1 files changed, 122 insertions, 0 deletions

diff --git a/arch/tile/kernel/sys.c b/arch/tile/kernel/sys.c
new file mode 100644
index 000000000000..a3d982b212b4
--- /dev/null
+++ b/arch/tile/kernel/sys.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/TILE
+ * platform.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/syscalls.h>
+#include <linux/mman.h>
+#include <linux/file.h>
+#include <linux/mempolicy.h>
+#include <linux/binfmts.h>
+#include <linux/fs.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <linux/signal.h>
+#include <asm/syscalls.h>
+
+#include <asm/pgtable.h>
+#include <asm/homecache.h>
+#include <arch/chip.h>
+
+SYSCALL_DEFINE0(flush_cache)
+{
+        homecache_evict(cpumask_of(smp_processor_id()));
+        return 0;
+}
+
+/*
+ * Syscalls that pass 64-bit values on 32-bit systems normally
+ * pass them as (low,high) word packed into the immediately adjacent
+ * registers.  If the low word naturally falls on an even register,
+ * our ABI makes it work correctly; if not, we adjust it here.
+ * Handling it here means we don't have to fix uclibc AND glibc AND
+ * any other standard libcs we want to support.
+ */
+
+#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
+
+ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
+{
+        return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
+}
+
+long sys32_fadvise64(int fd, u32 offset_lo, u32 offset_hi,
+                     u32 len, int advice)
+{
+        return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
+                                len, advice);
+}
+
+int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
+                       u32 len_lo, u32 len_hi, int advice)
+{
+        return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
+                                ((loff_t)len_hi << 32) | len_lo, advice);
+}
+
+#endif /* 32-bit syscall wrappers */
+
+/*
+ * This API uses a 4KB-page-count offset into the file descriptor.
+ * It is likely not the right API to use on a 64-bit platform.
+ */
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
+                unsigned long, prot, unsigned long, flags,
+                unsigned long, fd, unsigned long, off_4k)
+{
+#define PAGE_ADJUST (PAGE_SHIFT - 12)
+        if (off_4k & ((1 << PAGE_ADJUST) - 1))
+                return -EINVAL;
+        return sys_mmap_pgoff(addr, len, prot, flags, fd,
+                              off_4k >> PAGE_ADJUST);
+}
+
+/*
+ * This API uses a byte offset into the file descriptor.
+ * It is likely not the right API to use on a 32-bit platform.
+ */
+SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
+                unsigned long, prot, unsigned long, flags,
+                unsigned long, fd, unsigned long, offset)
+{
+        if (offset & ((1 << PAGE_SHIFT) - 1))
+                return -EINVAL;
+        return sys_mmap_pgoff(addr, len, prot, flags, fd,
+                              offset >> PAGE_SHIFT);
+}
+
+
+/* Provide the actual syscall number to call mapping. */
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+#ifndef __tilegx__
+/* See comments at the top of the file. */
+#define sys_fadvise64 sys32_fadvise64
+#define sys_fadvise64_64 sys32_fadvise64_64
+#define sys_readahead sys32_readahead
+#define sys_sync_file_range sys_sync_file_range2
+#endif
+
+void *sys_call_table[__NR_syscalls] = {
+        [0 ... __NR_syscalls-1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};