Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * Copyright (C) 2013 Altera Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (C) 2004 Microtronix Datacom Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /* sys_cacheflush -- flush the processor cache. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 				unsigned int op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	struct mm_struct *mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	if (len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	/* We only support op 0 now, return error if op is non-zero.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	if (op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	/* Check for overflow */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if (addr + len < addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	if (mmap_read_lock_killable(mm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	 * Verify that the specified address region actually belongs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	 * to this process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	vma = find_vma(mm, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	flush_cache_range(vma, addr, addr + len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) asmlinkage int sys_getpagesize(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	return PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }