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author | Ley Foon Tan | 2014-11-06 08:19:57 +0100 |
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committer | Ley Foon Tan | 2014-12-08 05:55:58 +0100 |
commit | 1000197d801329804d30094aef5dba0265204d17 (patch) | |
tree | 9c494ebb84afcfae63306c6d8fdcd56028cb80fc /arch/nios2/kernel/sys_nios2.c | |
parent | nios2: ELF definitions (diff) | |
download | kernel-qcow2-linux-1000197d801329804d30094aef5dba0265204d17.tar.gz kernel-qcow2-linux-1000197d801329804d30094aef5dba0265204d17.tar.xz kernel-qcow2-linux-1000197d801329804d30094aef5dba0265204d17.zip |
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@altera.com>
Diffstat (limited to 'arch/nios2/kernel/sys_nios2.c')
-rw-r--r-- | arch/nios2/kernel/sys_nios2.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/nios2/kernel/sys_nios2.c b/arch/nios2/kernel/sys_nios2.c new file mode 100644 index 000000000000..cd390ec4f88b --- /dev/null +++ b/arch/nios2/kernel/sys_nios2.c @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2013 Altera Corporation + * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.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> + +/* 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; + + /* We only support op 0 now, return error if op is non-zero.*/ + if (op) + return -EINVAL; + + /* 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; + + flush_cache_range(vma, addr, addr + len); + + return 0; +} + +asmlinkage int sys_getpagesize(void) +{ + return PAGE_SIZE; +} |