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Commit | Line | Data |
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5ead97c8 JF |
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> |
5ead97c8 JF |
14 | #include <asm/e820.h> |
15 | #include <asm/setup.h> | |
16 | #include <asm/xen/hypervisor.h> | |
17 | #include <asm/xen/hypercall.h> | |
18 | ||
e2a81baf | 19 | #include <xen/interface/callback.h> |
5ead97c8 JF |
20 | #include <xen/interface/physdev.h> |
21 | #include <xen/features.h> | |
22 | ||
23 | #include "xen-ops.h" | |
d2eea68e | 24 | #include "vdso.h" |
5ead97c8 JF |
25 | |
26 | /* These are code, but not functions. Defined in entry.S */ | |
27 | extern const char xen_hypervisor_callback[]; | |
28 | extern const char xen_failsafe_callback[]; | |
29 | ||
5ead97c8 JF |
30 | unsigned long *phys_to_machine_mapping; |
31 | EXPORT_SYMBOL(phys_to_machine_mapping); | |
32 | ||
33 | /** | |
34 | * machine_specific_memory_setup - Hook for machine specific memory setup. | |
35 | **/ | |
36 | ||
37 | char * __init xen_memory_setup(void) | |
38 | { | |
39 | unsigned long max_pfn = xen_start_info->nr_pages; | |
40 | ||
41 | e820.nr_map = 0; | |
87d034f3 IC |
42 | add_memory_region(0, LOWMEMSIZE(), E820_RAM); |
43 | add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM); | |
5ead97c8 JF |
44 | |
45 | return "Xen"; | |
46 | } | |
47 | ||
48 | static void xen_idle(void) | |
49 | { | |
50 | local_irq_disable(); | |
51 | ||
52 | if (need_resched()) | |
53 | local_irq_enable(); | |
54 | else { | |
55 | current_thread_info()->status &= ~TS_POLLING; | |
56 | smp_mb__after_clear_bit(); | |
57 | safe_halt(); | |
58 | current_thread_info()->status |= TS_POLLING; | |
59 | } | |
60 | } | |
61 | ||
d2eea68e RM |
62 | /* |
63 | * Set the bit indicating "nosegneg" library variants should be used. | |
64 | */ | |
08b6d290 | 65 | static void __init fiddle_vdso(void) |
d2eea68e | 66 | { |
af65d648 RM |
67 | extern const char vdso32_default_start; |
68 | u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK); | |
d2eea68e RM |
69 | *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
70 | } | |
71 | ||
e2a81baf JF |
72 | void xen_enable_sysenter(void) |
73 | { | |
74 | int cpu = smp_processor_id(); | |
75 | extern void xen_sysenter_target(void); | |
76 | /* Mask events on entry, even though they get enabled immediately */ | |
77 | static struct callback_register sysenter = { | |
78 | .type = CALLBACKTYPE_sysenter, | |
79 | .address = { __KERNEL_CS, (unsigned long)xen_sysenter_target }, | |
80 | .flags = CALLBACKF_mask_events, | |
81 | }; | |
82 | ||
83 | if (!boot_cpu_has(X86_FEATURE_SEP) || | |
84 | HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) { | |
85 | clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP); | |
86 | clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP); | |
87 | } | |
88 | } | |
89 | ||
5ead97c8 JF |
90 | void __init xen_arch_setup(void) |
91 | { | |
92 | struct physdev_set_iopl set_iopl; | |
93 | int rc; | |
94 | ||
95 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments); | |
96 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables); | |
97 | ||
98 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
99 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3); | |
100 | ||
101 | HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback, | |
102 | __KERNEL_CS, (unsigned long)xen_failsafe_callback); | |
103 | ||
e2a81baf JF |
104 | xen_enable_sysenter(); |
105 | ||
5ead97c8 JF |
106 | set_iopl.iopl = 1; |
107 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); | |
108 | if (rc != 0) | |
109 | printk(KERN_INFO "physdev_op failed %d\n", rc); | |
110 | ||
111 | #ifdef CONFIG_ACPI | |
112 | if (!(xen_start_info->flags & SIF_INITDOMAIN)) { | |
113 | printk(KERN_INFO "ACPI in unprivileged domain disabled\n"); | |
114 | disable_acpi(); | |
115 | } | |
116 | #endif | |
117 | ||
118 | memcpy(boot_command_line, xen_start_info->cmd_line, | |
119 | MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ? | |
120 | COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE); | |
121 | ||
122 | pm_idle = xen_idle; | |
f87e4cac JF |
123 | |
124 | #ifdef CONFIG_SMP | |
125 | /* fill cpus_possible with all available cpus */ | |
126 | xen_fill_possible_map(); | |
127 | #endif | |
dfdcdd42 JF |
128 | |
129 | paravirt_disable_iospace(); | |
d2eea68e RM |
130 | |
131 | fiddle_vdso(); | |
5ead97c8 | 132 | } |