Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * mp.c:  OpenBoot Prom Multiprocessor support routines.  Don't call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *        these on a UP or else you will halt and catch fire. ;)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/openprom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/oplib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) extern void restore_current(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /* Start cpu with prom-tree node 'cpunode' using context described
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * by 'ctable_reg' in context 'ctx' at program counter 'pc'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * XXX Have to look into what the return values mean. XXX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	spin_lock_irqsave(&prom_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	switch(prom_vers) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	case PROM_V0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	case PROM_V2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	case PROM_V3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	restore_current();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	spin_unlock_irqrestore(&prom_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }