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 <<<<<<< HEAD:arch/x86/xen/setup.c
  42         add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM);
  43 =======
  44         add_memory_region(0, LOWMEMSIZE(), E820_RAM);
  45         add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
  46 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/xen/setup.c
  47
  48         return "Xen";
  49 }
  50
  51 static void xen_idle(void)
  52 {
  53         local_irq_disable();
  54
  55         if (need_resched())
  56                 local_irq_enable();
  57         else {
  58                 current_thread_info()->status &= ~TS_POLLING;
  59                 smp_mb__after_clear_bit();
  60                 safe_halt();
  61                 current_thread_info()->status |= TS_POLLING;
  62         }
  63 }
  64
  65 /*
  66  * Set the bit indicating "nosegneg" library variants should be used.
  67  */
  68 static void __init fiddle_vdso(void)
  69 {
  70         extern const char vdso32_default_start;
  71         u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
  72         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
  73 }
  74
  75 void __init xen_arch_setup(void)
  76 {
  77         struct physdev_set_iopl set_iopl;
  78         int rc;
  79
  80         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
  81         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
  82
  83         if (!xen_feature(XENFEAT_auto_translated_physmap))
  84                 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
  85
  86         HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
  87                                  __KERNEL_CS, (unsigned long)xen_failsafe_callback);
  88
  89         set_iopl.iopl = 1;
  90         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
  91         if (rc != 0)
  92                 printk(KERN_INFO "physdev_op failed %d\n", rc);
  93
  94 #ifdef CONFIG_ACPI
  95         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
  96                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
  97                 disable_acpi();
  98         }
  99 #endif
 100
 101         memcpy(boot_command_line, xen_start_info->cmd_line,
 102                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
 103                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
 104
 105         pm_idle = xen_idle;
 106
 107 #ifdef CONFIG_SMP
 108         /* fill cpus_possible with all available cpus */
 109         xen_fill_possible_map();
 110 #endif
 111
 112         paravirt_disable_iospace();
 113
 114         fiddle_vdso();
 115 }