/arch/mips/kernel/vpe.c
C | 1623 lines | 1084 code | 329 blank | 210 comment | 176 complexity | 94d0fad7b0e959290a19c94ca73cfef9 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
1/*
2 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
3 *
4 * This program is free software; you can distribute it and/or modify it
5 * under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
16 */
17
18/*
19 * VPE support module
20 *
21 * Provides support for loading a MIPS SP program on VPE1.
22 * The SP enviroment is rather simple, no tlb's. It needs to be relocatable
23 * (or partially linked). You should initialise your stack in the startup
24 * code. This loader looks for the symbol __start and sets up
25 * execution to resume from there. The MIPS SDE kit contains suitable examples.
26 *
27 * To load and run, simply cat a SP 'program file' to /dev/vpe1.
28 * i.e cat spapp >/dev/vpe1.
29 */
30#include <linux/kernel.h>
31#include <linux/device.h>
32#include <linux/module.h>
33#include <linux/fs.h>
34#include <linux/init.h>
35#include <asm/uaccess.h>
36#include <linux/slab.h>
37#include <linux/list.h>
38#include <linux/vmalloc.h>
39#include <linux/elf.h>
40#include <linux/seq_file.h>
41#include <linux/syscalls.h>
42#include <linux/moduleloader.h>
43#include <linux/interrupt.h>
44#include <linux/poll.h>
45#include <linux/bootmem.h>
46#include <asm/mipsregs.h>
47#include <asm/mipsmtregs.h>
48#include <asm/cacheflush.h>
49#include <asm/atomic.h>
50#include <asm/cpu.h>
51#include <asm/mips_mt.h>
52#include <asm/processor.h>
53#include <asm/system.h>
54#include <asm/vpe.h>
55#include <asm/kspd.h>
56
57typedef void *vpe_handle;
58
59#ifndef ARCH_SHF_SMALL
60#define ARCH_SHF_SMALL 0
61#endif
62
63/* If this is set, the section belongs in the init part of the module */
64#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
65
66/*
67 * The number of TCs and VPEs physically available on the core
68 */
69static int hw_tcs, hw_vpes;
70static char module_name[] = "vpe";
71static int major;
72static const int minor = 1; /* fixed for now */
73
74#ifdef CONFIG_MIPS_APSP_KSPD
75static struct kspd_notifications kspd_events;
76static int kspd_events_reqd;
77#endif
78
79/* grab the likely amount of memory we will need. */
80#ifdef CONFIG_MIPS_VPE_LOADER_TOM
81#define P_SIZE (2 * 1024 * 1024)
82#else
83/* add an overhead to the max kmalloc size for non-striped symbols/etc */
84#define P_SIZE (256 * 1024)
85#endif
86
87extern unsigned long physical_memsize;
88
89#define MAX_VPES 16
90#define VPE_PATH_MAX 256
91
92enum vpe_state {
93 VPE_STATE_UNUSED = 0,
94 VPE_STATE_INUSE,
95 VPE_STATE_RUNNING
96};
97
98enum tc_state {
99 TC_STATE_UNUSED = 0,
100 TC_STATE_INUSE,
101 TC_STATE_RUNNING,
102 TC_STATE_DYNAMIC
103};
104
105struct vpe {
106 enum vpe_state state;
107
108 /* (device) minor associated with this vpe */
109 int minor;
110
111 /* elfloader stuff */
112 void *load_addr;
113 unsigned long len;
114 char *pbuffer;
115 unsigned long plen;
116 unsigned int uid, gid;
117 char cwd[VPE_PATH_MAX];
118
119 unsigned long __start;
120
121 /* tc's associated with this vpe */
122 struct list_head tc;
123
124 /* The list of vpe's */
125 struct list_head list;
126
127 /* shared symbol address */
128 void *shared_ptr;
129
130 /* the list of who wants to know when something major happens */
131 struct list_head notify;
132
133 unsigned int ntcs;
134};
135
136struct tc {
137 enum tc_state state;
138 int index;
139
140 struct vpe *pvpe; /* parent VPE */
141 struct list_head tc; /* The list of TC's with this VPE */
142 struct list_head list; /* The global list of tc's */
143};
144
145struct {
146 spinlock_t vpe_list_lock;
147 struct list_head vpe_list; /* Virtual processing elements */
148 spinlock_t tc_list_lock;
149 struct list_head tc_list; /* Thread contexts */
150} vpecontrol = {
151 .vpe_list_lock = SPIN_LOCK_UNLOCKED,
152 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
153 .tc_list_lock = SPIN_LOCK_UNLOCKED,
154 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
155};
156
157static void release_progmem(void *ptr);
158
159/* get the vpe associated with this minor */
160static struct vpe *get_vpe(int minor)
161{
162 struct vpe *res, *v;
163
164 if (!cpu_has_mipsmt)
165 return NULL;
166
167 res = NULL;
168 spin_lock(&vpecontrol.vpe_list_lock);
169 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
170 if (v->minor == minor) {
171 res = v;
172 break;
173 }
174 }
175 spin_unlock(&vpecontrol.vpe_list_lock);
176
177 return res;
178}
179
180/* get the vpe associated with this minor */
181static struct tc *get_tc(int index)
182{
183 struct tc *res, *t;
184
185 res = NULL;
186 spin_lock(&vpecontrol.tc_list_lock);
187 list_for_each_entry(t, &vpecontrol.tc_list, list) {
188 if (t->index == index) {
189 res = t;
190 break;
191 }
192 }
193 spin_unlock(&vpecontrol.tc_list_lock);
194
195 return NULL;
196}
197
198/* allocate a vpe and associate it with this minor (or index) */
199static struct vpe *alloc_vpe(int minor)
200{
201 struct vpe *v;
202
203 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL)
204 return NULL;
205
206 INIT_LIST_HEAD(&v->tc);
207 spin_lock(&vpecontrol.vpe_list_lock);
208 list_add_tail(&v->list, &vpecontrol.vpe_list);
209 spin_unlock(&vpecontrol.vpe_list_lock);
210
211 INIT_LIST_HEAD(&v->notify);
212 v->minor = minor;
213
214 return v;
215}
216
217/* allocate a tc. At startup only tc0 is running, all other can be halted. */
218static struct tc *alloc_tc(int index)
219{
220 struct tc *tc;
221
222 if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
223 goto out;
224
225 INIT_LIST_HEAD(&tc->tc);
226 tc->index = index;
227
228 spin_lock(&vpecontrol.tc_list_lock);
229 list_add_tail(&tc->list, &vpecontrol.tc_list);
230 spin_unlock(&vpecontrol.tc_list_lock);
231
232out:
233 return tc;
234}
235
236/* clean up and free everything */
237static void release_vpe(struct vpe *v)
238{
239 list_del(&v->list);
240 if (v->load_addr)
241 release_progmem(v);
242 kfree(v);
243}
244
245static void __maybe_unused dump_mtregs(void)
246{
247 unsigned long val;
248
249 val = read_c0_config3();
250 printk("config3 0x%lx MT %ld\n", val,
251 (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
252
253 val = read_c0_mvpcontrol();
254 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
255 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
256 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
257 (val & MVPCONTROL_EVP));
258
259 val = read_c0_mvpconf0();
260 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
261 (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
262 val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
263}
264
265/* Find some VPE program space */
266static void *alloc_progmem(unsigned long len)
267{
268 void *addr;
269
270#ifdef CONFIG_MIPS_VPE_LOADER_TOM
271 /*
272 * This means you must tell Linux to use less memory than you
273 * physically have, for example by passing a mem= boot argument.
274 */
275 addr = pfn_to_kaddr(max_low_pfn);
276 memset(addr, 0, len);
277#else
278 /* simple grab some mem for now */
279 addr = kzalloc(len, GFP_KERNEL);
280#endif
281
282 return addr;
283}
284
285static void release_progmem(void *ptr)
286{
287#ifndef CONFIG_MIPS_VPE_LOADER_TOM
288 kfree(ptr);
289#endif
290}
291
292/* Update size with this section: return offset. */
293static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
294{
295 long ret;
296
297 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
298 *size = ret + sechdr->sh_size;
299 return ret;
300}
301
302/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
303 might -- code, read-only data, read-write data, small data. Tally
304 sizes, and place the offsets into sh_entsize fields: high bit means it
305 belongs in init. */
306static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
307 Elf_Shdr * sechdrs, const char *secstrings)
308{
309 static unsigned long const masks[][2] = {
310 /* NOTE: all executable code must be the first section
311 * in this array; otherwise modify the text_size
312 * finder in the two loops below */
313 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
314 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
315 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
316 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
317 };
318 unsigned int m, i;
319
320 for (i = 0; i < hdr->e_shnum; i++)
321 sechdrs[i].sh_entsize = ~0UL;
322
323 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
324 for (i = 0; i < hdr->e_shnum; ++i) {
325 Elf_Shdr *s = &sechdrs[i];
326
327 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
328 if ((s->sh_flags & masks[m][0]) != masks[m][0]
329 || (s->sh_flags & masks[m][1])
330 || s->sh_entsize != ~0UL)
331 continue;
332 s->sh_entsize =
333 get_offset((unsigned long *)&mod->core_size, s);
334 }
335
336 if (m == 0)
337 mod->core_text_size = mod->core_size;
338
339 }
340}
341
342
343/* from module-elf32.c, but subverted a little */
344
345struct mips_hi16 {
346 struct mips_hi16 *next;
347 Elf32_Addr *addr;
348 Elf32_Addr value;
349};
350
351static struct mips_hi16 *mips_hi16_list;
352static unsigned int gp_offs, gp_addr;
353
354static int apply_r_mips_none(struct module *me, uint32_t *location,
355 Elf32_Addr v)
356{
357 return 0;
358}
359
360static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
361 Elf32_Addr v)
362{
363 int rel;
364
365 if( !(*location & 0xffff) ) {
366 rel = (int)v - gp_addr;
367 }
368 else {
369 /* .sbss + gp(relative) + offset */
370 /* kludge! */
371 rel = (int)(short)((int)v + gp_offs +
372 (int)(short)(*location & 0xffff) - gp_addr);
373 }
374
375 if( (rel > 32768) || (rel < -32768) ) {
376 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
377 "relative address 0x%x out of range of gp register\n",
378 rel);
379 return -ENOEXEC;
380 }
381
382 *location = (*location & 0xffff0000) | (rel & 0xffff);
383
384 return 0;
385}
386
387static int apply_r_mips_pc16(struct module *me, uint32_t *location,
388 Elf32_Addr v)
389{
390 int rel;
391 rel = (((unsigned int)v - (unsigned int)location));
392 rel >>= 2; // because the offset is in _instructions_ not bytes.
393 rel -= 1; // and one instruction less due to the branch delay slot.
394
395 if( (rel > 32768) || (rel < -32768) ) {
396 printk(KERN_DEBUG "VPE loader: "
397 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
398 return -ENOEXEC;
399 }
400
401 *location = (*location & 0xffff0000) | (rel & 0xffff);
402
403 return 0;
404}
405
406static int apply_r_mips_32(struct module *me, uint32_t *location,
407 Elf32_Addr v)
408{
409 *location += v;
410
411 return 0;
412}
413
414static int apply_r_mips_26(struct module *me, uint32_t *location,
415 Elf32_Addr v)
416{
417 if (v % 4) {
418 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
419 " unaligned relocation\n");
420 return -ENOEXEC;
421 }
422
423/*
424 * Not desperately convinced this is a good check of an overflow condition
425 * anyway. But it gets in the way of handling undefined weak symbols which
426 * we want to set to zero.
427 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
428 * printk(KERN_ERR
429 * "module %s: relocation overflow\n",
430 * me->name);
431 * return -ENOEXEC;
432 * }
433 */
434
435 *location = (*location & ~0x03ffffff) |
436 ((*location + (v >> 2)) & 0x03ffffff);
437 return 0;
438}
439
440static int apply_r_mips_hi16(struct module *me, uint32_t *location,
441 Elf32_Addr v)
442{
443 struct mips_hi16 *n;
444
445 /*
446 * We cannot relocate this one now because we don't know the value of
447 * the carry we need to add. Save the information, and let LO16 do the
448 * actual relocation.
449 */
450 n = kmalloc(sizeof *n, GFP_KERNEL);
451 if (!n)
452 return -ENOMEM;
453
454 n->addr = location;
455 n->value = v;
456 n->next = mips_hi16_list;
457 mips_hi16_list = n;
458
459 return 0;
460}
461
462static int apply_r_mips_lo16(struct module *me, uint32_t *location,
463 Elf32_Addr v)
464{
465 unsigned long insnlo = *location;
466 Elf32_Addr val, vallo;
467 struct mips_hi16 *l, *next;
468
469 /* Sign extend the addend we extract from the lo insn. */
470 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
471
472 if (mips_hi16_list != NULL) {
473
474 l = mips_hi16_list;
475 while (l != NULL) {
476 unsigned long insn;
477
478 /*
479 * The value for the HI16 had best be the same.
480 */
481 if (v != l->value) {
482 printk(KERN_DEBUG "VPE loader: "
483 "apply_r_mips_lo16/hi16: \t"
484 "inconsistent value information\n");
485 goto out_free;
486 }
487
488 /*
489 * Do the HI16 relocation. Note that we actually don't
490 * need to know anything about the LO16 itself, except
491 * where to find the low 16 bits of the addend needed
492 * by the LO16.
493 */
494 insn = *l->addr;
495 val = ((insn & 0xffff) << 16) + vallo;
496 val += v;
497
498 /*
499 * Account for the sign extension that will happen in
500 * the low bits.
501 */
502 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
503
504 insn = (insn & ~0xffff) | val;
505 *l->addr = insn;
506
507 next = l->next;
508 kfree(l);
509 l = next;
510 }
511
512 mips_hi16_list = NULL;
513 }
514
515 /*
516 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
517 */
518 val = v + vallo;
519 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
520 *location = insnlo;
521
522 return 0;
523
524out_free:
525 while (l != NULL) {
526 next = l->next;
527 kfree(l);
528 l = next;
529 }
530 mips_hi16_list = NULL;
531
532 return -ENOEXEC;
533}
534
535static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
536 Elf32_Addr v) = {
537 [R_MIPS_NONE] = apply_r_mips_none,
538 [R_MIPS_32] = apply_r_mips_32,
539 [R_MIPS_26] = apply_r_mips_26,
540 [R_MIPS_HI16] = apply_r_mips_hi16,
541 [R_MIPS_LO16] = apply_r_mips_lo16,
542 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
543 [R_MIPS_PC16] = apply_r_mips_pc16
544};
545
546static char *rstrs[] = {
547 [R_MIPS_NONE] = "MIPS_NONE",
548 [R_MIPS_32] = "MIPS_32",
549 [R_MIPS_26] = "MIPS_26",
550 [R_MIPS_HI16] = "MIPS_HI16",
551 [R_MIPS_LO16] = "MIPS_LO16",
552 [R_MIPS_GPREL16] = "MIPS_GPREL16",
553 [R_MIPS_PC16] = "MIPS_PC16"
554};
555
556static int apply_relocations(Elf32_Shdr *sechdrs,
557 const char *strtab,
558 unsigned int symindex,
559 unsigned int relsec,
560 struct module *me)
561{
562 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
563 Elf32_Sym *sym;
564 uint32_t *location;
565 unsigned int i;
566 Elf32_Addr v;
567 int res;
568
569 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
570 Elf32_Word r_info = rel[i].r_info;
571
572 /* This is where to make the change */
573 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
574 + rel[i].r_offset;
575 /* This is the symbol it is referring to */
576 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
577 + ELF32_R_SYM(r_info);
578
579 if (!sym->st_value) {
580 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
581 me->name, strtab + sym->st_name);
582 /* just print the warning, dont barf */
583 }
584
585 v = sym->st_value;
586
587 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
588 if( res ) {
589 char *r = rstrs[ELF32_R_TYPE(r_info)];
590 printk(KERN_WARNING "VPE loader: .text+0x%x "
591 "relocation type %s for symbol \"%s\" failed\n",
592 rel[i].r_offset, r ? r : "UNKNOWN",
593 strtab + sym->st_name);
594 return res;
595 }
596 }
597
598 return 0;
599}
600
601static inline void save_gp_address(unsigned int secbase, unsigned int rel)
602{
603 gp_addr = secbase + rel;
604 gp_offs = gp_addr - (secbase & 0xffff0000);
605}
606/* end module-elf32.c */
607
608
609
610/* Change all symbols so that sh_value encodes the pointer directly. */
611static void simplify_symbols(Elf_Shdr * sechdrs,
612 unsigned int symindex,
613 const char *strtab,
614 const char *secstrings,
615 unsigned int nsecs, struct module *mod)
616{
617 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
618 unsigned long secbase, bssbase = 0;
619 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
620 int size;
621
622 /* find the .bss section for COMMON symbols */
623 for (i = 0; i < nsecs; i++) {
624 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
625 bssbase = sechdrs[i].sh_addr;
626 break;
627 }
628 }
629
630 for (i = 1; i < n; i++) {
631 switch (sym[i].st_shndx) {
632 case SHN_COMMON:
633 /* Allocate space for the symbol in the .bss section.
634 st_value is currently size.
635 We want it to have the address of the symbol. */
636
637 size = sym[i].st_value;
638 sym[i].st_value = bssbase;
639
640 bssbase += size;
641 break;
642
643 case SHN_ABS:
644 /* Don't need to do anything */
645 break;
646
647 case SHN_UNDEF:
648 /* ret = -ENOENT; */
649 break;
650
651 case SHN_MIPS_SCOMMON:
652 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON "
653 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
654 sym[i].st_shndx);
655 // .sbss section
656 break;
657
658 default:
659 secbase = sechdrs[sym[i].st_shndx].sh_addr;
660
661 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
662 save_gp_address(secbase, sym[i].st_value);
663 }
664
665 sym[i].st_value += secbase;
666 break;
667 }
668 }
669}
670
671#ifdef DEBUG_ELFLOADER
672static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
673 const char *strtab, struct module *mod)
674{
675 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
676 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
677
678 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
679 for (i = 1; i < n; i++) {
680 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
681 strtab + sym[i].st_name, sym[i].st_value);
682 }
683}
684#endif
685
686/* We are prepared so configure and start the VPE... */
687static int vpe_run(struct vpe * v)
688{
689 unsigned long flags, val, dmt_flag;
690 struct vpe_notifications *n;
691 unsigned int vpeflags;
692 struct tc *t;
693
694 /* check we are the Master VPE */
695 local_irq_save(flags);
696 val = read_c0_vpeconf0();
697 if (!(val & VPECONF0_MVP)) {
698 printk(KERN_WARNING
699 "VPE loader: only Master VPE's are allowed to configure MT\n");
700 local_irq_restore(flags);
701
702 return -1;
703 }
704
705 dmt_flag = dmt();
706 vpeflags = dvpe();
707
708 if (!list_empty(&v->tc)) {
709 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
710 evpe(vpeflags);
711 emt(dmt_flag);
712 local_irq_restore(flags);
713
714 printk(KERN_WARNING
715 "VPE loader: TC %d is already in use.\n",
716 t->index);
717 return -ENOEXEC;
718 }
719 } else {
720 evpe(vpeflags);
721 emt(dmt_flag);
722 local_irq_restore(flags);
723
724 printk(KERN_WARNING
725 "VPE loader: No TC's associated with VPE %d\n",
726 v->minor);
727
728 return -ENOEXEC;
729 }
730
731 /* Put MVPE's into 'configuration state' */
732 set_c0_mvpcontrol(MVPCONTROL_VPC);
733
734 settc(t->index);
735
736 /* should check it is halted, and not activated */
737 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
738 evpe(vpeflags);
739 emt(dmt_flag);
740 local_irq_restore(flags);
741
742 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
743 t->index);
744
745 return -ENOEXEC;
746 }
747
748 /* Write the address we want it to start running from in the TCPC register. */
749 write_tc_c0_tcrestart((unsigned long)v->__start);
750 write_tc_c0_tccontext((unsigned long)0);
751
752 /*
753 * Mark the TC as activated, not interrupt exempt and not dynamically
754 * allocatable
755 */
756 val = read_tc_c0_tcstatus();
757 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
758 write_tc_c0_tcstatus(val);
759
760 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
761
762 /*
763 * The sde-kit passes 'memsize' to __start in $a3, so set something
764 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
765 * DFLT_HEAP_SIZE when you compile your program
766 */
767 mttgpr(6, v->ntcs);
768 mttgpr(7, physical_memsize);
769
770 /* set up VPE1 */
771 /*
772 * bind the TC to VPE 1 as late as possible so we only have the final
773 * VPE registers to set up, and so an EJTAG probe can trigger on it
774 */
775 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
776
777 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
778
779 back_to_back_c0_hazard();
780
781 /* Set up the XTC bit in vpeconf0 to point at our tc */
782 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
783 | (t->index << VPECONF0_XTC_SHIFT));
784
785 back_to_back_c0_hazard();
786
787 /* enable this VPE */
788 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
789
790 /* clear out any left overs from a previous program */
791 write_vpe_c0_status(0);
792 write_vpe_c0_cause(0);
793
794 /* take system out of configuration state */
795 clear_c0_mvpcontrol(MVPCONTROL_VPC);
796
797 /*
798 * SMTC/SMVP kernels manage VPE enable independently,
799 * but uniprocessor kernels need to turn it on, even
800 * if that wasn't the pre-dvpe() state.
801 */
802#ifdef CONFIG_SMP
803 evpe(vpeflags);
804#else
805 evpe(EVPE_ENABLE);
806#endif
807 emt(dmt_flag);
808 local_irq_restore(flags);
809
810 list_for_each_entry(n, &v->notify, list)
811 n->start(minor);
812
813 return 0;
814}
815
816static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
817 unsigned int symindex, const char *strtab,
818 struct module *mod)
819{
820 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
821 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
822
823 for (i = 1; i < n; i++) {
824 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
825 v->__start = sym[i].st_value;
826 }
827
828 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
829 v->shared_ptr = (void *)sym[i].st_value;
830 }
831 }
832
833 if ( (v->__start == 0) || (v->shared_ptr == NULL))
834 return -1;
835
836 return 0;
837}
838
839/*
840 * Allocates a VPE with some program code space(the load address), copies the
841 * contents of the program (p)buffer performing relocatations/etc, free's it
842 * when finished.
843 */
844static int vpe_elfload(struct vpe * v)
845{
846 Elf_Ehdr *hdr;
847 Elf_Shdr *sechdrs;
848 long err = 0;
849 char *secstrings, *strtab = NULL;
850 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
851 struct module mod; // so we can re-use the relocations code
852
853 memset(&mod, 0, sizeof(struct module));
854 strcpy(mod.name, "VPE loader");
855
856 hdr = (Elf_Ehdr *) v->pbuffer;
857 len = v->plen;
858
859 /* Sanity checks against insmoding binaries or wrong arch,
860 weird elf version */
861 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
862 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
863 || !elf_check_arch(hdr)
864 || hdr->e_shentsize != sizeof(*sechdrs)) {
865 printk(KERN_WARNING
866 "VPE loader: program wrong arch or weird elf version\n");
867
868 return -ENOEXEC;
869 }
870
871 if (hdr->e_type == ET_REL)
872 relocate = 1;
873
874 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
875 printk(KERN_ERR "VPE loader: program length %u truncated\n",
876 len);
877
878 return -ENOEXEC;
879 }
880
881 /* Convenience variables */
882 sechdrs = (void *)hdr + hdr->e_shoff;
883 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
884 sechdrs[0].sh_addr = 0;
885
886 /* And these should exist, but gcc whinges if we don't init them */
887 symindex = strindex = 0;
888
889 if (relocate) {
890 for (i = 1; i < hdr->e_shnum; i++) {
891 if (sechdrs[i].sh_type != SHT_NOBITS
892 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
893 printk(KERN_ERR "VPE program length %u truncated\n",
894 len);
895 return -ENOEXEC;
896 }
897
898 /* Mark all sections sh_addr with their address in the
899 temporary image. */
900 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
901
902 /* Internal symbols and strings. */
903 if (sechdrs[i].sh_type == SHT_SYMTAB) {
904 symindex = i;
905 strindex = sechdrs[i].sh_link;
906 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
907 }
908 }
909 layout_sections(&mod, hdr, sechdrs, secstrings);
910 }
911
912 v->load_addr = alloc_progmem(mod.core_size);
913 if (!v->load_addr)
914 return -ENOMEM;
915
916 pr_info("VPE loader: loading to %p\n", v->load_addr);
917
918 if (relocate) {
919 for (i = 0; i < hdr->e_shnum; i++) {
920 void *dest;
921
922 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
923 continue;
924
925 dest = v->load_addr + sechdrs[i].sh_entsize;
926
927 if (sechdrs[i].sh_type != SHT_NOBITS)
928 memcpy(dest, (void *)sechdrs[i].sh_addr,
929 sechdrs[i].sh_size);
930 /* Update sh_addr to point to copy in image. */
931 sechdrs[i].sh_addr = (unsigned long)dest;
932
933 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
934 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
935 }
936
937 /* Fix up syms, so that st_value is a pointer to location. */
938 simplify_symbols(sechdrs, symindex, strtab, secstrings,
939 hdr->e_shnum, &mod);
940
941 /* Now do relocations. */
942 for (i = 1; i < hdr->e_shnum; i++) {
943 const char *strtab = (char *)sechdrs[strindex].sh_addr;
944 unsigned int info = sechdrs[i].sh_info;
945
946 /* Not a valid relocation section? */
947 if (info >= hdr->e_shnum)
948 continue;
949
950 /* Don't bother with non-allocated sections */
951 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
952 continue;
953
954 if (sechdrs[i].sh_type == SHT_REL)
955 err = apply_relocations(sechdrs, strtab, symindex, i,
956 &mod);
957 else if (sechdrs[i].sh_type == SHT_RELA)
958 err = apply_relocate_add(sechdrs, strtab, symindex, i,
959 &mod);
960 if (err < 0)
961 return err;
962
963 }
964 } else {
965 struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
966
967 for (i = 0; i < hdr->e_phnum; i++) {
968 if (phdr->p_type == PT_LOAD) {
969 memcpy((void *)phdr->p_paddr,
970 (char *)hdr + phdr->p_offset,
971 phdr->p_filesz);
972 memset((void *)phdr->p_paddr + phdr->p_filesz,
973 0, phdr->p_memsz - phdr->p_filesz);
974 }
975 phdr++;
976 }
977
978 for (i = 0; i < hdr->e_shnum; i++) {
979 /* Internal symbols and strings. */
980 if (sechdrs[i].sh_type == SHT_SYMTAB) {
981 symindex = i;
982 strindex = sechdrs[i].sh_link;
983 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
984
985 /* mark the symtab's address for when we try to find the
986 magic symbols */
987 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
988 }
989 }
990 }
991
992 /* make sure it's physically written out */
993 flush_icache_range((unsigned long)v->load_addr,
994 (unsigned long)v->load_addr + v->len);
995
996 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
997 if (v->__start == 0) {
998 printk(KERN_WARNING "VPE loader: program does not contain "
999 "a __start symbol\n");
1000 return -ENOEXEC;
1001 }
1002
1003 if (v->shared_ptr == NULL)
1004 printk(KERN_WARNING "VPE loader: "
1005 "program does not contain vpe_shared symbol.\n"
1006 " Unable to use AMVP (AP/SP) facilities.\n");
1007 }
1008
1009 printk(" elf loaded\n");
1010 return 0;
1011}
1012
1013static void cleanup_tc(struct tc *tc)
1014{
1015 unsigned long flags;
1016 unsigned int mtflags, vpflags;
1017 int tmp;
1018
1019 local_irq_save(flags);
1020 mtflags = dmt();
1021 vpflags = dvpe();
1022 /* Put MVPE's into 'configuration state' */
1023 set_c0_mvpcontrol(MVPCONTROL_VPC);
1024
1025 settc(tc->index);
1026 tmp = read_tc_c0_tcstatus();
1027
1028 /* mark not allocated and not dynamically allocatable */
1029 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1030 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1031 write_tc_c0_tcstatus(tmp);
1032
1033 write_tc_c0_tchalt(TCHALT_H);
1034 mips_ihb();
1035
1036 /* bind it to anything other than VPE1 */
1037// write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1038
1039 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1040 evpe(vpflags);
1041 emt(mtflags);
1042 local_irq_restore(flags);
1043}
1044
1045static int getcwd(char *buff, int size)
1046{
1047 mm_segment_t old_fs;
1048 int ret;
1049
1050 old_fs = get_fs();
1051 set_fs(KERNEL_DS);
1052
1053 ret = sys_getcwd(buff, size);
1054
1055 set_fs(old_fs);
1056
1057 return ret;
1058}
1059
1060/* checks VPE is unused and gets ready to load program */
1061static int vpe_open(struct inode *inode, struct file *filp)
1062{
1063 enum vpe_state state;
1064 struct vpe_notifications *not;
1065 struct vpe *v;
1066 int ret;
1067
1068 if (minor != iminor(inode)) {
1069 /* assume only 1 device at the moment. */
1070 pr_warning("VPE loader: only vpe1 is supported\n");
1071
1072 return -ENODEV;
1073 }
1074
1075 if ((v = get_vpe(tclimit)) == NULL) {
1076 pr_warning("VPE loader: unable to get vpe\n");
1077
1078 return -ENODEV;
1079 }
1080
1081 state = xchg(&v->state, VPE_STATE_INUSE);
1082 if (state != VPE_STATE_UNUSED) {
1083 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1084
1085 list_for_each_entry(not, &v->notify, list) {
1086 not->stop(tclimit);
1087 }
1088
1089 release_progmem(v->load_addr);
1090 cleanup_tc(get_tc(tclimit));
1091 }
1092
1093 /* this of-course trashes what was there before... */
1094 v->pbuffer = vmalloc(P_SIZE);
1095 v->plen = P_SIZE;
1096 v->load_addr = NULL;
1097 v->len = 0;
1098
1099 v->uid = filp->f_cred->fsuid;
1100 v->gid = filp->f_cred->fsgid;
1101
1102#ifdef CONFIG_MIPS_APSP_KSPD
1103 /* get kspd to tell us when a syscall_exit happens */
1104 if (!kspd_events_reqd) {
1105 kspd_notify(&kspd_events);
1106 kspd_events_reqd++;
1107 }
1108#endif
1109
1110 v->cwd[0] = 0;
1111 ret = getcwd(v->cwd, VPE_PATH_MAX);
1112 if (ret < 0)
1113 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1114
1115 v->shared_ptr = NULL;
1116 v->__start = 0;
1117
1118 return 0;
1119}
1120
1121static int vpe_release(struct inode *inode, struct file *filp)
1122{
1123 struct vpe *v;
1124 Elf_Ehdr *hdr;
1125 int ret = 0;
1126
1127 v = get_vpe(tclimit);
1128 if (v == NULL)
1129 return -ENODEV;
1130
1131 hdr = (Elf_Ehdr *) v->pbuffer;
1132 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
1133 if (vpe_elfload(v) >= 0) {
1134 vpe_run(v);
1135 } else {
1136 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1137 ret = -ENOEXEC;
1138 }
1139 } else {
1140 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1141 ret = -ENOEXEC;
1142 }
1143
1144 /* It's good to be able to run the SP and if it chokes have a look at
1145 the /dev/rt?. But if we reset the pointer to the shared struct we
1146 lose what has happened. So perhaps if garbage is sent to the vpe
1147 device, use it as a trigger for the reset. Hopefully a nice
1148 executable will be along shortly. */
1149 if (ret < 0)
1150 v->shared_ptr = NULL;
1151
1152 // cleanup any temp buffers
1153 if (v->pbuffer)
1154 vfree(v->pbuffer);
1155 v->plen = 0;
1156 return ret;
1157}
1158
1159static ssize_t vpe_write(struct file *file, const char __user * buffer,
1160 size_t count, loff_t * ppos)
1161{
1162 size_t ret = count;
1163 struct vpe *v;
1164
1165 if (iminor(file->f_path.dentry->d_inode) != minor)
1166 return -ENODEV;
1167
1168 v = get_vpe(tclimit);
1169 if (v == NULL)
1170 return -ENODEV;
1171
1172 if (v->pbuffer == NULL) {
1173 printk(KERN_ERR "VPE loader: no buffer for program\n");
1174 return -ENOMEM;
1175 }
1176
1177 if ((count + v->len) > v->plen) {
1178 printk(KERN_WARNING
1179 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1180 return -ENOMEM;
1181 }
1182
1183 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1184 if (!count)
1185 return -EFAULT;
1186
1187 v->len += count;
1188 return ret;
1189}
1190
1191static const struct file_operations vpe_fops = {
1192 .owner = THIS_MODULE,
1193 .open = vpe_open,
1194 .release = vpe_release,
1195 .write = vpe_write
1196};
1197
1198/* module wrapper entry points */
1199/* give me a vpe */
1200vpe_handle vpe_alloc(void)
1201{
1202 int i;
1203 struct vpe *v;
1204
1205 /* find a vpe */
1206 for (i = 1; i < MAX_VPES; i++) {
1207 if ((v = get_vpe(i)) != NULL) {
1208 v->state = VPE_STATE_INUSE;
1209 return v;
1210 }
1211 }
1212 return NULL;
1213}
1214
1215EXPORT_SYMBOL(vpe_alloc);
1216
1217/* start running from here */
1218int vpe_start(vpe_handle vpe, unsigned long start)
1219{
1220 struct vpe *v = vpe;
1221
1222 v->__start = start;
1223 return vpe_run(v);
1224}
1225
1226EXPORT_SYMBOL(vpe_start);
1227
1228/* halt it for now */
1229int vpe_stop(vpe_handle vpe)
1230{
1231 struct vpe *v = vpe;
1232 struct tc *t;
1233 unsigned int evpe_flags;
1234
1235 evpe_flags = dvpe();
1236
1237 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1238
1239 settc(t->index);
1240 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1241 }
1242
1243 evpe(evpe_flags);
1244
1245 return 0;
1246}
1247
1248EXPORT_SYMBOL(vpe_stop);
1249
1250/* I've done with it thank you */
1251int vpe_free(vpe_handle vpe)
1252{
1253 struct vpe *v = vpe;
1254 struct tc *t;
1255 unsigned int evpe_flags;
1256
1257 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1258 return -ENOEXEC;
1259 }
1260
1261 evpe_flags = dvpe();
1262
1263 /* Put MVPE's into 'configuration state' */
1264 set_c0_mvpcontrol(MVPCONTROL_VPC);
1265
1266 settc(t->index);
1267 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1268
1269 /* halt the TC */
1270 write_tc_c0_tchalt(TCHALT_H);
1271 mips_ihb();
1272
1273 /* mark the TC unallocated */
1274 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1275
1276 v->state = VPE_STATE_UNUSED;
1277
1278 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1279 evpe(evpe_flags);
1280
1281 return 0;
1282}
1283
1284EXPORT_SYMBOL(vpe_free);
1285
1286void *vpe_get_shared(int index)
1287{
1288 struct vpe *v;
1289
1290 if ((v = get_vpe(index)) == NULL)
1291 return NULL;
1292
1293 return v->shared_ptr;
1294}
1295
1296EXPORT_SYMBOL(vpe_get_shared);
1297
1298int vpe_getuid(int index)
1299{
1300 struct vpe *v;
1301
1302 if ((v = get_vpe(index)) == NULL)
1303 return -1;
1304
1305 return v->uid;
1306}
1307
1308EXPORT_SYMBOL(vpe_getuid);
1309
1310int vpe_getgid(int index)
1311{
1312 struct vpe *v;
1313
1314 if ((v = get_vpe(index)) == NULL)
1315 return -1;
1316
1317 return v->gid;
1318}
1319
1320EXPORT_SYMBOL(vpe_getgid);
1321
1322int vpe_notify(int index, struct vpe_notifications *notify)
1323{
1324 struct vpe *v;
1325
1326 if ((v = get_vpe(index)) == NULL)
1327 return -1;
1328
1329 list_add(¬ify->list, &v->notify);
1330 return 0;
1331}
1332
1333EXPORT_SYMBOL(vpe_notify);
1334
1335char *vpe_getcwd(int index)
1336{
1337 struct vpe *v;
1338
1339 if ((v = get_vpe(index)) == NULL)
1340 return NULL;
1341
1342 return v->cwd;
1343}
1344
1345EXPORT_SYMBOL(vpe_getcwd);
1346
1347#ifdef CONFIG_MIPS_APSP_KSPD
1348static void kspd_sp_exit( int sp_id)
1349{
1350 cleanup_tc(get_tc(sp_id));
1351}
1352#endif
1353
1354static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
1355 const char *buf, size_t len)
1356{
1357 struct vpe *vpe = get_vpe(tclimit);
1358 struct vpe_notifications *not;
1359
1360 list_for_each_entry(not, &vpe->notify, list) {
1361 not->stop(tclimit);
1362 }
1363
1364 release_progmem(vpe->load_addr);
1365 cleanup_tc(get_tc(tclimit));
1366 vpe_stop(vpe);
1367 vpe_free(vpe);
1368
1369 return len;
1370}
1371
1372static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr,
1373 char *buf)
1374{
1375 struct vpe *vpe = get_vpe(tclimit);
1376
1377 return sprintf(buf, "%d\n", vpe->ntcs);
1378}
1379
1380static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr,
1381 const char *buf, size_t len)
1382{
1383 struct vpe *vpe = get_vpe(tclimit);
1384 unsigned long new;
1385 char *endp;
1386
1387 new = simple_strtoul(buf, &endp, 0);
1388 if (endp == buf)
1389 goto out_einval;
1390
1391 if (new == 0 || new > (hw_tcs - tclimit))
1392 goto out_einval;
1393
1394 vpe->ntcs = new;
1395
1396 return len;
1397
1398out_einval:
1399 return -EINVAL;
1400}
1401
1402static struct device_attribute vpe_class_attributes[] = {
1403 __ATTR(kill, S_IWUSR, NULL, store_kill),
1404 __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
1405 {}
1406};
1407
1408static void vpe_device_release(struct device *cd)
1409{
1410 kfree(cd);
1411}
1412
1413struct class vpe_class = {
1414 .name = "vpe",
1415 .owner = THIS_MODULE,
1416 .dev_release = vpe_device_release,
1417 .dev_attrs = vpe_class_attributes,
1418};
1419
1420struct device vpe_device;
1421
1422static int __init vpe_module_init(void)
1423{
1424 unsigned int mtflags, vpflags;
1425 unsigned long flags, val;
1426 struct vpe *v = NULL;
1427 struct tc *t;
1428 int tc, err;
1429
1430 if (!cpu_has_mipsmt) {
1431 printk("VPE loader: not a MIPS MT capable processor\n");
1432 return -ENODEV;
1433 }
1434
1435 if (vpelimit == 0) {
1436 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1437 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1438 "kernel argument\n");
1439
1440 return -ENODEV;
1441 }
1442
1443 if (tclimit == 0) {
1444 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1445 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1446 "kernel argument\n");
1447
1448 return -ENODEV;
1449 }
1450
1451 major = register_chrdev(0, module_name, &vpe_fops);
1452 if (major < 0) {
1453 printk("VPE loader: unable to register character device\n");
1454 return major;
1455 }
1456
1457 err = class_register(&vpe_class);
1458 if (err) {
1459 printk(KERN_ERR "vpe_class registration failed\n");
1460 goto out_chrdev;
1461 }
1462
1463 device_initialize(&vpe_device);
1464 vpe_device.class = &vpe_class,
1465 vpe_device.parent = NULL,
1466 dev_set_name(&vpe_device, "vpe1");
1467 vpe_device.devt = MKDEV(major, minor);
1468 err = device_add(&vpe_device);
1469 if (err) {
1470 printk(KERN_ERR "Adding vpe_device failed\n");
1471 goto out_class;
1472 }
1473
1474 local_irq_save(flags);
1475 mtflags = dmt();
1476 vpflags = dvpe();
1477
1478 /* Put MVPE's into 'configuration state' */
1479 set_c0_mvpcontrol(MVPCONTROL_VPC);
1480
1481 /* dump_mtregs(); */
1482
1483 val = read_c0_mvpconf0();
1484 hw_tcs = (val & MVPCONF0_PTC) + 1;
1485 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1486
1487 for (tc = tclimit; tc < hw_tcs; tc++) {
1488 /*
1489 * Must re-enable multithreading temporarily or in case we
1490 * reschedule send IPIs or similar we might hang.
1491 */
1492 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1493 evpe(vpflags);
1494 emt(mtflags);
1495 local_irq_restore(flags);
1496 t = alloc_tc(tc);
1497 if (!t) {
1498 err = -ENOMEM;
1499 goto out;
1500 }
1501
1502 local_irq_save(flags);
1503 mtflags = dmt();
1504 vpflags = dvpe();
1505 set_c0_mvpcontrol(MVPCONTROL_VPC);
1506
1507 /* VPE's */
1508 if (tc < hw_tcs) {
1509 settc(tc);
1510
1511 if ((v = alloc_vpe(tc)) == NULL) {
1512 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1513
1514 goto out_reenable;
1515 }
1516
1517 v->ntcs = hw_tcs - tclimit;
1518
1519 /* add the tc to the list of this vpe's tc's. */
1520 list_add(&t->tc, &v->tc);
1521
1522 /* deactivate all but vpe0 */
1523 if (tc >= tclimit) {
1524 unsigned long tmp = read_vpe_c0_vpeconf0();
1525
1526 tmp &= ~VPECONF0_VPA;
1527
1528 /* master VPE */
1529 tmp |= VPECONF0_MVP;
1530 write_vpe_c0_vpeconf0(tmp);
1531 }
1532
1533 /* disable multi-threading with TC's */
1534 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1535
1536 if (tc >= vpelimit) {
1537 /*
1538 * Set config to be the same as vpe0,
1539 * particularly kseg0 coherency alg
1540 */
1541 write_vpe_c0_config(read_c0_config());
1542 }
1543 }
1544
1545 /* TC's */
1546 t->pvpe = v; /* set the parent vpe */
1547
1548 if (tc >= tclimit) {
1549 unsigned long tmp;
1550
1551 settc(tc);
1552
1553 /* Any TC that is bound to VPE0 gets left as is - in case
1554 we are running SMTC on VPE0. A TC that is bound to any
1555 other VPE gets bound to VPE0, ideally I'd like to make
1556 it homeless but it doesn't appear to let me bind a TC
1557 to a non-existent VPE. Which is perfectly reasonable.
1558
1559 The (un)bound state is visible to an EJTAG probe so may
1560 notify GDB...
1561 */
1562
1563 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1564 /* tc is bound >vpe0 */
1565 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1566
1567 t->pvpe = get_vpe(0); /* set the parent vpe */
1568 }
1569
1570 /* halt the TC */
1571 write_tc_c0_tchalt(TCHALT_H);
1572 mips_ihb();
1573
1574 tmp = read_tc_c0_tcstatus();
1575
1576 /* mark not activated and not dynamically allocatable */
1577 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1578 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1579 write_tc_c0_tcstatus(tmp);
1580 }
1581 }
1582
1583out_reenable:
1584 /* release config state */
1585 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1586
1587 evpe(vpflags);
1588 emt(mtflags);
1589 local_irq_restore(flags);
1590
1591#ifdef CONFIG_MIPS_APSP_KSPD
1592 kspd_events.kspd_sp_exit = kspd_sp_exit;
1593#endif
1594 return 0;
1595
1596out_class:
1597 class_unregister(&vpe_class);
1598out_chrdev:
1599 unregister_chrdev(major, module_name);
1600
1601out:
1602 return err;
1603}
1604
1605static void __exit vpe_module_exit(void)
1606{
1607 struct vpe *v, *n;
1608
1609 device_del(&vpe_device);
1610 unregister_chrdev(major, module_name);
1611
1612 /* No locking needed here */
1613 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1614 if (v->state != VPE_STATE_UNUSED)
1615 release_vpe(v);
1616 }
1617}
1618
1619module_init(vpe_module_init);
1620module_exit(vpe_module_exit);
1621MODULE_DESCRIPTION("MIPS VPE Loader");
1622MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1623MODULE_LICENSE("GPL");