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 add_memory_region(0, LOWMEMSIZE(), E820_RAM); 42 add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM); 43 44 return "Xen"; 45 } 46 47 static void xen_idle(void) 48 { 49 local_irq_disable(); 50 51 if (need_resched()) 52 local_irq_enable(); 53 else { 54 current_thread_info()->status &= ~TS_POLLING; 55 smp_mb__after_clear_bit(); 56 safe_halt(); 57 current_thread_info()->status |= TS_POLLING; 58 } 59 } 60 61 /* 62 * Set the bit indicating "nosegneg" library variants should be used. 63 */ 64 static void __init fiddle_vdso(void) 65 { 66 extern const char vdso32_default_start; 67 u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK); 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