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 <linux/export.h>
25 #include <asm/xen/hypervisor.h>
26 #include <asm/xen/privop.h>
27
28 #include "irq_xen.h"
29
30 struct shared_info *HYPERVISOR_shared_info __read_mostly =
31 (struct shared_info *)XSI_BASE;
32 EXPORT_SYMBOL(HYPERVISOR_shared_info);
33
34 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
35
36 struct start_info *xen_start_info;
37 EXPORT_SYMBOL(xen_start_info);
38
39 EXPORT_SYMBOL(xen_domain_type);
40
41 EXPORT_SYMBOL(__hypercall);
42
43 /* Stolen from arch/x86/xen/enlighten.c */
44 /*
45 * Flag to determine whether vcpu info placement is available on all
46 * VCPUs. We assume it is to start with, and then set it to zero on
47 * the first failure. This is because it can succeed on some VCPUs
48 * and not others, since it can involve hypervisor memory allocation,
49 * or because the guest failed to guarantee all the appropriate
50 * constraints on all VCPUs (ie buffer can't cross a page boundary).
51 *
52 * Note that any particular CPU may be using a placed vcpu structure,
53 * but we can only optimise if the all are.
54 *
55 * 0: not available, 1: available
56 */
57
xen_vcpu_setup(int cpu)58 static void __init xen_vcpu_setup(int cpu)
59 {
60 /*
61 * WARNING:
62 * before changing MAX_VIRT_CPUS,
63 * check that shared_info fits on a page
64 */
65 BUILD_BUG_ON(sizeof(struct shared_info) > PAGE_SIZE);
66 per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
67 }
68
xen_setup_vcpu_info_placement(void)69 void __init xen_setup_vcpu_info_placement(void)
70 {
71 int cpu;
72
73 for_each_possible_cpu(cpu)
74 xen_vcpu_setup(cpu);
75 }
76
77 void __cpuinit
xen_cpu_init(void)78 xen_cpu_init(void)
79 {
80 xen_smp_intr_init();
81 }
82
83 /**************************************************************************
84 * opt feature
85 */
86 void
xen_ia64_enable_opt_feature(void)87 xen_ia64_enable_opt_feature(void)
88 {
89 /* Enable region 7 identity map optimizations in Xen */
90 struct xen_ia64_opt_feature optf;
91
92 optf.cmd = XEN_IA64_OPTF_IDENT_MAP_REG7;
93 optf.on = XEN_IA64_OPTF_ON;
94 optf.pgprot = pgprot_val(PAGE_KERNEL);
95 optf.key = 0; /* No key on linux. */
96 HYPERVISOR_opt_feature(&optf);
97 }
98