diff options
Diffstat (limited to 'arch/mips/kernel/kspd.c')
| -rw-r--r-- | arch/mips/kernel/kspd.c | 423 |
1 files changed, 0 insertions, 423 deletions
diff --git a/arch/mips/kernel/kspd.c b/arch/mips/kernel/kspd.c deleted file mode 100644 index 29811f04339..00000000000 --- a/arch/mips/kernel/kspd.c +++ /dev/null @@ -1,423 +0,0 @@ -/* - * Copyright (C) 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. - * - */ -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/unistd.h> -#include <linux/file.h> -#include <linux/fdtable.h> -#include <linux/fs.h> -#include <linux/syscalls.h> -#include <linux/workqueue.h> -#include <linux/errno.h> -#include <linux/list.h> - -#include <asm/vpe.h> -#include <asm/rtlx.h> -#include <asm/kspd.h> - -static struct workqueue_struct *workqueue; -static struct work_struct work; - -extern unsigned long cpu_khz; - -struct mtsp_syscall { - int cmd; - unsigned char abi; - unsigned char size; -}; - -struct mtsp_syscall_ret { - int retval; - int errno; -}; - -struct mtsp_syscall_generic { - int arg0; - int arg1; - int arg2; - int arg3; - int arg4; - int arg5; - int arg6; -}; - -static struct list_head kspd_notifylist; -static int sp_stopping; - -/* these should match with those in the SDE kit */ -#define MTSP_SYSCALL_BASE 0 -#define MTSP_SYSCALL_EXIT (MTSP_SYSCALL_BASE + 0) -#define MTSP_SYSCALL_OPEN (MTSP_SYSCALL_BASE + 1) -#define MTSP_SYSCALL_READ (MTSP_SYSCALL_BASE + 2) -#define MTSP_SYSCALL_WRITE (MTSP_SYSCALL_BASE + 3) -#define MTSP_SYSCALL_CLOSE (MTSP_SYSCALL_BASE + 4) -#define MTSP_SYSCALL_LSEEK32 (MTSP_SYSCALL_BASE + 5) -#define MTSP_SYSCALL_ISATTY (MTSP_SYSCALL_BASE + 6) -#define MTSP_SYSCALL_GETTIME (MTSP_SYSCALL_BASE + 7) -#define MTSP_SYSCALL_PIPEFREQ (MTSP_SYSCALL_BASE + 8) -#define MTSP_SYSCALL_GETTOD (MTSP_SYSCALL_BASE + 9) -#define MTSP_SYSCALL_IOCTL (MTSP_SYSCALL_BASE + 10) - -#define MTSP_O_RDONLY 0x0000 -#define MTSP_O_WRONLY 0x0001 -#define MTSP_O_RDWR 0x0002 -#define MTSP_O_NONBLOCK 0x0004 -#define MTSP_O_APPEND 0x0008 -#define MTSP_O_SHLOCK 0x0010 -#define MTSP_O_EXLOCK 0x0020 -#define MTSP_O_ASYNC 0x0040 -/* XXX: check which of these is actually O_SYNC vs O_DSYNC */ -#define MTSP_O_FSYNC O_SYNC -#define MTSP_O_NOFOLLOW 0x0100 -#define MTSP_O_SYNC 0x0080 -#define MTSP_O_CREAT 0x0200 -#define MTSP_O_TRUNC 0x0400 -#define MTSP_O_EXCL 0x0800 -#define MTSP_O_BINARY 0x8000 - -extern int tclimit; - -struct apsp_table { - int sp; - int ap; -}; - -/* we might want to do the mode flags too */ -struct apsp_table open_flags_table[] = { - { MTSP_O_RDWR, O_RDWR }, - { MTSP_O_WRONLY, O_WRONLY }, - { MTSP_O_CREAT, O_CREAT }, - { MTSP_O_TRUNC, O_TRUNC }, - { MTSP_O_NONBLOCK, O_NONBLOCK }, - { MTSP_O_APPEND, O_APPEND }, - { MTSP_O_NOFOLLOW, O_NOFOLLOW } -}; - -struct apsp_table syscall_command_table[] = { - { MTSP_SYSCALL_OPEN, __NR_open }, - { MTSP_SYSCALL_CLOSE, __NR_close }, - { MTSP_SYSCALL_READ, __NR_read }, - { MTSP_SYSCALL_WRITE, __NR_write }, - { MTSP_SYSCALL_LSEEK32, __NR_lseek }, - { MTSP_SYSCALL_IOCTL, __NR_ioctl } -}; - -static int sp_syscall(int num, int arg0, int arg1, int arg2, int arg3) -{ - register long int _num __asm__("$2") = num; - register long int _arg0 __asm__("$4") = arg0; - register long int _arg1 __asm__("$5") = arg1; - register long int _arg2 __asm__("$6") = arg2; - register long int _arg3 __asm__("$7") = arg3; - - mm_segment_t old_fs; - - old_fs = get_fs(); - set_fs(KERNEL_DS); - - __asm__ __volatile__ ( - " syscall \n" - : "=r" (_num), "=r" (_arg3) - : "r" (_num), "r" (_arg0), "r" (_arg1), "r" (_arg2), "r" (_arg3)); - - set_fs(old_fs); - - /* $a3 is error flag */ - if (_arg3) - return -_num; - - return _num; -} - -static int translate_syscall_command(int cmd) -{ - int i; - int ret = -1; - - for (i = 0; i < ARRAY_SIZE(syscall_command_table); i++) { - if ((cmd == syscall_command_table[i].sp)) - return syscall_command_table[i].ap; - } - - return ret; -} - -static unsigned int translate_open_flags(int flags) -{ - int i; - unsigned int ret = 0; - - for (i = 0; i < ARRAY_SIZE(open_flags_table); i++) { - if( (flags & open_flags_table[i].sp) ) { - ret |= open_flags_table[i].ap; - } - } - - return ret; -} - - -static int sp_setfsuidgid(uid_t uid, gid_t gid) -{ - struct cred *new; - - new = prepare_creds(); - if (!new) - return -ENOMEM; - - new->fsuid = uid; - new->fsgid = gid; - - commit_creds(new); - - return 0; -} - -/* - * Expects a request to be on the sysio channel. Reads it. Decides whether - * its a linux syscall and runs it, or whatever. Puts the return code back - * into the request and sends the whole thing back. - */ -void sp_work_handle_request(void) -{ - struct mtsp_syscall sc; - struct mtsp_syscall_generic generic; - struct mtsp_syscall_ret ret; - struct kspd_notifications *n; - unsigned long written; - mm_segment_t old_fs; - struct timeval tv; - struct timezone tz; - int err, cmd; - - char *vcwd; - int size; - - ret.retval = -1; - - old_fs = get_fs(); - set_fs(KERNEL_DS); - - if (!rtlx_read(RTLX_CHANNEL_SYSIO, &sc, sizeof(struct mtsp_syscall))) { - set_fs(old_fs); - printk(KERN_ERR "Expected request but nothing to read\n"); - return; - } - - size = sc.size; - - if (size) { - if (!rtlx_read(RTLX_CHANNEL_SYSIO, &generic, size)) { - set_fs(old_fs); - printk(KERN_ERR "Expected request but nothing to read\n"); - return; - } - } - - /* Run the syscall at the privilege of the user who loaded the - SP program */ - - if (vpe_getuid(tclimit)) { - err = sp_setfsuidgid(vpe_getuid(tclimit), vpe_getgid(tclimit)); - if (!err) - pr_err("Change of creds failed\n"); - } - - switch (sc.cmd) { - /* needs the flags argument translating from SDE kit to - linux */ - case MTSP_SYSCALL_PIPEFREQ: - ret.retval = cpu_khz * 1000; - ret.errno = 0; - break; - - case MTSP_SYSCALL_GETTOD: - memset(&tz, 0, sizeof(tz)); - if ((ret.retval = sp_syscall(__NR_gettimeofday, (int)&tv, - (int)&tz, 0, 0)) == 0) - ret.retval = tv.tv_sec; - break; - - case MTSP_SYSCALL_EXIT: - list_for_each_entry(n, &kspd_notifylist, list) - n->kspd_sp_exit(tclimit); - sp_stopping = 1; - - printk(KERN_DEBUG "KSPD got exit syscall from SP exitcode %d\n", - generic.arg0); - break; - - case MTSP_SYSCALL_OPEN: - generic.arg1 = translate_open_flags(generic.arg1); - - vcwd = vpe_getcwd(tclimit); - - /* change to cwd of the process that loaded the SP program */ - old_fs = get_fs(); - set_fs(KERNEL_DS); - sys_chdir(vcwd); - set_fs(old_fs); - - sc.cmd = __NR_open; - - /* fall through */ - - default: - if ((sc.cmd >= __NR_Linux) && - (sc.cmd <= (__NR_Linux + __NR_Linux_syscalls)) ) - cmd = sc.cmd; - else - cmd = translate_syscall_command(sc.cmd); - - if (cmd >= 0) { - ret.retval = sp_syscall(cmd, generic.arg0, generic.arg1, - generic.arg2, generic.arg3); - } else - printk(KERN_WARNING - "KSPD: Unknown SP syscall number %d\n", sc.cmd); - break; - } /* switch */ - - if (vpe_getuid(tclimit)) { - err = sp_setfsuidgid(0, 0); - if (!err) - pr_err("restoring old creds failed\n"); - } - - old_fs = get_fs(); - set_fs(KERNEL_DS); - written = rtlx_write(RTLX_CHANNEL_SYSIO, &ret, sizeof(ret)); - set_fs(old_fs); - if (written < sizeof(ret)) - printk("KSPD: sp_work_handle_request failed to send to SP\n"); -} - -static void sp_cleanup(void) -{ - struct files_struct *files = current->files; - int i, j; - struct fdtable *fdt; - - j = 0; - - /* - * It is safe to dereference the fd table without RCU or - * ->file_lock - */ - fdt = files_fdtable(files); - for (;;) { - unsigned long set; - i = j * __NFDBITS; - if (i >= fdt->max_fds) - break; - set = fdt->open_fds->fds_bits[j++]; - while (set) { - if (set & 1) { - struct file * file = xchg(&fdt->fd[i], NULL); - if (file) - filp_close(file, files); - } - i++; - set >>= 1; - } - } - - /* Put daemon cwd back to root to avoid umount problems */ - sys_chdir("/"); -} - -static int channel_open; - -/* the work handler */ -static void sp_work(struct work_struct *unused) -{ - if (!channel_open) { - if( rtlx_open(RTLX_CHANNEL_SYSIO, 1) != 0) { - printk("KSPD: unable to open sp channel\n"); - sp_stopping = 1; - } else { - channel_open++; - printk(KERN_DEBUG "KSPD: SP channel opened\n"); - } - } else { - /* wait for some data, allow it to sleep */ - rtlx_read_poll(RTLX_CHANNEL_SYSIO, 1); - - /* Check we haven't been woken because we are stopping */ - if (!sp_stopping) - sp_work_handle_request(); - } - - if (!sp_stopping) - queue_work(workqueue, &work); - else - sp_cleanup(); -} - -static void startwork(int vpe) -{ - sp_stopping = channel_open = 0; - - if (workqueue == NULL) { - if ((workqueue = create_singlethread_workqueue("kspd")) == NULL) { - printk(KERN_ERR "unable to start kspd\n"); - return; - } - - INIT_WORK(&work, sp_work); - } - - queue_work(workqueue, &work); -} - -static void stopwork(int vpe) -{ - sp_stopping = 1; - - printk(KERN_DEBUG "KSPD: SP stopping\n"); -} - -void kspd_notify(struct kspd_notifications *notify) -{ - list_add(¬ify->list, &kspd_notifylist); -} - -static struct vpe_notifications notify; -static int kspd_module_init(void) -{ - INIT_LIST_HEAD(&kspd_notifylist); - - notify.start = startwork; - notify.stop = stopwork; - vpe_notify(tclimit, ¬ify); - - return 0; -} - -static void kspd_module_exit(void) -{ - -} - -module_init(kspd_module_init); -module_exit(kspd_module_exit); - -MODULE_DESCRIPTION("MIPS KSPD"); -MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); -MODULE_LICENSE("GPL"); |