406 lines
9.0 KiB
C
406 lines
9.0 KiB
C
/*
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* Copyright (C) 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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/unistd.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/syscalls.h>
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#include <linux/workqueue.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <asm/vpe.h>
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#include <asm/rtlx.h>
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#include <asm/kspd.h>
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static struct workqueue_struct *workqueue = NULL;
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static struct work_struct work;
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extern unsigned long cpu_khz;
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struct mtsp_syscall {
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int cmd;
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unsigned char abi;
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unsigned char size;
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};
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struct mtsp_syscall_ret {
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int retval;
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int errno;
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};
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struct mtsp_syscall_generic {
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int arg0;
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int arg1;
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int arg2;
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int arg3;
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int arg4;
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int arg5;
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int arg6;
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};
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static struct list_head kspd_notifylist;
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static int sp_stopping = 0;
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/* these should match with those in the SDE kit */
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#define MTSP_SYSCALL_BASE 0
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#define MTSP_SYSCALL_EXIT (MTSP_SYSCALL_BASE + 0)
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#define MTSP_SYSCALL_OPEN (MTSP_SYSCALL_BASE + 1)
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#define MTSP_SYSCALL_READ (MTSP_SYSCALL_BASE + 2)
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#define MTSP_SYSCALL_WRITE (MTSP_SYSCALL_BASE + 3)
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#define MTSP_SYSCALL_CLOSE (MTSP_SYSCALL_BASE + 4)
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#define MTSP_SYSCALL_LSEEK32 (MTSP_SYSCALL_BASE + 5)
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#define MTSP_SYSCALL_ISATTY (MTSP_SYSCALL_BASE + 6)
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#define MTSP_SYSCALL_GETTIME (MTSP_SYSCALL_BASE + 7)
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#define MTSP_SYSCALL_PIPEFREQ (MTSP_SYSCALL_BASE + 8)
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#define MTSP_SYSCALL_GETTOD (MTSP_SYSCALL_BASE + 9)
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#define MTSP_SYSCALL_IOCTL (MTSP_SYSCALL_BASE + 10)
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#define MTSP_O_RDONLY 0x0000
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#define MTSP_O_WRONLY 0x0001
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#define MTSP_O_RDWR 0x0002
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#define MTSP_O_NONBLOCK 0x0004
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#define MTSP_O_APPEND 0x0008
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#define MTSP_O_SHLOCK 0x0010
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#define MTSP_O_EXLOCK 0x0020
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#define MTSP_O_ASYNC 0x0040
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#define MTSP_O_FSYNC O_SYNC
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#define MTSP_O_NOFOLLOW 0x0100
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#define MTSP_O_SYNC 0x0080
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#define MTSP_O_CREAT 0x0200
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#define MTSP_O_TRUNC 0x0400
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#define MTSP_O_EXCL 0x0800
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#define MTSP_O_BINARY 0x8000
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extern int tclimit;
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struct apsp_table {
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int sp;
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int ap;
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};
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/* we might want to do the mode flags too */
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struct apsp_table open_flags_table[] = {
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{ MTSP_O_RDWR, O_RDWR },
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{ MTSP_O_WRONLY, O_WRONLY },
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{ MTSP_O_CREAT, O_CREAT },
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{ MTSP_O_TRUNC, O_TRUNC },
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{ MTSP_O_NONBLOCK, O_NONBLOCK },
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{ MTSP_O_APPEND, O_APPEND },
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{ MTSP_O_NOFOLLOW, O_NOFOLLOW }
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};
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struct apsp_table syscall_command_table[] = {
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{ MTSP_SYSCALL_OPEN, __NR_open },
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{ MTSP_SYSCALL_CLOSE, __NR_close },
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{ MTSP_SYSCALL_READ, __NR_read },
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{ MTSP_SYSCALL_WRITE, __NR_write },
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{ MTSP_SYSCALL_LSEEK32, __NR_lseek },
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{ MTSP_SYSCALL_IOCTL, __NR_ioctl }
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};
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static int sp_syscall(int num, int arg0, int arg1, int arg2, int arg3)
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{
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register long int _num __asm__("$2") = num;
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register long int _arg0 __asm__("$4") = arg0;
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register long int _arg1 __asm__("$5") = arg1;
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register long int _arg2 __asm__("$6") = arg2;
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register long int _arg3 __asm__("$7") = arg3;
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mm_segment_t old_fs;
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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__asm__ __volatile__ (
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" syscall \n"
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: "=r" (_num), "=r" (_arg3)
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: "r" (_num), "r" (_arg0), "r" (_arg1), "r" (_arg2), "r" (_arg3));
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set_fs(old_fs);
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/* $a3 is error flag */
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if (_arg3)
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return -_num;
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return _num;
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}
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static int translate_syscall_command(int cmd)
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{
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int i;
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int ret = -1;
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for (i = 0; i < ARRAY_SIZE(syscall_command_table); i++) {
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if ((cmd == syscall_command_table[i].sp))
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return syscall_command_table[i].ap;
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}
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return ret;
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}
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static unsigned int translate_open_flags(int flags)
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{
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int i;
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unsigned int ret = 0;
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for (i = 0; i < ARRAY_SIZE(open_flags_table); i++) {
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if( (flags & open_flags_table[i].sp) ) {
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ret |= open_flags_table[i].ap;
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}
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}
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return ret;
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}
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static void sp_setfsuidgid( uid_t uid, gid_t gid)
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{
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current->fsuid = uid;
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current->fsgid = gid;
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key_fsuid_changed(current);
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key_fsgid_changed(current);
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}
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/*
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* Expects a request to be on the sysio channel. Reads it. Decides whether
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* its a linux syscall and runs it, or whatever. Puts the return code back
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* into the request and sends the whole thing back.
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*/
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void sp_work_handle_request(void)
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{
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struct mtsp_syscall sc;
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struct mtsp_syscall_generic generic;
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struct mtsp_syscall_ret ret;
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struct kspd_notifications *n;
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unsigned long written;
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mm_segment_t old_fs;
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struct timeval tv;
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struct timezone tz;
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int cmd;
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char *vcwd;
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int size;
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ret.retval = -1;
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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if (!rtlx_read(RTLX_CHANNEL_SYSIO, &sc, sizeof(struct mtsp_syscall))) {
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set_fs(old_fs);
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printk(KERN_ERR "Expected request but nothing to read\n");
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return;
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}
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size = sc.size;
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if (size) {
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if (!rtlx_read(RTLX_CHANNEL_SYSIO, &generic, size)) {
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set_fs(old_fs);
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printk(KERN_ERR "Expected request but nothing to read\n");
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return;
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}
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}
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/* Run the syscall at the privilege of the user who loaded the
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SP program */
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if (vpe_getuid(tclimit))
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sp_setfsuidgid(vpe_getuid(tclimit), vpe_getgid(tclimit));
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switch (sc.cmd) {
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/* needs the flags argument translating from SDE kit to
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linux */
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case MTSP_SYSCALL_PIPEFREQ:
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ret.retval = cpu_khz * 1000;
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ret.errno = 0;
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break;
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case MTSP_SYSCALL_GETTOD:
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memset(&tz, 0, sizeof(tz));
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if ((ret.retval = sp_syscall(__NR_gettimeofday, (int)&tv,
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(int)&tz, 0, 0)) == 0)
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ret.retval = tv.tv_sec;
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break;
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case MTSP_SYSCALL_EXIT:
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list_for_each_entry(n, &kspd_notifylist, list)
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n->kspd_sp_exit(tclimit);
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sp_stopping = 1;
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printk(KERN_DEBUG "KSPD got exit syscall from SP exitcode %d\n",
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generic.arg0);
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break;
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case MTSP_SYSCALL_OPEN:
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generic.arg1 = translate_open_flags(generic.arg1);
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vcwd = vpe_getcwd(tclimit);
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/* change to the cwd of the process that loaded the SP program */
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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sys_chdir(vcwd);
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set_fs(old_fs);
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sc.cmd = __NR_open;
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/* fall through */
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default:
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if ((sc.cmd >= __NR_Linux) &&
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(sc.cmd <= (__NR_Linux + __NR_Linux_syscalls)) )
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cmd = sc.cmd;
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else
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cmd = translate_syscall_command(sc.cmd);
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if (cmd >= 0) {
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ret.retval = sp_syscall(cmd, generic.arg0, generic.arg1,
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generic.arg2, generic.arg3);
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} else
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printk(KERN_WARNING
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"KSPD: Unknown SP syscall number %d\n", sc.cmd);
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break;
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} /* switch */
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if (vpe_getuid(tclimit))
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sp_setfsuidgid( 0, 0);
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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written = rtlx_write(RTLX_CHANNEL_SYSIO, &ret, sizeof(ret));
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set_fs(old_fs);
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if (written < sizeof(ret))
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printk("KSPD: sp_work_handle_request failed to send to SP\n");
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}
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static void sp_cleanup(void)
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{
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struct files_struct *files = current->files;
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int i, j;
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struct fdtable *fdt;
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j = 0;
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/*
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* It is safe to dereference the fd table without RCU or
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* ->file_lock
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*/
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fdt = files_fdtable(files);
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for (;;) {
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unsigned long set;
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i = j * __NFDBITS;
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if (i >= fdt->max_fds)
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break;
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set = fdt->open_fds->fds_bits[j++];
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while (set) {
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if (set & 1) {
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struct file * file = xchg(&fdt->fd[i], NULL);
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if (file)
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filp_close(file, files);
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}
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i++;
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set >>= 1;
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}
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}
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}
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static int channel_open = 0;
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/* the work handler */
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static void sp_work(struct work_struct *unused)
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{
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if (!channel_open) {
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if( rtlx_open(RTLX_CHANNEL_SYSIO, 1) != 0) {
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printk("KSPD: unable to open sp channel\n");
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sp_stopping = 1;
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} else {
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channel_open++;
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printk(KERN_DEBUG "KSPD: SP channel opened\n");
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}
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} else {
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/* wait for some data, allow it to sleep */
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rtlx_read_poll(RTLX_CHANNEL_SYSIO, 1);
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/* Check we haven't been woken because we are stopping */
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if (!sp_stopping)
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sp_work_handle_request();
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}
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if (!sp_stopping)
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queue_work(workqueue, &work);
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else
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sp_cleanup();
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}
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static void startwork(int vpe)
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{
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sp_stopping = channel_open = 0;
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if (workqueue == NULL) {
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if ((workqueue = create_singlethread_workqueue("kspd")) == NULL) {
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printk(KERN_ERR "unable to start kspd\n");
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return;
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}
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INIT_WORK(&work, sp_work);
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}
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queue_work(workqueue, &work);
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}
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static void stopwork(int vpe)
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{
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sp_stopping = 1;
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printk(KERN_DEBUG "KSPD: SP stopping\n");
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}
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void kspd_notify(struct kspd_notifications *notify)
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{
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list_add(¬ify->list, &kspd_notifylist);
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}
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static struct vpe_notifications notify;
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static int kspd_module_init(void)
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{
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INIT_LIST_HEAD(&kspd_notifylist);
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notify.start = startwork;
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notify.stop = stopwork;
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vpe_notify(tclimit, ¬ify);
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return 0;
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}
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static void kspd_module_exit(void)
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{
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}
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module_init(kspd_module_init);
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module_exit(kspd_module_exit);
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MODULE_DESCRIPTION("MIPS KSPD");
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MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
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MODULE_LICENSE("GPL");
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