xen: reserve ISA space in e820 map
[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/acpi.h>
17 #include <asm/xen/hypervisor.h>
18 #include <asm/xen/hypercall.h>
19
20 #include <xen/page.h>
21 #include <xen/interface/callback.h>
22 #include <xen/interface/physdev.h>
23 #include <xen/features.h>
24
25 #include "xen-ops.h"
26 #include "vdso.h"
27
28 /* These are code, but not functions.  Defined in entry.S */
29 extern const char xen_hypervisor_callback[];
30 extern const char xen_failsafe_callback[];
31
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         max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
42
43         e820.nr_map = 0;
44
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);
54
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
67         return "Xen";
68 }
69
70 static 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
84 /*
85  * Set the bit indicating "nosegneg" library variants should be used.
86  */
87 static void __init fiddle_vdso(void)
88 {
89         extern const char vdso32_default_start;
90         u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
91         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
92 }
93
94 void xen_enable_sysenter(void)
95 {
96         int cpu = smp_processor_id();
97         extern void xen_sysenter_target(void);
98         /* Mask events on entry, even though they get enabled immediately */
99         static struct callback_register sysenter = {
100                 .type = CALLBACKTYPE_sysenter,
101                 .address = { __KERNEL_CS, (unsigned long)xen_sysenter_target },
102                 .flags = CALLBACKF_mask_events,
103         };
104
105         if (!boot_cpu_has(X86_FEATURE_SEP) ||
106             HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) {
107                 clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
108                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
109         }
110 }
111
112 void __init xen_arch_setup(void)
113 {
114         struct physdev_set_iopl set_iopl;
115         int rc;
116
117         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
118         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
119
120         if (!xen_feature(XENFEAT_auto_translated_physmap))
121                 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
122
123         HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
124                                  __KERNEL_CS, (unsigned long)xen_failsafe_callback);
125
126         xen_enable_sysenter();
127
128         set_iopl.iopl = 1;
129         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
130         if (rc != 0)
131                 printk(KERN_INFO "physdev_op failed %d\n", rc);
132
133 #ifdef CONFIG_ACPI
134         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
135                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
136                 disable_acpi();
137         }
138 #endif
139
140         memcpy(boot_command_line, xen_start_info->cmd_line,
141                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
142                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
143
144         pm_idle = xen_idle;
145
146 #ifdef CONFIG_SMP
147         /* fill cpus_possible with all available cpus */
148         xen_fill_possible_map();
149 #endif
150
151         paravirt_disable_iospace();
152
153         fiddle_vdso();
154 }