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.
22 * Provides support for loading a MIPS SP program on VPE1.
23 * The SP enviroment is rather simple, no tlb's. It needs to be relocatable
24 * (or partially linked). You should initialise your stack in the startup
25 * code. This loader looks for the symbol __start and sets up
26 * execution to resume from there. The MIPS SDE kit contains suitable examples.
28 * To load and run, simply cat a SP 'program file' to /dev/vpe1.
29 * i.e cat spapp >/dev/vpe1.
31 * You'll need to have the following device files.
32 * mknod /dev/vpe0 c 63 0
33 * mknod /dev/vpe1 c 63 1
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <asm/uaccess.h>
41 #include <linux/slab.h>
42 #include <linux/list.h>
43 #include <linux/vmalloc.h>
44 #include <linux/elf.h>
45 #include <linux/seq_file.h>
46 #include <linux/syscalls.h>
47 #include <linux/moduleloader.h>
48 #include <linux/interrupt.h>
49 #include <linux/poll.h>
50 #include <linux/bootmem.h>
51 #include <asm/mipsregs.h>
52 #include <asm/mipsmtregs.h>
53 #include <asm/cacheflush.h>
54 #include <asm/atomic.h>
56 #include <asm/processor.h>
57 #include <asm/system.h>
59 typedef void *vpe_handle;
61 // defined here because the kernel module loader doesn't have
62 // anything to do with it.
63 #define SHN_MIPS_SCOMMON 0xff03
65 #ifndef ARCH_SHF_SMALL
66 #define ARCH_SHF_SMALL 0
69 /* If this is set, the section belongs in the init part of the module */
70 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
75 static char module_name[] = "vpe";
78 /* grab the likely amount of memory we will need. */
79 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
80 #define P_SIZE (2 * 1024 * 1024)
82 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
83 #define P_SIZE (256 * 1024)
109 /* The list of TC's with this VPE */
112 /* The global list of tc's */
113 struct list_head list;
117 enum vpe_state state;
119 /* (device) minor associated with this vpe */
122 /* elfloader stuff */
128 unsigned long __start;
130 /* tc's associated with this vpe */
133 /* The list of vpe's */
134 struct list_head list;
136 /* shared symbol address */
141 /* Virtual processing elements */
142 struct list_head vpe_list;
144 /* Thread contexts */
145 struct list_head tc_list;
148 static void release_progmem(void *ptr);
149 static void dump_vpe(vpe_t * v);
150 extern void save_gp_address(unsigned int secbase, unsigned int rel);
152 /* get the vpe associated with this minor */
153 struct vpe *get_vpe(int minor)
157 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
158 if (v->minor == minor)
162 printk(KERN_DEBUG "VPE: get_vpe minor %d not found\n", minor);
166 /* get the vpe associated with this minor */
167 struct tc *get_tc(int index)
171 list_for_each_entry(t, &vpecontrol.tc_list, list) {
172 if (t->index == index)
176 printk(KERN_DEBUG "VPE: get_tc index %d not found\n", index);
181 struct tc *get_tc_unused(void)
185 list_for_each_entry(t, &vpecontrol.tc_list, list) {
186 if (t->state == TC_STATE_UNUSED)
190 printk(KERN_DEBUG "VPE: All TC's are in use\n");
195 /* allocate a vpe and associate it with this minor (or index) */
196 struct vpe *alloc_vpe(int minor)
200 if ((v = kmalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) {
201 printk(KERN_WARNING "VPE: alloc_vpe no mem\n");
205 memset(v, 0, sizeof(struct vpe));
207 INIT_LIST_HEAD(&v->tc);
208 list_add_tail(&v->list, &vpecontrol.vpe_list);
214 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
215 struct tc *alloc_tc(int index)
219 if ((t = kmalloc(sizeof(struct tc), GFP_KERNEL)) == NULL) {
220 printk(KERN_WARNING "VPE: alloc_tc no mem\n");
224 memset(t, 0, sizeof(struct tc));
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_mvpconf0();
252 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
253 (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
254 val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
256 val = read_c0_mvpcontrol();
257 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
258 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
259 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
260 (val & MVPCONTROL_EVP));
262 val = read_c0_vpeconf0();
263 printk("VPEConf0 0x%lx MVP %ld\n", val,
264 (val & VPECONF0_MVP) >> VPECONF0_MVP_SHIFT);
267 /* Find some VPE program space */
268 static void *alloc_progmem(u32 len)
270 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
271 /* this means you must tell linux to use less memory than you physically have */
272 return (void *)((max_pfn * PAGE_SIZE) + KSEG0);
274 // simple grab some mem for now
275 return kmalloc(len, GFP_KERNEL);
279 static void release_progmem(void *ptr)
281 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
286 /* Update size with this section: return offset. */
287 static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
291 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
292 *size = ret + sechdr->sh_size;
296 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
297 might -- code, read-only data, read-write data, small data. Tally
298 sizes, and place the offsets into sh_entsize fields: high bit means it
300 static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
301 Elf_Shdr * sechdrs, const char *secstrings)
303 static unsigned long const masks[][2] = {
304 /* NOTE: all executable code must be the first section
305 * in this array; otherwise modify the text_size
306 * finder in the two loops below */
307 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
308 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
309 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
310 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
314 for (i = 0; i < hdr->e_shnum; i++)
315 sechdrs[i].sh_entsize = ~0UL;
317 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
318 for (i = 0; i < hdr->e_shnum; ++i) {
319 Elf_Shdr *s = &sechdrs[i];
321 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
322 if ((s->sh_flags & masks[m][0]) != masks[m][0]
323 || (s->sh_flags & masks[m][1])
324 || s->sh_entsize != ~0UL)
326 s->sh_entsize = get_offset(&mod->core_size, s);
330 mod->core_text_size = mod->core_size;
336 /* from module-elf32.c, but subverted a little */
339 struct mips_hi16 *next;
344 static struct mips_hi16 *mips_hi16_list;
345 static unsigned int gp_offs, gp_addr;
347 static int apply_r_mips_none(struct module *me, uint32_t *location,
353 static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
358 if( !(*location & 0xffff) ) {
359 rel = (int)v - gp_addr;
362 /* .sbss + gp(relative) + offset */
364 rel = (int)(short)((int)v + gp_offs +
365 (int)(short)(*location & 0xffff) - gp_addr);
368 if( (rel > 32768) || (rel < -32768) ) {
370 "apply_r_mips_gprel16: relative address out of range 0x%x %d\n",
375 *location = (*location & 0xffff0000) | (rel & 0xffff);
380 static int apply_r_mips_pc16(struct module *me, uint32_t *location,
384 rel = (((unsigned int)v - (unsigned int)location));
385 rel >>= 2; // because the offset is in _instructions_ not bytes.
386 rel -= 1; // and one instruction less due to the branch delay slot.
388 if( (rel > 32768) || (rel < -32768) ) {
390 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
394 *location = (*location & 0xffff0000) | (rel & 0xffff);
399 static int apply_r_mips_32(struct module *me, uint32_t *location,
407 static int apply_r_mips_26(struct module *me, uint32_t *location,
411 printk(KERN_ERR "module %s: dangerous relocation mod4\n", me->name);
415 /* Not desperately convinced this is a good check of an overflow condition
416 anyway. But it gets in the way of handling undefined weak symbols which
417 we want to set to zero.
418 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
420 "module %s: relocation overflow\n",
426 *location = (*location & ~0x03ffffff) |
427 ((*location + (v >> 2)) & 0x03ffffff);
431 static int apply_r_mips_hi16(struct module *me, uint32_t *location,
437 * We cannot relocate this one now because we don't know the value of
438 * the carry we need to add. Save the information, and let LO16 do the
441 n = kmalloc(sizeof *n, GFP_KERNEL);
447 n->next = mips_hi16_list;
453 static int apply_r_mips_lo16(struct module *me, uint32_t *location,
456 unsigned long insnlo = *location;
457 Elf32_Addr val, vallo;
459 /* Sign extend the addend we extract from the lo insn. */
460 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
462 if (mips_hi16_list != NULL) {
467 struct mips_hi16 *next;
471 * The value for the HI16 had best be the same.
474 printk("%d != %d\n", v, l->value);
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 printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name);
521 static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
523 [R_MIPS_NONE] = apply_r_mips_none,
524 [R_MIPS_32] = apply_r_mips_32,
525 [R_MIPS_26] = apply_r_mips_26,
526 [R_MIPS_HI16] = apply_r_mips_hi16,
527 [R_MIPS_LO16] = apply_r_mips_lo16,
528 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
529 [R_MIPS_PC16] = apply_r_mips_pc16
533 int apply_relocations(Elf32_Shdr *sechdrs,
535 unsigned int symindex,
539 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
546 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
547 Elf32_Word r_info = rel[i].r_info;
549 /* This is where to make the change */
550 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
552 /* This is the symbol it is referring to */
553 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
554 + ELF32_R_SYM(r_info);
556 if (!sym->st_value) {
557 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
558 me->name, strtab + sym->st_name);
559 /* just print the warning, dont barf */
564 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
567 "relocation error 0x%x sym refer <%s> value 0x%x "
568 "type 0x%x r_info 0x%x\n",
569 (unsigned int)location, strtab + sym->st_name, v,
570 r_info, ELF32_R_TYPE(r_info));
580 void save_gp_address(unsigned int secbase, unsigned int rel)
582 gp_addr = secbase + rel;
583 gp_offs = gp_addr - (secbase & 0xffff0000);
585 /* end module-elf32.c */
589 /* Change all symbols so that sh_value encodes the pointer directly. */
590 static int simplify_symbols(Elf_Shdr * sechdrs,
591 unsigned int symindex,
593 const char *secstrings,
594 unsigned int nsecs, struct module *mod)
596 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
597 unsigned long secbase, bssbase = 0;
598 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
601 /* find the .bss section for COMMON symbols */
602 for (i = 0; i < nsecs; i++) {
603 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0)
604 bssbase = sechdrs[i].sh_addr;
607 for (i = 1; i < n; i++) {
608 switch (sym[i].st_shndx) {
610 /* Allocate space for the symbol in the .bss section. st_value is currently size.
611 We want it to have the address of the symbol. */
613 size = sym[i].st_value;
614 sym[i].st_value = bssbase;
620 /* Don't need to do anything */
627 case SHN_MIPS_SCOMMON:
630 "simplify_symbols: ignoring SHN_MIPS_SCOMMON symbol <%s> st_shndx %d\n",
631 strtab + sym[i].st_name, sym[i].st_shndx);
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;
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)
669 printk(KERN_WARNING "VPE: TC index %d TCStatus 0x%lx halt 0x%lx\n",
670 t->index, read_tc_c0_tcstatus(), read_tc_c0_tchalt());
671 printk(KERN_WARNING "VPE: tcrestart 0x%lx\n", read_tc_c0_tcrestart());
674 static void dump_tclist(void)
678 list_for_each_entry(t, &vpecontrol.tc_list, list) {
683 /* We are prepared so configure and start the VPE... */
684 int vpe_run(vpe_t * v)
689 /* check we are the Master VPE */
690 val = read_c0_vpeconf0();
691 if (!(val & VPECONF0_MVP)) {
693 "VPE: only Master VPE's are allowed to configure MT\n");
697 /* disable MT (using dvpe) */
700 /* Put MVPE's into 'configuration state' */
701 set_c0_mvpcontrol(MVPCONTROL_VPC);
703 if (!list_empty(&v->tc)) {
704 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
705 printk(KERN_WARNING "VPE: TC %d is already in use.\n",
710 printk(KERN_WARNING "VPE: No TC's associated with VPE %d\n",
717 val = read_vpe_c0_vpeconf0();
719 /* should check it is halted, and not activated */
720 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
721 printk(KERN_WARNING "VPE: TC %d is already doing something!\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);
731 /* write the sivc_info address to tccontext */
732 write_tc_c0_tccontext((unsigned long)0);
734 /* Set up the XTC bit in vpeconf0 to point at our tc */
735 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (t->index << VPECONF0_XTC_SHIFT));
737 /* mark the TC as activated, not interrupt exempt and not dynamically allocatable */
738 val = read_tc_c0_tcstatus();
739 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
740 write_tc_c0_tcstatus(val);
742 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
745 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); // no multiple TC's
746 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); // enable this VPE
749 * The sde-kit passes 'memsize' to __start in $a3, so set something
751 * Or set $a3 (register 7) to zero and define DFLT_STACK_SIZE and
752 * DFLT_HEAP_SIZE when you compile your program
757 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
758 write_vpe_c0_config(read_c0_config());
760 /* clear out any left overs from a previous program */
761 write_vpe_c0_cause(0);
763 /* take system out of configuration state */
764 clear_c0_mvpcontrol(MVPCONTROL_VPC);
766 /* clear interrupts enabled IE, ERL, EXL, and KSU from c0 status */
767 write_vpe_c0_status(read_vpe_c0_status() & ~(ST0_ERL | ST0_KSU | ST0_IE | ST0_EXL));
775 static unsigned long find_vpe_symbols(vpe_t * v, Elf_Shdr * sechdrs,
776 unsigned int symindex, const char *strtab,
779 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
780 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
782 for (i = 1; i < n; i++) {
783 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
784 v->__start = sym[i].st_value;
787 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
788 v->shared_ptr = (void *)sym[i].st_value;
795 /* Allocates a VPE with some program code space(the load address), copies the contents
796 of the program (p)buffer performing relocatations/etc, free's it when finished.
798 int vpe_elfload(vpe_t * v)
803 char *secstrings, *strtab = NULL;
804 unsigned int len, i, symindex = 0, strindex = 0;
806 struct module mod; // so we can re-use the relocations code
808 memset(&mod, 0, sizeof(struct module));
809 strcpy(mod.name, "VPE dummy prog module");
811 hdr = (Elf_Ehdr *) v->pbuffer;
814 /* Sanity checks against insmoding binaries or wrong arch,
816 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
817 || hdr->e_type != ET_REL || !elf_check_arch(hdr)
818 || hdr->e_shentsize != sizeof(*sechdrs)) {
820 "VPE program, wrong arch or weird elf version\n");
825 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
826 printk(KERN_ERR "VPE program length %u truncated\n", len);
830 /* Convenience variables */
831 sechdrs = (void *)hdr + hdr->e_shoff;
832 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
833 sechdrs[0].sh_addr = 0;
835 /* And these should exist, but gcc whinges if we don't init them */
836 symindex = strindex = 0;
838 for (i = 1; i < hdr->e_shnum; i++) {
840 if (sechdrs[i].sh_type != SHT_NOBITS
841 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
842 printk(KERN_ERR "VPE program length %u truncated\n",
847 /* Mark all sections sh_addr with their address in the
849 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
851 /* Internal symbols and strings. */
852 if (sechdrs[i].sh_type == SHT_SYMTAB) {
854 strindex = sechdrs[i].sh_link;
855 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
859 layout_sections(&mod, hdr, sechdrs, secstrings);
861 v->load_addr = alloc_progmem(mod.core_size);
862 memset(v->load_addr, 0, mod.core_size);
864 printk("VPE elf_loader: loading to %p\n", v->load_addr);
866 for (i = 0; i < hdr->e_shnum; i++) {
869 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
872 dest = v->load_addr + sechdrs[i].sh_entsize;
874 if (sechdrs[i].sh_type != SHT_NOBITS)
875 memcpy(dest, (void *)sechdrs[i].sh_addr,
877 /* Update sh_addr to point to copy in image. */
878 sechdrs[i].sh_addr = (unsigned long)dest;
881 /* Fix up syms, so that st_value is a pointer to location. */
883 simplify_symbols(sechdrs, symindex, strtab, secstrings,
886 printk(KERN_WARNING "VPE: unable to simplify symbols\n");
890 /* Now do relocations. */
891 for (i = 1; i < hdr->e_shnum; i++) {
892 const char *strtab = (char *)sechdrs[strindex].sh_addr;
893 unsigned int info = sechdrs[i].sh_info;
895 /* Not a valid relocation section? */
896 if (info >= hdr->e_shnum)
899 /* Don't bother with non-allocated sections */
900 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
903 if (sechdrs[i].sh_type == SHT_REL)
905 apply_relocations(sechdrs, strtab, symindex, i, &mod);
906 else if (sechdrs[i].sh_type == SHT_RELA)
907 err = apply_relocate_add(sechdrs, strtab, symindex, i,
911 "vpe_elfload: error in relocations err %ld\n",
917 /* make sure it's physically written out */
918 flush_icache_range((unsigned long)v->load_addr,
919 (unsigned long)v->load_addr + v->len);
921 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
924 "VPE: program doesn't contain __start or vpe_shared symbols\n");
928 printk(" elf loaded\n");
934 static void dump_vpe(vpe_t * v)
938 printk(KERN_DEBUG "VPEControl 0x%lx\n", read_vpe_c0_vpecontrol());
939 printk(KERN_DEBUG "VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0());
941 list_for_each_entry(t, &vpecontrol.tc_list, list) {
946 /* checks for VPE is unused and gets ready to load program */
947 static int vpe_open(struct inode *inode, struct file *filp)
952 /* assume only 1 device at the mo. */
953 if ((minor = MINOR(inode->i_rdev)) != 1) {
954 printk(KERN_WARNING "VPE: only vpe1 is supported\n");
958 if ((v = get_vpe(minor)) == NULL) {
959 printk(KERN_WARNING "VPE: unable to get vpe\n");
963 if (v->state != VPE_STATE_UNUSED) {
967 printk(KERN_WARNING "VPE: device %d already in use\n", minor);
972 printk(KERN_WARNING "VPE: re-initialising %d\n", minor);
974 release_progmem(v->load_addr);
978 tmp = read_tc_c0_tcstatus();
980 /* mark not allocated and not dynamically allocatable */
981 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
982 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
983 write_tc_c0_tcstatus(tmp);
985 write_tc_c0_tchalt(TCHALT_H);
989 // allocate it so when we get write ops we know it's expected.
990 v->state = VPE_STATE_INUSE;
992 /* this of-course trashes what was there before... */
993 v->pbuffer = vmalloc(P_SIZE);
1001 static int vpe_release(struct inode *inode, struct file *filp)
1007 minor = MINOR(inode->i_rdev);
1008 if ((v = get_vpe(minor)) == NULL)
1011 // simple case of fire and forget, so tell the VPE to run...
1013 hdr = (Elf_Ehdr *) v->pbuffer;
1014 if (memcmp(hdr->e_ident, ELFMAG, 4) == 0) {
1015 if (vpe_elfload(v) >= 0)
1018 printk(KERN_WARNING "VPE: ELF load failed.\n");
1022 printk(KERN_WARNING "VPE: only elf files are supported\n");
1026 // cleanup any temp buffers
1033 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1034 size_t count, loff_t * ppos)
1040 minor = MINOR(file->f_dentry->d_inode->i_rdev);
1041 if ((v = get_vpe(minor)) == NULL)
1044 if (v->pbuffer == NULL) {
1045 printk(KERN_ERR "vpe_write: no pbuffer\n");
1049 if ((count + v->len) > v->plen) {
1051 "VPE Loader: elf size too big. Perhaps strip uneeded symbols\n");
1055 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1057 printk("vpe_write: copy_to_user failed\n");
1065 static struct file_operations vpe_fops = {
1066 .owner = THIS_MODULE,
1068 .release = vpe_release,
1072 /* module wrapper entry points */
1074 vpe_handle vpe_alloc(void)
1080 for (i = 1; i < MAX_VPES; i++) {
1081 if ((v = get_vpe(i)) != NULL) {
1082 v->state = VPE_STATE_INUSE;
1089 EXPORT_SYMBOL(vpe_alloc);
1091 /* start running from here */
1092 int vpe_start(vpe_handle vpe, unsigned long start)
1094 struct vpe *v = vpe;
1100 EXPORT_SYMBOL(vpe_start);
1102 /* halt it for now */
1103 int vpe_stop(vpe_handle vpe)
1105 struct vpe *v = vpe;
1107 unsigned int evpe_flags;
1109 evpe_flags = dvpe();
1111 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1114 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1122 EXPORT_SYMBOL(vpe_stop);
1124 /* I've done with it thank you */
1125 int vpe_free(vpe_handle vpe)
1127 struct vpe *v = vpe;
1129 unsigned int evpe_flags;
1131 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1135 evpe_flags = dvpe();
1137 /* Put MVPE's into 'configuration state' */
1138 set_c0_mvpcontrol(MVPCONTROL_VPC);
1141 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1143 /* mark the TC unallocated and halt'ed */
1144 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1145 write_tc_c0_tchalt(TCHALT_H);
1147 v->state = VPE_STATE_UNUSED;
1149 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1155 EXPORT_SYMBOL(vpe_free);
1157 void *vpe_get_shared(int index)
1161 if ((v = get_vpe(index)) == NULL) {
1162 printk(KERN_WARNING "vpe: invalid vpe index %d\n", index);
1166 return v->shared_ptr;
1169 EXPORT_SYMBOL(vpe_get_shared);
1171 static int __init vpe_module_init(void)
1173 struct vpe *v = NULL;
1178 if (!cpu_has_mipsmt) {
1179 printk("VPE loader: not a MIPS MT capable processor\n");
1183 if ((major = register_chrdev(VPE_MAJOR, module_name, &vpe_fops) < 0)) {
1184 printk("VPE loader: unable to register character device\n");
1194 /* Put MVPE's into 'configuration state' */
1195 set_c0_mvpcontrol(MVPCONTROL_VPC);
1197 /* dump_mtregs(); */
1199 INIT_LIST_HEAD(&vpecontrol.vpe_list);
1200 INIT_LIST_HEAD(&vpecontrol.tc_list);
1202 val = read_c0_mvpconf0();
1203 for (i = 0; i < ((val & MVPCONF0_PTC) + 1); i++) {
1207 if (i < ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1) {
1210 if ((v = alloc_vpe(i)) == NULL) {
1211 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1215 list_add(&t->tc, &v->tc); /* add the tc to the list of this vpe's tc's. */
1217 /* deactivate all but vpe0 */
1219 unsigned long tmp = read_vpe_c0_vpeconf0();
1221 tmp &= ~VPECONF0_VPA;
1224 tmp |= VPECONF0_MVP;
1225 write_vpe_c0_vpeconf0(tmp);
1228 /* disable multi-threading with TC's */
1229 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1232 write_vpe_c0_status((read_c0_status() &
1233 ~(ST0_IM | ST0_IE | ST0_KSU))
1236 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
1237 write_vpe_c0_config(read_c0_config());
1243 t->pvpe = v; /* set the parent vpe */
1248 /* tc 0 will of course be running.... */
1250 t->state = TC_STATE_RUNNING;
1254 /* bind a TC to each VPE, May as well put all excess TC's
1256 if (i >= (((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1))
1257 write_tc_c0_tcbind(read_tc_c0_tcbind() |
1258 ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT));
1260 write_tc_c0_tcbind(read_tc_c0_tcbind() | i);
1262 tmp = read_tc_c0_tcstatus();
1264 /* mark not allocated and not dynamically allocatable */
1265 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1266 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1267 write_tc_c0_tcstatus(tmp);
1269 write_tc_c0_tchalt(TCHALT_H);
1273 /* release config state */
1274 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1279 static void __exit vpe_module_exit(void)
1283 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1284 if (v->state != VPE_STATE_UNUSED) {
1289 unregister_chrdev(major, module_name);
1292 module_init(vpe_module_init);
1293 module_exit(vpe_module_exit);
1294 MODULE_DESCRIPTION("MIPS VPE Loader");
1295 MODULE_AUTHOR("Elizabeth Clarke, MIPS Technologies, Inc");
1296 MODULE_LICENSE("GPL");