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
xen_info_init(void)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
xen_panic_hypercall(struct unw_frame_info * info,void * arg)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
xen_panic_event(struct notifier_block * this,unsigned long event,void * ptr)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
xen_pm_power_off(void)85 static void xen_pm_power_off(void)
86 {
87 local_irq_disable();
88 HYPERVISOR_shutdown(SHUTDOWN_poweroff);
89 }
90
91 static void __init
xen_banner(void)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
xen_reserve_memory(struct rsvd_region * region)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
xen_arch_setup_early(void)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
xen_arch_setup_console(char ** cmdline_p)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
xen_arch_setup_nomca(void)146 xen_arch_setup_nomca(void)
147 {
148 return 1;
149 }
150
151 static void __init
xen_post_smp_prepare_boot_cpu(void)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
xen_set_itm_with_offset(unsigned long val)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
xen_get_itm_with_offset(void)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
xen_set_itc(unsigned long val)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
xen_get_itc(void)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
xen_setreg(int regnum,unsigned long val)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 case _IA64_REG_AR_ITC:
305 xen_set_itc(val);
306 break;
307 case _IA64_REG_CR_TPR:
308 xen_set_tpr(val);
309 break;
310 case _IA64_REG_CR_ITM:
311 xen_set_itm_with_offset(val);
312 break;
313 case _IA64_REG_CR_EOI:
314 xen_eoi(val);
315 break;
316 default:
317 ia64_native_setreg_func(regnum, val);
318 break;
319 }
320 }
321
xen_getreg(int regnum)322 static unsigned long xen_getreg(int regnum)
323 {
324 unsigned long res;
325
326 switch (regnum) {
327 case _IA64_REG_PSR:
328 res = xen_get_psr();
329 break;
330 case _IA64_REG_AR_ITC:
331 res = xen_get_itc();
332 break;
333 case _IA64_REG_CR_ITM:
334 res = xen_get_itm_with_offset();
335 break;
336 case _IA64_REG_CR_IVR:
337 res = xen_get_ivr();
338 break;
339 case _IA64_REG_CR_TPR:
340 res = xen_get_tpr();
341 break;
342 default:
343 res = ia64_native_getreg_func(regnum);
344 break;
345 }
346 return res;
347 }
348
349 /* turning on interrupts is a bit more complicated.. write to the
350 * memory-mapped virtual psr.i bit first (to avoid race condition),
351 * then if any interrupts were pending, we have to execute a hyperprivop
352 * to ensure the pending interrupt gets delivered; else we're done! */
353 static void
xen_ssm_i(void)354 xen_ssm_i(void)
355 {
356 int old = xen_get_virtual_psr_i();
357 xen_set_virtual_psr_i(1);
358 barrier();
359 if (!old && xen_get_virtual_pend())
360 xen_hyper_ssm_i();
361 }
362
363 /* turning off interrupts can be paravirtualized simply by writing
364 * to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
365 static void
xen_rsm_i(void)366 xen_rsm_i(void)
367 {
368 xen_set_virtual_psr_i(0);
369 barrier();
370 }
371
372 static unsigned long
xen_get_psr_i(void)373 xen_get_psr_i(void)
374 {
375 return xen_get_virtual_psr_i() ? IA64_PSR_I : 0;
376 }
377
378 static void
xen_intrin_local_irq_restore(unsigned long mask)379 xen_intrin_local_irq_restore(unsigned long mask)
380 {
381 if (mask & IA64_PSR_I)
382 xen_ssm_i();
383 else
384 xen_rsm_i();
385 }
386 #else
387 #define __DEFINE_FUNC(name, code) \
388 extern const char xen_ ## name ## _direct_start[]; \
389 extern const char xen_ ## name ## _direct_end[]; \
390 asm (".align 32\n" \
391 ".proc xen_" #name "\n" \
392 "xen_" #name ":\n" \
393 "xen_" #name "_direct_start:\n" \
394 code \
395 "xen_" #name "_direct_end:\n" \
396 "br.cond.sptk.many b6\n" \
397 ".endp xen_" #name "\n")
398
399 #define DEFINE_VOID_FUNC0(name, code) \
400 extern void \
401 xen_ ## name (void); \
402 __DEFINE_FUNC(name, code)
403
404 #define DEFINE_VOID_FUNC1(name, code) \
405 extern void \
406 xen_ ## name (unsigned long arg); \
407 __DEFINE_FUNC(name, code)
408
409 #define DEFINE_VOID_FUNC1_VOID(name, code) \
410 extern void \
411 xen_ ## name (void *arg); \
412 __DEFINE_FUNC(name, code)
413
414 #define DEFINE_VOID_FUNC2(name, code) \
415 extern void \
416 xen_ ## name (unsigned long arg0, \
417 unsigned long arg1); \
418 __DEFINE_FUNC(name, code)
419
420 #define DEFINE_FUNC0(name, code) \
421 extern unsigned long \
422 xen_ ## name (void); \
423 __DEFINE_FUNC(name, code)
424
425 #define DEFINE_FUNC1(name, type, code) \
426 extern unsigned long \
427 xen_ ## name (type arg); \
428 __DEFINE_FUNC(name, code)
429
430 #define XEN_PSR_I_ADDR_ADDR (XSI_BASE + XSI_PSR_I_ADDR_OFS)
431
432 /*
433 * static void xen_set_itm_with_offset(unsigned long val)
434 * xen_set_itm(val - XEN_MAPPEDREGS->itc_offset);
435 */
436 /* 2 bundles */
437 DEFINE_VOID_FUNC1(set_itm_with_offset,
438 "mov r2 = " __stringify(XSI_BASE) " + "
439 __stringify(XSI_ITC_OFFSET_OFS) "\n"
440 ";;\n"
441 "ld8 r3 = [r2]\n"
442 ";;\n"
443 "sub r8 = r8, r3\n"
444 "break " __stringify(HYPERPRIVOP_SET_ITM) "\n");
445
446 /*
447 * static unsigned long xen_get_itm_with_offset(void)
448 * return ia64_native_getreg(_IA64_REG_CR_ITM) + XEN_MAPPEDREGS->itc_offset;
449 */
450 /* 2 bundles */
451 DEFINE_FUNC0(get_itm_with_offset,
452 "mov r2 = " __stringify(XSI_BASE) " + "
453 __stringify(XSI_ITC_OFFSET_OFS) "\n"
454 ";;\n"
455 "ld8 r3 = [r2]\n"
456 "mov r8 = cr.itm\n"
457 ";;\n"
458 "add r8 = r8, r2\n");
459
460 /*
461 * static void xen_set_itc(unsigned long val)
462 * unsigned long mitc;
463 *
464 * WARN_ON(!irqs_disabled());
465 * mitc = ia64_native_getreg(_IA64_REG_AR_ITC);
466 * XEN_MAPPEDREGS->itc_offset = val - mitc;
467 * XEN_MAPPEDREGS->itc_last = val;
468 */
469 /* 2 bundles */
470 DEFINE_VOID_FUNC1(set_itc,
471 "mov r2 = " __stringify(XSI_BASE) " + "
472 __stringify(XSI_ITC_LAST_OFS) "\n"
473 "mov r3 = ar.itc\n"
474 ";;\n"
475 "sub r3 = r8, r3\n"
476 "st8 [r2] = r8, "
477 __stringify(XSI_ITC_LAST_OFS) " - "
478 __stringify(XSI_ITC_OFFSET_OFS) "\n"
479 ";;\n"
480 "st8 [r2] = r3\n");
481
482 /*
483 * static unsigned long xen_get_itc(void)
484 * unsigned long res;
485 * unsigned long itc_offset;
486 * unsigned long itc_last;
487 * unsigned long ret_itc_last;
488 *
489 * itc_offset = XEN_MAPPEDREGS->itc_offset;
490 * do {
491 * itc_last = XEN_MAPPEDREGS->itc_last;
492 * res = ia64_native_getreg(_IA64_REG_AR_ITC);
493 * res += itc_offset;
494 * if (itc_last >= res)
495 * res = itc_last + 1;
496 * ret_itc_last = cmpxchg(&XEN_MAPPEDREGS->itc_last,
497 * itc_last, res);
498 * } while (unlikely(ret_itc_last != itc_last));
499 * return res;
500 */
501 /* 5 bundles */
502 DEFINE_FUNC0(get_itc,
503 "mov r2 = " __stringify(XSI_BASE) " + "
504 __stringify(XSI_ITC_OFFSET_OFS) "\n"
505 ";;\n"
506 "ld8 r9 = [r2], " __stringify(XSI_ITC_LAST_OFS) " - "
507 __stringify(XSI_ITC_OFFSET_OFS) "\n"
508 /* r9 = itc_offset */
509 /* r2 = XSI_ITC_OFFSET */
510 "888:\n"
511 "mov r8 = ar.itc\n" /* res = ar.itc */
512 ";;\n"
513 "ld8 r3 = [r2]\n" /* r3 = itc_last */
514 "add r8 = r8, r9\n" /* res = ar.itc + itc_offset */
515 ";;\n"
516 "cmp.gtu p6, p0 = r3, r8\n"
517 ";;\n"
518 "(p6) add r8 = 1, r3\n" /* if (itc_last > res) itc_last + 1 */
519 ";;\n"
520 "mov ar.ccv = r8\n"
521 ";;\n"
522 "cmpxchg8.acq r10 = [r2], r8, ar.ccv\n"
523 ";;\n"
524 "cmp.ne p6, p0 = r10, r3\n"
525 "(p6) hint @pause\n"
526 "(p6) br.cond.spnt 888b\n");
527
528 DEFINE_VOID_FUNC1_VOID(fc,
529 "break " __stringify(HYPERPRIVOP_FC) "\n");
530
531 /*
532 * psr_i_addr_addr = XEN_PSR_I_ADDR_ADDR
533 * masked_addr = *psr_i_addr_addr
534 * pending_intr_addr = masked_addr - 1
535 * if (val & IA64_PSR_I) {
536 * masked = *masked_addr
537 * *masked_addr = 0:xen_set_virtual_psr_i(1)
538 * compiler barrier
539 * if (masked) {
540 * uint8_t pending = *pending_intr_addr;
541 * if (pending)
542 * XEN_HYPER_SSM_I
543 * }
544 * } else {
545 * *masked_addr = 1:xen_set_virtual_psr_i(0)
546 * }
547 */
548 /* 6 bundles */
549 DEFINE_VOID_FUNC1(intrin_local_irq_restore,
550 /* r8 = input value: 0 or IA64_PSR_I
551 * p6 = (flags & IA64_PSR_I)
552 * = if clause
553 * p7 = !(flags & IA64_PSR_I)
554 * = else clause
555 */
556 "cmp.ne p6, p7 = r8, r0\n"
557 "mov r9 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
558 ";;\n"
559 /* r9 = XEN_PSR_I_ADDR */
560 "ld8 r9 = [r9]\n"
561 ";;\n"
562
563 /* r10 = masked previous value */
564 "(p6) ld1.acq r10 = [r9]\n"
565 ";;\n"
566
567 /* p8 = !masked interrupt masked previously? */
568 "(p6) cmp.ne.unc p8, p0 = r10, r0\n"
569
570 /* p7 = else clause */
571 "(p7) mov r11 = 1\n"
572 ";;\n"
573 /* masked = 1 */
574 "(p7) st1.rel [r9] = r11\n"
575
576 /* p6 = if clause */
577 /* masked = 0
578 * r9 = masked_addr - 1
579 * = pending_intr_addr
580 */
581 "(p8) st1.rel [r9] = r0, -1\n"
582 ";;\n"
583 /* r8 = pending_intr */
584 "(p8) ld1.acq r11 = [r9]\n"
585 ";;\n"
586 /* p9 = interrupt pending? */
587 "(p8) cmp.ne.unc p9, p10 = r11, r0\n"
588 ";;\n"
589 "(p10) mf\n"
590 /* issue hypercall to trigger interrupt */
591 "(p9) break " __stringify(HYPERPRIVOP_SSM_I) "\n");
592
593 DEFINE_VOID_FUNC2(ptcga,
594 "break " __stringify(HYPERPRIVOP_PTC_GA) "\n");
595 DEFINE_VOID_FUNC2(set_rr,
596 "break " __stringify(HYPERPRIVOP_SET_RR) "\n");
597
598 /*
599 * tmp = XEN_MAPPEDREGS->interrupt_mask_addr = XEN_PSR_I_ADDR_ADDR;
600 * tmp = *tmp
601 * tmp = *tmp;
602 * psr_i = tmp? 0: IA64_PSR_I;
603 */
604 /* 4 bundles */
605 DEFINE_FUNC0(get_psr_i,
606 "mov r9 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
607 ";;\n"
608 "ld8 r9 = [r9]\n" /* r9 = XEN_PSR_I_ADDR */
609 "mov r8 = 0\n" /* psr_i = 0 */
610 ";;\n"
611 "ld1.acq r9 = [r9]\n" /* r9 = XEN_PSR_I */
612 ";;\n"
613 "cmp.eq.unc p6, p0 = r9, r0\n" /* p6 = (XEN_PSR_I != 0) */
614 ";;\n"
615 "(p6) mov r8 = " __stringify(1 << IA64_PSR_I_BIT) "\n");
616
617 DEFINE_FUNC1(thash, unsigned long,
618 "break " __stringify(HYPERPRIVOP_THASH) "\n");
619 DEFINE_FUNC1(get_cpuid, int,
620 "break " __stringify(HYPERPRIVOP_GET_CPUID) "\n");
621 DEFINE_FUNC1(get_pmd, int,
622 "break " __stringify(HYPERPRIVOP_GET_PMD) "\n");
623 DEFINE_FUNC1(get_rr, unsigned long,
624 "break " __stringify(HYPERPRIVOP_GET_RR) "\n");
625
626 /*
627 * void xen_privop_ssm_i(void)
628 *
629 * int masked = !xen_get_virtual_psr_i();
630 * // masked = *(*XEN_MAPPEDREGS->interrupt_mask_addr)
631 * xen_set_virtual_psr_i(1)
632 * // *(*XEN_MAPPEDREGS->interrupt_mask_addr) = 0
633 * // compiler barrier
634 * if (masked) {
635 * uint8_t* pend_int_addr =
636 * (uint8_t*)(*XEN_MAPPEDREGS->interrupt_mask_addr) - 1;
637 * uint8_t pending = *pend_int_addr;
638 * if (pending)
639 * XEN_HYPER_SSM_I
640 * }
641 */
642 /* 4 bundles */
643 DEFINE_VOID_FUNC0(ssm_i,
644 "mov r8 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
645 ";;\n"
646 "ld8 r8 = [r8]\n" /* r8 = XEN_PSR_I_ADDR */
647 ";;\n"
648 "ld1.acq r9 = [r8]\n" /* r9 = XEN_PSR_I */
649 ";;\n"
650 "st1.rel [r8] = r0, -1\n" /* psr_i = 0. enable interrupt
651 * r8 = XEN_PSR_I_ADDR - 1
652 * = pend_int_addr
653 */
654 "cmp.eq.unc p0, p6 = r9, r0\n"/* p6 = !XEN_PSR_I
655 * previously interrupt
656 * masked?
657 */
658 ";;\n"
659 "(p6) ld1.acq r8 = [r8]\n" /* r8 = xen_pend_int */
660 ";;\n"
661 "(p6) cmp.eq.unc p6, p7 = r8, r0\n" /*interrupt pending?*/
662 ";;\n"
663 /* issue hypercall to get interrupt */
664 "(p7) break " __stringify(HYPERPRIVOP_SSM_I) "\n"
665 ";;\n");
666
667 /*
668 * psr_i_addr_addr = XEN_MAPPEDREGS->interrupt_mask_addr
669 * = XEN_PSR_I_ADDR_ADDR;
670 * psr_i_addr = *psr_i_addr_addr;
671 * *psr_i_addr = 1;
672 */
673 /* 2 bundles */
674 DEFINE_VOID_FUNC0(rsm_i,
675 "mov r8 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
676 /* r8 = XEN_PSR_I_ADDR */
677 "mov r9 = 1\n"
678 ";;\n"
679 "ld8 r8 = [r8]\n" /* r8 = XEN_PSR_I */
680 ";;\n"
681 "st1.rel [r8] = r9\n"); /* XEN_PSR_I = 1 */
682
683 extern void
684 xen_set_rr0_to_rr4(unsigned long val0, unsigned long val1,
685 unsigned long val2, unsigned long val3,
686 unsigned long val4);
687 __DEFINE_FUNC(set_rr0_to_rr4,
688 "break " __stringify(HYPERPRIVOP_SET_RR0_TO_RR4) "\n");
689
690
691 extern unsigned long xen_getreg(int regnum);
692 #define __DEFINE_GET_REG(id, privop) \
693 "mov r2 = " __stringify(_IA64_REG_ ## id) "\n" \
694 ";;\n" \
695 "cmp.eq p6, p0 = r2, r8\n" \
696 ";;\n" \
697 "(p6) break " __stringify(HYPERPRIVOP_GET_ ## privop) "\n" \
698 "(p6) br.cond.sptk.many b6\n" \
699 ";;\n"
700
701 __DEFINE_FUNC(getreg,
702 __DEFINE_GET_REG(PSR, PSR)
703
704 /* get_itc */
705 "mov r2 = " __stringify(_IA64_REG_AR_ITC) "\n"
706 ";;\n"
707 "cmp.eq p6, p0 = r2, r8\n"
708 ";;\n"
709 "(p6) br.cond.spnt xen_get_itc\n"
710 ";;\n"
711
712 /* get itm */
713 "mov r2 = " __stringify(_IA64_REG_CR_ITM) "\n"
714 ";;\n"
715 "cmp.eq p6, p0 = r2, r8\n"
716 ";;\n"
717 "(p6) br.cond.spnt xen_get_itm_with_offset\n"
718 ";;\n"
719
720 __DEFINE_GET_REG(CR_IVR, IVR)
721 __DEFINE_GET_REG(CR_TPR, TPR)
722
723 /* fall back */
724 "movl r2 = ia64_native_getreg_func\n"
725 ";;\n"
726 "mov b7 = r2\n"
727 ";;\n"
728 "br.cond.sptk.many b7\n");
729
730 extern void xen_setreg(int regnum, unsigned long val);
731 #define __DEFINE_SET_REG(id, privop) \
732 "mov r2 = " __stringify(_IA64_REG_ ## id) "\n" \
733 ";;\n" \
734 "cmp.eq p6, p0 = r2, r9\n" \
735 ";;\n" \
736 "(p6) break " __stringify(HYPERPRIVOP_ ## privop) "\n" \
737 "(p6) br.cond.sptk.many b6\n" \
738 ";;\n"
739
740 __DEFINE_FUNC(setreg,
741 /* kr0 .. kr 7*/
742 /*
743 * if (_IA64_REG_AR_KR0 <= regnum &&
744 * regnum <= _IA64_REG_AR_KR7) {
745 * register __index asm ("r8") = regnum - _IA64_REG_AR_KR0
746 * register __val asm ("r9") = val
747 * "break HYPERPRIVOP_SET_KR"
748 * }
749 */
750 "mov r17 = r9\n"
751 "mov r2 = " __stringify(_IA64_REG_AR_KR0) "\n"
752 ";;\n"
753 "cmp.ge p6, p0 = r9, r2\n"
754 "sub r17 = r17, r2\n"
755 ";;\n"
756 "(p6) cmp.ge.unc p7, p0 = "
757 __stringify(_IA64_REG_AR_KR7) " - " __stringify(_IA64_REG_AR_KR0)
758 ", r17\n"
759 ";;\n"
760 "(p7) mov r9 = r8\n"
761 ";;\n"
762 "(p7) mov r8 = r17\n"
763 "(p7) break " __stringify(HYPERPRIVOP_SET_KR) "\n"
764
765 /* set itm */
766 "mov r2 = " __stringify(_IA64_REG_CR_ITM) "\n"
767 ";;\n"
768 "cmp.eq p6, p0 = r2, r8\n"
769 ";;\n"
770 "(p6) br.cond.spnt xen_set_itm_with_offset\n"
771
772 /* set itc */
773 "mov r2 = " __stringify(_IA64_REG_AR_ITC) "\n"
774 ";;\n"
775 "cmp.eq p6, p0 = r2, r8\n"
776 ";;\n"
777 "(p6) br.cond.spnt xen_set_itc\n"
778
779 __DEFINE_SET_REG(CR_TPR, SET_TPR)
780 __DEFINE_SET_REG(CR_EOI, EOI)
781
782 /* fall back */
783 "movl r2 = ia64_native_setreg_func\n"
784 ";;\n"
785 "mov b7 = r2\n"
786 ";;\n"
787 "br.cond.sptk.many b7\n");
788 #endif
789
790 static const struct pv_cpu_ops xen_cpu_ops __initconst = {
791 .fc = xen_fc,
792 .thash = xen_thash,
793 .get_cpuid = xen_get_cpuid,
794 .get_pmd = xen_get_pmd,
795 .getreg = xen_getreg,
796 .setreg = xen_setreg,
797 .ptcga = xen_ptcga,
798 .get_rr = xen_get_rr,
799 .set_rr = xen_set_rr,
800 .set_rr0_to_rr4 = xen_set_rr0_to_rr4,
801 .ssm_i = xen_ssm_i,
802 .rsm_i = xen_rsm_i,
803 .get_psr_i = xen_get_psr_i,
804 .intrin_local_irq_restore
805 = xen_intrin_local_irq_restore,
806 };
807
808 /******************************************************************************
809 * replacement of hand written assembly codes.
810 */
811
812 extern char xen_switch_to;
813 extern char xen_leave_syscall;
814 extern char xen_work_processed_syscall;
815 extern char xen_leave_kernel;
816
817 const struct pv_cpu_asm_switch xen_cpu_asm_switch = {
818 .switch_to = (unsigned long)&xen_switch_to,
819 .leave_syscall = (unsigned long)&xen_leave_syscall,
820 .work_processed_syscall = (unsigned long)&xen_work_processed_syscall,
821 .leave_kernel = (unsigned long)&xen_leave_kernel,
822 };
823
824 /***************************************************************************
825 * pv_iosapic_ops
826 * iosapic read/write hooks.
827 */
828 static void
xen_pcat_compat_init(void)829 xen_pcat_compat_init(void)
830 {
831 /* nothing */
832 }
833
834 static struct irq_chip*
xen_iosapic_get_irq_chip(unsigned long trigger)835 xen_iosapic_get_irq_chip(unsigned long trigger)
836 {
837 return NULL;
838 }
839
840 static unsigned int
xen_iosapic_read(char __iomem * iosapic,unsigned int reg)841 xen_iosapic_read(char __iomem *iosapic, unsigned int reg)
842 {
843 struct physdev_apic apic_op;
844 int ret;
845
846 apic_op.apic_physbase = (unsigned long)iosapic -
847 __IA64_UNCACHED_OFFSET;
848 apic_op.reg = reg;
849 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
850 if (ret)
851 return ret;
852 return apic_op.value;
853 }
854
855 static void
xen_iosapic_write(char __iomem * iosapic,unsigned int reg,u32 val)856 xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
857 {
858 struct physdev_apic apic_op;
859
860 apic_op.apic_physbase = (unsigned long)iosapic -
861 __IA64_UNCACHED_OFFSET;
862 apic_op.reg = reg;
863 apic_op.value = val;
864 HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
865 }
866
867 static struct pv_iosapic_ops xen_iosapic_ops __initdata = {
868 .pcat_compat_init = xen_pcat_compat_init,
869 .__get_irq_chip = xen_iosapic_get_irq_chip,
870
871 .__read = xen_iosapic_read,
872 .__write = xen_iosapic_write,
873 };
874
875 /***************************************************************************
876 * pv_ops initialization
877 */
878
879 void __init
xen_setup_pv_ops(void)880 xen_setup_pv_ops(void)
881 {
882 xen_info_init();
883 pv_info = xen_info;
884 pv_init_ops = xen_init_ops;
885 pv_fsys_data = xen_fsys_data;
886 pv_patchdata = xen_patchdata;
887 pv_cpu_ops = xen_cpu_ops;
888 pv_iosapic_ops = xen_iosapic_ops;
889 pv_irq_ops = xen_irq_ops;
890 pv_time_ops = xen_time_ops;
891
892 paravirt_cpu_asm_init(&xen_cpu_asm_switch);
893 }
894
895 #ifdef ASM_SUPPORTED
896 /***************************************************************************
897 * binary pacthing
898 * pv_init_ops.patch_bundle
899 */
900
901 #define DEFINE_FUNC_GETREG(name, privop) \
902 DEFINE_FUNC0(get_ ## name, \
903 "break "__stringify(HYPERPRIVOP_GET_ ## privop) "\n")
904
905 DEFINE_FUNC_GETREG(psr, PSR);
906 DEFINE_FUNC_GETREG(eflag, EFLAG);
907 DEFINE_FUNC_GETREG(ivr, IVR);
908 DEFINE_FUNC_GETREG(tpr, TPR);
909
910 #define DEFINE_FUNC_SET_KR(n) \
911 DEFINE_VOID_FUNC0(set_kr ## n, \
912 ";;\n" \
913 "mov r9 = r8\n" \
914 "mov r8 = " #n "\n" \
915 "break " __stringify(HYPERPRIVOP_SET_KR) "\n")
916
917 DEFINE_FUNC_SET_KR(0);
918 DEFINE_FUNC_SET_KR(1);
919 DEFINE_FUNC_SET_KR(2);
920 DEFINE_FUNC_SET_KR(3);
921 DEFINE_FUNC_SET_KR(4);
922 DEFINE_FUNC_SET_KR(5);
923 DEFINE_FUNC_SET_KR(6);
924 DEFINE_FUNC_SET_KR(7);
925
926 #define __DEFINE_FUNC_SETREG(name, privop) \
927 DEFINE_VOID_FUNC0(name, \
928 "break "__stringify(HYPERPRIVOP_ ## privop) "\n")
929
930 #define DEFINE_FUNC_SETREG(name, privop) \
931 __DEFINE_FUNC_SETREG(set_ ## name, SET_ ## privop)
932
933 DEFINE_FUNC_SETREG(eflag, EFLAG);
934 DEFINE_FUNC_SETREG(tpr, TPR);
935 __DEFINE_FUNC_SETREG(eoi, EOI);
936
937 extern const char xen_check_events[];
938 extern const char __xen_intrin_local_irq_restore_direct_start[];
939 extern const char __xen_intrin_local_irq_restore_direct_end[];
940 extern const unsigned long __xen_intrin_local_irq_restore_direct_reloc;
941
942 asm (
943 ".align 32\n"
944 ".proc xen_check_events\n"
945 "xen_check_events:\n"
946 /* masked = 0
947 * r9 = masked_addr - 1
948 * = pending_intr_addr
949 */
950 "st1.rel [r9] = r0, -1\n"
951 ";;\n"
952 /* r8 = pending_intr */
953 "ld1.acq r11 = [r9]\n"
954 ";;\n"
955 /* p9 = interrupt pending? */
956 "cmp.ne p9, p10 = r11, r0\n"
957 ";;\n"
958 "(p10) mf\n"
959 /* issue hypercall to trigger interrupt */
960 "(p9) break " __stringify(HYPERPRIVOP_SSM_I) "\n"
961 "br.cond.sptk.many b6\n"
962 ".endp xen_check_events\n"
963 "\n"
964 ".align 32\n"
965 ".proc __xen_intrin_local_irq_restore_direct\n"
966 "__xen_intrin_local_irq_restore_direct:\n"
967 "__xen_intrin_local_irq_restore_direct_start:\n"
968 "1:\n"
969 "{\n"
970 "cmp.ne p6, p7 = r8, r0\n"
971 "mov r17 = ip\n" /* get ip to calc return address */
972 "mov r9 = "__stringify(XEN_PSR_I_ADDR_ADDR) "\n"
973 ";;\n"
974 "}\n"
975 "{\n"
976 /* r9 = XEN_PSR_I_ADDR */
977 "ld8 r9 = [r9]\n"
978 ";;\n"
979 /* r10 = masked previous value */
980 "(p6) ld1.acq r10 = [r9]\n"
981 "adds r17 = 1f - 1b, r17\n" /* calculate return address */
982 ";;\n"
983 "}\n"
984 "{\n"
985 /* p8 = !masked interrupt masked previously? */
986 "(p6) cmp.ne.unc p8, p0 = r10, r0\n"
987 "\n"
988 /* p7 = else clause */
989 "(p7) mov r11 = 1\n"
990 ";;\n"
991 "(p8) mov b6 = r17\n" /* set return address */
992 "}\n"
993 "{\n"
994 /* masked = 1 */
995 "(p7) st1.rel [r9] = r11\n"
996 "\n"
997 "[99:]\n"
998 "(p8) brl.cond.dptk.few xen_check_events\n"
999 "}\n"
1000 /* pv calling stub is 5 bundles. fill nop to adjust return address */
1001 "{\n"
1002 "nop 0\n"
1003 "nop 0\n"
1004 "nop 0\n"
1005 "}\n"
1006 "1:\n"
1007 "__xen_intrin_local_irq_restore_direct_end:\n"
1008 ".endp __xen_intrin_local_irq_restore_direct\n"
1009 "\n"
1010 ".align 8\n"
1011 "__xen_intrin_local_irq_restore_direct_reloc:\n"
1012 "data8 99b\n"
1013 );
1014
1015 static struct paravirt_patch_bundle_elem xen_patch_bundle_elems[]
1016 __initdata_or_module =
1017 {
1018 #define XEN_PATCH_BUNDLE_ELEM(name, type) \
1019 { \
1020 (void*)xen_ ## name ## _direct_start, \
1021 (void*)xen_ ## name ## _direct_end, \
1022 PARAVIRT_PATCH_TYPE_ ## type, \
1023 }
1024
1025 XEN_PATCH_BUNDLE_ELEM(fc, FC),
1026 XEN_PATCH_BUNDLE_ELEM(thash, THASH),
1027 XEN_PATCH_BUNDLE_ELEM(get_cpuid, GET_CPUID),
1028 XEN_PATCH_BUNDLE_ELEM(get_pmd, GET_PMD),
1029 XEN_PATCH_BUNDLE_ELEM(ptcga, PTCGA),
1030 XEN_PATCH_BUNDLE_ELEM(get_rr, GET_RR),
1031 XEN_PATCH_BUNDLE_ELEM(set_rr, SET_RR),
1032 XEN_PATCH_BUNDLE_ELEM(set_rr0_to_rr4, SET_RR0_TO_RR4),
1033 XEN_PATCH_BUNDLE_ELEM(ssm_i, SSM_I),
1034 XEN_PATCH_BUNDLE_ELEM(rsm_i, RSM_I),
1035 XEN_PATCH_BUNDLE_ELEM(get_psr_i, GET_PSR_I),
1036 {
1037 (void*)__xen_intrin_local_irq_restore_direct_start,
1038 (void*)__xen_intrin_local_irq_restore_direct_end,
1039 PARAVIRT_PATCH_TYPE_INTRIN_LOCAL_IRQ_RESTORE,
1040 },
1041
1042 #define XEN_PATCH_BUNDLE_ELEM_GETREG(name, reg) \
1043 { \
1044 xen_get_ ## name ## _direct_start, \
1045 xen_get_ ## name ## _direct_end, \
1046 PARAVIRT_PATCH_TYPE_GETREG + _IA64_REG_ ## reg, \
1047 }
1048
1049 XEN_PATCH_BUNDLE_ELEM_GETREG(psr, PSR),
1050 XEN_PATCH_BUNDLE_ELEM_GETREG(eflag, AR_EFLAG),
1051
1052 XEN_PATCH_BUNDLE_ELEM_GETREG(ivr, CR_IVR),
1053 XEN_PATCH_BUNDLE_ELEM_GETREG(tpr, CR_TPR),
1054
1055 XEN_PATCH_BUNDLE_ELEM_GETREG(itc, AR_ITC),
1056 XEN_PATCH_BUNDLE_ELEM_GETREG(itm_with_offset, CR_ITM),
1057
1058
1059 #define __XEN_PATCH_BUNDLE_ELEM_SETREG(name, reg) \
1060 { \
1061 xen_ ## name ## _direct_start, \
1062 xen_ ## name ## _direct_end, \
1063 PARAVIRT_PATCH_TYPE_SETREG + _IA64_REG_ ## reg, \
1064 }
1065
1066 #define XEN_PATCH_BUNDLE_ELEM_SETREG(name, reg) \
1067 __XEN_PATCH_BUNDLE_ELEM_SETREG(set_ ## name, reg)
1068
1069 XEN_PATCH_BUNDLE_ELEM_SETREG(kr0, AR_KR0),
1070 XEN_PATCH_BUNDLE_ELEM_SETREG(kr1, AR_KR1),
1071 XEN_PATCH_BUNDLE_ELEM_SETREG(kr2, AR_KR2),
1072 XEN_PATCH_BUNDLE_ELEM_SETREG(kr3, AR_KR3),
1073 XEN_PATCH_BUNDLE_ELEM_SETREG(kr4, AR_KR4),
1074 XEN_PATCH_BUNDLE_ELEM_SETREG(kr5, AR_KR5),
1075 XEN_PATCH_BUNDLE_ELEM_SETREG(kr6, AR_KR6),
1076 XEN_PATCH_BUNDLE_ELEM_SETREG(kr7, AR_KR7),
1077
1078 XEN_PATCH_BUNDLE_ELEM_SETREG(eflag, AR_EFLAG),
1079 XEN_PATCH_BUNDLE_ELEM_SETREG(tpr, CR_TPR),
1080 __XEN_PATCH_BUNDLE_ELEM_SETREG(eoi, CR_EOI),
1081
1082 XEN_PATCH_BUNDLE_ELEM_SETREG(itc, AR_ITC),
1083 XEN_PATCH_BUNDLE_ELEM_SETREG(itm_with_offset, CR_ITM),
1084 };
1085
1086 static unsigned long __init_or_module
xen_patch_bundle(void * sbundle,void * ebundle,unsigned long type)1087 xen_patch_bundle(void *sbundle, void *ebundle, unsigned long type)
1088 {
1089 const unsigned long nelems = sizeof(xen_patch_bundle_elems) /
1090 sizeof(xen_patch_bundle_elems[0]);
1091 unsigned long used;
1092 const struct paravirt_patch_bundle_elem *found;
1093
1094 used = __paravirt_patch_apply_bundle(sbundle, ebundle, type,
1095 xen_patch_bundle_elems, nelems,
1096 &found);
1097
1098 if (found == NULL)
1099 /* fallback */
1100 return ia64_native_patch_bundle(sbundle, ebundle, type);
1101 if (used == 0)
1102 return used;
1103
1104 /* relocation */
1105 switch (type) {
1106 case PARAVIRT_PATCH_TYPE_INTRIN_LOCAL_IRQ_RESTORE: {
1107 unsigned long reloc =
1108 __xen_intrin_local_irq_restore_direct_reloc;
1109 unsigned long reloc_offset = reloc - (unsigned long)
1110 __xen_intrin_local_irq_restore_direct_start;
1111 unsigned long tag = (unsigned long)sbundle + reloc_offset;
1112 paravirt_patch_reloc_brl(tag, xen_check_events);
1113 break;
1114 }
1115 default:
1116 /* nothing */
1117 break;
1118 }
1119 return used;
1120 }
1121 #endif /* ASM_SUPPOTED */
1122
1123 const struct paravirt_patch_branch_target xen_branch_target[]
1124 __initconst = {
1125 #define PARAVIRT_BR_TARGET(name, type) \
1126 { \
1127 &xen_ ## name, \
1128 PARAVIRT_PATCH_TYPE_BR_ ## type, \
1129 }
1130 PARAVIRT_BR_TARGET(switch_to, SWITCH_TO),
1131 PARAVIRT_BR_TARGET(leave_syscall, LEAVE_SYSCALL),
1132 PARAVIRT_BR_TARGET(work_processed_syscall, WORK_PROCESSED_SYSCALL),
1133 PARAVIRT_BR_TARGET(leave_kernel, LEAVE_KERNEL),
1134 };
1135
1136 static void __init
xen_patch_branch(unsigned long tag,unsigned long type)1137 xen_patch_branch(unsigned long tag, unsigned long type)
1138 {
1139 __paravirt_patch_apply_branch(tag, type, xen_branch_target,
1140 ARRAY_SIZE(xen_branch_target));
1141 }
1142