+++ /dev/null
-/*
- * 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 environment 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.
- */
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <asm/uaccess.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/vmalloc.h>
-#include <linux/elf.h>
-#include <linux/seq_file.h>
-#include <linux/syscalls.h>
-#include <linux/moduleloader.h>
-#include <linux/interrupt.h>
-#include <linux/poll.h>
-#include <linux/bootmem.h>
-#include <asm/mipsregs.h>
-#include <asm/mipsmtregs.h>
-#include <asm/cacheflush.h>
-#include <linux/atomic.h>
-#include <asm/cpu.h>
-#include <asm/mips_mt.h>
-#include <asm/processor.h>
-#include <asm/vpe.h>
-
-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))
-
-/*
- * The number of TCs and VPEs physically available on the core
- */
-static int hw_tcs, hw_vpes;
-static char module_name[] = "vpe";
-static int major;
-static const int minor = 1; /* fixed for now */
-
-/* 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
-
-extern unsigned long physical_memsize;
-
-#define MAX_VPES 16
-#define VPE_PATH_MAX 256
-
-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 int uid, gid;
- char cwd[VPE_PATH_MAX];
-
- 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;
-
- /* the list of who wants to know when something major happens */
- struct list_head notify;
-
- unsigned int ntcs;
-};
-
-struct tc {
- enum tc_state state;
- int index;
-
- struct vpe *pvpe; /* parent VPE */
- struct list_head tc; /* The list of TC's with this VPE */
- struct list_head list; /* The global list of tc's */
-};
-
-struct {
- spinlock_t vpe_list_lock;
- struct list_head vpe_list; /* Virtual processing elements */
- spinlock_t tc_list_lock;
- struct list_head tc_list; /* Thread contexts */
-} vpecontrol = {
- .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock),
- .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
- .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock),
- .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
-};
-
-static void release_progmem(void *ptr);
-
-/* get the vpe associated with this minor */
-static struct vpe *get_vpe(int minor)
-{
- struct vpe *res, *v;
-
- if (!cpu_has_mipsmt)
- return NULL;
-
- res = NULL;
- spin_lock(&vpecontrol.vpe_list_lock);
- list_for_each_entry(v, &vpecontrol.vpe_list, list) {
- if (v->minor == minor) {
- res = v;
- break;
- }
- }
- spin_unlock(&vpecontrol.vpe_list_lock);
-
- return res;
-}
-
-/* get the vpe associated with this minor */
-static struct tc *get_tc(int index)
-{
- struct tc *res, *t;
-
- res = NULL;
- spin_lock(&vpecontrol.tc_list_lock);
- list_for_each_entry(t, &vpecontrol.tc_list, list) {
- if (t->index == index) {
- res = t;
- break;
- }
- }
- spin_unlock(&vpecontrol.tc_list_lock);
-
- return res;
-}
-
-/* allocate a vpe and associate it with this minor (or index) */
-static struct vpe *alloc_vpe(int minor)
-{
- struct vpe *v;
-
- if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL)
- return NULL;
-
- INIT_LIST_HEAD(&v->tc);
- spin_lock(&vpecontrol.vpe_list_lock);
- list_add_tail(&v->list, &vpecontrol.vpe_list);
- spin_unlock(&vpecontrol.vpe_list_lock);
-
- INIT_LIST_HEAD(&v->notify);
- v->minor = minor;
-
- return v;
-}
-
-/* allocate a tc. At startup only tc0 is running, all other can be halted. */
-static struct tc *alloc_tc(int index)
-{
- struct tc *tc;
-
- if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
- goto out;
-
- INIT_LIST_HEAD(&tc->tc);
- tc->index = index;
-
- spin_lock(&vpecontrol.tc_list_lock);
- list_add_tail(&tc->list, &vpecontrol.tc_list);
- spin_unlock(&vpecontrol.tc_list_lock);
-
-out:
- return tc;
-}
-
-/* clean up and free everything */
-static void release_vpe(struct vpe *v)
-{
- list_del(&v->list);
- if (v->load_addr)
- release_progmem(v);
- kfree(v);
-}
-
-static void __maybe_unused 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_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_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);
-}
-
-/* Find some VPE program space */
-static void *alloc_progmem(unsigned long len)
-{
- void *addr;
-
-#ifdef CONFIG_MIPS_VPE_LOADER_TOM
- /*
- * This means you must tell Linux to use less memory than you
- * physically have, for example by passing a mem= boot argument.
- */
- addr = pfn_to_kaddr(max_low_pfn);
- memset(addr, 0, len);
-#else
- /* simple grab some mem for now */
- addr = kzalloc(len, GFP_KERNEL);
-#endif
-
- return addr;
-}
-
-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((unsigned long *)&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_DEBUG "VPE loader: apply_r_mips_gprel16: "
- "relative address 0x%x out of range of gp register\n",
- 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_DEBUG "VPE loader: "
- "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_DEBUG "VPE loader: apply_r_mips_26 "
- " unaligned relocation\n");
- 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;
- struct mips_hi16 *l, *next;
-
- /* Sign extend the addend we extract from the lo insn. */
- vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
-
- if (mips_hi16_list != NULL) {
-
- l = mips_hi16_list;
- while (l != NULL) {
- unsigned long insn;
-
- /*
- * The value for the HI16 had best be the same.
- */
- if (v != l->value) {
- printk(KERN_DEBUG "VPE loader: "
- "apply_r_mips_lo16/hi16: \t"
- "inconsistent value information\n");
- goto out_free;
- }
-
- /*
- * 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_free:
- while (l != NULL) {
- next = l->next;
- kfree(l);
- l = next;
- }
- mips_hi16_list = NULL;
-
- 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
-};
-
-static char *rstrs[] = {
- [R_MIPS_NONE] = "MIPS_NONE",
- [R_MIPS_32] = "MIPS_32",
- [R_MIPS_26] = "MIPS_26",
- [R_MIPS_HI16] = "MIPS_HI16",
- [R_MIPS_LO16] = "MIPS_LO16",
- [R_MIPS_GPREL16] = "MIPS_GPREL16",
- [R_MIPS_PC16] = "MIPS_PC16"
-};
-
-static 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 ) {
- char *r = rstrs[ELF32_R_TYPE(r_info)];
- printk(KERN_WARNING "VPE loader: .text+0x%x "
- "relocation type %s for symbol \"%s\" failed\n",
- rel[i].r_offset, r ? r : "UNKNOWN",
- strtab + sym->st_name);
- return res;
- }
- }
-
- return 0;
-}
-
-static inline 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 void 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 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;
- break;
- }
- }
-
- 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;
- }
- }
-}
-
-#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
-
-/* We are prepared so configure and start the VPE... */
-static int vpe_run(struct vpe * v)
-{
- unsigned long flags, val, dmt_flag;
- struct vpe_notifications *n;
- unsigned int vpeflags;
- struct tc *t;
-
- /* check we are the Master VPE */
- local_irq_save(flags);
- val = read_c0_vpeconf0();
- if (!(val & VPECONF0_MVP)) {
- printk(KERN_WARNING
- "VPE loader: only Master VPE's are allowed to configure MT\n");
- local_irq_restore(flags);
-
- return -1;
- }
-
- dmt_flag = dmt();
- vpeflags = dvpe();
-
- if (!list_empty(&v->tc)) {
- if ((t = list_entry(v->tc.next, struct tc, tc)) == NULL) {
- evpe(vpeflags);
- emt(dmt_flag);
- local_irq_restore(flags);
-
- printk(KERN_WARNING
- "VPE loader: TC %d is already in use.\n",
- t->index);
- return -ENOEXEC;
- }
- } else {
- evpe(vpeflags);
- emt(dmt_flag);
- local_irq_restore(flags);
-
- printk(KERN_WARNING
- "VPE loader: No TC's associated with VPE %d\n",
- v->minor);
-
- return -ENOEXEC;
- }
-
- /* Put MVPE's into 'configuration state' */
- set_c0_mvpcontrol(MVPCONTROL_VPC);
-
- settc(t->index);
-
- /* should check it is halted, and not activated */
- if ((read_tc_c0_tcstatus() & TCSTATUS_A) || !(read_tc_c0_tchalt() & TCHALT_H)) {
- evpe(vpeflags);
- emt(dmt_flag);
- local_irq_restore(flags);
-
- printk(KERN_WARNING "VPE loader: TC %d is already active!\n",
- t->index);
-
- 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_tc_c0_tccontext((unsigned long)0);
-
- /*
- * 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);
-
- /*
- * The sde-kit passes 'memsize' to __start in $a3, so set something
- * here... Or set $a3 to zero and define DFLT_STACK_SIZE and
- * DFLT_HEAP_SIZE when you compile your program
- */
- mttgpr(6, v->ntcs);
- mttgpr(7, physical_memsize);
-
- /* set up VPE1 */
- /*
- * bind the TC to VPE 1 as late as possible so we only have the final
- * VPE registers to set up, and so an EJTAG probe can trigger on it
- */
- write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
-
- write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~(VPECONF0_VPA));
-
- back_to_back_c0_hazard();
-
- /* Set up the XTC bit in vpeconf0 to point at our tc */
- write_vpe_c0_vpeconf0( (read_vpe_c0_vpeconf0() & ~(VPECONF0_XTC))
- | (t->index << VPECONF0_XTC_SHIFT));
-
- back_to_back_c0_hazard();
-
- /* enable this VPE */
- write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
-
- /* clear out any left overs from a previous program */
- write_vpe_c0_status(0);
- write_vpe_c0_cause(0);
-
- /* take system out of configuration state */
- clear_c0_mvpcontrol(MVPCONTROL_VPC);
-
- /*
- * SMTC/SMVP kernels manage VPE enable independently,
- * but uniprocessor kernels need to turn it on, even
- * if that wasn't the pre-dvpe() state.
- */
-#ifdef CONFIG_SMP
- evpe(vpeflags);
-#else
- evpe(EVPE_ENABLE);
-#endif
- emt(dmt_flag);
- local_irq_restore(flags);
-
- list_for_each_entry(n, &v->notify, list)
- n->start(minor);
-
- return 0;
-}
-
-static int 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;
- }
- }
-
- if ( (v->__start == 0) || (v->shared_ptr == NULL))
- return -1;
-
- 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.
- */
-static 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, relocate = 0;
- struct module mod; // so we can re-use the relocations code
-
- memset(&mod, 0, sizeof(struct module));
- strcpy(mod.name, "VPE loader");
-
- 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, SELFMAG) != 0
- || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC)
- || !elf_check_arch(hdr)
- || hdr->e_shentsize != sizeof(*sechdrs)) {
- printk(KERN_WARNING
- "VPE loader: program wrong arch or weird elf version\n");
-
- return -ENOEXEC;
- }
-
- if (hdr->e_type == ET_REL)
- relocate = 1;
-
- if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
- printk(KERN_ERR "VPE loader: 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;
-
- if (relocate) {
- 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);
- if (!v->load_addr)
- return -ENOMEM;
-
- pr_info("VPE loader: loading to %p\n", v->load_addr);
-
- if (relocate) {
- 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;
-
- printk(KERN_DEBUG " section sh_name %s sh_addr 0x%x\n",
- secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr);
- }
-
- /* Fix up syms, so that st_value is a pointer to location. */
- simplify_symbols(sechdrs, symindex, strtab, secstrings,
- hdr->e_shnum, &mod);
-
- /* 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)
- return err;
-
- }
- } else {
- struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
-
- for (i = 0; i < hdr->e_phnum; i++) {
- if (phdr->p_type == PT_LOAD) {
- memcpy((void *)phdr->p_paddr,
- (char *)hdr + phdr->p_offset,
- phdr->p_filesz);
- memset((void *)phdr->p_paddr + phdr->p_filesz,
- 0, phdr->p_memsz - phdr->p_filesz);
- }
- phdr++;
- }
-
- for (i = 0; i < hdr->e_shnum; i++) {
- /* 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;
-
- /* mark the symtab's address for when we try to find the
- magic symbols */
- sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
- }
- }
- }
-
- /* 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) {
- if (v->__start == 0) {
- printk(KERN_WARNING "VPE loader: program does not contain "
- "a __start symbol\n");
- return -ENOEXEC;
- }
-
- if (v->shared_ptr == NULL)
- printk(KERN_WARNING "VPE loader: "
- "program does not contain vpe_shared symbol.\n"
- " Unable to use AMVP (AP/SP) facilities.\n");
- }
-
- printk(" elf loaded\n");
- return 0;
-}
-
-static void cleanup_tc(struct tc *tc)
-{
- unsigned long flags;
- unsigned int mtflags, vpflags;
- int tmp;
-
- local_irq_save(flags);
- mtflags = dmt();
- vpflags = dvpe();
- /* Put MVPE's into 'configuration state' */
- set_c0_mvpcontrol(MVPCONTROL_VPC);
-
- settc(tc->index);
- 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);
- mips_ihb();
-
- /* bind it to anything other than VPE1 */
-// write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
-
- clear_c0_mvpcontrol(MVPCONTROL_VPC);
- evpe(vpflags);
- emt(mtflags);
- local_irq_restore(flags);
-}
-
-static int getcwd(char *buff, int size)
-{
- mm_segment_t old_fs;
- int ret;
-
- old_fs = get_fs();
- set_fs(KERNEL_DS);
-
- ret = sys_getcwd(buff, size);
-
- set_fs(old_fs);
-
- return ret;
-}
-
-/* checks VPE is unused and gets ready to load program */
-static int vpe_open(struct inode *inode, struct file *filp)
-{
- enum vpe_state state;
- struct vpe_notifications *not;
- struct vpe *v;
- int ret;
-
- if (minor != iminor(inode)) {
- /* assume only 1 device at the moment. */
- pr_warning("VPE loader: only vpe1 is supported\n");
-
- return -ENODEV;
- }
-
- if ((v = get_vpe(tclimit)) == NULL) {
- pr_warning("VPE loader: unable to get vpe\n");
-
- return -ENODEV;
- }
-
- state = xchg(&v->state, VPE_STATE_INUSE);
- if (state != VPE_STATE_UNUSED) {
- printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
-
- list_for_each_entry(not, &v->notify, list) {
- not->stop(tclimit);
- }
-
- release_progmem(v->load_addr);
- cleanup_tc(get_tc(tclimit));
- }
-
- /* this of-course trashes what was there before... */
- v->pbuffer = vmalloc(P_SIZE);
- if (!v->pbuffer) {
- pr_warning("VPE loader: unable to allocate memory\n");
- return -ENOMEM;
- }
- v->plen = P_SIZE;
- v->load_addr = NULL;
- v->len = 0;
-
- v->uid = filp->f_cred->fsuid;
- v->gid = filp->f_cred->fsgid;
-
- v->cwd[0] = 0;
- ret = getcwd(v->cwd, VPE_PATH_MAX);
- if (ret < 0)
- printk(KERN_WARNING "VPE loader: open, getcwd returned %d\n", ret);
-
- v->shared_ptr = NULL;
- v->__start = 0;
-
- return 0;
-}
-
-static int vpe_release(struct inode *inode, struct file *filp)
-{
- struct vpe *v;
- Elf_Ehdr *hdr;
- int ret = 0;
-
- v = get_vpe(tclimit);
- if (v == NULL)
- return -ENODEV;
-
- hdr = (Elf_Ehdr *) v->pbuffer;
- if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) {
- if (vpe_elfload(v) >= 0) {
- vpe_run(v);
- } else {
- printk(KERN_WARNING "VPE loader: ELF load failed.\n");
- ret = -ENOEXEC;
- }
- } else {
- printk(KERN_WARNING "VPE loader: only elf files are supported\n");
- ret = -ENOEXEC;
- }
-
- /* It's good to be able to run the SP and if it chokes have a look at
- the /dev/rt?. But if we reset the pointer to the shared struct we
- lose what has happened. So perhaps if garbage is sent to the vpe
- device, use it as a trigger for the reset. Hopefully a nice
- executable will be along shortly. */
- if (ret < 0)
- v->shared_ptr = NULL;
-
- 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)
-{
- size_t ret = count;
- struct vpe *v;
-
- if (iminor(file->f_path.dentry->d_inode) != minor)
- return -ENODEV;
-
- v = get_vpe(tclimit);
- if (v == NULL)
- return -ENODEV;
-
- 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)
- return -EFAULT;
-
- v->len += count;
- return ret;
-}
-
-static const struct file_operations vpe_fops = {
- .owner = THIS_MODULE,
- .open = vpe_open,
- .release = vpe_release,
- .write = vpe_write,
- .llseek = noop_llseek,
-};
-
-/* 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);
-
- /* halt the TC */
- write_tc_c0_tchalt(TCHALT_H);
- mips_ihb();
-
- /* mark the TC unallocated */
- write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
-
- 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)
- return NULL;
-
- return v->shared_ptr;
-}
-
-EXPORT_SYMBOL(vpe_get_shared);
-
-int vpe_getuid(int index)
-{
- struct vpe *v;
-
- if ((v = get_vpe(index)) == NULL)
- return -1;
-
- return v->uid;
-}
-
-EXPORT_SYMBOL(vpe_getuid);
-
-int vpe_getgid(int index)
-{
- struct vpe *v;
-
- if ((v = get_vpe(index)) == NULL)
- return -1;
-
- return v->gid;
-}
-
-EXPORT_SYMBOL(vpe_getgid);
-
-int vpe_notify(int index, struct vpe_notifications *notify)
-{
- struct vpe *v;
-
- if ((v = get_vpe(index)) == NULL)
- return -1;
-
- list_add(¬ify->list, &v->notify);
- return 0;
-}
-
-EXPORT_SYMBOL(vpe_notify);
-
-char *vpe_getcwd(int index)
-{
- struct vpe *v;
-
- if ((v = get_vpe(index)) == NULL)
- return NULL;
-
- return v->cwd;
-}
-
-EXPORT_SYMBOL(vpe_getcwd);
-
-static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len)
-{
- struct vpe *vpe = get_vpe(tclimit);
- struct vpe_notifications *not;
-
- list_for_each_entry(not, &vpe->notify, list) {
- not->stop(tclimit);
- }
-
- release_progmem(vpe->load_addr);
- cleanup_tc(get_tc(tclimit));
- vpe_stop(vpe);
- vpe_free(vpe);
-
- return len;
-}
-
-static ssize_t show_ntcs(struct device *cd, struct device_attribute *attr,
- char *buf)
-{
- struct vpe *vpe = get_vpe(tclimit);
-
- return sprintf(buf, "%d\n", vpe->ntcs);
-}
-
-static ssize_t store_ntcs(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len)
-{
- struct vpe *vpe = get_vpe(tclimit);
- unsigned long new;
- char *endp;
-
- new = simple_strtoul(buf, &endp, 0);
- if (endp == buf)
- goto out_einval;
-
- if (new == 0 || new > (hw_tcs - tclimit))
- goto out_einval;
-
- vpe->ntcs = new;
-
- return len;
-
-out_einval:
- return -EINVAL;
-}
-
-static struct device_attribute vpe_class_attributes[] = {
- __ATTR(kill, S_IWUSR, NULL, store_kill),
- __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
- {}
-};
-
-static void vpe_device_release(struct device *cd)
-{
- kfree(cd);
-}
-
-struct class vpe_class = {
- .name = "vpe",
- .owner = THIS_MODULE,
- .dev_release = vpe_device_release,
- .dev_attrs = vpe_class_attributes,
-};
-
-struct device vpe_device;
-
-static int __init vpe_module_init(void)
-{
- unsigned int mtflags, vpflags;
- unsigned long flags, val;
- struct vpe *v = NULL;
- struct tc *t;
- int tc, err;
-
- if (!cpu_has_mipsmt) {
- printk("VPE loader: not a MIPS MT capable processor\n");
- return -ENODEV;
- }
-
- if (vpelimit == 0) {
- printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
- "initializing VPE loader.\nPass maxvpes=<n> argument as "
- "kernel argument\n");
-
- return -ENODEV;
- }
-
- if (tclimit == 0) {
- printk(KERN_WARNING "No TCs reserved for AP/SP, not "
- "initializing VPE loader.\nPass maxtcs=<n> argument as "
- "kernel argument\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;
- }
-
- err = class_register(&vpe_class);
- if (err) {
- printk(KERN_ERR "vpe_class registration failed\n");
- goto out_chrdev;
- }
-
- device_initialize(&vpe_device);
- vpe_device.class = &vpe_class,
- vpe_device.parent = NULL,
- dev_set_name(&vpe_device, "vpe1");
- vpe_device.devt = MKDEV(major, minor);
- err = device_add(&vpe_device);
- if (err) {
- printk(KERN_ERR "Adding vpe_device failed\n");
- goto out_class;
- }
-
- local_irq_save(flags);
- mtflags = dmt();
- vpflags = dvpe();
-
- /* Put MVPE's into 'configuration state' */
- set_c0_mvpcontrol(MVPCONTROL_VPC);
-
- /* dump_mtregs(); */
-
- val = read_c0_mvpconf0();
- hw_tcs = (val & MVPCONF0_PTC) + 1;
- hw_vpes = ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
-
- for (tc = tclimit; tc < hw_tcs; tc++) {
- /*
- * Must re-enable multithreading temporarily or in case we
- * reschedule send IPIs or similar we might hang.
- */
- clear_c0_mvpcontrol(MVPCONTROL_VPC);
- evpe(vpflags);
- emt(mtflags);
- local_irq_restore(flags);
- t = alloc_tc(tc);
- if (!t) {
- err = -ENOMEM;
- goto out;
- }
-
- local_irq_save(flags);
- mtflags = dmt();
- vpflags = dvpe();
- set_c0_mvpcontrol(MVPCONTROL_VPC);
-
- /* VPE's */
- if (tc < hw_tcs) {
- settc(tc);
-
- if ((v = alloc_vpe(tc)) == NULL) {
- printk(KERN_WARNING "VPE: unable to allocate VPE\n");
-
- goto out_reenable;
- }
-
- v->ntcs = hw_tcs - tclimit;
-
- /* add the tc to the list of this vpe's tc's. */
- list_add(&t->tc, &v->tc);
-
- /* deactivate all but vpe0 */
- if (tc >= tclimit) {
- 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 (tc >= vpelimit) {
- /*
- * 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 (tc >= tclimit) {
- unsigned long tmp;
-
- settc(tc);
-
- /* Any TC that is bound to VPE0 gets left as is - in case
- we are running SMTC on VPE0. A TC that is bound to any
- other VPE gets bound to VPE0, ideally I'd like to make
- it homeless but it doesn't appear to let me bind a TC
- to a non-existent VPE. Which is perfectly reasonable.
-
- The (un)bound state is visible to an EJTAG probe so may
- notify GDB...
- */
-
- if (((tmp = read_tc_c0_tcbind()) & TCBIND_CURVPE)) {
- /* tc is bound >vpe0 */
- write_tc_c0_tcbind(tmp & ~TCBIND_CURVPE);
-
- t->pvpe = get_vpe(0); /* set the parent vpe */
- }
-
- /* halt the TC */
- write_tc_c0_tchalt(TCHALT_H);
- mips_ihb();
-
- tmp = read_tc_c0_tcstatus();
-
- /* mark not activated and not dynamically allocatable */
- tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
- tmp |= TCSTATUS_IXMT; /* interrupt exempt */
- write_tc_c0_tcstatus(tmp);
- }
- }
-
-out_reenable:
- /* release config state */
- clear_c0_mvpcontrol(MVPCONTROL_VPC);
-
- evpe(vpflags);
- emt(mtflags);
- local_irq_restore(flags);
-
- return 0;
-
-out_class:
- class_unregister(&vpe_class);
-out_chrdev:
- unregister_chrdev(major, module_name);
-
-out:
- return err;
-}
-
-static void __exit vpe_module_exit(void)
-{
- struct vpe *v, *n;
-
- device_del(&vpe_device);
- unregister_chrdev(major, module_name);
-
- /* No locking needed here */
- list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
- if (v->state != VPE_STATE_UNUSED)
- release_vpe(v);
- }
-}
-
-module_init(vpe_module_init);
-module_exit(vpe_module_exit);
-MODULE_DESCRIPTION("MIPS VPE Loader");
-MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
-MODULE_LICENSE("GPL");
projects / karo-tx-linux.git / commitdiff