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/kernel.h>
32 #include <linux/device.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/mips_mt.h>
53 #include <asm/processor.h>
54 #include <asm/system.h>
58 typedef void *vpe_handle
;
60 #ifndef ARCH_SHF_SMALL
61 #define ARCH_SHF_SMALL 0
64 /* If this is set, the section belongs in the init part of the module */
65 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
67 static char module_name
[] = "vpe";
69 static const int minor
= 1; /* fixed for now */
71 #ifdef CONFIG_MIPS_APSP_KSPD
72 static struct kspd_notifications kspd_events
;
73 static int kspd_events_reqd
= 0;
76 /* grab the likely amount of memory we will need. */
77 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
78 #define P_SIZE (2 * 1024 * 1024)
80 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
81 #define P_SIZE (256 * 1024)
84 extern unsigned long physical_memsize
;
87 #define VPE_PATH_MAX 256
103 enum vpe_state state
;
105 /* (device) minor associated with this vpe */
108 /* elfloader stuff */
113 unsigned int uid
, gid
;
114 char cwd
[VPE_PATH_MAX
];
116 unsigned long __start
;
118 /* tc's associated with this vpe */
121 /* The list of vpe's */
122 struct list_head list
;
124 /* shared symbol address */
127 /* the list of who wants to know when something major happens */
128 struct list_head notify
;
138 /* The list of TC's with this VPE */
141 /* The global list of tc's */
142 struct list_head list
;
146 /* Virtual processing elements */
147 struct list_head vpe_list
;
149 /* Thread contexts */
150 struct list_head tc_list
;
152 .vpe_list
= LIST_HEAD_INIT(vpecontrol
.vpe_list
),
153 .tc_list
= LIST_HEAD_INIT(vpecontrol
.tc_list
)
156 static void release_progmem(void *ptr
);
157 extern void save_gp_address(unsigned int secbase
, unsigned int rel
);
159 /* get the vpe associated with this minor */
160 struct vpe
*get_vpe(int minor
)
167 list_for_each_entry(v
, &vpecontrol
.vpe_list
, list
) {
168 if (v
->minor
== minor
)
175 /* get the vpe associated with this minor */
176 struct tc
*get_tc(int index
)
180 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
181 if (t
->index
== index
)
188 struct tc
*get_tc_unused(void)
192 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
193 if (t
->state
== TC_STATE_UNUSED
)
200 /* allocate a vpe and associate it with this minor (or index) */
201 struct vpe
*alloc_vpe(int minor
)
205 if ((v
= kzalloc(sizeof(struct vpe
), GFP_KERNEL
)) == NULL
) {
209 INIT_LIST_HEAD(&v
->tc
);
210 list_add_tail(&v
->list
, &vpecontrol
.vpe_list
);
212 INIT_LIST_HEAD(&v
->notify
);
217 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
218 struct tc
*alloc_tc(int index
)
222 if ((t
= kzalloc(sizeof(struct tc
), GFP_KERNEL
)) == NULL
) {
226 INIT_LIST_HEAD(&t
->tc
);
227 list_add_tail(&t
->list
, &vpecontrol
.tc_list
);
234 /* clean up and free everything */
235 void release_vpe(struct vpe
*v
)
243 void dump_mtregs(void)
247 val
= read_c0_config3();
248 printk("config3 0x%lx MT %ld\n", val
,
249 (val
& CONFIG3_MT
) >> CONFIG3_MT_SHIFT
);
251 val
= read_c0_mvpcontrol();
252 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val
,
253 (val
& MVPCONTROL_STLB
) >> MVPCONTROL_STLB_SHIFT
,
254 (val
& MVPCONTROL_VPC
) >> MVPCONTROL_VPC_SHIFT
,
255 (val
& MVPCONTROL_EVP
));
257 val
= read_c0_mvpconf0();
258 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val
,
259 (val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
,
260 val
& MVPCONF0_PTC
, (val
& MVPCONF0_M
) >> MVPCONF0_M_SHIFT
);
263 /* Find some VPE program space */
264 static void *alloc_progmem(unsigned long len
)
266 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
267 /* this means you must tell linux to use less memory than you physically have */
268 return pfn_to_kaddr(max_pfn
);
270 // simple grab some mem for now
271 return kmalloc(len
, GFP_KERNEL
);
275 static void release_progmem(void *ptr
)
277 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
282 /* Update size with this section: return offset. */
283 static long get_offset(unsigned long *size
, Elf_Shdr
* sechdr
)
287 ret
= ALIGN(*size
, sechdr
->sh_addralign
? : 1);
288 *size
= ret
+ sechdr
->sh_size
;
292 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
293 might -- code, read-only data, read-write data, small data. Tally
294 sizes, and place the offsets into sh_entsize fields: high bit means it
296 static void layout_sections(struct module
*mod
, const Elf_Ehdr
* hdr
,
297 Elf_Shdr
* sechdrs
, const char *secstrings
)
299 static unsigned long const masks
[][2] = {
300 /* NOTE: all executable code must be the first section
301 * in this array; otherwise modify the text_size
302 * finder in the two loops below */
303 {SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
304 {SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
305 {SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
306 {ARCH_SHF_SMALL
| SHF_ALLOC
, 0}
310 for (i
= 0; i
< hdr
->e_shnum
; i
++)
311 sechdrs
[i
].sh_entsize
= ~0UL;
313 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
314 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
315 Elf_Shdr
*s
= &sechdrs
[i
];
317 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
318 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
319 || (s
->sh_flags
& masks
[m
][1])
320 || s
->sh_entsize
!= ~0UL)
322 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
326 mod
->core_text_size
= mod
->core_size
;
332 /* from module-elf32.c, but subverted a little */
335 struct mips_hi16
*next
;
340 static struct mips_hi16
*mips_hi16_list
;
341 static unsigned int gp_offs
, gp_addr
;
343 static int apply_r_mips_none(struct module
*me
, uint32_t *location
,
349 static int apply_r_mips_gprel16(struct module
*me
, uint32_t *location
,
354 if( !(*location
& 0xffff) ) {
355 rel
= (int)v
- gp_addr
;
358 /* .sbss + gp(relative) + offset */
360 rel
= (int)(short)((int)v
+ gp_offs
+
361 (int)(short)(*location
& 0xffff) - gp_addr
);
364 if( (rel
> 32768) || (rel
< -32768) ) {
365 printk(KERN_DEBUG
"VPE loader: apply_r_mips_gprel16: "
366 "relative address 0x%x out of range of gp register\n",
371 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
376 static int apply_r_mips_pc16(struct module
*me
, uint32_t *location
,
380 rel
= (((unsigned int)v
- (unsigned int)location
));
381 rel
>>= 2; // because the offset is in _instructions_ not bytes.
382 rel
-= 1; // and one instruction less due to the branch delay slot.
384 if( (rel
> 32768) || (rel
< -32768) ) {
385 printk(KERN_DEBUG
"VPE loader: "
386 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel
);
390 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
395 static int apply_r_mips_32(struct module
*me
, uint32_t *location
,
403 static int apply_r_mips_26(struct module
*me
, uint32_t *location
,
407 printk(KERN_DEBUG
"VPE loader: apply_r_mips_26 "
408 " unaligned relocation\n");
413 * Not desperately convinced this is a good check of an overflow condition
414 * anyway. But it gets in the way of handling undefined weak symbols which
415 * we want to set to zero.
416 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
418 * "module %s: relocation overflow\n",
424 *location
= (*location
& ~0x03ffffff) |
425 ((*location
+ (v
>> 2)) & 0x03ffffff);
429 static int apply_r_mips_hi16(struct module
*me
, uint32_t *location
,
435 * We cannot relocate this one now because we don't know the value of
436 * the carry we need to add. Save the information, and let LO16 do the
439 n
= kmalloc(sizeof *n
, GFP_KERNEL
);
445 n
->next
= mips_hi16_list
;
451 static int apply_r_mips_lo16(struct module
*me
, uint32_t *location
,
454 unsigned long insnlo
= *location
;
455 Elf32_Addr val
, vallo
;
457 /* Sign extend the addend we extract from the lo insn. */
458 vallo
= ((insnlo
& 0xffff) ^ 0x8000) - 0x8000;
460 if (mips_hi16_list
!= NULL
) {
465 struct mips_hi16
*next
;
469 * The value for the HI16 had best be the same.
472 printk(KERN_DEBUG
"VPE loader: "
473 "apply_r_mips_lo16/hi16: "
474 "inconsistent value information\n");
479 * Do the HI16 relocation. Note that we actually don't
480 * need to know anything about the LO16 itself, except
481 * where to find the low 16 bits of the addend needed
485 val
= ((insn
& 0xffff) << 16) + vallo
;
489 * Account for the sign extension that will happen in
492 val
= ((val
>> 16) + ((val
& 0x8000) != 0)) & 0xffff;
494 insn
= (insn
& ~0xffff) | val
;
502 mips_hi16_list
= NULL
;
506 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
509 insnlo
= (insnlo
& ~0xffff) | (val
& 0xffff);
515 static int (*reloc_handlers
[]) (struct module
*me
, uint32_t *location
,
517 [R_MIPS_NONE
] = apply_r_mips_none
,
518 [R_MIPS_32
] = apply_r_mips_32
,
519 [R_MIPS_26
] = apply_r_mips_26
,
520 [R_MIPS_HI16
] = apply_r_mips_hi16
,
521 [R_MIPS_LO16
] = apply_r_mips_lo16
,
522 [R_MIPS_GPREL16
] = apply_r_mips_gprel16
,
523 [R_MIPS_PC16
] = apply_r_mips_pc16
526 static char *rstrs
[] = {
527 [R_MIPS_NONE
] = "MIPS_NONE",
528 [R_MIPS_32
] = "MIPS_32",
529 [R_MIPS_26
] = "MIPS_26",
530 [R_MIPS_HI16
] = "MIPS_HI16",
531 [R_MIPS_LO16
] = "MIPS_LO16",
532 [R_MIPS_GPREL16
] = "MIPS_GPREL16",
533 [R_MIPS_PC16
] = "MIPS_PC16"
536 int apply_relocations(Elf32_Shdr
*sechdrs
,
538 unsigned int symindex
,
542 Elf32_Rel
*rel
= (void *) sechdrs
[relsec
].sh_addr
;
549 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
550 Elf32_Word r_info
= rel
[i
].r_info
;
552 /* This is where to make the change */
553 location
= (void *)sechdrs
[sechdrs
[relsec
].sh_info
].sh_addr
555 /* This is the symbol it is referring to */
556 sym
= (Elf32_Sym
*)sechdrs
[symindex
].sh_addr
557 + ELF32_R_SYM(r_info
);
559 if (!sym
->st_value
) {
560 printk(KERN_DEBUG
"%s: undefined weak symbol %s\n",
561 me
->name
, strtab
+ sym
->st_name
);
562 /* just print the warning, dont barf */
567 res
= reloc_handlers
[ELF32_R_TYPE(r_info
)](me
, location
, v
);
569 char *r
= rstrs
[ELF32_R_TYPE(r_info
)];
570 printk(KERN_WARNING
"VPE loader: .text+0x%x "
571 "relocation type %s for symbol \"%s\" failed\n",
572 rel
[i
].r_offset
, r
? r
: "UNKNOWN",
573 strtab
+ sym
->st_name
);
581 void save_gp_address(unsigned int secbase
, unsigned int rel
)
583 gp_addr
= secbase
+ rel
;
584 gp_offs
= gp_addr
- (secbase
& 0xffff0000);
586 /* end module-elf32.c */
590 /* Change all symbols so that sh_value encodes the pointer directly. */
591 static void simplify_symbols(Elf_Shdr
* sechdrs
,
592 unsigned int symindex
,
594 const char *secstrings
,
595 unsigned int nsecs
, struct module
*mod
)
597 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
598 unsigned long secbase
, bssbase
= 0;
599 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
602 /* find the .bss section for COMMON symbols */
603 for (i
= 0; i
< nsecs
; i
++) {
604 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) == 0) {
605 bssbase
= sechdrs
[i
].sh_addr
;
610 for (i
= 1; i
< n
; i
++) {
611 switch (sym
[i
].st_shndx
) {
613 /* Allocate space for the symbol in the .bss section.
614 st_value is currently size.
615 We want it to have the address of the symbol. */
617 size
= sym
[i
].st_value
;
618 sym
[i
].st_value
= bssbase
;
624 /* Don't need to do anything */
631 case SHN_MIPS_SCOMMON
:
632 printk(KERN_DEBUG
"simplify_symbols: ignoring SHN_MIPS_SCOMMON"
633 "symbol <%s> st_shndx %d\n", strtab
+ sym
[i
].st_name
,
639 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
641 if (strncmp(strtab
+ sym
[i
].st_name
, "_gp", 3) == 0) {
642 save_gp_address(secbase
, sym
[i
].st_value
);
645 sym
[i
].st_value
+= secbase
;
651 #ifdef DEBUG_ELFLOADER
652 static void dump_elfsymbols(Elf_Shdr
* sechdrs
, unsigned int symindex
,
653 const char *strtab
, struct module
*mod
)
655 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
656 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
658 printk(KERN_DEBUG
"dump_elfsymbols: n %d\n", n
);
659 for (i
= 1; i
< n
; i
++) {
660 printk(KERN_DEBUG
" i %d name <%s> 0x%x\n", i
,
661 strtab
+ sym
[i
].st_name
, sym
[i
].st_value
);
666 static void dump_tc(struct tc
*t
)
671 printk(KERN_DEBUG
"VPE loader: TC index %d targtc %ld "
672 "TCStatus 0x%lx halt 0x%lx\n",
673 t
->index
, read_c0_vpecontrol() & VPECONTROL_TARGTC
,
674 read_tc_c0_tcstatus(), read_tc_c0_tchalt());
676 printk(KERN_DEBUG
" tcrestart 0x%lx\n", read_tc_c0_tcrestart());
677 printk(KERN_DEBUG
" tcbind 0x%lx\n", read_tc_c0_tcbind());
679 val
= read_c0_vpeconf0();
680 printk(KERN_DEBUG
" VPEConf0 0x%lx MVP %ld\n", val
,
681 (val
& VPECONF0_MVP
) >> VPECONF0_MVP_SHIFT
);
683 printk(KERN_DEBUG
" c0 status 0x%lx\n", read_vpe_c0_status());
684 printk(KERN_DEBUG
" c0 cause 0x%lx\n", read_vpe_c0_cause());
686 printk(KERN_DEBUG
" c0 badvaddr 0x%lx\n", read_vpe_c0_badvaddr());
687 printk(KERN_DEBUG
" c0 epc 0x%lx\n", read_vpe_c0_epc());
690 static void dump_tclist(void)
694 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
699 /* We are prepared so configure and start the VPE... */
700 static int vpe_run(struct vpe
* v
)
702 struct vpe_notifications
*n
;
703 unsigned long val
, dmt_flag
;
706 /* check we are the Master VPE */
707 val
= read_c0_vpeconf0();
708 if (!(val
& VPECONF0_MVP
)) {
710 "VPE loader: only Master VPE's are allowed to configure MT\n");
714 /* disable MT (using dvpe) */
717 if (!list_empty(&v
->tc
)) {
718 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
719 printk(KERN_WARNING
"VPE loader: TC %d is already in use.\n",
724 printk(KERN_WARNING
"VPE loader: No TC's associated with VPE %d\n",
729 /* Put MVPE's into 'configuration state' */
730 set_c0_mvpcontrol(MVPCONTROL_VPC
);
734 /* should check it is halted, and not activated */
735 if ((read_tc_c0_tcstatus() & TCSTATUS_A
) || !(read_tc_c0_tchalt() & TCHALT_H
)) {
736 printk(KERN_WARNING
"VPE loader: TC %d is already doing something!\n",
743 * Disable multi-threaded execution whilst we activate, clear the
744 * halt bit and bound the tc to the other VPE...
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);
752 * Mark the TC as activated, not interrupt exempt and not dynamically
755 val
= read_tc_c0_tcstatus();
756 val
= (val
& ~(TCSTATUS_DA
| TCSTATUS_IXMT
)) | TCSTATUS_A
;
757 write_tc_c0_tcstatus(val
);
759 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H
);
762 * The sde-kit passes 'memsize' to __start in $a3, so set something
763 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
764 * DFLT_HEAP_SIZE when you compile your program
766 mttgpr(7, physical_memsize
);
771 * bind the TC to VPE 1 as late as possible so we only have the final
772 * VPE registers to set up, and so an EJTAG probe can trigger on it
774 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE
) | v
->minor
);
776 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA
));
778 back_to_back_c0_hazard();
780 /* Set up the XTC bit in vpeconf0 to point at our tc */
781 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC
))
782 | (t
->index
<< VPECONF0_XTC_SHIFT
));
784 back_to_back_c0_hazard();
786 /* enable this VPE */
787 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA
);
789 /* clear out any left overs from a previous program */
790 write_vpe_c0_status(0);
791 write_vpe_c0_cause(0);
793 /* take system out of configuration state */
794 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
796 /* now safe to re-enable multi-threading */
802 list_for_each_entry(n
, &v
->notify
, list
) {
809 static int find_vpe_symbols(struct vpe
* v
, Elf_Shdr
* sechdrs
,
810 unsigned int symindex
, const char *strtab
,
813 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
814 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
816 for (i
= 1; i
< n
; i
++) {
817 if (strcmp(strtab
+ sym
[i
].st_name
, "__start") == 0) {
818 v
->__start
= sym
[i
].st_value
;
821 if (strcmp(strtab
+ sym
[i
].st_name
, "vpe_shared") == 0) {
822 v
->shared_ptr
= (void *)sym
[i
].st_value
;
826 if ( (v
->__start
== 0) || (v
->shared_ptr
== NULL
))
833 * Allocates a VPE with some program code space(the load address), copies the
834 * contents of the program (p)buffer performing relocatations/etc, free's it
837 static int vpe_elfload(struct vpe
* v
)
842 char *secstrings
, *strtab
= NULL
;
843 unsigned int len
, i
, symindex
= 0, strindex
= 0, relocate
= 0;
844 struct module mod
; // so we can re-use the relocations code
846 memset(&mod
, 0, sizeof(struct module
));
847 strcpy(mod
.name
, "VPE loader");
849 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
852 /* Sanity checks against insmoding binaries or wrong arch,
854 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
855 || (hdr
->e_type
!= ET_REL
&& hdr
->e_type
!= ET_EXEC
)
856 || !elf_check_arch(hdr
)
857 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
859 "VPE loader: program wrong arch or weird elf version\n");
864 if (hdr
->e_type
== ET_REL
)
867 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
)) {
868 printk(KERN_ERR
"VPE loader: program length %u truncated\n",
874 /* Convenience variables */
875 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
876 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
877 sechdrs
[0].sh_addr
= 0;
879 /* And these should exist, but gcc whinges if we don't init them */
880 symindex
= strindex
= 0;
883 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
884 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
885 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
) {
886 printk(KERN_ERR
"VPE program length %u truncated\n",
891 /* Mark all sections sh_addr with their address in the
893 sechdrs
[i
].sh_addr
= (size_t) hdr
+ sechdrs
[i
].sh_offset
;
895 /* Internal symbols and strings. */
896 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
898 strindex
= sechdrs
[i
].sh_link
;
899 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
902 layout_sections(&mod
, hdr
, sechdrs
, secstrings
);
905 v
->load_addr
= alloc_progmem(mod
.core_size
);
906 memset(v
->load_addr
, 0, mod
.core_size
);
908 printk("VPE loader: loading to %p\n", v
->load_addr
);
911 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
914 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
917 dest
= v
->load_addr
+ sechdrs
[i
].sh_entsize
;
919 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
920 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
922 /* Update sh_addr to point to copy in image. */
923 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
925 printk(KERN_DEBUG
" section sh_name %s sh_addr 0x%x\n",
926 secstrings
+ sechdrs
[i
].sh_name
, sechdrs
[i
].sh_addr
);
929 /* Fix up syms, so that st_value is a pointer to location. */
930 simplify_symbols(sechdrs
, symindex
, strtab
, secstrings
,
933 /* Now do relocations. */
934 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
935 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
936 unsigned int info
= sechdrs
[i
].sh_info
;
938 /* Not a valid relocation section? */
939 if (info
>= hdr
->e_shnum
)
942 /* Don't bother with non-allocated sections */
943 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
946 if (sechdrs
[i
].sh_type
== SHT_REL
)
947 err
= apply_relocations(sechdrs
, strtab
, symindex
, i
,
949 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
950 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
957 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
959 /* Internal symbols and strings. */
960 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
962 strindex
= sechdrs
[i
].sh_link
;
963 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
965 /* mark the symtab's address for when we try to find the
967 sechdrs
[i
].sh_addr
= (size_t) hdr
+ sechdrs
[i
].sh_offset
;
970 /* filter sections we dont want in the final image */
971 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
) ||
972 (sechdrs
[i
].sh_type
== SHT_MIPS_REGINFO
)) {
973 printk( KERN_DEBUG
" ignoring section, "
974 "name %s type %x address 0x%x \n",
975 secstrings
+ sechdrs
[i
].sh_name
,
976 sechdrs
[i
].sh_type
, sechdrs
[i
].sh_addr
);
980 if (sechdrs
[i
].sh_addr
< (unsigned int)v
->load_addr
) {
981 printk( KERN_WARNING
"VPE loader: "
982 "fully linked image has invalid section, "
983 "name %s type %x address 0x%x, before load "
985 secstrings
+ sechdrs
[i
].sh_name
,
986 sechdrs
[i
].sh_type
, sechdrs
[i
].sh_addr
,
987 (unsigned int)v
->load_addr
);
991 printk(KERN_DEBUG
" copying section sh_name %s, sh_addr 0x%x "
992 "size 0x%x0 from x%p\n",
993 secstrings
+ sechdrs
[i
].sh_name
, sechdrs
[i
].sh_addr
,
994 sechdrs
[i
].sh_size
, hdr
+ sechdrs
[i
].sh_offset
);
996 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
997 memcpy((void *)sechdrs
[i
].sh_addr
,
998 (char *)hdr
+ sechdrs
[i
].sh_offset
,
1001 memset((void *)sechdrs
[i
].sh_addr
, 0, sechdrs
[i
].sh_size
);
1005 /* make sure it's physically written out */
1006 flush_icache_range((unsigned long)v
->load_addr
,
1007 (unsigned long)v
->load_addr
+ v
->len
);
1009 if ((find_vpe_symbols(v
, sechdrs
, symindex
, strtab
, &mod
)) < 0) {
1010 if (v
->__start
== 0) {
1011 printk(KERN_WARNING
"VPE loader: program does not contain "
1012 "a __start symbol\n");
1016 if (v
->shared_ptr
== NULL
)
1017 printk(KERN_WARNING
"VPE loader: "
1018 "program does not contain vpe_shared symbol.\n"
1019 " Unable to use AMVP (AP/SP) facilities.\n");
1022 printk(" elf loaded\n");
1026 void __used
dump_vpe(struct vpe
* v
)
1032 printk(KERN_DEBUG
"VPEControl 0x%lx\n", read_vpe_c0_vpecontrol());
1033 printk(KERN_DEBUG
"VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0());
1035 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
)
1039 static void cleanup_tc(struct tc
*tc
)
1043 /* Put MVPE's into 'configuration state' */
1044 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1047 tmp
= read_tc_c0_tcstatus();
1049 /* mark not allocated and not dynamically allocatable */
1050 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
1051 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
1052 write_tc_c0_tcstatus(tmp
);
1054 write_tc_c0_tchalt(TCHALT_H
);
1056 /* bind it to anything other than VPE1 */
1057 write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE
); // | TCBIND_CURVPE
1059 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1062 static int getcwd(char *buff
, int size
)
1064 mm_segment_t old_fs
;
1070 ret
= sys_getcwd(buff
,size
);
1077 /* checks VPE is unused and gets ready to load program */
1078 static int vpe_open(struct inode
*inode
, struct file
*filp
)
1081 enum vpe_state state
;
1083 struct vpe_notifications
*not;
1085 /* assume only 1 device at the mo. */
1086 if ((minor
= iminor(inode
)) != 1) {
1087 printk(KERN_WARNING
"VPE loader: only vpe1 is supported\n");
1091 if ((v
= get_vpe(minor
)) == NULL
) {
1092 printk(KERN_WARNING
"VPE loader: unable to get vpe\n");
1096 state
= xchg(&v
->state
, VPE_STATE_INUSE
);
1097 if (state
!= VPE_STATE_UNUSED
) {
1100 printk(KERN_DEBUG
"VPE loader: tc in use dumping regs\n");
1102 dump_tc(get_tc(minor
));
1104 list_for_each_entry(not, &v
->notify
, list
) {
1108 release_progmem(v
->load_addr
);
1109 cleanup_tc(get_tc(minor
));
1112 /* this of-course trashes what was there before... */
1113 v
->pbuffer
= vmalloc(P_SIZE
);
1115 v
->load_addr
= NULL
;
1118 v
->uid
= filp
->f_uid
;
1119 v
->gid
= filp
->f_gid
;
1121 #ifdef CONFIG_MIPS_APSP_KSPD
1122 /* get kspd to tell us when a syscall_exit happens */
1123 if (!kspd_events_reqd
) {
1124 kspd_notify(&kspd_events
);
1130 ret
= getcwd(v
->cwd
, VPE_PATH_MAX
);
1132 printk(KERN_WARNING
"VPE loader: open, getcwd returned %d\n", ret
);
1134 v
->shared_ptr
= NULL
;
1139 static int vpe_release(struct inode
*inode
, struct file
*filp
)
1145 minor
= iminor(inode
);
1146 if ((v
= get_vpe(minor
)) == NULL
)
1149 // simple case of fire and forget, so tell the VPE to run...
1151 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
1152 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) == 0) {
1153 if (vpe_elfload(v
) >= 0)
1156 printk(KERN_WARNING
"VPE loader: ELF load failed.\n");
1160 printk(KERN_WARNING
"VPE loader: only elf files are supported\n");
1164 /* It's good to be able to run the SP and if it chokes have a look at
1165 the /dev/rt?. But if we reset the pointer to the shared struct we
1166 loose what has happened. So perhaps if garbage is sent to the vpe
1167 device, use it as a trigger for the reset. Hopefully a nice
1168 executable will be along shortly. */
1170 v
->shared_ptr
= NULL
;
1172 // cleanup any temp buffers
1179 static ssize_t
vpe_write(struct file
*file
, const char __user
* buffer
,
1180 size_t count
, loff_t
* ppos
)
1186 minor
= iminor(file
->f_path
.dentry
->d_inode
);
1187 if ((v
= get_vpe(minor
)) == NULL
)
1190 if (v
->pbuffer
== NULL
) {
1191 printk(KERN_ERR
"VPE loader: no buffer for program\n");
1195 if ((count
+ v
->len
) > v
->plen
) {
1197 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1201 count
-= copy_from_user(v
->pbuffer
+ v
->len
, buffer
, count
);
1209 static const struct file_operations vpe_fops
= {
1210 .owner
= THIS_MODULE
,
1212 .release
= vpe_release
,
1216 /* module wrapper entry points */
1218 vpe_handle
vpe_alloc(void)
1224 for (i
= 1; i
< MAX_VPES
; i
++) {
1225 if ((v
= get_vpe(i
)) != NULL
) {
1226 v
->state
= VPE_STATE_INUSE
;
1233 EXPORT_SYMBOL(vpe_alloc
);
1235 /* start running from here */
1236 int vpe_start(vpe_handle vpe
, unsigned long start
)
1238 struct vpe
*v
= vpe
;
1244 EXPORT_SYMBOL(vpe_start
);
1246 /* halt it for now */
1247 int vpe_stop(vpe_handle vpe
)
1249 struct vpe
*v
= vpe
;
1251 unsigned int evpe_flags
;
1253 evpe_flags
= dvpe();
1255 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) != NULL
) {
1258 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1266 EXPORT_SYMBOL(vpe_stop
);
1268 /* I've done with it thank you */
1269 int vpe_free(vpe_handle vpe
)
1271 struct vpe
*v
= vpe
;
1273 unsigned int evpe_flags
;
1275 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
1279 evpe_flags
= dvpe();
1281 /* Put MVPE's into 'configuration state' */
1282 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1285 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1287 /* mark the TC unallocated and halt'ed */
1288 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A
);
1289 write_tc_c0_tchalt(TCHALT_H
);
1291 v
->state
= VPE_STATE_UNUSED
;
1293 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1299 EXPORT_SYMBOL(vpe_free
);
1301 void *vpe_get_shared(int index
)
1305 if ((v
= get_vpe(index
)) == NULL
)
1308 return v
->shared_ptr
;
1311 EXPORT_SYMBOL(vpe_get_shared
);
1313 int vpe_getuid(int index
)
1317 if ((v
= get_vpe(index
)) == NULL
)
1323 EXPORT_SYMBOL(vpe_getuid
);
1325 int vpe_getgid(int index
)
1329 if ((v
= get_vpe(index
)) == NULL
)
1335 EXPORT_SYMBOL(vpe_getgid
);
1337 int vpe_notify(int index
, struct vpe_notifications
*notify
)
1341 if ((v
= get_vpe(index
)) == NULL
)
1344 list_add(¬ify
->list
, &v
->notify
);
1348 EXPORT_SYMBOL(vpe_notify
);
1350 char *vpe_getcwd(int index
)
1354 if ((v
= get_vpe(index
)) == NULL
)
1360 EXPORT_SYMBOL(vpe_getcwd
);
1362 #ifdef CONFIG_MIPS_APSP_KSPD
1363 static void kspd_sp_exit( int sp_id
)
1365 cleanup_tc(get_tc(sp_id
));
1369 static struct device
*vpe_dev
;
1371 static int __init
vpe_module_init(void)
1373 struct vpe
*v
= NULL
;
1379 if (!cpu_has_mipsmt
) {
1380 printk("VPE loader: not a MIPS MT capable processor\n");
1384 major
= register_chrdev(0, module_name
, &vpe_fops
);
1386 printk("VPE loader: unable to register character device\n");
1390 dev
= device_create(mt_class
, NULL
, MKDEV(major
, minor
),
1401 /* Put MVPE's into 'configuration state' */
1402 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1404 /* dump_mtregs(); */
1407 val
= read_c0_mvpconf0();
1408 for (i
= 0; i
< ((val
& MVPCONF0_PTC
) + 1); i
++) {
1412 if (i
< ((val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
) + 1) {
1415 if ((v
= alloc_vpe(i
)) == NULL
) {
1416 printk(KERN_WARNING
"VPE: unable to allocate VPE\n");
1420 /* add the tc to the list of this vpe's tc's. */
1421 list_add(&t
->tc
, &v
->tc
);
1423 /* deactivate all but vpe0 */
1425 unsigned long tmp
= read_vpe_c0_vpeconf0();
1427 tmp
&= ~VPECONF0_VPA
;
1430 tmp
|= VPECONF0_MVP
;
1431 write_vpe_c0_vpeconf0(tmp
);
1434 /* disable multi-threading with TC's */
1435 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE
);
1439 * Set config to be the same as vpe0,
1440 * particularly kseg0 coherency alg
1442 write_vpe_c0_config(read_c0_config());
1447 t
->pvpe
= v
; /* set the parent vpe */
1454 /* Any TC that is bound to VPE0 gets left as is - in case
1455 we are running SMTC on VPE0. A TC that is bound to any
1456 other VPE gets bound to VPE0, ideally I'd like to make
1457 it homeless but it doesn't appear to let me bind a TC
1458 to a non-existent VPE. Which is perfectly reasonable.
1460 The (un)bound state is visible to an EJTAG probe so may
1464 if (((tmp
= read_tc_c0_tcbind()) & TCBIND_CURVPE
)) {
1465 /* tc is bound >vpe0 */
1466 write_tc_c0_tcbind(tmp
& ~TCBIND_CURVPE
);
1468 t
->pvpe
= get_vpe(0); /* set the parent vpe */
1471 tmp
= read_tc_c0_tcstatus();
1473 /* mark not activated and not dynamically allocatable */
1474 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
1475 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
1476 write_tc_c0_tcstatus(tmp
);
1478 write_tc_c0_tchalt(TCHALT_H
);
1482 /* release config state */
1483 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1485 #ifdef CONFIG_MIPS_APSP_KSPD
1486 kspd_events
.kspd_sp_exit
= kspd_sp_exit
;
1491 unregister_chrdev(major
, module_name
);
1496 static void __exit
vpe_module_exit(void)
1500 list_for_each_entry_safe(v
, n
, &vpecontrol
.vpe_list
, list
) {
1501 if (v
->state
!= VPE_STATE_UNUSED
) {
1506 device_destroy(mt_class
, MKDEV(major
, minor
));
1507 unregister_chrdev(major
, module_name
);
1510 module_init(vpe_module_init
);
1511 module_exit(vpe_module_exit
);
1512 MODULE_DESCRIPTION("MIPS VPE Loader");
1513 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1514 MODULE_LICENSE("GPL");