/* * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * */ /* * VPE support module * * Provides support for loading a MIPS SP program on VPE1. * The SP enviroment is rather simple, no tlb's. It needs to be relocatable * (or partially linked). You should initialise your stack in the startup * code. This loader looks for the symbol __start and sets up * execution to resume from there. The MIPS SDE kit contains suitable examples. * * To load and run, simply cat a SP 'program file' to /dev/vpe1. * i.e cat spapp >/dev/vpe1. * * You'll need to have the following device files. * mknod /dev/vpe0 c 63 0 * mknod /dev/vpe1 c 63 1 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include typedef void *vpe_handle; #ifndef ARCH_SHF_SMALL #define ARCH_SHF_SMALL 0 #endif /* If this is set, the section belongs in the init part of the module */ #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) static char module_name[] = "vpe"; static int major; /* grab the likely amount of memory we will need. */ #ifdef CONFIG_MIPS_VPE_LOADER_TOM #define P_SIZE (2 * 1024 * 1024) #else /* add an overhead to the max kmalloc size for non-striped symbols/etc */ #define P_SIZE (256 * 1024) #endif #define MAX_VPES 16 enum vpe_state { VPE_STATE_UNUSED = 0, VPE_STATE_INUSE, VPE_STATE_RUNNING }; enum tc_state { TC_STATE_UNUSED = 0, TC_STATE_INUSE, TC_STATE_RUNNING, TC_STATE_DYNAMIC }; struct vpe { enum vpe_state state; /* (device) minor associated with this vpe */ int minor; /* elfloader stuff */ void *load_addr; unsigned long len; char *pbuffer; unsigned long plen; unsigned long __start; /* tc's associated with this vpe */ struct list_head tc; /* The list of vpe's */ struct list_head list; /* shared symbol address */ void *shared_ptr; }; struct tc { enum tc_state state; int index; /* parent VPE */ struct vpe *pvpe; /* The list of TC's with this VPE */ struct list_head tc; /* The global list of tc's */ struct list_head list; }; struct vpecontrol_ { /* Virtual processing elements */ struct list_head vpe_list; /* Thread contexts */ struct list_head tc_list; } vpecontrol; static void release_progmem(void *ptr); static void dump_vpe(struct vpe * v); extern void save_gp_address(unsigned int secbase, unsigned int rel); /* get the vpe associated with this minor */ struct vpe *get_vpe(int minor) { struct vpe *v; list_for_each_entry(v, &vpecontrol.vpe_list, list) { if (v->minor == minor) return v; } printk(KERN_DEBUG "VPE: get_vpe minor %d not found\n", minor); return NULL; } /* get the vpe associated with this minor */ struct tc *get_tc(int index) { struct tc *t; list_for_each_entry(t, &vpecontrol.tc_list, list) { if (t->index == index) return t; } printk(KERN_DEBUG "VPE: get_tc index %d not found\n", index); return NULL; } struct tc *get_tc_unused(void) { struct tc *t; list_for_each_entry(t, &vpecontrol.tc_list, list) { if (t->state == TC_STATE_UNUSED) return t; } printk(KERN_DEBUG "VPE: All TC's are in use\n"); return NULL; } /* allocate a vpe and associate it with this minor (or index) */ struct vpe *alloc_vpe(int minor) { struct vpe *v; if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) { printk(KERN_WARNING "VPE: alloc_vpe no mem\n"); return NULL; } INIT_LIST_HEAD(&v->tc); list_add_tail(&v->list, &vpecontrol.vpe_list); v->minor = minor; return v; } /* allocate a tc. At startup only tc0 is running, all other can be halted. */ struct tc *alloc_tc(int index) { struct tc *t; if ((t = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL) { printk(KERN_WARNING "VPE: alloc_tc no mem\n"); return NULL; } INIT_LIST_HEAD(&t->tc); list_add_tail(&t->list, &vpecontrol.tc_list); t->index = index; return t; } /* clean up and free everything */ void release_vpe(struct vpe *v) { list_del(&v->list); if (v->load_addr) release_progmem(v); kfree(v); } void dump_mtregs(void) { unsigned long val; val = read_c0_config3(); printk("config3 0x%lx MT %ld\n", val, (val & CONFIG3_MT) >> CONFIG3_MT_SHIFT); val = read_c0_mvpconf0(); printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val, (val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT, val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT); val = read_c0_mvpcontrol(); printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val, (val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT, (val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT, (val & MVPCONTROL_EVP)); val = read_c0_vpeconf0(); printk("VPEConf0 0x%lx MVP %ld\n", val, (val & VPECONF0_MVP) >> VPECONF0_MVP_SHIFT); } /* Find some VPE program space */ static void *alloc_progmem(unsigned long len) { #ifdef CONFIG_MIPS_VPE_LOADER_TOM /* this means you must tell linux to use less memory than you physically have */ return pfn_to_kaddr(max_pfn); #else // simple grab some mem for now return kmalloc(len, GFP_KERNEL); #endif } static void release_progmem(void *ptr) { #ifndef CONFIG_MIPS_VPE_LOADER_TOM kfree(ptr); #endif } /* Update size with this section: return offset. */ static long get_offset(unsigned long *size, Elf_Shdr * sechdr) { long ret; ret = ALIGN(*size, sechdr->sh_addralign ? : 1); *size = ret + sechdr->sh_size; return ret; } /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld might -- code, read-only data, read-write data, small data. Tally sizes, and place the offsets into sh_entsize fields: high bit means it belongs in init. */ static void layout_sections(struct module *mod, const Elf_Ehdr * hdr, Elf_Shdr * sechdrs, const char *secstrings) { static unsigned long const masks[][2] = { /* NOTE: all executable code must be the first section * in this array; otherwise modify the text_size * finder in the two loops below */ {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL}, {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL}, {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL}, {ARCH_SHF_SMALL | SHF_ALLOC, 0} }; unsigned int m, i; for (i = 0; i < hdr->e_shnum; i++) sechdrs[i].sh_entsize = ~0UL; for (m = 0; m < ARRAY_SIZE(masks); ++m) { for (i = 0; i < hdr->e_shnum; ++i) { Elf_Shdr *s = &sechdrs[i]; // || strncmp(secstrings + s->sh_name, ".init", 5) == 0) if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL) continue; s->sh_entsize = get_offset(&mod->core_size, s); } if (m == 0) mod->core_text_size = mod->core_size; } } /* from module-elf32.c, but subverted a little */ struct mips_hi16 { struct mips_hi16 *next; Elf32_Addr *addr; Elf32_Addr value; }; static struct mips_hi16 *mips_hi16_list; static unsigned int gp_offs, gp_addr; static int apply_r_mips_none(struct module *me, uint32_t *location, Elf32_Addr v) { return 0; } static int apply_r_mips_gprel16(struct module *me, uint32_t *location, Elf32_Addr v) { int rel; if( !(*location & 0xffff) ) { rel = (int)v - gp_addr; } else { /* .sbss + gp(relative) + offset */ /* kludge! */ rel = (int)(short)((int)v + gp_offs + (int)(short)(*location & 0xffff) - gp_addr); } if( (rel > 32768) || (rel < -32768) ) { printk(KERN_ERR "apply_r_mips_gprel16: relative address out of range 0x%x %d\n", rel, rel); return -ENOEXEC; } *location = (*location & 0xffff0000) | (rel & 0xffff); return 0; } static int apply_r_mips_pc16(struct module *me, uint32_t *location, Elf32_Addr v) { int rel; rel = (((unsigned int)v - (unsigned int)location)); rel >>= 2; // because the offset is in _instructions_ not bytes. rel -= 1; // and one instruction less due to the branch delay slot. if( (rel > 32768) || (rel < -32768) ) { printk(KERN_ERR "apply_r_mips_pc16: relative address out of range 0x%x\n", rel); return -ENOEXEC; } *location = (*location & 0xffff0000) | (rel & 0xffff); return 0; } static int apply_r_mips_32(struct module *me, uint32_t *location, Elf32_Addr v) { *location += v; return 0; } static int apply_r_mips_26(struct module *me, uint32_t *location, Elf32_Addr v) { if (v % 4) { printk(KERN_ERR "module %s: dangerous relocation mod4\n", me->name); return -ENOEXEC; } /* * Not desperately convinced this is a good check of an overflow condition * anyway. But it gets in the way of handling undefined weak symbols which * we want to set to zero. * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { * printk(KERN_ERR * "module %s: relocation overflow\n", * me->name); * return -ENOEXEC; * } */ *location = (*location & ~0x03ffffff) | ((*location + (v >> 2)) & 0x03ffffff); return 0; } static int apply_r_mips_hi16(struct module *me, uint32_t *location, Elf32_Addr v) { struct mips_hi16 *n; /* * We cannot relocate this one now because we don't know the value of * the carry we need to add. Save the information, and let LO16 do the * actual relocation. */ n = kmalloc(sizeof *n, GFP_KERNEL); if (!n) return -ENOMEM; n->addr = location; n->value = v; n->next = mips_hi16_list; mips_hi16_list = n; return 0; } static int apply_r_mips_lo16(struct module *me, uint32_t *location, Elf32_Addr v) { unsigned long insnlo = *location; Elf32_Addr val, vallo; /* Sign extend the addend we extract from the lo insn. */ vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; if (mips_hi16_list != NULL) { struct mips_hi16 *l; l = mips_hi16_list; while (l != NULL) { struct mips_hi16 *next; unsigned long insn; /* * The value for the HI16 had best be the same. */ if (v != l->value) { printk("%d != %d\n", v, l->value); goto out_danger; } /* * Do the HI16 relocation. Note that we actually don't * need to know anything about the LO16 itself, except * where to find the low 16 bits of the addend needed * by the LO16. */ insn = *l->addr; val = ((insn & 0xffff) << 16) + vallo; val += v; /* * Account for the sign extension that will happen in * the low bits. */ val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; insn = (insn & ~0xffff) | val; *l->addr = insn; next = l->next; kfree(l); l = next; } mips_hi16_list = NULL; } /* * Ok, we're done with the HI16 relocs. Now deal with the LO16. */ val = v + vallo; insnlo = (insnlo & ~0xffff) | (val & 0xffff); *location = insnlo; return 0; out_danger: printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name); return -ENOEXEC; } static int (*reloc_handlers[]) (struct module *me, uint32_t *location, Elf32_Addr v) = { [R_MIPS_NONE] = apply_r_mips_none, [R_MIPS_32] = apply_r_mips_32, [R_MIPS_26] = apply_r_mips_26, [R_MIPS_HI16] = apply_r_mips_hi16, [R_MIPS_LO16] = apply_r_mips_lo16, [R_MIPS_GPREL16] = apply_r_mips_gprel16, [R_MIPS_PC16] = apply_r_mips_pc16 }; int apply_relocations(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me) { Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr; Elf32_Sym *sym; uint32_t *location; unsigned int i; Elf32_Addr v; int res; for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { Elf32_Word r_info = rel[i].r_info; /* This is where to make the change */ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; /* This is the symbol it is referring to */ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + ELF32_R_SYM(r_info); if (!sym->st_value) { printk(KERN_DEBUG "%s: undefined weak symbol %s\n", me->name, strtab + sym->st_name); /* just print the warning, dont barf */ } v = sym->st_value; res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v); if( res ) { printk(KERN_DEBUG "relocation error 0x%x sym refer <%s> value 0x%x " "type 0x%x r_info 0x%x\n", (unsigned int)location, strtab + sym->st_name, v, r_info, ELF32_R_TYPE(r_info)); } if (res) return res; } return 0; } void save_gp_address(unsigned int secbase, unsigned int rel) { gp_addr = secbase + rel; gp_offs = gp_addr - (secbase & 0xffff0000); } /* end module-elf32.c */ /* Change all symbols so that sh_value encodes the pointer directly. */ static int simplify_symbols(Elf_Shdr * sechdrs, unsigned int symindex, const char *strtab, const char *secstrings, unsigned int nsecs, struct module *mod) { Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; unsigned long secbase, bssbase = 0; unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); int ret = 0, size; /* find the .bss section for COMMON symbols */ for (i = 0; i < nsecs; i++) { if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) bssbase = sechdrs[i].sh_addr; } for (i = 1; i < n; i++) { switch (sym[i].st_shndx) { case SHN_COMMON: /* Allocate space for the symbol in the .bss section. st_value is currently size. We want it to have the address of the symbol. */ size = sym[i].st_value; sym[i].st_value = bssbase; bssbase += size; break; case SHN_ABS: /* Don't need to do anything */ break; case SHN_UNDEF: /* ret = -ENOENT; */ break; case SHN_MIPS_SCOMMON: printk(KERN_DEBUG "simplify_symbols: ignoring SHN_MIPS_SCOMMON symbol <%s> st_shndx %d\n", strtab + sym[i].st_name, sym[i].st_shndx); // .sbss section break; default: secbase = sechdrs[sym[i].st_shndx].sh_addr; if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) { save_gp_address(secbase, sym[i].st_value); } sym[i].st_value += secbase; break; } } return ret; } #ifdef DEBUG_ELFLOADER static void dump_elfsymbols(Elf_Shdr * sechdrs, unsigned int symindex, const char *strtab, struct module *mod) { Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); printk(KERN_DEBUG "dump_elfsymbols: n %d\n", n); for (i = 1; i < n; i++) { printk(KERN_DEBUG " i %d name <%s> 0x%x\n", i, strtab + sym[i].st_name, sym[i].st_value); } } #endif static void dump_tc(struct tc *t) { printk(KERN_WARNING "VPE: TC index %d TCStatus 0x%lx halt 0x%lx\n", t->index, read_tc_c0_tcstatus(), read_tc_c0_tchalt()); printk(KERN_WARNING "VPE: tcrestart 0x%lx\n", read_tc_c0_tcrestart()); } static void dump_tclist(void) { struct tc *t; list_for_each_entry(t, &vpecontrol.tc_list, list) { dump_tc(t); } } /* We are prepared so configure and start the VPE... */ int vpe_run(struct vpe * v) { unsigned long val; struct tc *t; /* check we are the Master VPE */ val = read_c0_vpeconf0(); if (!(val & VPECONF0_MVP)) { printk(KERN_WARNING "VPE: only Master VPE's are allowed to configure MT\n"); return -1; } /* disable MT (using dvpe) */ dvpe(); /* Put MVPE's into 'configuration state' */ set_c0_mvpcontrol(MVPCONTROL_VPC); if (!list_empty(&v->tc)) { if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { printk(KERN_WARNING "VPE: TC %d is already in use.\n", t->index); return -ENOEXEC; } } else { printk(KERN_WARNING "VPE: No TC's associated with VPE %d\n", v->minor); return -ENOEXEC; } settc(t->index); val = read_vpe_c0_vpeconf0(); /* should check it is halted, and not activated */ if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) { printk(KERN_WARNING "VPE: TC %d is already doing something!\n", t->index); dump_tclist(); return -ENOEXEC; } /* Write the address we want it to start running from in the TCPC register. */ write_tc_c0_tcrestart((unsigned long)v->__start); /* write the sivc_info address to tccontext */ write_tc_c0_tccontext((unsigned long)0); /* Set up the XTC bit in vpeconf0 to point at our tc */ write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (t->index << VPECONF0_XTC_SHIFT)); /* mark the TC as activated, not interrupt exempt and not dynamically allocatable */ val = read_tc_c0_tcstatus(); val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A; write_tc_c0_tcstatus(val); write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H); /* set up VPE1 */ write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); // no multiple TC's write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); // enable this VPE /* * The sde-kit passes 'memsize' to __start in $a3, so set something * here... * Or set $a3 (register 7) to zero and define DFLT_STACK_SIZE and * DFLT_HEAP_SIZE when you compile your program */ mttgpr(7, 0); /* set config to be the same as vpe0, particularly kseg0 coherency alg */ write_vpe_c0_config(read_c0_config()); /* clear out any left overs from a previous program */ write_vpe_c0_cause(0); /* take system out of configuration state */ clear_c0_mvpcontrol(MVPCONTROL_VPC); /* clear interrupts enabled IE, ERL, EXL, and KSU from c0 status */ write_vpe_c0_status(read_vpe_c0_status() & ~(ST0_ERL | ST0_KSU | ST0_IE | ST0_EXL)); /* set it running */ evpe(EVPE_ENABLE); return 0; } static unsigned long find_vpe_symbols(struct vpe * v, Elf_Shdr * sechdrs, unsigned int symindex, const char *strtab, struct module *mod) { Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); for (i = 1; i < n; i++) { if (strcmp(strtab + sym[i].st_name, "__start") == 0) { v->__start = sym[i].st_value; } if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) { v->shared_ptr = (void *)sym[i].st_value; } } return 0; } /* * Allocates a VPE with some program code space(the load address), copies * the contents of the program (p)buffer performing relocatations/etc, * free's it when finished. */ int vpe_elfload(struct vpe * v) { Elf_Ehdr *hdr; Elf_Shdr *sechdrs; long err = 0; char *secstrings, *strtab = NULL; unsigned int len, i, symindex = 0, strindex = 0; struct module mod; // so we can re-use the relocations code memset(&mod, 0, sizeof(struct module)); strcpy(mod.name, "VPE dummy prog module"); hdr = (Elf_Ehdr *) v->pbuffer; len = v->plen; /* Sanity checks against insmoding binaries or wrong arch, weird elf version */ if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 || hdr->e_type != ET_REL || !elf_check_arch(hdr) || hdr->e_shentsize != sizeof(*sechdrs)) { printk(KERN_WARNING "VPE program, wrong arch or weird elf version\n"); return -ENOEXEC; } if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { printk(KERN_ERR "VPE program length %u truncated\n", len); return -ENOEXEC; } /* Convenience variables */ sechdrs = (void *)hdr + hdr->e_shoff; secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; sechdrs[0].sh_addr = 0; /* And these should exist, but gcc whinges if we don't init them */ symindex = strindex = 0; for (i = 1; i < hdr->e_shnum; i++) { if (sechdrs[i].sh_type != SHT_NOBITS && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) { printk(KERN_ERR "VPE program length %u truncated\n", len); return -ENOEXEC; } /* Mark all sections sh_addr with their address in the temporary image. */ sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset; /* Internal symbols and strings. */ if (sechdrs[i].sh_type == SHT_SYMTAB) { symindex = i; strindex = sechdrs[i].sh_link; strtab = (char *)hdr + sechdrs[strindex].sh_offset; } } layout_sections(&mod, hdr, sechdrs, secstrings); v->load_addr = alloc_progmem(mod.core_size); memset(v->load_addr, 0, mod.core_size); printk("VPE elf_loader: loading to %p\n", v->load_addr); for (i = 0; i < hdr->e_shnum; i++) { void *dest; if (!(sechdrs[i].sh_flags & SHF_ALLOC)) continue; dest = v->load_addr + sechdrs[i].sh_entsize; if (sechdrs[i].sh_type != SHT_NOBITS) memcpy(dest, (void *)sechdrs[i].sh_addr, sechdrs[i].sh_size); /* Update sh_addr to point to copy in image. */ sechdrs[i].sh_addr = (unsigned long)dest; } /* Fix up syms, so that st_value is a pointer to location. */ err = simplify_symbols(sechdrs, symindex, strtab, secstrings, hdr->e_shnum, &mod); if (err < 0) { printk(KERN_WARNING "VPE: unable to simplify symbols\n"); goto cleanup; } /* Now do relocations. */ for (i = 1; i < hdr->e_shnum; i++) { const char *strtab = (char *)sechdrs[strindex].sh_addr; unsigned int info = sechdrs[i].sh_info; /* Not a valid relocation section? */ if (info >= hdr->e_shnum) continue; /* Don't bother with non-allocated sections */ if (!(sechdrs[info].sh_flags & SHF_ALLOC)) continue; if (sechdrs[i].sh_type == SHT_REL) err = apply_relocations(sechdrs, strtab, symindex, i, &mod); else if (sechdrs[i].sh_type == SHT_RELA) err = apply_relocate_add(sechdrs, strtab, symindex, i, &mod); if (err < 0) { printk(KERN_WARNING "vpe_elfload: error in relocations err %ld\n", err); goto cleanup; } } /* make sure it's physically written out */ flush_icache_range((unsigned long)v->load_addr, (unsigned long)v->load_addr + v->len); if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) { printk(KERN_WARNING "VPE: program doesn't contain __start or vpe_shared symbols\n"); err = -ENOEXEC; } printk(" elf loaded\n"); cleanup: return err; } static void dump_vpe(struct vpe * v) { struct tc *t; printk(KERN_DEBUG "VPEControl 0x%lx\n", read_vpe_c0_vpecontrol()); printk(KERN_DEBUG "VPEConf0 0x%lx\n", read_vpe_c0_vpeconf0()); list_for_each_entry(t, &vpecontrol.tc_list, list) { dump_tc(t); } } /* checks for VPE is unused and gets ready to load program */ static int vpe_open(struct inode *inode, struct file *filp) { int minor; struct vpe *v; /* assume only 1 device at the mo. */ if ((minor = MINOR(inode->i_rdev)) != 1) { printk(KERN_WARNING "VPE: only vpe1 is supported\n"); return -ENODEV; } if ((v = get_vpe(minor)) == NULL) { printk(KERN_WARNING "VPE: unable to get vpe\n"); return -ENODEV; } if (v->state != VPE_STATE_UNUSED) { unsigned long tmp; struct tc *t; printk(KERN_WARNING "VPE: device %d already in use\n", minor); dvpe(); dump_vpe(v); printk(KERN_WARNING "VPE: re-initialising %d\n", minor); release_progmem(v->load_addr); t = get_tc(minor); settc(minor); tmp = read_tc_c0_tcstatus(); /* mark not allocated and not dynamically allocatable */ tmp &= ~(TCSTATUS_A | TCSTATUS_DA); tmp |= TCSTATUS_IXMT; /* interrupt exempt */ write_tc_c0_tcstatus(tmp); write_tc_c0_tchalt(TCHALT_H); } // allocate it so when we get write ops we know it's expected. v->state = VPE_STATE_INUSE; /* this of-course trashes what was there before... */ v->pbuffer = vmalloc(P_SIZE); v->plen = P_SIZE; v->load_addr = NULL; v->len = 0; return 0; } static int vpe_release(struct inode *inode, struct file *filp) { int minor, ret = 0; struct vpe *v; Elf_Ehdr *hdr; minor = MINOR(inode->i_rdev); if ((v = get_vpe(minor)) == NULL) return -ENODEV; // simple case of fire and forget, so tell the VPE to run... hdr = (Elf_Ehdr *) v->pbuffer; if (memcmp(hdr->e_ident, ELFMAG, 4) == 0) { if (vpe_elfload(v) >= 0) vpe_run(v); else { printk(KERN_WARNING "VPE: ELF load failed.\n"); ret = -ENOEXEC; } } else { printk(KERN_WARNING "VPE: only elf files are supported\n"); ret = -ENOEXEC; } // cleanup any temp buffers if (v->pbuffer) vfree(v->pbuffer); v->plen = 0; return ret; } static ssize_t vpe_write(struct file *file, const char __user * buffer, size_t count, loff_t * ppos) { int minor; size_t ret = count; struct vpe *v; minor = MINOR(file->f_dentry->d_inode->i_rdev); if ((v = get_vpe(minor)) == NULL) return -ENODEV; if (v->pbuffer == NULL) { printk(KERN_ERR "vpe_write: no pbuffer\n"); return -ENOMEM; } if ((count + v->len) > v->plen) { printk(KERN_WARNING "VPE Loader: elf size too big. Perhaps strip uneeded symbols\n"); return -ENOMEM; } count -= copy_from_user(v->pbuffer + v->len, buffer, count); if (!count) { printk("vpe_write: copy_to_user failed\n"); return -EFAULT; } v->len += count; return ret; } static struct file_operations vpe_fops = { .owner = THIS_MODULE, .open = vpe_open, .release = vpe_release, .write = vpe_write }; /* module wrapper entry points */ /* give me a vpe */ vpe_handle vpe_alloc(void) { int i; struct vpe *v; /* find a vpe */ for (i = 1; i < MAX_VPES; i++) { if ((v = get_vpe(i)) != NULL) { v->state = VPE_STATE_INUSE; return v; } } return NULL; } EXPORT_SYMBOL(vpe_alloc); /* start running from here */ int vpe_start(vpe_handle vpe, unsigned long start) { struct vpe *v = vpe; v->__start = start; return vpe_run(v); } EXPORT_SYMBOL(vpe_start); /* halt it for now */ int vpe_stop(vpe_handle vpe) { struct vpe *v = vpe; struct tc *t; unsigned int evpe_flags; evpe_flags = dvpe(); if ((t = list_entry(v->tc.next, struct tc, tc)) != NULL) { settc(t->index); write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); } evpe(evpe_flags); return 0; } EXPORT_SYMBOL(vpe_stop); /* I've done with it thank you */ int vpe_free(vpe_handle vpe) { struct vpe *v = vpe; struct tc *t; unsigned int evpe_flags; if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) { return -ENOEXEC; } evpe_flags = dvpe(); /* Put MVPE's into 'configuration state' */ set_c0_mvpcontrol(MVPCONTROL_VPC); settc(t->index); write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); /* mark the TC unallocated and halt'ed */ write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A); write_tc_c0_tchalt(TCHALT_H); v->state = VPE_STATE_UNUSED; clear_c0_mvpcontrol(MVPCONTROL_VPC); evpe(evpe_flags); return 0; } EXPORT_SYMBOL(vpe_free); void *vpe_get_shared(int index) { struct vpe *v; if ((v = get_vpe(index)) == NULL) { printk(KERN_WARNING "vpe: invalid vpe index %d\n", index); return NULL; } return v->shared_ptr; } EXPORT_SYMBOL(vpe_get_shared); static int __init vpe_module_init(void) { struct vpe *v = NULL; struct tc *t; unsigned long val; int i; if (!cpu_has_mipsmt) { printk("VPE loader: not a MIPS MT capable processor\n"); return -ENODEV; } major = register_chrdev(0, module_name, &vpe_fops); if (major < 0) { printk("VPE loader: unable to register character device\n"); return major; } dmt(); dvpe(); /* Put MVPE's into 'configuration state' */ set_c0_mvpcontrol(MVPCONTROL_VPC); /* dump_mtregs(); */ INIT_LIST_HEAD(&vpecontrol.vpe_list); INIT_LIST_HEAD(&vpecontrol.tc_list); val = read_c0_mvpconf0(); for (i = 0; i < ((val & MVPCONF0_PTC) + 1); i++) { t = alloc_tc(i); /* VPE's */ if (i < ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1) { settc(i); if ((v = alloc_vpe(i)) == NULL) { printk(KERN_WARNING "VPE: unable to allocate VPE\n"); return -ENODEV; } list_add(&t->tc, &v->tc); /* add the tc to the list of this vpe's tc's. */ /* deactivate all but vpe0 */ if (i != 0) { unsigned long tmp = read_vpe_c0_vpeconf0(); tmp &= ~VPECONF0_VPA; /* master VPE */ tmp |= VPECONF0_MVP; write_vpe_c0_vpeconf0(tmp); } /* disable multi-threading with TC's */ write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); if (i != 0) { write_vpe_c0_status((read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0); /* set config to be the same as vpe0, particularly kseg0 coherency alg */ write_vpe_c0_config(read_c0_config()); } } /* TC's */ t->pvpe = v; /* set the parent vpe */ if (i != 0) { unsigned long tmp; /* tc 0 will of course be running.... */ if (i == 0) t->state = TC_STATE_RUNNING; settc(i); /* bind a TC to each VPE, May as well put all excess TC's on the last VPE */ if (i >= (((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1)) write_tc_c0_tcbind(read_tc_c0_tcbind() | ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)); else write_tc_c0_tcbind(read_tc_c0_tcbind() | i); tmp = read_tc_c0_tcstatus(); /* mark not allocated and not dynamically allocatable */ tmp &= ~(TCSTATUS_A | TCSTATUS_DA); tmp |= TCSTATUS_IXMT; /* interrupt exempt */ write_tc_c0_tcstatus(tmp); write_tc_c0_tchalt(TCHALT_H); } } /* release config state */ clear_c0_mvpcontrol(MVPCONTROL_VPC); return 0; } static void __exit vpe_module_exit(void) { struct vpe *v, *n; list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) { if (v->state != VPE_STATE_UNUSED) { release_vpe(v); } } unregister_chrdev(major, module_name); } module_init(vpe_module_init); module_exit(vpe_module_exit); MODULE_DESCRIPTION("MIPS VPE Loader"); MODULE_AUTHOR("Elizabeth Clarke, MIPS Technologies, Inc"); MODULE_LICENSE("GPL");