLB refill handler space.
1200 */
Ralf Baechle875d43e2005-09-03 15:56:16 -07001201#ifdef CONFIG_32BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 f = final_handler;
1203 /* Simplest case, just copy the handler. */
1204 copy_handler(relocs, labels, tlb_handler, p, f);
1205 final_len = p - tlb_handler;
Ralf Baechle875d43e2005-09-03 15:56:16 -07001206#else /* CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 f = final_handler + 32;
1208 if ((p - tlb_handler) <= 32) {
1209 /* Just copy the handler. */
1210 copy_handler(relocs, labels, tlb_handler, p, f);
1211 final_len = p - tlb_handler;
1212 } else {
1213 u32 *split = tlb_handler + 30;
1214
1215 /*
1216 * Find the split point.
1217 */
1218 if (insn_has_bdelay(relocs, split - 1))
1219 split--;
1220
1221 /* Copy first part of the handler. */
1222 copy_handler(relocs, labels, tlb_handler, split, f);
1223 f += split - tlb_handler;
1224
1225 /* Insert branch. */
1226 l_split(&l, final_handler);
1227 il_b(&f, &r, label_split);
1228 if (insn_has_bdelay(relocs, split))
1229 i_nop(&f);
1230 else {
1231 copy_handler(relocs, labels, split, split + 1, f);
1232 move_labels(labels, f, f + 1, -1);
1233 f++;
1234 split++;
1235 }
1236
1237 /* Copy the rest of the handler. */
1238 copy_handler(relocs, labels, split, p, final_handler);
1239 final_len = (f - (final_handler + 32)) + (p - split);
1240 }
Ralf Baechle875d43e2005-09-03 15:56:16 -07001241#endif /* CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
1243 resolve_relocs(relocs, labels);
1244 printk("Synthesized TLB refill handler (%u instructions).\n",
1245 final_len);
1246
1247#ifdef DEBUG_TLB
1248 {
1249 int i;
1250
Maciej W. Rozycki4c0a2d42005-06-29 10:43:51 +00001251 f = final_handler;
1252#ifdef CONFIG_64BIT
1253 if (final_len > 32)
1254 final_len = 64;
1255 else
1256 f = final_handler + 32;
1257#endif /* CONFIG_64BIT */
Maciej W. Rozycki9678e282005-06-13 20:09:32 +00001258 for (i = 0; i < final_len; i++)
Maciej W. Rozycki4c0a2d42005-06-29 10:43:51 +00001259 printk("%08x\n", f[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 }
1261#endif
1262
1263 memcpy((void *)CAC_BASE, final_handler, 0x100);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264}
1265
1266/*
1267 * TLB load/store/modify handlers.
1268 *
1269 * Only the fastpath gets synthesized at runtime, the slowpath for
1270 * do_page_fault remains normal asm.
1271 */
1272extern void tlb_do_page_fault_0(void);
1273extern void tlb_do_page_fault_1(void);
1274
1275#define __tlb_handler_align \
1276 __attribute__((__aligned__(1 << CONFIG_MIPS_L1_CACHE_SHIFT)))
1277
1278/*
1279 * 128 instructions for the fastpath handler is generous and should
1280 * never be exceeded.
1281 */
1282#define FASTPATH_SIZE 128
1283
1284u32 __tlb_handler_align handle_tlbl[FASTPATH_SIZE];
1285u32 __tlb_handler_align handle_tlbs[FASTPATH_SIZE];
1286u32 __tlb_handler_align handle_tlbm[FASTPATH_SIZE];
1287
1288static void __init
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001289iPTE_LW(u32 **p, struct label **l, unsigned int pte, unsigned int ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290{
1291#ifdef CONFIG_SMP
1292# ifdef CONFIG_64BIT_PHYS_ADDR
1293 if (cpu_has_64bits)
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001294 i_lld(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 else
1296# endif
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001297 i_LL(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298#else
1299# ifdef CONFIG_64BIT_PHYS_ADDR
1300 if (cpu_has_64bits)
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001301 i_ld(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 else
1303# endif
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001304 i_LW(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305#endif
1306}
1307
1308static void __init
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001309iPTE_SW(u32 **p, struct reloc **r, unsigned int pte, unsigned int ptr,
1310 unsigned int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311{
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001312#ifdef CONFIG_64BIT_PHYS_ADDR
1313 unsigned int hwmode = mode & (_PAGE_VALID | _PAGE_DIRTY);
1314#endif
1315
1316 i_ori(p, pte, pte, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317#ifdef CONFIG_SMP
1318# ifdef CONFIG_64BIT_PHYS_ADDR
1319 if (cpu_has_64bits)
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001320 i_scd(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 else
1322# endif
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001323 i_SC(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
1325 if (r10000_llsc_war())
1326 il_beqzl(p, r, pte, label_smp_pgtable_change);
1327 else
1328 il_beqz(p, r, pte, label_smp_pgtable_change);
1329
1330# ifdef CONFIG_64BIT_PHYS_ADDR
1331 if (!cpu_has_64bits) {
1332 /* no i_nop needed */
1333 i_ll(p, pte, sizeof(pte_t) / 2, ptr);
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001334 i_ori(p, pte, pte, hwmode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 i_sc(p, pte, sizeof(pte_t) / 2, ptr);
1336 il_beqz(p, r, pte, label_smp_pgtable_change);
1337 /* no i_nop needed */
1338 i_lw(p, pte, 0, ptr);
1339 } else
1340 i_nop(p);
1341# else
1342 i_nop(p);
1343# endif
1344#else
1345# ifdef CONFIG_64BIT_PHYS_ADDR
1346 if (cpu_has_64bits)
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001347 i_sd(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 else
1349# endif
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001350 i_SW(p, pte, 0, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
1352# ifdef CONFIG_64BIT_PHYS_ADDR
1353 if (!cpu_has_64bits) {
1354 i_lw(p, pte, sizeof(pte_t) / 2, ptr);
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001355 i_ori(p, pte, pte, hwmode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 i_sw(p, pte, sizeof(pte_t) / 2, ptr);
1357 i_lw(p, pte, 0, ptr);
1358 }
1359# endif
1360#endif
1361}
1362
1363/*
1364 * Check if PTE is present, if not then jump to LABEL. PTR points to
1365 * the page table where this PTE is located, PTE will be re-loaded
1366 * with it's original value.
1367 */
1368static void __init
1369build_pte_present(u32 **p, struct label **l, struct reloc **r,
1370 unsigned int pte, unsigned int ptr, enum label_id lid)
1371{
1372 i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_READ);
1373 i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_READ);
1374 il_bnez(p, r, pte, lid);
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001375 iPTE_LW(p, l, pte, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376}
1377
1378/* Make PTE valid, store result in PTR. */
1379static void __init
1380build_make_valid(u32 **p, struct reloc **r, unsigned int pte,
1381 unsigned int ptr)
1382{
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001383 unsigned int mode = _PAGE_VALID | _PAGE_ACCESSED;
1384
1385 iPTE_SW(p, r, pte, ptr, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386}
1387
1388/*
1389 * Check if PTE can be written to, if not branch to LABEL. Regardless
1390 * restore PTE with value from PTR when done.
1391 */
1392static void __init
1393build_pte_writable(u32 **p, struct label **l, struct reloc **r,
1394 unsigned int pte, unsigned int ptr, enum label_id lid)
1395{
1396 i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
1397 i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE);
1398 il_bnez(p, r, pte, lid);
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001399 iPTE_LW(p, l, pte, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400}
1401
1402/* Make PTE writable, update software status bits as well, then store
1403 * at PTR.
1404 */
1405static void __init
1406build_make_write(u32 **p, struct reloc **r, unsigned int pte,
1407 unsigned int ptr)
1408{
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001409 unsigned int mode = (_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID
1410 | _PAGE_DIRTY);
1411
1412 iPTE_SW(p, r, pte, ptr, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413}
1414
1415/*
1416 * Check if PTE can be modified, if not branch to LABEL. Regardless
1417 * restore PTE with value from PTR when done.
1418 */
1419static void __init
1420build_pte_modifiable(u32 **p, struct label **l, struct reloc **r,
1421 unsigned int pte, unsigned int ptr, enum label_id lid)
1422{
1423 i_andi(p, pte, pte, _PAGE_WRITE);
1424 il_beqz(p, r, pte, lid);
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001425 iPTE_LW(p, l, pte, ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426}
1427
1428/*
1429 * R3000 style TLB load/store/modify handlers.
1430 */
1431
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001432/*
1433 * This places the pte into ENTRYLO0 and writes it with tlbwi.
1434 * Then it returns.
1435 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436static void __init
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001437build_r3000_pte_reload_tlbwi(u32 **p, unsigned int pte, unsigned int tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438{
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001439 i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1440 i_mfc0(p, tmp, C0_EPC); /* cp0 delay */
1441 i_tlbwi(p);
1442 i_jr(p, tmp);
1443 i_rfe(p); /* branch delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444}
1445
1446/*
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001447 * This places the pte into ENTRYLO0 and writes it with tlbwi
1448 * or tlbwr as appropriate. This is because the index register
1449 * may have the probe fail bit set as a result of a trap on a
1450 * kseg2 access, i.e. without refill. Then it returns.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 */
1452static void __init
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001453build_r3000_tlb_reload_write(u32 **p, struct label **l, struct reloc **r,
1454 unsigned int pte, unsigned int tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455{
1456 i_mfc0(p, tmp, C0_INDEX);
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001457 i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */
1458 il_bltz(p, r, tmp, label_r3000_write_probe_fail); /* cp0 delay */
1459 i_mfc0(p, tmp, C0_EPC); /* branch delay */
1460 i_tlbwi(p); /* cp0 delay */
1461 i_jr(p, tmp);
1462 i_rfe(p); /* branch delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 l_r3000_write_probe_fail(l, *p);
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001464 i_tlbwr(p); /* cp0 delay */
1465 i_jr(p, tmp);
1466 i_rfe(p); /* branch delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467}
1468
1469static void __init
1470build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte,
1471 unsigned int ptr)
1472{
1473 long pgdc = (long)pgd_current;
1474
1475 i_mfc0(p, pte, C0_BADVADDR);
1476 i_lui(p, ptr, rel_hi(pgdc)); /* cp0 delay */
1477 i_lw(p, ptr, rel_lo(pgdc), ptr);
1478 i_srl(p, pte, pte, 22); /* load delay */
1479 i_sll(p, pte, pte, 2);
1480 i_addu(p, ptr, ptr, pte);
1481 i_mfc0(p, pte, C0_CONTEXT);
1482 i_lw(p, ptr, 0, ptr); /* cp0 delay */
1483 i_andi(p, pte, pte, 0xffc); /* load delay */
1484 i_addu(p, ptr, ptr, pte);
1485 i_lw(p, pte, 0, ptr);
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001486 i_tlbp(p); /* load delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487}
1488
1489static void __init build_r3000_tlb_load_handler(void)
1490{
1491 u32 *p = handle_tlbl;
1492 struct label *l = labels;
1493 struct reloc *r = relocs;
1494
1495 memset(handle_tlbl, 0, sizeof(handle_tlbl));
1496 memset(labels, 0, sizeof(labels));
1497 memset(relocs, 0, sizeof(relocs));
1498
1499 build_r3000_tlbchange_handler_head(&p, K0, K1);
1500 build_pte_present(&p, &l, &r, K0, K1, label_nopage_tlbl);
Maciej W. Rozyckid925c262005-06-13 20:12:01 +00001501 i_nop(&p); /* load delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 build_make_valid(&p, &r, K0, K1);
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001503 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504
1505 l_nopage_tlbl(&l, p);
1506 i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
1507 i_nop(&p);
1508
1509 if ((p - handle_tlbl) > FASTPATH_SIZE)
1510 panic("TLB load handler fastpath space exceeded");
1511
1512 resolve_relocs(relocs, labels);
1513 printk("Synthesized TLB load handler fastpath (%u instructions).\n",
1514 (unsigned int)(p - handle_tlbl));
1515
1516#ifdef DEBUG_TLB
1517 {
1518 int i;
1519
Maciej W. Rozycki9678e282005-06-13 20:09:32 +00001520 for (i = 0; i < (p - handle_tlbl); i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 printk("%08x\n", handle_tlbl[i]);
1522 }
1523#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524}
1525
1526static void __init build_r3000_tlb_store_handler(void)
1527{
1528 u32 *p = handle_tlbs;
1529 struct label *l = labels;
1530 struct reloc *r = relocs;
1531
1532 memset(handle_tlbs, 0, sizeof(handle_tlbs));
1533 memset(labels, 0, sizeof(labels));
1534 memset(relocs, 0, sizeof(relocs));
1535
1536 build_r3000_tlbchange_handler_head(&p, K0, K1);
1537 build_pte_writable(&p, &l, &r, K0, K1, label_nopage_tlbs);
Maciej W. Rozyckid925c262005-06-13 20:12:01 +00001538 i_nop(&p); /* load delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 build_make_write(&p, &r, K0, K1);
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001540 build_r3000_tlb_reload_write(&p, &l, &r, K0, K1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541
1542 l_nopage_tlbs(&l, p);
1543 i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1544 i_nop(&p);
1545
1546 if ((p - handle_tlbs) > FASTPATH_SIZE)
1547 panic("TLB store handler fastpath space exceeded");
1548
1549 resolve_relocs(relocs, labels);
1550 printk("Synthesized TLB store handler fastpath (%u instructions).\n",
1551 (unsigned int)(p - handle_tlbs));
1552
1553#ifdef DEBUG_TLB
1554 {
1555 int i;
1556
Maciej W. Rozycki9678e282005-06-13 20:09:32 +00001557 for (i = 0; i < (p - handle_tlbs); i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 printk("%08x\n", handle_tlbs[i]);
1559 }
1560#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561}
1562
1563static void __init build_r3000_tlb_modify_handler(void)
1564{
1565 u32 *p = handle_tlbm;
1566 struct label *l = labels;
1567 struct reloc *r = relocs;
1568
1569 memset(handle_tlbm, 0, sizeof(handle_tlbm));
1570 memset(labels, 0, sizeof(labels));
1571 memset(relocs, 0, sizeof(relocs));
1572
1573 build_r3000_tlbchange_handler_head(&p, K0, K1);
1574 build_pte_modifiable(&p, &l, &r, K0, K1, label_nopage_tlbm);
Maciej W. Rozyckid925c262005-06-13 20:12:01 +00001575 i_nop(&p); /* load delay */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 build_make_write(&p, &r, K0, K1);
Maciej W. Rozyckifded2e52005-06-13 20:24:00 +00001577 build_r3000_pte_reload_tlbwi(&p, K0, K1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578
1579 l_nopage_tlbm(&l, p);
1580 i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1581 i_nop(&p);
1582
1583 if ((p - handle_tlbm) > FASTPATH_SIZE)
1584 panic("TLB modify handler fastpath space exceeded");
1585
1586 resolve_relocs(relocs, labels);
1587 printk("Synthesized TLB modify handler fastpath (%u instructions).\n",
1588 (unsigned int)(p - handle_tlbm));
1589
1590#ifdef DEBUG_TLB
1591 {
1592 int i;
1593
Maciej W. Rozycki9678e282005-06-13 20:09:32 +00001594 for (i = 0; i < (p - handle_tlbm); i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 printk("%08x\n", handle_tlbm[i]);
1596 }
1597#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598}
1599
1600/*
1601 * R4000 style TLB load/store/modify handlers.
1602 */
1603static void __init
1604build_r4000_tlbchange_handler_head(u32 **p, struct label **l,
1605 struct reloc **r, unsigned int pte,
1606 unsigned int ptr)
1607{
Ralf Baechle875d43e2005-09-03 15:56:16 -07001608#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 build_get_pmde64(p, l, r, pte, ptr); /* get pmd in ptr */
1610#else
1611 build_get_pgde32(p, pte, ptr); /* get pgd in ptr */
1612#endif
1613
1614 i_MFC0(p, pte, C0_BADVADDR);
1615 i_LW(p, ptr, 0, ptr);
1616 i_SRL(p, pte, pte, PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2);
1617 i_andi(p, pte, pte, (PTRS_PER_PTE - 1) << PTE_T_LOG2);
1618 i_ADDU(p, ptr, ptr, pte);
1619
1620#ifdef CONFIG_SMP
1621 l_smp_pgtable_change(l, *p);
1622# endif
Thiemo Seufer63b2d2f2005-04-28 08:52:57 +00001623 iPTE_LW(p, l, pte, ptr); /* get even pte */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 build_tlb_probe_entry(p);
1625}
1626
1627static void __init
1628build_r4000_tlbchange_handler_tail(u32 **p, struct label **l,
1629 struct reloc **r, unsigned int tmp,
1630 unsigned int ptr)
1631{
1632 i_ori(p, ptr, ptr, sizeof(pte_t));
1633 i_xori(p, ptr, ptr, sizeof(pte_t));
1634 build_update_entries(p, tmp, ptr);
1635 build_tlb_write_entry(p, l, r, tlb_indexed);
1636 l_leave(l, *p);
1637 i_eret(p); /* return from trap */
1638
Ralf Baechle875d43e2005-09-03 15:56:16 -07001639#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 build_get_pgd_vmalloc64(p, l, r, tmp, ptr);
1641#endif
1642}
1643
1644static void __init build_r4000_tlb_load_handler(void)
1645{
1646 u32 *p = handle_tlbl;
1647 struct label *l = labels;
1648 struct reloc *r = relocs;
1649
1650 memset(handle_tlbl, 0, sizeof(handle_tlbl));
1651 memset(labels, 0, sizeof(labels));
1652 memset(relocs, 0, sizeof(relocs));
1653
1654 if (bcm1250_m3_war()) {
1655 i_MFC0(&p, K0, C0_BADVADDR);
1656 i_MFC0(&p, K1, C0_ENTRYHI);
1657 i_xor(&p, K0, K0, K1);
1658 i_SRL(&p, K0, K0, PAGE_SHIFT + 1);
1659 il_bnez(&p, &r, K0, label_leave);
1660 /* No need for i_nop */
1661 }
1662
1663 build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1);
1664 build_pte_present(&p, &l, &r, K0, K1, label_nopage_tlbl);
1665 build_make_valid(&p, &r, K0, K1);
1666 build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1);
1667
1668 l_nopage_tlbl(&l, p);
1669 i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff);
1670 i_nop(&p);
1671
1672 if ((p - handle_tlbl) > FASTPATH_SIZE)
1673 panic("TLB load handler fastpath space exceeded");
1674
1675 resolve_relocs(relocs, labels);
1676 printk("Synthesized TLB load handler fastpath (%u instructions).\n",
1677 (unsigned int)(p - handle_tlbl));
1678
1679#ifdef DEBUG_TLB
1680 {
1681 int i;
1682
Maciej W. Rozycki9678e282005-06-13 20:09:32 +00001683 for (i = 0; i < (p - handle_tlbl); i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 printk("%08x\n", handle_tlbl[i]);
1685 }
1686#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687}
1688
1689static void __init build_r4000_tlb_store_handler(void)
1690{
1691 u32 *p = handle_tlbs;
1692 struct label *l = labels;
1693 struct reloc *r = relocs;
1694
1695 memset(handle_tlbs, 0, sizeof(handle_tlbs));
1696 memset(labels, 0, sizeof(labels));
1697 memset(relocs, 0, sizeof(relocs));
1698
1699 build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1);
1700 build_pte_writable(&p, &l, &r, K0, K1, label_nopage_tlbs);
1701 build_make_write(&p, &r, K0, K1);
1702 build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1);
1703
1704 l_nopage_tlbs(&l, p);
1705 i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1706 i_nop(&p);
1707
1708 if ((p - handle_tlbs) > FASTPATH_SIZE)
1709 panic("TLB store handler fastpath space exceeded");
1710
1711 resolve_relocs(relocs, labels);
1712 printk("Synthesized TLB store handler fastpath (%u instructions).\n",
1713 (unsigned int)(p - handle_tlbs));
1714
1715#ifdef DEBUG_TLB
1716 {
1717 int i;
1718
Maciej W. Rozycki9678e282005-06-13 20:09:32 +00001719 for (i = 0; i < (p - handle_tlbs); i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 printk("%08x\n", handle_tlbs[i]);
1721 }
1722#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723}
1724
1725static void __init build_r4000_tlb_modify_handler(void)
1726{
1727 u32 *p = handle_tlbm;
1728 struct label *l = labels;
1729 struct reloc *r = relocs;
1730
1731 memset(handle_tlbm, 0, sizeof(handle_tlbm));
1732 memset(labels, 0, sizeof(labels));
1733 memset(relocs, 0, sizeof(relocs));
1734
1735 build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1);
1736 build_pte_modifiable(&p, &l, &r, K0, K1, label_nopage_tlbm);
1737 /* Present and writable bits set, set accessed and dirty bits. */
1738 build_make_write(&p, &r, K0, K1);
1739 build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1);
1740
1741 l_nopage_tlbm(&l, p);
1742 i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff);
1743 i_nop(&p);
1744
1745 if ((p - handle_tlbm) > FASTPATH_SIZE)
1746 panic("TLB modify handler fastpath space exceeded");
1747
1748 resolve_relocs(relocs, labels);
1749 printk("Synthesized TLB modify handler fastpath (%u instructions).\n",
1750 (unsigned int)(p - handle_tlbm));
1751
1752#ifdef DEBUG_TLB
1753 {
1754 int i;
1755
Maciej W. Rozycki9678e282005-06-13 20:09:32 +00001756 for (i = 0; i < (p - handle_tlbm); i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 printk("%08x\n", handle_tlbm[i]);
1758 }
1759#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760}
1761
1762void __init build_tlb_refill_handler(void)
1763{
1764 /*
1765 * The refill handler is generated per-CPU, multi-node systems
1766 * may have local storage for it. The other handlers are only
1767 * needed once.
1768 */
1769 static int run_once = 0;
1770
1771 switch (current_cpu_data.cputype) {
1772 case CPU_R2000:
1773 case CPU_R3000:
1774 case CPU_R3000A:
1775 case CPU_R3081E:
1776 case CPU_TX3912:
1777 case CPU_TX3922:
1778 case CPU_TX3927:
1779 build_r3000_tlb_refill_handler();
1780 if (!run_once) {
1781 build_r3000_tlb_load_handler();
1782 build_r3000_tlb_store_handler();
1783 build_r3000_tlb_modify_handler();
1784 run_once++;
1785 }
1786 break;
1787
1788 case CPU_R6000:
1789 case CPU_R6000A:
1790 panic("No R6000 TLB refill handler yet");
1791 break;
1792
1793 case CPU_R8000:
1794 panic("No R8000 TLB refill handler yet");
1795 break;
1796
1797 default:
1798 build_r4000_tlb_refill_handler();
1799 if (!run_once) {
1800 build_r4000_tlb_load_handler();
1801 build_r4000_tlb_store_handler();
1802 build_r4000_tlb_modify_handler();
1803 run_once++;
1804 }
1805 }
1806}
Ralf Baechle1d40cfc2005-07-15 15:23:23 +00001807
1808void __init flush_tlb_handlers(void)
1809{
1810 flush_icache_range((unsigned long)handle_tlbl,
1811 (unsigned long)handle_tlbl + sizeof(handle_tlbl));
1812 flush_icache_range((unsigned long)handle_tlbs,
1813 (unsigned long)handle_tlbs + sizeof(handle_tlbs));
1814 flush_icache_range((unsigned long)handle_tlbm,
1815 (unsigned long)handle_tlbm + sizeof(handle_tlbm));
1816}