]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/mips/kernel/vpe.c
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.
22 * Provides support for loading a MIPS SP program on VPE1.
23 * The SP enviroment is rather simple, no tlb's. It needs to be relocatable
24 * (or partially linked). You should initialise your stack in the startup
25 * code. This loader looks for the symbol __start and sets up
26 * execution to resume from there. The MIPS SDE kit contains suitable examples.
28 * To load and run, simply cat a SP 'program file' to /dev/vpe1.
29 * i.e cat spapp >/dev/vpe1.
31 * You'll need to have the following device files.
32 * mknod /dev/vpe0 c 63 0
33 * mknod /dev/vpe1 c 63 1
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <asm/uaccess.h>
41 #include <linux/slab.h>
42 #include <linux/list.h>
43 #include <linux/vmalloc.h>
44 #include <linux/elf.h>
45 #include <linux/seq_file.h>
46 #include <linux/syscalls.h>
47 #include <linux/moduleloader.h>
48 #include <linux/interrupt.h>
49 #include <linux/poll.h>
50 #include <linux/bootmem.h>
51 #include <asm/mipsregs.h>
52 #include <asm/mipsmtregs.h>
53 #include <asm/cacheflush.h>
54 #include <asm/atomic.h>
56 #include <asm/processor.h>
57 #include <asm/system.h>
59 typedef void *vpe_handle
;
61 // defined here because the kernel module loader doesn't have
62 // anything to do with it.
63 #define SHN_MIPS_SCOMMON 0xff03
65 #ifndef ARCH_SHF_SMALL
66 #define ARCH_SHF_SMALL 0
69 /* If this is set, the section belongs in the init part of the module */
70 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
75 static char module_name
[] = "vpe";
78 /* grab the likely amount of memory we will need. */
79 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
80 #define P_SIZE (2 * 1024 * 1024)
82 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
83 #define P_SIZE (256 * 1024)
109 /* The list of TC's with this VPE */
112 /* The global list of tc's */
113 struct list_head list
;
117 enum vpe_state state
;
119 /* (device) minor associated with this vpe */
122 /* elfloader stuff */
128 unsigned long __start
;
130 /* tc's associated with this vpe */
133 /* The list of vpe's */
134 struct list_head list
;
136 /* shared symbol address */
141 /* Virtual processing elements */
142 struct list_head vpe_list
;
144 /* Thread contexts */
145 struct list_head tc_list
;
148 static void release_progmem(void *ptr
);
149 static void dump_vpe(vpe_t
* v
);
150 extern void save_gp_address(unsigned int secbase
, unsigned int rel
);
152 /* get the vpe associated with this minor */
153 struct vpe
*get_vpe(int minor
)
157 list_for_each_entry(v
, &vpecontrol
.vpe_list
, list
) {
158 if (v
->minor
== minor
)
162 printk(KERN_DEBUG
"VPE: get_vpe minor %d not found\n", minor
);
166 /* get the vpe associated with this minor */
167 struct tc
*get_tc(int index
)
171 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
172 if (t
->index
== index
)
176 printk(KERN_DEBUG
"VPE: get_tc index %d not found\n", index
);
181 struct tc
*get_tc_unused(void)
185 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
186 if (t
->state
== TC_STATE_UNUSED
)
190 printk(KERN_DEBUG
"VPE: All TC's are in use\n");
195 /* allocate a vpe and associate it with this minor (or index) */
196 struct vpe
*alloc_vpe(int minor
)
200 if ((v
= kmalloc(sizeof(struct vpe
), GFP_KERNEL
)) == NULL
) {
201 printk(KERN_WARNING
"VPE: alloc_vpe no mem\n");
205 memset(v
, 0, sizeof(struct vpe
));
207 INIT_LIST_HEAD(&v
->tc
);
208 list_add_tail(&v
->list
, &vpecontrol
.vpe_list
);
214 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
215 struct tc
*alloc_tc(int index
)
219 if ((t
= kmalloc(sizeof(struct tc
), GFP_KERNEL
)) == NULL
) {
220 printk(KERN_WARNING
"VPE: alloc_tc no mem\n");
224 memset(t
, 0, sizeof(struct tc
));
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_mvpconf0();
252 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val
,
253 (val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
,
254 val
& MVPCONF0_PTC
, (val
& MVPCONF0_M
) >> MVPCONF0_M_SHIFT
);
256 val
= read_c0_mvpcontrol();
257 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val
,
258 (val
& MVPCONTROL_STLB
) >> MVPCONTROL_STLB_SHIFT
,
259 (val
& MVPCONTROL_VPC
) >> MVPCONTROL_VPC_SHIFT
,
260 (val
& MVPCONTROL_EVP
));
262 val
= read_c0_vpeconf0();
263 printk("VPEConf0 0x%lx MVP %ld\n", val
,
264 (val
& VPECONF0_MVP
) >> VPECONF0_MVP_SHIFT
);
267 /* Find some VPE program space */
268 static void *alloc_progmem(u32 len
)
270 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
271 /* this means you must tell linux to use less memory than you physically have */
272 return (void *)((max_pfn
* PAGE_SIZE
) + KSEG0
);
274 // simple grab some mem for now
275 return kmalloc(len
, GFP_KERNEL
);
279 static void release_progmem(void *ptr
)
281 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
286 /* Update size with this section: return offset. */
287 static long get_offset(unsigned long *size
, Elf_Shdr
* sechdr
)
291 ret
= ALIGN(*size
, sechdr
->sh_addralign
? : 1);
292 *size
= ret
+ sechdr
->sh_size
;
296 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
297 might -- code, read-only data, read-write data, small data. Tally
298 sizes, and place the offsets into sh_entsize fields: high bit means it
300 static void layout_sections(struct module
*mod
, const Elf_Ehdr
* hdr
,
301 Elf_Shdr
* sechdrs
, const char *secstrings
)
303 static unsigned long const masks
[][2] = {
304 /* NOTE: all executable code must be the first section
305 * in this array; otherwise modify the text_size
306 * finder in the two loops below */
307 {SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
308 {SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
309 {SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
310 {ARCH_SHF_SMALL
| SHF_ALLOC
, 0}
314 for (i
= 0; i
< hdr
->e_shnum
; i
++)
315 sechdrs
[i
].sh_entsize
= ~0UL;
317 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
318 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
319 Elf_Shdr
*s
= &sechdrs
[i
];
321 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
322 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
323 || (s
->sh_flags
& masks
[m
][1])
324 || s
->sh_entsize
!= ~0UL)
326 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
330 mod
->core_text_size
= mod
->core_size
;
336 /* from module-elf32.c, but subverted a little */
339 struct mips_hi16
*next
;
344 static struct mips_hi16
*mips_hi16_list
;
345 static unsigned int gp_offs
, gp_addr
;
347 static int apply_r_mips_none(struct module
*me
, uint32_t *location
,
353 static int apply_r_mips_gprel16(struct module
*me
, uint32_t *location
,
358 if( !(*location
& 0xffff) ) {
359 rel
= (int)v
- gp_addr
;
362 /* .sbss + gp(relative) + offset */
364 rel
= (int)(short)((int)v
+ gp_offs
+
365 (int)(short)(*location
& 0xffff) - gp_addr
);
368 if( (rel
> 32768) || (rel
< -32768) ) {
370 "apply_r_mips_gprel16: relative address out of range 0x%x %d\n",
375 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
380 static int apply_r_mips_pc16(struct module
*me
, uint32_t *location
,
384 rel
= (((unsigned int)v
- (unsigned int)location
));
385 rel
>>= 2; // because the offset is in _instructions_ not bytes.
386 rel
-= 1; // and one instruction less due to the branch delay slot.
388 if( (rel
> 32768) || (rel
< -32768) ) {
390 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel
);
394 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
399 static int apply_r_mips_32(struct module
*me
, uint32_t *location
,
407 static int apply_r_mips_26(struct module
*me
, uint32_t *location
,
411 printk(KERN_ERR
"module %s: dangerous relocation mod4\n", me
->name
);
415 /* Not desperately convinced this is a good check of an overflow condition
416 anyway. But it gets in the way of handling undefined weak symbols which
417 we want to set to zero.
418 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
420 "module %s: relocation overflow\n",
426 *location
= (*location
& ~0x03ffffff) |
427 ((*location
+ (v
>> 2)) & 0x03ffffff);
431 static int apply_r_mips_hi16(struct module
*me
, uint32_t *location
,
437 * We cannot relocate this one now because we don't know the value of
438 * the carry we need to add. Save the information, and let LO16 do the
441 n
= kmalloc(sizeof *n
, GFP_KERNEL
);
447 n
->next
= mips_hi16_list
;
453 static int apply_r_mips_lo16(struct module
*me
, uint32_t *location
,
456 unsigned long insnlo
= *location
;
457 Elf32_Addr val
, vallo
;
459 /* Sign extend the addend we extract from the lo insn. */
460 vallo
= ((insnlo
& 0xffff) ^ 0x8000) - 0x8000;
462 if (mips_hi16_list
!= NULL
) {
467 struct mips_hi16
*next
;
471 * The value for the HI16 had best be the same.
474 printk("%d != %d\n", v
, l
->value
);
480 * Do the HI16 relocation. Note that we actually don't
481 * need to know anything about the LO16 itself, except
482 * where to find the low 16 bits of the addend needed
486 val
= ((insn
& 0xffff) << 16) + vallo
;
490 * Account for the sign extension that will happen in
493 val
= ((val
>> 16) + ((val
& 0x8000) != 0)) & 0xffff;
495 insn
= (insn
& ~0xffff) | val
;
503 mips_hi16_list
= NULL
;
507 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
510 insnlo
= (insnlo
& ~0xffff) | (val
& 0xffff);
516 printk(KERN_ERR
"module %s: dangerous " "relocation\n", me
->name
);
521 static int (*reloc_handlers
[]) (struct module
*me
, uint32_t *location
,
523 [R_MIPS_NONE
] = apply_r_mips_none
,
524 [R_MIPS_32
] = apply_r_mips_32
,
525 [R_MIPS_26
] = apply_r_mips_26
,
526 [R_MIPS_HI16
] = apply_r_mips_hi16
,
527 [R_MIPS_LO16
] = apply_r_mips_lo16
,
528 [R_MIPS_GPREL16
] = apply_r_mips_gprel16
,
529 [R_MIPS_PC16
] = apply_r_mips_pc16
533 int apply_relocations(Elf32_Shdr
*sechdrs
,
535 unsigned int symindex
,
539 Elf32_Rel
*rel
= (void *) sechdrs
[relsec
].sh_addr
;
546 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
547 Elf32_Word r_info
= rel
[i
].r_info
;
549 /* This is where to make the change */
550 location
= (void *)sechdrs
[sechdrs
[relsec
].sh_info
].sh_addr
552 /* This is the symbol it is referring to */
553 sym
= (Elf32_Sym
*)sechdrs
[symindex
].sh_addr
554 + ELF32_R_SYM(r_info
);
556 if (!sym
->st_value
) {
557 printk(KERN_DEBUG
"%s: undefined weak symbol %s\n",
558 me
->name
, strtab
+ sym
->st_name
);
559 /* just print the warning, dont barf */
564 res
= reloc_handlers
[ELF32_R_TYPE(r_info
)](me
, location
, v
);
567 "relocation error 0x%x sym refer <%s> value 0x%x "
568 "type 0x%x r_info 0x%x\n",
569 (unsigned int)location
, strtab
+ sym
->st_name
, v
,
570 r_info
, ELF32_R_TYPE(r_info
));
580 void save_gp_address(unsigned int secbase
, unsigned int rel
)
582 gp_addr
= secbase
+ rel
;
583 gp_offs
= gp_addr
- (secbase
& 0xffff0000);
585 /* end module-elf32.c */
589 /* Change all symbols so that sh_value encodes the pointer directly. */
590 static int simplify_symbols(Elf_Shdr
* sechdrs
,
591 unsigned int symindex
,
593 const char *secstrings
,
594 unsigned int nsecs
, struct module
*mod
)
596 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
597 unsigned long secbase
, bssbase
= 0;
598 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
601 /* find the .bss section for COMMON symbols */
602 for (i
= 0; i
< nsecs
; i
++) {
603 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
, ".bss", 4) == 0)
604 bssbase
= sechdrs
[i
].sh_addr
;
607 for (i
= 1; i
< n
; i
++) {
608 switch (sym
[i
].st_shndx
) {
610 /* Allocate space for the symbol in the .bss section. 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
:
630 "simplify_symbols: ignoring SHN_MIPS_SCOMMON symbol <%s> st_shndx %d\n",
631 strtab
+ sym
[i
].st_name
, sym
[i
].st_shndx
);
637 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
639 if (strncmp(strtab
+ sym
[i
].st_name
, "_gp", 3) == 0) {
640 save_gp_address(secbase
, sym
[i
].st_value
);
643 sym
[i
].st_value
+= secbase
;
652 #ifdef DEBUG_ELFLOADER
653 static void dump_elfsymbols(Elf_Shdr
* sechdrs
, unsigned int symindex
,
654 const char *strtab
, struct module
*mod
)
656 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
657 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
659 printk(KERN_DEBUG
"dump_elfsymbols: n %d\n", n
);
660 for (i
= 1; i
< n
; i
++) {
661 printk(KERN_DEBUG
" i %d name <%s> 0x%x\n", i
,
662 strtab
+ sym
[i
].st_name
, sym
[i
].st_value
);
667 static void dump_tc(struct tc
*t
)
669 printk(KERN_WARNING
"VPE: TC index %d TCStatus 0x%lx halt 0x%lx\n",
670 t
->index
, read_tc_c0_tcstatus(), read_tc_c0_tchalt());
671 printk(KERN_WARNING
"VPE: tcrestart 0x%lx\n", read_tc_c0_tcrestart());
674 static void dump_tclist(void)
678 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
683 /* We are prepared so configure and start the VPE... */
684 int vpe_run(vpe_t
* v
)
689 /* check we are the Master VPE */
690 val
= read_c0_vpeconf0();
691 if (!(val
& VPECONF0_MVP
)) {
693 "VPE: only Master VPE's are allowed to configure MT\n");
697 /* disable MT (using dvpe) */
700 /* Put MVPE's into 'configuration state' */
701 set_c0_mvpcontrol(MVPCONTROL_VPC
);
703 if (!list_empty(&v
->tc
)) {
704 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
705 printk(KERN_WARNING
"VPE: TC %d is already in use.\n",
710 printk(KERN_WARNING
"VPE: No TC's associated with VPE %d\n",
717 val
= read_vpe_c0_vpeconf0();
719 /* should check it is halted, and not activated */
720 if ((read_tc_c0_tcstatus() & TCSTATUS_A
) || !(read_tc_c0_tchalt() & TCHALT_H
)) {
721 printk(KERN_WARNING
"VPE: TC %d is already doing something!\n",
728 /* Write the address we want it to start running from in the TCPC register. */
729 write_tc_c0_tcrestart((unsigned long)v
->__start
);
731 /* write the sivc_info address to tccontext */
732 write_tc_c0_tccontext((unsigned long)0);
734 /* Set up the XTC bit in vpeconf0 to point at our tc */
735 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (t
->index
<< VPECONF0_XTC_SHIFT
));
737 /* mark the TC as activated, not interrupt exempt and not dynamically allocatable */
738 val
= read_tc_c0_tcstatus();
739 val
= (val
& ~(TCSTATUS_DA
| TCSTATUS_IXMT
)) | TCSTATUS_A
;
740 write_tc_c0_tcstatus(val
);
742 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H
);
745 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE
); // no multiple TC's
746 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA
); // enable this VPE
749 * The sde-kit passes 'memsize' to __start in $a3, so set something
751 * Or set $a3 (register 7) to zero and define DFLT_STACK_SIZE and
752 * DFLT_HEAP_SIZE when you compile your program
757 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
758 write_vpe_c0_config(read_c0_config());
760 /* clear out any left overs from a previous program */
761 write_vpe_c0_cause(0);
763 /* take system out of configuration state */
764 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
766 /* clear interrupts enabled IE, ERL, EXL, and KSU from c0 status */
767 write_vpe_c0_status(read_vpe_c0_status() & ~(ST0_ERL
| ST0_KSU
| ST0_IE
| ST0_EXL
));
775 static unsigned long find_vpe_symbols(vpe_t
* v
, Elf_Shdr
* sechdrs
,
776 unsigned int symindex
, const char *strtab
,
779 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
780 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
782 for (i
= 1; i
< n
; i
++) {
783 if (strcmp(strtab
+ sym
[i
].st_name
, "__start") == 0) {
784 v
->__start
= sym
[i
].st_value
;
787 if (strcmp(strtab
+ sym
[i
].st_name
, "vpe_shared") == 0) {
788 v
->shared_ptr
= (void *)sym
[i
].st_value
;
795 /* Allocates a VPE with some program code space(the load address), copies the contents
796 of the program (p)buffer performing relocatations/etc, free's it when finished.
798 int vpe_elfload(vpe_t
* v
)
803 char *secstrings
, *strtab
= NULL
;
804 unsigned int len
, i
, symindex
= 0, strindex
= 0;
806 struct module mod
; // so we can re-use the relocations code
808 memset(&mod
, 0, sizeof(struct module
));
809 strcpy(mod
.name
, "VPE dummy prog module");
811 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
814 /* Sanity checks against insmoding binaries or wrong arch,
816 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
817 || hdr
->e_type
!= ET_REL
|| !elf_check_arch(hdr
)
818 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
820 "VPE program, wrong arch or weird elf version\n");
825 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
)) {
826 printk(KERN_ERR
"VPE program length %u truncated\n", len
);
830 /* Convenience variables */
831 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
832 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
833 sechdrs
[0].sh_addr
= 0;
835 /* And these should exist, but gcc whinges if we don't init them */
836 symindex
= strindex
= 0;
838 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
840 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
841 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
) {
842 printk(KERN_ERR
"VPE program length %u truncated\n",
847 /* Mark all sections sh_addr with their address in the
849 sechdrs
[i
].sh_addr
= (size_t) hdr
+ sechdrs
[i
].sh_offset
;
851 /* Internal symbols and strings. */
852 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
854 strindex
= sechdrs
[i
].sh_link
;
855 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
859 layout_sections(&mod
, hdr
, sechdrs
, secstrings
);
861 v
->load_addr
= alloc_progmem(mod
.core_size
);
862 memset(v
->load_addr
, 0, mod
.core_size
);
864 printk("VPE elf_loader: loading to %p\n", v
->load_addr
);
866 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
869 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
872 dest
= v
->load_addr
+ sechdrs
[i
].sh_entsize
;
874 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
875 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
877 /* Update sh_addr to point to copy in image. */
878 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
881 /* Fix up syms, so that st_value is a pointer to location. */
883 simplify_symbols(sechdrs
, symindex
, strtab
, secstrings
,
886 printk(KERN_WARNING
"VPE: unable to simplify symbols\n");
890 /* Now do relocations. */
891 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
892 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
893 unsigned int info
= sechdrs
[i
].sh_info
;
895 /* Not a valid relocation section? */
896 if (info
>= hdr
->e_shnum
)
899 /* Don't bother with non-allocated sections */
900 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
903 if (sechdrs
[i
].sh_type
== SHT_REL
)
905 apply_relocations(sechdrs
, strtab
, symindex
, i
, &mod
);
906 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
907 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
911 "vpe_elfload: error in relocations err %ld\n",
917 /* make sure it's physically written out */
918 flush_icache_range((unsigned long)v
->load_addr
,
919 (unsigned long)v
->load_addr
+ v
->len
);
921 if ((find_vpe_symbols(v
, sechdrs
, symindex
, strtab
, &mod
)) < 0) {
924 "VPE: program doesn't contain __start or vpe_shared symbols\n");
928 printk(" elf loaded\n");
934 static void dump_vpe(vpe_t
* v
)
938 printk(KERN_DEBUG
"VPEControl 0x%lx\n", read_vpe_c0_vpecontrol());
939 printk(KERN_DEBUG
"VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0());
941 list_for_each_entry(t
, &vpecontrol
.tc_list
, list
) {
946 /* checks for VPE is unused and gets ready to load program */
947 static int vpe_open(struct inode
*inode
, struct file
*filp
)
952 /* assume only 1 device at the mo. */
953 if ((minor
= MINOR(inode
->i_rdev
)) != 1) {
954 printk(KERN_WARNING
"VPE: only vpe1 is supported\n");
958 if ((v
= get_vpe(minor
)) == NULL
) {
959 printk(KERN_WARNING
"VPE: unable to get vpe\n");
963 if (v
->state
!= VPE_STATE_UNUSED
) {
967 printk(KERN_WARNING
"VPE: device %d already in use\n", minor
);
972 printk(KERN_WARNING
"VPE: re-initialising %d\n", minor
);
974 release_progmem(v
->load_addr
);
978 tmp
= read_tc_c0_tcstatus();
980 /* mark not allocated and not dynamically allocatable */
981 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
982 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
983 write_tc_c0_tcstatus(tmp
);
985 write_tc_c0_tchalt(TCHALT_H
);
989 // allocate it so when we get write ops we know it's expected.
990 v
->state
= VPE_STATE_INUSE
;
992 /* this of-course trashes what was there before... */
993 v
->pbuffer
= vmalloc(P_SIZE
);
1001 static int vpe_release(struct inode
*inode
, struct file
*filp
)
1007 minor
= MINOR(inode
->i_rdev
);
1008 if ((v
= get_vpe(minor
)) == NULL
)
1011 // simple case of fire and forget, so tell the VPE to run...
1013 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
1014 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) == 0) {
1015 if (vpe_elfload(v
) >= 0)
1018 printk(KERN_WARNING
"VPE: ELF load failed.\n");
1022 printk(KERN_WARNING
"VPE: only elf files are supported\n");
1026 // cleanup any temp buffers
1033 static ssize_t
vpe_write(struct file
*file
, const char __user
* buffer
,
1034 size_t count
, loff_t
* ppos
)
1040 minor
= MINOR(file
->f_dentry
->d_inode
->i_rdev
);
1041 if ((v
= get_vpe(minor
)) == NULL
)
1044 if (v
->pbuffer
== NULL
) {
1045 printk(KERN_ERR
"vpe_write: no pbuffer\n");
1049 if ((count
+ v
->len
) > v
->plen
) {
1051 "VPE Loader: elf size too big. Perhaps strip uneeded symbols\n");
1055 count
-= copy_from_user(v
->pbuffer
+ v
->len
, buffer
, count
);
1057 printk("vpe_write: copy_to_user failed\n");
1065 static struct file_operations vpe_fops
= {
1066 .owner
= THIS_MODULE
,
1068 .release
= vpe_release
,
1072 /* module wrapper entry points */
1074 vpe_handle
vpe_alloc(void)
1080 for (i
= 1; i
< MAX_VPES
; i
++) {
1081 if ((v
= get_vpe(i
)) != NULL
) {
1082 v
->state
= VPE_STATE_INUSE
;
1089 EXPORT_SYMBOL(vpe_alloc
);
1091 /* start running from here */
1092 int vpe_start(vpe_handle vpe
, unsigned long start
)
1094 struct vpe
*v
= vpe
;
1100 EXPORT_SYMBOL(vpe_start
);
1102 /* halt it for now */
1103 int vpe_stop(vpe_handle vpe
)
1105 struct vpe
*v
= vpe
;
1107 unsigned int evpe_flags
;
1109 evpe_flags
= dvpe();
1111 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) != NULL
) {
1114 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1122 EXPORT_SYMBOL(vpe_stop
);
1124 /* I've done with it thank you */
1125 int vpe_free(vpe_handle vpe
)
1127 struct vpe
*v
= vpe
;
1129 unsigned int evpe_flags
;
1131 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
1135 evpe_flags
= dvpe();
1137 /* Put MVPE's into 'configuration state' */
1138 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1141 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1143 /* mark the TC unallocated and halt'ed */
1144 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A
);
1145 write_tc_c0_tchalt(TCHALT_H
);
1147 v
->state
= VPE_STATE_UNUSED
;
1149 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1155 EXPORT_SYMBOL(vpe_free
);
1157 void *vpe_get_shared(int index
)
1161 if ((v
= get_vpe(index
)) == NULL
) {
1162 printk(KERN_WARNING
"vpe: invalid vpe index %d\n", index
);
1166 return v
->shared_ptr
;
1169 EXPORT_SYMBOL(vpe_get_shared
);
1171 static int __init
vpe_module_init(void)
1173 struct vpe
*v
= NULL
;
1178 if (!cpu_has_mipsmt
) {
1179 printk("VPE loader: not a MIPS MT capable processor\n");
1183 if ((major
= register_chrdev(VPE_MAJOR
, module_name
, &vpe_fops
) < 0)) {
1184 printk("VPE loader: unable to register character device\n");
1194 /* Put MVPE's into 'configuration state' */
1195 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1197 /* dump_mtregs(); */
1199 INIT_LIST_HEAD(&vpecontrol
.vpe_list
);
1200 INIT_LIST_HEAD(&vpecontrol
.tc_list
);
1202 val
= read_c0_mvpconf0();
1203 for (i
= 0; i
< ((val
& MVPCONF0_PTC
) + 1); i
++) {
1207 if (i
< ((val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
) + 1) {
1210 if ((v
= alloc_vpe(i
)) == NULL
) {
1211 printk(KERN_WARNING
"VPE: unable to allocate VPE\n");
1215 list_add(&t
->tc
, &v
->tc
); /* add the tc to the list of this vpe's tc's. */
1217 /* deactivate all but vpe0 */
1219 unsigned long tmp
= read_vpe_c0_vpeconf0();
1221 tmp
&= ~VPECONF0_VPA
;
1224 tmp
|= VPECONF0_MVP
;
1225 write_vpe_c0_vpeconf0(tmp
);
1228 /* disable multi-threading with TC's */
1229 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE
);
1232 write_vpe_c0_status((read_c0_status() &
1233 ~(ST0_IM
| ST0_IE
| ST0_KSU
))
1236 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
1237 write_vpe_c0_config(read_c0_config());
1243 t
->pvpe
= v
; /* set the parent vpe */
1248 /* tc 0 will of course be running.... */
1250 t
->state
= TC_STATE_RUNNING
;
1254 /* bind a TC to each VPE, May as well put all excess TC's
1256 if (i
>= (((val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
) + 1))
1257 write_tc_c0_tcbind(read_tc_c0_tcbind() |
1258 ((val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
));
1260 write_tc_c0_tcbind(read_tc_c0_tcbind() | i
);
1262 tmp
= read_tc_c0_tcstatus();
1264 /* mark not allocated and not dynamically allocatable */
1265 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
1266 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
1267 write_tc_c0_tcstatus(tmp
);
1269 write_tc_c0_tchalt(TCHALT_H
);
1273 /* release config state */
1274 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1279 static void __exit
vpe_module_exit(void)
1283 list_for_each_entry_safe(v
, n
, &vpecontrol
.vpe_list
, list
) {
1284 if (v
->state
!= VPE_STATE_UNUSED
) {
1289 unregister_chrdev(major
, module_name
);
1292 module_init(vpe_module_init
);
1293 module_exit(vpe_module_exit
);
1294 MODULE_DESCRIPTION("MIPS VPE Loader");
1295 MODULE_AUTHOR("Elizabeth Clarke, MIPS Technologies, Inc");
1296 MODULE_LICENSE("GPL");