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1 | /****************************************************************************** |
2 | * arch/ia64/xen/hypervisor.c | |
3 | * | |
4 | * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp> | |
5 | * VA Linux Systems Japan K.K. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/efi.h> | |
24 | #include <asm/xen/hypervisor.h> | |
25 | #include <asm/xen/privop.h> | |
26 | ||
27 | #include "irq_xen.h" | |
28 | ||
29 | struct shared_info *HYPERVISOR_shared_info __read_mostly = | |
30 | (struct shared_info *)XSI_BASE; | |
31 | EXPORT_SYMBOL(HYPERVISOR_shared_info); | |
32 | ||
33 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); | |
34 | ||
35 | struct start_info *xen_start_info; | |
36 | EXPORT_SYMBOL(xen_start_info); | |
37 | ||
38 | EXPORT_SYMBOL(xen_domain_type); | |
39 | ||
40 | EXPORT_SYMBOL(__hypercall); | |
41 | ||
42 | /* Stolen from arch/x86/xen/enlighten.c */ | |
43 | /* | |
44 | * Flag to determine whether vcpu info placement is available on all | |
45 | * VCPUs. We assume it is to start with, and then set it to zero on | |
46 | * the first failure. This is because it can succeed on some VCPUs | |
47 | * and not others, since it can involve hypervisor memory allocation, | |
48 | * or because the guest failed to guarantee all the appropriate | |
49 | * constraints on all VCPUs (ie buffer can't cross a page boundary). | |
50 | * | |
51 | * Note that any particular CPU may be using a placed vcpu structure, | |
52 | * but we can only optimise if the all are. | |
53 | * | |
54 | * 0: not available, 1: available | |
55 | */ | |
56 | ||
57 | static void __init xen_vcpu_setup(int cpu) | |
58 | { | |
59 | /* | |
60 | * WARNING: | |
61 | * before changing MAX_VIRT_CPUS, | |
62 | * check that shared_info fits on a page | |
63 | */ | |
64 | BUILD_BUG_ON(sizeof(struct shared_info) > PAGE_SIZE); | |
65 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; | |
66 | } | |
67 | ||
68 | void __init xen_setup_vcpu_info_placement(void) | |
69 | { | |
70 | int cpu; | |
71 | ||
72 | for_each_possible_cpu(cpu) | |
73 | xen_vcpu_setup(cpu); | |
74 | } | |
75 | ||
76 | void __cpuinit | |
77 | xen_cpu_init(void) | |
78 | { | |
79 | xen_smp_intr_init(); | |
80 | } | |
81 | ||
82 | /************************************************************************** | |
83 | * opt feature | |
84 | */ | |
85 | void | |
86 | xen_ia64_enable_opt_feature(void) | |
87 | { | |
88 | /* Enable region 7 identity map optimizations in Xen */ | |
89 | struct xen_ia64_opt_feature optf; | |
90 | ||
91 | optf.cmd = XEN_IA64_OPTF_IDENT_MAP_REG7; | |
92 | optf.on = XEN_IA64_OPTF_ON; | |
93 | optf.pgprot = pgprot_val(PAGE_KERNEL); | |
94 | optf.key = 0; /* No key on linux. */ | |
95 | HYPERVISOR_opt_feature(&optf); | |
96 | } |