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-rw-r--r--arch/xtensa/kernel/syscall.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
new file mode 100644
index 000000000..b3c2450d6
--- /dev/null
+++ b/arch/xtensa/kernel/syscall.c
@@ -0,0 +1,99 @@
+/*
+ * arch/xtensa/kernel/syscall.c
+ *
+ * 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) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2000 Silicon Graphics, Inc.
+ * Copyright (C) 1995 - 2000 by Ralf Baechle
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Chris Zankel <chris@zankel.net>
+ * Kevin Chea
+ *
+ */
+#include <linux/uaccess.h>
+#include <asm/syscall.h>
+#include <linux/linkage.h>
+#include <linux/stringify.h>
+#include <linux/errno.h>
+#include <linux/syscalls.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/mman.h>
+#include <linux/sched/mm.h>
+#include <linux/shm.h>
+
+syscall_t sys_call_table[] /* FIXME __cacheline_aligned */= {
+#define __SYSCALL(nr, entry) (syscall_t)entry,
+#include <asm/syscall_table.h>
+};
+
+#define COLOUR_ALIGN(addr, pgoff) \
+ ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \
+ (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
+
+asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
+{
+ unsigned long ret;
+ long err;
+
+ err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
+ if (err)
+ return err;
+ return (long)ret;
+}
+
+asmlinkage long xtensa_fadvise64_64(int fd, int advice,
+ unsigned long long offset, unsigned long long len)
+{
+ return ksys_fadvise64_64(fd, offset, len, advice);
+}
+
+#ifdef CONFIG_MMU
+unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags)
+{
+ struct vm_area_struct *vmm;
+ struct vma_iterator vmi;
+
+ if (flags & MAP_FIXED) {
+ /* We do not accept a shared mapping if it would violate
+ * cache aliasing constraints.
+ */
+ if ((flags & MAP_SHARED) &&
+ ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
+ return -EINVAL;
+ return addr;
+ }
+
+ if (len > TASK_SIZE)
+ return -ENOMEM;
+ if (!addr)
+ addr = TASK_UNMAPPED_BASE;
+
+ if (flags & MAP_SHARED)
+ addr = COLOUR_ALIGN(addr, pgoff);
+ else
+ addr = PAGE_ALIGN(addr);
+
+ vma_iter_init(&vmi, current->mm, addr);
+ for_each_vma(vmi, vmm) {
+ /* At this point: (addr < vmm->vm_end). */
+ if (addr + len <= vm_start_gap(vmm))
+ break;
+
+ addr = vmm->vm_end;
+ if (flags & MAP_SHARED)
+ addr = COLOUR_ALIGN(addr, pgoff);
+ }
+
+ if (TASK_SIZE - len < addr)
+ return -ENOMEM;
+
+ return addr;
+}
+#endif