x86: rename two e820 related functions
[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/interface/callback.h>
20 #include <xen/interface/physdev.h>
21 #include <xen/features.h>
22
23 #include "xen-ops.h"
24 #include "vdso.h"
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
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;
42         e820_add_region(0, LOWMEMSIZE(), E820_RAM);
43         e820_add_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
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
62 /*
63  * Set the bit indicating "nosegneg" library variants should be used.
64  */
65 static void __init fiddle_vdso(void)
66 {
67         extern const char vdso32_default_start;
68         u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
69         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
70 }
71
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
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
104         xen_enable_sysenter();
105
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;
123
124 #ifdef CONFIG_SMP
125         /* fill cpus_possible with all available cpus */
126         xen_fill_possible_map();
127 #endif
128
129         paravirt_disable_iospace();
130
131         fiddle_vdso();
132 }