0f5d0df35e
The old method of attempting to load a invalid program was just too icky. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1608 lines
36 KiB
C
1608 lines
36 KiB
C
/*
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* Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*/
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/*
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* VPE support module
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*
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* Provides support for loading a MIPS SP program on VPE1.
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* The SP enviroment is rather simple, no tlb's. It needs to be relocatable
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* (or partially linked). You should initialise your stack in the startup
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* code. This loader looks for the symbol __start and sets up
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* execution to resume from there. The MIPS SDE kit contains suitable examples.
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*
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* To load and run, simply cat a SP 'program file' to /dev/vpe1.
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* i.e cat spapp >/dev/vpe1.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/vmalloc.h>
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#include <linux/elf.h>
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#include <linux/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/moduleloader.h>
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#include <linux/interrupt.h>
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#include <linux/poll.h>
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#include <linux/bootmem.h>
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#include <asm/mipsregs.h>
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#include <asm/mipsmtregs.h>
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#include <asm/cacheflush.h>
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#include <asm/atomic.h>
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#include <asm/cpu.h>
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#include <asm/mips_mt.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/vpe.h>
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#include <asm/kspd.h>
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#include <asm/mips_mt.h>
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typedef void *vpe_handle;
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#ifndef ARCH_SHF_SMALL
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#define ARCH_SHF_SMALL 0
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#endif
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/* If this is set, the section belongs in the init part of the module */
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#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
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/*
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* The number of TCs and VPEs physically available on the core
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*/
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static int hw_tcs, hw_vpes;
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static char module_name[] = "vpe";
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static int major;
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static const int minor = 1; /* fixed for now */
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#ifdef CONFIG_MIPS_APSP_KSPD
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static struct kspd_notifications kspd_events;
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static int kspd_events_reqd = 0;
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#endif
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/* grab the likely amount of memory we will need. */
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#ifdef CONFIG_MIPS_VPE_LOADER_TOM
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#define P_SIZE (2 * 1024 * 1024)
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#else
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/* add an overhead to the max kmalloc size for non-striped symbols/etc */
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#define P_SIZE (256 * 1024)
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#endif
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extern unsigned long physical_memsize;
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#define MAX_VPES 16
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#define VPE_PATH_MAX 256
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enum vpe_state {
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VPE_STATE_UNUSED = 0,
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VPE_STATE_INUSE,
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VPE_STATE_RUNNING
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};
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enum tc_state {
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TC_STATE_UNUSED = 0,
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TC_STATE_INUSE,
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TC_STATE_RUNNING,
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TC_STATE_DYNAMIC
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};
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struct vpe {
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enum vpe_state state;
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/* (device) minor associated with this vpe */
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int minor;
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/* elfloader stuff */
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void *load_addr;
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unsigned long len;
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char *pbuffer;
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unsigned long plen;
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unsigned int uid, gid;
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char cwd[VPE_PATH_MAX];
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unsigned long __start;
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/* tc's associated with this vpe */
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struct list_head tc;
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/* The list of vpe's */
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struct list_head list;
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/* shared symbol address */
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void *shared_ptr;
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/* the list of who wants to know when something major happens */
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struct list_head notify;
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unsigned int ntcs;
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};
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struct tc {
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enum tc_state state;
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int index;
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struct vpe *pvpe; /* parent VPE */
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struct list_head tc; /* The list of TC's with this VPE */
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struct list_head list; /* The global list of tc's */
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};
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struct {
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/* Virtual processing elements */
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struct list_head vpe_list;
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/* Thread contexts */
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struct list_head tc_list;
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} vpecontrol = {
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.vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list),
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.tc_list = LIST_HEAD_INIT(vpecontrol.tc_list)
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};
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static void release_progmem(void *ptr);
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extern void save_gp_address(unsigned int secbase, unsigned int rel);
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/* get the vpe associated with this minor */
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struct vpe *get_vpe(int minor)
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{
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struct vpe *v;
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if (!cpu_has_mipsmt)
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return NULL;
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list_for_each_entry(v, &vpecontrol.vpe_list, list) {
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if (v->minor == minor)
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return v;
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}
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return NULL;
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}
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/* get the vpe associated with this minor */
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struct tc *get_tc(int index)
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{
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struct tc *t;
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list_for_each_entry(t, &vpecontrol.tc_list, list) {
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if (t->index == index)
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return t;
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}
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return NULL;
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}
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struct tc *get_tc_unused(void)
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{
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struct tc *t;
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list_for_each_entry(t, &vpecontrol.tc_list, list) {
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if (t->state == TC_STATE_UNUSED)
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return t;
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}
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return NULL;
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}
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/* allocate a vpe and associate it with this minor (or index) */
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struct vpe *alloc_vpe(int minor)
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{
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struct vpe *v;
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if ((v = kzalloc(sizeof(struct vpe), GFP_KERNEL)) == NULL) {
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return NULL;
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}
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INIT_LIST_HEAD(&v->tc);
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list_add_tail(&v->list, &vpecontrol.vpe_list);
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INIT_LIST_HEAD(&v->notify);
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v->minor = minor;
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return v;
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}
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/* allocate a tc. At startup only tc0 is running, all other can be halted. */
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struct tc *alloc_tc(int index)
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{
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struct tc *tc;
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if ((tc = kzalloc(sizeof(struct tc), GFP_KERNEL)) == NULL)
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goto out;
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INIT_LIST_HEAD(&tc->tc);
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tc->index = index;
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list_add_tail(&tc->list, &vpecontrol.tc_list);
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out:
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return tc;
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}
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/* clean up and free everything */
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void release_vpe(struct vpe *v)
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{
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list_del(&v->list);
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if (v->load_addr)
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release_progmem(v);
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kfree(v);
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}
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void dump_mtregs(void)
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{
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unsigned long val;
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val = read_c0_config3();
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printk("config3 0x%lx MT %ld\n", val,
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(val & CONFIG3_MT) >> CONFIG3_MT_SHIFT);
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val = read_c0_mvpcontrol();
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printk("MVPControl 0x%lx, STLB %ld VPC %ld EVP %ld\n", val,
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(val & MVPCONTROL_STLB) >> MVPCONTROL_STLB_SHIFT,
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(val & MVPCONTROL_VPC) >> MVPCONTROL_VPC_SHIFT,
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(val & MVPCONTROL_EVP));
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val = read_c0_mvpconf0();
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printk("mvpconf0 0x%lx, PVPE %ld PTC %ld M %ld\n", val,
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(val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT,
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val & MVPCONF0_PTC, (val & MVPCONF0_M) >> MVPCONF0_M_SHIFT);
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}
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/* Find some VPE program space */
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static void *alloc_progmem(unsigned long len)
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{
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#ifdef CONFIG_MIPS_VPE_LOADER_TOM
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/* this means you must tell linux to use less memory than you physically have */
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return pfn_to_kaddr(max_pfn);
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#else
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// simple grab some mem for now
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return kmalloc(len, GFP_KERNEL);
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#endif
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}
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static void release_progmem(void *ptr)
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{
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#ifndef CONFIG_MIPS_VPE_LOADER_TOM
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kfree(ptr);
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#endif
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}
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/* Update size with this section: return offset. */
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static long get_offset(unsigned long *size, Elf_Shdr * sechdr)
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{
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long ret;
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ret = ALIGN(*size, sechdr->sh_addralign ? : 1);
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*size = ret + sechdr->sh_size;
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return ret;
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}
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/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
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might -- code, read-only data, read-write data, small data. Tally
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sizes, and place the offsets into sh_entsize fields: high bit means it
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belongs in init. */
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static void layout_sections(struct module *mod, const Elf_Ehdr * hdr,
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Elf_Shdr * sechdrs, const char *secstrings)
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{
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static unsigned long const masks[][2] = {
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/* NOTE: all executable code must be the first section
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* in this array; otherwise modify the text_size
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* finder in the two loops below */
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{SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL},
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{SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL},
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{SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL},
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{ARCH_SHF_SMALL | SHF_ALLOC, 0}
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};
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unsigned int m, i;
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for (i = 0; i < hdr->e_shnum; i++)
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sechdrs[i].sh_entsize = ~0UL;
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for (m = 0; m < ARRAY_SIZE(masks); ++m) {
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for (i = 0; i < hdr->e_shnum; ++i) {
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Elf_Shdr *s = &sechdrs[i];
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// || strncmp(secstrings + s->sh_name, ".init", 5) == 0)
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if ((s->sh_flags & masks[m][0]) != masks[m][0]
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|| (s->sh_flags & masks[m][1])
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|| s->sh_entsize != ~0UL)
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continue;
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s->sh_entsize = get_offset(&mod->core_size, s);
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}
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if (m == 0)
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mod->core_text_size = mod->core_size;
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}
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}
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/* from module-elf32.c, but subverted a little */
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struct mips_hi16 {
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struct mips_hi16 *next;
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Elf32_Addr *addr;
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Elf32_Addr value;
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};
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static struct mips_hi16 *mips_hi16_list;
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static unsigned int gp_offs, gp_addr;
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static int apply_r_mips_none(struct module *me, uint32_t *location,
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Elf32_Addr v)
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{
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return 0;
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}
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static int apply_r_mips_gprel16(struct module *me, uint32_t *location,
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Elf32_Addr v)
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{
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int rel;
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if( !(*location & 0xffff) ) {
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rel = (int)v - gp_addr;
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}
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else {
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/* .sbss + gp(relative) + offset */
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/* kludge! */
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rel = (int)(short)((int)v + gp_offs +
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(int)(short)(*location & 0xffff) - gp_addr);
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}
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if( (rel > 32768) || (rel < -32768) ) {
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printk(KERN_DEBUG "VPE loader: apply_r_mips_gprel16: "
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"relative address 0x%x out of range of gp register\n",
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rel);
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return -ENOEXEC;
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}
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*location = (*location & 0xffff0000) | (rel & 0xffff);
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return 0;
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}
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static int apply_r_mips_pc16(struct module *me, uint32_t *location,
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Elf32_Addr v)
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{
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int rel;
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rel = (((unsigned int)v - (unsigned int)location));
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rel >>= 2; // because the offset is in _instructions_ not bytes.
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rel -= 1; // and one instruction less due to the branch delay slot.
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if( (rel > 32768) || (rel < -32768) ) {
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printk(KERN_DEBUG "VPE loader: "
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"apply_r_mips_pc16: relative address out of range 0x%x\n", rel);
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return -ENOEXEC;
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}
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*location = (*location & 0xffff0000) | (rel & 0xffff);
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return 0;
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}
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static int apply_r_mips_32(struct module *me, uint32_t *location,
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Elf32_Addr v)
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{
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*location += v;
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return 0;
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}
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static int apply_r_mips_26(struct module *me, uint32_t *location,
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Elf32_Addr v)
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{
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if (v % 4) {
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printk(KERN_DEBUG "VPE loader: apply_r_mips_26 "
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" unaligned relocation\n");
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return -ENOEXEC;
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}
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/*
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* Not desperately convinced this is a good check of an overflow condition
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* anyway. But it gets in the way of handling undefined weak symbols which
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* we want to set to zero.
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* if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
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* printk(KERN_ERR
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* "module %s: relocation overflow\n",
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* me->name);
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* return -ENOEXEC;
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* }
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*/
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*location = (*location & ~0x03ffffff) |
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((*location + (v >> 2)) & 0x03ffffff);
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return 0;
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}
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static int apply_r_mips_hi16(struct module *me, uint32_t *location,
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Elf32_Addr v)
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{
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struct mips_hi16 *n;
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/*
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* We cannot relocate this one now because we don't know the value of
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* the carry we need to add. Save the information, and let LO16 do the
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* actual relocation.
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*/
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n = kmalloc(sizeof *n, GFP_KERNEL);
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if (!n)
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return -ENOMEM;
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n->addr = location;
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n->value = v;
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n->next = mips_hi16_list;
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mips_hi16_list = n;
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return 0;
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}
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static int apply_r_mips_lo16(struct module *me, uint32_t *location,
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Elf32_Addr v)
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{
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unsigned long insnlo = *location;
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Elf32_Addr val, vallo;
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/* Sign extend the addend we extract from the lo insn. */
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vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
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if (mips_hi16_list != NULL) {
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struct mips_hi16 *l;
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l = mips_hi16_list;
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while (l != NULL) {
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struct mips_hi16 *next;
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unsigned long insn;
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/*
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* The value for the HI16 had best be the same.
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*/
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if (v != l->value) {
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printk(KERN_DEBUG "VPE loader: "
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"apply_r_mips_lo16/hi16: "
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"inconsistent value information\n");
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return -ENOEXEC;
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}
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/*
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* Do the HI16 relocation. Note that we actually don't
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* need to know anything about the LO16 itself, except
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* where to find the low 16 bits of the addend needed
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* by the LO16.
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*/
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insn = *l->addr;
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val = ((insn & 0xffff) << 16) + vallo;
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val += v;
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/*
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* Account for the sign extension that will happen in
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* the low bits.
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*/
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val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
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insn = (insn & ~0xffff) | val;
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*l->addr = insn;
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next = l->next;
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kfree(l);
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l = next;
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}
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mips_hi16_list = NULL;
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}
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/*
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* Ok, we're done with the HI16 relocs. Now deal with the LO16.
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*/
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val = v + vallo;
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insnlo = (insnlo & ~0xffff) | (val & 0xffff);
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*location = insnlo;
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return 0;
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}
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static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
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Elf32_Addr v) = {
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[R_MIPS_NONE] = apply_r_mips_none,
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[R_MIPS_32] = apply_r_mips_32,
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[R_MIPS_26] = apply_r_mips_26,
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[R_MIPS_HI16] = apply_r_mips_hi16,
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[R_MIPS_LO16] = apply_r_mips_lo16,
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[R_MIPS_GPREL16] = apply_r_mips_gprel16,
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[R_MIPS_PC16] = apply_r_mips_pc16
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};
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|
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static char *rstrs[] = {
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[R_MIPS_NONE] = "MIPS_NONE",
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[R_MIPS_32] = "MIPS_32",
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[R_MIPS_26] = "MIPS_26",
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[R_MIPS_HI16] = "MIPS_HI16",
|
|
[R_MIPS_LO16] = "MIPS_LO16",
|
|
[R_MIPS_GPREL16] = "MIPS_GPREL16",
|
|
[R_MIPS_PC16] = "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 ) {
|
|
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;
|
|
}
|
|
|
|
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);
|
|
|
|
#ifdef CONFIG_SMP
|
|
evpe(EVPE_ENABLE);
|
|
#else
|
|
evpe(vpeflags);
|
|
#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, 4) != 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);
|
|
memset(v->load_addr, 0, mod.core_size);
|
|
|
|
printk("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 {
|
|
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;
|
|
}
|
|
|
|
/* filter sections we dont want in the final image */
|
|
if (!(sechdrs[i].sh_flags & SHF_ALLOC) ||
|
|
(sechdrs[i].sh_type == SHT_MIPS_REGINFO)) {
|
|
printk( KERN_DEBUG " ignoring section, "
|
|
"name %s type %x address 0x%x \n",
|
|
secstrings + sechdrs[i].sh_name,
|
|
sechdrs[i].sh_type, sechdrs[i].sh_addr);
|
|
continue;
|
|
}
|
|
|
|
if (sechdrs[i].sh_addr < (unsigned int)v->load_addr) {
|
|
printk( KERN_WARNING "VPE loader: "
|
|
"fully linked image has invalid section, "
|
|
"name %s type %x address 0x%x, before load "
|
|
"address of 0x%x\n",
|
|
secstrings + sechdrs[i].sh_name,
|
|
sechdrs[i].sh_type, sechdrs[i].sh_addr,
|
|
(unsigned int)v->load_addr);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
printk(KERN_DEBUG " copying section sh_name %s, sh_addr 0x%x "
|
|
"size 0x%x0 from x%p\n",
|
|
secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr,
|
|
sechdrs[i].sh_size, hdr + sechdrs[i].sh_offset);
|
|
|
|
if (sechdrs[i].sh_type != SHT_NOBITS)
|
|
memcpy((void *)sechdrs[i].sh_addr,
|
|
(char *)hdr + sechdrs[i].sh_offset,
|
|
sechdrs[i].sh_size);
|
|
else
|
|
memset((void *)sechdrs[i].sh_addr, 0, sechdrs[i].sh_size);
|
|
}
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/* 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. */
|
|
printk(KERN_WARNING "VPE loader: only vpe1 is supported\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if ((v = get_vpe(tclimit)) == NULL) {
|
|
printk(KERN_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);
|
|
v->plen = P_SIZE;
|
|
v->load_addr = NULL;
|
|
v->len = 0;
|
|
|
|
v->uid = filp->f_uid;
|
|
v->gid = filp->f_gid;
|
|
|
|
#ifdef CONFIG_MIPS_APSP_KSPD
|
|
/* get kspd to tell us when a syscall_exit happens */
|
|
if (!kspd_events_reqd) {
|
|
kspd_notify(&kspd_events);
|
|
kspd_events_reqd++;
|
|
}
|
|
#endif
|
|
|
|
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, 4) == 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
|
|
loose 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;
|
|
|
|
// 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)
|
|
{
|
|
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 (v->pbuffer == NULL) {
|
|
printk(KERN_ERR "VPE loader: no buffer for program\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)
|
|
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
|
|
};
|
|
|
|
/* 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)
|
|
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);
|
|
|
|
#ifdef CONFIG_MIPS_APSP_KSPD
|
|
static void kspd_sp_exit( int sp_id)
|
|
{
|
|
cleanup_tc(get_tc(sp_id));
|
|
}
|
|
#endif
|
|
|
|
static ssize_t store_kill(struct class_device *dev, 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 class_device *cd, char *buf)
|
|
{
|
|
struct vpe *vpe = get_vpe(tclimit);
|
|
|
|
return sprintf(buf, "%d\n", vpe->ntcs);
|
|
}
|
|
|
|
static ssize_t store_ntcs(struct class_device *dev, 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 class_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_class_device_release(struct class_device *cd)
|
|
{
|
|
kfree(cd);
|
|
}
|
|
|
|
struct class vpe_class = {
|
|
.name = "vpe",
|
|
.owner = THIS_MODULE,
|
|
.release = vpe_class_device_release,
|
|
.class_dev_attrs = vpe_class_attributes,
|
|
};
|
|
|
|
struct class_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;
|
|
}
|
|
|
|
class_device_initialize(&vpe_device);
|
|
vpe_device.class = &vpe_class,
|
|
vpe_device.parent = NULL,
|
|
strlcpy(vpe_device.class_id, "vpe1", BUS_ID_SIZE);
|
|
vpe_device.devt = MKDEV(major, minor);
|
|
err = class_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 */
|
|
}
|
|
|
|
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);
|
|
|
|
write_tc_c0_tchalt(TCHALT_H);
|
|
}
|
|
}
|
|
|
|
out_reenable:
|
|
/* release config state */
|
|
clear_c0_mvpcontrol(MVPCONTROL_VPC);
|
|
|
|
evpe(vpflags);
|
|
emt(mtflags);
|
|
local_irq_restore(flags);
|
|
|
|
#ifdef CONFIG_MIPS_APSP_KSPD
|
|
kspd_events.kspd_sp_exit = kspd_sp_exit;
|
|
#endif
|
|
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;
|
|
|
|
list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list) {
|
|
if (v->state != VPE_STATE_UNUSED) {
|
|
release_vpe(v);
|
|
}
|
|
}
|
|
|
|
class_device_del(&vpe_device);
|
|
unregister_chrdev(major, module_name);
|
|
}
|
|
|
|
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");
|