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pata_efar: fix PIO2 underclocking
[linux-2.6/mini2440.git] / arch / ia64 / xen / xen_pv_ops.c
blob5e2270a999fa58f410093c50cd30f92510c7a780
1 /******************************************************************************
2 * arch/ia64/xen/xen_pv_ops.c
3 *
4 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
5 * VA Linux Systems Japan K.K.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23 #include <linux/console.h>
24 #include <linux/irq.h>
25 #include <linux/kernel.h>
26 #include <linux/pm.h>
27 #include <linux/unistd.h>
28
29 #include <asm/xen/hypervisor.h>
30 #include <asm/xen/xencomm.h>
31 #include <asm/xen/privop.h>
32
33 #include "irq_xen.h"
34 #include "time.h"
35
36 /***************************************************************************
37 * general info
38 */
39 static struct pv_info xen_info __initdata = {
40 .kernel_rpl = 2, /* or 1: determin at runtime */
41 .paravirt_enabled = 1,
42 .name = "Xen/ia64",
43 };
44
45 #define IA64_RSC_PL_SHIFT 2
46 #define IA64_RSC_PL_BIT_SIZE 2
47 #define IA64_RSC_PL_MASK \
48 (((1UL << IA64_RSC_PL_BIT_SIZE) - 1) << IA64_RSC_PL_SHIFT)
49
50 static void __init
51 xen_info_init(void)
52 {
53 /* Xenified Linux/ia64 may run on pl = 1 or 2.
54 * determin at run time. */
55 unsigned long rsc = ia64_getreg(_IA64_REG_AR_RSC);
56 unsigned int rpl = (rsc & IA64_RSC_PL_MASK) >> IA64_RSC_PL_SHIFT;
57 xen_info.kernel_rpl = rpl;
58 }
59
60 /***************************************************************************
61 * pv_init_ops
62 * initialization hooks.
63 */
64
65 static void
66 xen_panic_hypercall(struct unw_frame_info *info, void *arg)
67 {
68 current->thread.ksp = (__u64)info->sw - 16;
69 HYPERVISOR_shutdown(SHUTDOWN_crash);
70 /* we're never actually going to get here... */
71 }
72
73 static int
74 xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
75 {
76 unw_init_running(xen_panic_hypercall, NULL);
77 /* we're never actually going to get here... */
78 return NOTIFY_DONE;
79 }
80
81 static struct notifier_block xen_panic_block = {
82 xen_panic_event, NULL, 0 /* try to go last */
83 };
84
85 static void xen_pm_power_off(void)
86 {
87 local_irq_disable();
88 HYPERVISOR_shutdown(SHUTDOWN_poweroff);
89 }
90
91 static void __init
92 xen_banner(void)
93 {
94 printk(KERN_INFO
95 "Running on Xen! pl = %d start_info_pfn=0x%lx nr_pages=%ld "
96 "flags=0x%x\n",
97 xen_info.kernel_rpl,
98 HYPERVISOR_shared_info->arch.start_info_pfn,
99 xen_start_info->nr_pages, xen_start_info->flags);
100 }
101
102 static int __init
103 xen_reserve_memory(struct rsvd_region *region)
104 {
105 region->start = (unsigned long)__va(
106 (HYPERVISOR_shared_info->arch.start_info_pfn << PAGE_SHIFT));
107 region->end = region->start + PAGE_SIZE;
108 return 1;
109 }
110
111 static void __init
112 xen_arch_setup_early(void)
113 {
114 struct shared_info *s;
115 BUG_ON(!xen_pv_domain());
116
117 s = HYPERVISOR_shared_info;
118 xen_start_info = __va(s->arch.start_info_pfn << PAGE_SHIFT);
119
120 /* Must be done before any hypercall. */
121 xencomm_initialize();
122
123 xen_setup_features();
124 /* Register a call for panic conditions. */
125 atomic_notifier_chain_register(&panic_notifier_list,
126 &xen_panic_block);
127 pm_power_off = xen_pm_power_off;
128
129 xen_ia64_enable_opt_feature();
130 }
131
132 static void __init
133 xen_arch_setup_console(char **cmdline_p)
134 {
135 add_preferred_console("xenboot", 0, NULL);
136 add_preferred_console("tty", 0, NULL);
137 /* use hvc_xen */
138 add_preferred_console("hvc", 0, NULL);
139
140 #if !defined(CONFIG_VT) || !defined(CONFIG_DUMMY_CONSOLE)
141 conswitchp = NULL;
142 #endif
143 }
144
145 static int __init
146 xen_arch_setup_nomca(void)
147 {
148 return 1;
149 }
150
151 static void __init
152 xen_post_smp_prepare_boot_cpu(void)
153 {
154 xen_setup_vcpu_info_placement();
155 }
156
157 #ifdef ASM_SUPPORTED
158 static unsigned long __init_or_module
159 xen_patch_bundle(void *sbundle, void *ebundle, unsigned long type);
160 #endif
161 static void __init
162 xen_patch_branch(unsigned long tag, unsigned long type);
163
164 static const struct pv_init_ops xen_init_ops __initconst = {
165 .banner = xen_banner,
166
167 .reserve_memory = xen_reserve_memory,
168
169 .arch_setup_early = xen_arch_setup_early,
170 .arch_setup_console = xen_arch_setup_console,
171 .arch_setup_nomca = xen_arch_setup_nomca,
172
173 .post_smp_prepare_boot_cpu = xen_post_smp_prepare_boot_cpu,
174 #ifdef ASM_SUPPORTED
175 .patch_bundle = xen_patch_bundle,
176 #endif
177 .patch_branch = xen_patch_branch,
178 };
179
180 /***************************************************************************
181 * pv_fsys_data
182 * addresses for fsys
183 */
184
185 extern unsigned long xen_fsyscall_table[NR_syscalls];
186 extern char xen_fsys_bubble_down[];
187 struct pv_fsys_data xen_fsys_data __initdata = {
188 .fsyscall_table = (unsigned long *)xen_fsyscall_table,
189 .fsys_bubble_down = (void *)xen_fsys_bubble_down,
190 };
191
192 /***************************************************************************
193 * pv_patchdata
194 * patchdata addresses
195 */
196
197 #define DECLARE(name) \
198 extern unsigned long __xen_start_gate_##name##_patchlist[]; \
199 extern unsigned long __xen_end_gate_##name##_patchlist[]
200
201 DECLARE(fsyscall);
202 DECLARE(brl_fsys_bubble_down);
203 DECLARE(vtop);
204 DECLARE(mckinley_e9);
205
206 extern unsigned long __xen_start_gate_section[];
207
208 #define ASSIGN(name) \
209 .start_##name##_patchlist = \
210 (unsigned long)__xen_start_gate_##name##_patchlist, \
211 .end_##name##_patchlist = \
212 (unsigned long)__xen_end_gate_##name##_patchlist
213
214 static struct pv_patchdata xen_patchdata __initdata = {
215 ASSIGN(fsyscall),
216 ASSIGN(brl_fsys_bubble_down),
217 ASSIGN(vtop),
218 ASSIGN(mckinley_e9),
219
220 .gate_section = (void*)__xen_start_gate_section,
221 };
222
223 /***************************************************************************
224 * pv_cpu_ops
225 * intrinsics hooks.
226 */
227
228 #ifndef ASM_SUPPORTED
229 static void
230 xen_set_itm_with_offset(unsigned long val)
231 {
232 /* ia64_cpu_local_tick() calls this with interrupt enabled. */
233 /* WARN_ON(!irqs_disabled()); */
234 xen_set_itm(val - XEN_MAPPEDREGS->itc_offset);
235 }
236
237 static unsigned long
238 xen_get_itm_with_offset(void)
239 {
240 /* unused at this moment */
241 printk(KERN_DEBUG "%s is called.\n", __func__);
242
243 WARN_ON(!irqs_disabled());
244 return ia64_native_getreg(_IA64_REG_CR_ITM) +
245 XEN_MAPPEDREGS->itc_offset;
246 }
247
248 /* ia64_set_itc() is only called by
249 * cpu_init() with ia64_set_itc(0) and ia64_sync_itc().
250 * So XEN_MAPPEDRESG->itc_offset cal be considered as almost constant.
251 */
252 static void
253 xen_set_itc(unsigned long val)
254 {
255 unsigned long mitc;
256
257 WARN_ON(!irqs_disabled());
258 mitc = ia64_native_getreg(_IA64_REG_AR_ITC);
259 XEN_MAPPEDREGS->itc_offset = val - mitc;
260 XEN_MAPPEDREGS->itc_last = val;
261 }
262
263 static unsigned long
264 xen_get_itc(void)
265 {
266 unsigned long res;
267 unsigned long itc_offset;
268 unsigned long itc_last;
269 unsigned long ret_itc_last;
270
271 itc_offset = XEN_MAPPEDREGS->itc_offset;
272 do {
273 itc_last = XEN_MAPPEDREGS->itc_last;
274 res = ia64_native_getreg(_IA64_REG_AR_ITC);
275 res += itc_offset;
276 if (itc_last >= res)
277 res = itc_last + 1;
278 ret_itc_last = cmpxchg(&XEN_MAPPEDREGS->itc_last,
279 itc_last, res);
280 } while (unlikely(ret_itc_last != itc_last));
281 return res;
282
283 #if 0
284 /* ia64_itc_udelay() calls ia64_get_itc() with interrupt enabled.
285 Should it be paravirtualized instead? */
286 WARN_ON(!irqs_disabled());
287 itc_offset = XEN_MAPPEDREGS->itc_offset;
288 itc_last = XEN_MAPPEDREGS->itc_last;
289 res = ia64_native_getreg(_IA64_REG_AR_ITC);
290 res += itc_offset;
291 if (itc_last >= res)
292 res = itc_last + 1;
293 XEN_MAPPEDREGS->itc_last = res;
294 return res;
295 #endif
296 }
297
298 static void xen_setreg(int regnum, unsigned long val)
299 {
300 switch (regnum) {
301 case _IA64_REG_AR_KR0 ... _IA64_REG_AR_KR7:
302 xen_set_kr(regnum - _IA64_REG_AR_KR0, val);
303 break;
304 #ifdef CONFIG_IA32_SUPPORT
305 case _IA64_REG_AR_EFLAG:
306 xen_set_eflag(val);
307 break;
308 #endif
309 case _IA64_REG_AR_ITC:
310 xen_set_itc(val);
311 break;
312 case _IA64_REG_CR_TPR:
313 xen_set_tpr(val);
314 break;
315 case _IA64_REG_CR_ITM:
316 xen_set_itm_with_offset(val);
317 break;
318 case _IA64_REG_CR_EOI:
319 xen_eoi(val);
320 break;
321 default:
322 ia64_native_setreg_func(regnum, val);
323 break;
324 }
325 }
326
327 static unsigned long xen_getreg(int regnum)
328 {
329 unsigned long res;
330
331 switch (regnum) {
332 case _IA64_REG_PSR:
333 res = xen_get_psr();
334 break;
335 #ifdef CONFIG_IA32_SUPPORT
336 case _IA64_REG_AR_EFLAG:
337 res = xen_get_eflag();
338 break;
339 #endif
340 case _IA64_REG_AR_ITC:
341 res = xen_get_itc();
342 break;
343 case _IA64_REG_CR_ITM:
344 res = xen_get_itm_with_offset();
345 break;
346 case _IA64_REG_CR_IVR:
347 res = xen_get_ivr();
348 break;
349 case _IA64_REG_CR_TPR:
350 res = xen_get_tpr();
351 break;
352 default:
353 res = ia64_native_getreg_func(regnum);
354 break;
355 }
356 return res;
357 }
358
359 /* turning on interrupts is a bit more complicated.. write to the
360 * memory-mapped virtual psr.i bit first (to avoid race condition),
361 * then if any interrupts were pending, we have to execute a hyperprivop
362 * to ensure the pending interrupt gets delivered; else we're done! */
363 static void
364 xen_ssm_i(void)
365 {
366 int old = xen_get_virtual_psr_i();
367 xen_set_virtual_psr_i(1);
368 barrier();
369 if (!old && xen_get_virtual_pend())
370 xen_hyper_ssm_i();
371 }
372
373 /* turning off interrupts can be paravirtualized simply by writing
374 * to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
375 static void
376 xen_rsm_i(void)
377 {
378 xen_set_virtual_psr_i(0);
379 barrier();
380 }
381
382 static unsigned long
383 xen_get_psr_i(void)
384 {
385 return xen_get_virtual_psr_i() ? IA64_PSR_I : 0;
386 }
387
388 static void
389 xen_intrin_local_irq_restore(unsigned long mask)
390 {
391 if (mask & IA64_PSR_I)
392 xen_ssm_i();
393 else
394 xen_rsm_i();
395 }
396 #else
397 #define __DEFINE_FUNC(name, code) \
398 extern const char xen_ ## name ## _direct_start[]; \
399 extern const char xen_ ## name ## _direct_end[]; \
400 asm (".align 32\n" \
401 ".proc xen_" #name "\n" \
402 "xen_" #name ":\n" \
403 "xen_" #name "_direct_start:\n" \
404 code \
405 "xen_" #name "_direct_end:\n" \
406 "br.cond.sptk.many b6\n" \
407 ".endp xen_" #name "\n")
408
409 #define DEFINE_VOID_FUNC0(name, code) \
410 extern void \
411 xen_ ## name (void); \
412 __DEFINE_FUNC(name, code)
413
414 #define DEFINE_VOID_FUNC1(name, code) \
415 extern void \
416 xen_ ## name (unsigned long arg); \
417 __DEFINE_FUNC(name, code)
418
419 #define DEFINE_VOID_FUNC1_VOID(name, code) \
420 extern void \
421 xen_ ## name (void *arg); \
422 __DEFINE_FUNC(name, code)
423
424 #define DEFINE_VOID_FUNC2(name, code) \
425 extern void \
426 xen_ ## name (unsigned long arg0, \
427 unsigned long arg1); \
428 __DEFINE_FUNC(name, code)
429
430 #define DEFINE_FUNC0(name, code) \
431 extern unsigned long \
432 xen_ ## name (void); \
433 __DEFINE_FUNC(name, code)
434
435 #define DEFINE_FUNC1(name, type, code) \
436 extern unsigned long \
437 xen_ ## name (type arg); \
438 __DEFINE_FUNC(name, code)
439
440 #define XEN_PSR_I_ADDR_ADDR (XSI_BASE + XSI_PSR_I_ADDR_OFS)
441
442 /*
443 * static void xen_set_itm_with_offset(unsigned long val)
444 * xen_set_itm(val - XEN_MAPPEDREGS->itc_offset);
445 */
446 /* 2 bundles */
447 DEFINE_VOID_FUNC1(set_itm_with_offset,
448 "mov r2 = " __stringify(XSI_BASE) " + "
449 __stringify(XSI_ITC_OFFSET_OFS) "\n"
450 ";;\n"
451 "ld8 r3 = [r2]\n"
452 ";;\n"
453 "sub r8 = r8, r3\n"
454 "break " __stringify(HYPERPRIVOP_SET_ITM) "\n");
455
456 /*
457 * static unsigned long xen_get_itm_with_offset(void)
458 * return ia64_native_getreg(_IA64_REG_CR_ITM) + XEN_MAPPEDREGS->itc_offset;
459 */
460 /* 2 bundles */
461 DEFINE_FUNC0(get_itm_with_offset,
462 "mov r2 = " __stringify(XSI_BASE) " + "
463 __stringify(XSI_ITC_OFFSET_OFS) "\n"
464 ";;\n"
465 "ld8 r3 = [r2]\n"
466 "mov r8 = cr.itm\n"
467 ";;\n"
468 "add r8 = r8, r2\n");
469
470 /*
471 * static void xen_set_itc(unsigned long val)
472 * unsigned long mitc;
473 *
474 * WARN_ON(!irqs_disabled());
475 * mitc = ia64_native_getreg(_IA64_REG_AR_ITC);
476 * XEN_MAPPEDREGS->itc_offset = val - mitc;
477 * XEN_MAPPEDREGS->itc_last = val;
478 */
479 /* 2 bundles */
480 DEFINE_VOID_FUNC1(set_itc,
481 "mov r2 = " __stringify(XSI_BASE) " + "
482 __stringify(XSI_ITC_LAST_OFS) "\n"
483 "mov r3 = ar.itc\n"
484 ";;\n"
485 "sub r3 = r8, r3\n"
486 "st8 [r2] = r8, "
487 __stringify(XSI_ITC_LAST_OFS) " - "
488 __stringify(XSI_ITC_OFFSET_OFS) "\n"
489 ";;\n"
490 "st8 [r2] = r3\n");
491
492 /*
493 * static unsigned long xen_get_itc(void)
494 * unsigned long res;
495 * unsigned long itc_offset;
496 * unsigned long itc_last;
497 * unsigned long ret_itc_last;
498 *
499 * itc_offset = XEN_MAPPEDREGS->itc_offset;
500 * do {
501 * itc_last = XEN_MAPPEDREGS->itc_last;
502 * res = ia64_native_getreg(_IA64_REG_AR_ITC);
503 * res += itc_offset;
504 * if (itc_last >= res)
505 * res = itc_last + 1;
506 * ret_itc_last = cmpxchg(&XEN_MAPPEDREGS->itc_last,
507 * itc_last, res);
508 * } while (unlikely(ret_itc_last != itc_last));
509 * return res;
510 */
511 /* 5 bundles */
512 DEFINE_FUNC0(get_itc,
513 "mov r2 = " __stringify(XSI_BASE) " + "
514 __stringify(XSI_ITC_OFFSET_OFS) "\n"
515 ";;\n"
516 "ld8 r9 = [r2], " __stringify(XSI_ITC_LAST_OFS) " - "
517 __stringify(XSI_ITC_OFFSET_OFS) "\n"
518 /* r9 = itc_offset */
519 /* r2 = XSI_ITC_OFFSET */
520 "888:\n"
521 "mov r8 = ar.itc\n" /* res = ar.itc */
522 ";;\n"
523 "ld8 r3 = [r2]\n" /* r3 = itc_last */
524 "add r8 = r8, r9\n" /* res = ar.itc + itc_offset */
525 ";;\n"
526 "cmp.gtu p6, p0 = r3, r8\n"
527 ";;\n"
528 "(p6) add r8 = 1, r3\n" /* if (itc_last > res) itc_last + 1 */
529 ";;\n"
530 "mov ar.ccv = r8\n"
531 ";;\n"
532 "cmpxchg8.acq r10 = [r2], r8, ar.ccv\n"
533 ";;\n"
534 "cmp.ne p6, p0 = r10, r3\n"
535 "(p6) hint @pause\n"
536 "(p6) br.cond.spnt 888b\n");
537
538 DEFINE_VOID_FUNC1_VOID(fc,
539 "break " __stringify(HYPERPRIVOP_FC) "\n");
540
541 /*
542 * psr_i_addr_addr = XEN_PSR_I_ADDR_ADDR
543 * masked_addr = *psr_i_addr_addr
544 * pending_intr_addr = masked_addr - 1
545 * if (val & IA64_PSR_I) {
546 * masked = *masked_addr
547 * *masked_addr = 0:xen_set_virtual_psr_i(1)
548 * compiler barrier
549 * if (masked) {
550 * uint8_t pending = *pending_intr_addr;
551 * if (pending)
552 * XEN_HYPER_SSM_I
553 * }
554 * } else {
555 * *masked_addr = 1:xen_set_virtual_psr_i(0)
556 * }
557 */
558 /* 6 bundles */
559 DEFINE_VOID_FUNC1(intrin_local_irq_restore,
560 /* r8 = input value: 0 or IA64_PSR_I
561 * p6 = (flags & IA64_PSR_I)
562 * = if clause
563 * p7 = !(flags & IA64_PSR_I)
564 * = else clause
565 */
566 "cmp.ne p6, p7 = r8, r0\n"
567 "mov r9 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
568 ";;\n"
569 /* r9 = XEN_PSR_I_ADDR */
570 "ld8 r9 = [r9]\n"
571 ";;\n"
572
573 /* r10 = masked previous value */
574 "(p6) ld1.acq r10 = [r9]\n"
575 ";;\n"
576
577 /* p8 = !masked interrupt masked previously? */
578 "(p6) cmp.ne.unc p8, p0 = r10, r0\n"
579
580 /* p7 = else clause */
581 "(p7) mov r11 = 1\n"
582 ";;\n"
583 /* masked = 1 */
584 "(p7) st1.rel [r9] = r11\n"
585
586 /* p6 = if clause */
587 /* masked = 0
588 * r9 = masked_addr - 1
589 * = pending_intr_addr
590 */
591 "(p8) st1.rel [r9] = r0, -1\n"
592 ";;\n"
593 /* r8 = pending_intr */
594 "(p8) ld1.acq r11 = [r9]\n"
595 ";;\n"
596 /* p9 = interrupt pending? */
597 "(p8) cmp.ne.unc p9, p10 = r11, r0\n"
598 ";;\n"
599 "(p10) mf\n"
600 /* issue hypercall to trigger interrupt */
601 "(p9) break " __stringify(HYPERPRIVOP_SSM_I) "\n");
602
603 DEFINE_VOID_FUNC2(ptcga,
604 "break " __stringify(HYPERPRIVOP_PTC_GA) "\n");
605 DEFINE_VOID_FUNC2(set_rr,
606 "break " __stringify(HYPERPRIVOP_SET_RR) "\n");
607
608 /*
609 * tmp = XEN_MAPPEDREGS->interrupt_mask_addr = XEN_PSR_I_ADDR_ADDR;
610 * tmp = *tmp
611 * tmp = *tmp;
612 * psr_i = tmp? 0: IA64_PSR_I;
613 */
614 /* 4 bundles */
615 DEFINE_FUNC0(get_psr_i,
616 "mov r9 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
617 ";;\n"
618 "ld8 r9 = [r9]\n" /* r9 = XEN_PSR_I_ADDR */
619 "mov r8 = 0\n" /* psr_i = 0 */
620 ";;\n"
621 "ld1.acq r9 = [r9]\n" /* r9 = XEN_PSR_I */
622 ";;\n"
623 "cmp.eq.unc p6, p0 = r9, r0\n" /* p6 = (XEN_PSR_I != 0) */
624 ";;\n"
625 "(p6) mov r8 = " __stringify(1 << IA64_PSR_I_BIT) "\n");
626
627 DEFINE_FUNC1(thash, unsigned long,
628 "break " __stringify(HYPERPRIVOP_THASH) "\n");
629 DEFINE_FUNC1(get_cpuid, int,
630 "break " __stringify(HYPERPRIVOP_GET_CPUID) "\n");
631 DEFINE_FUNC1(get_pmd, int,
632 "break " __stringify(HYPERPRIVOP_GET_PMD) "\n");
633 DEFINE_FUNC1(get_rr, unsigned long,
634 "break " __stringify(HYPERPRIVOP_GET_RR) "\n");
635
636 /*
637 * void xen_privop_ssm_i(void)
638 *
639 * int masked = !xen_get_virtual_psr_i();
640 * // masked = *(*XEN_MAPPEDREGS->interrupt_mask_addr)
641 * xen_set_virtual_psr_i(1)
642 * // *(*XEN_MAPPEDREGS->interrupt_mask_addr) = 0
643 * // compiler barrier
644 * if (masked) {
645 * uint8_t* pend_int_addr =
646 * (uint8_t*)(*XEN_MAPPEDREGS->interrupt_mask_addr) - 1;
647 * uint8_t pending = *pend_int_addr;
648 * if (pending)
649 * XEN_HYPER_SSM_I
650 * }
651 */
652 /* 4 bundles */
653 DEFINE_VOID_FUNC0(ssm_i,
654 "mov r8 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
655 ";;\n"
656 "ld8 r8 = [r8]\n" /* r8 = XEN_PSR_I_ADDR */
657 ";;\n"
658 "ld1.acq r9 = [r8]\n" /* r9 = XEN_PSR_I */
659 ";;\n"
660 "st1.rel [r8] = r0, -1\n" /* psr_i = 0. enable interrupt
661 * r8 = XEN_PSR_I_ADDR - 1
662 * = pend_int_addr
663 */
664 "cmp.eq.unc p0, p6 = r9, r0\n"/* p6 = !XEN_PSR_I
665 * previously interrupt
666 * masked?
667 */
668 ";;\n"
669 "(p6) ld1.acq r8 = [r8]\n" /* r8 = xen_pend_int */
670 ";;\n"
671 "(p6) cmp.eq.unc p6, p7 = r8, r0\n" /*interrupt pending?*/
672 ";;\n"
673 /* issue hypercall to get interrupt */
674 "(p7) break " __stringify(HYPERPRIVOP_SSM_I) "\n"
675 ";;\n");
676
677 /*
678 * psr_i_addr_addr = XEN_MAPPEDREGS->interrupt_mask_addr
679 * = XEN_PSR_I_ADDR_ADDR;
680 * psr_i_addr = *psr_i_addr_addr;
681 * *psr_i_addr = 1;
682 */
683 /* 2 bundles */
684 DEFINE_VOID_FUNC0(rsm_i,
685 "mov r8 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
686 /* r8 = XEN_PSR_I_ADDR */
687 "mov r9 = 1\n"
688 ";;\n"
689 "ld8 r8 = [r8]\n" /* r8 = XEN_PSR_I */
690 ";;\n"
691 "st1.rel [r8] = r9\n"); /* XEN_PSR_I = 1 */
692
693 extern void
694 xen_set_rr0_to_rr4(unsigned long val0, unsigned long val1,
695 unsigned long val2, unsigned long val3,
696 unsigned long val4);
697 __DEFINE_FUNC(set_rr0_to_rr4,
698 "break " __stringify(HYPERPRIVOP_SET_RR0_TO_RR4) "\n");
699
700
701 extern unsigned long xen_getreg(int regnum);
702 #define __DEFINE_GET_REG(id, privop) \
703 "mov r2 = " __stringify(_IA64_REG_ ## id) "\n" \
704 ";;\n" \
705 "cmp.eq p6, p0 = r2, r8\n" \
706 ";;\n" \
707 "(p6) break " __stringify(HYPERPRIVOP_GET_ ## privop) "\n" \
708 "(p6) br.cond.sptk.many b6\n" \
709 ";;\n"
710
711 __DEFINE_FUNC(getreg,
712 __DEFINE_GET_REG(PSR, PSR)
713 #ifdef CONFIG_IA32_SUPPORT
714 __DEFINE_GET_REG(AR_EFLAG, EFLAG)
715 #endif
716
717 /* get_itc */
718 "mov r2 = " __stringify(_IA64_REG_AR_ITC) "\n"
719 ";;\n"
720 "cmp.eq p6, p0 = r2, r8\n"
721 ";;\n"
722 "(p6) br.cond.spnt xen_get_itc\n"
723 ";;\n"
724
725 /* get itm */
726 "mov r2 = " __stringify(_IA64_REG_CR_ITM) "\n"
727 ";;\n"
728 "cmp.eq p6, p0 = r2, r8\n"
729 ";;\n"
730 "(p6) br.cond.spnt xen_get_itm_with_offset\n"
731 ";;\n"
732
733 __DEFINE_GET_REG(CR_IVR, IVR)
734 __DEFINE_GET_REG(CR_TPR, TPR)
735
736 /* fall back */
737 "movl r2 = ia64_native_getreg_func\n"
738 ";;\n"
739 "mov b7 = r2\n"
740 ";;\n"
741 "br.cond.sptk.many b7\n");
742
743 extern void xen_setreg(int regnum, unsigned long val);
744 #define __DEFINE_SET_REG(id, privop) \
745 "mov r2 = " __stringify(_IA64_REG_ ## id) "\n" \
746 ";;\n" \
747 "cmp.eq p6, p0 = r2, r9\n" \
748 ";;\n" \
749 "(p6) break " __stringify(HYPERPRIVOP_ ## privop) "\n" \
750 "(p6) br.cond.sptk.many b6\n" \
751 ";;\n"
752
753 __DEFINE_FUNC(setreg,
754 /* kr0 .. kr 7*/
755 /*
756 * if (_IA64_REG_AR_KR0 <= regnum &&
757 * regnum <= _IA64_REG_AR_KR7) {
758 * register __index asm ("r8") = regnum - _IA64_REG_AR_KR0
759 * register __val asm ("r9") = val
760 * "break HYPERPRIVOP_SET_KR"
761 * }
762 */
763 "mov r17 = r9\n"
764 "mov r2 = " __stringify(_IA64_REG_AR_KR0) "\n"
765 ";;\n"
766 "cmp.ge p6, p0 = r9, r2\n"
767 "sub r17 = r17, r2\n"
768 ";;\n"
769 "(p6) cmp.ge.unc p7, p0 = "
770 __stringify(_IA64_REG_AR_KR7) " - " __stringify(_IA64_REG_AR_KR0)
771 ", r17\n"
772 ";;\n"
773 "(p7) mov r9 = r8\n"
774 ";;\n"
775 "(p7) mov r8 = r17\n"
776 "(p7) break " __stringify(HYPERPRIVOP_SET_KR) "\n"
777
778 /* set itm */
779 "mov r2 = " __stringify(_IA64_REG_CR_ITM) "\n"
780 ";;\n"
781 "cmp.eq p6, p0 = r2, r8\n"
782 ";;\n"
783 "(p6) br.cond.spnt xen_set_itm_with_offset\n"
784
785 /* set itc */
786 "mov r2 = " __stringify(_IA64_REG_AR_ITC) "\n"
787 ";;\n"
788 "cmp.eq p6, p0 = r2, r8\n"
789 ";;\n"
790 "(p6) br.cond.spnt xen_set_itc\n"
791
792 #ifdef CONFIG_IA32_SUPPORT
793 __DEFINE_SET_REG(AR_EFLAG, SET_EFLAG)
794 #endif
795 __DEFINE_SET_REG(CR_TPR, SET_TPR)
796 __DEFINE_SET_REG(CR_EOI, EOI)
797
798 /* fall back */
799 "movl r2 = ia64_native_setreg_func\n"
800 ";;\n"
801 "mov b7 = r2\n"
802 ";;\n"
803 "br.cond.sptk.many b7\n");
804 #endif
805
806 static const struct pv_cpu_ops xen_cpu_ops __initconst = {
807 .fc = xen_fc,
808 .thash = xen_thash,
809 .get_cpuid = xen_get_cpuid,
810 .get_pmd = xen_get_pmd,
811 .getreg = xen_getreg,
812 .setreg = xen_setreg,
813 .ptcga = xen_ptcga,
814 .get_rr = xen_get_rr,
815 .set_rr = xen_set_rr,
816 .set_rr0_to_rr4 = xen_set_rr0_to_rr4,
817 .ssm_i = xen_ssm_i,
818 .rsm_i = xen_rsm_i,
819 .get_psr_i = xen_get_psr_i,
820 .intrin_local_irq_restore
821 = xen_intrin_local_irq_restore,
822 };
823
824 /******************************************************************************
825 * replacement of hand written assembly codes.
826 */
827
828 extern char xen_switch_to;
829 extern char xen_leave_syscall;
830 extern char xen_work_processed_syscall;
831 extern char xen_leave_kernel;
832
833 const struct pv_cpu_asm_switch xen_cpu_asm_switch = {
834 .switch_to = (unsigned long)&xen_switch_to,
835 .leave_syscall = (unsigned long)&xen_leave_syscall,
836 .work_processed_syscall = (unsigned long)&xen_work_processed_syscall,
837 .leave_kernel = (unsigned long)&xen_leave_kernel,
838 };
839
840 /***************************************************************************
841 * pv_iosapic_ops
842 * iosapic read/write hooks.
843 */
844 static void
845 xen_pcat_compat_init(void)
846 {
847 /* nothing */
848 }
849
850 static struct irq_chip*
851 xen_iosapic_get_irq_chip(unsigned long trigger)
852 {
853 return NULL;
854 }
855
856 static unsigned int
857 xen_iosapic_read(char __iomem *iosapic, unsigned int reg)
858 {
859 struct physdev_apic apic_op;
860 int ret;
861
862 apic_op.apic_physbase = (unsigned long)iosapic -
863 __IA64_UNCACHED_OFFSET;
864 apic_op.reg = reg;
865 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
866 if (ret)
867 return ret;
868 return apic_op.value;
869 }
870
871 static void
872 xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
873 {
874 struct physdev_apic apic_op;
875
876 apic_op.apic_physbase = (unsigned long)iosapic -
877 __IA64_UNCACHED_OFFSET;
878 apic_op.reg = reg;
879 apic_op.value = val;
880 HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
881 }
882
883 static struct pv_iosapic_ops xen_iosapic_ops __initdata = {
884 .pcat_compat_init = xen_pcat_compat_init,
885 .__get_irq_chip = xen_iosapic_get_irq_chip,
886
887 .__read = xen_iosapic_read,
888 .__write = xen_iosapic_write,
889 };
890
891 /***************************************************************************
892 * pv_ops initialization
893 */
894
895 void __init
896 xen_setup_pv_ops(void)
897 {
898 xen_info_init();
899 pv_info = xen_info;
900 pv_init_ops = xen_init_ops;
901 pv_fsys_data = xen_fsys_data;
902 pv_patchdata = xen_patchdata;
903 pv_cpu_ops = xen_cpu_ops;
904 pv_iosapic_ops = xen_iosapic_ops;
905 pv_irq_ops = xen_irq_ops;
906 pv_time_ops = xen_time_ops;
907
908 paravirt_cpu_asm_init(&xen_cpu_asm_switch);
909 }
910
911 #ifdef ASM_SUPPORTED
912 /***************************************************************************
913 * binary pacthing
914 * pv_init_ops.patch_bundle
915 */
916
917 #define DEFINE_FUNC_GETREG(name, privop) \
918 DEFINE_FUNC0(get_ ## name, \
919 "break "__stringify(HYPERPRIVOP_GET_ ## privop) "\n")
920
921 DEFINE_FUNC_GETREG(psr, PSR);
922 DEFINE_FUNC_GETREG(eflag, EFLAG);
923 DEFINE_FUNC_GETREG(ivr, IVR);
924 DEFINE_FUNC_GETREG(tpr, TPR);
925
926 #define DEFINE_FUNC_SET_KR(n) \
927 DEFINE_VOID_FUNC0(set_kr ## n, \
928 ";;\n" \
929 "mov r9 = r8\n" \
930 "mov r8 = " #n "\n" \
931 "break " __stringify(HYPERPRIVOP_SET_KR) "\n")
932
933 DEFINE_FUNC_SET_KR(0);
934 DEFINE_FUNC_SET_KR(1);
935 DEFINE_FUNC_SET_KR(2);
936 DEFINE_FUNC_SET_KR(3);
937 DEFINE_FUNC_SET_KR(4);
938 DEFINE_FUNC_SET_KR(5);
939 DEFINE_FUNC_SET_KR(6);
940 DEFINE_FUNC_SET_KR(7);
941
942 #define __DEFINE_FUNC_SETREG(name, privop) \
943 DEFINE_VOID_FUNC0(name, \
944 "break "__stringify(HYPERPRIVOP_ ## privop) "\n")
945
946 #define DEFINE_FUNC_SETREG(name, privop) \
947 __DEFINE_FUNC_SETREG(set_ ## name, SET_ ## privop)
948
949 DEFINE_FUNC_SETREG(eflag, EFLAG);
950 DEFINE_FUNC_SETREG(tpr, TPR);
951 __DEFINE_FUNC_SETREG(eoi, EOI);
952
953 extern const char xen_check_events[];
954 extern const char __xen_intrin_local_irq_restore_direct_start[];
955 extern const char __xen_intrin_local_irq_restore_direct_end[];
956 extern const unsigned long __xen_intrin_local_irq_restore_direct_reloc;
957
958 asm (
959 ".align 32\n"
960 ".proc xen_check_events\n"
961 "xen_check_events:\n"
962 /* masked = 0
963 * r9 = masked_addr - 1
964 * = pending_intr_addr
965 */
966 "st1.rel [r9] = r0, -1\n"
967 ";;\n"
968 /* r8 = pending_intr */
969 "ld1.acq r11 = [r9]\n"
970 ";;\n"
971 /* p9 = interrupt pending? */
972 "cmp.ne p9, p10 = r11, r0\n"
973 ";;\n"
974 "(p10) mf\n"
975 /* issue hypercall to trigger interrupt */
976 "(p9) break " __stringify(HYPERPRIVOP_SSM_I) "\n"
977 "br.cond.sptk.many b6\n"
978 ".endp xen_check_events\n"
979 "\n"
980 ".align 32\n"
981 ".proc __xen_intrin_local_irq_restore_direct\n"
982 "__xen_intrin_local_irq_restore_direct:\n"
983 "__xen_intrin_local_irq_restore_direct_start:\n"
984 "1:\n"
985 "{\n"
986 "cmp.ne p6, p7 = r8, r0\n"
987 "mov r17 = ip\n" /* get ip to calc return address */
988 "mov r9 = "__stringify(XEN_PSR_I_ADDR_ADDR) "\n"
989 ";;\n"
990 "}\n"
991 "{\n"
992 /* r9 = XEN_PSR_I_ADDR */
993 "ld8 r9 = [r9]\n"
994 ";;\n"
995 /* r10 = masked previous value */
996 "(p6) ld1.acq r10 = [r9]\n"
997 "adds r17 = 1f - 1b, r17\n" /* calculate return address */
998 ";;\n"
999 "}\n"
1000 "{\n"
1001 /* p8 = !masked interrupt masked previously? */
1002 "(p6) cmp.ne.unc p8, p0 = r10, r0\n"
1003 "\n"
1004 /* p7 = else clause */
1005 "(p7) mov r11 = 1\n"
1006 ";;\n"
1007 "(p8) mov b6 = r17\n" /* set return address */
1008 "}\n"
1009 "{\n"
1010 /* masked = 1 */
1011 "(p7) st1.rel [r9] = r11\n"
1012 "\n"
1013 "[99:]\n"
1014 "(p8) brl.cond.dptk.few xen_check_events\n"
1015 "}\n"
1016 /* pv calling stub is 5 bundles. fill nop to adjust return address */
1017 "{\n"
1018 "nop 0\n"
1019 "nop 0\n"
1020 "nop 0\n"
1021 "}\n"
1022 "1:\n"
1023 "__xen_intrin_local_irq_restore_direct_end:\n"
1024 ".endp __xen_intrin_local_irq_restore_direct\n"
1025 "\n"
1026 ".align 8\n"
1027 "__xen_intrin_local_irq_restore_direct_reloc:\n"
1028 "data8 99b\n"
1029 );
1030
1031 static struct paravirt_patch_bundle_elem xen_patch_bundle_elems[]
1032 __initdata_or_module =
1033 {
1034 #define XEN_PATCH_BUNDLE_ELEM(name, type) \
1035 { \
1036 (void*)xen_ ## name ## _direct_start, \
1037 (void*)xen_ ## name ## _direct_end, \
1038 PARAVIRT_PATCH_TYPE_ ## type, \
1039 }
1040
1041 XEN_PATCH_BUNDLE_ELEM(fc, FC),
1042 XEN_PATCH_BUNDLE_ELEM(thash, THASH),
1043 XEN_PATCH_BUNDLE_ELEM(get_cpuid, GET_CPUID),
1044 XEN_PATCH_BUNDLE_ELEM(get_pmd, GET_PMD),
1045 XEN_PATCH_BUNDLE_ELEM(ptcga, PTCGA),
1046 XEN_PATCH_BUNDLE_ELEM(get_rr, GET_RR),
1047 XEN_PATCH_BUNDLE_ELEM(set_rr, SET_RR),
1048 XEN_PATCH_BUNDLE_ELEM(set_rr0_to_rr4, SET_RR0_TO_RR4),
1049 XEN_PATCH_BUNDLE_ELEM(ssm_i, SSM_I),
1050 XEN_PATCH_BUNDLE_ELEM(rsm_i, RSM_I),
1051 XEN_PATCH_BUNDLE_ELEM(get_psr_i, GET_PSR_I),
1052 {
1053 (void*)__xen_intrin_local_irq_restore_direct_start,
1054 (void*)__xen_intrin_local_irq_restore_direct_end,
1055 PARAVIRT_PATCH_TYPE_INTRIN_LOCAL_IRQ_RESTORE,
1056 },
1057
1058 #define XEN_PATCH_BUNDLE_ELEM_GETREG(name, reg) \
1059 { \
1060 xen_get_ ## name ## _direct_start, \
1061 xen_get_ ## name ## _direct_end, \
1062 PARAVIRT_PATCH_TYPE_GETREG + _IA64_REG_ ## reg, \
1063 }
1064
1065 XEN_PATCH_BUNDLE_ELEM_GETREG(psr, PSR),
1066 XEN_PATCH_BUNDLE_ELEM_GETREG(eflag, AR_EFLAG),
1067
1068 XEN_PATCH_BUNDLE_ELEM_GETREG(ivr, CR_IVR),
1069 XEN_PATCH_BUNDLE_ELEM_GETREG(tpr, CR_TPR),
1070
1071 XEN_PATCH_BUNDLE_ELEM_GETREG(itc, AR_ITC),
1072 XEN_PATCH_BUNDLE_ELEM_GETREG(itm_with_offset, CR_ITM),
1073
1074
1075 #define __XEN_PATCH_BUNDLE_ELEM_SETREG(name, reg) \
1076 { \
1077 xen_ ## name ## _direct_start, \
1078 xen_ ## name ## _direct_end, \
1079 PARAVIRT_PATCH_TYPE_SETREG + _IA64_REG_ ## reg, \
1080 }
1081
1082 #define XEN_PATCH_BUNDLE_ELEM_SETREG(name, reg) \
1083 __XEN_PATCH_BUNDLE_ELEM_SETREG(set_ ## name, reg)
1084
1085 XEN_PATCH_BUNDLE_ELEM_SETREG(kr0, AR_KR0),
1086 XEN_PATCH_BUNDLE_ELEM_SETREG(kr1, AR_KR1),
1087 XEN_PATCH_BUNDLE_ELEM_SETREG(kr2, AR_KR2),
1088 XEN_PATCH_BUNDLE_ELEM_SETREG(kr3, AR_KR3),
1089 XEN_PATCH_BUNDLE_ELEM_SETREG(kr4, AR_KR4),
1090 XEN_PATCH_BUNDLE_ELEM_SETREG(kr5, AR_KR5),
1091 XEN_PATCH_BUNDLE_ELEM_SETREG(kr6, AR_KR6),
1092 XEN_PATCH_BUNDLE_ELEM_SETREG(kr7, AR_KR7),
1093
1094 XEN_PATCH_BUNDLE_ELEM_SETREG(eflag, AR_EFLAG),
1095 XEN_PATCH_BUNDLE_ELEM_SETREG(tpr, CR_TPR),
1096 __XEN_PATCH_BUNDLE_ELEM_SETREG(eoi, CR_EOI),
1097
1098 XEN_PATCH_BUNDLE_ELEM_SETREG(itc, AR_ITC),
1099 XEN_PATCH_BUNDLE_ELEM_SETREG(itm_with_offset, CR_ITM),
1100 };
1101
1102 static unsigned long __init_or_module
1103 xen_patch_bundle(void *sbundle, void *ebundle, unsigned long type)
1104 {
1105 const unsigned long nelems = sizeof(xen_patch_bundle_elems) /
1106 sizeof(xen_patch_bundle_elems[0]);
1107 unsigned long used;
1108 const struct paravirt_patch_bundle_elem *found;
1109
1110 used = __paravirt_patch_apply_bundle(sbundle, ebundle, type,
1111 xen_patch_bundle_elems, nelems,
1112 &found);
1113
1114 if (found == NULL)
1115 /* fallback */
1116 return ia64_native_patch_bundle(sbundle, ebundle, type);
1117 if (used == 0)
1118 return used;
1119
1120 /* relocation */
1121 switch (type) {
1122 case PARAVIRT_PATCH_TYPE_INTRIN_LOCAL_IRQ_RESTORE: {
1123 unsigned long reloc =
1124 __xen_intrin_local_irq_restore_direct_reloc;
1125 unsigned long reloc_offset = reloc - (unsigned long)
1126 __xen_intrin_local_irq_restore_direct_start;
1127 unsigned long tag = (unsigned long)sbundle + reloc_offset;
1128 paravirt_patch_reloc_brl(tag, xen_check_events);
1129 break;
1130 }
1131 default:
1132 /* nothing */
1133 break;
1134 }
1135 return used;
1136 }
1137 #endif /* ASM_SUPPOTED */
1138
1139 const struct paravirt_patch_branch_target xen_branch_target[]
1140 __initconst = {
1141 #define PARAVIRT_BR_TARGET(name, type) \
1142 { \
1143 &xen_ ## name, \
1144 PARAVIRT_PATCH_TYPE_BR_ ## type, \
1145 }
1146 PARAVIRT_BR_TARGET(switch_to, SWITCH_TO),
1147 PARAVIRT_BR_TARGET(leave_syscall, LEAVE_SYSCALL),
1148 PARAVIRT_BR_TARGET(work_processed_syscall, WORK_PROCESSED_SYSCALL),
1149 PARAVIRT_BR_TARGET(leave_kernel, LEAVE_KERNEL),
1150 };
1151
1152 static void __init
1153 xen_patch_branch(unsigned long tag, unsigned long type)
1154 {
1155 const unsigned long nelem =
1156 sizeof(xen_branch_target) / sizeof(xen_branch_target[0]);
1157 __paravirt_patch_apply_branch(tag, type, xen_branch_target, nelem);
1158 }
Support for the Chinese Samsung S3C2440 based development boards