Import of Linux/MIPS 2.1.14

1 files changed, 113 insertions, 0 deletions

diff --git a/arch/mips/kernel/sysmips.c b/arch/mips/kernel/sysmips.c
new file mode 100644
index 000000000..d15aaa4dd
--- /dev/null
+++ b/arch/mips/kernel/sysmips.c
@@ -0,0 +1,113 @@
+/*
+ * MIPS specific syscalls
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995 by Ralf Baechle
+ */
+#include <linux/errno.h>
+#include <linux/linkage.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/utsname.h>
+
+#include <asm/cachectl.h>
+#include <asm/cache.h>
+#include <asm/ipc.h>
+#include <asm/uaccess.h>
+#include <asm/sysmips.h>
+
+static inline size_t
+strnlen_user(const char *s, size_t count)
+{
+	return strnlen(s, count);
+}
+
+asmlinkage int
+sys_sysmips(int cmd, int arg1, int arg2, int arg3)
+{
+	int	*p;
+	char	*name;
+	int	flags, tmp, len, retval;
+
+	switch(cmd)
+	{
+	case SETNAME:
+		if (!suser())
+			return -EPERM;
+		name = (char *) arg1;
+		len = strnlen_user(name, retval);
+		if (len < 0)
+			retval = len;
+			break;
+		if (len == 0 || len > __NEW_UTS_LEN)
+			retval = -EINVAL;
+			break;
+		copy_from_user(system_utsname.nodename, name, len);
+		system_utsname.nodename[len] = '\0';
+		return 0;
+
+	case MIPS_ATOMIC_SET:
+		/* This is broken in case of page faults and SMP ...
+		   Risc/OS fauls after maximum 20 tries with EAGAIN.  */
+		p = (int *) arg1;
+		retval = verify_area(VERIFY_WRITE, p, sizeof(*p));
+		if (retval)
+			return retval;
+		save_flags(flags);
+		cli();
+		retval = *p;
+		*p = arg2;
+		restore_flags(flags);
+		break;
+
+	case MIPS_FIXADE:
+		tmp = current->tss.mflags & ~3;
+		current->tss.mflags = tmp | (arg1 & 3);
+		retval = 0;
+		break;
+
+	case FLUSH_CACHE:
+		cacheflush(0, ~0, CF_BCACHE|CF_ALL);
+		break;
+
+	case MIPS_RDNVRAM:
+		retval = -EIO;
+		break;
+
+	default:
+		retval = -EINVAL;
+		break;
+	}
+
+	return retval;
+}
+
+asmlinkage int
+sys_cacheflush(void *addr, int nbytes, int cache)
+{
+	unsigned int rw;
+	int ok;
+
+	if ((cache & ~(DCACHE | ICACHE)) != 0)
+		return -EINVAL;
+	rw = (cache & DCACHE) ? VERIFY_WRITE : VERIFY_READ;
+	if (!access_ok(rw, addr, nbytes))
+		return -EFAULT;
+
+	cacheflush((unsigned long)addr, (unsigned long)nbytes, cache|CF_ALL);
+
+	return 0;
+}
+
+/*
+ * No implemented yet ...
+ */
+asmlinkage int
+sys_cachectl(char *addr, int nbytes, int op)
+{
+	return -ENOSYS;
+}