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Date: Fri, 18 Apr 2014 20:26:59 +0800
From: Ley Foon Tan <lftan@...era.com>
To: <linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-doc@...r.kernel.org>
CC: Ley Foon Tan <lftan@...era.com>, <lftan.linux@...il.com>,
<cltang@...esourcery.com>
Subject: [PATCH 16/28] nios2: System calls handling
This patch adds support for system calls from userspaces. It uses the
asm-generic/unistd.h definitions with architecture spcific syscall. The sys_call_table
is just an array defined in a C file and it contains pointers to the syscall functions.
Signed-off-by: Ley Foon Tan <lftan@...era.com>
---
arch/nios2/include/asm/syscalls.h | 25 +++++++++++++
arch/nios2/include/uapi/asm/unistd.h | 25 +++++++++++++
arch/nios2/kernel/sys_nios2.c | 72 ++++++++++++++++++++++++++++++++++++
arch/nios2/kernel/syscall_table.c | 29 +++++++++++++++
4 files changed, 151 insertions(+)
create mode 100644 arch/nios2/include/asm/syscalls.h
create mode 100644 arch/nios2/include/uapi/asm/unistd.h
create mode 100644 arch/nios2/kernel/sys_nios2.c
create mode 100644 arch/nios2/kernel/syscall_table.c
diff --git a/arch/nios2/include/asm/syscalls.h b/arch/nios2/include/asm/syscalls.h
new file mode 100644
index 0000000..0245d780351b35a11bfe132377c9f5230cbebd8e
--- /dev/null
+++ b/arch/nios2/include/asm/syscalls.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright Altera Corporation (C) 2013. All rights reserved
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#ifndef __ASM_NIOS2_SYSCALLS_H
+#define __ASM_NIOS2_SYSCALLS_H
+
+int sys_cacheflush(unsigned long addr, unsigned long len,
+ unsigned int op);
+
+#include <asm-generic/syscalls.h>
+
+#endif /* __ASM_NIOS2_SYSCALLS_H */
diff --git a/arch/nios2/include/uapi/asm/unistd.h b/arch/nios2/include/uapi/asm/unistd.h
new file mode 100644
index 0000000..c4bf7951046153b3a39f5c11a21dadfe3de0f74a
--- /dev/null
+++ b/arch/nios2/include/uapi/asm/unistd.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2013 Altera Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+ #define sys_mmap2 sys_mmap_pgoff
+
+/* Use the standard ABI for syscalls */
+#include <asm-generic/unistd.h>
+
+/* Additional Nios II specific syscalls. */
+#define __NR_cacheflush (__NR_arch_specific_syscall)
+__SYSCALL(__NR_cacheflush, sys_cacheflush)
diff --git a/arch/nios2/kernel/sys_nios2.c b/arch/nios2/kernel/sys_nios2.c
new file mode 100644
index 0000000..994bf8ad53c4a1c68a658bc936a44812235e46c3
--- /dev/null
+++ b/arch/nios2/kernel/sys_nios2.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2013 Altera Corporation
+ * Copyright (C) 2011-2012 Tobias Klauser <tklauser@...tanz.ch>
+ * Copyright (C) 2004 Microtronix Datacom Ltd.
+ *
+ * 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.
+ */
+
+#include <linux/export.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+
+#include <asm/cacheflush.h>
+#include <asm/traps.h>
+
+asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long offset)
+{
+ if (offset & ~PAGE_MASK)
+ return -EINVAL;
+
+ return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+}
+
+/* sys_cacheflush -- flush the processor cache. */
+asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
+ unsigned int op)
+{
+ struct vm_area_struct *vma;
+
+ if (len == 0)
+ return 0;
+
+ /* Check for overflow */
+ if (addr + len < addr)
+ return -EFAULT;
+
+ /*
+ * Verify that the specified address region actually belongs
+ * to this process.
+ */
+ vma = find_vma(current->mm, addr);
+ if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
+ return -EFAULT;
+
+ /* Ignore the scope and cache arguments. */
+ flush_cache_range(vma, addr, addr + len);
+
+ return 0;
+}
+
+asmlinkage int sys_getpagesize(void)
+{
+ return PAGE_SIZE;
+}
+
+#if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
+#include <linux/fb.h>
+unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags)
+{
+
+ struct fb_info *info = filp->private_data;
+ return info->screen_base;
+}
+EXPORT_SYMBOL(get_fb_unmapped_area);
+#endif /* CONFIG_FB */
diff --git a/arch/nios2/kernel/syscall_table.c b/arch/nios2/kernel/syscall_table.c
new file mode 100644
index 0000000..06e6ac1835b2ed93f420a4ab0d1e06911144486b
--- /dev/null
+++ b/arch/nios2/kernel/syscall_table.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright Altera Corporation (C) 2013. All rights reserved
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/syscalls.h>
+#include <linux/signal.h>
+#include <linux/unistd.h>
+
+#include <asm/syscalls.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+void *sys_call_table[__NR_syscalls] = {
+#include <asm/unistd.h>
+};
--
1.8.3.2
--
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