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.
30 #include <linux/kernel.h>
31 #include <linux/device.h>
32 #include <linux/module.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>
51 #include <asm/mips_mt.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))
67 * The number of TCs and VPEs physically available on the core
69 static int hw_tcs
, hw_vpes
;
70 static char module_name
[] = "vpe";
72 static const int minor
= 1; /* fixed for now */
74 #ifdef CONFIG_MIPS_APSP_KSPD
75 static struct kspd_notifications kspd_events
;
76 static int kspd_events_reqd
= 0;
79 /* grab the likely amount of memory we will need. */
80 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
81 #define P_SIZE (2 * 1024 * 1024)
83 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
84 #define P_SIZE (256 * 1024)
87 extern unsigned long physical_memsize
;
90 #define VPE_PATH_MAX 256
106 enum vpe_state state
;
108 /* (device) minor associated with this vpe */
111 /* elfloader stuff */
116 unsigned int uid
, gid
;
117 char cwd
[VPE_PATH_MAX
];
119 unsigned long __start
;
121 /* tc's associated with this vpe */
124 /* The list of vpe's */
125 struct list_head list
;
127 /* shared symbol address */
130 /* the list of who wants to know when something major happens */
131 struct list_head notify
;
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 */
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 ((tc
= kzalloc(sizeof(struct tc
), GFP_KERNEL
)) == NULL
)
225 INIT_LIST_HEAD(&tc
->tc
);
227 list_add_tail(&tc
->list
, &vpecontrol
.tc_list
);
233 /* clean up and free everything */
234 void release_vpe(struct vpe
*v
)
242 void dump_mtregs(void)
246 val
= read_c0_config3();
247 printk("config3 0x%lx MT %ld\n", val
,
248 (val
& CONFIG3_MT
) >> CONFIG3_MT_SHIFT
);
250 val
= read_c0_mvpcontrol();
251 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val
,
252 (val
& MVPCONTROL_STLB
) >> MVPCONTROL_STLB_SHIFT
,
253 (val
& MVPCONTROL_VPC
) >> MVPCONTROL_VPC_SHIFT
,
254 (val
& MVPCONTROL_EVP
));
256 val
= read_c0_mvpconf0();
257 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val
,
258 (val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
,
259 val
& MVPCONF0_PTC
, (val
& MVPCONF0_M
) >> MVPCONF0_M_SHIFT
);
262 /* Find some VPE program space */
263 static void *alloc_progmem(unsigned long len
)
265 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
266 /* this means you must tell linux to use less memory than you physically have */
267 return pfn_to_kaddr(max_pfn
);
269 // simple grab some mem for now
270 return kmalloc(len
, GFP_KERNEL
);
274 static void release_progmem(void *ptr
)
276 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
281 /* Update size with this section: return offset. */
282 static long get_offset(unsigned long *size
, Elf_Shdr
* sechdr
)
286 ret
= ALIGN(*size
, sechdr
->sh_addralign
? : 1);
287 *size
= ret
+ sechdr
->sh_size
;
291 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
292 might -- code, read-only data, read-write data, small data. Tally
293 sizes, and place the offsets into sh_entsize fields: high bit means it
295 static void layout_sections(struct module
*mod
, const Elf_Ehdr
* hdr
,
296 Elf_Shdr
* sechdrs
, const char *secstrings
)
298 static unsigned long const masks
[][2] = {
299 /* NOTE: all executable code must be the first section
300 * in this array; otherwise modify the text_size
301 * finder in the two loops below */
302 {SHF_EXECINSTR
| SHF_ALLOC
, ARCH_SHF_SMALL
},
303 {SHF_ALLOC
, SHF_WRITE
| ARCH_SHF_SMALL
},
304 {SHF_WRITE
| SHF_ALLOC
, ARCH_SHF_SMALL
},
305 {ARCH_SHF_SMALL
| SHF_ALLOC
, 0}
309 for (i
= 0; i
< hdr
->e_shnum
; i
++)
310 sechdrs
[i
].sh_entsize
= ~0UL;
312 for (m
= 0; m
< ARRAY_SIZE(masks
); ++m
) {
313 for (i
= 0; i
< hdr
->e_shnum
; ++i
) {
314 Elf_Shdr
*s
= &sechdrs
[i
];
316 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
317 if ((s
->sh_flags
& masks
[m
][0]) != masks
[m
][0]
318 || (s
->sh_flags
& masks
[m
][1])
319 || s
->sh_entsize
!= ~0UL)
321 s
->sh_entsize
= get_offset(&mod
->core_size
, s
);
325 mod
->core_text_size
= mod
->core_size
;
331 /* from module-elf32.c, but subverted a little */
334 struct mips_hi16
*next
;
339 static struct mips_hi16
*mips_hi16_list
;
340 static unsigned int gp_offs
, gp_addr
;
342 static int apply_r_mips_none(struct module
*me
, uint32_t *location
,
348 static int apply_r_mips_gprel16(struct module
*me
, uint32_t *location
,
353 if( !(*location
& 0xffff) ) {
354 rel
= (int)v
- gp_addr
;
357 /* .sbss + gp(relative) + offset */
359 rel
= (int)(short)((int)v
+ gp_offs
+
360 (int)(short)(*location
& 0xffff) - gp_addr
);
363 if( (rel
> 32768) || (rel
< -32768) ) {
364 printk(KERN_DEBUG
"VPE loader: apply_r_mips_gprel16: "
365 "relative address 0x%x out of range of gp register\n",
370 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
375 static int apply_r_mips_pc16(struct module
*me
, uint32_t *location
,
379 rel
= (((unsigned int)v
- (unsigned int)location
));
380 rel
>>= 2; // because the offset is in _instructions_ not bytes.
381 rel
-= 1; // and one instruction less due to the branch delay slot.
383 if( (rel
> 32768) || (rel
< -32768) ) {
384 printk(KERN_DEBUG
"VPE loader: "
385 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel
);
389 *location
= (*location
& 0xffff0000) | (rel
& 0xffff);
394 static int apply_r_mips_32(struct module
*me
, uint32_t *location
,
402 static int apply_r_mips_26(struct module
*me
, uint32_t *location
,
406 printk(KERN_DEBUG
"VPE loader: apply_r_mips_26 "
407 " unaligned relocation\n");
412 * Not desperately convinced this is a good check of an overflow condition
413 * anyway. But it gets in the way of handling undefined weak symbols which
414 * we want to set to zero.
415 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
417 * "module %s: relocation overflow\n",
423 *location
= (*location
& ~0x03ffffff) |
424 ((*location
+ (v
>> 2)) & 0x03ffffff);
428 static int apply_r_mips_hi16(struct module
*me
, uint32_t *location
,
434 * We cannot relocate this one now because we don't know the value of
435 * the carry we need to add. Save the information, and let LO16 do the
438 n
= kmalloc(sizeof *n
, GFP_KERNEL
);
444 n
->next
= mips_hi16_list
;
450 static int apply_r_mips_lo16(struct module
*me
, uint32_t *location
,
453 unsigned long insnlo
= *location
;
454 Elf32_Addr val
, vallo
;
456 /* Sign extend the addend we extract from the lo insn. */
457 vallo
= ((insnlo
& 0xffff) ^ 0x8000) - 0x8000;
459 if (mips_hi16_list
!= NULL
) {
464 struct mips_hi16
*next
;
468 * The value for the HI16 had best be the same.
471 printk(KERN_DEBUG
"VPE loader: "
472 "apply_r_mips_lo16/hi16: \t"
473 "inconsistent value information\n");
478 * Do the HI16 relocation. Note that we actually don't
479 * need to know anything about the LO16 itself, except
480 * where to find the low 16 bits of the addend needed
484 val
= ((insn
& 0xffff) << 16) + vallo
;
488 * Account for the sign extension that will happen in
491 val
= ((val
>> 16) + ((val
& 0x8000) != 0)) & 0xffff;
493 insn
= (insn
& ~0xffff) | val
;
501 mips_hi16_list
= NULL
;
505 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
508 insnlo
= (insnlo
& ~0xffff) | (val
& 0xffff);
514 static int (*reloc_handlers
[]) (struct module
*me
, uint32_t *location
,
516 [R_MIPS_NONE
] = apply_r_mips_none
,
517 [R_MIPS_32
] = apply_r_mips_32
,
518 [R_MIPS_26
] = apply_r_mips_26
,
519 [R_MIPS_HI16
] = apply_r_mips_hi16
,
520 [R_MIPS_LO16
] = apply_r_mips_lo16
,
521 [R_MIPS_GPREL16
] = apply_r_mips_gprel16
,
522 [R_MIPS_PC16
] = apply_r_mips_pc16
525 static char *rstrs
[] = {
526 [R_MIPS_NONE
] = "MIPS_NONE",
527 [R_MIPS_32
] = "MIPS_32",
528 [R_MIPS_26
] = "MIPS_26",
529 [R_MIPS_HI16
] = "MIPS_HI16",
530 [R_MIPS_LO16
] = "MIPS_LO16",
531 [R_MIPS_GPREL16
] = "MIPS_GPREL16",
532 [R_MIPS_PC16
] = "MIPS_PC16"
535 int apply_relocations(Elf32_Shdr
*sechdrs
,
537 unsigned int symindex
,
541 Elf32_Rel
*rel
= (void *) sechdrs
[relsec
].sh_addr
;
548 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
549 Elf32_Word r_info
= rel
[i
].r_info
;
551 /* This is where to make the change */
552 location
= (void *)sechdrs
[sechdrs
[relsec
].sh_info
].sh_addr
554 /* This is the symbol it is referring to */
555 sym
= (Elf32_Sym
*)sechdrs
[symindex
].sh_addr
556 + ELF32_R_SYM(r_info
);
558 if (!sym
->st_value
) {
559 printk(KERN_DEBUG
"%s: undefined weak symbol %s\n",
560 me
->name
, strtab
+ sym
->st_name
);
561 /* just print the warning, dont barf */
566 res
= reloc_handlers
[ELF32_R_TYPE(r_info
)](me
, location
, v
);
568 char *r
= rstrs
[ELF32_R_TYPE(r_info
)];
569 printk(KERN_WARNING
"VPE loader: .text+0x%x "
570 "relocation type %s for symbol \"%s\" failed\n",
571 rel
[i
].r_offset
, r
? r
: "UNKNOWN",
572 strtab
+ sym
->st_name
);
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 void 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
;
609 for (i
= 1; i
< n
; i
++) {
610 switch (sym
[i
].st_shndx
) {
612 /* Allocate space for the symbol in the .bss section.
613 st_value is currently size.
614 We want it to have the address of the symbol. */
616 size
= sym
[i
].st_value
;
617 sym
[i
].st_value
= bssbase
;
623 /* Don't need to do anything */
630 case SHN_MIPS_SCOMMON
:
631 printk(KERN_DEBUG
"simplify_symbols: ignoring SHN_MIPS_SCOMMON "
632 "symbol <%s> st_shndx %d\n", strtab
+ sym
[i
].st_name
,
638 secbase
= sechdrs
[sym
[i
].st_shndx
].sh_addr
;
640 if (strncmp(strtab
+ sym
[i
].st_name
, "_gp", 3) == 0) {
641 save_gp_address(secbase
, sym
[i
].st_value
);
644 sym
[i
].st_value
+= secbase
;
650 #ifdef DEBUG_ELFLOADER
651 static void dump_elfsymbols(Elf_Shdr
* sechdrs
, unsigned int symindex
,
652 const char *strtab
, struct module
*mod
)
654 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
655 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
657 printk(KERN_DEBUG
"dump_elfsymbols: n %d\n", n
);
658 for (i
= 1; i
< n
; i
++) {
659 printk(KERN_DEBUG
" i %d name <%s> 0x%x\n", i
,
660 strtab
+ sym
[i
].st_name
, sym
[i
].st_value
);
665 /* We are prepared so configure and start the VPE... */
666 static int vpe_run(struct vpe
* v
)
668 unsigned long flags
, val
, dmt_flag
;
669 struct vpe_notifications
*n
;
670 unsigned int vpeflags
;
673 /* check we are the Master VPE */
674 local_irq_save(flags
);
675 val
= read_c0_vpeconf0();
676 if (!(val
& VPECONF0_MVP
)) {
678 "VPE loader: only Master VPE's are allowed to configure MT\n");
679 local_irq_restore(flags
);
687 if (!list_empty(&v
->tc
)) {
688 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
691 local_irq_restore(flags
);
694 "VPE loader: TC %d is already in use.\n",
701 local_irq_restore(flags
);
704 "VPE loader: No TC's associated with VPE %d\n",
710 /* Put MVPE's into 'configuration state' */
711 set_c0_mvpcontrol(MVPCONTROL_VPC
);
715 /* should check it is halted, and not activated */
716 if ((read_tc_c0_tcstatus() & TCSTATUS_A
) || !(read_tc_c0_tchalt() & TCHALT_H
)) {
719 local_irq_restore(flags
);
721 printk(KERN_WARNING
"VPE loader: TC %d is already active!\n",
727 /* Write the address we want it to start running from in the TCPC register. */
728 write_tc_c0_tcrestart((unsigned long)v
->__start
);
729 write_tc_c0_tccontext((unsigned long)0);
732 * Mark the TC as activated, not interrupt exempt and not dynamically
735 val
= read_tc_c0_tcstatus();
736 val
= (val
& ~(TCSTATUS_DA
| TCSTATUS_IXMT
)) | TCSTATUS_A
;
737 write_tc_c0_tcstatus(val
);
739 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H
);
742 * The sde-kit passes 'memsize' to __start in $a3, so set something
743 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
744 * DFLT_HEAP_SIZE when you compile your program
747 mttgpr(7, physical_memsize
);
751 * bind the TC to VPE 1 as late as possible so we only have the final
752 * VPE registers to set up, and so an EJTAG probe can trigger on it
754 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE
) | 1);
756 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA
));
758 back_to_back_c0_hazard();
760 /* Set up the XTC bit in vpeconf0 to point at our tc */
761 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC
))
762 | (t
->index
<< VPECONF0_XTC_SHIFT
));
764 back_to_back_c0_hazard();
766 /* enable this VPE */
767 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA
);
769 /* clear out any left overs from a previous program */
770 write_vpe_c0_status(0);
771 write_vpe_c0_cause(0);
773 /* take system out of configuration state */
774 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
782 local_irq_restore(flags
);
784 list_for_each_entry(n
, &v
->notify
, list
)
790 static int find_vpe_symbols(struct vpe
* v
, Elf_Shdr
* sechdrs
,
791 unsigned int symindex
, const char *strtab
,
794 Elf_Sym
*sym
= (void *)sechdrs
[symindex
].sh_addr
;
795 unsigned int i
, n
= sechdrs
[symindex
].sh_size
/ sizeof(Elf_Sym
);
797 for (i
= 1; i
< n
; i
++) {
798 if (strcmp(strtab
+ sym
[i
].st_name
, "__start") == 0) {
799 v
->__start
= sym
[i
].st_value
;
802 if (strcmp(strtab
+ sym
[i
].st_name
, "vpe_shared") == 0) {
803 v
->shared_ptr
= (void *)sym
[i
].st_value
;
807 if ( (v
->__start
== 0) || (v
->shared_ptr
== NULL
))
814 * Allocates a VPE with some program code space(the load address), copies the
815 * contents of the program (p)buffer performing relocatations/etc, free's it
818 static int vpe_elfload(struct vpe
* v
)
823 char *secstrings
, *strtab
= NULL
;
824 unsigned int len
, i
, symindex
= 0, strindex
= 0, relocate
= 0;
825 struct module mod
; // so we can re-use the relocations code
827 memset(&mod
, 0, sizeof(struct module
));
828 strcpy(mod
.name
, "VPE loader");
830 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
833 /* Sanity checks against insmoding binaries or wrong arch,
835 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) != 0
836 || (hdr
->e_type
!= ET_REL
&& hdr
->e_type
!= ET_EXEC
)
837 || !elf_check_arch(hdr
)
838 || hdr
->e_shentsize
!= sizeof(*sechdrs
)) {
840 "VPE loader: program wrong arch or weird elf version\n");
845 if (hdr
->e_type
== ET_REL
)
848 if (len
< hdr
->e_shoff
+ hdr
->e_shnum
* sizeof(Elf_Shdr
)) {
849 printk(KERN_ERR
"VPE loader: program length %u truncated\n",
855 /* Convenience variables */
856 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
857 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
858 sechdrs
[0].sh_addr
= 0;
860 /* And these should exist, but gcc whinges if we don't init them */
861 symindex
= strindex
= 0;
864 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
865 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
866 && len
< sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
) {
867 printk(KERN_ERR
"VPE program length %u truncated\n",
872 /* Mark all sections sh_addr with their address in the
874 sechdrs
[i
].sh_addr
= (size_t) hdr
+ sechdrs
[i
].sh_offset
;
876 /* Internal symbols and strings. */
877 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
879 strindex
= sechdrs
[i
].sh_link
;
880 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
883 layout_sections(&mod
, hdr
, sechdrs
, secstrings
);
886 v
->load_addr
= alloc_progmem(mod
.core_size
);
887 memset(v
->load_addr
, 0, mod
.core_size
);
889 printk("VPE loader: loading to %p\n", v
->load_addr
);
892 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
895 if (!(sechdrs
[i
].sh_flags
& SHF_ALLOC
))
898 dest
= v
->load_addr
+ sechdrs
[i
].sh_entsize
;
900 if (sechdrs
[i
].sh_type
!= SHT_NOBITS
)
901 memcpy(dest
, (void *)sechdrs
[i
].sh_addr
,
903 /* Update sh_addr to point to copy in image. */
904 sechdrs
[i
].sh_addr
= (unsigned long)dest
;
906 printk(KERN_DEBUG
" section sh_name %s sh_addr 0x%x\n",
907 secstrings
+ sechdrs
[i
].sh_name
, sechdrs
[i
].sh_addr
);
910 /* Fix up syms, so that st_value is a pointer to location. */
911 simplify_symbols(sechdrs
, symindex
, strtab
, secstrings
,
914 /* Now do relocations. */
915 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
916 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
917 unsigned int info
= sechdrs
[i
].sh_info
;
919 /* Not a valid relocation section? */
920 if (info
>= hdr
->e_shnum
)
923 /* Don't bother with non-allocated sections */
924 if (!(sechdrs
[info
].sh_flags
& SHF_ALLOC
))
927 if (sechdrs
[i
].sh_type
== SHT_REL
)
928 err
= apply_relocations(sechdrs
, strtab
, symindex
, i
,
930 else if (sechdrs
[i
].sh_type
== SHT_RELA
)
931 err
= apply_relocate_add(sechdrs
, strtab
, symindex
, i
,
938 struct elf_phdr
*phdr
= (struct elf_phdr
*) ((char *)hdr
+ hdr
->e_phoff
);
940 for (i
= 0; i
< hdr
->e_phnum
; i
++) {
941 if (phdr
->p_type
!= PT_LOAD
)
944 memcpy((void *)phdr
->p_paddr
, (char *)hdr
+ phdr
->p_offset
, phdr
->p_filesz
);
945 memset((void *)phdr
->p_paddr
+ phdr
->p_filesz
, 0, phdr
->p_memsz
- phdr
->p_filesz
);
949 for (i
= 0; i
< hdr
->e_shnum
; i
++) {
950 /* Internal symbols and strings. */
951 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
953 strindex
= sechdrs
[i
].sh_link
;
954 strtab
= (char *)hdr
+ sechdrs
[strindex
].sh_offset
;
956 /* mark the symtab's address for when we try to find the
958 sechdrs
[i
].sh_addr
= (size_t) hdr
+ sechdrs
[i
].sh_offset
;
963 /* make sure it's physically written out */
964 flush_icache_range((unsigned long)v
->load_addr
,
965 (unsigned long)v
->load_addr
+ v
->len
);
967 if ((find_vpe_symbols(v
, sechdrs
, symindex
, strtab
, &mod
)) < 0) {
968 if (v
->__start
== 0) {
969 printk(KERN_WARNING
"VPE loader: program does not contain "
970 "a __start symbol\n");
974 if (v
->shared_ptr
== NULL
)
975 printk(KERN_WARNING
"VPE loader: "
976 "program does not contain vpe_shared symbol.\n"
977 " Unable to use AMVP (AP/SP) facilities.\n");
980 printk(" elf loaded\n");
984 static void cleanup_tc(struct tc
*tc
)
987 unsigned int mtflags
, vpflags
;
990 local_irq_save(flags
);
993 /* Put MVPE's into 'configuration state' */
994 set_c0_mvpcontrol(MVPCONTROL_VPC
);
997 tmp
= read_tc_c0_tcstatus();
999 /* mark not allocated and not dynamically allocatable */
1000 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
1001 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
1002 write_tc_c0_tcstatus(tmp
);
1004 write_tc_c0_tchalt(TCHALT_H
);
1007 /* bind it to anything other than VPE1 */
1008 // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1010 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1013 local_irq_restore(flags
);
1016 static int getcwd(char *buff
, int size
)
1018 mm_segment_t old_fs
;
1024 ret
= sys_getcwd(buff
, size
);
1031 /* checks VPE is unused and gets ready to load program */
1032 static int vpe_open(struct inode
*inode
, struct file
*filp
)
1034 enum vpe_state state
;
1035 struct vpe_notifications
*not;
1039 if (minor
!= iminor(inode
)) {
1040 /* assume only 1 device at the moment. */
1041 printk(KERN_WARNING
"VPE loader: only vpe1 is supported\n");
1045 if ((v
= get_vpe(tclimit
)) == NULL
) {
1046 printk(KERN_WARNING
"VPE loader: unable to get vpe\n");
1050 state
= xchg(&v
->state
, VPE_STATE_INUSE
);
1051 if (state
!= VPE_STATE_UNUSED
) {
1052 printk(KERN_DEBUG
"VPE loader: tc in use dumping regs\n");
1054 list_for_each_entry(not, &v
->notify
, list
) {
1058 release_progmem(v
->load_addr
);
1059 cleanup_tc(get_tc(tclimit
));
1062 /* this of-course trashes what was there before... */
1063 v
->pbuffer
= vmalloc(P_SIZE
);
1065 v
->load_addr
= NULL
;
1068 v
->uid
= filp
->f_uid
;
1069 v
->gid
= filp
->f_gid
;
1071 #ifdef CONFIG_MIPS_APSP_KSPD
1072 /* get kspd to tell us when a syscall_exit happens */
1073 if (!kspd_events_reqd
) {
1074 kspd_notify(&kspd_events
);
1080 ret
= getcwd(v
->cwd
, VPE_PATH_MAX
);
1082 printk(KERN_WARNING
"VPE loader: open, getcwd returned %d\n", ret
);
1084 v
->shared_ptr
= NULL
;
1090 static int vpe_release(struct inode
*inode
, struct file
*filp
)
1096 v
= get_vpe(tclimit
);
1100 hdr
= (Elf_Ehdr
*) v
->pbuffer
;
1101 if (memcmp(hdr
->e_ident
, ELFMAG
, 4) == 0) {
1102 if (vpe_elfload(v
) >= 0) {
1105 printk(KERN_WARNING
"VPE loader: ELF load failed.\n");
1109 printk(KERN_WARNING
"VPE loader: only elf files are supported\n");
1113 /* It's good to be able to run the SP and if it chokes have a look at
1114 the /dev/rt?. But if we reset the pointer to the shared struct we
1115 loose what has happened. So perhaps if garbage is sent to the vpe
1116 device, use it as a trigger for the reset. Hopefully a nice
1117 executable will be along shortly. */
1119 v
->shared_ptr
= NULL
;
1121 // cleanup any temp buffers
1128 static ssize_t
vpe_write(struct file
*file
, const char __user
* buffer
,
1129 size_t count
, loff_t
* ppos
)
1134 if (iminor(file
->f_path
.dentry
->d_inode
) != minor
)
1137 v
= get_vpe(tclimit
);
1141 if (v
->pbuffer
== NULL
) {
1142 printk(KERN_ERR
"VPE loader: no buffer for program\n");
1146 if ((count
+ v
->len
) > v
->plen
) {
1148 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1152 count
-= copy_from_user(v
->pbuffer
+ v
->len
, buffer
, count
);
1160 static const struct file_operations vpe_fops
= {
1161 .owner
= THIS_MODULE
,
1163 .release
= vpe_release
,
1167 /* module wrapper entry points */
1169 vpe_handle
vpe_alloc(void)
1175 for (i
= 1; i
< MAX_VPES
; i
++) {
1176 if ((v
= get_vpe(i
)) != NULL
) {
1177 v
->state
= VPE_STATE_INUSE
;
1184 EXPORT_SYMBOL(vpe_alloc
);
1186 /* start running from here */
1187 int vpe_start(vpe_handle vpe
, unsigned long start
)
1189 struct vpe
*v
= vpe
;
1195 EXPORT_SYMBOL(vpe_start
);
1197 /* halt it for now */
1198 int vpe_stop(vpe_handle vpe
)
1200 struct vpe
*v
= vpe
;
1202 unsigned int evpe_flags
;
1204 evpe_flags
= dvpe();
1206 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) != NULL
) {
1209 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1217 EXPORT_SYMBOL(vpe_stop
);
1219 /* I've done with it thank you */
1220 int vpe_free(vpe_handle vpe
)
1222 struct vpe
*v
= vpe
;
1224 unsigned int evpe_flags
;
1226 if ((t
= list_entry(v
->tc
.next
, struct tc
, tc
)) == NULL
) {
1230 evpe_flags
= dvpe();
1232 /* Put MVPE's into 'configuration state' */
1233 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1236 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA
);
1239 write_tc_c0_tchalt(TCHALT_H
);
1242 /* mark the TC unallocated */
1243 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A
);
1245 v
->state
= VPE_STATE_UNUSED
;
1247 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1253 EXPORT_SYMBOL(vpe_free
);
1255 void *vpe_get_shared(int index
)
1259 if ((v
= get_vpe(index
)) == NULL
)
1262 return v
->shared_ptr
;
1265 EXPORT_SYMBOL(vpe_get_shared
);
1267 int vpe_getuid(int index
)
1271 if ((v
= get_vpe(index
)) == NULL
)
1277 EXPORT_SYMBOL(vpe_getuid
);
1279 int vpe_getgid(int index
)
1283 if ((v
= get_vpe(index
)) == NULL
)
1289 EXPORT_SYMBOL(vpe_getgid
);
1291 int vpe_notify(int index
, struct vpe_notifications
*notify
)
1295 if ((v
= get_vpe(index
)) == NULL
)
1298 list_add(¬ify
->list
, &v
->notify
);
1302 EXPORT_SYMBOL(vpe_notify
);
1304 char *vpe_getcwd(int index
)
1308 if ((v
= get_vpe(index
)) == NULL
)
1314 EXPORT_SYMBOL(vpe_getcwd
);
1316 #ifdef CONFIG_MIPS_APSP_KSPD
1317 static void kspd_sp_exit( int sp_id
)
1319 cleanup_tc(get_tc(sp_id
));
1323 static ssize_t
store_kill(struct device
*dev
, struct device_attribute
*attr
,
1324 const char *buf
, size_t len
)
1326 struct vpe
*vpe
= get_vpe(tclimit
);
1327 struct vpe_notifications
*not;
1329 list_for_each_entry(not, &vpe
->notify
, list
) {
1333 release_progmem(vpe
->load_addr
);
1334 cleanup_tc(get_tc(tclimit
));
1341 static ssize_t
show_ntcs(struct device
*cd
, struct device_attribute
*attr
,
1344 struct vpe
*vpe
= get_vpe(tclimit
);
1346 return sprintf(buf
, "%d\n", vpe
->ntcs
);
1349 static ssize_t
store_ntcs(struct device
*dev
, struct device_attribute
*attr
,
1350 const char *buf
, size_t len
)
1352 struct vpe
*vpe
= get_vpe(tclimit
);
1356 new = simple_strtoul(buf
, &endp
, 0);
1360 if (new == 0 || new > (hw_tcs
- tclimit
))
1371 static struct device_attribute vpe_class_attributes
[] = {
1372 __ATTR(kill
, S_IWUSR
, NULL
, store_kill
),
1373 __ATTR(ntcs
, S_IRUGO
| S_IWUSR
, show_ntcs
, store_ntcs
),
1377 static void vpe_device_release(struct device
*cd
)
1382 struct class vpe_class
= {
1384 .owner
= THIS_MODULE
,
1385 .dev_release
= vpe_device_release
,
1386 .dev_attrs
= vpe_class_attributes
,
1389 struct device vpe_device
;
1391 static int __init
vpe_module_init(void)
1393 unsigned int mtflags
, vpflags
;
1394 unsigned long flags
, val
;
1395 struct vpe
*v
= NULL
;
1399 if (!cpu_has_mipsmt
) {
1400 printk("VPE loader: not a MIPS MT capable processor\n");
1404 if (vpelimit
== 0) {
1405 printk(KERN_WARNING
"No VPEs reserved for AP/SP, not "
1406 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1407 "kernel argument\n");
1413 printk(KERN_WARNING
"No TCs reserved for AP/SP, not "
1414 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1415 "kernel argument\n");
1420 major
= register_chrdev(0, module_name
, &vpe_fops
);
1422 printk("VPE loader: unable to register character device\n");
1426 err
= class_register(&vpe_class
);
1428 printk(KERN_ERR
"vpe_class registration failed\n");
1432 device_initialize(&vpe_device
);
1433 vpe_device
.class = &vpe_class
,
1434 vpe_device
.parent
= NULL
,
1435 strlcpy(vpe_device
.bus_id
, "vpe1", BUS_ID_SIZE
);
1436 vpe_device
.devt
= MKDEV(major
, minor
);
1437 err
= device_add(&vpe_device
);
1439 printk(KERN_ERR
"Adding vpe_device failed\n");
1443 local_irq_save(flags
);
1447 /* Put MVPE's into 'configuration state' */
1448 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1450 /* dump_mtregs(); */
1452 val
= read_c0_mvpconf0();
1453 hw_tcs
= (val
& MVPCONF0_PTC
) + 1;
1454 hw_vpes
= ((val
& MVPCONF0_PVPE
) >> MVPCONF0_PVPE_SHIFT
) + 1;
1456 for (tc
= tclimit
; tc
< hw_tcs
; tc
++) {
1458 * Must re-enable multithreading temporarily or in case we
1459 * reschedule send IPIs or similar we might hang.
1461 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1464 local_irq_restore(flags
);
1471 local_irq_save(flags
);
1474 set_c0_mvpcontrol(MVPCONTROL_VPC
);
1480 if ((v
= alloc_vpe(tc
)) == NULL
) {
1481 printk(KERN_WARNING
"VPE: unable to allocate VPE\n");
1486 v
->ntcs
= hw_tcs
- tclimit
;
1488 /* add the tc to the list of this vpe's tc's. */
1489 list_add(&t
->tc
, &v
->tc
);
1491 /* deactivate all but vpe0 */
1492 if (tc
>= tclimit
) {
1493 unsigned long tmp
= read_vpe_c0_vpeconf0();
1495 tmp
&= ~VPECONF0_VPA
;
1498 tmp
|= VPECONF0_MVP
;
1499 write_vpe_c0_vpeconf0(tmp
);
1502 /* disable multi-threading with TC's */
1503 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE
);
1505 if (tc
>= vpelimit
) {
1507 * Set config to be the same as vpe0,
1508 * particularly kseg0 coherency alg
1510 write_vpe_c0_config(read_c0_config());
1515 t
->pvpe
= v
; /* set the parent vpe */
1517 if (tc
>= tclimit
) {
1522 /* Any TC that is bound to VPE0 gets left as is - in case
1523 we are running SMTC on VPE0. A TC that is bound to any
1524 other VPE gets bound to VPE0, ideally I'd like to make
1525 it homeless but it doesn't appear to let me bind a TC
1526 to a non-existent VPE. Which is perfectly reasonable.
1528 The (un)bound state is visible to an EJTAG probe so may
1532 if (((tmp
= read_tc_c0_tcbind()) & TCBIND_CURVPE
)) {
1533 /* tc is bound >vpe0 */
1534 write_tc_c0_tcbind(tmp
& ~TCBIND_CURVPE
);
1536 t
->pvpe
= get_vpe(0); /* set the parent vpe */
1540 write_tc_c0_tchalt(TCHALT_H
);
1543 tmp
= read_tc_c0_tcstatus();
1545 /* mark not activated and not dynamically allocatable */
1546 tmp
&= ~(TCSTATUS_A
| TCSTATUS_DA
);
1547 tmp
|= TCSTATUS_IXMT
; /* interrupt exempt */
1548 write_tc_c0_tcstatus(tmp
);
1553 /* release config state */
1554 clear_c0_mvpcontrol(MVPCONTROL_VPC
);
1558 local_irq_restore(flags
);
1560 #ifdef CONFIG_MIPS_APSP_KSPD
1561 kspd_events
.kspd_sp_exit
= kspd_sp_exit
;
1566 class_unregister(&vpe_class
);
1568 unregister_chrdev(major
, module_name
);
1574 static void __exit
vpe_module_exit(void)
1578 list_for_each_entry_safe(v
, n
, &vpecontrol
.vpe_list
, list
) {
1579 if (v
->state
!= VPE_STATE_UNUSED
) {
1584 device_del(&vpe_device
);
1585 unregister_chrdev(major
, module_name
);
1588 module_init(vpe_module_init
);
1589 module_exit(vpe_module_exit
);
1590 MODULE_DESCRIPTION("MIPS VPE Loader");
1591 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1592 MODULE_LICENSE("GPL");