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))
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;
135 struct vpe *pvpe; /* parent VPE */
136 struct list_head tc; /* The list of TC's with this VPE */
137 struct list_head list; /* The global list of tc's */
141 /* Virtual processing elements */
142 struct list_head vpe_list;
144 /* Thread contexts */
145 struct list_head tc_list;
147 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
148 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
151 static void release_progmem(void *ptr);
152 extern void save_gp_address(unsigned int secbase, unsigned int rel);
154 /* get the vpe associated with this minor */
155 struct vpe *get_vpe(int minor)
162 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
163 if (v->minor == minor)
170 /* get the vpe associated with this minor */
171 struct tc *get_tc(int index)
175 list_for_each_entry(t, &vpecontrol.tc_list, list) {
176 if (t->index == index)
183 struct tc *get_tc_unused(void)
187 list_for_each_entry(t, &vpecontrol.tc_list, list) {
188 if (t->state == TC_STATE_UNUSED)
195 /* allocate a vpe and associate it with this minor (or index) */
196 struct vpe *alloc_vpe(int minor)
200 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) {
204 INIT_LIST_HEAD(&v->tc);
205 list_add_tail(&v->list, &vpecontrol.vpe_list);
207 INIT_LIST_HEAD(&v->notify);
212 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
213 struct tc *alloc_tc(int index)
217 if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
220 INIT_LIST_HEAD(&tc->tc);
222 list_add_tail(&tc->list, &vpecontrol.tc_list);
228 /* clean up and free everything */
229 void release_vpe(struct vpe *v)
237 void dump_mtregs(void)
241 val = read_c0_config3();
242 printk("config3 0x%lx MT %ld\n", val,
243 (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
245 val = read_c0_mvpcontrol();
246 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
247 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
248 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
249 (val & MVPCONTROL_EVP));
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);
257 /* Find some VPE program space */
258 static void *alloc_progmem(unsigned long len)
260 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
261 /* this means you must tell linux to use less memory than you physically have */
262 return pfn_to_kaddr(max_pfn);
264 // simple grab some mem for now
265 return kmalloc(len, GFP_KERNEL);
269 static void release_progmem(void *ptr)
271 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
276 /* Update size with this section: return offset. */
277 static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
281 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
282 *size = ret + sechdr->sh_size;
286 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
287 might -- code, read-only data, read-write data, small data. Tally
288 sizes, and place the offsets into sh_entsize fields: high bit means it
290 static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
291 Elf_Shdr * sechdrs, const char *secstrings)
293 static unsigned long const masks[][2] = {
294 /* NOTE: all executable code must be the first section
295 * in this array; otherwise modify the text_size
296 * finder in the two loops below */
297 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
298 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
299 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
300 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
304 for (i = 0; i < hdr->e_shnum; i++)
305 sechdrs[i].sh_entsize = ~0UL;
307 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
308 for (i = 0; i < hdr->e_shnum; ++i) {
309 Elf_Shdr *s = &sechdrs[i];
311 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
312 if ((s->sh_flags & masks[m][0]) != masks[m][0]
313 || (s->sh_flags & masks[m][1])
314 || s->sh_entsize != ~0UL)
316 s->sh_entsize = get_offset(&mod->core_size, s);
320 mod->core_text_size = mod->core_size;
326 /* from module-elf32.c, but subverted a little */
329 struct mips_hi16 *next;
334 static struct mips_hi16 *mips_hi16_list;
335 static unsigned int gp_offs, gp_addr;
337 static int apply_r_mips_none(struct module *me, uint32_t *location,
343 static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
348 if( !(*location & 0xffff) ) {
349 rel = (int)v - gp_addr;
352 /* .sbss + gp(relative) + offset */
354 rel = (int)(short)((int)v + gp_offs +
355 (int)(short)(*location & 0xffff) - gp_addr);
358 if( (rel > 32768) || (rel < -32768) ) {
359 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
360 "relative address 0x%x out of range of gp register\n",
365 *location = (*location & 0xffff0000) | (rel & 0xffff);
370 static int apply_r_mips_pc16(struct module *me, uint32_t *location,
374 rel = (((unsigned int)v - (unsigned int)location));
375 rel >>= 2; // because the offset is in _instructions_ not bytes.
376 rel -= 1; // and one instruction less due to the branch delay slot.
378 if( (rel > 32768) || (rel < -32768) ) {
379 printk(KERN_DEBUG "VPE loader: "
380 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
384 *location = (*location & 0xffff0000) | (rel & 0xffff);
389 static int apply_r_mips_32(struct module *me, uint32_t *location,
397 static int apply_r_mips_26(struct module *me, uint32_t *location,
401 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
402 " unaligned relocation\n");
407 * Not desperately convinced this is a good check of an overflow condition
408 * anyway. But it gets in the way of handling undefined weak symbols which
409 * we want to set to zero.
410 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
412 * "module %s: relocation overflow\n",
418 *location = (*location & ~0x03ffffff) |
419 ((*location + (v >> 2)) & 0x03ffffff);
423 static int apply_r_mips_hi16(struct module *me, uint32_t *location,
429 * We cannot relocate this one now because we don't know the value of
430 * the carry we need to add. Save the information, and let LO16 do the
433 n = kmalloc(sizeof *n, GFP_KERNEL);
439 n->next = mips_hi16_list;
445 static int apply_r_mips_lo16(struct module *me, uint32_t *location,
448 unsigned long insnlo = *location;
449 Elf32_Addr val, vallo;
451 /* Sign extend the addend we extract from the lo insn. */
452 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
454 if (mips_hi16_list != NULL) {
459 struct mips_hi16 *next;
463 * The value for the HI16 had best be the same.
466 printk(KERN_DEBUG "VPE loader: "
467 "apply_r_mips_lo16/hi16: "
468 "inconsistent value information\n");
473 * Do the HI16 relocation. Note that we actually don't
474 * need to know anything about the LO16 itself, except
475 * where to find the low 16 bits of the addend needed
479 val = ((insn & 0xffff) << 16) + vallo;
483 * Account for the sign extension that will happen in
486 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
488 insn = (insn & ~0xffff) | val;
496 mips_hi16_list = NULL;
500 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
503 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
509 static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
511 [R_MIPS_NONE] = apply_r_mips_none,
512 [R_MIPS_32] = apply_r_mips_32,
513 [R_MIPS_26] = apply_r_mips_26,
514 [R_MIPS_HI16] = apply_r_mips_hi16,
515 [R_MIPS_LO16] = apply_r_mips_lo16,
516 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
517 [R_MIPS_PC16] = apply_r_mips_pc16
520 static char *rstrs[] = {
521 [R_MIPS_NONE] = "MIPS_NONE",
522 [R_MIPS_32] = "MIPS_32",
523 [R_MIPS_26] = "MIPS_26",
524 [R_MIPS_HI16] = "MIPS_HI16",
525 [R_MIPS_LO16] = "MIPS_LO16",
526 [R_MIPS_GPREL16] = "MIPS_GPREL16",
527 [R_MIPS_PC16] = "MIPS_PC16"
530 int apply_relocations(Elf32_Shdr *sechdrs,
532 unsigned int symindex,
536 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
543 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
544 Elf32_Word r_info = rel[i].r_info;
546 /* This is where to make the change */
547 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
549 /* This is the symbol it is referring to */
550 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
551 + ELF32_R_SYM(r_info);
553 if (!sym->st_value) {
554 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
555 me->name, strtab + sym->st_name);
556 /* just print the warning, dont barf */
561 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
563 char *r = rstrs[ELF32_R_TYPE(r_info)];
564 printk(KERN_WARNING "VPE loader: .text+0x%x "
565 "relocation type %s for symbol \"%s\" failed\n",
566 rel[i].r_offset, r ? r : "UNKNOWN",
567 strtab + sym->st_name);
575 void save_gp_address(unsigned int secbase, unsigned int rel)
577 gp_addr = secbase + rel;
578 gp_offs = gp_addr - (secbase & 0xffff0000);
580 /* end module-elf32.c */
584 /* Change all symbols so that sh_value encodes the pointer directly. */
585 static void simplify_symbols(Elf_Shdr * sechdrs,
586 unsigned int symindex,
588 const char *secstrings,
589 unsigned int nsecs, struct module *mod)
591 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
592 unsigned long secbase, bssbase = 0;
593 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
596 /* find the .bss section for COMMON symbols */
597 for (i = 0; i < nsecs; i++) {
598 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
599 bssbase = sechdrs[i].sh_addr;
604 for (i = 1; i < n; i++) {
605 switch (sym[i].st_shndx) {
607 /* Allocate space for the symbol in the .bss section.
608 st_value is currently size.
609 We want it to have the address of the symbol. */
611 size = sym[i].st_value;
612 sym[i].st_value = bssbase;
618 /* Don't need to do anything */
625 case SHN_MIPS_SCOMMON:
626 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON"
627 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
633 secbase = sechdrs[sym[i].st_shndx].sh_addr;
635 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
636 save_gp_address(secbase, sym[i].st_value);
639 sym[i].st_value += secbase;
645 #ifdef DEBUG_ELFLOADER
646 static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
647 const char *strtab, struct module *mod)
649 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
650 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
652 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
653 for (i = 1; i < n; i++) {
654 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
655 strtab + sym[i].st_name, sym[i].st_value);
660 /* We are prepared so configure and start the VPE... */
661 static int vpe_run(struct vpe * v)
663 unsigned long flags, val, dmt_flag;
664 struct vpe_notifications *n;
665 unsigned int vpeflags;
668 /* check we are the Master VPE */
669 local_irq_save(flags);
670 val = read_c0_vpeconf0();
671 if (!(val & VPECONF0_MVP)) {
673 "VPE loader: only Master VPE's are allowed to configure MT\n");
674 local_irq_restore(flags);
682 if (!list_empty(&v->tc)) {
683 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
686 local_irq_restore(flags);
689 "VPE loader: TC %d is already in use.\n",
696 local_irq_restore(flags);
699 "VPE loader: No TC's associated with VPE %d\n",
705 /* Put MVPE's into 'configuration state' */
706 set_c0_mvpcontrol(MVPCONTROL_VPC);
710 /* should check it is halted, and not activated */
711 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
714 local_irq_restore(flags);
716 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
722 /* Write the address we want it to start running from in the TCPC register. */
723 write_tc_c0_tcrestart((unsigned long)v->__start);
724 write_tc_c0_tccontext((unsigned long)0);
727 * Mark the TC as activated, not interrupt exempt and not dynamically
730 val = read_tc_c0_tcstatus();
731 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
732 write_tc_c0_tcstatus(val);
734 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
737 * The sde-kit passes 'memsize' to __start in $a3, so set something
738 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
739 * DFLT_HEAP_SIZE when you compile your program
741 mttgpr(7, physical_memsize);
745 * bind the TC to VPE 1 as late as possible so we only have the final
746 * VPE registers to set up, and so an EJTAG probe can trigger on it
748 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
750 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
752 back_to_back_c0_hazard();
754 /* Set up the XTC bit in vpeconf0 to point at our tc */
755 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
756 | (t->index << VPECONF0_XTC_SHIFT));
758 back_to_back_c0_hazard();
760 /* enable this VPE */
761 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
763 /* clear out any left overs from a previous program */
764 write_vpe_c0_status(0);
765 write_vpe_c0_cause(0);
767 /* take system out of configuration state */
768 clear_c0_mvpcontrol(MVPCONTROL_VPC);
776 local_irq_restore(flags);
778 list_for_each_entry(n, &v->notify, list)
784 static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
785 unsigned int symindex, const char *strtab,
788 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
789 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
791 for (i = 1; i < n; i++) {
792 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
793 v->__start = sym[i].st_value;
796 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
797 v->shared_ptr = (void *)sym[i].st_value;
801 if ( (v->__start == 0) || (v->shared_ptr == NULL))
808 * Allocates a VPE with some program code space(the load address), copies the
809 * contents of the program (p)buffer performing relocatations/etc, free's it
812 static int vpe_elfload(struct vpe * v)
817 char *secstrings, *strtab = NULL;
818 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
819 struct module mod; // so we can re-use the relocations code
821 memset(&mod, 0, sizeof(struct module));
822 strcpy(mod.name, "VPE loader");
824 hdr = (Elf_Ehdr *) v->pbuffer;
827 /* Sanity checks against insmoding binaries or wrong arch,
829 if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
830 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
831 || !elf_check_arch(hdr)
832 || hdr->e_shentsize != sizeof(*sechdrs)) {
834 "VPE loader: program wrong arch or weird elf version\n");
839 if (hdr->e_type == ET_REL)
842 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
843 printk(KERN_ERR "VPE loader: program length %u truncated\n",
849 /* Convenience variables */
850 sechdrs = (void *)hdr + hdr->e_shoff;
851 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
852 sechdrs[0].sh_addr = 0;
854 /* And these should exist, but gcc whinges if we don't init them */
855 symindex = strindex = 0;
858 for (i = 1; i < hdr->e_shnum; i++) {
859 if (sechdrs[i].sh_type != SHT_NOBITS
860 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
861 printk(KERN_ERR "VPE program length %u truncated\n",
866 /* Mark all sections sh_addr with their address in the
868 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
870 /* Internal symbols and strings. */
871 if (sechdrs[i].sh_type == SHT_SYMTAB) {
873 strindex = sechdrs[i].sh_link;
874 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
877 layout_sections(&mod, hdr, sechdrs, secstrings);
880 v->load_addr = alloc_progmem(mod.core_size);
881 memset(v->load_addr, 0, mod.core_size);
883 printk("VPE loader: loading to %p\n", v->load_addr);
886 for (i = 0; i < hdr->e_shnum; i++) {
889 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
892 dest = v->load_addr + sechdrs[i].sh_entsize;
894 if (sechdrs[i].sh_type != SHT_NOBITS)
895 memcpy(dest, (void *)sechdrs[i].sh_addr,
897 /* Update sh_addr to point to copy in image. */
898 sechdrs[i].sh_addr = (unsigned long)dest;
900 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
901 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
904 /* Fix up syms, so that st_value is a pointer to location. */
905 simplify_symbols(sechdrs, symindex, strtab, secstrings,
908 /* Now do relocations. */
909 for (i = 1; i < hdr->e_shnum; i++) {
910 const char *strtab = (char *)sechdrs[strindex].sh_addr;
911 unsigned int info = sechdrs[i].sh_info;
913 /* Not a valid relocation section? */
914 if (info >= hdr->e_shnum)
917 /* Don't bother with non-allocated sections */
918 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
921 if (sechdrs[i].sh_type == SHT_REL)
922 err = apply_relocations(sechdrs, strtab, symindex, i,
924 else if (sechdrs[i].sh_type == SHT_RELA)
925 err = apply_relocate_add(sechdrs, strtab, symindex, i,
932 for (i = 0; i < hdr->e_shnum; i++) {
934 /* Internal symbols and strings. */
935 if (sechdrs[i].sh_type == SHT_SYMTAB) {
937 strindex = sechdrs[i].sh_link;
938 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
940 /* mark the symtab's address for when we try to find the
942 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
945 /* filter sections we dont want in the final image */
946 if (!(sechdrs[i].sh_flags & SHF_ALLOC) ||
947 (sechdrs[i].sh_type == SHT_MIPS_REGINFO)) {
948 printk( KERN_DEBUG " ignoring section, "
949 "name %s type %x address 0x%x \n",
950 secstrings + sechdrs[i].sh_name,
951 sechdrs[i].sh_type, sechdrs[i].sh_addr);
955 if (sechdrs[i].sh_addr < (unsigned int)v->load_addr) {
956 printk( KERN_WARNING "VPE loader: "
957 "fully linked image has invalid section, "
958 "name %s type %x address 0x%x, before load "
960 secstrings + sechdrs[i].sh_name,
961 sechdrs[i].sh_type, sechdrs[i].sh_addr,
962 (unsigned int)v->load_addr);
966 printk(KERN_DEBUG " copying section sh_name %s, sh_addr 0x%x "
967 "size 0x%x0 from x%p\n",
968 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr,
969 sechdrs[i].sh_size, hdr + sechdrs[i].sh_offset);
971 if (sechdrs[i].sh_type != SHT_NOBITS)
972 memcpy((void *)sechdrs[i].sh_addr,
973 (char *)hdr + sechdrs[i].sh_offset,
976 memset((void *)sechdrs[i].sh_addr, 0, sechdrs[i].sh_size);
980 /* make sure it's physically written out */
981 flush_icache_range((unsigned long)v->load_addr,
982 (unsigned long)v->load_addr + v->len);
984 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
985 if (v->__start == 0) {
986 printk(KERN_WARNING "VPE loader: program does not contain "
987 "a __start symbol\n");
991 if (v->shared_ptr == NULL)
992 printk(KERN_WARNING "VPE loader: "
993 "program does not contain vpe_shared symbol.\n"
994 " Unable to use AMVP (AP/SP) facilities.\n");
997 printk(" elf loaded\n");
1001 static void cleanup_tc(struct tc *tc)
1003 unsigned long flags;
1004 unsigned int mtflags, vpflags;
1007 local_irq_save(flags);
1010 /* Put MVPE's into 'configuration state' */
1011 set_c0_mvpcontrol(MVPCONTROL_VPC);
1014 tmp = read_tc_c0_tcstatus();
1016 /* mark not allocated and not dynamically allocatable */
1017 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1018 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1019 write_tc_c0_tcstatus(tmp);
1021 write_tc_c0_tchalt(TCHALT_H);
1023 /* bind it to anything other than VPE1 */
1024 // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1026 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1029 local_irq_restore(flags);
1032 static int getcwd(char *buff, int size)
1034 mm_segment_t old_fs;
1040 ret = sys_getcwd(buff,size);
1047 /* checks VPE is unused and gets ready to load program */
1048 static int vpe_open(struct inode *inode, struct file *filp)
1050 enum vpe_state state;
1051 struct vpe_notifications *not;
1055 if (minor != iminor(inode)) {
1056 /* assume only 1 device at the moment. */
1057 printk(KERN_WARNING "VPE loader: only vpe1 is supported\n");
1061 if ((v = get_vpe(tclimit)) == NULL) {
1062 printk(KERN_WARNING "VPE loader: unable to get vpe\n");
1066 state = xchg(&v->state, VPE_STATE_INUSE);
1067 if (state != VPE_STATE_UNUSED) {
1068 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1070 list_for_each_entry(not, &v->notify, list) {
1074 release_progmem(v->load_addr);
1075 cleanup_tc(get_tc(tclimit));
1078 /* this of-course trashes what was there before... */
1079 v->pbuffer = vmalloc(P_SIZE);
1081 v->load_addr = NULL;
1084 v->uid = filp->f_uid;
1085 v->gid = filp->f_gid;
1087 #ifdef CONFIG_MIPS_APSP_KSPD
1088 /* get kspd to tell us when a syscall_exit happens */
1089 if (!kspd_events_reqd) {
1090 kspd_notify(&kspd_events);
1096 ret = getcwd(v->cwd, VPE_PATH_MAX);
1098 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1100 v->shared_ptr = NULL;
1106 static int vpe_release(struct inode *inode, struct file *filp)
1112 v = get_vpe(tclimit);
1116 hdr = (Elf_Ehdr *) v->pbuffer;
1117 if (memcmp(hdr->e_ident, ELFMAG, 4) == 0) {
1118 if (vpe_elfload(v) >= 0) {
1121 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1125 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1129 /* It's good to be able to run the SP and if it chokes have a look at
1130 the /dev/rt?. But if we reset the pointer to the shared struct we
1131 loose what has happened. So perhaps if garbage is sent to the vpe
1132 device, use it as a trigger for the reset. Hopefully a nice
1133 executable will be along shortly. */
1135 v->shared_ptr = NULL;
1137 // cleanup any temp buffers
1144 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1145 size_t count, loff_t * ppos)
1150 if (iminor(file->f_path.dentry->d_inode) != minor)
1153 v = get_vpe(tclimit);
1157 if (v->pbuffer == NULL) {
1158 printk(KERN_ERR "VPE loader: no buffer for program\n");
1162 if ((count + v->len) > v->plen) {
1164 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1168 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1176 static const struct file_operations vpe_fops = {
1177 .owner = THIS_MODULE,
1179 .release = vpe_release,
1183 /* module wrapper entry points */
1185 vpe_handle vpe_alloc(void)
1191 for (i = 1; i < MAX_VPES; i++) {
1192 if ((v = get_vpe(i)) != NULL) {
1193 v->state = VPE_STATE_INUSE;
1200 EXPORT_SYMBOL(vpe_alloc);
1202 /* start running from here */
1203 int vpe_start(vpe_handle vpe, unsigned long start)
1205 struct vpe *v = vpe;
1211 EXPORT_SYMBOL(vpe_start);
1213 /* halt it for now */
1214 int vpe_stop(vpe_handle vpe)
1216 struct vpe *v = vpe;
1218 unsigned int evpe_flags;
1220 evpe_flags = dvpe();
1222 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1225 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1233 EXPORT_SYMBOL(vpe_stop);
1235 /* I've done with it thank you */
1236 int vpe_free(vpe_handle vpe)
1238 struct vpe *v = vpe;
1240 unsigned int evpe_flags;
1242 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1246 evpe_flags = dvpe();
1248 /* Put MVPE's into 'configuration state' */
1249 set_c0_mvpcontrol(MVPCONTROL_VPC);
1252 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1254 /* mark the TC unallocated and halt'ed */
1255 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1256 write_tc_c0_tchalt(TCHALT_H);
1258 v->state = VPE_STATE_UNUSED;
1260 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1266 EXPORT_SYMBOL(vpe_free);
1268 void *vpe_get_shared(int index)
1272 if ((v = get_vpe(index)) == NULL)
1275 return v->shared_ptr;
1278 EXPORT_SYMBOL(vpe_get_shared);
1280 int vpe_getuid(int index)
1284 if ((v = get_vpe(index)) == NULL)
1290 EXPORT_SYMBOL(vpe_getuid);
1292 int vpe_getgid(int index)
1296 if ((v = get_vpe(index)) == NULL)
1302 EXPORT_SYMBOL(vpe_getgid);
1304 int vpe_notify(int index, struct vpe_notifications *notify)
1308 if ((v = get_vpe(index)) == NULL)
1311 list_add(¬ify->list, &v->notify);
1315 EXPORT_SYMBOL(vpe_notify);
1317 char *vpe_getcwd(int index)
1321 if ((v = get_vpe(index)) == NULL)
1327 EXPORT_SYMBOL(vpe_getcwd);
1329 #ifdef CONFIG_MIPS_APSP_KSPD
1330 static void kspd_sp_exit( int sp_id)
1332 cleanup_tc(get_tc(sp_id));
1336 static struct device *vpe_dev;
1338 static int __init vpe_module_init(void)
1340 unsigned int mtflags, vpflags;
1341 int hw_tcs, hw_vpes, tc, err = 0;
1342 unsigned long flags, val;
1343 struct vpe *v = NULL;
1347 if (!cpu_has_mipsmt) {
1348 printk("VPE loader: not a MIPS MT capable processor\n");
1352 if (vpelimit == 0) {
1353 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1354 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1355 "kernel argument\n");
1361 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1362 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1363 "kernel argument\n");
1368 major = register_chrdev(0, module_name, &vpe_fops);
1370 printk("VPE loader: unable to register character device\n");
1374 dev = device_create(mt_class, NULL, MKDEV(major, minor),
1382 local_irq_save(flags);
1386 /* Put MVPE's into 'configuration state' */
1387 set_c0_mvpcontrol(MVPCONTROL_VPC);
1389 /* dump_mtregs(); */
1391 val = read_c0_mvpconf0();
1392 hw_tcs = (val & MVPCONF0_PTC) + 1;
1393 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1395 for (tc = tclimit; tc < hw_tcs; tc++) {
1397 * Must re-enable multithreading temporarily or in case we
1398 * reschedule send IPIs or similar we might hang.
1400 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1403 local_irq_restore(flags);
1410 local_irq_save(flags);
1413 set_c0_mvpcontrol(MVPCONTROL_VPC);
1419 if ((v = alloc_vpe(tc)) == NULL) {
1420 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1425 /* add the tc to the list of this vpe's tc's. */
1426 list_add(&t->tc, &v->tc);
1428 /* deactivate all but vpe0 */
1429 if (tc >= tclimit) {
1430 unsigned long tmp = read_vpe_c0_vpeconf0();
1432 tmp &= ~VPECONF0_VPA;
1435 tmp |= VPECONF0_MVP;
1436 write_vpe_c0_vpeconf0(tmp);
1439 /* disable multi-threading with TC's */
1440 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1442 if (tc >= vpelimit) {
1444 * Set config to be the same as vpe0,
1445 * particularly kseg0 coherency alg
1447 write_vpe_c0_config(read_c0_config());
1452 t->pvpe = v; /* set the parent vpe */
1454 if (tc >= tclimit) {
1459 /* Any TC that is bound to VPE0 gets left as is - in case
1460 we are running SMTC on VPE0. A TC that is bound to any
1461 other VPE gets bound to VPE0, ideally I'd like to make
1462 it homeless but it doesn't appear to let me bind a TC
1463 to a non-existent VPE. Which is perfectly reasonable.
1465 The (un)bound state is visible to an EJTAG probe so may
1469 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1470 /* tc is bound >vpe0 */
1471 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1473 t->pvpe = get_vpe(0); /* set the parent vpe */
1476 tmp = read_tc_c0_tcstatus();
1478 /* mark not activated and not dynamically allocatable */
1479 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1480 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1481 write_tc_c0_tcstatus(tmp);
1483 write_tc_c0_tchalt(TCHALT_H);
1488 /* release config state */
1489 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1493 local_irq_restore(flags);
1495 #ifdef CONFIG_MIPS_APSP_KSPD
1496 kspd_events.kspd_sp_exit = kspd_sp_exit;
1501 unregister_chrdev(major, module_name);
1507 static void __exit vpe_module_exit(void)
1511 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1512 if (v->state != VPE_STATE_UNUSED) {
1517 device_destroy(mt_class, MKDEV(major, minor));
1518 unregister_chrdev(major, module_name);
1521 module_init(vpe_module_init);
1522 module_exit(vpe_module_exit);
1523 MODULE_DESCRIPTION("MIPS VPE Loader");
1524 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1525 MODULE_LICENSE("GPL");