Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 2009 Wind River Systems,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *   written by Ralf Baechle <ralf@linux-mips.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/irqflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/prefetch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/cop2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/current.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/mipsregs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/octeon/octeon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	unsigned int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	switch (action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	case CU2_EXCEPTION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		prefetch(&current->thread.cp2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		KSTK_STATUS(current) |= ST0_CU2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		status = read_c0_status();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		write_c0_status(status | ST0_CU2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		octeon_cop2_restore(&(current->thread.cp2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		write_c0_status(status & ~ST0_CU2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		return NOTIFY_BAD;	/* Don't call default notifier */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	return NOTIFY_OK;		/* Let default notifier send signals */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static int __init cnmips_cu2_setup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	return cu2_notifier(cnmips_cu2_call, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) early_initcall(cnmips_cu2_setup);