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");