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   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 static __initdata struct shared_info init_shared;
  28
  29 /*
  30  * Point at some empty memory to start with. We map the real shared_info
  31  * page as soon as fixmap is up and running.
  32  */
  33 struct shared_info *HYPERVISOR_shared_info = &init_shared;
  34
  35 unsigned long *phys_to_machine_mapping;
  36 EXPORT_SYMBOL(phys_to_machine_mapping);
  37
  38 /**
  39  * machine_specific_memory_setup - Hook for machine specific memory setup.
  40  **/
  41
  42 char * __init xen_memory_setup(void)
  43 {
  44         unsigned long max_pfn = xen_start_info->nr_pages;
  45
  46         e820.nr_map = 0;
  47         add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM);
  48
  49         return "Xen";
  50 }
  51
  52 static void xen_idle(void)
  53 {
  54         local_irq_disable();
  55
  56         if (need_resched())
  57                 local_irq_enable();
  58         else {
  59                 current_thread_info()->status &= ~TS_POLLING;
  60                 smp_mb__after_clear_bit();
  61                 safe_halt();
  62                 current_thread_info()->status |= TS_POLLING;
  63         }
  64 }
  65
  66 void __init xen_arch_setup(void)
  67 {
  68         struct physdev_set_iopl set_iopl;
  69         int rc;
  70
  71         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
  72         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
  73
  74         if (!xen_feature(XENFEAT_auto_translated_physmap))
  75                 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
  76
  77         HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
  78                                  __KERNEL_CS, (unsigned long)xen_failsafe_callback);
  79
  80         set_iopl.iopl = 1;
  81         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
  82         if (rc != 0)
  83                 printk(KERN_INFO "physdev_op failed %d\n", rc);
  84
  85 #ifdef CONFIG_ACPI
  86         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
  87                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
  88                 disable_acpi();
  89         }
  90 #endif
  91
  92         memcpy(boot_command_line, xen_start_info->cmd_line,
  93                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
  94                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
  95
  96         pm_idle = xen_idle;
  97 }