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 }