arch/i386/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/e820.h>
  14 #include <asm/setup.h>
  15 #include <asm/xen/hypervisor.h>
  16 #include <asm/xen/hypercall.h>
  17
  18 #include <xen/interface/physdev.h>
  19 #include <xen/features.h>
  20
  21 #include "xen-ops.h"
  22
  23 /* These are code, but not functions.  Defined in entry.S */
  24 extern const char xen_hypervisor_callback[];
  25 extern const char xen_failsafe_callback[];
  26
  27 unsigned long *phys_to_machine_mapping;
  28 EXPORT_SYMBOL(phys_to_machine_mapping);
  29
  30 /**
  31  * machine_specific_memory_setup - Hook for machine specific memory setup.
  32  **/
  33
  34 char * __init xen_memory_setup(void)
  35 {
  36         unsigned long max_pfn = xen_start_info->nr_pages;
  37
  38         e820.nr_map = 0;
  39         add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM);
  40
  41         return "Xen";
  42 }
  43
  44 static void xen_idle(void)
  45 {
  46         local_irq_disable();
  47
  48         if (need_resched())
  49                 local_irq_enable();
  50         else {
  51                 current_thread_info()->status &= ~TS_POLLING;
  52                 smp_mb__after_clear_bit();
  53                 safe_halt();
  54                 current_thread_info()->status |= TS_POLLING;
  55         }
  56 }
  57
  58 void __init xen_arch_setup(void)
  59 {
  60         struct physdev_set_iopl set_iopl;
  61         int rc;
  62
  63         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
  64         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
  65
  66         if (!xen_feature(XENFEAT_auto_translated_physmap))
  67                 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
  68
  69         HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
  70                                  __KERNEL_CS, (unsigned long)xen_failsafe_callback);
  71
  72         set_iopl.iopl = 1;
  73         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
  74         if (rc != 0)
  75                 printk(KERN_INFO "physdev_op failed %d\n", rc);
  76
  77 #ifdef CONFIG_ACPI
  78         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
  79                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
  80                 disable_acpi();
  81         }
  82 #endif
  83
  84         memcpy(boot_command_line, xen_start_info->cmd_line,
  85                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
  86                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
  87
  88         pm_idle = xen_idle;
  89
  90 #ifdef CONFIG_SMP
  91         /* fill cpus_possible with all available cpus */
  92         xen_fill_possible_map();
  93 #endif
  94
  95         paravirt_disable_iospace();
  96 }