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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/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/page.h>
  20 #include <xen/interface/callback.h>
  21 #include <xen/interface/physdev.h>
  22 #include <xen/features.h>
  23
  24 #include "xen-ops.h"
  25 #include "vdso.h"
  26
  27 /* These are code, but not functions.  Defined in entry.S */
  28 extern const char xen_hypervisor_callback[];
  29 extern const char xen_failsafe_callback[];
  30
  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         max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
  41
  42         e820.nr_map = 0;
  43
  44         e820_add_region(0, LOWMEMSIZE(), E820_RAM);
  45         e820_add_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
  46
  47         /*
  48          * Reserve Xen bits:
  49          *  - mfn_list
  50          *  - xen_start_info
  51          * See comment above "struct start_info" in <xen/interface/xen.h>
  52          */
  53         e820_add_region(__pa(xen_start_info->mfn_list),
  54                         xen_start_info->pt_base - xen_start_info->mfn_list,
  55                         E820_RESERVED);
  56
  57         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
  58
  59         return "Xen";
  60 }
  61
  62 static void xen_idle(void)
  63 {
  64         local_irq_disable();
  65
  66         if (need_resched())
  67                 local_irq_enable();
  68         else {
  69                 current_thread_info()->status &= ~TS_POLLING;
  70                 smp_mb__after_clear_bit();
  71                 safe_halt();
  72                 current_thread_info()->status |= TS_POLLING;
  73         }
  74 }
  75
  76 /*
  77  * Set the bit indicating "nosegneg" library variants should be used.
  78  */
  79 static void __init fiddle_vdso(void)
  80 {
  81         extern const char vdso32_default_start;
  82         u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
  83         *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
  84 }
  85
  86 void xen_enable_sysenter(void)
  87 {
  88         int cpu = smp_processor_id();
  89         extern void xen_sysenter_target(void);
  90         /* Mask events on entry, even though they get enabled immediately */
  91         static struct callback_register sysenter = {
  92                 .type = CALLBACKTYPE_sysenter,
  93                 .address = { __KERNEL_CS, (unsigned long)xen_sysenter_target },
  94                 .flags = CALLBACKF_mask_events,
  95         };
  96
  97         if (!boot_cpu_has(X86_FEATURE_SEP) ||
  98             HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) {
  99                 clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
 100                 clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
 101         }
 102 }
 103
 104 void __init xen_arch_setup(void)
 105 {
 106         struct physdev_set_iopl set_iopl;
 107         int rc;
 108
 109         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
 110         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
 111
 112         if (!xen_feature(XENFEAT_auto_translated_physmap))
 113                 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
 114
 115         HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
 116                                  __KERNEL_CS, (unsigned long)xen_failsafe_callback);
 117
 118         xen_enable_sysenter();
 119
 120         set_iopl.iopl = 1;
 121         rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
 122         if (rc != 0)
 123                 printk(KERN_INFO "physdev_op failed %d\n", rc);
 124
 125 #ifdef CONFIG_ACPI
 126         if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
 127                 printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
 128                 disable_acpi();
 129         }
 130 #endif
 131
 132         memcpy(boot_command_line, xen_start_info->cmd_line,
 133                MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
 134                COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
 135
 136         pm_idle = xen_idle;
 137
 138 #ifdef CONFIG_SMP
 139         /* fill cpus_possible with all available cpus */
 140         xen_fill_possible_map();
 141 #endif
 142
 143         paravirt_disable_iospace();
 144
 145         fiddle_vdso();
 146 }