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");