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 /* static __attribute_used__ void dump_vpe(struct vpe * v); */
158 extern void save_gp_address(unsigned int secbase, unsigned int rel);
160 /* get the vpe associated with this minor */
161 struct vpe *get_vpe(int minor)
168 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
169 if (v->minor == minor)
176 /* get the vpe associated with this minor */
177 struct tc *get_tc(int index)
181 list_for_each_entry(t, &vpecontrol.tc_list, list) {
182 if (t->index == index)
189 struct tc *get_tc_unused(void)
193 list_for_each_entry(t, &vpecontrol.tc_list, list) {
194 if (t->state == TC_STATE_UNUSED)
201 /* allocate a vpe and associate it with this minor (or index) */
202 struct vpe *alloc_vpe(int minor)
206 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) {
210 INIT_LIST_HEAD(&v->tc);
211 list_add_tail(&v->list, &vpecontrol.vpe_list);
213 INIT_LIST_HEAD(&v->notify);
218 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
219 struct tc *alloc_tc(int index)
223 if ((t = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL) {
227 INIT_LIST_HEAD(&t->tc);
228 list_add_tail(&t->list, &vpecontrol.tc_list);
235 /* clean up and free everything */
236 void release_vpe(struct vpe *v)
244 void dump_mtregs(void)
248 val = read_c0_config3();
249 printk("config3 0x%lx MT %ld\n", val,
250 (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
252 val = read_c0_mvpcontrol();
253 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
254 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
255 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
256 (val & MVPCONTROL_EVP));
258 val = read_c0_mvpconf0();
259 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
260 (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
261 val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
264 /* Find some VPE program space */
265 static void *alloc_progmem(unsigned long len)
267 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
268 /* this means you must tell linux to use less memory than you physically have */
269 return pfn_to_kaddr(max_pfn);
271 // simple grab some mem for now
272 return kmalloc(len, GFP_KERNEL);
276 static void release_progmem(void *ptr)
278 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
283 /* Update size with this section: return offset. */
284 static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
288 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
289 *size = ret + sechdr->sh_size;
293 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
294 might -- code, read-only data, read-write data, small data. Tally
295 sizes, and place the offsets into sh_entsize fields: high bit means it
297 static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
298 Elf_Shdr * sechdrs, const char *secstrings)
300 static unsigned long const masks[][2] = {
301 /* NOTE: all executable code must be the first section
302 * in this array; otherwise modify the text_size
303 * finder in the two loops below */
304 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
305 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
306 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
307 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
311 for (i = 0; i < hdr->e_shnum; i++)
312 sechdrs[i].sh_entsize = ~0UL;
314 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
315 for (i = 0; i < hdr->e_shnum; ++i) {
316 Elf_Shdr *s = &sechdrs[i];
318 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
319 if ((s->sh_flags & masks[m][0]) != masks[m][0]
320 || (s->sh_flags & masks[m][1])
321 || s->sh_entsize != ~0UL)
323 s->sh_entsize = get_offset(&mod->core_size, s);
327 mod->core_text_size = mod->core_size;
333 /* from module-elf32.c, but subverted a little */
336 struct mips_hi16 *next;
341 static struct mips_hi16 *mips_hi16_list;
342 static unsigned int gp_offs, gp_addr;
344 static int apply_r_mips_none(struct module *me, uint32_t *location,
350 static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
355 if( !(*location & 0xffff) ) {
356 rel = (int)v - gp_addr;
359 /* .sbss + gp(relative) + offset */
361 rel = (int)(short)((int)v + gp_offs +
362 (int)(short)(*location & 0xffff) - gp_addr);
365 if( (rel > 32768) || (rel < -32768) ) {
366 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
367 "relative address 0x%x out of range of gp register\n",
372 *location = (*location & 0xffff0000) | (rel & 0xffff);
377 static int apply_r_mips_pc16(struct module *me, uint32_t *location,
381 rel = (((unsigned int)v - (unsigned int)location));
382 rel >>= 2; // because the offset is in _instructions_ not bytes.
383 rel -= 1; // and one instruction less due to the branch delay slot.
385 if( (rel > 32768) || (rel < -32768) ) {
386 printk(KERN_DEBUG "VPE loader: "
387 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
391 *location = (*location & 0xffff0000) | (rel & 0xffff);
396 static int apply_r_mips_32(struct module *me, uint32_t *location,
404 static int apply_r_mips_26(struct module *me, uint32_t *location,
408 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
409 " unaligned relocation\n");
414 * Not desperately convinced this is a good check of an overflow condition
415 * anyway. But it gets in the way of handling undefined weak symbols which
416 * we want to set to zero.
417 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
419 * "module %s: relocation overflow\n",
425 *location = (*location & ~0x03ffffff) |
426 ((*location + (v >> 2)) & 0x03ffffff);
430 static int apply_r_mips_hi16(struct module *me, uint32_t *location,
436 * We cannot relocate this one now because we don't know the value of
437 * the carry we need to add. Save the information, and let LO16 do the
440 n = kmalloc(sizeof *n, GFP_KERNEL);
446 n->next = mips_hi16_list;
452 static int apply_r_mips_lo16(struct module *me, uint32_t *location,
455 unsigned long insnlo = *location;
456 Elf32_Addr val, vallo;
458 /* Sign extend the addend we extract from the lo insn. */
459 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
461 if (mips_hi16_list != NULL) {
466 struct mips_hi16 *next;
470 * The value for the HI16 had best be the same.
473 printk(KERN_DEBUG "VPE loader: "
474 "apply_r_mips_lo16/hi16: "
475 "inconsistent value information\n");
480 * Do the HI16 relocation. Note that we actually don't
481 * need to know anything about the LO16 itself, except
482 * where to find the low 16 bits of the addend needed
486 val = ((insn & 0xffff) << 16) + vallo;
490 * Account for the sign extension that will happen in
493 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
495 insn = (insn & ~0xffff) | val;
503 mips_hi16_list = NULL;
507 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
510 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
516 static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
518 [R_MIPS_NONE] = apply_r_mips_none,
519 [R_MIPS_32] = apply_r_mips_32,
520 [R_MIPS_26] = apply_r_mips_26,
521 [R_MIPS_HI16] = apply_r_mips_hi16,
522 [R_MIPS_LO16] = apply_r_mips_lo16,
523 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
524 [R_MIPS_PC16] = apply_r_mips_pc16
527 static char *rstrs[] = {
528 [R_MIPS_NONE] = "MIPS_NONE",
529 [R_MIPS_32] = "MIPS_32",
530 [R_MIPS_26] = "MIPS_26",
531 [R_MIPS_HI16] = "MIPS_HI16",
532 [R_MIPS_LO16] = "MIPS_LO16",
533 [R_MIPS_GPREL16] = "MIPS_GPREL16",
534 [R_MIPS_PC16] = "MIPS_PC16"
537 int apply_relocations(Elf32_Shdr *sechdrs,
539 unsigned int symindex,
543 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
550 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
551 Elf32_Word r_info = rel[i].r_info;
553 /* This is where to make the change */
554 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
556 /* This is the symbol it is referring to */
557 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
558 + ELF32_R_SYM(r_info);
560 if (!sym->st_value) {
561 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
562 me->name, strtab + sym->st_name);
563 /* just print the warning, dont barf */
568 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
570 char *r = rstrs[ELF32_R_TYPE(r_info)];
571 printk(KERN_WARNING "VPE loader: .text+0x%x "
572 "relocation type %s for symbol \"%s\" failed\n",
573 rel[i].r_offset, r ? r : "UNKNOWN",
574 strtab + sym->st_name);
582 void save_gp_address(unsigned int secbase, unsigned int rel)
584 gp_addr = secbase + rel;
585 gp_offs = gp_addr - (secbase & 0xffff0000);
587 /* end module-elf32.c */
591 /* Change all symbols so that sh_value encodes the pointer directly. */
592 static void simplify_symbols(Elf_Shdr * sechdrs,
593 unsigned int symindex,
595 const char *secstrings,
596 unsigned int nsecs, struct module *mod)
598 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
599 unsigned long secbase, bssbase = 0;
600 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
603 /* find the .bss section for COMMON symbols */
604 for (i = 0; i < nsecs; i++) {
605 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
606 bssbase = sechdrs[i].sh_addr;
611 for (i = 1; i < n; i++) {
612 switch (sym[i].st_shndx) {
614 /* Allocate space for the symbol in the .bss section.
615 st_value is currently size.
616 We want it to have the address of the symbol. */
618 size = sym[i].st_value;
619 sym[i].st_value = bssbase;
625 /* Don't need to do anything */
632 case SHN_MIPS_SCOMMON:
633 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON"
634 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
640 secbase = sechdrs[sym[i].st_shndx].sh_addr;
642 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
643 save_gp_address(secbase, sym[i].st_value);
646 sym[i].st_value += secbase;
652 #ifdef DEBUG_ELFLOADER
653 static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
654 const char *strtab, struct module *mod)
656 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
657 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
659 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
660 for (i = 1; i < n; i++) {
661 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
662 strtab + sym[i].st_name, sym[i].st_value);
667 static void dump_tc(struct tc *t)
672 printk(KERN_DEBUG "VPE loader: TC index %d targtc %ld "
673 "TCStatus 0x%lx halt 0x%lx\n",
674 t->index, read_c0_vpecontrol() & VPECONTROL_TARGTC,
675 read_tc_c0_tcstatus(), read_tc_c0_tchalt());
677 printk(KERN_DEBUG " tcrestart 0x%lx\n", read_tc_c0_tcrestart());
678 printk(KERN_DEBUG " tcbind 0x%lx\n", read_tc_c0_tcbind());
680 val = read_c0_vpeconf0();
681 printk(KERN_DEBUG " VPEConf0 0x%lx MVP %ld\n", val,
682 (val & VPECONF0_MVP) >> VPECONF0_MVP_SHIFT);
684 printk(KERN_DEBUG " c0 status 0x%lx\n", read_vpe_c0_status());
685 printk(KERN_DEBUG " c0 cause 0x%lx\n", read_vpe_c0_cause());
687 printk(KERN_DEBUG " c0 badvaddr 0x%lx\n", read_vpe_c0_badvaddr());
688 printk(KERN_DEBUG " c0 epc 0x%lx\n", read_vpe_c0_epc());
691 static void dump_tclist(void)
695 list_for_each_entry(t, &vpecontrol.tc_list, list) {
700 /* We are prepared so configure and start the VPE... */
701 static int vpe_run(struct vpe * v)
703 struct vpe_notifications *n;
704 unsigned long val, dmt_flag;
707 /* check we are the Master VPE */
708 val = read_c0_vpeconf0();
709 if (!(val & VPECONF0_MVP)) {
711 "VPE loader: only Master VPE's are allowed to configure MT\n");
715 /* disable MT (using dvpe) */
718 if (!list_empty(&v->tc)) {
719 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
720 printk(KERN_WARNING "VPE loader: TC %d is already in use.\n",
725 printk(KERN_WARNING "VPE loader: No TC's associated with VPE %d\n",
730 /* Put MVPE's into 'configuration state' */
731 set_c0_mvpcontrol(MVPCONTROL_VPC);
735 /* should check it is halted, and not activated */
736 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
737 printk(KERN_WARNING "VPE loader: TC %d is already doing something!\n",
744 * Disable multi-threaded execution whilst we activate, clear the
745 * halt bit and bound the tc to the other VPE...
749 /* Write the address we want it to start running from in the TCPC register. */
750 write_tc_c0_tcrestart((unsigned long)v->__start);
751 write_tc_c0_tccontext((unsigned long)0);
753 * Mark the TC as activated, not interrupt exempt and not dynamically
756 val = read_tc_c0_tcstatus();
757 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
758 write_tc_c0_tcstatus(val);
760 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
763 * The sde-kit passes 'memsize' to __start in $a3, so set something
764 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
765 * DFLT_HEAP_SIZE when you compile your program
767 mttgpr(7, physical_memsize);
772 * bind the TC to VPE 1 as late as possible so we only have the final
773 * VPE registers to set up, and so an EJTAG probe can trigger on it
775 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | v->minor);
777 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
779 back_to_back_c0_hazard();
781 /* Set up the XTC bit in vpeconf0 to point at our tc */
782 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
783 | (t->index << VPECONF0_XTC_SHIFT));
785 back_to_back_c0_hazard();
787 /* enable this VPE */
788 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
790 /* clear out any left overs from a previous program */
791 write_vpe_c0_status(0);
792 write_vpe_c0_cause(0);
794 /* take system out of configuration state */
795 clear_c0_mvpcontrol(MVPCONTROL_VPC);
797 /* now safe to re-enable multi-threading */
803 list_for_each_entry(n, &v->notify, list) {
810 static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
811 unsigned int symindex, const char *strtab,
814 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
815 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
817 for (i = 1; i < n; i++) {
818 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
819 v->__start = sym[i].st_value;
822 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
823 v->shared_ptr = (void *)sym[i].st_value;
827 if ( (v->__start == 0) || (v->shared_ptr == NULL))
834 * Allocates a VPE with some program code space(the load address), copies the
835 * contents of the program (p)buffer performing relocatations/etc, free's it
838 static int vpe_elfload(struct vpe * v)
843 char *secstrings, *strtab = NULL;
844 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
845 struct module mod; // so we can re-use the relocations code
847 memset(&mod, 0, sizeof(struct module));
848 strcpy(mod.name, "VPE loader");
850 hdr = (Elf_Ehdr *) v->pbuffer;
853 /* Sanity checks against insmoding binaries or wrong arch,
855 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
856 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
857 || !elf_check_arch(hdr)
858 || hdr->e_shentsize != sizeof(*sechdrs)) {
860 "VPE loader: program wrong arch or weird elf version\n");
865 if (hdr->e_type == ET_REL)
868 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
869 printk(KERN_ERR "VPE loader: program length %u truncated\n",
875 /* Convenience variables */
876 sechdrs = (void *)hdr + hdr->e_shoff;
877 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
878 sechdrs[0].sh_addr = 0;
880 /* And these should exist, but gcc whinges if we don't init them */
881 symindex = strindex = 0;
884 for (i = 1; i < hdr->e_shnum; i++) {
885 if (sechdrs[i].sh_type != SHT_NOBITS
886 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
887 printk(KERN_ERR "VPE program length %u truncated\n",
892 /* Mark all sections sh_addr with their address in the
894 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
896 /* Internal symbols and strings. */
897 if (sechdrs[i].sh_type == SHT_SYMTAB) {
899 strindex = sechdrs[i].sh_link;
900 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
903 layout_sections(&mod, hdr, sechdrs, secstrings);
906 v->load_addr = alloc_progmem(mod.core_size);
907 memset(v->load_addr, 0, mod.core_size);
909 printk("VPE loader: loading to %p\n", v->load_addr);
912 for (i = 0; i < hdr->e_shnum; i++) {
915 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
918 dest = v->load_addr + sechdrs[i].sh_entsize;
920 if (sechdrs[i].sh_type != SHT_NOBITS)
921 memcpy(dest, (void *)sechdrs[i].sh_addr,
923 /* Update sh_addr to point to copy in image. */
924 sechdrs[i].sh_addr = (unsigned long)dest;
926 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
927 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
930 /* Fix up syms, so that st_value is a pointer to location. */
931 simplify_symbols(sechdrs, symindex, strtab, secstrings,
934 /* Now do relocations. */
935 for (i = 1; i < hdr->e_shnum; i++) {
936 const char *strtab = (char *)sechdrs[strindex].sh_addr;
937 unsigned int info = sechdrs[i].sh_info;
939 /* Not a valid relocation section? */
940 if (info >= hdr->e_shnum)
943 /* Don't bother with non-allocated sections */
944 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
947 if (sechdrs[i].sh_type == SHT_REL)
948 err = apply_relocations(sechdrs, strtab, symindex, i,
950 else if (sechdrs[i].sh_type == SHT_RELA)
951 err = apply_relocate_add(sechdrs, strtab, symindex, i,
958 for (i = 0; i < hdr->e_shnum; i++) {
960 /* Internal symbols and strings. */
961 if (sechdrs[i].sh_type == SHT_SYMTAB) {
963 strindex = sechdrs[i].sh_link;
964 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
966 /* mark the symtab's address for when we try to find the
968 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
971 /* filter sections we dont want in the final image */
972 if (!(sechdrs[i].sh_flags & SHF_ALLOC) ||
973 (sechdrs[i].sh_type == SHT_MIPS_REGINFO)) {
974 printk( KERN_DEBUG " ignoring section, "
975 "name %s type %x address 0x%x \n",
976 secstrings + sechdrs[i].sh_name,
977 sechdrs[i].sh_type, sechdrs[i].sh_addr);
981 if (sechdrs[i].sh_addr < (unsigned int)v->load_addr) {
982 printk( KERN_WARNING "VPE loader: "
983 "fully linked image has invalid section, "
984 "name %s type %x address 0x%x, before load "
986 secstrings + sechdrs[i].sh_name,
987 sechdrs[i].sh_type, sechdrs[i].sh_addr,
988 (unsigned int)v->load_addr);
992 printk(KERN_DEBUG " copying section sh_name %s, sh_addr 0x%x "
993 "size 0x%x0 from x%p\n",
994 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr,
995 sechdrs[i].sh_size, hdr + sechdrs[i].sh_offset);
997 if (sechdrs[i].sh_type != SHT_NOBITS)
998 memcpy((void *)sechdrs[i].sh_addr,
999 (char *)hdr + sechdrs[i].sh_offset,
1000 sechdrs[i].sh_size);
1002 memset((void *)sechdrs[i].sh_addr, 0, sechdrs[i].sh_size);
1006 /* make sure it's physically written out */
1007 flush_icache_range((unsigned long)v->load_addr,
1008 (unsigned long)v->load_addr + v->len);
1010 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
1011 if (v->__start == 0) {
1012 printk(KERN_WARNING "VPE loader: program does not contain "
1013 "a __start symbol\n");
1017 if (v->shared_ptr == NULL)
1018 printk(KERN_WARNING "VPE loader: "
1019 "program does not contain vpe_shared symbol.\n"
1020 " Unable to use AMVP (AP/SP) facilities.\n");
1023 printk(" elf loaded\n");
1027 __attribute_used__ void dump_vpe(struct vpe * v)
1033 printk(KERN_DEBUG "VPEControl 0x%lx\n", read_vpe_c0_vpecontrol());
1034 printk(KERN_DEBUG "VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0());
1036 list_for_each_entry(t, &vpecontrol.tc_list, list)
1040 static void cleanup_tc(struct tc *tc)
1044 /* Put MVPE's into 'configuration state' */
1045 set_c0_mvpcontrol(MVPCONTROL_VPC);
1048 tmp = read_tc_c0_tcstatus();
1050 /* mark not allocated and not dynamically allocatable */
1051 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1052 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1053 write_tc_c0_tcstatus(tmp);
1055 write_tc_c0_tchalt(TCHALT_H);
1057 /* bind it to anything other than VPE1 */
1058 write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1060 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1063 static int getcwd(char *buff, int size)
1065 mm_segment_t old_fs;
1071 ret = sys_getcwd(buff,size);
1078 /* checks VPE is unused and gets ready to load program */
1079 static int vpe_open(struct inode *inode, struct file *filp)
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 if (v->state != VPE_STATE_UNUSED) {
1099 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1101 dump_tc(get_tc(minor));
1103 list_for_each_entry(not, &v->notify, list) {
1107 release_progmem(v->load_addr);
1108 cleanup_tc(get_tc(minor));
1111 // allocate it so when we get write ops we know it's expected.
1112 v->state = VPE_STATE_INUSE;
1114 /* this of-course trashes what was there before... */
1115 v->pbuffer = vmalloc(P_SIZE);
1117 v->load_addr = NULL;
1120 v->uid = filp->f_uid;
1121 v->gid = filp->f_gid;
1123 #ifdef CONFIG_MIPS_APSP_KSPD
1124 /* get kspd to tell us when a syscall_exit happens */
1125 if (!kspd_events_reqd) {
1126 kspd_notify(&kspd_events);
1132 ret = getcwd(v->cwd, VPE_PATH_MAX);
1134 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1136 v->shared_ptr = NULL;
1141 static int vpe_release(struct inode *inode, struct file *filp)
1147 minor = iminor(inode);
1148 if ((v = get_vpe(minor)) == NULL)
1151 // simple case of fire and forget, so tell the VPE to run...
1153 hdr = (Elf_Ehdr *) v->pbuffer;
1154 if (memcmp(hdr->e_ident, ELFMAG, 4) == 0) {
1155 if (vpe_elfload(v) >= 0)
1158 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1162 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1166 /* It's good to be able to run the SP and if it chokes have a look at
1167 the /dev/rt?. But if we reset the pointer to the shared struct we
1168 loose what has happened. So perhaps if garbage is sent to the vpe
1169 device, use it as a trigger for the reset. Hopefully a nice
1170 executable will be along shortly. */
1172 v->shared_ptr = NULL;
1174 // cleanup any temp buffers
1181 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1182 size_t count, loff_t * ppos)
1188 minor = iminor(file->f_path.dentry->d_inode);
1189 if ((v = get_vpe(minor)) == NULL)
1192 if (v->pbuffer == NULL) {
1193 printk(KERN_ERR "VPE loader: no buffer for program\n");
1197 if ((count + v->len) > v->plen) {
1199 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1203 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1211 static const struct file_operations vpe_fops = {
1212 .owner = THIS_MODULE,
1214 .release = vpe_release,
1218 /* module wrapper entry points */
1220 vpe_handle vpe_alloc(void)
1226 for (i = 1; i < MAX_VPES; i++) {
1227 if ((v = get_vpe(i)) != NULL) {
1228 v->state = VPE_STATE_INUSE;
1235 EXPORT_SYMBOL(vpe_alloc);
1237 /* start running from here */
1238 int vpe_start(vpe_handle vpe, unsigned long start)
1240 struct vpe *v = vpe;
1246 EXPORT_SYMBOL(vpe_start);
1248 /* halt it for now */
1249 int vpe_stop(vpe_handle vpe)
1251 struct vpe *v = vpe;
1253 unsigned int evpe_flags;
1255 evpe_flags = dvpe();
1257 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1260 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1268 EXPORT_SYMBOL(vpe_stop);
1270 /* I've done with it thank you */
1271 int vpe_free(vpe_handle vpe)
1273 struct vpe *v = vpe;
1275 unsigned int evpe_flags;
1277 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1281 evpe_flags = dvpe();
1283 /* Put MVPE's into 'configuration state' */
1284 set_c0_mvpcontrol(MVPCONTROL_VPC);
1287 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1289 /* mark the TC unallocated and halt'ed */
1290 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1291 write_tc_c0_tchalt(TCHALT_H);
1293 v->state = VPE_STATE_UNUSED;
1295 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1301 EXPORT_SYMBOL(vpe_free);
1303 void *vpe_get_shared(int index)
1307 if ((v = get_vpe(index)) == NULL)
1310 return v->shared_ptr;
1313 EXPORT_SYMBOL(vpe_get_shared);
1315 int vpe_getuid(int index)
1319 if ((v = get_vpe(index)) == NULL)
1325 EXPORT_SYMBOL(vpe_getuid);
1327 int vpe_getgid(int index)
1331 if ((v = get_vpe(index)) == NULL)
1337 EXPORT_SYMBOL(vpe_getgid);
1339 int vpe_notify(int index, struct vpe_notifications *notify)
1343 if ((v = get_vpe(index)) == NULL)
1346 list_add(¬ify->list, &v->notify);
1350 EXPORT_SYMBOL(vpe_notify);
1352 char *vpe_getcwd(int index)
1356 if ((v = get_vpe(index)) == NULL)
1362 EXPORT_SYMBOL(vpe_getcwd);
1364 #ifdef CONFIG_MIPS_APSP_KSPD
1365 static void kspd_sp_exit( int sp_id)
1367 cleanup_tc(get_tc(sp_id));
1371 static struct device *vpe_dev;
1373 static int __init vpe_module_init(void)
1375 struct vpe *v = NULL;
1381 if (!cpu_has_mipsmt) {
1382 printk("VPE loader: not a MIPS MT capable processor\n");
1386 major = register_chrdev(0, module_name, &vpe_fops);
1388 printk("VPE loader: unable to register character device\n");
1392 dev = device_create(mt_class, NULL, MKDEV(major, minor),
1403 /* Put MVPE's into 'configuration state' */
1404 set_c0_mvpcontrol(MVPCONTROL_VPC);
1406 /* dump_mtregs(); */
1409 val = read_c0_mvpconf0();
1410 for (i = 0; i < ((val & MVPCONF0_PTC) + 1); i++) {
1414 if (i < ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1) {
1417 if ((v = alloc_vpe(i)) == NULL) {
1418 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1422 /* add the tc to the list of this vpe's tc's. */
1423 list_add(&t->tc, &v->tc);
1425 /* deactivate all but vpe0 */
1427 unsigned long tmp = read_vpe_c0_vpeconf0();
1429 tmp &= ~VPECONF0_VPA;
1432 tmp |= VPECONF0_MVP;
1433 write_vpe_c0_vpeconf0(tmp);
1436 /* disable multi-threading with TC's */
1437 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1440 write_vpe_c0_status((read_c0_status() &
1441 ~(ST0_IM | ST0_IE | ST0_KSU))
1445 * Set config to be the same as vpe0,
1446 * particularly kseg0 coherency alg
1448 write_vpe_c0_config(read_c0_config());
1453 t->pvpe = v; /* set the parent vpe */
1460 /* Any TC that is bound to VPE0 gets left as is - in case
1461 we are running SMTC on VPE0. A TC that is bound to any
1462 other VPE gets bound to VPE0, ideally I'd like to make
1463 it homeless but it doesn't appear to let me bind a TC
1464 to a non-existent VPE. Which is perfectly reasonable.
1466 The (un)bound state is visible to an EJTAG probe so may
1470 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1471 /* tc is bound >vpe0 */
1472 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1474 t->pvpe = get_vpe(0); /* set the parent vpe */
1477 tmp = read_tc_c0_tcstatus();
1479 /* mark not activated and not dynamically allocatable */
1480 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1481 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1482 write_tc_c0_tcstatus(tmp);
1484 write_tc_c0_tchalt(TCHALT_H);
1488 /* release config state */
1489 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1491 #ifdef CONFIG_MIPS_APSP_KSPD
1492 kspd_events.kspd_sp_exit = kspd_sp_exit;
1497 unregister_chrdev(major, module_name);
1502 static void __exit vpe_module_exit(void)
1506 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1507 if (v->state != VPE_STATE_UNUSED) {
1512 device_destroy(mt_class, MKDEV(major, minor));
1513 unregister_chrdev(major, module_name);
1516 module_init(vpe_module_init);
1517 module_exit(vpe_module_exit);
1518 MODULE_DESCRIPTION("MIPS VPE Loader");
1519 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1520 MODULE_LICENSE("GPL");