x86: not set node to cpu_to_node if the node is not online
[sfrench/cifs-2.6.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/interface/physdev.h>
20 #include <xen/features.h>
21
22 #include "xen-ops.h"
23 #include "vdso.h"
24
25 /* These are code, but not functions.  Defined in entry.S */
26 extern const char xen_hypervisor_callback[];
27 extern const char xen_failsafe_callback[];
28
29 unsigned long *phys_to_machine_mapping;
30 EXPORT_SYMBOL(phys_to_machine_mapping);
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         e820.nr_map = 0;
41         add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM);
42
43         return "Xen";
44 }
45
46 static void xen_idle(void)
47 {
48         local_irq_disable();
49
50         if (need_resched())
51                 local_irq_enable();
52         else {
53                 current_thread_info()->status &= ~TS_POLLING;
54                 smp_mb__after_clear_bit();
55                 safe_halt();
56                 current_thread_info()->status |= TS_POLLING;
57         }
58 }
59
60 /*
61  * Set the bit indicating "nosegneg" library variants should be used.
62  */
63 static void __init fiddle_vdso(void)
64 {
65         extern const char vdso32_default_start;
66         u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
67         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
68 }
69
70 void __init xen_arch_setup(void)
71 {
72         struct physdev_set_iopl set_iopl;
73         int rc;
74
75         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
76         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
77
78         if (!xen_feature(XENFEAT_auto_translated_physmap))
79                 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
80
81         HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
82                                  __KERNEL_CS, (unsigned long)xen_failsafe_callback);
83
84         set_iopl.iopl = 1;
85         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
86         if (rc != 0)
87                 printk(KERN_INFO "physdev_op failed %d\n", rc);
88
89 #ifdef CONFIG_ACPI
90         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
91                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
92                 disable_acpi();
93         }
94 #endif
95
96         memcpy(boot_command_line, xen_start_info->cmd_line,
97                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
98                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
99
100         pm_idle = xen_idle;
101
102 #ifdef CONFIG_SMP
103         /* fill cpus_possible with all available cpus */
104         xen_fill_possible_map();
105 #endif
106
107         paravirt_disable_iospace();
108
109         fiddle_vdso();
110 }