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 environment 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>
33 #include <linux/init.h>
34 #include <asm/uaccess.h>
35 #include <linux/slab.h>
36 #include <linux/list.h>
37 #include <linux/vmalloc.h>
38 #include <linux/elf.h>
39 #include <linux/seq_file.h>
40 #include <linux/syscalls.h>
41 #include <linux/moduleloader.h>
42 #include <linux/interrupt.h>
43 #include <linux/poll.h>
44 #include <linux/bootmem.h>
45 #include <asm/mipsregs.h>
46 #include <asm/mipsmtregs.h>
47 #include <asm/cacheflush.h>
48 #include <linux/atomic.h>
50 #include <asm/mips_mt.h>
51 #include <asm/processor.h>
54 typedef void *vpe_handle;
56 #ifndef ARCH_SHF_SMALL
57 #define ARCH_SHF_SMALL 0
60 /* If this is set, the section belongs in the init part of the module */
61 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
64 * The number of TCs and VPEs physically available on the core
66 static int hw_tcs, hw_vpes;
67 static char module_name[] = "vpe";
69 static const int minor = 1; /* fixed for now */
71 /* grab the likely amount of memory we will need. */
72 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
73 #define P_SIZE (2 * 1024 * 1024)
75 /* add an overhead to the max kmalloc size for non-striped symbols/etc */
76 #define P_SIZE (256 * 1024)
79 extern unsigned long physical_memsize;
82 #define VPE_PATH_MAX 256
100 /* (device) minor associated with this vpe */
103 /* elfloader stuff */
108 unsigned int uid, gid;
109 char cwd[VPE_PATH_MAX];
111 unsigned long __start;
113 /* tc's associated with this vpe */
116 /* The list of vpe's */
117 struct list_head list;
119 /* shared symbol address */
122 /* the list of who wants to know when something major happens */
123 struct list_head notify;
132 struct vpe *pvpe; /* parent VPE */
133 struct list_head tc; /* The list of TC's with this VPE */
134 struct list_head list; /* The global list of tc's */
138 spinlock_t vpe_list_lock;
139 struct list_head vpe_list; /* Virtual processing elements */
140 spinlock_t tc_list_lock;
141 struct list_head tc_list; /* Thread contexts */
143 .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock),
144 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
145 .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock),
146 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
149 static void release_progmem(void *ptr);
151 /* get the vpe associated with this minor */
152 static struct vpe *get_vpe(int minor)
160 spin_lock(&vpecontrol.vpe_list_lock);
161 list_for_each_entry(v, &vpecontrol.vpe_list, list) {
162 if (v->minor == minor) {
167 spin_unlock(&vpecontrol.vpe_list_lock);
172 /* get the vpe associated with this minor */
173 static struct tc *get_tc(int index)
178 spin_lock(&vpecontrol.tc_list_lock);
179 list_for_each_entry(t, &vpecontrol.tc_list, list) {
180 if (t->index == index) {
185 spin_unlock(&vpecontrol.tc_list_lock);
190 /* allocate a vpe and associate it with this minor (or index) */
191 static struct vpe *alloc_vpe(int minor)
195 if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL)
198 INIT_LIST_HEAD(&v->tc);
199 spin_lock(&vpecontrol.vpe_list_lock);
200 list_add_tail(&v->list, &vpecontrol.vpe_list);
201 spin_unlock(&vpecontrol.vpe_list_lock);
203 INIT_LIST_HEAD(&v->notify);
209 /* allocate a tc. At startup only tc0 is running, all other can be halted. */
210 static struct tc *alloc_tc(int index)
214 if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
217 INIT_LIST_HEAD(&tc->tc);
220 spin_lock(&vpecontrol.tc_list_lock);
221 list_add_tail(&tc->list, &vpecontrol.tc_list);
222 spin_unlock(&vpecontrol.tc_list_lock);
228 /* clean up and free everything */
229 static void release_vpe(struct vpe *v)
237 static void __maybe_unused 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)
262 #ifdef CONFIG_MIPS_VPE_LOADER_TOM
264 * This means you must tell Linux to use less memory than you
265 * physically have, for example by passing a mem= boot argument.
267 addr = pfn_to_kaddr(max_low_pfn);
268 memset(addr, 0, len);
270 /* simple grab some mem for now */
271 addr = kzalloc(len, GFP_KERNEL);
277 static void release_progmem(void *ptr)
279 #ifndef CONFIG_MIPS_VPE_LOADER_TOM
284 /* Update size with this section: return offset. */
285 static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
289 ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
290 *size = ret + sechdr->sh_size;
294 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
295 might -- code, read-only data, read-write data, small data. Tally
296 sizes, and place the offsets into sh_entsize fields: high bit means it
298 static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
299 Elf_Shdr * sechdrs, const char *secstrings)
301 static unsigned long const masks[][2] = {
302 /* NOTE: all executable code must be the first section
303 * in this array; otherwise modify the text_size
304 * finder in the two loops below */
305 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
306 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
307 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
308 {ARCH_SHF_SMALL | SHF_ALLOC, 0}
312 for (i = 0; i < hdr->e_shnum; i++)
313 sechdrs[i].sh_entsize = ~0UL;
315 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
316 for (i = 0; i < hdr->e_shnum; ++i) {
317 Elf_Shdr *s = &sechdrs[i];
319 // || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
320 if ((s->sh_flags & masks[m][0]) != masks[m][0]
321 || (s->sh_flags & masks[m][1])
322 || s->sh_entsize != ~0UL)
325 get_offset((unsigned long *)&mod->core_size, s);
329 mod->core_text_size = mod->core_size;
335 /* from module-elf32.c, but subverted a little */
338 struct mips_hi16 *next;
343 static struct mips_hi16 *mips_hi16_list;
344 static unsigned int gp_offs, gp_addr;
346 static int apply_r_mips_none(struct module *me, uint32_t *location,
352 static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
357 if( !(*location & 0xffff) ) {
358 rel = (int)v - gp_addr;
361 /* .sbss + gp(relative) + offset */
363 rel = (int)(short)((int)v + gp_offs +
364 (int)(short)(*location & 0xffff) - gp_addr);
367 if( (rel > 32768) || (rel < -32768) ) {
368 printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
369 "relative address 0x%x out of range of gp register\n",
374 *location = (*location & 0xffff0000) | (rel & 0xffff);
379 static int apply_r_mips_pc16(struct module *me, uint32_t *location,
383 rel = (((unsigned int)v - (unsigned int)location));
384 rel >>= 2; // because the offset is in _instructions_ not bytes.
385 rel -= 1; // and one instruction less due to the branch delay slot.
387 if( (rel > 32768) || (rel < -32768) ) {
388 printk(KERN_DEBUG "VPE loader: "
389 "apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
393 *location = (*location & 0xffff0000) | (rel & 0xffff);
398 static int apply_r_mips_32(struct module *me, uint32_t *location,
406 static int apply_r_mips_26(struct module *me, uint32_t *location,
410 printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
411 " unaligned relocation\n");
416 * Not desperately convinced this is a good check of an overflow condition
417 * anyway. But it gets in the way of handling undefined weak symbols which
418 * we want to set to zero.
419 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
421 * "module %s: relocation overflow\n",
427 *location = (*location & ~0x03ffffff) |
428 ((*location + (v >> 2)) & 0x03ffffff);
432 static int apply_r_mips_hi16(struct module *me, uint32_t *location,
438 * We cannot relocate this one now because we don't know the value of
439 * the carry we need to add. Save the information, and let LO16 do the
442 n = kmalloc(sizeof *n, GFP_KERNEL);
448 n->next = mips_hi16_list;
454 static int apply_r_mips_lo16(struct module *me, uint32_t *location,
457 unsigned long insnlo = *location;
458 Elf32_Addr val, vallo;
459 struct mips_hi16 *l, *next;
461 /* Sign extend the addend we extract from the lo insn. */
462 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
464 if (mips_hi16_list != NULL) {
471 * The value for the HI16 had best be the same.
474 printk(KERN_DEBUG "VPE loader: "
475 "apply_r_mips_lo16/hi16: \t"
476 "inconsistent value information\n");
481 * Do the HI16 relocation. Note that we actually don't
482 * need to know anything about the LO16 itself, except
483 * where to find the low 16 bits of the addend needed
487 val = ((insn & 0xffff) << 16) + vallo;
491 * Account for the sign extension that will happen in
494 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
496 insn = (insn & ~0xffff) | val;
504 mips_hi16_list = NULL;
508 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
511 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
522 mips_hi16_list = NULL;
527 static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
529 [R_MIPS_NONE] = apply_r_mips_none,
530 [R_MIPS_32] = apply_r_mips_32,
531 [R_MIPS_26] = apply_r_mips_26,
532 [R_MIPS_HI16] = apply_r_mips_hi16,
533 [R_MIPS_LO16] = apply_r_mips_lo16,
534 [R_MIPS_GPREL16] = apply_r_mips_gprel16,
535 [R_MIPS_PC16] = apply_r_mips_pc16
538 static char *rstrs[] = {
539 [R_MIPS_NONE] = "MIPS_NONE",
540 [R_MIPS_32] = "MIPS_32",
541 [R_MIPS_26] = "MIPS_26",
542 [R_MIPS_HI16] = "MIPS_HI16",
543 [R_MIPS_LO16] = "MIPS_LO16",
544 [R_MIPS_GPREL16] = "MIPS_GPREL16",
545 [R_MIPS_PC16] = "MIPS_PC16"
548 static int apply_relocations(Elf32_Shdr *sechdrs,
550 unsigned int symindex,
554 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
561 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
562 Elf32_Word r_info = rel[i].r_info;
564 /* This is where to make the change */
565 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
567 /* This is the symbol it is referring to */
568 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
569 + ELF32_R_SYM(r_info);
571 if (!sym->st_value) {
572 printk(KERN_DEBUG "%s: undefined weak symbol %s\n",
573 me->name, strtab + sym->st_name);
574 /* just print the warning, dont barf */
579 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
581 char *r = rstrs[ELF32_R_TYPE(r_info)];
582 printk(KERN_WARNING "VPE loader: .text+0x%x "
583 "relocation type %s for symbol \"%s\" failed\n",
584 rel[i].r_offset, r ? r : "UNKNOWN",
585 strtab + sym->st_name);
593 static inline void save_gp_address(unsigned int secbase, unsigned int rel)
595 gp_addr = secbase + rel;
596 gp_offs = gp_addr - (secbase & 0xffff0000);
598 /* end module-elf32.c */
602 /* Change all symbols so that sh_value encodes the pointer directly. */
603 static void simplify_symbols(Elf_Shdr * sechdrs,
604 unsigned int symindex,
606 const char *secstrings,
607 unsigned int nsecs, struct module *mod)
609 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
610 unsigned long secbase, bssbase = 0;
611 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
614 /* find the .bss section for COMMON symbols */
615 for (i = 0; i < nsecs; i++) {
616 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) {
617 bssbase = sechdrs[i].sh_addr;
622 for (i = 1; i < n; i++) {
623 switch (sym[i].st_shndx) {
625 /* Allocate space for the symbol in the .bss section.
626 st_value is currently size.
627 We want it to have the address of the symbol. */
629 size = sym[i].st_value;
630 sym[i].st_value = bssbase;
636 /* Don't need to do anything */
643 case SHN_MIPS_SCOMMON:
644 printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON "
645 "symbol <%s> st_shndx %d\n", strtab + sym[i].st_name,
651 secbase = sechdrs[sym[i].st_shndx].sh_addr;
653 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) {
654 save_gp_address(secbase, sym[i].st_value);
657 sym[i].st_value += secbase;
663 #ifdef DEBUG_ELFLOADER
664 static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex,
665 const char *strtab, struct module *mod)
667 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
668 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
670 printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n);
671 for (i = 1; i < n; i++) {
672 printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i,
673 strtab + sym[i].st_name, sym[i].st_value);
678 /* We are prepared so configure and start the VPE... */
679 static int vpe_run(struct vpe * v)
681 unsigned long flags, val, dmt_flag;
682 struct vpe_notifications *n;
683 unsigned int vpeflags;
686 /* check we are the Master VPE */
687 local_irq_save(flags);
688 val = read_c0_vpeconf0();
689 if (!(val & VPECONF0_MVP)) {
691 "VPE loader: only Master VPE's are allowed to configure MT\n");
692 local_irq_restore(flags);
700 if (list_empty(&v->tc)) {
703 local_irq_restore(flags);
706 "VPE loader: No TC's associated with VPE %d\n",
712 t = list_first_entry(&v->tc, struct tc, tc);
714 /* Put MVPE's into 'configuration state' */
715 set_c0_mvpcontrol(MVPCONTROL_VPC);
719 /* should check it is halted, and not activated */
720 if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
723 local_irq_restore(flags);
725 printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
731 /* Write the address we want it to start running from in the TCPC register. */
732 write_tc_c0_tcrestart((unsigned long)v->__start);
733 write_tc_c0_tccontext((unsigned long)0);
736 * Mark the TC as activated, not interrupt exempt and not dynamically
739 val = read_tc_c0_tcstatus();
740 val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;
741 write_tc_c0_tcstatus(val);
743 write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
746 * The sde-kit passes 'memsize' to __start in $a3, so set something
747 * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
748 * DFLT_HEAP_SIZE when you compile your program
751 mttgpr(7, physical_memsize);
755 * bind the TC to VPE 1 as late as possible so we only have the final
756 * VPE registers to set up, and so an EJTAG probe can trigger on it
758 write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
760 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
762 back_to_back_c0_hazard();
764 /* Set up the XTC bit in vpeconf0 to point at our tc */
765 write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
766 | (t->index << VPECONF0_XTC_SHIFT));
768 back_to_back_c0_hazard();
770 /* enable this VPE */
771 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
773 /* clear out any left overs from a previous program */
774 write_vpe_c0_status(0);
775 write_vpe_c0_cause(0);
777 /* take system out of configuration state */
778 clear_c0_mvpcontrol(MVPCONTROL_VPC);
781 * SMTC/SMVP kernels manage VPE enable independently,
782 * but uniprocessor kernels need to turn it on, even
783 * if that wasn't the pre-dvpe() state.
791 local_irq_restore(flags);
793 list_for_each_entry(n, &v->notify, list)
799 static int find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs,
800 unsigned int symindex, const char *strtab,
803 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
804 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
806 for (i = 1; i < n; i++) {
807 if (strcmp(strtab + sym[i].st_name, "__start") == 0) {
808 v->__start = sym[i].st_value;
811 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) {
812 v->shared_ptr = (void *)sym[i].st_value;
816 if ( (v->__start == 0) || (v->shared_ptr == NULL))
823 * Allocates a VPE with some program code space(the load address), copies the
824 * contents of the program (p)buffer performing relocatations/etc, free's it
827 static int vpe_elfload(struct vpe * v)
832 char *secstrings, *strtab = NULL;
833 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0;
834 struct module mod; // so we can re-use the relocations code
836 memset(&mod, 0, sizeof(struct module));
837 strcpy(mod.name, "VPE loader");
839 hdr = (Elf_Ehdr *) v->pbuffer;
842 /* Sanity checks against insmoding binaries or wrong arch,
844 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
845 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
846 || !elf_check_arch(hdr)
847 || hdr->e_shentsize != sizeof(*sechdrs)) {
849 "VPE loader: program wrong arch or weird elf version\n");
854 if (hdr->e_type == ET_REL)
857 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
858 printk(KERN_ERR "VPE loader: program length %u truncated\n",
864 /* Convenience variables */
865 sechdrs = (void *)hdr + hdr->e_shoff;
866 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
867 sechdrs[0].sh_addr = 0;
869 /* And these should exist, but gcc whinges if we don't init them */
870 symindex = strindex = 0;
873 for (i = 1; i < hdr->e_shnum; i++) {
874 if (sechdrs[i].sh_type != SHT_NOBITS
875 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) {
876 printk(KERN_ERR "VPE program length %u truncated\n",
881 /* Mark all sections sh_addr with their address in the
883 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
885 /* Internal symbols and strings. */
886 if (sechdrs[i].sh_type == SHT_SYMTAB) {
888 strindex = sechdrs[i].sh_link;
889 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
892 layout_sections(&mod, hdr, sechdrs, secstrings);
895 v->load_addr = alloc_progmem(mod.core_size);
899 pr_info("VPE loader: loading to %p\n", v->load_addr);
902 for (i = 0; i < hdr->e_shnum; i++) {
905 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
908 dest = v->load_addr + sechdrs[i].sh_entsize;
910 if (sechdrs[i].sh_type != SHT_NOBITS)
911 memcpy(dest, (void *)sechdrs[i].sh_addr,
913 /* Update sh_addr to point to copy in image. */
914 sechdrs[i].sh_addr = (unsigned long)dest;
916 printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
917 secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
920 /* Fix up syms, so that st_value is a pointer to location. */
921 simplify_symbols(sechdrs, symindex, strtab, secstrings,
924 /* Now do relocations. */
925 for (i = 1; i < hdr->e_shnum; i++) {
926 const char *strtab = (char *)sechdrs[strindex].sh_addr;
927 unsigned int info = sechdrs[i].sh_info;
929 /* Not a valid relocation section? */
930 if (info >= hdr->e_shnum)
933 /* Don't bother with non-allocated sections */
934 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
937 if (sechdrs[i].sh_type == SHT_REL)
938 err = apply_relocations(sechdrs, strtab, symindex, i,
940 else if (sechdrs[i].sh_type == SHT_RELA)
941 err = apply_relocate_add(sechdrs, strtab, symindex, i,
948 struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
950 for (i = 0; i < hdr->e_phnum; i++) {
951 if (phdr->p_type == PT_LOAD) {
952 memcpy((void *)phdr->p_paddr,
953 (char *)hdr + phdr->p_offset,
955 memset((void *)phdr->p_paddr + phdr->p_filesz,
956 0, phdr->p_memsz - phdr->p_filesz);
961 for (i = 0; i < hdr->e_shnum; i++) {
962 /* Internal symbols and strings. */
963 if (sechdrs[i].sh_type == SHT_SYMTAB) {
965 strindex = sechdrs[i].sh_link;
966 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
968 /* mark the symtab's address for when we try to find the
970 sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
975 /* make sure it's physically written out */
976 flush_icache_range((unsigned long)v->load_addr,
977 (unsigned long)v->load_addr + v->len);
979 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
980 if (v->__start == 0) {
981 printk(KERN_WARNING "VPE loader: program does not contain "
982 "a __start symbol\n");
986 if (v->shared_ptr == NULL)
987 printk(KERN_WARNING "VPE loader: "
988 "program does not contain vpe_shared symbol.\n"
989 " Unable to use AMVP (AP/SP) facilities.\n");
992 printk(" elf loaded\n");
996 static void cleanup_tc(struct tc *tc)
999 unsigned int mtflags, vpflags;
1002 local_irq_save(flags);
1005 /* Put MVPE's into 'configuration state' */
1006 set_c0_mvpcontrol(MVPCONTROL_VPC);
1009 tmp = read_tc_c0_tcstatus();
1011 /* mark not allocated and not dynamically allocatable */
1012 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1013 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1014 write_tc_c0_tcstatus(tmp);
1016 write_tc_c0_tchalt(TCHALT_H);
1019 /* bind it to anything other than VPE1 */
1020 // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
1022 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1025 local_irq_restore(flags);
1028 static int getcwd(char *buff, int size)
1030 mm_segment_t old_fs;
1036 ret = sys_getcwd(buff, size);
1043 /* checks VPE is unused and gets ready to load program */
1044 static int vpe_open(struct inode *inode, struct file *filp)
1046 enum vpe_state state;
1047 struct vpe_notifications *not;
1051 if (minor != iminor(inode)) {
1052 /* assume only 1 device at the moment. */
1053 pr_warning("VPE loader: only vpe1 is supported\n");
1058 if ((v = get_vpe(tclimit)) == NULL) {
1059 pr_warning("VPE loader: unable to get vpe\n");
1064 state = xchg(&v->state, VPE_STATE_INUSE);
1065 if (state != VPE_STATE_UNUSED) {
1066 printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
1068 list_for_each_entry(not, &v->notify, list) {
1072 release_progmem(v->load_addr);
1073 cleanup_tc(get_tc(tclimit));
1076 /* this of-course trashes what was there before... */
1077 v->pbuffer = vmalloc(P_SIZE);
1079 pr_warning("VPE loader: unable to allocate memory\n");
1083 v->load_addr = NULL;
1086 v->uid = filp->f_cred->fsuid;
1087 v->gid = filp->f_cred->fsgid;
1090 ret = getcwd(v->cwd, VPE_PATH_MAX);
1092 printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
1094 v->shared_ptr = NULL;
1100 static int vpe_release(struct inode *inode, struct file *filp)
1106 v = get_vpe(tclimit);
1110 hdr = (Elf_Ehdr *) v->pbuffer;
1111 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
1112 if (vpe_elfload(v) >= 0) {
1115 printk(KERN_WARNING "VPE loader: ELF load failed.\n");
1119 printk(KERN_WARNING "VPE loader: only elf files are supported\n");
1123 /* It's good to be able to run the SP and if it chokes have a look at
1124 the /dev/rt?. But if we reset the pointer to the shared struct we
1125 lose what has happened. So perhaps if garbage is sent to the vpe
1126 device, use it as a trigger for the reset. Hopefully a nice
1127 executable will be along shortly. */
1129 v->shared_ptr = NULL;
1137 static ssize_t vpe_write(struct file *file, const char __user * buffer,
1138 size_t count, loff_t * ppos)
1143 if (iminor(file_inode(file)) != minor)
1146 v = get_vpe(tclimit);
1150 if ((count + v->len) > v->plen) {
1152 "VPE loader: elf size too big. Perhaps strip uneeded symbols\n");
1156 count -= copy_from_user(v->pbuffer + v->len, buffer, count);
1164 static const struct file_operations vpe_fops = {
1165 .owner = THIS_MODULE,
1167 .release = vpe_release,
1169 .llseek = noop_llseek,
1172 /* module wrapper entry points */
1174 vpe_handle vpe_alloc(void)
1180 for (i = 1; i < MAX_VPES; i++) {
1181 if ((v = get_vpe(i)) != NULL) {
1182 v->state = VPE_STATE_INUSE;
1189 EXPORT_SYMBOL(vpe_alloc);
1191 /* start running from here */
1192 int vpe_start(vpe_handle vpe, unsigned long start)
1194 struct vpe *v = vpe;
1200 EXPORT_SYMBOL(vpe_start);
1202 /* halt it for now */
1203 int vpe_stop(vpe_handle vpe)
1205 struct vpe *v = vpe;
1207 unsigned int evpe_flags;
1209 evpe_flags = dvpe();
1211 if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) {
1214 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1222 EXPORT_SYMBOL(vpe_stop);
1224 /* I've done with it thank you */
1225 int vpe_free(vpe_handle vpe)
1227 struct vpe *v = vpe;
1229 unsigned int evpe_flags;
1231 if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
1235 evpe_flags = dvpe();
1237 /* Put MVPE's into 'configuration state' */
1238 set_c0_mvpcontrol(MVPCONTROL_VPC);
1241 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
1244 write_tc_c0_tchalt(TCHALT_H);
1247 /* mark the TC unallocated */
1248 write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
1250 v->state = VPE_STATE_UNUSED;
1252 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1258 EXPORT_SYMBOL(vpe_free);
1260 void *vpe_get_shared(int index)
1264 if ((v = get_vpe(index)) == NULL)
1267 return v->shared_ptr;
1270 EXPORT_SYMBOL(vpe_get_shared);
1272 int vpe_getuid(int index)
1276 if ((v = get_vpe(index)) == NULL)
1282 EXPORT_SYMBOL(vpe_getuid);
1284 int vpe_getgid(int index)
1288 if ((v = get_vpe(index)) == NULL)
1294 EXPORT_SYMBOL(vpe_getgid);
1296 int vpe_notify(int index, struct vpe_notifications *notify)
1300 if ((v = get_vpe(index)) == NULL)
1303 list_add(¬ify->list, &v->notify);
1307 EXPORT_SYMBOL(vpe_notify);
1309 char *vpe_getcwd(int index)
1313 if ((v = get_vpe(index)) == NULL)
1319 EXPORT_SYMBOL(vpe_getcwd);
1321 static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
1322 const char *buf, size_t len)
1324 struct vpe *vpe = get_vpe(tclimit);
1325 struct vpe_notifications *not;
1327 list_for_each_entry(not, &vpe->notify, list) {
1331 release_progmem(vpe->load_addr);
1332 cleanup_tc(get_tc(tclimit));
1338 static DEVICE_ATTR(kill, S_IWUSR, NULL, store_kill);
1340 static ssize_t ntcs_show(struct device *cd, struct device_attribute *attr,
1343 struct vpe *vpe = get_vpe(tclimit);
1345 return sprintf(buf, "%d\n", vpe->ntcs);
1348 static ssize_t ntcs_store(struct device *dev, struct device_attribute *attr,
1349 const char *buf, size_t len)
1351 struct vpe *vpe = get_vpe(tclimit);
1355 new = simple_strtoul(buf, &endp, 0);
1359 if (new == 0 || new > (hw_tcs - tclimit))
1369 static DEVICE_ATTR_RW(ntcs);
1371 static struct attribute *vpe_attrs[] = {
1372 &dev_attr_kill.attr,
1373 &dev_attr_ntcs.attr,
1376 ATTRIBUTE_GROUPS(vpe);
1378 static void vpe_device_release(struct device *cd)
1383 struct class vpe_class = {
1385 .owner = THIS_MODULE,
1386 .dev_release = vpe_device_release,
1387 .dev_groups = vpe_groups,
1390 struct device vpe_device;
1392 static int __init vpe_module_init(void)
1394 unsigned int mtflags, vpflags;
1395 unsigned long flags, val;
1396 struct vpe *v = NULL;
1400 if (!cpu_has_mipsmt) {
1401 printk("VPE loader: not a MIPS MT capable processor\n");
1405 if (vpelimit == 0) {
1406 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
1407 "initializing VPE loader.\nPass maxvpes=<n> argument as "
1408 "kernel argument\n");
1414 printk(KERN_WARNING "No TCs reserved for AP/SP, not "
1415 "initializing VPE loader.\nPass maxtcs=<n> argument as "
1416 "kernel argument\n");
1421 major = register_chrdev(0, module_name, &vpe_fops);
1423 printk("VPE loader: unable to register character device\n");
1427 err = class_register(&vpe_class);
1429 printk(KERN_ERR "vpe_class registration failed\n");
1433 device_initialize(&vpe_device);
1434 vpe_device.class = &vpe_class,
1435 vpe_device.parent = NULL,
1436 dev_set_name(&vpe_device, "vpe1");
1437 vpe_device.devt = MKDEV(major, minor);
1438 err = device_add(&vpe_device);
1440 printk(KERN_ERR "Adding vpe_device failed\n");
1444 local_irq_save(flags);
1448 /* Put MVPE's into 'configuration state' */
1449 set_c0_mvpcontrol(MVPCONTROL_VPC);
1451 /* dump_mtregs(); */
1453 val = read_c0_mvpconf0();
1454 hw_tcs = (val & MVPCONF0_PTC) + 1;
1455 hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
1457 for (tc = tclimit; tc < hw_tcs; tc++) {
1459 * Must re-enable multithreading temporarily or in case we
1460 * reschedule send IPIs or similar we might hang.
1462 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1465 local_irq_restore(flags);
1472 local_irq_save(flags);
1475 set_c0_mvpcontrol(MVPCONTROL_VPC);
1481 if ((v = alloc_vpe(tc)) == NULL) {
1482 printk(KERN_WARNING "VPE: unable to allocate VPE\n");
1487 v->ntcs = hw_tcs - tclimit;
1489 /* add the tc to the list of this vpe's tc's. */
1490 list_add(&t->tc, &v->tc);
1492 /* deactivate all but vpe0 */
1493 if (tc >= tclimit) {
1494 unsigned long tmp = read_vpe_c0_vpeconf0();
1496 tmp &= ~VPECONF0_VPA;
1499 tmp |= VPECONF0_MVP;
1500 write_vpe_c0_vpeconf0(tmp);
1503 /* disable multi-threading with TC's */
1504 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
1506 if (tc >= vpelimit) {
1508 * Set config to be the same as vpe0,
1509 * particularly kseg0 coherency alg
1511 write_vpe_c0_config(read_c0_config());
1516 t->pvpe = v; /* set the parent vpe */
1518 if (tc >= tclimit) {
1523 /* Any TC that is bound to VPE0 gets left as is - in case
1524 we are running SMTC on VPE0. A TC that is bound to any
1525 other VPE gets bound to VPE0, ideally I'd like to make
1526 it homeless but it doesn't appear to let me bind a TC
1527 to a non-existent VPE. Which is perfectly reasonable.
1529 The (un)bound state is visible to an EJTAG probe so may
1533 if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
1534 /* tc is bound >vpe0 */
1535 write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
1537 t->pvpe = get_vpe(0); /* set the parent vpe */
1541 write_tc_c0_tchalt(TCHALT_H);
1544 tmp = read_tc_c0_tcstatus();
1546 /* mark not activated and not dynamically allocatable */
1547 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
1548 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
1549 write_tc_c0_tcstatus(tmp);
1554 /* release config state */
1555 clear_c0_mvpcontrol(MVPCONTROL_VPC);
1559 local_irq_restore(flags);
1564 class_unregister(&vpe_class);
1566 unregister_chrdev(major, module_name);
1572 static void __exit vpe_module_exit(void)
1576 device_del(&vpe_device);
1577 unregister_chrdev(major, module_name);
1579 /* No locking needed here */
1580 list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
1581 if (v->state != VPE_STATE_UNUSED)
1586 module_init(vpe_module_init);
1587 module_exit(vpe_module_exit);
1588 MODULE_DESCRIPTION("MIPS VPE Loader");
1589 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
1590 MODULE_LICENSE("GPL");