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 #include "vdso.h" 23 24 /* These are code, but not functions. Defined in entry.S */ 25 extern const char xen_hypervisor_callback[]; 26 extern const char xen_failsafe_callback[]; 27 28 unsigned long *phys_to_machine_mapping; 29 EXPORT_SYMBOL(phys_to_machine_mapping); 30 31 /** 32 * machine_specific_memory_setup - Hook for machine specific memory setup. 33 **/ 34 35 char * __init xen_memory_setup(void) 36 { 37 unsigned long max_pfn = xen_start_info->nr_pages; 38 39 e820.nr_map = 0; 40 add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM); 41 42 return "Xen"; 43 } 44 45 static void xen_idle(void) 46 { 47 local_irq_disable(); 48 49 if (need_resched()) 50 local_irq_enable(); 51 else { 52 current_thread_info()->status &= ~TS_POLLING; 53 smp_mb__after_clear_bit(); 54 safe_halt(); 55 current_thread_info()->status |= TS_POLLING; 56 } 57 } 58 59 /* 60 * Set the bit indicating "nosegneg" library variants should be used. 61 */ 62 static void fiddle_vdso(void) 63 { 64 extern u32 VDSO_NOTE_MASK; /* See ../kernel/vsyscall-note.S. */ 65 extern char vsyscall_int80_start; 66 u32 *mask = (u32 *) ((unsigned long) &VDSO_NOTE_MASK - VDSO_PRELINK + 67 &vsyscall_int80_start); 68 *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; 69 } 70 71 void __init xen_arch_setup(void) 72 { 73 struct physdev_set_iopl set_iopl; 74 int rc; 75 76 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments); 77 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables); 78 79 if (!xen_feature(XENFEAT_auto_translated_physmap)) 80 HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3); 81 82 HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback, 83 __KERNEL_CS, (unsigned long)xen_failsafe_callback); 84 85 set_iopl.iopl = 1; 86 rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); 87 if (rc != 0) 88 printk(KERN_INFO "physdev_op failed %d\n", rc); 89 90 #ifdef CONFIG_ACPI 91 if (!(xen_start_info->flags & SIF_INITDOMAIN)) { 92 printk(KERN_INFO "ACPI in unprivileged domain disabled\n"); 93 disable_acpi(); 94 } 95 #endif 96 97 memcpy(boot_command_line, xen_start_info->cmd_line, 98 MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ? 99 COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE); 100 101 pm_idle = xen_idle; 102 103 #ifdef CONFIG_SMP 104 /* fill cpus_possible with all available cpus */ 105 xen_fill_possible_map(); 106 #endif 107 108 paravirt_disable_iospace(); 109 110 fiddle_vdso(); 111 } 112