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);
159 /* get the vpe associated with this minor */
160 static struct vpe *get_vpe(int minor)
167 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
168 if (v->minor == minor)
175 /* get the vpe associated with this minor */
176 static struct tc *get_tc(int index)
180 list_for_each_entry(t, &vpecontrol.tc_list, list) {
181 if (t->index == index)
188 struct tc *get_tc_unused(void)
192 list_for_each_entry(t, &vpecontrol.tc_list, list) {
193 if (t->state == TC_STATE_UNUSED)
200 /* allocate a vpe and associate it with this minor (or index) */
201 static struct vpe *alloc_vpe(int minor)
205 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) {
209 INIT_LIST_HEAD(&v->tc);
210 list_add_tail(&v->list, &vpecontrol.vpe_list);
212 INIT_LIST_HEAD(&v->notify);
217 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
218 static struct tc *alloc_tc(int index)
222 if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
225 INIT_LIST_HEAD(&tc->tc);
227 list_add_tail(&tc->list, &vpecontrol.tc_list);
233 /* clean up and free everything */
234 static void release_vpe(struct vpe *v)
242 static void dump_mtregs(void)
246 val = read_c0_config3();
247 printk("config3 0x%lx MT %ld\n", val,
248 (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
250 val = read_c0_mvpcontrol();
251 printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
252 (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
253 (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
254 (val & MVPCONTROL_EVP));
256 val = read_c0_mvpconf0();
257 printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
258 (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
259 val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
262 /* Find some VPE program space */
263 static void *alloc_progmem(unsigned long len)
267 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
269 * This means you must tell Linux to use less memory than you
270 * physically have, for example by passing a mem= boot argument.
272 addr = pfn_to_kaddr(max_low_pfn);
273 memset(addr, 0, len);
275 /* simple grab some mem for now */
276 addr = kzalloc(len, GFP_KERNEL);
282 static void release_progmem(void *ptr)
284 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
289 /* Update size with this section: return offset. */
290 static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
294 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
295 *size = ret + sechdr->sh_size;
299 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
300 might -- code, read-only data, read-write data, small data. Tally
301 sizes, and place the offsets into sh_entsize fields: high bit means it
303 static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
304 Elf_Shdr * sechdrs, const char *secstrings)
306 static unsigned long const masks[][2] = {
307 /* NOTE: all executable code must be the first section
308 * in this array; otherwise modify the text_size
309 * finder in the two loops below */
310 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
311 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
312 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
313 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
317 for (i = 0; i < hdr->e_shnum; i++)
318 sechdrs[i].sh_entsize = ~0UL;
320 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
321 for (i = 0; i < hdr->e_shnum; ++i) {
322 Elf_Shdr *s = &sechdrs[i];
324 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
325 if ((s->sh_flags & masks[m][0]) != masks[m][0]
326 || (s->sh_flags & masks[m][1])
327 || s->sh_entsize != ~0UL)
330 get_offset((unsigned long *)&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;
464 struct mips_hi16 *l, *next;
466 /* Sign extend the addend we extract from the lo insn. */
467 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
469 if (mips_hi16_list != NULL) {
476 * The value for the HI16 had best be the same.
479 printk(KERN_DEBUG "VPE loader: "
480 "apply_r_mips_lo16/hi16: \t"
481 "inconsistent value information\n");
486 * Do the HI16 relocation. Note that we actually don't
487 * need to know anything about the LO16 itself, except
488 * where to find the low 16 bits of the addend needed
492 val = ((insn & 0xffff) << 16) + vallo;
496 * Account for the sign extension that will happen in
499 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
501 insn = (insn & ~0xffff) | val;
509 mips_hi16_list = NULL;
513 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
516 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
527 mips_hi16_list = NULL;
532 static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
534 [R_MIPS_NONE] = apply_r_mips_none,
535 [R_MIPS_32] = apply_r_mips_32,
536 [R_MIPS_26] = apply_r_mips_26,
537 [R_MIPS_HI16] = apply_r_mips_hi16,
538 [R_MIPS_LO16] = apply_r_mips_lo16,
539 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
540 [R_MIPS_PC16] = apply_r_mips_pc16
543 static char *rstrs[] = {
544 [R_MIPS_NONE] = "MIPS_NONE",
545 [R_MIPS_32] = "MIPS_32",
546 [R_MIPS_26] = "MIPS_26",
547 [R_MIPS_HI16] = "MIPS_HI16",
548 [R_MIPS_LO16] = "MIPS_LO16",
549 [R_MIPS_GPREL16] = "MIPS_GPREL16",
550 [R_MIPS_PC16] = "MIPS_PC16"
553 static int apply_relocations(Elf32_Shdr *sechdrs,
555 unsigned int symindex,
559 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
566 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
567 Elf32_Word r_info = rel[i].r_info;
569 /* This is where to make the change */
570 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
572 /* This is the symbol it is referring to */
573 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
574 + ELF32_R_SYM(r_info);
576 if (!sym->st_value) {
577 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
578 me->name, strtab + sym->st_name);
579 /* just print the warning, dont barf */
584 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
586 char *r = rstrs[ELF32_R_TYPE(r_info)];
587 printk(KERN_WARNING "VPE loader: .text+0x%x "
588 "relocation type %s for symbol \"%s\" failed\n",
589 rel[i].r_offset, r ? r : "UNKNOWN",
590 strtab + sym->st_name);
598 static inline void save_gp_address(unsigned int secbase, unsigned int rel)
600 gp_addr = secbase + rel;
601 gp_offs = gp_addr - (secbase & 0xffff0000);
603 /* end module-elf32.c */
607 /* Change all symbols so that sh_value encodes the pointer directly. */
608 static void simplify_symbols(Elf_Shdr * sechdrs,
609 unsigned int symindex,
611 const char *secstrings,
612 unsigned int nsecs, struct module *mod)
614 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
615 unsigned long secbase, bssbase = 0;
616 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
619 /* find the .bss section for COMMON symbols */
620 for (i = 0; i < nsecs; i++) {
621 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
622 bssbase = sechdrs[i].sh_addr;
627 for (i = 1; i < n; i++) {
628 switch (sym[i].st_shndx) {
630 /* Allocate space for the symbol in the .bss section.
631 st_value is currently size.
632 We want it to have the address of the symbol. */
634 size = sym[i].st_value;
635 sym[i].st_value = bssbase;
641 /* Don't need to do anything */
648 case SHN_MIPS_SCOMMON:
649 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON "
650 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
656 secbase = sechdrs[sym[i].st_shndx].sh_addr;
658 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
659 save_gp_address(secbase, sym[i].st_value);
662 sym[i].st_value += secbase;
668 #ifdef DEBUG_ELFLOADER
669 static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
670 const char *strtab, struct module *mod)
672 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
673 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
675 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
676 for (i = 1; i < n; i++) {
677 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
678 strtab + sym[i].st_name, sym[i].st_value);
683 /* We are prepared so configure and start the VPE... */
684 static int vpe_run(struct vpe * v)
686 unsigned long flags, val, dmt_flag;
687 struct vpe_notifications *n;
688 unsigned int vpeflags;
691 /* check we are the Master VPE */
692 local_irq_save(flags);
693 val = read_c0_vpeconf0();
694 if (!(val & VPECONF0_MVP)) {
696 "VPE loader: only Master VPE's are allowed to configure MT\n");
697 local_irq_restore(flags);
705 if (!list_empty(&v->tc)) {
706 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
709 local_irq_restore(flags);
712 "VPE loader: TC %d is already in use.\n",
719 local_irq_restore(flags);
722 "VPE loader: No TC's associated with VPE %d\n",
728 /* Put MVPE's into 'configuration state' */
729 set_c0_mvpcontrol(MVPCONTROL_VPC);
733 /* should check it is halted, and not activated */
734 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
737 local_irq_restore(flags);
739 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
745 /* Write the address we want it to start running from in the TCPC register. */
746 write_tc_c0_tcrestart((unsigned long)v->__start);
747 write_tc_c0_tccontext((unsigned long)0);
750 * Mark the TC as activated, not interrupt exempt and not dynamically
753 val = read_tc_c0_tcstatus();
754 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
755 write_tc_c0_tcstatus(val);
757 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
760 * The sde-kit passes 'memsize' to __start in $a3, so set something
761 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
762 * DFLT_HEAP_SIZE when you compile your program
765 mttgpr(7, physical_memsize);
769 * bind the TC to VPE 1 as late as possible so we only have the final
770 * VPE registers to set up, and so an EJTAG probe can trigger on it
772 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
774 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
776 back_to_back_c0_hazard();
778 /* Set up the XTC bit in vpeconf0 to point at our tc */
779 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
780 | (t->index << VPECONF0_XTC_SHIFT));
782 back_to_back_c0_hazard();
784 /* enable this VPE */
785 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
787 /* clear out any left overs from a previous program */
788 write_vpe_c0_status(0);
789 write_vpe_c0_cause(0);
791 /* take system out of configuration state */
792 clear_c0_mvpcontrol(MVPCONTROL_VPC);
795 * SMTC/SMVP kernels manage VPE enable independently,
796 * but uniprocessor kernels need to turn it on, even
797 * if that wasn't the pre-dvpe() state.
805 local_irq_restore(flags);
807 list_for_each_entry(n, &v->notify, list)
813 static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
814 unsigned int symindex, const char *strtab,
817 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
818 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
820 for (i = 1; i < n; i++) {
821 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
822 v->__start = sym[i].st_value;
825 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
826 v->shared_ptr = (void *)sym[i].st_value;
830 if ( (v->__start == 0) || (v->shared_ptr == NULL))
837 * Allocates a VPE with some program code space(the load address), copies the
838 * contents of the program (p)buffer performing relocatations/etc, free's it
841 static int vpe_elfload(struct vpe * v)
846 char *secstrings, *strtab = NULL;
847 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
848 struct module mod; // so we can re-use the relocations code
850 memset(&mod, 0, sizeof(struct module));
851 strcpy(mod.name, "VPE loader");
853 hdr = (Elf_Ehdr *) v->pbuffer;
856 /* Sanity checks against insmoding binaries or wrong arch,
858 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
859 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
860 || !elf_check_arch(hdr)
861 || hdr->e_shentsize != sizeof(*sechdrs)) {
863 "VPE loader: program wrong arch or weird elf version\n");
868 if (hdr->e_type == ET_REL)
871 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
872 printk(KERN_ERR "VPE loader: program length %u truncated\n",
878 /* Convenience variables */
879 sechdrs = (void *)hdr + hdr->e_shoff;
880 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
881 sechdrs[0].sh_addr = 0;
883 /* And these should exist, but gcc whinges if we don't init them */
884 symindex = strindex = 0;
887 for (i = 1; i < hdr->e_shnum; i++) {
888 if (sechdrs[i].sh_type != SHT_NOBITS
889 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
890 printk(KERN_ERR "VPE program length %u truncated\n",
895 /* Mark all sections sh_addr with their address in the
897 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
899 /* Internal symbols and strings. */
900 if (sechdrs[i].sh_type == SHT_SYMTAB) {
902 strindex = sechdrs[i].sh_link;
903 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
906 layout_sections(&mod, hdr, sechdrs, secstrings);
909 v->load_addr = alloc_progmem(mod.core_size);
913 pr_info("VPE loader: loading to %p\n", v->load_addr);
916 for (i = 0; i < hdr->e_shnum; i++) {
919 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
922 dest = v->load_addr + sechdrs[i].sh_entsize;
924 if (sechdrs[i].sh_type != SHT_NOBITS)
925 memcpy(dest, (void *)sechdrs[i].sh_addr,
927 /* Update sh_addr to point to copy in image. */
928 sechdrs[i].sh_addr = (unsigned long)dest;
930 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
931 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
934 /* Fix up syms, so that st_value is a pointer to location. */
935 simplify_symbols(sechdrs, symindex, strtab, secstrings,
938 /* Now do relocations. */
939 for (i = 1; i < hdr->e_shnum; i++) {
940 const char *strtab = (char *)sechdrs[strindex].sh_addr;
941 unsigned int info = sechdrs[i].sh_info;
943 /* Not a valid relocation section? */
944 if (info >= hdr->e_shnum)
947 /* Don't bother with non-allocated sections */
948 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
951 if (sechdrs[i].sh_type == SHT_REL)
952 err = apply_relocations(sechdrs, strtab, symindex, i,
954 else if (sechdrs[i].sh_type == SHT_RELA)
955 err = apply_relocate_add(sechdrs, strtab, symindex, i,
962 struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
964 for (i = 0; i < hdr->e_phnum; i++) {
965 if (phdr->p_type == PT_LOAD) {
966 memcpy((void *)phdr->p_paddr,
967 (char *)hdr + phdr->p_offset,
969 memset((void *)phdr->p_paddr + phdr->p_filesz,
970 0, phdr->p_memsz - phdr->p_filesz);
975 for (i = 0; i < hdr->e_shnum; i++) {
976 /* Internal symbols and strings. */
977 if (sechdrs[i].sh_type == SHT_SYMTAB) {
979 strindex = sechdrs[i].sh_link;
980 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
982 /* mark the symtab's address for when we try to find the
984 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
989 /* make sure it's physically written out */
990 flush_icache_range((unsigned long)v->load_addr,
991 (unsigned long)v->load_addr + v->len);
993 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
994 if (v->__start == 0) {
995 printk(KERN_WARNING "VPE loader: program does not contain "
996 "a __start symbol\n");
1000 if (v->shared_ptr == NULL)
1001 printk(KERN_WARNING "VPE loader: "
1002 "program does not contain vpe_shared symbol.\n"
1003 " Unable to use AMVP (AP/SP) facilities.\n");
1006 printk(" elf loaded\n");
1010 static void cleanup_tc(struct tc *tc)
1012 unsigned long flags;
1013 unsigned int mtflags, vpflags;
1016 local_irq_save(flags);
1019 /* Put MVPE's into 'configuration state' */
1020 set_c0_mvpcontrol(MVPCONTROL_VPC);
1023 tmp = read_tc_c0_tcstatus();
1025 /* mark not allocated and not dynamically allocatable */
1026 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1027 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1028 write_tc_c0_tcstatus(tmp);
1030 write_tc_c0_tchalt(TCHALT_H);
1033 /* bind it to anything other than VPE1 */
1034 // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1036 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1039 local_irq_restore(flags);
1042 static int getcwd(char *buff, int size)
1044 mm_segment_t old_fs;
1050 ret = sys_getcwd(buff, size);
1057 /* checks VPE is unused and gets ready to load program */
1058 static int vpe_open(struct inode *inode, struct file *filp)
1060 enum vpe_state state;
1061 struct vpe_notifications *not;
1066 if (minor != iminor(inode)) {
1067 /* assume only 1 device at the moment. */
1068 printk(KERN_WARNING "VPE loader: only vpe1 is supported\n");
1073 if ((v = get_vpe(tclimit)) == NULL) {
1074 printk(KERN_WARNING "VPE loader: unable to get vpe\n");
1079 state = xchg(&v->state, VPE_STATE_INUSE);
1080 if (state != VPE_STATE_UNUSED) {
1081 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1083 list_for_each_entry(not, &v->notify, list) {
1087 release_progmem(v->load_addr);
1088 cleanup_tc(get_tc(tclimit));
1091 /* this of-course trashes what was there before... */
1092 v->pbuffer = vmalloc(P_SIZE);
1094 v->load_addr = NULL;
1097 v->uid = filp->f_cred->fsuid;
1098 v->gid = filp->f_cred->fsgid;
1100 #ifdef CONFIG_MIPS_APSP_KSPD
1101 /* get kspd to tell us when a syscall_exit happens */
1102 if (!kspd_events_reqd) {
1103 kspd_notify(&kspd_events);
1109 ret = getcwd(v->cwd, VPE_PATH_MAX);
1111 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1113 v->shared_ptr = NULL;
1121 static int vpe_release(struct inode *inode, struct file *filp)
1127 v = get_vpe(tclimit);
1131 hdr = (Elf_Ehdr *) v->pbuffer;
1132 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
1133 if (vpe_elfload(v) >= 0) {
1136 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1140 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1144 /* It's good to be able to run the SP and if it chokes have a look at
1145 the /dev/rt?. But if we reset the pointer to the shared struct we
1146 lose what has happened. So perhaps if garbage is sent to the vpe
1147 device, use it as a trigger for the reset. Hopefully a nice
1148 executable will be along shortly. */
1150 v->shared_ptr = NULL;
1152 // cleanup any temp buffers
1159 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1160 size_t count, loff_t * ppos)
1165 if (iminor(file->f_path.dentry->d_inode) != minor)
1168 v = get_vpe(tclimit);
1172 if (v->pbuffer == NULL) {
1173 printk(KERN_ERR "VPE loader: no buffer for program\n");
1177 if ((count + v->len) > v->plen) {
1179 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1183 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1191 static const struct file_operations vpe_fops = {
1192 .owner = THIS_MODULE,
1194 .release = vpe_release,
1198 /* module wrapper entry points */
1200 vpe_handle vpe_alloc(void)
1206 for (i = 1; i < MAX_VPES; i++) {
1207 if ((v = get_vpe(i)) != NULL) {
1208 v->state = VPE_STATE_INUSE;
1215 EXPORT_SYMBOL(vpe_alloc);
1217 /* start running from here */
1218 int vpe_start(vpe_handle vpe, unsigned long start)
1220 struct vpe *v = vpe;
1226 EXPORT_SYMBOL(vpe_start);
1228 /* halt it for now */
1229 int vpe_stop(vpe_handle vpe)
1231 struct vpe *v = vpe;
1233 unsigned int evpe_flags;
1235 evpe_flags = dvpe();
1237 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1240 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1248 EXPORT_SYMBOL(vpe_stop);
1250 /* I've done with it thank you */
1251 int vpe_free(vpe_handle vpe)
1253 struct vpe *v = vpe;
1255 unsigned int evpe_flags;
1257 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1261 evpe_flags = dvpe();
1263 /* Put MVPE's into 'configuration state' */
1264 set_c0_mvpcontrol(MVPCONTROL_VPC);
1267 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1270 write_tc_c0_tchalt(TCHALT_H);
1273 /* mark the TC unallocated */
1274 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1276 v->state = VPE_STATE_UNUSED;
1278 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1284 EXPORT_SYMBOL(vpe_free);
1286 void *vpe_get_shared(int index)
1290 if ((v = get_vpe(index)) == NULL)
1293 return v->shared_ptr;
1296 EXPORT_SYMBOL(vpe_get_shared);
1298 int vpe_getuid(int index)
1302 if ((v = get_vpe(index)) == NULL)
1308 EXPORT_SYMBOL(vpe_getuid);
1310 int vpe_getgid(int index)
1314 if ((v = get_vpe(index)) == NULL)
1320 EXPORT_SYMBOL(vpe_getgid);
1322 int vpe_notify(int index, struct vpe_notifications *notify)
1326 if ((v = get_vpe(index)) == NULL)
1329 list_add(¬ify->list, &v->notify);
1333 EXPORT_SYMBOL(vpe_notify);
1335 char *vpe_getcwd(int index)
1339 if ((v = get_vpe(index)) == NULL)
1345 EXPORT_SYMBOL(vpe_getcwd);
1347 #ifdef CONFIG_MIPS_APSP_KSPD
1348 static void kspd_sp_exit( int sp_id)
1350 cleanup_tc(get_tc(sp_id));
1354 static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
1355 const char *buf, size_t len)
1357 struct vpe *vpe = get_vpe(tclimit);
1358 struct vpe_notifications *not;
1360 list_for_each_entry(not, &vpe->notify, list) {
1364 release_progmem(vpe->load_addr);
1365 cleanup_tc(get_tc(tclimit));
1372 static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr,
1375 struct vpe *vpe = get_vpe(tclimit);
1377 return sprintf(buf, "%d\n", vpe->ntcs);
1380 static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr,
1381 const char *buf, size_t len)
1383 struct vpe *vpe = get_vpe(tclimit);
1387 new = simple_strtoul(buf, &endp, 0);
1391 if (new == 0 || new > (hw_tcs - tclimit))
1402 static struct device_attribute vpe_class_attributes[] = {
1403 __ATTR(kill, S_IWUSR, NULL, store_kill),
1404 __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
1408 static void vpe_device_release(struct device *cd)
1413 struct class vpe_class = {
1415 .owner = THIS_MODULE,
1416 .dev_release = vpe_device_release,
1417 .dev_attrs = vpe_class_attributes,
1420 struct device vpe_device;
1422 static int __init vpe_module_init(void)
1424 unsigned int mtflags, vpflags;
1425 unsigned long flags, val;
1426 struct vpe *v = NULL;
1430 if (!cpu_has_mipsmt) {
1431 printk("VPE loader: not a MIPS MT capable processor\n");
1435 if (vpelimit == 0) {
1436 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1437 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1438 "kernel argument\n");
1444 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1445 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1446 "kernel argument\n");
1451 major = register_chrdev(0, module_name, &vpe_fops);
1453 printk("VPE loader: unable to register character device\n");
1457 err = class_register(&vpe_class);
1459 printk(KERN_ERR "vpe_class registration failed\n");
1463 device_initialize(&vpe_device);
1464 vpe_device.class = &vpe_class,
1465 vpe_device.parent = NULL,
1466 dev_set_name(&vpe_device, "vpe1");
1467 vpe_device.devt = MKDEV(major, minor);
1468 err = device_add(&vpe_device);
1470 printk(KERN_ERR "Adding vpe_device failed\n");
1474 local_irq_save(flags);
1478 /* Put MVPE's into 'configuration state' */
1479 set_c0_mvpcontrol(MVPCONTROL_VPC);
1481 /* dump_mtregs(); */
1483 val = read_c0_mvpconf0();
1484 hw_tcs = (val & MVPCONF0_PTC) + 1;
1485 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1487 for (tc = tclimit; tc < hw_tcs; tc++) {
1489 * Must re-enable multithreading temporarily or in case we
1490 * reschedule send IPIs or similar we might hang.
1492 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1495 local_irq_restore(flags);
1502 local_irq_save(flags);
1505 set_c0_mvpcontrol(MVPCONTROL_VPC);
1511 if ((v = alloc_vpe(tc)) == NULL) {
1512 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1517 v->ntcs = hw_tcs - tclimit;
1519 /* add the tc to the list of this vpe's tc's. */
1520 list_add(&t->tc, &v->tc);
1522 /* deactivate all but vpe0 */
1523 if (tc >= tclimit) {
1524 unsigned long tmp = read_vpe_c0_vpeconf0();
1526 tmp &= ~VPECONF0_VPA;
1529 tmp |= VPECONF0_MVP;
1530 write_vpe_c0_vpeconf0(tmp);
1533 /* disable multi-threading with TC's */
1534 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1536 if (tc >= vpelimit) {
1538 * Set config to be the same as vpe0,
1539 * particularly kseg0 coherency alg
1541 write_vpe_c0_config(read_c0_config());
1546 t->pvpe = v; /* set the parent vpe */
1548 if (tc >= tclimit) {
1553 /* Any TC that is bound to VPE0 gets left as is - in case
1554 we are running SMTC on VPE0. A TC that is bound to any
1555 other VPE gets bound to VPE0, ideally I'd like to make
1556 it homeless but it doesn't appear to let me bind a TC
1557 to a non-existent VPE. Which is perfectly reasonable.
1559 The (un)bound state is visible to an EJTAG probe so may
1563 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1564 /* tc is bound >vpe0 */
1565 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1567 t->pvpe = get_vpe(0); /* set the parent vpe */
1571 write_tc_c0_tchalt(TCHALT_H);
1574 tmp = read_tc_c0_tcstatus();
1576 /* mark not activated and not dynamically allocatable */
1577 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1578 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1579 write_tc_c0_tcstatus(tmp);
1584 /* release config state */
1585 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1589 local_irq_restore(flags);
1591 #ifdef CONFIG_MIPS_APSP_KSPD
1592 kspd_events.kspd_sp_exit = kspd_sp_exit;
1597 class_unregister(&vpe_class);
1599 unregister_chrdev(major, module_name);
1605 static void __exit vpe_module_exit(void)
1609 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1610 if (v->state != VPE_STATE_UNUSED) {
1615 device_del(&vpe_device);
1616 unregister_chrdev(major, module_name);
1619 module_init(vpe_module_init);
1620 module_exit(vpe_module_exit);
1621 MODULE_DESCRIPTION("MIPS VPE Loader");
1622 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1623 MODULE_LICENSE("GPL");