2 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
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.
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
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.
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.
27 * To load and run, simply cat a SP 'program file' to /dev/vpe1.
28 * i.e cat spapp >/dev/vpe1.
31 #include <linux/config.h>
32 #include <linux/kernel.h>
33 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <asm/uaccess.h>
37 #include <linux/slab.h>
38 #include <linux/list.h>
39 #include <linux/vmalloc.h>
40 #include <linux/elf.h>
41 #include <linux/seq_file.h>
42 #include <linux/syscalls.h>
43 #include <linux/moduleloader.h>
44 #include <linux/interrupt.h>
45 #include <linux/poll.h>
46 #include <linux/bootmem.h>
47 #include <asm/mipsregs.h>
48 #include <asm/mipsmtregs.h>
49 #include <asm/cacheflush.h>
50 #include <asm/atomic.h>
52 #include <asm/processor.h>
53 #include <asm/system.h>
57 typedef void *vpe_handle
;
59 #ifndef ARCH_SHF_SMALL
60 #define ARCH_SHF_SMALL 0
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))
66 static char module_name
[] = "vpe";
69 #ifdef CONFIG_MIPS_APSP_KSPD
70 static struct kspd_notifications kspd_events
;
71 static int kspd_events_reqd
= 0;
74 /* grab the likely amount of memory we will need. */
75 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
76 #define P_SIZE (2 * 1024 * 1024)
78 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
79 #define P_SIZE (256 * 1024)
82 extern unsigned long physical_memsize
;
85 #define VPE_PATH_MAX 256
101 enum vpe_state state
;
103 /* (device) minor associated with this vpe */
106 /* elfloader stuff */
111 unsigned int uid
, gid
;
112 char cwd
[VPE_PATH_MAX
];
114 unsigned long __start
;
116 /* tc's associated with this vpe */
119 /* The list of vpe's */
120 struct list_head list
;
122 /* shared symbol address */
125 /* the list of who wants to know when something major happens */
126 struct list_head notify
;
136 /* The list of TC's with this VPE */
139 /* The global list of tc's */
140 struct list_head list
;
144 /* Virtual processing elements */
145 struct list_head vpe_list
;
147 /* Thread contexts */
148 struct list_head tc_list
;
151 static void release_progmem(void *ptr
);
152 /* static __attribute_used__ void dump_vpe(struct vpe * v); */
153 extern void save_gp_address(unsigned int secbase
, unsigned int rel
);
155 /* get the vpe associated with this minor */
156 struct vpe
*get_vpe(int minor
)
163 list_for_each_entry(v
, &vpecontrol
.vpe_list
, list
) {
164 if (v
->minor
== minor
)
171 /* get the vpe associated with this minor */
172 struct tc
*get_tc(int index
)
176 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
177 if (t
->index
== index
)
184 struct tc
*get_tc_unused(void)
188 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
189 if (t
->state
== TC_STATE_UNUSED
)
196 /* allocate a vpe and associate it with this minor (or index) */
197 struct vpe
*alloc_vpe(int minor
)
201 if ((v
= kzalloc(sizeof(struct vpe
), GFP_KERNEL
)) == NULL
) {
205 INIT_LIST_HEAD(&v
->tc
);
206 list_add_tail(&v
->list
, &vpecontrol
.vpe_list
);
208 INIT_LIST_HEAD(&v
->notify
);
213 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
214 struct tc
*alloc_tc(int index
)
218 if ((t
= kzalloc(sizeof(struct tc
), GFP_KERNEL
)) == NULL
) {
222 INIT_LIST_HEAD(&t
->tc
);
223 list_add_tail(&t
->list
, &vpecontrol
.tc_list
);
230 /* clean up and free everything */
231 void release_vpe(struct vpe
*v
)
239 void dump_mtregs(void)
243 val
= read_c0_config3();
244 printk("config3 0x%lx MT %ld\n", val
,
245 (val
& CONFIG3_MT
) >> CONFIG3_MT_SHIFT
);
247 val
= read_c0_mvpcontrol();
248 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val
,
249 (val
& MVPCONTROL_STLB
) >> MVPCONTROL_STLB_SHIFT
,
250 (val
& MVPCONTROL_VPC
) >> MVPCONTROL_VPC_SHIFT
,
251 (val
& MVPCONTROL_EVP
));
253 val
= read_c0_mvpconf0();
254 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val
,
255 (val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
,
256 val
& MVPCONF0_PTC
, (val
& MVPCONF0_M
) >> MVPCONF0_M_SHIFT
);
259 /* Find some VPE program space */
260 static void *alloc_progmem(unsigned long len
)
262 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
263 /* this means you must tell linux to use less memory than you physically have */
264 return pfn_to_kaddr(max_pfn
);
266 // simple grab some mem for now
267 return kmalloc(len
, GFP_KERNEL
);
271 static void release_progmem(void *ptr
)
273 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
278 /* Update size with this section: return offset. */
279 static long get_offset(unsigned long *size
, Elf_Shdr
* sechdr
)
283 ret
= ALIGN(*size
, sechdr
->sh_addralign
? : 1);
284 *size
= ret
+ sechdr
->sh_size
;
288 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
289 might -- code, read-only data, read-write data, small data. Tally
290 sizes, and place the offsets into sh_entsize fields: high bit means it
292 static void layout_sections(struct module
*mod
, const Elf_Ehdr
* hdr
,
293 Elf_Shdr
* sechdrs
, const char *secstrings
)
295 static unsigned long const masks
[][2] = {
296 /* NOTE: all executable code must be the first section
297 * in this array; otherwise modify the text_size
298 * finder in the two loops below */
299 {SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
300 {SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
301 {SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
302 {ARCH_SHF_SMALL
| SHF_ALLOC
, 0}
306 for (i
= 0; i
< hdr
->e_shnum
; i
++)
307 sechdrs
[i
].sh_entsize
= ~0UL;
309 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
310 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
311 Elf_Shdr
*s
= &sechdrs
[i
];
313 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
314 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
315 || (s
->sh_flags
& masks
[m
][1])
316 || s
->sh_entsize
!= ~0UL)
318 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
322 mod
->core_text_size
= mod
->core_size
;
328 /* from module-elf32.c, but subverted a little */
331 struct mips_hi16
*next
;
336 static struct mips_hi16
*mips_hi16_list
;
337 static unsigned int gp_offs
, gp_addr
;
339 static int apply_r_mips_none(struct module
*me
, uint32_t *location
,
345 static int apply_r_mips_gprel16(struct module
*me
, uint32_t *location
,
350 if( !(*location
& 0xffff) ) {
351 rel
= (int)v
- gp_addr
;
354 /* .sbss + gp(relative) + offset */
356 rel
= (int)(short)((int)v
+ gp_offs
+
357 (int)(short)(*location
& 0xffff) - gp_addr
);
360 if( (rel
> 32768) || (rel
< -32768) ) {
361 printk(KERN_DEBUG
"VPE loader: apply_r_mips_gprel16: "
362 "relative address 0x%x out of range of gp register\n",
367 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
372 static int apply_r_mips_pc16(struct module
*me
, uint32_t *location
,
376 rel
= (((unsigned int)v
- (unsigned int)location
));
377 rel
>>= 2; // because the offset is in _instructions_ not bytes.
378 rel
-= 1; // and one instruction less due to the branch delay slot.
380 if( (rel
> 32768) || (rel
< -32768) ) {
381 printk(KERN_DEBUG
"VPE loader: "
382 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel
);
386 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
391 static int apply_r_mips_32(struct module
*me
, uint32_t *location
,
399 static int apply_r_mips_26(struct module
*me
, uint32_t *location
,
403 printk(KERN_DEBUG
"VPE loader: apply_r_mips_26 "
404 " unaligned relocation\n");
409 * Not desperately convinced this is a good check of an overflow condition
410 * anyway. But it gets in the way of handling undefined weak symbols which
411 * we want to set to zero.
412 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
414 * "module %s: relocation overflow\n",
420 *location
= (*location
& ~0x03ffffff) |
421 ((*location
+ (v
>> 2)) & 0x03ffffff);
425 static int apply_r_mips_hi16(struct module
*me
, uint32_t *location
,
431 * We cannot relocate this one now because we don't know the value of
432 * the carry we need to add. Save the information, and let LO16 do the
435 n
= kmalloc(sizeof *n
, GFP_KERNEL
);
441 n
->next
= mips_hi16_list
;
447 static int apply_r_mips_lo16(struct module
*me
, uint32_t *location
,
450 unsigned long insnlo
= *location
;
451 Elf32_Addr val
, vallo
;
453 /* Sign extend the addend we extract from the lo insn. */
454 vallo
= ((insnlo
& 0xffff) ^ 0x8000) - 0x8000;
456 if (mips_hi16_list
!= NULL
) {
461 struct mips_hi16
*next
;
465 * The value for the HI16 had best be the same.
468 printk(KERN_DEBUG
"VPE loader: "
469 "apply_r_mips_lo16/hi16: "
470 "inconsistent value information\n");
475 * Do the HI16 relocation. Note that we actually don't
476 * need to know anything about the LO16 itself, except
477 * where to find the low 16 bits of the addend needed
481 val
= ((insn
& 0xffff) << 16) + vallo
;
485 * Account for the sign extension that will happen in
488 val
= ((val
>> 16) + ((val
& 0x8000) != 0)) & 0xffff;
490 insn
= (insn
& ~0xffff) | val
;
498 mips_hi16_list
= NULL
;
502 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
505 insnlo
= (insnlo
& ~0xffff) | (val
& 0xffff);
511 static int (*reloc_handlers
[]) (struct module
*me
, uint32_t *location
,
513 [R_MIPS_NONE
] = apply_r_mips_none
,
514 [R_MIPS_32
] = apply_r_mips_32
,
515 [R_MIPS_26
] = apply_r_mips_26
,
516 [R_MIPS_HI16
] = apply_r_mips_hi16
,
517 [R_MIPS_LO16
] = apply_r_mips_lo16
,
518 [R_MIPS_GPREL16
] = apply_r_mips_gprel16
,
519 [R_MIPS_PC16
] = apply_r_mips_pc16
522 static char *rstrs
[] = {
523 [R_MIPS_NONE
] = "MIPS_NONE",
524 [R_MIPS_32
] = "MIPS_32",
525 [R_MIPS_26
] = "MIPS_26",
526 [R_MIPS_HI16
] = "MIPS_HI16",
527 [R_MIPS_LO16
] = "MIPS_LO16",
528 [R_MIPS_GPREL16
] = "MIPS_GPREL16",
529 [R_MIPS_PC16
] = "MIPS_PC16"
532 int apply_relocations(Elf32_Shdr
*sechdrs
,
534 unsigned int symindex
,
538 Elf32_Rel
*rel
= (void *) sechdrs
[relsec
].sh_addr
;
545 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
546 Elf32_Word r_info
= rel
[i
].r_info
;
548 /* This is where to make the change */
549 location
= (void *)sechdrs
[sechdrs
[relsec
].sh_info
].sh_addr
551 /* This is the symbol it is referring to */
552 sym
= (Elf32_Sym
*)sechdrs
[symindex
].sh_addr
553 + ELF32_R_SYM(r_info
);
555 if (!sym
->st_value
) {
556 printk(KERN_DEBUG
"%s: undefined weak symbol %s\n",
557 me
->name
, strtab
+ sym
->st_name
);
558 /* just print the warning, dont barf */
563 res
= reloc_handlers
[ELF32_R_TYPE(r_info
)](me
, location
, v
);
565 char *r
= rstrs
[ELF32_R_TYPE(r_info
)];
566 printk(KERN_WARNING
"VPE loader: .text+0x%x "
567 "relocation type %s for symbol \"%s\" failed\n",
568 rel
[i
].r_offset
, r
? r
: "UNKNOWN",
569 strtab
+ sym
->st_name
);
577 void save_gp_address(unsigned int secbase
, unsigned int rel
)
579 gp_addr
= secbase
+ rel
;
580 gp_offs
= gp_addr
- (secbase
& 0xffff0000);
582 /* end module-elf32.c */
586 /* Change all symbols so that sh_value encodes the pointer directly. */
587 static void simplify_symbols(Elf_Shdr
* sechdrs
,
588 unsigned int symindex
,
590 const char *secstrings
,
591 unsigned int nsecs
, struct module
*mod
)
593 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
594 unsigned long secbase
, bssbase
= 0;
595 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
598 /* find the .bss section for COMMON symbols */
599 for (i
= 0; i
< nsecs
; i
++) {
600 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) == 0) {
601 bssbase
= sechdrs
[i
].sh_addr
;
606 for (i
= 1; i
< n
; i
++) {
607 switch (sym
[i
].st_shndx
) {
609 /* Allocate space for the symbol in the .bss section.
610 st_value is currently size.
611 We want it to have the address of the symbol. */
613 size
= sym
[i
].st_value
;
614 sym
[i
].st_value
= bssbase
;
620 /* Don't need to do anything */
627 case SHN_MIPS_SCOMMON
:
628 printk(KERN_DEBUG
"simplify_symbols: ignoring SHN_MIPS_SCOMMON"
629 "symbol <%s> st_shndx %d\n", strtab
+ sym
[i
].st_name
,
635 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
637 if (strncmp(strtab
+ sym
[i
].st_name
, "_gp", 3) == 0) {
638 save_gp_address(secbase
, sym
[i
].st_value
);
641 sym
[i
].st_value
+= secbase
;
647 #ifdef DEBUG_ELFLOADER
648 static void dump_elfsymbols(Elf_Shdr
* sechdrs
, unsigned int symindex
,
649 const char *strtab
, struct module
*mod
)
651 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
652 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
654 printk(KERN_DEBUG
"dump_elfsymbols: n %d\n", n
);
655 for (i
= 1; i
< n
; i
++) {
656 printk(KERN_DEBUG
" i %d name <%s> 0x%x\n", i
,
657 strtab
+ sym
[i
].st_name
, sym
[i
].st_value
);
662 static void dump_tc(struct tc
*t
)
667 printk(KERN_DEBUG
"VPE loader: TC index %d targtc %ld "
668 "TCStatus 0x%lx halt 0x%lx\n",
669 t
->index
, read_c0_vpecontrol() & VPECONTROL_TARGTC
,
670 read_tc_c0_tcstatus(), read_tc_c0_tchalt());
672 printk(KERN_DEBUG
" tcrestart 0x%lx\n", read_tc_c0_tcrestart());
673 printk(KERN_DEBUG
" tcbind 0x%lx\n", read_tc_c0_tcbind());
675 val
= read_c0_vpeconf0();
676 printk(KERN_DEBUG
" VPEConf0 0x%lx MVP %ld\n", val
,
677 (val
& VPECONF0_MVP
) >> VPECONF0_MVP_SHIFT
);
679 printk(KERN_DEBUG
" c0 status 0x%lx\n", read_vpe_c0_status());
680 printk(KERN_DEBUG
" c0 cause 0x%lx\n", read_vpe_c0_cause());
682 printk(KERN_DEBUG
" c0 badvaddr 0x%lx\n", read_vpe_c0_badvaddr());
683 printk(KERN_DEBUG
" c0 epc 0x%lx\n", read_vpe_c0_epc());
686 static void dump_tclist(void)
690 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
695 /* We are prepared so configure and start the VPE... */
696 int vpe_run(struct vpe
* v
)
698 struct vpe_notifications
*n
;
699 unsigned long val
, dmt_flag
;
702 /* check we are the Master VPE */
703 val
= read_c0_vpeconf0();
704 if (!(val
& VPECONF0_MVP
)) {
706 "VPE loader: only Master VPE's are allowed to configure MT\n");
710 /* disable MT (using dvpe) */
713 if (!list_empty(&v
->tc
)) {
714 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
715 printk(KERN_WARNING
"VPE loader: TC %d is already in use.\n",
720 printk(KERN_WARNING
"VPE loader: No TC's associated with VPE %d\n",
725 /* Put MVPE's into 'configuration state' */
726 set_c0_mvpcontrol(MVPCONTROL_VPC
);
730 /* should check it is halted, and not activated */
731 if ((read_tc_c0_tcstatus() & TCSTATUS_A
) || !(read_tc_c0_tchalt() & TCHALT_H
)) {
732 printk(KERN_WARNING
"VPE loader: TC %d is already doing something!\n",
739 * Disable multi-threaded execution whilst we activate, clear the
740 * halt bit and bound the tc to the other VPE...
744 /* Write the address we want it to start running from in the TCPC register. */
745 write_tc_c0_tcrestart((unsigned long)v
->__start
);
746 write_tc_c0_tccontext((unsigned long)0);
748 * Mark the TC as activated, not interrupt exempt and not dynamically
751 val
= read_tc_c0_tcstatus();
752 val
= (val
& ~(TCSTATUS_DA
| TCSTATUS_IXMT
)) | TCSTATUS_A
;
753 write_tc_c0_tcstatus(val
);
755 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H
);
758 * The sde-kit passes 'memsize' to __start in $a3, so set something
759 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
760 * DFLT_HEAP_SIZE when you compile your program
762 mttgpr(7, physical_memsize
);
767 * bind the TC to VPE 1 as late as possible so we only have the final
768 * VPE registers to set up, and so an EJTAG probe can trigger on it
770 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE
) | v
->minor
);
772 /* Set up the XTC bit in vpeconf0 to point at our tc */
773 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC
))
774 | (t
->index
<< VPECONF0_XTC_SHIFT
));
776 /* enable this VPE */
777 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA
);
779 /* clear out any left overs from a previous program */
780 write_vpe_c0_status(0);
781 write_vpe_c0_cause(0);
783 /* take system out of configuration state */
784 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
786 /* now safe to re-enable multi-threading */
792 list_for_each_entry(n
, &v
->notify
, list
) {
799 static int find_vpe_symbols(struct vpe
* v
, Elf_Shdr
* sechdrs
,
800 unsigned int symindex
, const char *strtab
,
803 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
804 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
806 for (i
= 1; i
< n
; i
++) {
807 if (strcmp(strtab
+ sym
[i
].st_name
, "__start") == 0) {
808 v
->__start
= sym
[i
].st_value
;
811 if (strcmp(strtab
+ sym
[i
].st_name
, "vpe_shared") == 0) {
812 v
->shared_ptr
= (void *)sym
[i
].st_value
;
816 if ( (v
->__start
== 0) || (v
->shared_ptr
== NULL
))
823 * Allocates a VPE with some program code space(the load address), copies the
824 * contents of the program (p)buffer performing relocatations/etc, free's it
827 int vpe_elfload(struct vpe
* v
)
832 char *secstrings
, *strtab
= NULL
;
833 unsigned int len
, i
, symindex
= 0, strindex
= 0, relocate
= 0;
834 struct module mod
; // so we can re-use the relocations code
836 memset(&mod
, 0, sizeof(struct module
));
837 strcpy(mod
.name
, "VPE loader");
839 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
842 /* Sanity checks against insmoding binaries or wrong arch,
844 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
845 || (hdr
->e_type
!= ET_REL
&& hdr
->e_type
!= ET_EXEC
)
846 || !elf_check_arch(hdr
)
847 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
849 "VPE loader: program wrong arch or weird elf version\n");
854 if (hdr
->e_type
== ET_REL
)
857 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
)) {
858 printk(KERN_ERR
"VPE loader: program length %u truncated\n",
864 /* Convenience variables */
865 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
866 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
867 sechdrs
[0].sh_addr
= 0;
869 /* And these should exist, but gcc whinges if we don't init them */
870 symindex
= strindex
= 0;
873 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
874 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
875 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
) {
876 printk(KERN_ERR
"VPE program length %u truncated\n",
881 /* Mark all sections sh_addr with their address in the
883 sechdrs
[i
].sh_addr
= (size_t) hdr
+ sechdrs
[i
].sh_offset
;
885 /* Internal symbols and strings. */
886 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
888 strindex
= sechdrs
[i
].sh_link
;
889 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
892 layout_sections(&mod
, hdr
, sechdrs
, secstrings
);
895 v
->load_addr
= alloc_progmem(mod
.core_size
);
896 memset(v
->load_addr
, 0, mod
.core_size
);
898 printk("VPE loader: loading to %p\n", v
->load_addr
);
901 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
904 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
907 dest
= v
->load_addr
+ sechdrs
[i
].sh_entsize
;
909 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
910 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
912 /* Update sh_addr to point to copy in image. */
913 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
915 printk(KERN_DEBUG
" section sh_name %s sh_addr 0x%x\n",
916 secstrings
+ sechdrs
[i
].sh_name
, sechdrs
[i
].sh_addr
);
919 /* Fix up syms, so that st_value is a pointer to location. */
920 simplify_symbols(sechdrs
, symindex
, strtab
, secstrings
,
923 /* Now do relocations. */
924 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
925 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
926 unsigned int info
= sechdrs
[i
].sh_info
;
928 /* Not a valid relocation section? */
929 if (info
>= hdr
->e_shnum
)
932 /* Don't bother with non-allocated sections */
933 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
936 if (sechdrs
[i
].sh_type
== SHT_REL
)
937 err
= apply_relocations(sechdrs
, strtab
, symindex
, i
,
939 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
940 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
947 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
949 /* Internal symbols and strings. */
950 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
952 strindex
= sechdrs
[i
].sh_link
;
953 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
955 /* mark the symtab's address for when we try to find the
957 sechdrs
[i
].sh_addr
= (size_t) hdr
+ sechdrs
[i
].sh_offset
;
960 /* filter sections we dont want in the final image */
961 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
962 (sechdrs
[i
].sh_type
== SHT_MIPS_REGINFO
)) {
963 printk( KERN_DEBUG
" ignoring section, "
964 "name %s type %x address 0x%x \n",
965 secstrings
+ sechdrs
[i
].sh_name
,
966 sechdrs
[i
].sh_type
, sechdrs
[i
].sh_addr
);
970 if (sechdrs
[i
].sh_addr
< (unsigned int)v
->load_addr
) {
971 printk( KERN_WARNING
"VPE loader: "
972 "fully linked image has invalid section, "
973 "name %s type %x address 0x%x, before load "
975 secstrings
+ sechdrs
[i
].sh_name
,
976 sechdrs
[i
].sh_type
, sechdrs
[i
].sh_addr
,
977 (unsigned int)v
->load_addr
);
981 printk(KERN_DEBUG
" copying section sh_name %s, sh_addr 0x%x "
982 "size 0x%x0 from x%p\n",
983 secstrings
+ sechdrs
[i
].sh_name
, sechdrs
[i
].sh_addr
,
984 sechdrs
[i
].sh_size
, hdr
+ sechdrs
[i
].sh_offset
);
986 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
987 memcpy((void *)sechdrs
[i
].sh_addr
,
988 (char *)hdr
+ sechdrs
[i
].sh_offset
,
991 memset((void *)sechdrs
[i
].sh_addr
, 0, sechdrs
[i
].sh_size
);
995 /* make sure it's physically written out */
996 flush_icache_range((unsigned long)v
->load_addr
,
997 (unsigned long)v
->load_addr
+ v
->len
);
999 if ((find_vpe_symbols(v
, sechdrs
, symindex
, strtab
, &mod
)) < 0) {
1000 if (v
->__start
== 0) {
1001 printk(KERN_WARNING
"VPE loader: program does not contain "
1002 "a __start symbol\n");
1006 if (v
->shared_ptr
== NULL
)
1007 printk(KERN_WARNING
"VPE loader: "
1008 "program does not contain vpe_shared symbol.\n"
1009 " Unable to use AMVP (AP/SP) facilities.\n");
1012 printk(" elf loaded\n");
1016 __attribute_used__
void dump_vpe(struct vpe
* v
)
1022 printk(KERN_DEBUG
"VPEControl 0x%lx\n", read_vpe_c0_vpecontrol());
1023 printk(KERN_DEBUG
"VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0());
1025 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
)
1029 static void cleanup_tc(struct tc
*tc
)
1033 /* Put MVPE's into 'configuration state' */
1034 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1037 tmp
= read_tc_c0_tcstatus();
1039 /* mark not allocated and not dynamically allocatable */
1040 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
1041 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
1042 write_tc_c0_tcstatus(tmp
);
1044 write_tc_c0_tchalt(TCHALT_H
);
1046 /* bind it to anything other than VPE1 */
1047 write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE
); // | TCBIND_CURVPE
1049 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1052 static int getcwd(char *buff
, int size
)
1054 mm_segment_t old_fs
;
1060 ret
= sys_getcwd(buff
,size
);
1067 /* checks VPE is unused and gets ready to load program */
1068 static int vpe_open(struct inode
*inode
, struct file
*filp
)
1072 struct vpe_notifications
*not;
1074 /* assume only 1 device at the mo. */
1075 if ((minor
= iminor(inode
)) != 1) {
1076 printk(KERN_WARNING
"VPE loader: only vpe1 is supported\n");
1080 if ((v
= get_vpe(minor
)) == NULL
) {
1081 printk(KERN_WARNING
"VPE loader: unable to get vpe\n");
1085 if (v
->state
!= VPE_STATE_UNUSED
) {
1088 printk(KERN_DEBUG
"VPE loader: tc in use dumping regs\n");
1090 dump_tc(get_tc(minor
));
1092 list_for_each_entry(not, &v
->notify
, list
) {
1096 release_progmem(v
->load_addr
);
1097 cleanup_tc(get_tc(minor
));
1100 // allocate it so when we get write ops we know it's expected.
1101 v
->state
= VPE_STATE_INUSE
;
1103 /* this of-course trashes what was there before... */
1104 v
->pbuffer
= vmalloc(P_SIZE
);
1106 v
->load_addr
= NULL
;
1109 v
->uid
= filp
->f_uid
;
1110 v
->gid
= filp
->f_gid
;
1112 #ifdef CONFIG_MIPS_APSP_KSPD
1113 /* get kspd to tell us when a syscall_exit happens */
1114 if (!kspd_events_reqd
) {
1115 kspd_notify(&kspd_events
);
1121 ret
= getcwd(v
->cwd
, VPE_PATH_MAX
);
1123 printk(KERN_WARNING
"VPE loader: open, getcwd returned %d\n", ret
);
1125 v
->shared_ptr
= NULL
;
1130 static int vpe_release(struct inode
*inode
, struct file
*filp
)
1136 minor
= iminor(inode
);
1137 if ((v
= get_vpe(minor
)) == NULL
)
1140 // simple case of fire and forget, so tell the VPE to run...
1142 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
1143 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) == 0) {
1144 if (vpe_elfload(v
) >= 0)
1147 printk(KERN_WARNING
"VPE loader: ELF load failed.\n");
1151 printk(KERN_WARNING
"VPE loader: only elf files are supported\n");
1155 /* It's good to be able to run the SP and if it chokes have a look at
1156 the /dev/rt?. But if we reset the pointer to the shared struct we
1157 loose what has happened. So perhaps if garbage is sent to the vpe
1158 device, use it as a trigger for the reset. Hopefully a nice
1159 executable will be along shortly. */
1161 v
->shared_ptr
= NULL
;
1163 // cleanup any temp buffers
1170 static ssize_t
vpe_write(struct file
*file
, const char __user
* buffer
,
1171 size_t count
, loff_t
* ppos
)
1177 minor
= iminor(file
->f_dentry
->d_inode
);
1178 if ((v
= get_vpe(minor
)) == NULL
)
1181 if (v
->pbuffer
== NULL
) {
1182 printk(KERN_ERR
"VPE loader: no buffer for program\n");
1186 if ((count
+ v
->len
) > v
->plen
) {
1188 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1192 count
-= copy_from_user(v
->pbuffer
+ v
->len
, buffer
, count
);
1200 static struct file_operations vpe_fops
= {
1201 .owner
= THIS_MODULE
,
1203 .release
= vpe_release
,
1207 /* module wrapper entry points */
1209 vpe_handle
vpe_alloc(void)
1215 for (i
= 1; i
< MAX_VPES
; i
++) {
1216 if ((v
= get_vpe(i
)) != NULL
) {
1217 v
->state
= VPE_STATE_INUSE
;
1224 EXPORT_SYMBOL(vpe_alloc
);
1226 /* start running from here */
1227 int vpe_start(vpe_handle vpe
, unsigned long start
)
1229 struct vpe
*v
= vpe
;
1235 EXPORT_SYMBOL(vpe_start
);
1237 /* halt it for now */
1238 int vpe_stop(vpe_handle vpe
)
1240 struct vpe
*v
= vpe
;
1242 unsigned int evpe_flags
;
1244 evpe_flags
= dvpe();
1246 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) != NULL
) {
1249 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1257 EXPORT_SYMBOL(vpe_stop
);
1259 /* I've done with it thank you */
1260 int vpe_free(vpe_handle vpe
)
1262 struct vpe
*v
= vpe
;
1264 unsigned int evpe_flags
;
1266 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
1270 evpe_flags
= dvpe();
1272 /* Put MVPE's into 'configuration state' */
1273 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1276 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1278 /* mark the TC unallocated and halt'ed */
1279 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A
);
1280 write_tc_c0_tchalt(TCHALT_H
);
1282 v
->state
= VPE_STATE_UNUSED
;
1284 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1290 EXPORT_SYMBOL(vpe_free
);
1292 void *vpe_get_shared(int index
)
1296 if ((v
= get_vpe(index
)) == NULL
)
1299 return v
->shared_ptr
;
1302 EXPORT_SYMBOL(vpe_get_shared
);
1304 int vpe_getuid(int index
)
1308 if ((v
= get_vpe(index
)) == NULL
)
1314 EXPORT_SYMBOL(vpe_getuid
);
1316 int vpe_getgid(int index
)
1320 if ((v
= get_vpe(index
)) == NULL
)
1326 EXPORT_SYMBOL(vpe_getgid
);
1328 int vpe_notify(int index
, struct vpe_notifications
*notify
)
1332 if ((v
= get_vpe(index
)) == NULL
)
1335 list_add(¬ify
->list
, &v
->notify
);
1339 EXPORT_SYMBOL(vpe_notify
);
1341 char *vpe_getcwd(int index
)
1345 if ((v
= get_vpe(index
)) == NULL
)
1351 EXPORT_SYMBOL(vpe_getcwd
);
1353 #ifdef CONFIG_MIPS_APSP_KSPD
1354 static void kspd_sp_exit( int sp_id
)
1356 cleanup_tc(get_tc(sp_id
));
1360 static int __init
vpe_module_init(void)
1362 struct vpe
*v
= NULL
;
1367 if (!cpu_has_mipsmt
) {
1368 printk("VPE loader: not a MIPS MT capable processor\n");
1372 major
= register_chrdev(0, module_name
, &vpe_fops
);
1374 printk("VPE loader: unable to register character device\n");
1381 /* Put MVPE's into 'configuration state' */
1382 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1384 /* dump_mtregs(); */
1386 INIT_LIST_HEAD(&vpecontrol
.vpe_list
);
1387 INIT_LIST_HEAD(&vpecontrol
.tc_list
);
1389 val
= read_c0_mvpconf0();
1390 for (i
= 0; i
< ((val
& MVPCONF0_PTC
) + 1); i
++) {
1394 if (i
< ((val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
) + 1) {
1397 if ((v
= alloc_vpe(i
)) == NULL
) {
1398 printk(KERN_WARNING
"VPE: unable to allocate VPE\n");
1402 /* add the tc to the list of this vpe's tc's. */
1403 list_add(&t
->tc
, &v
->tc
);
1405 /* deactivate all but vpe0 */
1407 unsigned long tmp
= read_vpe_c0_vpeconf0();
1409 tmp
&= ~VPECONF0_VPA
;
1412 tmp
|= VPECONF0_MVP
;
1413 write_vpe_c0_vpeconf0(tmp
);
1416 /* disable multi-threading with TC's */
1417 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE
);
1420 write_vpe_c0_status((read_c0_status() &
1421 ~(ST0_IM
| ST0_IE
| ST0_KSU
))
1425 * Set config to be the same as vpe0,
1426 * particularly kseg0 coherency alg
1428 write_vpe_c0_config(read_c0_config());
1433 t
->pvpe
= v
; /* set the parent vpe */
1440 /* Any TC that is bound to VPE0 gets left as is - in case
1441 we are running SMTC on VPE0. A TC that is bound to any
1442 other VPE gets bound to VPE0, ideally I'd like to make
1443 it homeless but it doesn't appear to let me bind a TC
1444 to a non-existent VPE. Which is perfectly reasonable.
1446 The (un)bound state is visible to an EJTAG probe so may
1450 if (((tmp
= read_tc_c0_tcbind()) & TCBIND_CURVPE
)) {
1451 /* tc is bound >vpe0 */
1452 write_tc_c0_tcbind(tmp
& ~TCBIND_CURVPE
);
1454 t
->pvpe
= get_vpe(0); /* set the parent vpe */
1457 tmp
= read_tc_c0_tcstatus();
1459 /* mark not activated and not dynamically allocatable */
1460 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
1461 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
1462 write_tc_c0_tcstatus(tmp
);
1464 write_tc_c0_tchalt(TCHALT_H
);
1468 /* release config state */
1469 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1471 #ifdef CONFIG_MIPS_APSP_KSPD
1472 kspd_events
.kspd_sp_exit
= kspd_sp_exit
;
1477 static void __exit
vpe_module_exit(void)
1481 list_for_each_entry_safe(v
, n
, &vpecontrol
.vpe_list
, list
) {
1482 if (v
->state
!= VPE_STATE_UNUSED
) {
1487 unregister_chrdev(major
, module_name
);
1490 module_init(vpe_module_init
);
1491 module_exit(vpe_module_exit
);
1492 MODULE_DESCRIPTION("MIPS VPE Loader");
1493 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1494 MODULE_LICENSE("GPL");