682 lines
15 KiB
C
682 lines
15 KiB
C
/*
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* linux/arch/m68k/kernel/sys_m68k.c
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/m68k
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* platform.
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*/
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/cachectl.h>
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#include <asm/traps.h>
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#include <asm/ipc.h>
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#include <asm/page.h>
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#include <asm/unistd.h>
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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asmlinkage int sys_pipe(unsigned long __user * fildes)
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{
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int fd[2];
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int error;
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error = do_pipe(fd);
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if (!error) {
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if (copy_to_user(fildes, fd, 2*sizeof(int)))
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error = -EFAULT;
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}
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return error;
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}
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/* common code for old and new mmaps */
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static inline long do_mmap2(
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unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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int error = -EBADF;
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struct file * file = NULL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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return do_mmap2(addr, len, prot, flags, fd, pgoff);
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}
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/*
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* Perform the select(nd, in, out, ex, tv) and mmap() system
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* calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
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* handle more than 4 system call parameters, so these system calls
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* used a memory block for parameter passing..
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*/
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struct mmap_arg_struct {
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unsigned long addr;
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unsigned long len;
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unsigned long prot;
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unsigned long flags;
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unsigned long fd;
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unsigned long offset;
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};
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asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
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{
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struct mmap_arg_struct a;
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int error = -EFAULT;
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if (copy_from_user(&a, arg, sizeof(a)))
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goto out;
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error = -EINVAL;
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if (a.offset & ~PAGE_MASK)
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goto out;
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a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
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out:
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return error;
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}
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#if 0
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struct mmap_arg_struct64 {
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__u32 addr;
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__u32 len;
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__u32 prot;
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__u32 flags;
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__u64 offset; /* 64 bits */
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__u32 fd;
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};
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asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
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{
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int error = -EFAULT;
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struct file * file = NULL;
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struct mmap_arg_struct64 a;
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unsigned long pgoff;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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if ((long)a.offset & ~PAGE_MASK)
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return -EINVAL;
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pgoff = a.offset >> PAGE_SHIFT;
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if ((a.offset >> PAGE_SHIFT) != pgoff)
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return -EINVAL;
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if (!(a.flags & MAP_ANONYMOUS)) {
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error = -EBADF;
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file = fget(a.fd);
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if (!file)
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goto out;
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}
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a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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#endif
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struct sel_arg_struct {
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unsigned long n;
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fd_set __user *inp, *outp, *exp;
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struct timeval __user *tvp;
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};
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asmlinkage int old_select(struct sel_arg_struct __user *arg)
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{
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struct sel_arg_struct a;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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/* sys_select() does the appropriate kernel locking */
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return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
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}
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly.
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*/
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asmlinkage int sys_ipc (uint call, int first, int second,
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int third, void __user *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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if (call <= SEMCTL)
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switch (call) {
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case SEMOP:
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return sys_semop (first, ptr, second);
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case SEMGET:
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return sys_semget (first, second, third);
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case SEMCTL: {
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union semun fourth;
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if (!ptr)
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return -EINVAL;
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if (get_user(fourth.__pad, (void __user *__user *) ptr))
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return -EFAULT;
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return sys_semctl (first, second, third, fourth);
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}
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default:
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return -ENOSYS;
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}
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if (call <= MSGCTL)
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switch (call) {
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case MSGSND:
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return sys_msgsnd (first, ptr, second, third);
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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if (!ptr)
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return -EINVAL;
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if (copy_from_user (&tmp, ptr, sizeof (tmp)))
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return -EFAULT;
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return sys_msgrcv (first, tmp.msgp, second,
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tmp.msgtyp, third);
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}
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default:
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return sys_msgrcv (first, ptr,
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second, fifth, third);
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}
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case MSGGET:
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return sys_msgget ((key_t) first, second);
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case MSGCTL:
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return sys_msgctl (first, second, ptr);
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default:
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return -ENOSYS;
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}
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if (call <= SHMCTL)
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switch (call) {
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case SHMAT:
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switch (version) {
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default: {
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ulong raddr;
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ret = do_shmat (first, ptr, second, &raddr);
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if (ret)
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return ret;
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return put_user (raddr, (ulong __user *) third);
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}
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}
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case SHMDT:
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return sys_shmdt (ptr);
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case SHMGET:
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return sys_shmget (first, second, third);
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case SHMCTL:
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return sys_shmctl (first, second, ptr);
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default:
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return -ENOSYS;
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}
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return -EINVAL;
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}
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/* Convert virtual (user) address VADDR to physical address PADDR */
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#define virt_to_phys_040(vaddr) \
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({ \
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unsigned long _mmusr, _paddr; \
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\
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__asm__ __volatile__ (".chip 68040\n\t" \
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"ptestr (%1)\n\t" \
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"movec %%mmusr,%0\n\t" \
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".chip 68k" \
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: "=r" (_mmusr) \
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: "a" (vaddr)); \
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_paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0; \
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_paddr; \
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})
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static inline int
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cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
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{
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unsigned long paddr, i;
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switch (scope)
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{
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case FLUSH_SCOPE_ALL:
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switch (cache)
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{
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case FLUSH_CACHE_DATA:
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/* This nop is needed for some broken versions of the 68040. */
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpusha %dc\n\t"
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".chip 68k");
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break;
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case FLUSH_CACHE_INSN:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpusha %ic\n\t"
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".chip 68k");
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break;
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default:
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case FLUSH_CACHE_BOTH:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpusha %bc\n\t"
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".chip 68k");
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break;
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}
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break;
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case FLUSH_SCOPE_LINE:
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/* Find the physical address of the first mapped page in the
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address range. */
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if ((paddr = virt_to_phys_040(addr))) {
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paddr += addr & ~(PAGE_MASK | 15);
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len = (len + (addr & 15) + 15) >> 4;
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} else {
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unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
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if (len <= tmp)
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return 0;
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addr += tmp;
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len -= tmp;
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tmp = PAGE_SIZE;
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for (;;)
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{
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if ((paddr = virt_to_phys_040(addr)))
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break;
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if (len <= tmp)
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return 0;
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addr += tmp;
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len -= tmp;
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}
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len = (len + 15) >> 4;
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}
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i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
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while (len--)
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{
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switch (cache)
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{
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case FLUSH_CACHE_DATA:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpushl %%dc,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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case FLUSH_CACHE_INSN:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpushl %%ic,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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default:
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case FLUSH_CACHE_BOTH:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpushl %%bc,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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}
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if (!--i && len)
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{
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/*
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* No need to page align here since it is done by
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* virt_to_phys_040().
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*/
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addr += PAGE_SIZE;
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i = PAGE_SIZE / 16;
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/* Recompute physical address when crossing a page
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boundary. */
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for (;;)
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{
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if ((paddr = virt_to_phys_040(addr)))
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break;
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if (len <= i)
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return 0;
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len -= i;
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addr += PAGE_SIZE;
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}
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}
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else
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paddr += 16;
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}
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break;
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default:
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case FLUSH_SCOPE_PAGE:
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len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
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for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
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{
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if (!(paddr = virt_to_phys_040(addr)))
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continue;
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switch (cache)
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{
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case FLUSH_CACHE_DATA:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpushp %%dc,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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case FLUSH_CACHE_INSN:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpushp %%ic,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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default:
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case FLUSH_CACHE_BOTH:
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__asm__ __volatile__ ("nop\n\t"
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".chip 68040\n\t"
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"cpushp %%bc,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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}
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}
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break;
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}
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return 0;
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}
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#define virt_to_phys_060(vaddr) \
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({ \
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unsigned long paddr; \
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__asm__ __volatile__ (".chip 68060\n\t" \
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"plpar (%0)\n\t" \
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".chip 68k" \
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: "=a" (paddr) \
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: "0" (vaddr)); \
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(paddr); /* XXX */ \
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})
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static inline int
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cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
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{
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unsigned long paddr, i;
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/*
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* 68060 manual says:
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* cpush %dc : flush DC, remains valid (with our %cacr setup)
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* cpush %ic : invalidate IC
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* cpush %bc : flush DC + invalidate IC
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*/
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switch (scope)
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{
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case FLUSH_SCOPE_ALL:
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switch (cache)
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{
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case FLUSH_CACHE_DATA:
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpusha %dc\n\t"
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".chip 68k");
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break;
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case FLUSH_CACHE_INSN:
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpusha %ic\n\t"
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".chip 68k");
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break;
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default:
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case FLUSH_CACHE_BOTH:
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpusha %bc\n\t"
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".chip 68k");
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break;
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}
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break;
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case FLUSH_SCOPE_LINE:
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/* Find the physical address of the first mapped page in the
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address range. */
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len += addr & 15;
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addr &= -16;
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if (!(paddr = virt_to_phys_060(addr))) {
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unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
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if (len <= tmp)
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return 0;
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addr += tmp;
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len -= tmp;
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tmp = PAGE_SIZE;
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for (;;)
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{
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if ((paddr = virt_to_phys_060(addr)))
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break;
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if (len <= tmp)
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return 0;
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addr += tmp;
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len -= tmp;
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}
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}
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len = (len + 15) >> 4;
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i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
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while (len--)
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{
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switch (cache)
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{
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case FLUSH_CACHE_DATA:
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpushl %%dc,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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case FLUSH_CACHE_INSN:
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpushl %%ic,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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default:
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case FLUSH_CACHE_BOTH:
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpushl %%bc,(%0)\n\t"
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".chip 68k"
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: : "a" (paddr));
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break;
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}
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if (!--i && len)
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{
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/*
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* We just want to jump to the first cache line
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* in the next page.
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*/
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addr += PAGE_SIZE;
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addr &= PAGE_MASK;
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i = PAGE_SIZE / 16;
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/* Recompute physical address when crossing a page
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boundary. */
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for (;;)
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{
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if ((paddr = virt_to_phys_060(addr)))
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break;
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if (len <= i)
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return 0;
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len -= i;
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addr += PAGE_SIZE;
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}
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}
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else
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paddr += 16;
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}
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break;
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default:
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case FLUSH_SCOPE_PAGE:
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len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
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addr &= PAGE_MASK; /* Workaround for bug in some
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revisions of the 68060 */
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for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
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{
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if (!(paddr = virt_to_phys_060(addr)))
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continue;
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switch (cache)
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{
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case FLUSH_CACHE_DATA:
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__asm__ __volatile__ (".chip 68060\n\t"
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"cpushp %%dc,(%0)\n\t"
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".chip 68k"
|
|
: : "a" (paddr));
|
|
break;
|
|
case FLUSH_CACHE_INSN:
|
|
__asm__ __volatile__ (".chip 68060\n\t"
|
|
"cpushp %%ic,(%0)\n\t"
|
|
".chip 68k"
|
|
: : "a" (paddr));
|
|
break;
|
|
default:
|
|
case FLUSH_CACHE_BOTH:
|
|
__asm__ __volatile__ (".chip 68060\n\t"
|
|
"cpushp %%bc,(%0)\n\t"
|
|
".chip 68k"
|
|
: : "a" (paddr));
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* sys_cacheflush -- flush (part of) the processor cache. */
|
|
asmlinkage int
|
|
sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
|
|
{
|
|
struct vm_area_struct *vma;
|
|
int ret = -EINVAL;
|
|
|
|
lock_kernel();
|
|
if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
|
|
cache & ~FLUSH_CACHE_BOTH)
|
|
goto out;
|
|
|
|
if (scope == FLUSH_SCOPE_ALL) {
|
|
/* Only the superuser may explicitly flush the whole cache. */
|
|
ret = -EPERM;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
goto out;
|
|
} else {
|
|
/*
|
|
* Verify that the specified address region actually belongs
|
|
* to this process.
|
|
*/
|
|
vma = find_vma (current->mm, addr);
|
|
ret = -EINVAL;
|
|
/* Check for overflow. */
|
|
if (addr + len < addr)
|
|
goto out;
|
|
if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
|
|
goto out;
|
|
}
|
|
|
|
if (CPU_IS_020_OR_030) {
|
|
if (scope == FLUSH_SCOPE_LINE && len < 256) {
|
|
unsigned long cacr;
|
|
__asm__ ("movec %%cacr, %0" : "=r" (cacr));
|
|
if (cache & FLUSH_CACHE_INSN)
|
|
cacr |= 4;
|
|
if (cache & FLUSH_CACHE_DATA)
|
|
cacr |= 0x400;
|
|
len >>= 2;
|
|
while (len--) {
|
|
__asm__ __volatile__ ("movec %1, %%caar\n\t"
|
|
"movec %0, %%cacr"
|
|
: /* no outputs */
|
|
: "r" (cacr), "r" (addr));
|
|
addr += 4;
|
|
}
|
|
} else {
|
|
/* Flush the whole cache, even if page granularity requested. */
|
|
unsigned long cacr;
|
|
__asm__ ("movec %%cacr, %0" : "=r" (cacr));
|
|
if (cache & FLUSH_CACHE_INSN)
|
|
cacr |= 8;
|
|
if (cache & FLUSH_CACHE_DATA)
|
|
cacr |= 0x800;
|
|
__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
|
|
}
|
|
ret = 0;
|
|
goto out;
|
|
} else {
|
|
/*
|
|
* 040 or 060: don't blindly trust 'scope', someone could
|
|
* try to flush a few megs of memory.
|
|
*/
|
|
|
|
if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
|
|
scope=FLUSH_SCOPE_PAGE;
|
|
if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
|
|
scope=FLUSH_SCOPE_ALL;
|
|
if (CPU_IS_040) {
|
|
ret = cache_flush_040 (addr, scope, cache, len);
|
|
} else if (CPU_IS_060) {
|
|
ret = cache_flush_060 (addr, scope, cache, len);
|
|
}
|
|
}
|
|
out:
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage int sys_getpagesize(void)
|
|
{
|
|
return PAGE_SIZE;
|
|
}
|
|
|
|
/*
|
|
* Do a system call from kernel instead of calling sys_execve so we
|
|
* end up with proper pt_regs.
|
|
*/
|
|
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
|
|
{
|
|
register long __res asm ("%d0") = __NR_execve;
|
|
register long __a asm ("%d1") = (long)(filename);
|
|
register long __b asm ("%d2") = (long)(argv);
|
|
register long __c asm ("%d3") = (long)(envp);
|
|
asm volatile ("trap #0" : "+d" (__res)
|
|
: "d" (__a), "d" (__b), "d" (__c));
|
|
return __res;
|
|
}
|