mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
1000197d80
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>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
|
|
* 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;
|
|
}
|