2 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
4 * This program is free software; you can distribute it and/or modify it
5 * under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
21 * Provides support for loading a MIPS SP program on VPE1.
22 * The SP enviroment is rather simple, no tlb's. It needs to be relocatable
23 * (or partially linked). You should initialise your stack in the startup
24 * code. This loader looks for the symbol __start and sets up
25 * execution to resume from there. The MIPS SDE kit contains suitable examples.
27 * To load and run, simply cat a SP 'program file' to /dev/vpe1.
28 * i.e cat spapp >/dev/vpe1.
30 #include <linux/kernel.h>
31 #include <linux/device.h>
32 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <asm/uaccess.h>
36 #include <linux/slab.h>
37 #include <linux/list.h>
38 #include <linux/vmalloc.h>
39 #include <linux/elf.h>
40 #include <linux/seq_file.h>
41 #include <linux/syscalls.h>
42 #include <linux/moduleloader.h>
43 #include <linux/interrupt.h>
44 #include <linux/poll.h>
45 #include <linux/bootmem.h>
46 #include <asm/mipsregs.h>
47 #include <asm/mipsmtregs.h>
48 #include <asm/cacheflush.h>
49 #include <asm/atomic.h>
51 #include <asm/mips_mt.h>
52 #include <asm/processor.h>
53 #include <asm/system.h>
56 #include <asm/mips_mt.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))
68 * The number of TCs and VPEs physically available on the core
70 static int hw_tcs, hw_vpes;
71 static char module_name[] = "vpe";
73 static const int minor = 1; /* fixed for now */
75 #ifdef CONFIG_MIPS_APSP_KSPD
76 static struct kspd_notifications kspd_events;
77 static int kspd_events_reqd = 0;
80 /* grab the likely amount of memory we will need. */
81 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
82 #define P_SIZE (2 * 1024 * 1024)
84 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
85 #define P_SIZE (256 * 1024)
88 extern unsigned long physical_memsize;
91 #define VPE_PATH_MAX 256
107 enum vpe_state state;
109 /* (device) minor associated with this vpe */
112 /* elfloader stuff */
117 unsigned int uid, gid;
118 char cwd[VPE_PATH_MAX];
120 unsigned long __start;
122 /* tc's associated with this vpe */
125 /* The list of vpe's */
126 struct list_head list;
128 /* shared symbol address */
131 /* the list of who wants to know when something major happens */
132 struct list_head notify;
141 struct vpe *pvpe; /* parent VPE */
142 struct list_head tc; /* The list of TC's with this VPE */
143 struct list_head list; /* The global list of tc's */
147 /* Virtual processing elements */
148 struct list_head vpe_list;
150 /* Thread contexts */
151 struct list_head tc_list;
153 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
154 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
157 static void release_progmem(void *ptr);
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 ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
226 INIT_LIST_HEAD(&tc->tc);
228 list_add_tail(&tc->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 /* We are prepared so configure and start the VPE... */
667 static int vpe_run(struct vpe * v)
669 unsigned long flags, val, dmt_flag;
670 struct vpe_notifications *n;
671 unsigned int vpeflags;
674 /* check we are the Master VPE */
675 local_irq_save(flags);
676 val = read_c0_vpeconf0();
677 if (!(val & VPECONF0_MVP)) {
679 "VPE loader: only Master VPE's are allowed to configure MT\n");
680 local_irq_restore(flags);
688 if (!list_empty(&v->tc)) {
689 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
692 local_irq_restore(flags);
695 "VPE loader: TC %d is already in use.\n",
702 local_irq_restore(flags);
705 "VPE loader: No TC's associated with VPE %d\n",
711 /* Put MVPE's into 'configuration state' */
712 set_c0_mvpcontrol(MVPCONTROL_VPC);
716 /* should check it is halted, and not activated */
717 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
720 local_irq_restore(flags);
722 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
728 /* Write the address we want it to start running from in the TCPC register. */
729 write_tc_c0_tcrestart((unsigned long)v->__start);
730 write_tc_c0_tccontext((unsigned long)0);
733 * Mark the TC as activated, not interrupt exempt and not dynamically
736 val = read_tc_c0_tcstatus();
737 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
738 write_tc_c0_tcstatus(val);
740 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
743 * The sde-kit passes 'memsize' to __start in $a3, so set something
744 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
745 * DFLT_HEAP_SIZE when you compile your program
748 mttgpr(7, physical_memsize);
752 * bind the TC to VPE 1 as late as possible so we only have the final
753 * VPE registers to set up, and so an EJTAG probe can trigger on it
755 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
757 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
759 back_to_back_c0_hazard();
761 /* Set up the XTC bit in vpeconf0 to point at our tc */
762 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
763 | (t->index << VPECONF0_XTC_SHIFT));
765 back_to_back_c0_hazard();
767 /* enable this VPE */
768 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
770 /* clear out any left overs from a previous program */
771 write_vpe_c0_status(0);
772 write_vpe_c0_cause(0);
774 /* take system out of configuration state */
775 clear_c0_mvpcontrol(MVPCONTROL_VPC);
783 local_irq_restore(flags);
785 list_for_each_entry(n, &v->notify, list)
791 static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
792 unsigned int symindex, const char *strtab,
795 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
796 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
798 for (i = 1; i < n; i++) {
799 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
800 v->__start = sym[i].st_value;
803 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
804 v->shared_ptr = (void *)sym[i].st_value;
808 if ( (v->__start == 0) || (v->shared_ptr == NULL))
815 * Allocates a VPE with some program code space(the load address), copies the
816 * contents of the program (p)buffer performing relocatations/etc, free's it
819 static int vpe_elfload(struct vpe * v)
824 char *secstrings, *strtab = NULL;
825 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
826 struct module mod; // so we can re-use the relocations code
828 memset(&mod, 0, sizeof(struct module));
829 strcpy(mod.name, "VPE loader");
831 hdr = (Elf_Ehdr *) v->pbuffer;
834 /* Sanity checks against insmoding binaries or wrong arch,
836 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
837 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
838 || !elf_check_arch(hdr)
839 || hdr->e_shentsize != sizeof(*sechdrs)) {
841 "VPE loader: program wrong arch or weird elf version\n");
846 if (hdr->e_type == ET_REL)
849 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
850 printk(KERN_ERR "VPE loader: program length %u truncated\n",
856 /* Convenience variables */
857 sechdrs = (void *)hdr + hdr->e_shoff;
858 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
859 sechdrs[0].sh_addr = 0;
861 /* And these should exist, but gcc whinges if we don't init them */
862 symindex = strindex = 0;
865 for (i = 1; i < hdr->e_shnum; i++) {
866 if (sechdrs[i].sh_type != SHT_NOBITS
867 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
868 printk(KERN_ERR "VPE program length %u truncated\n",
873 /* Mark all sections sh_addr with their address in the
875 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
877 /* Internal symbols and strings. */
878 if (sechdrs[i].sh_type == SHT_SYMTAB) {
880 strindex = sechdrs[i].sh_link;
881 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
884 layout_sections(&mod, hdr, sechdrs, secstrings);
887 v->load_addr = alloc_progmem(mod.core_size);
888 memset(v->load_addr, 0, mod.core_size);
890 printk("VPE loader: loading to %p\n", v->load_addr);
893 for (i = 0; i < hdr->e_shnum; i++) {
896 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
899 dest = v->load_addr + sechdrs[i].sh_entsize;
901 if (sechdrs[i].sh_type != SHT_NOBITS)
902 memcpy(dest, (void *)sechdrs[i].sh_addr,
904 /* Update sh_addr to point to copy in image. */
905 sechdrs[i].sh_addr = (unsigned long)dest;
907 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
908 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
911 /* Fix up syms, so that st_value is a pointer to location. */
912 simplify_symbols(sechdrs, symindex, strtab, secstrings,
915 /* Now do relocations. */
916 for (i = 1; i < hdr->e_shnum; i++) {
917 const char *strtab = (char *)sechdrs[strindex].sh_addr;
918 unsigned int info = sechdrs[i].sh_info;
920 /* Not a valid relocation section? */
921 if (info >= hdr->e_shnum)
924 /* Don't bother with non-allocated sections */
925 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
928 if (sechdrs[i].sh_type == SHT_REL)
929 err = apply_relocations(sechdrs, strtab, symindex, i,
931 else if (sechdrs[i].sh_type == SHT_RELA)
932 err = apply_relocate_add(sechdrs, strtab, symindex, i,
939 struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
941 for (i = 0; i < hdr->e_phnum; i++) {
942 if (phdr->p_type != PT_LOAD)
945 memcpy((void *)phdr->p_vaddr, (char *)hdr + phdr->p_offset, phdr->p_filesz);
946 memset((void *)phdr->p_vaddr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
950 for (i = 0; i < hdr->e_shnum; i++) {
951 /* Internal symbols and strings. */
952 if (sechdrs[i].sh_type == SHT_SYMTAB) {
954 strindex = sechdrs[i].sh_link;
955 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
957 /* mark the symtab's address for when we try to find the
959 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
964 /* make sure it's physically written out */
965 flush_icache_range((unsigned long)v->load_addr,
966 (unsigned long)v->load_addr + v->len);
968 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
969 if (v->__start == 0) {
970 printk(KERN_WARNING "VPE loader: program does not contain "
971 "a __start symbol\n");
975 if (v->shared_ptr == NULL)
976 printk(KERN_WARNING "VPE loader: "
977 "program does not contain vpe_shared symbol.\n"
978 " Unable to use AMVP (AP/SP) facilities.\n");
981 printk(" elf loaded\n");
985 static void cleanup_tc(struct tc *tc)
988 unsigned int mtflags, vpflags;
991 local_irq_save(flags);
994 /* Put MVPE's into 'configuration state' */
995 set_c0_mvpcontrol(MVPCONTROL_VPC);
998 tmp = read_tc_c0_tcstatus();
1000 /* mark not allocated and not dynamically allocatable */
1001 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1002 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1003 write_tc_c0_tcstatus(tmp);
1005 write_tc_c0_tchalt(TCHALT_H);
1007 /* bind it to anything other than VPE1 */
1008 // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1010 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1013 local_irq_restore(flags);
1016 static int getcwd(char *buff, int size)
1018 mm_segment_t old_fs;
1024 ret = sys_getcwd(buff, size);
1031 /* checks VPE is unused and gets ready to load program */
1032 static int vpe_open(struct inode *inode, struct file *filp)
1034 enum vpe_state state;
1035 struct vpe_notifications *not;
1039 if (minor != iminor(inode)) {
1040 /* assume only 1 device at the moment. */
1041 printk(KERN_WARNING "VPE loader: only vpe1 is supported\n");
1045 if ((v = get_vpe(tclimit)) == NULL) {
1046 printk(KERN_WARNING "VPE loader: unable to get vpe\n");
1050 state = xchg(&v->state, VPE_STATE_INUSE);
1051 if (state != VPE_STATE_UNUSED) {
1052 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1054 list_for_each_entry(not, &v->notify, list) {
1058 release_progmem(v->load_addr);
1059 cleanup_tc(get_tc(tclimit));
1062 /* this of-course trashes what was there before... */
1063 v->pbuffer = vmalloc(P_SIZE);
1065 v->load_addr = NULL;
1068 v->uid = filp->f_uid;
1069 v->gid = filp->f_gid;
1071 #ifdef CONFIG_MIPS_APSP_KSPD
1072 /* get kspd to tell us when a syscall_exit happens */
1073 if (!kspd_events_reqd) {
1074 kspd_notify(&kspd_events);
1080 ret = getcwd(v->cwd, VPE_PATH_MAX);
1082 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1084 v->shared_ptr = NULL;
1090 static int vpe_release(struct inode *inode, struct file *filp)
1096 v = get_vpe(tclimit);
1100 hdr = (Elf_Ehdr *) v->pbuffer;
1101 if (memcmp(hdr->e_ident, ELFMAG, 4) == 0) {
1102 if (vpe_elfload(v) >= 0) {
1105 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1109 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1113 /* It's good to be able to run the SP and if it chokes have a look at
1114 the /dev/rt?. But if we reset the pointer to the shared struct we
1115 loose what has happened. So perhaps if garbage is sent to the vpe
1116 device, use it as a trigger for the reset. Hopefully a nice
1117 executable will be along shortly. */
1119 v->shared_ptr = NULL;
1121 // cleanup any temp buffers
1128 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1129 size_t count, loff_t * ppos)
1134 if (iminor(file->f_path.dentry->d_inode) != minor)
1137 v = get_vpe(tclimit);
1141 if (v->pbuffer == NULL) {
1142 printk(KERN_ERR "VPE loader: no buffer for program\n");
1146 if ((count + v->len) > v->plen) {
1148 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1152 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1160 static const struct file_operations vpe_fops = {
1161 .owner = THIS_MODULE,
1163 .release = vpe_release,
1167 /* module wrapper entry points */
1169 vpe_handle vpe_alloc(void)
1175 for (i = 1; i < MAX_VPES; i++) {
1176 if ((v = get_vpe(i)) != NULL) {
1177 v->state = VPE_STATE_INUSE;
1184 EXPORT_SYMBOL(vpe_alloc);
1186 /* start running from here */
1187 int vpe_start(vpe_handle vpe, unsigned long start)
1189 struct vpe *v = vpe;
1195 EXPORT_SYMBOL(vpe_start);
1197 /* halt it for now */
1198 int vpe_stop(vpe_handle vpe)
1200 struct vpe *v = vpe;
1202 unsigned int evpe_flags;
1204 evpe_flags = dvpe();
1206 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1209 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1217 EXPORT_SYMBOL(vpe_stop);
1219 /* I've done with it thank you */
1220 int vpe_free(vpe_handle vpe)
1222 struct vpe *v = vpe;
1224 unsigned int evpe_flags;
1226 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1230 evpe_flags = dvpe();
1232 /* Put MVPE's into 'configuration state' */
1233 set_c0_mvpcontrol(MVPCONTROL_VPC);
1236 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1238 /* mark the TC unallocated and halt'ed */
1239 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1240 write_tc_c0_tchalt(TCHALT_H);
1242 v->state = VPE_STATE_UNUSED;
1244 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1250 EXPORT_SYMBOL(vpe_free);
1252 void *vpe_get_shared(int index)
1256 if ((v = get_vpe(index)) == NULL)
1259 return v->shared_ptr;
1262 EXPORT_SYMBOL(vpe_get_shared);
1264 int vpe_getuid(int index)
1268 if ((v = get_vpe(index)) == NULL)
1274 EXPORT_SYMBOL(vpe_getuid);
1276 int vpe_getgid(int index)
1280 if ((v = get_vpe(index)) == NULL)
1286 EXPORT_SYMBOL(vpe_getgid);
1288 int vpe_notify(int index, struct vpe_notifications *notify)
1292 if ((v = get_vpe(index)) == NULL)
1295 list_add(¬ify->list, &v->notify);
1299 EXPORT_SYMBOL(vpe_notify);
1301 char *vpe_getcwd(int index)
1305 if ((v = get_vpe(index)) == NULL)
1311 EXPORT_SYMBOL(vpe_getcwd);
1313 #ifdef CONFIG_MIPS_APSP_KSPD
1314 static void kspd_sp_exit( int sp_id)
1316 cleanup_tc(get_tc(sp_id));
1320 static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
1321 const char *buf, size_t len)
1323 struct vpe *vpe = get_vpe(tclimit);
1324 struct vpe_notifications *not;
1326 list_for_each_entry(not, &vpe->notify, list) {
1330 release_progmem(vpe->load_addr);
1331 cleanup_tc(get_tc(tclimit));
1338 static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr,
1341 struct vpe *vpe = get_vpe(tclimit);
1343 return sprintf(buf, "%d\n", vpe->ntcs);
1346 static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr,
1347 const char *buf, size_t len)
1349 struct vpe *vpe = get_vpe(tclimit);
1353 new = simple_strtoul(buf, &endp, 0);
1357 if (new == 0 || new > (hw_tcs - tclimit))
1368 static struct device_attribute vpe_class_attributes[] = {
1369 __ATTR(kill, S_IWUSR, NULL, store_kill),
1370 __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
1374 static void vpe_device_release(struct device *cd)
1379 struct class vpe_class = {
1381 .owner = THIS_MODULE,
1382 .dev_release = vpe_device_release,
1383 .dev_attrs = vpe_class_attributes,
1386 struct device vpe_device;
1388 static int __init vpe_module_init(void)
1390 unsigned int mtflags, vpflags;
1391 unsigned long flags, val;
1392 struct vpe *v = NULL;
1396 if (!cpu_has_mipsmt) {
1397 printk("VPE loader: not a MIPS MT capable processor\n");
1401 if (vpelimit == 0) {
1402 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1403 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1404 "kernel argument\n");
1410 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1411 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1412 "kernel argument\n");
1417 major = register_chrdev(0, module_name, &vpe_fops);
1419 printk("VPE loader: unable to register character device\n");
1423 err = class_register(&vpe_class);
1425 printk(KERN_ERR "vpe_class registration failed\n");
1429 device_initialize(&vpe_device);
1430 vpe_device.class = &vpe_class,
1431 vpe_device.parent = NULL,
1432 strlcpy(vpe_device.bus_id, "vpe1", BUS_ID_SIZE);
1433 vpe_device.devt = MKDEV(major, minor);
1434 err = device_add(&vpe_device);
1436 printk(KERN_ERR "Adding vpe_device failed\n");
1440 local_irq_save(flags);
1444 /* Put MVPE's into 'configuration state' */
1445 set_c0_mvpcontrol(MVPCONTROL_VPC);
1447 /* dump_mtregs(); */
1449 val = read_c0_mvpconf0();
1450 hw_tcs = (val & MVPCONF0_PTC) + 1;
1451 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1453 for (tc = tclimit; tc < hw_tcs; tc++) {
1455 * Must re-enable multithreading temporarily or in case we
1456 * reschedule send IPIs or similar we might hang.
1458 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1461 local_irq_restore(flags);
1468 local_irq_save(flags);
1471 set_c0_mvpcontrol(MVPCONTROL_VPC);
1477 if ((v = alloc_vpe(tc)) == NULL) {
1478 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1483 v->ntcs = hw_tcs - tclimit;
1485 /* add the tc to the list of this vpe's tc's. */
1486 list_add(&t->tc, &v->tc);
1488 /* deactivate all but vpe0 */
1489 if (tc >= tclimit) {
1490 unsigned long tmp = read_vpe_c0_vpeconf0();
1492 tmp &= ~VPECONF0_VPA;
1495 tmp |= VPECONF0_MVP;
1496 write_vpe_c0_vpeconf0(tmp);
1499 /* disable multi-threading with TC's */
1500 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1502 if (tc >= vpelimit) {
1504 * Set config to be the same as vpe0,
1505 * particularly kseg0 coherency alg
1507 write_vpe_c0_config(read_c0_config());
1512 t->pvpe = v; /* set the parent vpe */
1514 if (tc >= tclimit) {
1519 /* Any TC that is bound to VPE0 gets left as is - in case
1520 we are running SMTC on VPE0. A TC that is bound to any
1521 other VPE gets bound to VPE0, ideally I'd like to make
1522 it homeless but it doesn't appear to let me bind a TC
1523 to a non-existent VPE. Which is perfectly reasonable.
1525 The (un)bound state is visible to an EJTAG probe so may
1529 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1530 /* tc is bound >vpe0 */
1531 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1533 t->pvpe = get_vpe(0); /* set the parent vpe */
1536 tmp = read_tc_c0_tcstatus();
1538 /* mark not activated and not dynamically allocatable */
1539 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1540 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1541 write_tc_c0_tcstatus(tmp);
1543 write_tc_c0_tchalt(TCHALT_H);
1548 /* release config state */
1549 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1553 local_irq_restore(flags);
1555 #ifdef CONFIG_MIPS_APSP_KSPD
1556 kspd_events.kspd_sp_exit = kspd_sp_exit;
1561 class_unregister(&vpe_class);
1563 unregister_chrdev(major, module_name);
1569 static void __exit vpe_module_exit(void)
1573 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1574 if (v->state != VPE_STATE_UNUSED) {
1579 device_del(&vpe_device);
1580 unregister_chrdev(major, module_name);
1583 module_init(vpe_module_init);
1584 module_exit(vpe_module_exit);
1585 MODULE_DESCRIPTION("MIPS VPE Loader");
1586 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1587 MODULE_LICENSE("GPL");