/*
 *  linux/arch/alpha/kernel/osf_sys.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 */

/*
 * This file handles some of the stranger OSF/1 system call interfaces.
 * Some of the system calls expect a non-C calling standard, others have
 * special parameter blocks..
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/utsname.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/major.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/shm.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/types.h>
#include <linux/ipc.h>

#include <asm/fpu.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/sysinfo.h>
#include <asm/hwrpb.h>
#include <asm/processor.h>

extern int do_pipe(int *);

extern asmlinkage unsigned long sys_brk(unsigned long);

/*
 * Brk needs to return an error.  Still support Linux's brk(0) query idiom,
 * which OSF programs just shouldn't be doing.  We're still not quite
 * identical to OSF as we don't return 0 on success, but doing otherwise
 * would require changes to libc.  Hopefully this is good enough.
 */
asmlinkage unsigned long osf_brk(unsigned long brk)
{
        unsigned long retval = sys_brk(brk);
        if (brk && brk != retval)
                retval = -ENOMEM;
        return retval;
}
 
/*
 * This is pure guess-work..
 */
asmlinkage int osf_set_program_attributes(
        unsigned long text_start, unsigned long text_len,
        unsigned long bss_start, unsigned long bss_len)
{
        struct mm_struct *mm;

        lock_kernel();
        mm = current->mm;
        mm->end_code = bss_start + bss_len;
        mm->brk = bss_start + bss_len;
#if 0
        printk("set_program_attributes(%lx %lx %lx %lx)\n",
                text_start, text_len, bss_start, bss_len);
#endif
        unlock_kernel();
        return 0;
}

/*
 * OSF/1 directory handling functions...
 *
 * The "getdents()" interface is much more sane: the "basep" stuff is
 * braindamage (it can't really handle filesystems where the directory
 * offset differences aren't the same as "d_reclen").
 */
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
#define ROUND_UP(x) (((x)+3) & ~3)

struct osf_dirent {
        unsigned int d_ino;
        unsigned short d_reclen;
        unsigned short d_namlen;
        char d_name[1];
};

struct osf_dirent_callback {
        struct osf_dirent *dirent;
        long *basep;
        int count;
        int error;
};

static int osf_filldir(void *__buf, const char *name, int namlen, loff_t offset,
                       ino_t ino, unsigned int d_type)
{
        struct osf_dirent *dirent;
        struct osf_dirent_callback *buf = (struct osf_dirent_callback *) __buf;
        int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1);

        buf->error = -EINVAL;   /* only used if we fail */
        if (reclen > buf->count)
                return -EINVAL;
        if (buf->basep) {
                put_user(offset, buf->basep);
                buf->basep = NULL;
        }
        dirent = buf->dirent;
        put_user(ino, &dirent->d_ino);
        put_user(namlen, &dirent->d_namlen);
        put_user(reclen, &dirent->d_reclen);
        copy_to_user(dirent->d_name, name, namlen);
        put_user(0, dirent->d_name + namlen);
        ((char *) dirent) += reclen;
        buf->dirent = dirent;
        buf->count -= reclen;
        return 0;
}

asmlinkage int osf_getdirentries(unsigned int fd, struct osf_dirent *dirent,
                                 unsigned int count, long *basep)
{
        int error;
        struct file *file;
        struct osf_dirent_callback buf;

        error = -EBADF;
        file = fget(fd);
        if (!file)
                goto out;

        buf.dirent = dirent;
        buf.basep = basep;
        buf.count = count;
        buf.error = 0;

        error = vfs_readdir(file, osf_filldir, &buf);
        if (error < 0)
                goto out_putf;

        error = buf.error;
        if (count != buf.count)
                error = count - buf.count;

out_putf:
        fput(file);
out:
        return error;
}

#undef ROUND_UP
#undef NAME_OFFSET

/*
 * Alpha syscall convention has no problem returning negative
 * values:
 */
asmlinkage int osf_getpriority(int which, int who, int a2, int a3, int a4,
                               int a5, struct pt_regs regs)
{
        extern int sys_getpriority(int, int);
        int prio;

        /*
         * We don't need to acquire the kernel lock here, because
         * all of these operations are local. sys_getpriority
         * will get the lock as required..
         */
        prio = sys_getpriority(which, who);
        if (prio >= 0) {
                regs.r0 = 0;            /* special return: no errors */
                prio = 20 - prio;
        }
        return prio;
}

/*
 * No need to acquire the kernel lock, we're local..
 */
asmlinkage unsigned long sys_getxuid(int a0, int a1, int a2, int a3, int a4,
                                     int a5, struct pt_regs regs)
{
        struct task_struct * tsk = current;
        (&regs)->r20 = tsk->euid;
        return tsk->uid;
}

asmlinkage unsigned long sys_getxgid(int a0, int a1, int a2, int a3, int a4,
                                     int a5, struct pt_regs regs)
{
        struct task_struct * tsk = current;
        (&regs)->r20 = tsk->egid;
        return tsk->gid;
}

asmlinkage unsigned long sys_getxpid(int a0, int a1, int a2, int a3, int a4,
                                     int a5, struct pt_regs regs)
{
        struct task_struct *tsk = current;

        /* 
         * This isn't strictly "local" any more and we should actually
         * acquire the kernel lock. The "p_opptr" pointer might change
         * if the parent goes away (or due to ptrace). But any race
         * isn't actually going to matter, as if the parent happens
         * to change we can happily return either of the pids.
         */
        (&regs)->r20 = tsk->p_opptr->tgid;
        return tsk->tgid;
}

asmlinkage unsigned long osf_mmap(unsigned long addr, unsigned long len,
               unsigned long prot, unsigned long flags, unsigned long fd,
                                  unsigned long off)
{
        struct file *file = NULL;
        unsigned long ret = -EBADF;

#if 0
        if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED))
                printk("%s: unimplemented OSF mmap flags %04lx\n", 
                        current->comm, flags);
#endif
        if (!(flags & MAP_ANONYMOUS)) {
                file = fget(fd);
                if (!file)
                        goto out;
        }
        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
        down_write(&current->mm->mmap_sem);
        ret = do_mmap(file, addr, len, prot, flags, off);
        up_write(&current->mm->mmap_sem);
        if (file)
                fput(file);
out:
        return ret;
}


/*
 * The OSF/1 statfs structure is much larger, but this should
 * match the beginning, at least.
 */
struct osf_statfs {
        short f_type;
        short f_flags;
        int f_fsize;
        int f_bsize;
        int f_blocks;
        int f_bfree;
        int f_bavail;
        int f_files;
        int f_ffree;
        __kernel_fsid_t f_fsid;
} *osf_stat;

static int linux_to_osf_statfs(struct statfs *linux_stat, struct osf_statfs *osf_stat, unsigned long bufsiz)
{
        struct osf_statfs tmp_stat;

        tmp_stat.f_type = linux_stat->f_type;
        tmp_stat.f_flags = 0;   /* mount flags */
        /* Linux doesn't provide a "fundamental filesystem block size": */
        tmp_stat.f_fsize = linux_stat->f_bsize;
        tmp_stat.f_bsize = linux_stat->f_bsize;
        tmp_stat.f_blocks = linux_stat->f_blocks;
        tmp_stat.f_bfree = linux_stat->f_bfree;
        tmp_stat.f_bavail = linux_stat->f_bavail;
        tmp_stat.f_files = linux_stat->f_files;
        tmp_stat.f_ffree = linux_stat->f_ffree;
        tmp_stat.f_fsid = linux_stat->f_fsid;
        if (bufsiz > sizeof(tmp_stat))
                bufsiz = sizeof(tmp_stat);
        return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
}

static int do_osf_statfs(struct dentry * dentry, struct osf_statfs *buffer, unsigned long bufsiz)
{
        struct statfs linux_stat;
        int error = vfs_statfs(dentry->d_inode->i_sb, &linux_stat);
        if (!error)
                error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
        return error;   
}

asmlinkage int osf_statfs(char *path, struct osf_statfs *buffer, unsigned long bufsiz)
{
        struct nameidata nd;
        int retval;

        retval = user_path_walk(path, &nd);
        if (!retval) {
                retval = do_osf_statfs(nd.dentry, buffer, bufsiz);
                path_release(&nd);
        }
        return retval;
}

asmlinkage int osf_fstatfs(unsigned long fd, struct osf_statfs *buffer, unsigned long bufsiz)
{
        struct file *file;
        int retval;

        retval = -EBADF;
        file = fget(fd);
        if (file) {
                retval = do_osf_statfs(file->f_dentry, buffer, bufsiz);
                fput(file);
        }
        return retval;
}

/*
 * Uhh.. OSF/1 mount parameters aren't exactly obvious..
 *
 * Although to be frank, neither are the native Linux/i386 ones..
 */
struct ufs_args {
        char *devname;
        int flags;
        uid_t exroot;
};

struct cdfs_args {
        char *devname;
        int flags;
        uid_t exroot;
/*
 * This has lots more here, which Linux handles with the option block
 * but I'm too lazy to do the translation into ASCII.
 */
};

struct procfs_args {
        char *devname;
        int flags;
        uid_t exroot;
};

/*
 * We can't actually handle ufs yet, so we translate UFS mounts to
 * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS
 * layout is so braindead it's a major headache doing it.
 *
 * Just how long ago was it written? OTOH our UFS driver may be still
 * unhappy with OSF UFS. [CHECKME]
 */
static int osf_ufs_mount(char *dirname, struct ufs_args *args, int flags)
{
        int retval;
        struct cdfs_args tmp;
        char *devname;

        retval = -EFAULT;
        if (copy_from_user(&tmp, args, sizeof(tmp)))
                goto out;
        devname = getname(tmp.devname);
        retval = PTR_ERR(devname);
        if (IS_ERR(devname))
                goto out;
        retval = do_mount(devname, dirname, "ext2", flags, NULL);
        putname(devname);
out:
        return retval;
}

static int osf_cdfs_mount(char *dirname, struct cdfs_args *args, int flags)
{
        int retval;
        struct cdfs_args tmp;
        char *devname;

        retval = -EFAULT;
        if (copy_from_user(&tmp, args, sizeof(tmp)))
                goto out;
        devname = getname(tmp.devname);
        retval = PTR_ERR(devname);
        if (IS_ERR(devname))
                goto out;
        retval = do_mount(devname, dirname, "iso9660", flags, NULL);
        putname(devname);
out:
        return retval;
}

static int osf_procfs_mount(char *dirname, struct procfs_args *args, int flags)
{
        struct procfs_args tmp;

        if (copy_from_user(&tmp, args, sizeof(tmp)))
                return -EFAULT;

        return do_mount("", dirname, "proc", flags, NULL);
}

asmlinkage int osf_mount(unsigned long typenr, char *path, int flag, void *data)
{
        int retval = -EINVAL;
        char *name;

        lock_kernel();

        name = getname(path);
        retval = PTR_ERR(name);
        if (IS_ERR(name))
                goto out;
        switch (typenr) {
        case 1:
                retval = osf_ufs_mount(name, (struct ufs_args *) data, flag);
                break;
        case 6:
                retval = osf_cdfs_mount(name, (struct cdfs_args *) data, flag);
                break;
        case 9:
                retval = osf_procfs_mount(name, (struct procfs_args *) data, flag);
                break;
        default:
                printk("osf_mount(%ld, %x)\n", typenr, flag);
        }
        putname(name);
out:
        unlock_kernel();
        return retval;
}

asmlinkage int osf_utsname(char *name)
{
        int error;

        down_read(&uts_sem);
        error = -EFAULT;
        if (copy_to_user(name + 0, system_utsname.sysname, 32))
                goto out;
        if (copy_to_user(name + 32, system_utsname.nodename, 32))
                goto out;
        if (copy_to_user(name + 64, system_utsname.release, 32))
                goto out;
        if (copy_to_user(name + 96, system_utsname.version, 32))
                goto out;
        if (copy_to_user(name + 128, system_utsname.machine, 32))
                goto out;

        error = 0;
out:
        up_read(&uts_sem);      
        return error;
}

asmlinkage int osf_swapon(const char *path, int flags, int lowat, int hiwat)
{
        /* for now, simply ignore lowat and hiwat... */
        return sys_swapon(path, flags);
}

asmlinkage unsigned long sys_getpagesize(void)
{
        return PAGE_SIZE;
}

asmlinkage unsigned long sys_getdtablesize(void)
{
        return NR_OPEN;
}

asmlinkage int sys_pipe(int a0, int a1, int a2, int a3, int a4, int a5,
                        struct pt_regs regs)
{
        int fd[2];
        int error;

        error = do_pipe(fd);
        if (error)
                goto out;
        (&regs)->r20 = fd[1];
        error = fd[0];
out:
        return error;
}

/*
 * For compatibility with OSF/1 only.  Use utsname(2) instead.
 */
asmlinkage int osf_getdomainname(char *name, int namelen)
{
        unsigned len;
        int i, error;

        error = verify_area(VERIFY_WRITE, name, namelen);
        if (error)
                goto out;

        len = namelen;
        if (namelen > 32)
                len = 32;

        down_read(&uts_sem);
        for (i = 0; i < len; ++i) {
                __put_user(system_utsname.domainname[i], name + i);
                if (system_utsname.domainname[i] == '\0')
                        break;
        }
        up_read(&uts_sem);
out:
        return error;
}


asmlinkage long osf_shmat(int shmid, void *shmaddr, int shmflg)
{
        unsigned long raddr;
        long err;

        err = sys_shmat(shmid, shmaddr, shmflg, &raddr);

        /*
         * This works because all user-level addresses are
         * non-negative longs!
         */
        return err ? err : (long)raddr;
}


/*
 * The following stuff should move into a header file should it ever
 * be labeled "officially supported."  Right now, there is just enough
 * support to avoid applications (such as tar) printing error
 * messages.  The attributes are not really implemented.
 */

/*
 * Values for Property list entry flag
 */
#define PLE_PROPAGATE_ON_COPY           0x1     /* cp(1) will copy entry
                                                   by default */
#define PLE_FLAG_MASK                   0x1     /* Valid flag values */
#define PLE_FLAG_ALL                    -1      /* All flag value */

struct proplistname_args {
        unsigned int pl_mask;
        unsigned int pl_numnames;
        char **pl_names;
};

union pl_args {
        struct setargs {
                char *path;
                long follow;
                long nbytes;
                char *buf;
        } set;
        struct fsetargs {
                long fd;
                long nbytes;
                char *buf;
        } fset;
        struct getargs {
                char *path;
                long follow;
                struct proplistname_args *name_args;
                long nbytes;
                char *buf;
                int *min_buf_size;
        } get;
        struct fgetargs {
                long fd;
                struct proplistname_args *name_args;
                long nbytes;
                char *buf;
                int *min_buf_size;
        } fget;
        struct delargs {
                char *path;
                long follow;
                struct proplistname_args *name_args;
        } del;
        struct fdelargs {
                long fd;
                struct proplistname_args *name_args;
        } fdel;
};

enum pl_code {
        PL_SET = 1, PL_FSET = 2,
        PL_GET = 3, PL_FGET = 4,
        PL_DEL = 5, PL_FDEL = 6
};

asmlinkage long osf_proplist_syscall(enum pl_code code, union pl_args *args)
{
        long error;
        int *min_buf_size_ptr;

        lock_kernel();
        switch (code) {
        case PL_SET:
                error = verify_area(VERIFY_READ, &args->set.nbytes,
                                    sizeof(args->set.nbytes));
                if (!error)
                        error = args->set.nbytes;
                break;
        case PL_FSET:
                error = verify_area(VERIFY_READ, &args->fset.nbytes,
                                    sizeof(args->fset.nbytes));
                if (!error)
                        error = args->fset.nbytes;
                break;
        case PL_GET:
                get_user(min_buf_size_ptr, &args->get.min_buf_size);
                error = verify_area(VERIFY_WRITE, min_buf_size_ptr,
                                    sizeof(*min_buf_size_ptr));
                if (!error)
                        put_user(0, min_buf_size_ptr);
                break;
        case PL_FGET:
                get_user(min_buf_size_ptr, &args->fget.min_buf_size);
                error = verify_area(VERIFY_WRITE, min_buf_size_ptr,
                                    sizeof(*min_buf_size_ptr));
                if (!error)
                        put_user(0, min_buf_size_ptr);
                break;
        case PL_DEL:
        case PL_FDEL:
                error = 0;
                break;
        default:
                error = -EOPNOTSUPP;
                break;
        };
        unlock_kernel();
        return error;
}

asmlinkage int osf_sigstack(struct sigstack *uss, struct sigstack *uoss)
{
        unsigned long usp = rdusp();
        unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
        unsigned long oss_os = on_sig_stack(usp);
        int error;

        if (uss) {
                void *ss_sp;

                error = -EFAULT;
                if (get_user(ss_sp, &uss->ss_sp))
                        goto out;

                /* If the current stack was set with sigaltstack, don't
                   swap stacks while we are on it.  */
                error = -EPERM;
                if (current->sas_ss_sp && on_sig_stack(usp))
                        goto out;

                /* Since we don't know the extent of the stack, and we don't
                   track onstack-ness, but rather calculate it, we must 
                   presume a size.  Ho hum this interface is lossy.  */
                current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
                current->sas_ss_size = SIGSTKSZ;
        }

        if (uoss) {
                error = -EFAULT;
                if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
                    || __put_user(oss_sp, &uoss->ss_sp)
                    || __put_user(oss_os, &uoss->ss_onstack))
                        goto out;
        }

        error = 0;
out:
        return error;
}

/*
 * The Linux kernel isn't good at returning values that look
 * like negative longs (they are mistaken as error values).
 * Until that is fixed, we need this little workaround for
 * create_module() because it's one of the few system calls
 * that return kernel addresses (which are negative).
 */
asmlinkage unsigned long alpha_create_module(char *module_name, unsigned long size,
                                          int a3, int a4, int a5, int a6,
                                             struct pt_regs regs)
{
        asmlinkage unsigned long sys_create_module(char *, unsigned long);
        long retval;

        lock_kernel();
        retval = sys_create_module(module_name, size);
        /*
         * we get either a module address or an error number,
         * and we know the error number is a small negative
         * number, while the address is always negative but
         * much larger.
         */
        if (retval + 1000 > 0)
                goto out;

        /* tell entry.S:syscall_error that this is NOT an error: */
        regs.r0 = 0;
out:
        unlock_kernel();
        return retval;
}

asmlinkage long osf_sysinfo(int command, char *buf, long count)
{
        static char * sysinfo_table[] = {
                system_utsname.sysname,
                system_utsname.nodename,
                system_utsname.release,
                system_utsname.version,
                system_utsname.machine,
                "alpha",        /* instruction set architecture */
                "dummy",        /* hardware serial number */
                "dummy",        /* hardware manufacturer */
                "dummy",        /* secure RPC domain */
        };
        unsigned long offset;
        char *res;
        long len, err = -EINVAL;

        offset = command-1;
        if (offset >= sizeof(sysinfo_table)/sizeof(char *)) {
                /* Digital UNIX has a few unpublished interfaces here */
                printk("sysinfo(%d)", command);
                goto out;
        }
        
        down_read(&uts_sem);
        res = sysinfo_table[offset];
        len = strlen(res)+1;
        if (len > count)
                len = count;
        if (copy_to_user(buf, res, len))
                err = -EFAULT;
        else
                err = 0;
        up_read(&uts_sem);
out:
        return err;
}

asmlinkage unsigned long osf_getsysinfo(unsigned long op, void *buffer,
                                        unsigned long nbytes,
                                        int *start, void *arg)
{
        unsigned long w;
        struct percpu_struct *cpu;

        switch (op) {
        case GSI_IEEE_FP_CONTROL:
                /* Return current software fp control & status bits.  */
                /* Note that DU doesn't verify available space here.  */

                w = current->thread.flags & IEEE_SW_MASK;
                w = swcr_update_status(w, rdfpcr());
                if (put_user(w, (unsigned long *) buffer))
                        return -EFAULT;
                return 0;

        case GSI_IEEE_STATE_AT_SIGNAL:
                /*
                 * Not sure anybody will ever use this weird stuff.  These
                 * ops can be used (under OSF/1) to set the fpcr that should
                 * be used when a signal handler starts executing.
                 */
                break;

        case GSI_UACPROC:
                if (nbytes < sizeof(unsigned int))
                        return -EINVAL;
                w = (current->thread.flags >> UAC_SHIFT) & UAC_BITMASK;
                if (put_user(w, (unsigned int *)buffer))
                        return -EFAULT;
                return 1;

        case GSI_PROC_TYPE:
                if (nbytes < sizeof(unsigned long))
                        return -EINVAL;
                cpu = (struct percpu_struct*)
                  ((char*)hwrpb + hwrpb->processor_offset);
                w = cpu->type;
                if (put_user(w, (unsigned long *)buffer))
                        return -EFAULT;
                return 1;

        case GSI_GET_HWRPB:
                if (nbytes < sizeof(*hwrpb))
                        return -EINVAL;
                if (copy_to_user(buffer, hwrpb, nbytes) != 0)
                        return -EFAULT;
                return 1;

        default:
                break;
        }

        return -EOPNOTSUPP;
}

asmlinkage unsigned long osf_setsysinfo(unsigned long op, void *buffer,
                                        unsigned long nbytes,
                                        int *start, void *arg)
{
        switch (op) {
        case SSI_IEEE_FP_CONTROL: {
                unsigned long swcr, fpcr;

                /* 
                 * Alpha Architecture Handbook 4.7.7.3:
                 * To be fully IEEE compiant, we must track the current IEEE
                 * exception state in software, because spurrious bits can be
                 * set in the trap shadow of a software-complete insn.
                 */

                /* Update softare trap enable bits.  */
                if (get_user(swcr, (unsigned long *)buffer))
                        return -EFAULT;
                current->thread.flags &= ~IEEE_SW_MASK;
                current->thread.flags |= swcr & IEEE_SW_MASK;

                /* Update the real fpcr.  */
                fpcr = rdfpcr();
                fpcr &= FPCR_DYN_MASK;
                fpcr |= ieee_swcr_to_fpcr(swcr);
                wrfpcr(fpcr);

                /* If any exceptions are now unmasked, send a signal.  */
                if (((swcr & IEEE_STATUS_MASK)
                     >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr) {
                        send_sig(SIGFPE, current, 1);
                }

                return 0;
        }

        case SSI_IEEE_STATE_AT_SIGNAL:
        case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
                /*
                 * Not sure anybody will ever use this weird stuff.  These
                 * ops can be used (under OSF/1) to set the fpcr that should
                 * be used when a signal handler starts executing.
                 */
                break;

        case SSI_NVPAIRS: {
                unsigned long v, w, i;
                
                for (i = 0; i < nbytes; ++i) {
                        if (get_user(v, 2*i + (unsigned int *)buffer))
                                return -EFAULT;
                        if (get_user(w, 2*i + 1 + (unsigned int *)buffer))
                                return -EFAULT;
                        switch (v) {
                        case SSIN_UACPROC:
                                current->thread.flags &=
                                        ~(UAC_BITMASK << UAC_SHIFT);
                                current->thread.flags |=
                                        (w & UAC_BITMASK) << UAC_SHIFT;
                                break;
 
                        default:
                                return -EOPNOTSUPP;
                        }
                }
                return 0;
        }
 
        default:
                break;
        }

        return -EOPNOTSUPP;
}

/* Translations due to the fact that OSF's time_t is an int.  Which
   affects all sorts of things, like timeval and itimerval.  */

extern struct timezone sys_tz;
extern int do_sys_settimeofday(struct timeval *tv, struct timezone *tz);
extern int do_getitimer(int which, struct itimerval *value);
extern int do_setitimer(int which, struct itimerval *, struct itimerval *);
asmlinkage int sys_utimes(char *, struct timeval *);
extern int do_adjtimex(struct timex *);

struct timeval32
{
    int tv_sec, tv_usec;
};

struct itimerval32
{
    struct timeval32 it_interval;
    struct timeval32 it_value;
};

static inline long get_tv32(struct timeval *o, struct timeval32 *i)
{
        return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
                (__get_user(o->tv_sec, &i->tv_sec) |
                 __get_user(o->tv_usec, &i->tv_usec)));
}

static inline long put_tv32(struct timeval32 *o, struct timeval *i)
{
        return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
                (__put_user(i->tv_sec, &o->tv_sec) |
                 __put_user(i->tv_usec, &o->tv_usec)));
}

static inline long get_it32(struct itimerval *o, struct itimerval32 *i)
{
        return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
                (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
                 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
                 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
                 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
}

static inline long put_it32(struct itimerval32 *o, struct itimerval *i)
{
        return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
                (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
                 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
                 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
                 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
}

asmlinkage int osf_gettimeofday(struct timeval32 *tv, struct timezone *tz)
{
        if (tv) {
                struct timeval ktv;
                do_gettimeofday(&ktv);
                if (put_tv32(tv, &ktv))
                        return -EFAULT;
        }
        if (tz) {
                if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
                        return -EFAULT;
        }
        return 0;
}

asmlinkage int osf_settimeofday(struct timeval32 *tv, struct timezone *tz)
{
        struct timeval ktv;
        struct timezone ktz;

        if (tv) {
                if (get_tv32(&ktv, tv))
                        return -EFAULT;
        }
        if (tz) {
                if (copy_from_user(&ktz, tz, sizeof(*tz)))
                        return -EFAULT;
        }

        return do_sys_settimeofday(tv ? &ktv : NULL, tz ? &ktz : NULL);
}

asmlinkage int osf_getitimer(int which, struct itimerval32 *it)
{
        struct itimerval kit;
        int error;

        error = do_getitimer(which, &kit);
        if (!error && put_it32(it, &kit))
                error = -EFAULT;

        return error;
}

asmlinkage int osf_setitimer(int which, struct itimerval32 *in,
                             struct itimerval32 *out)
{
        struct itimerval kin, kout;
        int error;

        if (in) {
                if (get_it32(&kin, in))
                        return -EFAULT;
        } else
                memset(&kin, 0, sizeof(kin));

        error = do_setitimer(which, &kin, out ? &kout : NULL);
        if (error || !out)

                return error;

        if (put_it32(out, &kout))
                return -EFAULT;

        return 0;

}

asmlinkage int osf_utimes(const char *filename, struct timeval32 *tvs)
{
        char *kfilename;
        struct timeval ktvs[2];
        mm_segment_t old_fs;
        int ret;

        kfilename = getname(filename);
        if (IS_ERR(kfilename))
                return PTR_ERR(kfilename);

        if (tvs) {
                if (get_tv32(&ktvs[0], &tvs[0]) ||
                    get_tv32(&ktvs[1], &tvs[1]))
                        return -EFAULT;
        }

        old_fs = get_fs();
        set_fs(KERNEL_DS);
        ret = sys_utimes(kfilename, tvs ? ktvs : 0);
        set_fs(old_fs);

        putname(kfilename);

        return ret;
}

#define MAX_SELECT_SECONDS \
        ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)

asmlinkage int
osf_select(int n, fd_set *inp, fd_set *outp, fd_set *exp,
           struct timeval32 *tvp)
{
        fd_set_bits fds;
        char *bits;
        size_t size;
        unsigned long timeout;
        int ret;

        timeout = MAX_SCHEDULE_TIMEOUT;
        if (tvp) {
                time_t sec, usec;

                if ((ret = verify_area(VERIFY_READ, tvp, sizeof(*tvp)))
                    || (ret = __get_user(sec, &tvp->tv_sec))
                    || (ret = __get_user(usec, &tvp->tv_usec)))
                        goto out_nofds;

                ret = -EINVAL;
                if (sec < 0 || usec < 0)
                        goto out_nofds;

                if ((unsigned long) sec < MAX_SELECT_SECONDS) {
                        timeout = (usec + 1000000/HZ - 1) / (1000000/HZ);
                        timeout += sec * (unsigned long) HZ;
                }
        }

        ret = -EINVAL;
        if (n < 0 || n > current->files->max_fdset)
                goto out_nofds;

        /*
         * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
         * since we used fdset we need to allocate memory in units of
         * long-words. 
         */
        ret = -ENOMEM;
        size = FDS_BYTES(n);
        bits = kmalloc(6 * size, GFP_KERNEL);
        if (!bits)
                goto out_nofds;
        fds.in      = (unsigned long *)  bits;
        fds.out     = (unsigned long *) (bits +   size);
        fds.ex      = (unsigned long *) (bits + 2*size);
        fds.res_in  = (unsigned long *) (bits + 3*size);
        fds.res_out = (unsigned long *) (bits + 4*size);
        fds.res_ex  = (unsigned long *) (bits + 5*size);

        if ((ret = get_fd_set(n, inp->fds_bits, fds.in)) ||
            (ret = get_fd_set(n, outp->fds_bits, fds.out)) ||
            (ret = get_fd_set(n, exp->fds_bits, fds.ex)))
                goto out;
        zero_fd_set(n, fds.res_in);
        zero_fd_set(n, fds.res_out);
        zero_fd_set(n, fds.res_ex);

        ret = do_select(n, &fds, &timeout);

        /* OSF does not copy back the remaining time.  */

        if (ret < 0)
                goto out;
        if (!ret) {
                ret = -ERESTARTNOHAND;
                if (signal_pending(current))
                        goto out;
                ret = 0;
        }

        set_fd_set(n, inp->fds_bits, fds.res_in);
        set_fd_set(n, outp->fds_bits, fds.res_out);
        set_fd_set(n, exp->fds_bits, fds.res_ex);

out:
        kfree(bits);
out_nofds:
        return ret;
}

struct rusage32 {
        struct timeval32 ru_utime;      /* user time used */
        struct timeval32 ru_stime;      /* system time used */
        long    ru_maxrss;              /* maximum resident set size */
        long    ru_ixrss;               /* integral shared memory size */
        long    ru_idrss;               /* integral unshared data size */
        long    ru_isrss;               /* integral unshared stack size */
        long    ru_minflt;              /* page reclaims */
        long    ru_majflt;              /* page faults */
        long    ru_nswap;               /* swaps */
        long    ru_inblock;             /* block input operations */
        long    ru_oublock;             /* block output operations */
        long    ru_msgsnd;              /* messages sent */
        long    ru_msgrcv;              /* messages received */
        long    ru_nsignals;            /* signals received */
        long    ru_nvcsw;               /* voluntary context switches */
        long    ru_nivcsw;              /* involuntary " */
};

asmlinkage int osf_getrusage(int who, struct rusage32 *ru)
{
        struct rusage32 r;

        if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
                return -EINVAL;

        memset(&r, 0, sizeof(r));
        switch (who) {
        case RUSAGE_SELF:
                r.ru_utime.tv_sec = CT_TO_SECS(current->times.tms_utime);
                r.ru_utime.tv_usec = CT_TO_USECS(current->times.tms_utime);
                r.ru_stime.tv_sec = CT_TO_SECS(current->times.tms_stime);
                r.ru_stime.tv_usec = CT_TO_USECS(current->times.tms_stime);
                r.ru_minflt = current->min_flt;
                r.ru_majflt = current->maj_flt;
                r.ru_nswap = current->nswap;
                break;
        case RUSAGE_CHILDREN:
                r.ru_utime.tv_sec = CT_TO_SECS(current->times.tms_cutime);
                r.ru_utime.tv_usec = CT_TO_USECS(current->times.tms_cutime);
                r.ru_stime.tv_sec = CT_TO_SECS(current->times.tms_cstime);
                r.ru_stime.tv_usec = CT_TO_USECS(current->times.tms_cstime);
                r.ru_minflt = current->cmin_flt;
                r.ru_majflt = current->cmaj_flt;
                r.ru_nswap = current->cnswap;
                break;
        default:
                r.ru_utime.tv_sec = CT_TO_SECS(current->times.tms_utime +
                                               current->times.tms_cutime);
                r.ru_utime.tv_usec = CT_TO_USECS(current->times.tms_utime +
                                                 current->times.tms_cutime);
                r.ru_stime.tv_sec = CT_TO_SECS(current->times.tms_stime +
                                               current->times.tms_cstime);
                r.ru_stime.tv_usec = CT_TO_USECS(current->times.tms_stime +
                                                 current->times.tms_cstime);
                r.ru_minflt = current->min_flt + current->cmin_flt;
                r.ru_majflt = current->maj_flt + current->cmaj_flt;
                r.ru_nswap = current->nswap + current->cnswap;
                break;
        }

        return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
}

asmlinkage int osf_wait4(pid_t pid, int *ustatus, int options,
                         struct rusage32 *ur)
{
        if (!ur) {
                return sys_wait4(pid, ustatus, options, NULL);
        } else {
                struct rusage r;
                int ret, status;
                mm_segment_t old_fs = get_fs();
                
                set_fs (KERNEL_DS);
                ret = sys_wait4(pid, &status, options, &r);
                set_fs (old_fs);

                if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
                        return -EFAULT;
                __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec);
                __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec);
                __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec);
                __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec);
                __put_user(r.ru_maxrss, &ur->ru_maxrss);
                __put_user(r.ru_ixrss, &ur->ru_ixrss);
                __put_user(r.ru_idrss, &ur->ru_idrss);
                __put_user(r.ru_isrss, &ur->ru_isrss);
                __put_user(r.ru_minflt, &ur->ru_minflt);
                __put_user(r.ru_majflt, &ur->ru_majflt);
                __put_user(r.ru_nswap, &ur->ru_nswap);
                __put_user(r.ru_inblock, &ur->ru_inblock);
                __put_user(r.ru_oublock, &ur->ru_oublock);
                __put_user(r.ru_msgsnd, &ur->ru_msgsnd);
                __put_user(r.ru_msgrcv, &ur->ru_msgrcv);
                __put_user(r.ru_nsignals, &ur->ru_nsignals);
                __put_user(r.ru_nvcsw, &ur->ru_nvcsw);
                if (__put_user(r.ru_nivcsw, &ur->ru_nivcsw))
                        return -EFAULT;

                if (ustatus && put_user(status, ustatus))
                        return -EFAULT;
                return ret;
        }
}

/*
 * I don't know what the parameters are: the first one
 * seems to be a timeval pointer, and I suspect the second
 * one is the time remaining.. Ho humm.. No documentation.
 */
asmlinkage int osf_usleep_thread(struct timeval32 *sleep, struct timeval32 *remain)
{
        struct timeval tmp;
        unsigned long ticks;

        if (get_tv32(&tmp, sleep))
                goto fault;

        ticks = tmp.tv_usec;
        ticks = (ticks + (1000000 / HZ) - 1) / (1000000 / HZ);
        ticks += tmp.tv_sec * HZ;

        current->state = TASK_INTERRUPTIBLE;
        ticks = schedule_timeout(ticks);

        if (remain) {
                tmp.tv_sec = ticks / HZ;
                tmp.tv_usec = ticks % HZ;
                if (put_tv32(remain, &tmp))
                        goto fault;
        }
        
        return 0;
fault:
        return -EFAULT;
}


struct timex32 {
        unsigned int modes;     /* mode selector */
        long offset;            /* time offset (usec) */
        long freq;              /* frequency offset (scaled ppm) */
        long maxerror;          /* maximum error (usec) */
        long esterror;          /* estimated error (usec) */
        int status;             /* clock command/status */
        long constant;          /* pll time constant */
        long precision;         /* clock precision (usec) (read only) */
        long tolerance;         /* clock frequency tolerance (ppm)
                                 * (read only)
                                 */
        struct timeval32 time;  /* (read only) */
        long tick;              /* (modified) usecs between clock ticks */

        long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
        long jitter;            /* pps jitter (us) (ro) */
        int shift;              /* interval duration (s) (shift) (ro) */
        long stabil;            /* pps stability (scaled ppm) (ro) */
        long jitcnt;            /* jitter limit exceeded (ro) */
        long calcnt;            /* calibration intervals (ro) */
        long errcnt;            /* calibration errors (ro) */
        long stbcnt;            /* stability limit exceeded (ro) */

        int  :32; int  :32; int  :32; int  :32;
        int  :32; int  :32; int  :32; int  :32;
        int  :32; int  :32; int  :32; int  :32;
};

asmlinkage int sys_old_adjtimex(struct timex32 *txc_p)
{
        struct timex txc;
        int ret;

        /* copy relevant bits of struct timex. */
        if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
            copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) - 
                           offsetof(struct timex32, time)))
          return -EFAULT;

        ret = do_adjtimex(&txc);        
        if (ret < 0)
          return ret;
        
        /* copy back to timex32 */
        if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) ||
            (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) - 
                          offsetof(struct timex32, tick))) ||
            (put_tv32(&txc_p->time, &txc.time)))
          return -EFAULT;

        return ret;
}

/* Get an address range which is currently unmapped.  Similar to the
   generic version except that we know how to honor ADDR_LIMIT_32BIT.  */

static unsigned long
arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
                         unsigned long limit)
{
        struct vm_area_struct *vma = find_vma(current->mm, addr);

        while (1) {
                /* At this point:  (!vma || addr < vma->vm_end). */
                if (limit - len < addr)
                        return -ENOMEM;
                if (!vma || addr + len <= vma->vm_start)
                        return addr;
                addr = vma->vm_end;
                vma = vma->vm_next;
        }
}

unsigned long
arch_get_unmapped_area(struct file *filp, unsigned long addr,
                       unsigned long len, unsigned long pgoff,
                       unsigned long flags)
{
        unsigned long limit;

        /* "32 bit" actually means 31 bit, since pointers sign extend.  */
        if (current->personality & ADDR_LIMIT_32BIT)
                limit = 0x80000000;
        else
                limit = TASK_SIZE;

        if (len > limit)
                return -ENOMEM;

        /* First, see if the given suggestion fits.

           The OSF/1 loader (/sbin/loader) relies on us returning an
           address larger than the requested if one exists, which is
           a terribly broken way to program.

           That said, I can see the use in being able to suggest not
           merely specific addresses, but regions of memory -- perhaps
           this feature should be incorporated into all ports?  */

        if (addr) {
                addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
                if (addr != -ENOMEM)
                        return addr;
        }

        /* Next, try allocating at TASK_UNMAPPED_BASE.  */
        addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
                                         len, limit);
        if (addr != -ENOMEM)
                return addr;

        /* Finally, try allocating in low memory.  */
        addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit);

        return addr;
}

#ifdef CONFIG_OSF4_COMPAT
extern ssize_t sys_readv(unsigned long, const struct iovec *, unsigned long);
extern ssize_t sys_writev(unsigned long, const struct iovec *, unsigned long);

/* Clear top 32 bits of iov_len in the user's buffer for
   compatibility with old versions of OSF/1 where iov_len
   was defined as int. */
static int
osf_fix_iov_len(const struct iovec *iov, unsigned long count)
{
        unsigned long i;

        for (i = 0 ; i < count ; i++) {
                int *iov_len_high = (int *)&iov[i].iov_len + 1;

                if (put_user(0, iov_len_high))
                        return -EFAULT;
        }
        return 0;
}

asmlinkage ssize_t
osf_readv(unsigned long fd, const struct iovec * vector, unsigned long count)
{
        if (unlikely(personality(current->personality) == PER_OSF4))
                if (osf_fix_iov_len(vector, count))
                        return -EFAULT;
        return sys_readv(fd, vector, count);
}

asmlinkage ssize_t
osf_writev(unsigned long fd, const struct iovec * vector, unsigned long count)
{
        if (unlikely(personality(current->personality) == PER_OSF4))
                if (osf_fix_iov_len(vector, count))
                        return -EFAULT;
        return sys_writev(fd, vector, count);
}

#endif