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x86, xen, vdso: fix build error
[mirror_ubuntu-artful-kernel.git] / arch / x86 / xen / setup.c
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1/*
2 * Machine specific setup for xen
3 *
4 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
5 */
6
7#include <linux/module.h>
8#include <linux/sched.h>
9#include <linux/mm.h>
10#include <linux/pm.h>
11
12#include <asm/elf.h>
6c3652ef 13#include <asm/vdso.h>
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14#include <asm/e820.h>
15#include <asm/setup.h>
b792c755 16#include <asm/acpi.h>
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17#include <asm/xen/hypervisor.h>
18#include <asm/xen/hypercall.h>
19
8006ec3e 20#include <xen/page.h>
e2a81baf 21#include <xen/interface/callback.h>
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22#include <xen/interface/physdev.h>
23#include <xen/features.h>
24
25#include "xen-ops.h"
d2eea68e 26#include "vdso.h"
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27
28/* These are code, but not functions. Defined in entry.S */
29extern const char xen_hypervisor_callback[];
30extern const char xen_failsafe_callback[];
31
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32
33/**
34 * machine_specific_memory_setup - Hook for machine specific memory setup.
35 **/
36
37char * __init xen_memory_setup(void)
38{
39 unsigned long max_pfn = xen_start_info->nr_pages;
40
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41 max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
42
5ead97c8 43 e820.nr_map = 0;
be5bf9fa 44
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45 e820_add_region(0, PFN_PHYS(max_pfn), E820_RAM);
46
47 /*
48 * Even though this is normal, usable memory under Xen, reserve
49 * ISA memory anyway because too many things think they can poke
50 * about in there.
51 */
52 e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
53 E820_RESERVED);
5ead97c8 54
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55 /*
56 * Reserve Xen bits:
57 * - mfn_list
58 * - xen_start_info
59 * See comment above "struct start_info" in <xen/interface/xen.h>
60 */
61 e820_add_region(__pa(xen_start_info->mfn_list),
62 xen_start_info->pt_base - xen_start_info->mfn_list,
63 E820_RESERVED);
64
65 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
66
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67 return "Xen";
68}
69
70static void xen_idle(void)
71{
72 local_irq_disable();
73
74 if (need_resched())
75 local_irq_enable();
76 else {
77 current_thread_info()->status &= ~TS_POLLING;
78 smp_mb__after_clear_bit();
79 safe_halt();
80 current_thread_info()->status |= TS_POLLING;
81 }
82}
83
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84/*
85 * Set the bit indicating "nosegneg" library variants should be used.
86 */
08b6d290 87static void __init fiddle_vdso(void)
d2eea68e 88{
6fcac6d3 89#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
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90 extern const char vdso32_default_start;
91 u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
d2eea68e 92 *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
6fcac6d3 93#endif
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94}
95
88459d4c 96static __cpuinit int register_callback(unsigned type, const void *func)
e2a81baf 97{
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98 struct callback_register callback = {
99 .type = type,
100 .address = XEN_CALLBACK(__KERNEL_CS, func),
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101 .flags = CALLBACKF_mask_events,
102 };
103
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104 return HYPERVISOR_callback_op(CALLBACKOP_register, &callback);
105}
106
107void __cpuinit xen_enable_sysenter(void)
108{
88459d4c 109 extern void xen_sysenter_target(void);
6fcac6d3 110 int ret;
62541c37 111 unsigned sysenter_feature;
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112
113#ifdef CONFIG_X86_32
62541c37 114 sysenter_feature = X86_FEATURE_SEP;
6fcac6d3 115#else
62541c37 116 sysenter_feature = X86_FEATURE_SYSENTER32;
6fcac6d3 117#endif
88459d4c 118
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119 if (!boot_cpu_has(sysenter_feature))
120 return;
121
6fcac6d3 122 ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
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123 if(ret != 0)
124 setup_clear_cpu_cap(sysenter_feature);
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125}
126
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127void __cpuinit xen_enable_syscall(void)
128{
129#ifdef CONFIG_X86_64
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130 int ret;
131 extern void xen_syscall_target(void);
132 extern void xen_syscall32_target(void);
133
134 ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
135 if (ret != 0) {
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136 printk(KERN_ERR "Failed to set syscall: %d\n", ret);
137 /* Pretty fatal; 64-bit userspace has no other
138 mechanism for syscalls. */
139 }
140
141 if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
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142 ret = register_callback(CALLBACKTYPE_syscall32,
143 xen_syscall32_target);
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144 if (ret != 0) {
145 printk(KERN_INFO "Xen: 32-bit syscall not supported: disabling vdso\n");
146 setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
71415c6a 147#ifdef CONFIG_COMPAT
62541c37 148 sysctl_vsyscall32 = 0;
71415c6a 149#endif
62541c37 150 }
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151 }
152#endif /* CONFIG_X86_64 */
153}
154
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155void __init xen_arch_setup(void)
156{
157 struct physdev_set_iopl set_iopl;
158 int rc;
159
160 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
161 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
162
163 if (!xen_feature(XENFEAT_auto_translated_physmap))
164 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
165
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166 if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) ||
167 register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
168 BUG();
5ead97c8 169
e2a81baf 170 xen_enable_sysenter();
6fcac6d3 171 xen_enable_syscall();
e2a81baf 172
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173 set_iopl.iopl = 1;
174 rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
175 if (rc != 0)
176 printk(KERN_INFO "physdev_op failed %d\n", rc);
177
178#ifdef CONFIG_ACPI
179 if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
180 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
181 disable_acpi();
182 }
183#endif
184
185 memcpy(boot_command_line, xen_start_info->cmd_line,
186 MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
187 COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
188
189 pm_idle = xen_idle;
f87e4cac 190
dfdcdd42 191 paravirt_disable_iospace();
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192
193 fiddle_vdso();
5ead97c8 194}