Merge branch 'x86/mpparse' into x86/devel
[linux-3.10.git] / arch / x86 / xen / setup.c
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>
13 #include <asm/vdso.h>
14 #include <asm/e820.h>
15 #include <asm/setup.h>
16 #include <asm/xen/hypervisor.h>
17 #include <asm/xen/hypercall.h>
18
19 #include <xen/page.h>
20 #include <xen/interface/callback.h>
21 #include <xen/interface/physdev.h>
22 #include <xen/features.h>
23
24 #include "xen-ops.h"
25 #include "vdso.h"
26
27 /* These are code, but not functions.  Defined in entry.S */
28 extern const char xen_hypervisor_callback[];
29 extern const char xen_failsafe_callback[];
30
31
32 /**
33  * machine_specific_memory_setup - Hook for machine specific memory setup.
34  **/
35
36 char * __init xen_memory_setup(void)
37 {
38         unsigned long max_pfn = xen_start_info->nr_pages;
39
40         max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
41
42         e820.nr_map = 0;
43         e820_add_region(0, LOWMEMSIZE(), E820_RAM);
44         e820_add_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
45
46         return "Xen";
47 }
48
49 static void xen_idle(void)
50 {
51         local_irq_disable();
52
53         if (need_resched())
54                 local_irq_enable();
55         else {
56                 current_thread_info()->status &= ~TS_POLLING;
57                 smp_mb__after_clear_bit();
58                 safe_halt();
59                 current_thread_info()->status |= TS_POLLING;
60         }
61 }
62
63 /*
64  * Set the bit indicating "nosegneg" library variants should be used.
65  */
66 static void __init fiddle_vdso(void)
67 {
68         extern const char vdso32_default_start;
69         u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
70         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
71 }
72
73 void xen_enable_sysenter(void)
74 {
75         int cpu = smp_processor_id();
76         extern void xen_sysenter_target(void);
77         /* Mask events on entry, even though they get enabled immediately */
78         static struct callback_register sysenter = {
79                 .type = CALLBACKTYPE_sysenter,
80                 .address = { __KERNEL_CS, (unsigned long)xen_sysenter_target },
81                 .flags = CALLBACKF_mask_events,
82         };
83
84         if (!boot_cpu_has(X86_FEATURE_SEP) ||
85             HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) {
86                 clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
87                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
88         }
89 }
90
91 void __init xen_arch_setup(void)
92 {
93         struct physdev_set_iopl set_iopl;
94         int rc;
95
96         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
97         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
98
99         if (!xen_feature(XENFEAT_auto_translated_physmap))
100                 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
101
102         HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
103                                  __KERNEL_CS, (unsigned long)xen_failsafe_callback);
104
105         xen_enable_sysenter();
106
107         set_iopl.iopl = 1;
108         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
109         if (rc != 0)
110                 printk(KERN_INFO "physdev_op failed %d\n", rc);
111
112 #ifdef CONFIG_ACPI
113         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
114                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
115                 disable_acpi();
116         }
117 #endif
118
119         memcpy(boot_command_line, xen_start_info->cmd_line,
120                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
121                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
122
123         pm_idle = xen_idle;
124
125 #ifdef CONFIG_SMP
126         /* fill cpus_possible with all available cpus */
127         xen_fill_possible_map();
128 #endif
129
130         paravirt_disable_iospace();
131
132         fiddle_vdso();
133 }