sys_m68k.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:15k
- /*
- * linux/arch/m68k/kernel/sys_m68k.c
- *
- * This file contains various random system calls that
- * have a non-standard calling sequence on the Linux/m68k
- * platform.
- */
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/sem.h>
- #include <linux/msg.h>
- #include <linux/shm.h>
- #include <linux/stat.h>
- #include <linux/mman.h>
- #include <linux/file.h>
- #include <linux/utsname.h>
- #include <asm/setup.h>
- #include <asm/uaccess.h>
- #include <asm/cachectl.h>
- #include <asm/traps.h>
- #include <asm/ipc.h>
- #include <asm/page.h>
- /*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way unix traditionally does this, though.
- */
- asmlinkage int sys_pipe(unsigned long * fildes)
- {
- int fd[2];
- int error;
- error = do_pipe(fd);
- if (!error) {
- if (copy_to_user(fildes, fd, 2*sizeof(int)))
- error = -EFAULT;
- }
- return error;
- }
- /* common code for old and new mmaps */
- static inline long do_mmap2(
- unsigned long addr, unsigned long len,
- unsigned long prot, unsigned long flags,
- unsigned long fd, unsigned long pgoff)
- {
- int error = -EBADF;
- struct file * file = NULL;
- flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- if (!(flags & MAP_ANONYMOUS)) {
- file = fget(fd);
- if (!file)
- goto out;
- }
- down_write(¤t->mm->mmap_sem);
- error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
- up_write(¤t->mm->mmap_sem);
- if (file)
- fput(file);
- out:
- return error;
- }
- asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
- unsigned long prot, unsigned long flags,
- unsigned long fd, unsigned long pgoff)
- {
- return do_mmap2(addr, len, prot, flags, fd, pgoff);
- }
- /*
- * Perform the select(nd, in, out, ex, tv) and mmap() system
- * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
- * handle more than 4 system call parameters, so these system calls
- * used a memory block for parameter passing..
- */
- struct mmap_arg_struct {
- unsigned long addr;
- unsigned long len;
- unsigned long prot;
- unsigned long flags;
- unsigned long fd;
- unsigned long offset;
- };
- asmlinkage int old_mmap(struct mmap_arg_struct *arg)
- {
- struct mmap_arg_struct a;
- int error = -EFAULT;
- if (copy_from_user(&a, arg, sizeof(a)))
- goto out;
- error = -EINVAL;
- if (a.offset & ~PAGE_MASK)
- goto out;
- a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
- out:
- return error;
- }
- #if 0
- struct mmap_arg_struct64 {
- __u32 addr;
- __u32 len;
- __u32 prot;
- __u32 flags;
- __u64 offset; /* 64 bits */
- __u32 fd;
- };
- asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
- {
- int error = -EFAULT;
- struct file * file = NULL;
- struct mmap_arg_struct64 a;
- unsigned long pgoff;
- if (copy_from_user(&a, arg, sizeof(a)))
- return -EFAULT;
- if ((long)a.offset & ~PAGE_MASK)
- return -EINVAL;
- pgoff = a.offset >> PAGE_SHIFT;
- if ((a.offset >> PAGE_SHIFT) != pgoff)
- return -EINVAL;
- if (!(a.flags & MAP_ANONYMOUS)) {
- error = -EBADF;
- file = fget(a.fd);
- if (!file)
- goto out;
- }
- a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- down_write(¤t->mm->mmap_sem);
- error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
- up_write(¤t->mm->mmap_sem);
- if (file)
- fput(file);
- out:
- return error;
- }
- #endif
- extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
- struct sel_arg_struct {
- unsigned long n;
- fd_set *inp, *outp, *exp;
- struct timeval *tvp;
- };
- asmlinkage int old_select(struct sel_arg_struct *arg)
- {
- struct sel_arg_struct a;
- if (copy_from_user(&a, arg, sizeof(a)))
- return -EFAULT;
- /* sys_select() does the appropriate kernel locking */
- return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
- }
- /*
- * sys_ipc() is the de-multiplexer for the SysV IPC calls..
- *
- * This is really horribly ugly.
- */
- asmlinkage int sys_ipc (uint call, int first, int second,
- int third, void *ptr, long fifth)
- {
- int version, ret;
- version = call >> 16; /* hack for backward compatibility */
- call &= 0xffff;
- if (call <= SEMCTL)
- switch (call) {
- case SEMOP:
- return sys_semop (first, (struct sembuf *)ptr, second);
- case SEMGET:
- return sys_semget (first, second, third);
- case SEMCTL: {
- union semun fourth;
- if (!ptr)
- return -EINVAL;
- if (get_user(fourth.__pad, (void **) ptr))
- return -EFAULT;
- return sys_semctl (first, second, third, fourth);
- }
- default:
- return -EINVAL;
- }
- if (call <= MSGCTL)
- switch (call) {
- case MSGSND:
- return sys_msgsnd (first, (struct msgbuf *) ptr,
- second, third);
- case MSGRCV:
- switch (version) {
- case 0: {
- struct ipc_kludge tmp;
- if (!ptr)
- return -EINVAL;
- if (copy_from_user (&tmp,
- (struct ipc_kludge *)ptr,
- sizeof (tmp)))
- return -EFAULT;
- return sys_msgrcv (first, tmp.msgp, second,
- tmp.msgtyp, third);
- }
- default:
- return sys_msgrcv (first,
- (struct msgbuf *) ptr,
- second, fifth, third);
- }
- case MSGGET:
- return sys_msgget ((key_t) first, second);
- case MSGCTL:
- return sys_msgctl (first, second,
- (struct msqid_ds *) ptr);
- default:
- return -EINVAL;
- }
- if (call <= SHMCTL)
- switch (call) {
- case SHMAT:
- switch (version) {
- default: {
- ulong raddr;
- ret = sys_shmat (first, (char *) ptr,
- second, &raddr);
- if (ret)
- return ret;
- return put_user (raddr, (ulong *) third);
- }
- }
- case SHMDT:
- return sys_shmdt ((char *)ptr);
- case SHMGET:
- return sys_shmget (first, second, third);
- case SHMCTL:
- return sys_shmctl (first, second,
- (struct shmid_ds *) ptr);
- default:
- return -EINVAL;
- }
- return -EINVAL;
- }
- asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
- {
- return -ENOSYS;
- }
- /* Convert virtual (user) address VADDR to physical address PADDR */
- #define virt_to_phys_040(vaddr)
- ({
- unsigned long _mmusr, _paddr;
-
- __asm__ __volatile__ (".chip 68040nt"
- "ptestr (%1)nt"
- "movec %%mmusr,%0nt"
- ".chip 68k"
- : "=r" (_mmusr)
- : "a" (vaddr));
- _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0;
- _paddr;
- })
- static inline int
- cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
- {
- unsigned long paddr, i;
- switch (scope)
- {
- case FLUSH_SCOPE_ALL:
- switch (cache)
- {
- case FLUSH_CACHE_DATA:
- /* This nop is needed for some broken versions of the 68040. */
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpusha %dcnt"
- ".chip 68k");
- break;
- case FLUSH_CACHE_INSN:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpusha %icnt"
- ".chip 68k");
- break;
- default:
- case FLUSH_CACHE_BOTH:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpusha %bcnt"
- ".chip 68k");
- break;
- }
- break;
- case FLUSH_SCOPE_LINE:
- /* Find the physical address of the first mapped page in the
- address range. */
- if ((paddr = virt_to_phys_040(addr))) {
- paddr += addr & ~(PAGE_MASK | 15);
- len = (len + (addr & 15) + 15) >> 4;
- } else {
- unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
- if (len <= tmp)
- return 0;
- addr += tmp;
- len -= tmp;
- tmp = PAGE_SIZE;
- for (;;)
- {
- if ((paddr = virt_to_phys_040(addr)))
- break;
- if (len <= tmp)
- return 0;
- addr += tmp;
- len -= tmp;
- }
- len = (len + 15) >> 4;
- }
- i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
- while (len--)
- {
- switch (cache)
- {
- case FLUSH_CACHE_DATA:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpushl %%dc,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- case FLUSH_CACHE_INSN:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpushl %%ic,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- default:
- case FLUSH_CACHE_BOTH:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpushl %%bc,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- }
- if (!--i && len)
- {
- /*
- * No need to page align here since it is done by
- * virt_to_phys_040().
- */
- addr += PAGE_SIZE;
- i = PAGE_SIZE / 16;
- /* Recompute physical address when crossing a page
- boundary. */
- for (;;)
- {
- if ((paddr = virt_to_phys_040(addr)))
- break;
- if (len <= i)
- return 0;
- len -= i;
- addr += PAGE_SIZE;
- }
- }
- else
- paddr += 16;
- }
- break;
- default:
- case FLUSH_SCOPE_PAGE:
- len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
- for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
- {
- if (!(paddr = virt_to_phys_040(addr)))
- continue;
- switch (cache)
- {
- case FLUSH_CACHE_DATA:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpushp %%dc,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- case FLUSH_CACHE_INSN:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpushp %%ic,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- default:
- case FLUSH_CACHE_BOTH:
- __asm__ __volatile__ ("nopnt"
- ".chip 68040nt"
- "cpushp %%bc,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- }
- }
- break;
- }
- return 0;
- }
- #define virt_to_phys_060(vaddr)
- ({
- unsigned long paddr;
- __asm__ __volatile__ (".chip 68060nt"
- "plpar (%0)nt"
- ".chip 68k"
- : "=a" (paddr)
- : "0" (vaddr));
- (paddr); /* XXX */
- })
- static inline int
- cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
- {
- unsigned long paddr, i;
- /*
- * 68060 manual says:
- * cpush %dc : flush DC, remains valid (with our %cacr setup)
- * cpush %ic : invalidate IC
- * cpush %bc : flush DC + invalidate IC
- */
- switch (scope)
- {
- case FLUSH_SCOPE_ALL:
- switch (cache)
- {
- case FLUSH_CACHE_DATA:
- __asm__ __volatile__ (".chip 68060nt"
- "cpusha %dcnt"
- ".chip 68k");
- break;
- case FLUSH_CACHE_INSN:
- __asm__ __volatile__ (".chip 68060nt"
- "cpusha %icnt"
- ".chip 68k");
- break;
- default:
- case FLUSH_CACHE_BOTH:
- __asm__ __volatile__ (".chip 68060nt"
- "cpusha %bcnt"
- ".chip 68k");
- break;
- }
- break;
- case FLUSH_SCOPE_LINE:
- /* Find the physical address of the first mapped page in the
- address range. */
- len += addr & 15;
- addr &= -16;
- if (!(paddr = virt_to_phys_060(addr))) {
- unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
- if (len <= tmp)
- return 0;
- addr += tmp;
- len -= tmp;
- tmp = PAGE_SIZE;
- for (;;)
- {
- if ((paddr = virt_to_phys_060(addr)))
- break;
- if (len <= tmp)
- return 0;
- addr += tmp;
- len -= tmp;
- }
- }
- len = (len + 15) >> 4;
- i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
- while (len--)
- {
- switch (cache)
- {
- case FLUSH_CACHE_DATA:
- __asm__ __volatile__ (".chip 68060nt"
- "cpushl %%dc,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- case FLUSH_CACHE_INSN:
- __asm__ __volatile__ (".chip 68060nt"
- "cpushl %%ic,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- default:
- case FLUSH_CACHE_BOTH:
- __asm__ __volatile__ (".chip 68060nt"
- "cpushl %%bc,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- }
- if (!--i && len)
- {
- /*
- * We just want to jump to the first cache line
- * in the next page.
- */
- addr += PAGE_SIZE;
- addr &= PAGE_MASK;
- i = PAGE_SIZE / 16;
- /* Recompute physical address when crossing a page
- boundary. */
- for (;;)
- {
- if ((paddr = virt_to_phys_060(addr)))
- break;
- if (len <= i)
- return 0;
- len -= i;
- addr += PAGE_SIZE;
- }
- }
- else
- paddr += 16;
- }
- break;
- default:
- case FLUSH_SCOPE_PAGE:
- len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
- addr &= PAGE_MASK; /* Workaround for bug in some
- revisions of the 68060 */
- for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
- {
- if (!(paddr = virt_to_phys_060(addr)))
- continue;
- switch (cache)
- {
- case FLUSH_CACHE_DATA:
- __asm__ __volatile__ (".chip 68060nt"
- "cpushp %%dc,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- case FLUSH_CACHE_INSN:
- __asm__ __volatile__ (".chip 68060nt"
- "cpushp %%ic,(%0)nt"
- ".chip 68k"
- : : "a" (paddr));
- break;
- default:
- case FLUSH_CACHE_BOTH:
- __asm__ __volatile__ (".chip 68060nt"
- "cpushp %%bc,(%0)nt"
- ".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, %%caarnt"
- "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;
- }
- /*
- * Old cruft
- */
- asmlinkage int sys_pause(void)
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- return -ERESTARTNOHAND;
- }