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/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/processor.h>
52 #include <asm/system.h>
56 typedef void *vpe_handle;
58 #ifndef ARCH_SHF_SMALL
59 #define ARCH_SHF_SMALL 0
62 /* If this is set, the section belongs in the init part of the module */
63 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
65 static char module_name[] = "vpe";
68 #ifdef CONFIG_MIPS_APSP_KSPD
69 static struct kspd_notifications kspd_events;
70 static int kspd_events_reqd = 0;
73 /* grab the likely amount of memory we will need. */
74 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
75 #define P_SIZE (2 * 1024 * 1024)
77 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
78 #define P_SIZE (256 * 1024)
81 extern unsigned long physical_memsize;
84 #define VPE_PATH_MAX 256
100 enum vpe_state state;
102 /* (device) minor associated with this vpe */
105 /* elfloader stuff */
110 unsigned int uid, gid;
111 char cwd[VPE_PATH_MAX];
113 unsigned long __start;
115 /* tc's associated with this vpe */
118 /* The list of vpe's */
119 struct list_head list;
121 /* shared symbol address */
124 /* the list of who wants to know when something major happens */
125 struct list_head notify;
135 /* The list of TC's with this VPE */
138 /* The global list of tc's */
139 struct list_head list;
143 /* Virtual processing elements */
144 struct list_head vpe_list;
146 /* Thread contexts */
147 struct list_head tc_list;
149 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
150 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
153 static void release_progmem(void *ptr);
154 /* static __attribute_used__ void dump_vpe(struct vpe * v); */
155 extern void save_gp_address(unsigned int secbase, unsigned int rel);
157 /* get the vpe associated with this minor */
158 struct vpe *get_vpe(int minor)
165 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
166 if (v->minor == minor)
173 /* get the vpe associated with this minor */
174 struct tc *get_tc(int index)
178 list_for_each_entry(t, &vpecontrol.tc_list, list) {
179 if (t->index == index)
186 struct tc *get_tc_unused(void)
190 list_for_each_entry(t, &vpecontrol.tc_list, list) {
191 if (t->state == TC_STATE_UNUSED)
198 /* allocate a vpe and associate it with this minor (or index) */
199 struct vpe *alloc_vpe(int minor)
203 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) {
207 INIT_LIST_HEAD(&v->tc);
208 list_add_tail(&v->list, &vpecontrol.vpe_list);
210 INIT_LIST_HEAD(&v->notify);
215 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
216 struct tc *alloc_tc(int index)
220 if ((t = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL) {
224 INIT_LIST_HEAD(&t->tc);
225 list_add_tail(&t->list, &vpecontrol.tc_list);
232 /* clean up and free everything */
233 void release_vpe(struct vpe *v)
241 void dump_mtregs(void)
245 val = read_c0_config3();
246 printk("config3 0x%lx MT %ld\n", val,
247 (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
249 val = read_c0_mvpcontrol();
250 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
251 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
252 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
253 (val & MVPCONTROL_EVP));
255 val = read_c0_mvpconf0();
256 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
257 (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
258 val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
261 /* Find some VPE program space */
262 static void *alloc_progmem(unsigned long len)
264 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
265 /* this means you must tell linux to use less memory than you physically have */
266 return pfn_to_kaddr(max_pfn);
268 // simple grab some mem for now
269 return kmalloc(len, GFP_KERNEL);
273 static void release_progmem(void *ptr)
275 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
280 /* Update size with this section: return offset. */
281 static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
285 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
286 *size = ret + sechdr->sh_size;
290 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
291 might -- code, read-only data, read-write data, small data. Tally
292 sizes, and place the offsets into sh_entsize fields: high bit means it
294 static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
295 Elf_Shdr * sechdrs, const char *secstrings)
297 static unsigned long const masks[][2] = {
298 /* NOTE: all executable code must be the first section
299 * in this array; otherwise modify the text_size
300 * finder in the two loops below */
301 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
302 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
303 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
304 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
308 for (i = 0; i < hdr->e_shnum; i++)
309 sechdrs[i].sh_entsize = ~0UL;
311 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
312 for (i = 0; i < hdr->e_shnum; ++i) {
313 Elf_Shdr *s = &sechdrs[i];
315 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
316 if ((s->sh_flags & masks[m][0]) != masks[m][0]
317 || (s->sh_flags & masks[m][1])
318 || s->sh_entsize != ~0UL)
320 s->sh_entsize = get_offset(&mod->core_size, s);
324 mod->core_text_size = mod->core_size;
330 /* from module-elf32.c, but subverted a little */
333 struct mips_hi16 *next;
338 static struct mips_hi16 *mips_hi16_list;
339 static unsigned int gp_offs, gp_addr;
341 static int apply_r_mips_none(struct module *me, uint32_t *location,
347 static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
352 if( !(*location & 0xffff) ) {
353 rel = (int)v - gp_addr;
356 /* .sbss + gp(relative) + offset */
358 rel = (int)(short)((int)v + gp_offs +
359 (int)(short)(*location & 0xffff) - gp_addr);
362 if( (rel > 32768) || (rel < -32768) ) {
363 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
364 "relative address 0x%x out of range of gp register\n",
369 *location = (*location & 0xffff0000) | (rel & 0xffff);
374 static int apply_r_mips_pc16(struct module *me, uint32_t *location,
378 rel = (((unsigned int)v - (unsigned int)location));
379 rel >>= 2; // because the offset is in _instructions_ not bytes.
380 rel -= 1; // and one instruction less due to the branch delay slot.
382 if( (rel > 32768) || (rel < -32768) ) {
383 printk(KERN_DEBUG "VPE loader: "
384 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
388 *location = (*location & 0xffff0000) | (rel & 0xffff);
393 static int apply_r_mips_32(struct module *me, uint32_t *location,
401 static int apply_r_mips_26(struct module *me, uint32_t *location,
405 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
406 " unaligned relocation\n");
411 * Not desperately convinced this is a good check of an overflow condition
412 * anyway. But it gets in the way of handling undefined weak symbols which
413 * we want to set to zero.
414 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
416 * "module %s: relocation overflow\n",
422 *location = (*location & ~0x03ffffff) |
423 ((*location + (v >> 2)) & 0x03ffffff);
427 static int apply_r_mips_hi16(struct module *me, uint32_t *location,
433 * We cannot relocate this one now because we don't know the value of
434 * the carry we need to add. Save the information, and let LO16 do the
437 n = kmalloc(sizeof *n, GFP_KERNEL);
443 n->next = mips_hi16_list;
449 static int apply_r_mips_lo16(struct module *me, uint32_t *location,
452 unsigned long insnlo = *location;
453 Elf32_Addr val, vallo;
455 /* Sign extend the addend we extract from the lo insn. */
456 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
458 if (mips_hi16_list != NULL) {
463 struct mips_hi16 *next;
467 * The value for the HI16 had best be the same.
470 printk(KERN_DEBUG "VPE loader: "
471 "apply_r_mips_lo16/hi16: "
472 "inconsistent value information\n");
477 * Do the HI16 relocation. Note that we actually don't
478 * need to know anything about the LO16 itself, except
479 * where to find the low 16 bits of the addend needed
483 val = ((insn & 0xffff) << 16) + vallo;
487 * Account for the sign extension that will happen in
490 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
492 insn = (insn & ~0xffff) | val;
500 mips_hi16_list = NULL;
504 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
507 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
513 static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
515 [R_MIPS_NONE] = apply_r_mips_none,
516 [R_MIPS_32] = apply_r_mips_32,
517 [R_MIPS_26] = apply_r_mips_26,
518 [R_MIPS_HI16] = apply_r_mips_hi16,
519 [R_MIPS_LO16] = apply_r_mips_lo16,
520 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
521 [R_MIPS_PC16] = apply_r_mips_pc16
524 static char *rstrs[] = {
525 [R_MIPS_NONE] = "MIPS_NONE",
526 [R_MIPS_32] = "MIPS_32",
527 [R_MIPS_26] = "MIPS_26",
528 [R_MIPS_HI16] = "MIPS_HI16",
529 [R_MIPS_LO16] = "MIPS_LO16",
530 [R_MIPS_GPREL16] = "MIPS_GPREL16",
531 [R_MIPS_PC16] = "MIPS_PC16"
534 int apply_relocations(Elf32_Shdr *sechdrs,
536 unsigned int symindex,
540 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
547 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
548 Elf32_Word r_info = rel[i].r_info;
550 /* This is where to make the change */
551 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
553 /* This is the symbol it is referring to */
554 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
555 + ELF32_R_SYM(r_info);
557 if (!sym->st_value) {
558 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
559 me->name, strtab + sym->st_name);
560 /* just print the warning, dont barf */
565 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
567 char *r = rstrs[ELF32_R_TYPE(r_info)];
568 printk(KERN_WARNING "VPE loader: .text+0x%x "
569 "relocation type %s for symbol \"%s\" failed\n",
570 rel[i].r_offset, r ? r : "UNKNOWN",
571 strtab + sym->st_name);
579 void save_gp_address(unsigned int secbase, unsigned int rel)
581 gp_addr = secbase + rel;
582 gp_offs = gp_addr - (secbase & 0xffff0000);
584 /* end module-elf32.c */
588 /* Change all symbols so that sh_value encodes the pointer directly. */
589 static void simplify_symbols(Elf_Shdr * sechdrs,
590 unsigned int symindex,
592 const char *secstrings,
593 unsigned int nsecs, struct module *mod)
595 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
596 unsigned long secbase, bssbase = 0;
597 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
600 /* find the .bss section for COMMON symbols */
601 for (i = 0; i < nsecs; i++) {
602 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
603 bssbase = sechdrs[i].sh_addr;
608 for (i = 1; i < n; i++) {
609 switch (sym[i].st_shndx) {
611 /* Allocate space for the symbol in the .bss section.
612 st_value is currently size.
613 We want it to have the address of the symbol. */
615 size = sym[i].st_value;
616 sym[i].st_value = bssbase;
622 /* Don't need to do anything */
629 case SHN_MIPS_SCOMMON:
630 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON"
631 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
637 secbase = sechdrs[sym[i].st_shndx].sh_addr;
639 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
640 save_gp_address(secbase, sym[i].st_value);
643 sym[i].st_value += secbase;
649 #ifdef DEBUG_ELFLOADER
650 static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
651 const char *strtab, struct module *mod)
653 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
654 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
656 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
657 for (i = 1; i < n; i++) {
658 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
659 strtab + sym[i].st_name, sym[i].st_value);
664 static void dump_tc(struct tc *t)
669 printk(KERN_DEBUG "VPE loader: TC index %d targtc %ld "
670 "TCStatus 0x%lx halt 0x%lx\n",
671 t->index, read_c0_vpecontrol() & VPECONTROL_TARGTC,
672 read_tc_c0_tcstatus(), read_tc_c0_tchalt());
674 printk(KERN_DEBUG " tcrestart 0x%lx\n", read_tc_c0_tcrestart());
675 printk(KERN_DEBUG " tcbind 0x%lx\n", read_tc_c0_tcbind());
677 val = read_c0_vpeconf0();
678 printk(KERN_DEBUG " VPEConf0 0x%lx MVP %ld\n", val,
679 (val & VPECONF0_MVP) >> VPECONF0_MVP_SHIFT);
681 printk(KERN_DEBUG " c0 status 0x%lx\n", read_vpe_c0_status());
682 printk(KERN_DEBUG " c0 cause 0x%lx\n", read_vpe_c0_cause());
684 printk(KERN_DEBUG " c0 badvaddr 0x%lx\n", read_vpe_c0_badvaddr());
685 printk(KERN_DEBUG " c0 epc 0x%lx\n", read_vpe_c0_epc());
688 static void dump_tclist(void)
692 list_for_each_entry(t, &vpecontrol.tc_list, list) {
697 /* We are prepared so configure and start the VPE... */
698 static int vpe_run(struct vpe * v)
700 struct vpe_notifications *n;
701 unsigned long val, dmt_flag;
704 /* check we are the Master VPE */
705 val = read_c0_vpeconf0();
706 if (!(val & VPECONF0_MVP)) {
708 "VPE loader: only Master VPE's are allowed to configure MT\n");
712 /* disable MT (using dvpe) */
715 if (!list_empty(&v->tc)) {
716 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
717 printk(KERN_WARNING "VPE loader: TC %d is already in use.\n",
722 printk(KERN_WARNING "VPE loader: No TC's associated with VPE %d\n",
727 /* Put MVPE's into 'configuration state' */
728 set_c0_mvpcontrol(MVPCONTROL_VPC);
732 /* should check it is halted, and not activated */
733 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
734 printk(KERN_WARNING "VPE loader: TC %d is already doing something!\n",
741 * Disable multi-threaded execution whilst we activate, clear the
742 * halt bit and bound the tc to the other VPE...
746 /* Write the address we want it to start running from in the TCPC register. */
747 write_tc_c0_tcrestart((unsigned long)v->__start);
748 write_tc_c0_tccontext((unsigned long)0);
750 * Mark the TC as activated, not interrupt exempt and not dynamically
753 val = read_tc_c0_tcstatus();
754 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
755 write_tc_c0_tcstatus(val);
757 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
760 * The sde-kit passes 'memsize' to __start in $a3, so set something
761 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
762 * DFLT_HEAP_SIZE when you compile your program
764 mttgpr(7, physical_memsize);
769 * bind the TC to VPE 1 as late as possible so we only have the final
770 * VPE registers to set up, and so an EJTAG probe can trigger on it
772 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | v->minor);
774 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
776 back_to_back_c0_hazard();
778 /* Set up the XTC bit in vpeconf0 to point at our tc */
779 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
780 | (t->index << VPECONF0_XTC_SHIFT));
782 back_to_back_c0_hazard();
784 /* enable this VPE */
785 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
787 /* clear out any left overs from a previous program */
788 write_vpe_c0_status(0);
789 write_vpe_c0_cause(0);
791 /* take system out of configuration state */
792 clear_c0_mvpcontrol(MVPCONTROL_VPC);
794 /* now safe to re-enable multi-threading */
800 list_for_each_entry(n, &v->notify, list) {
807 static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
808 unsigned int symindex, const char *strtab,
811 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
812 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
814 for (i = 1; i < n; i++) {
815 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
816 v->__start = sym[i].st_value;
819 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
820 v->shared_ptr = (void *)sym[i].st_value;
824 if ( (v->__start == 0) || (v->shared_ptr == NULL))
831 * Allocates a VPE with some program code space(the load address), copies the
832 * contents of the program (p)buffer performing relocatations/etc, free's it
835 static int vpe_elfload(struct vpe * v)
840 char *secstrings, *strtab = NULL;
841 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
842 struct module mod; // so we can re-use the relocations code
844 memset(&mod, 0, sizeof(struct module));
845 strcpy(mod.name, "VPE loader");
847 hdr = (Elf_Ehdr *) v->pbuffer;
850 /* Sanity checks against insmoding binaries or wrong arch,
852 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
853 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
854 || !elf_check_arch(hdr)
855 || hdr->e_shentsize != sizeof(*sechdrs)) {
857 "VPE loader: program wrong arch or weird elf version\n");
862 if (hdr->e_type == ET_REL)
865 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
866 printk(KERN_ERR "VPE loader: program length %u truncated\n",
872 /* Convenience variables */
873 sechdrs = (void *)hdr + hdr->e_shoff;
874 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
875 sechdrs[0].sh_addr = 0;
877 /* And these should exist, but gcc whinges if we don't init them */
878 symindex = strindex = 0;
881 for (i = 1; i < hdr->e_shnum; i++) {
882 if (sechdrs[i].sh_type != SHT_NOBITS
883 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
884 printk(KERN_ERR "VPE program length %u truncated\n",
889 /* Mark all sections sh_addr with their address in the
891 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
893 /* Internal symbols and strings. */
894 if (sechdrs[i].sh_type == SHT_SYMTAB) {
896 strindex = sechdrs[i].sh_link;
897 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
900 layout_sections(&mod, hdr, sechdrs, secstrings);
903 v->load_addr = alloc_progmem(mod.core_size);
904 memset(v->load_addr, 0, mod.core_size);
906 printk("VPE loader: loading to %p\n", v->load_addr);
909 for (i = 0; i < hdr->e_shnum; i++) {
912 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
915 dest = v->load_addr + sechdrs[i].sh_entsize;
917 if (sechdrs[i].sh_type != SHT_NOBITS)
918 memcpy(dest, (void *)sechdrs[i].sh_addr,
920 /* Update sh_addr to point to copy in image. */
921 sechdrs[i].sh_addr = (unsigned long)dest;
923 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
924 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
927 /* Fix up syms, so that st_value is a pointer to location. */
928 simplify_symbols(sechdrs, symindex, strtab, secstrings,
931 /* Now do relocations. */
932 for (i = 1; i < hdr->e_shnum; i++) {
933 const char *strtab = (char *)sechdrs[strindex].sh_addr;
934 unsigned int info = sechdrs[i].sh_info;
936 /* Not a valid relocation section? */
937 if (info >= hdr->e_shnum)
940 /* Don't bother with non-allocated sections */
941 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
944 if (sechdrs[i].sh_type == SHT_REL)
945 err = apply_relocations(sechdrs, strtab, symindex, i,
947 else if (sechdrs[i].sh_type == SHT_RELA)
948 err = apply_relocate_add(sechdrs, strtab, symindex, i,
955 for (i = 0; i < hdr->e_shnum; i++) {
957 /* Internal symbols and strings. */
958 if (sechdrs[i].sh_type == SHT_SYMTAB) {
960 strindex = sechdrs[i].sh_link;
961 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
963 /* mark the symtab's address for when we try to find the
965 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
968 /* filter sections we dont want in the final image */
969 if (!(sechdrs[i].sh_flags & SHF_ALLOC) ||
970 (sechdrs[i].sh_type == SHT_MIPS_REGINFO)) {
971 printk( KERN_DEBUG " ignoring section, "
972 "name %s type %x address 0x%x \n",
973 secstrings + sechdrs[i].sh_name,
974 sechdrs[i].sh_type, sechdrs[i].sh_addr);
978 if (sechdrs[i].sh_addr < (unsigned int)v->load_addr) {
979 printk( KERN_WARNING "VPE loader: "
980 "fully linked image has invalid section, "
981 "name %s type %x address 0x%x, before load "
983 secstrings + sechdrs[i].sh_name,
984 sechdrs[i].sh_type, sechdrs[i].sh_addr,
985 (unsigned int)v->load_addr);
989 printk(KERN_DEBUG " copying section sh_name %s, sh_addr 0x%x "
990 "size 0x%x0 from x%p\n",
991 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr,
992 sechdrs[i].sh_size, hdr + sechdrs[i].sh_offset);
994 if (sechdrs[i].sh_type != SHT_NOBITS)
995 memcpy((void *)sechdrs[i].sh_addr,
996 (char *)hdr + sechdrs[i].sh_offset,
999 memset((void *)sechdrs[i].sh_addr, 0, sechdrs[i].sh_size);
1003 /* make sure it's physically written out */
1004 flush_icache_range((unsigned long)v->load_addr,
1005 (unsigned long)v->load_addr + v->len);
1007 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
1008 if (v->__start == 0) {
1009 printk(KERN_WARNING "VPE loader: program does not contain "
1010 "a __start symbol\n");
1014 if (v->shared_ptr == NULL)
1015 printk(KERN_WARNING "VPE loader: "
1016 "program does not contain vpe_shared symbol.\n"
1017 " Unable to use AMVP (AP/SP) facilities.\n");
1020 printk(" elf loaded\n");
1024 __attribute_used__ void dump_vpe(struct vpe * v)
1030 printk(KERN_DEBUG "VPEControl 0x%lx\n", read_vpe_c0_vpecontrol());
1031 printk(KERN_DEBUG "VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0());
1033 list_for_each_entry(t, &vpecontrol.tc_list, list)
1037 static void cleanup_tc(struct tc *tc)
1041 /* Put MVPE's into 'configuration state' */
1042 set_c0_mvpcontrol(MVPCONTROL_VPC);
1045 tmp = read_tc_c0_tcstatus();
1047 /* mark not allocated and not dynamically allocatable */
1048 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1049 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1050 write_tc_c0_tcstatus(tmp);
1052 write_tc_c0_tchalt(TCHALT_H);
1054 /* bind it to anything other than VPE1 */
1055 write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1057 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1060 static int getcwd(char *buff, int size)
1062 mm_segment_t old_fs;
1068 ret = sys_getcwd(buff,size);
1075 /* checks VPE is unused and gets ready to load program */
1076 static int vpe_open(struct inode *inode, struct file *filp)
1080 struct vpe_notifications *not;
1082 /* assume only 1 device at the mo. */
1083 if ((minor = iminor(inode)) != 1) {
1084 printk(KERN_WARNING "VPE loader: only vpe1 is supported\n");
1088 if ((v = get_vpe(minor)) == NULL) {
1089 printk(KERN_WARNING "VPE loader: unable to get vpe\n");
1093 if (v->state != VPE_STATE_UNUSED) {
1096 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1098 dump_tc(get_tc(minor));
1100 list_for_each_entry(not, &v->notify, list) {
1104 release_progmem(v->load_addr);
1105 cleanup_tc(get_tc(minor));
1108 // allocate it so when we get write ops we know it's expected.
1109 v->state = VPE_STATE_INUSE;
1111 /* this of-course trashes what was there before... */
1112 v->pbuffer = vmalloc(P_SIZE);
1114 v->load_addr = NULL;
1117 v->uid = filp->f_uid;
1118 v->gid = filp->f_gid;
1120 #ifdef CONFIG_MIPS_APSP_KSPD
1121 /* get kspd to tell us when a syscall_exit happens */
1122 if (!kspd_events_reqd) {
1123 kspd_notify(&kspd_events);
1129 ret = getcwd(v->cwd, VPE_PATH_MAX);
1131 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1133 v->shared_ptr = NULL;
1138 static int vpe_release(struct inode *inode, struct file *filp)
1144 minor = iminor(inode);
1145 if ((v = get_vpe(minor)) == NULL)
1148 // simple case of fire and forget, so tell the VPE to run...
1150 hdr = (Elf_Ehdr *) v->pbuffer;
1151 if (memcmp(hdr->e_ident, ELFMAG, 4) == 0) {
1152 if (vpe_elfload(v) >= 0)
1155 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1159 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1163 /* It's good to be able to run the SP and if it chokes have a look at
1164 the /dev/rt?. But if we reset the pointer to the shared struct we
1165 loose what has happened. So perhaps if garbage is sent to the vpe
1166 device, use it as a trigger for the reset. Hopefully a nice
1167 executable will be along shortly. */
1169 v->shared_ptr = NULL;
1171 // cleanup any temp buffers
1178 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1179 size_t count, loff_t * ppos)
1185 minor = iminor(file->f_path.dentry->d_inode);
1186 if ((v = get_vpe(minor)) == NULL)
1189 if (v->pbuffer == NULL) {
1190 printk(KERN_ERR "VPE loader: no buffer for program\n");
1194 if ((count + v->len) > v->plen) {
1196 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1200 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1208 static struct file_operations vpe_fops = {
1209 .owner = THIS_MODULE,
1211 .release = vpe_release,
1215 /* module wrapper entry points */
1217 vpe_handle vpe_alloc(void)
1223 for (i = 1; i < MAX_VPES; i++) {
1224 if ((v = get_vpe(i)) != NULL) {
1225 v->state = VPE_STATE_INUSE;
1232 EXPORT_SYMBOL(vpe_alloc);
1234 /* start running from here */
1235 int vpe_start(vpe_handle vpe, unsigned long start)
1237 struct vpe *v = vpe;
1243 EXPORT_SYMBOL(vpe_start);
1245 /* halt it for now */
1246 int vpe_stop(vpe_handle vpe)
1248 struct vpe *v = vpe;
1250 unsigned int evpe_flags;
1252 evpe_flags = dvpe();
1254 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1257 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1265 EXPORT_SYMBOL(vpe_stop);
1267 /* I've done with it thank you */
1268 int vpe_free(vpe_handle vpe)
1270 struct vpe *v = vpe;
1272 unsigned int evpe_flags;
1274 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1278 evpe_flags = dvpe();
1280 /* Put MVPE's into 'configuration state' */
1281 set_c0_mvpcontrol(MVPCONTROL_VPC);
1284 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1286 /* mark the TC unallocated and halt'ed */
1287 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1288 write_tc_c0_tchalt(TCHALT_H);
1290 v->state = VPE_STATE_UNUSED;
1292 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1298 EXPORT_SYMBOL(vpe_free);
1300 void *vpe_get_shared(int index)
1304 if ((v = get_vpe(index)) == NULL)
1307 return v->shared_ptr;
1310 EXPORT_SYMBOL(vpe_get_shared);
1312 int vpe_getuid(int index)
1316 if ((v = get_vpe(index)) == NULL)
1322 EXPORT_SYMBOL(vpe_getuid);
1324 int vpe_getgid(int index)
1328 if ((v = get_vpe(index)) == NULL)
1334 EXPORT_SYMBOL(vpe_getgid);
1336 int vpe_notify(int index, struct vpe_notifications *notify)
1340 if ((v = get_vpe(index)) == NULL)
1343 list_add(¬ify->list, &v->notify);
1347 EXPORT_SYMBOL(vpe_notify);
1349 char *vpe_getcwd(int index)
1353 if ((v = get_vpe(index)) == NULL)
1359 EXPORT_SYMBOL(vpe_getcwd);
1361 #ifdef CONFIG_MIPS_APSP_KSPD
1362 static void kspd_sp_exit( int sp_id)
1364 cleanup_tc(get_tc(sp_id));
1368 static int __init vpe_module_init(void)
1370 struct vpe *v = NULL;
1375 if (!cpu_has_mipsmt) {
1376 printk("VPE loader: not a MIPS MT capable processor\n");
1380 major = register_chrdev(0, module_name, &vpe_fops);
1382 printk("VPE loader: unable to register character device\n");
1389 /* Put MVPE's into 'configuration state' */
1390 set_c0_mvpcontrol(MVPCONTROL_VPC);
1392 /* dump_mtregs(); */
1395 val = read_c0_mvpconf0();
1396 for (i = 0; i < ((val & MVPCONF0_PTC) + 1); i++) {
1400 if (i < ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1) {
1403 if ((v = alloc_vpe(i)) == NULL) {
1404 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1408 /* add the tc to the list of this vpe's tc's. */
1409 list_add(&t->tc, &v->tc);
1411 /* deactivate all but vpe0 */
1413 unsigned long tmp = read_vpe_c0_vpeconf0();
1415 tmp &= ~VPECONF0_VPA;
1418 tmp |= VPECONF0_MVP;
1419 write_vpe_c0_vpeconf0(tmp);
1422 /* disable multi-threading with TC's */
1423 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1426 write_vpe_c0_status((read_c0_status() &
1427 ~(ST0_IM | ST0_IE | ST0_KSU))
1431 * Set config to be the same as vpe0,
1432 * particularly kseg0 coherency alg
1434 write_vpe_c0_config(read_c0_config());
1439 t->pvpe = v; /* set the parent vpe */
1446 /* Any TC that is bound to VPE0 gets left as is - in case
1447 we are running SMTC on VPE0. A TC that is bound to any
1448 other VPE gets bound to VPE0, ideally I'd like to make
1449 it homeless but it doesn't appear to let me bind a TC
1450 to a non-existent VPE. Which is perfectly reasonable.
1452 The (un)bound state is visible to an EJTAG probe so may
1456 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1457 /* tc is bound >vpe0 */
1458 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1460 t->pvpe = get_vpe(0); /* set the parent vpe */
1463 tmp = read_tc_c0_tcstatus();
1465 /* mark not activated and not dynamically allocatable */
1466 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1467 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1468 write_tc_c0_tcstatus(tmp);
1470 write_tc_c0_tchalt(TCHALT_H);
1474 /* release config state */
1475 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1477 #ifdef CONFIG_MIPS_APSP_KSPD
1478 kspd_events.kspd_sp_exit = kspd_sp_exit;
1483 static void __exit vpe_module_exit(void)
1487 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1488 if (v->state != VPE_STATE_UNUSED) {
1493 unregister_chrdev(major, module_name);
1496 module_init(vpe_module_init);
1497 module_exit(vpe_module_exit);
1498 MODULE_DESCRIPTION("MIPS VPE Loader");
1499 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1500 MODULE_LICENSE("GPL");