1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * KVM/MIPS: Interrupt delivery
7  *
8  * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
9  * Authors: Sanjay Lal <sanjayl@kymasys.com>
10  */
11 
12 #include <linux/errno.h>
13 #include <linux/err.h>
14 #include <linux/vmalloc.h>
15 #include <linux/fs.h>
16 #include <linux/memblock.h>
17 #include <asm/page.h>
18 #include <asm/cacheflush.h>
19 
20 #include <linux/kvm_host.h>
21 
22 #include "interrupt.h"
23 
kvm_mips_deliver_interrupts(struct kvm_vcpu * vcpu,u32 cause)24 void kvm_mips_deliver_interrupts(struct kvm_vcpu *vcpu, u32 cause)
25 {
26 	unsigned long *pending = &vcpu->arch.pending_exceptions;
27 	unsigned long *pending_clr = &vcpu->arch.pending_exceptions_clr;
28 	unsigned int priority;
29 
30 	if (!(*pending) && !(*pending_clr))
31 		return;
32 
33 	priority = __ffs(*pending_clr);
34 	while (priority <= MIPS_EXC_MAX) {
35 		kvm_mips_callbacks->irq_clear(vcpu, priority, cause);
36 
37 		priority = find_next_bit(pending_clr,
38 					 BITS_PER_BYTE * sizeof(*pending_clr),
39 					 priority + 1);
40 	}
41 
42 	priority = __ffs(*pending);
43 	while (priority <= MIPS_EXC_MAX) {
44 		kvm_mips_callbacks->irq_deliver(vcpu, priority, cause);
45 
46 		priority = find_next_bit(pending,
47 					 BITS_PER_BYTE * sizeof(*pending),
48 					 priority + 1);
49 	}
50 
51 }
52 
kvm_mips_pending_timer(struct kvm_vcpu * vcpu)53 int kvm_mips_pending_timer(struct kvm_vcpu *vcpu)
54 {
55 	return test_bit(MIPS_EXC_INT_TIMER, &vcpu->arch.pending_exceptions);
56 }
57