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/smp_lock.h>
42 #include <linux/syscalls.h>
43 #include <linux/moduleloader.h>
44 #include <linux/interrupt.h>
45 #include <linux/poll.h>
46 #include <linux/bootmem.h>
47 #include <asm/mipsregs.h>
48 #include <asm/mipsmtregs.h>
49 #include <asm/cacheflush.h>
50 #include <asm/atomic.h>
52 #include <asm/mips_mt.h>
53 #include <asm/processor.h>
54 #include <asm/system.h>
58 typedef void *vpe_handle;
60 #ifndef ARCH_SHF_SMALL
61 #define ARCH_SHF_SMALL 0
64 /* If this is set, the section belongs in the init part of the module */
65 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
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)
268 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
270 * This means you must tell Linux to use less memory than you
271 * physically have, for example by passing a mem= boot argument.
273 addr = pfn_to_kaddr(max_low_pfn);
274 memset(addr, 0, len);
276 /* simple grab some mem for now */
277 addr = kzalloc(len, GFP_KERNEL);
283 static void release_progmem(void *ptr)
285 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
290 /* Update size with this section: return offset. */
291 static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
295 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
296 *size = ret + sechdr->sh_size;
300 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
301 might -- code, read-only data, read-write data, small data. Tally
302 sizes, and place the offsets into sh_entsize fields: high bit means it
304 static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
305 Elf_Shdr * sechdrs, const char *secstrings)
307 static unsigned long const masks[][2] = {
308 /* NOTE: all executable code must be the first section
309 * in this array; otherwise modify the text_size
310 * finder in the two loops below */
311 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
312 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
313 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
314 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
318 for (i = 0; i < hdr->e_shnum; i++)
319 sechdrs[i].sh_entsize = ~0UL;
321 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
322 for (i = 0; i < hdr->e_shnum; ++i) {
323 Elf_Shdr *s = &sechdrs[i];
325 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
326 if ((s->sh_flags & masks[m][0]) != masks[m][0]
327 || (s->sh_flags & masks[m][1])
328 || s->sh_entsize != ~0UL)
330 s->sh_entsize = get_offset(&mod->core_size, s);
334 mod->core_text_size = mod->core_size;
340 /* from module-elf32.c, but subverted a little */
343 struct mips_hi16 *next;
348 static struct mips_hi16 *mips_hi16_list;
349 static unsigned int gp_offs, gp_addr;
351 static int apply_r_mips_none(struct module *me, uint32_t *location,
357 static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
362 if( !(*location & 0xffff) ) {
363 rel = (int)v - gp_addr;
366 /* .sbss + gp(relative) + offset */
368 rel = (int)(short)((int)v + gp_offs +
369 (int)(short)(*location & 0xffff) - gp_addr);
372 if( (rel > 32768) || (rel < -32768) ) {
373 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
374 "relative address 0x%x out of range of gp register\n",
379 *location = (*location & 0xffff0000) | (rel & 0xffff);
384 static int apply_r_mips_pc16(struct module *me, uint32_t *location,
388 rel = (((unsigned int)v - (unsigned int)location));
389 rel >>= 2; // because the offset is in _instructions_ not bytes.
390 rel -= 1; // and one instruction less due to the branch delay slot.
392 if( (rel > 32768) || (rel < -32768) ) {
393 printk(KERN_DEBUG "VPE loader: "
394 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
398 *location = (*location & 0xffff0000) | (rel & 0xffff);
403 static int apply_r_mips_32(struct module *me, uint32_t *location,
411 static int apply_r_mips_26(struct module *me, uint32_t *location,
415 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
416 " unaligned relocation\n");
421 * Not desperately convinced this is a good check of an overflow condition
422 * anyway. But it gets in the way of handling undefined weak symbols which
423 * we want to set to zero.
424 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
426 * "module %s: relocation overflow\n",
432 *location = (*location & ~0x03ffffff) |
433 ((*location + (v >> 2)) & 0x03ffffff);
437 static int apply_r_mips_hi16(struct module *me, uint32_t *location,
443 * We cannot relocate this one now because we don't know the value of
444 * the carry we need to add. Save the information, and let LO16 do the
447 n = kmalloc(sizeof *n, GFP_KERNEL);
453 n->next = mips_hi16_list;
459 static int apply_r_mips_lo16(struct module *me, uint32_t *location,
462 unsigned long insnlo = *location;
463 Elf32_Addr val, vallo;
465 /* Sign extend the addend we extract from the lo insn. */
466 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
468 if (mips_hi16_list != NULL) {
473 struct mips_hi16 *next;
477 * The value for the HI16 had best be the same.
480 printk(KERN_DEBUG "VPE loader: "
481 "apply_r_mips_lo16/hi16: \t"
482 "inconsistent value information\n");
487 * Do the HI16 relocation. Note that we actually don't
488 * need to know anything about the LO16 itself, except
489 * where to find the low 16 bits of the addend needed
493 val = ((insn & 0xffff) << 16) + vallo;
497 * Account for the sign extension that will happen in
500 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
502 insn = (insn & ~0xffff) | val;
510 mips_hi16_list = NULL;
514 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
517 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
523 static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
525 [R_MIPS_NONE] = apply_r_mips_none,
526 [R_MIPS_32] = apply_r_mips_32,
527 [R_MIPS_26] = apply_r_mips_26,
528 [R_MIPS_HI16] = apply_r_mips_hi16,
529 [R_MIPS_LO16] = apply_r_mips_lo16,
530 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
531 [R_MIPS_PC16] = apply_r_mips_pc16
534 static char *rstrs[] = {
535 [R_MIPS_NONE] = "MIPS_NONE",
536 [R_MIPS_32] = "MIPS_32",
537 [R_MIPS_26] = "MIPS_26",
538 [R_MIPS_HI16] = "MIPS_HI16",
539 [R_MIPS_LO16] = "MIPS_LO16",
540 [R_MIPS_GPREL16] = "MIPS_GPREL16",
541 [R_MIPS_PC16] = "MIPS_PC16"
544 int apply_relocations(Elf32_Shdr *sechdrs,
546 unsigned int symindex,
550 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
557 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
558 Elf32_Word r_info = rel[i].r_info;
560 /* This is where to make the change */
561 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
563 /* This is the symbol it is referring to */
564 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
565 + ELF32_R_SYM(r_info);
567 if (!sym->st_value) {
568 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
569 me->name, strtab + sym->st_name);
570 /* just print the warning, dont barf */
575 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
577 char *r = rstrs[ELF32_R_TYPE(r_info)];
578 printk(KERN_WARNING "VPE loader: .text+0x%x "
579 "relocation type %s for symbol \"%s\" failed\n",
580 rel[i].r_offset, r ? r : "UNKNOWN",
581 strtab + sym->st_name);
589 void save_gp_address(unsigned int secbase, unsigned int rel)
591 gp_addr = secbase + rel;
592 gp_offs = gp_addr - (secbase & 0xffff0000);
594 /* end module-elf32.c */
598 /* Change all symbols so that sh_value encodes the pointer directly. */
599 static void simplify_symbols(Elf_Shdr * sechdrs,
600 unsigned int symindex,
602 const char *secstrings,
603 unsigned int nsecs, struct module *mod)
605 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
606 unsigned long secbase, bssbase = 0;
607 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
610 /* find the .bss section for COMMON symbols */
611 for (i = 0; i < nsecs; i++) {
612 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
613 bssbase = sechdrs[i].sh_addr;
618 for (i = 1; i < n; i++) {
619 switch (sym[i].st_shndx) {
621 /* Allocate space for the symbol in the .bss section.
622 st_value is currently size.
623 We want it to have the address of the symbol. */
625 size = sym[i].st_value;
626 sym[i].st_value = bssbase;
632 /* Don't need to do anything */
639 case SHN_MIPS_SCOMMON:
640 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON "
641 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
647 secbase = sechdrs[sym[i].st_shndx].sh_addr;
649 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
650 save_gp_address(secbase, sym[i].st_value);
653 sym[i].st_value += secbase;
659 #ifdef DEBUG_ELFLOADER
660 static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
661 const char *strtab, struct module *mod)
663 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
664 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
666 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
667 for (i = 1; i < n; i++) {
668 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
669 strtab + sym[i].st_name, sym[i].st_value);
674 /* We are prepared so configure and start the VPE... */
675 static int vpe_run(struct vpe * v)
677 unsigned long flags, val, dmt_flag;
678 struct vpe_notifications *n;
679 unsigned int vpeflags;
682 /* check we are the Master VPE */
683 local_irq_save(flags);
684 val = read_c0_vpeconf0();
685 if (!(val & VPECONF0_MVP)) {
687 "VPE loader: only Master VPE's are allowed to configure MT\n");
688 local_irq_restore(flags);
696 if (!list_empty(&v->tc)) {
697 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
700 local_irq_restore(flags);
703 "VPE loader: TC %d is already in use.\n",
710 local_irq_restore(flags);
713 "VPE loader: No TC's associated with VPE %d\n",
719 /* Put MVPE's into 'configuration state' */
720 set_c0_mvpcontrol(MVPCONTROL_VPC);
724 /* should check it is halted, and not activated */
725 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
728 local_irq_restore(flags);
730 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
736 /* Write the address we want it to start running from in the TCPC register. */
737 write_tc_c0_tcrestart((unsigned long)v->__start);
738 write_tc_c0_tccontext((unsigned long)0);
741 * Mark the TC as activated, not interrupt exempt and not dynamically
744 val = read_tc_c0_tcstatus();
745 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
746 write_tc_c0_tcstatus(val);
748 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
751 * The sde-kit passes 'memsize' to __start in $a3, so set something
752 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
753 * DFLT_HEAP_SIZE when you compile your program
756 mttgpr(7, physical_memsize);
760 * bind the TC to VPE 1 as late as possible so we only have the final
761 * VPE registers to set up, and so an EJTAG probe can trigger on it
763 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
765 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
767 back_to_back_c0_hazard();
769 /* Set up the XTC bit in vpeconf0 to point at our tc */
770 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
771 | (t->index << VPECONF0_XTC_SHIFT));
773 back_to_back_c0_hazard();
775 /* enable this VPE */
776 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
778 /* clear out any left overs from a previous program */
779 write_vpe_c0_status(0);
780 write_vpe_c0_cause(0);
782 /* take system out of configuration state */
783 clear_c0_mvpcontrol(MVPCONTROL_VPC);
786 * SMTC/SMVP kernels manage VPE enable independently,
787 * but uniprocessor kernels need to turn it on, even
788 * if that wasn't the pre-dvpe() state.
796 local_irq_restore(flags);
798 list_for_each_entry(n, &v->notify, list)
804 static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
805 unsigned int symindex, const char *strtab,
808 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
809 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
811 for (i = 1; i < n; i++) {
812 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
813 v->__start = sym[i].st_value;
816 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
817 v->shared_ptr = (void *)sym[i].st_value;
821 if ( (v->__start == 0) || (v->shared_ptr == NULL))
828 * Allocates a VPE with some program code space(the load address), copies the
829 * contents of the program (p)buffer performing relocatations/etc, free's it
832 static int vpe_elfload(struct vpe * v)
837 char *secstrings, *strtab = NULL;
838 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
839 struct module mod; // so we can re-use the relocations code
841 memset(&mod, 0, sizeof(struct module));
842 strcpy(mod.name, "VPE loader");
844 hdr = (Elf_Ehdr *) v->pbuffer;
847 /* Sanity checks against insmoding binaries or wrong arch,
849 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
850 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
851 || !elf_check_arch(hdr)
852 || hdr->e_shentsize != sizeof(*sechdrs)) {
854 "VPE loader: program wrong arch or weird elf version\n");
859 if (hdr->e_type == ET_REL)
862 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
863 printk(KERN_ERR "VPE loader: program length %u truncated\n",
869 /* Convenience variables */
870 sechdrs = (void *)hdr + hdr->e_shoff;
871 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
872 sechdrs[0].sh_addr = 0;
874 /* And these should exist, but gcc whinges if we don't init them */
875 symindex = strindex = 0;
878 for (i = 1; i < hdr->e_shnum; i++) {
879 if (sechdrs[i].sh_type != SHT_NOBITS
880 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
881 printk(KERN_ERR "VPE program length %u truncated\n",
886 /* Mark all sections sh_addr with their address in the
888 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
890 /* Internal symbols and strings. */
891 if (sechdrs[i].sh_type == SHT_SYMTAB) {
893 strindex = sechdrs[i].sh_link;
894 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
897 layout_sections(&mod, hdr, sechdrs, secstrings);
900 v->load_addr = alloc_progmem(mod.core_size);
904 pr_info("VPE loader: loading to %p\n", v->load_addr);
907 for (i = 0; i < hdr->e_shnum; i++) {
910 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
913 dest = v->load_addr + sechdrs[i].sh_entsize;
915 if (sechdrs[i].sh_type != SHT_NOBITS)
916 memcpy(dest, (void *)sechdrs[i].sh_addr,
918 /* Update sh_addr to point to copy in image. */
919 sechdrs[i].sh_addr = (unsigned long)dest;
921 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
922 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
925 /* Fix up syms, so that st_value is a pointer to location. */
926 simplify_symbols(sechdrs, symindex, strtab, secstrings,
929 /* Now do relocations. */
930 for (i = 1; i < hdr->e_shnum; i++) {
931 const char *strtab = (char *)sechdrs[strindex].sh_addr;
932 unsigned int info = sechdrs[i].sh_info;
934 /* Not a valid relocation section? */
935 if (info >= hdr->e_shnum)
938 /* Don't bother with non-allocated sections */
939 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
942 if (sechdrs[i].sh_type == SHT_REL)
943 err = apply_relocations(sechdrs, strtab, symindex, i,
945 else if (sechdrs[i].sh_type == SHT_RELA)
946 err = apply_relocate_add(sechdrs, strtab, symindex, i,
953 struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
955 for (i = 0; i < hdr->e_phnum; i++) {
956 if (phdr->p_type == PT_LOAD) {
957 memcpy((void *)phdr->p_paddr,
958 (char *)hdr + phdr->p_offset,
960 memset((void *)phdr->p_paddr + phdr->p_filesz,
961 0, phdr->p_memsz - phdr->p_filesz);
966 for (i = 0; i < hdr->e_shnum; i++) {
967 /* Internal symbols and strings. */
968 if (sechdrs[i].sh_type == SHT_SYMTAB) {
970 strindex = sechdrs[i].sh_link;
971 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
973 /* mark the symtab's address for when we try to find the
975 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
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);
1024 /* bind it to anything other than VPE1 */
1025 // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1027 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1030 local_irq_restore(flags);
1033 static int getcwd(char *buff, int size)
1035 mm_segment_t old_fs;
1041 ret = sys_getcwd(buff, size);
1048 /* checks VPE is unused and gets ready to load program */
1049 static int vpe_open(struct inode *inode, struct file *filp)
1051 enum vpe_state state;
1052 struct vpe_notifications *not;
1057 if (minor != iminor(inode)) {
1058 /* assume only 1 device at the moment. */
1059 printk(KERN_WARNING "VPE loader: only vpe1 is supported\n");
1064 if ((v = get_vpe(tclimit)) == NULL) {
1065 printk(KERN_WARNING "VPE loader: unable to get vpe\n");
1070 state = xchg(&v->state, VPE_STATE_INUSE);
1071 if (state != VPE_STATE_UNUSED) {
1072 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1074 list_for_each_entry(not, &v->notify, list) {
1078 release_progmem(v->load_addr);
1079 cleanup_tc(get_tc(tclimit));
1082 /* this of-course trashes what was there before... */
1083 v->pbuffer = vmalloc(P_SIZE);
1085 v->load_addr = NULL;
1088 v->uid = filp->f_cred->fsuid;
1089 v->gid = filp->f_cred->fsgid;
1091 #ifdef CONFIG_MIPS_APSP_KSPD
1092 /* get kspd to tell us when a syscall_exit happens */
1093 if (!kspd_events_reqd) {
1094 kspd_notify(&kspd_events);
1100 ret = getcwd(v->cwd, VPE_PATH_MAX);
1102 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1104 v->shared_ptr = NULL;
1112 static int vpe_release(struct inode *inode, struct file *filp)
1118 v = get_vpe(tclimit);
1122 hdr = (Elf_Ehdr *) v->pbuffer;
1123 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
1124 if (vpe_elfload(v) >= 0) {
1127 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1131 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1135 /* It's good to be able to run the SP and if it chokes have a look at
1136 the /dev/rt?. But if we reset the pointer to the shared struct we
1137 lose what has happened. So perhaps if garbage is sent to the vpe
1138 device, use it as a trigger for the reset. Hopefully a nice
1139 executable will be along shortly. */
1141 v->shared_ptr = NULL;
1143 // cleanup any temp buffers
1150 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1151 size_t count, loff_t * ppos)
1156 if (iminor(file->f_path.dentry->d_inode) != minor)
1159 v = get_vpe(tclimit);
1163 if (v->pbuffer == NULL) {
1164 printk(KERN_ERR "VPE loader: no buffer for program\n");
1168 if ((count + v->len) > v->plen) {
1170 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1174 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1182 static const struct file_operations vpe_fops = {
1183 .owner = THIS_MODULE,
1185 .release = vpe_release,
1189 /* module wrapper entry points */
1191 vpe_handle vpe_alloc(void)
1197 for (i = 1; i < MAX_VPES; i++) {
1198 if ((v = get_vpe(i)) != NULL) {
1199 v->state = VPE_STATE_INUSE;
1206 EXPORT_SYMBOL(vpe_alloc);
1208 /* start running from here */
1209 int vpe_start(vpe_handle vpe, unsigned long start)
1211 struct vpe *v = vpe;
1217 EXPORT_SYMBOL(vpe_start);
1219 /* halt it for now */
1220 int vpe_stop(vpe_handle vpe)
1222 struct vpe *v = vpe;
1224 unsigned int evpe_flags;
1226 evpe_flags = dvpe();
1228 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1231 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1239 EXPORT_SYMBOL(vpe_stop);
1241 /* I've done with it thank you */
1242 int vpe_free(vpe_handle vpe)
1244 struct vpe *v = vpe;
1246 unsigned int evpe_flags;
1248 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1252 evpe_flags = dvpe();
1254 /* Put MVPE's into 'configuration state' */
1255 set_c0_mvpcontrol(MVPCONTROL_VPC);
1258 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1261 write_tc_c0_tchalt(TCHALT_H);
1264 /* mark the TC unallocated */
1265 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1267 v->state = VPE_STATE_UNUSED;
1269 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1275 EXPORT_SYMBOL(vpe_free);
1277 void *vpe_get_shared(int index)
1281 if ((v = get_vpe(index)) == NULL)
1284 return v->shared_ptr;
1287 EXPORT_SYMBOL(vpe_get_shared);
1289 int vpe_getuid(int index)
1293 if ((v = get_vpe(index)) == NULL)
1299 EXPORT_SYMBOL(vpe_getuid);
1301 int vpe_getgid(int index)
1305 if ((v = get_vpe(index)) == NULL)
1311 EXPORT_SYMBOL(vpe_getgid);
1313 int vpe_notify(int index, struct vpe_notifications *notify)
1317 if ((v = get_vpe(index)) == NULL)
1320 list_add(¬ify->list, &v->notify);
1324 EXPORT_SYMBOL(vpe_notify);
1326 char *vpe_getcwd(int index)
1330 if ((v = get_vpe(index)) == NULL)
1336 EXPORT_SYMBOL(vpe_getcwd);
1338 #ifdef CONFIG_MIPS_APSP_KSPD
1339 static void kspd_sp_exit( int sp_id)
1341 cleanup_tc(get_tc(sp_id));
1345 static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
1346 const char *buf, size_t len)
1348 struct vpe *vpe = get_vpe(tclimit);
1349 struct vpe_notifications *not;
1351 list_for_each_entry(not, &vpe->notify, list) {
1355 release_progmem(vpe->load_addr);
1356 cleanup_tc(get_tc(tclimit));
1363 static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr,
1366 struct vpe *vpe = get_vpe(tclimit);
1368 return sprintf(buf, "%d\n", vpe->ntcs);
1371 static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr,
1372 const char *buf, size_t len)
1374 struct vpe *vpe = get_vpe(tclimit);
1378 new = simple_strtoul(buf, &endp, 0);
1382 if (new == 0 || new > (hw_tcs - tclimit))
1393 static struct device_attribute vpe_class_attributes[] = {
1394 __ATTR(kill, S_IWUSR, NULL, store_kill),
1395 __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
1399 static void vpe_device_release(struct device *cd)
1404 struct class vpe_class = {
1406 .owner = THIS_MODULE,
1407 .dev_release = vpe_device_release,
1408 .dev_attrs = vpe_class_attributes,
1411 struct device vpe_device;
1413 static int __init vpe_module_init(void)
1415 unsigned int mtflags, vpflags;
1416 unsigned long flags, val;
1417 struct vpe *v = NULL;
1421 if (!cpu_has_mipsmt) {
1422 printk("VPE loader: not a MIPS MT capable processor\n");
1426 if (vpelimit == 0) {
1427 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1428 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1429 "kernel argument\n");
1435 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1436 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1437 "kernel argument\n");
1442 major = register_chrdev(0, module_name, &vpe_fops);
1444 printk("VPE loader: unable to register character device\n");
1448 err = class_register(&vpe_class);
1450 printk(KERN_ERR "vpe_class registration failed\n");
1454 device_initialize(&vpe_device);
1455 vpe_device.class = &vpe_class,
1456 vpe_device.parent = NULL,
1457 dev_set_name(&vpe_device, "vpe1");
1458 vpe_device.devt = MKDEV(major, minor);
1459 err = device_add(&vpe_device);
1461 printk(KERN_ERR "Adding vpe_device failed\n");
1465 local_irq_save(flags);
1469 /* Put MVPE's into 'configuration state' */
1470 set_c0_mvpcontrol(MVPCONTROL_VPC);
1472 /* dump_mtregs(); */
1474 val = read_c0_mvpconf0();
1475 hw_tcs = (val & MVPCONF0_PTC) + 1;
1476 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1478 for (tc = tclimit; tc < hw_tcs; tc++) {
1480 * Must re-enable multithreading temporarily or in case we
1481 * reschedule send IPIs or similar we might hang.
1483 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1486 local_irq_restore(flags);
1493 local_irq_save(flags);
1496 set_c0_mvpcontrol(MVPCONTROL_VPC);
1502 if ((v = alloc_vpe(tc)) == NULL) {
1503 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1508 v->ntcs = hw_tcs - tclimit;
1510 /* add the tc to the list of this vpe's tc's. */
1511 list_add(&t->tc, &v->tc);
1513 /* deactivate all but vpe0 */
1514 if (tc >= tclimit) {
1515 unsigned long tmp = read_vpe_c0_vpeconf0();
1517 tmp &= ~VPECONF0_VPA;
1520 tmp |= VPECONF0_MVP;
1521 write_vpe_c0_vpeconf0(tmp);
1524 /* disable multi-threading with TC's */
1525 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1527 if (tc >= vpelimit) {
1529 * Set config to be the same as vpe0,
1530 * particularly kseg0 coherency alg
1532 write_vpe_c0_config(read_c0_config());
1537 t->pvpe = v; /* set the parent vpe */
1539 if (tc >= tclimit) {
1544 /* Any TC that is bound to VPE0 gets left as is - in case
1545 we are running SMTC on VPE0. A TC that is bound to any
1546 other VPE gets bound to VPE0, ideally I'd like to make
1547 it homeless but it doesn't appear to let me bind a TC
1548 to a non-existent VPE. Which is perfectly reasonable.
1550 The (un)bound state is visible to an EJTAG probe so may
1554 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1555 /* tc is bound >vpe0 */
1556 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1558 t->pvpe = get_vpe(0); /* set the parent vpe */
1562 write_tc_c0_tchalt(TCHALT_H);
1565 tmp = read_tc_c0_tcstatus();
1567 /* mark not activated and not dynamically allocatable */
1568 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1569 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1570 write_tc_c0_tcstatus(tmp);
1575 /* release config state */
1576 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1580 local_irq_restore(flags);
1582 #ifdef CONFIG_MIPS_APSP_KSPD
1583 kspd_events.kspd_sp_exit = kspd_sp_exit;
1588 class_unregister(&vpe_class);
1590 unregister_chrdev(major, module_name);
1596 static void __exit vpe_module_exit(void)
1600 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1601 if (v->state != VPE_STATE_UNUSED) {
1606 device_del(&vpe_device);
1607 unregister_chrdev(major, module_name);
1610 module_init(vpe_module_init);
1611 module_exit(vpe_module_exit);
1612 MODULE_DESCRIPTION("MIPS VPE Loader");
1613 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1614 MODULE_LICENSE("GPL");