1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License, version 2, as
4 * published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
14 *
15 * Copyright IBM Corp. 2008
16 *
17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
18 */
19
20 #ifndef __ASM_44X_H__
21 #define __ASM_44X_H__
22
23 #include <linux/kvm_host.h>
24
25 #define PPC44x_TLB_SIZE 64
26
27 /* If the guest is expecting it, this can be as large as we like; we'd just
28 * need to find some way of advertising it. */
29 #define KVM44x_GUEST_TLB_SIZE 64
30
31 struct kvmppc_44x_tlbe {
32 u32 tid; /* Only the low 8 bits are used. */
33 u32 word0;
34 u32 word1;
35 u32 word2;
36 };
37
38 struct kvmppc_44x_shadow_ref {
39 struct page *page;
40 u16 gtlb_index;
41 u8 writeable;
42 u8 tid;
43 };
44
45 struct kvmppc_vcpu_44x {
46 /* Unmodified copy of the guest's TLB. */
47 struct kvmppc_44x_tlbe guest_tlb[KVM44x_GUEST_TLB_SIZE];
48
49 /* References to guest pages in the hardware TLB. */
50 struct kvmppc_44x_shadow_ref shadow_refs[PPC44x_TLB_SIZE];
51
52 /* State of the shadow TLB at guest context switch time. */
53 struct kvmppc_44x_tlbe shadow_tlb[PPC44x_TLB_SIZE];
54 u8 shadow_tlb_mod[PPC44x_TLB_SIZE];
55
56 struct kvm_vcpu vcpu;
57 };
58
to_44x(struct kvm_vcpu * vcpu)59 static inline struct kvmppc_vcpu_44x *to_44x(struct kvm_vcpu *vcpu)
60 {
61 return container_of(vcpu, struct kvmppc_vcpu_44x, vcpu);
62 }
63
64 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 new_pid);
65 void kvmppc_44x_tlb_put(struct kvm_vcpu *vcpu);
66 void kvmppc_44x_tlb_load(struct kvm_vcpu *vcpu);
67
68 #endif /* __ASM_44X_H__ */
69