arch/x86/xen/xen-head.S

   1 /* Xen-specific pieces of head.S, intended to be included in the right
   2         place in head.S */
   3
   4 #ifdef CONFIG_XEN
   5
   6 #include <linux/elfnote.h>
   7 #include <linux/init.h>
   8
   9 #include <asm/boot.h>
  10 #include <asm/asm.h>
  11 #include <asm/page_types.h>
  12
  13 #include <xen/interface/elfnote.h>
  14 #include <xen/interface/features.h>
  15 #include <asm/xen/interface.h>
  16
  17 #ifdef CONFIG_XEN_PVH
  18 #define PVH_FEATURES_STR  "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel"
  19 /* Note the lack of 'hvm_callback_vector'. Older hypervisor will
  20  * balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in
  21  * XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore.
  22  */
  23 #define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \
  24                       (1 << XENFEAT_auto_translated_physmap) | \
  25                       (1 << XENFEAT_supervisor_mode_kernel) | \
  26                       (1 << XENFEAT_hvm_callback_vector))
  27 /* The XENFEAT_writable_page_tables is not stricly neccessary as we set that
  28  * up regardless whether this CONFIG option is enabled or not, but it
  29  * clarifies what the right flags need to be.
  30  */
  31 #else
  32 #define PVH_FEATURES_STR  ""
  33 #define PVH_FEATURES (0)
  34 #endif
  35
  36         __INIT
  37 ENTRY(startup_xen)
  38         cld
  39 #ifdef CONFIG_X86_32
  40         mov %esi,xen_start_info
  41         mov $init_thread_union+THREAD_SIZE,%esp
  42 #else
  43         mov %rsi,xen_start_info
  44         mov $init_thread_union+THREAD_SIZE,%rsp
  45 #endif
  46         jmp xen_start_kernel
  47
  48         __FINIT
  49
  50 .pushsection .text
  51         .balign PAGE_SIZE
  52 ENTRY(hypercall_page)
  53 #define NEXT_HYPERCALL(x) \
  54         ENTRY(xen_hypercall_##x) \
  55         .skip 32
  56
  57 NEXT_HYPERCALL(set_trap_table)
  58 NEXT_HYPERCALL(mmu_update)
  59 NEXT_HYPERCALL(set_gdt)
  60 NEXT_HYPERCALL(stack_switch)
  61 NEXT_HYPERCALL(set_callbacks)
  62 NEXT_HYPERCALL(fpu_taskswitch)
  63 NEXT_HYPERCALL(sched_op_compat)
  64 NEXT_HYPERCALL(platform_op)
  65 NEXT_HYPERCALL(set_debugreg)
  66 NEXT_HYPERCALL(get_debugreg)
  67 NEXT_HYPERCALL(update_descriptor)
  68 NEXT_HYPERCALL(ni)
  69 NEXT_HYPERCALL(memory_op)
  70 NEXT_HYPERCALL(multicall)
  71 NEXT_HYPERCALL(update_va_mapping)
  72 NEXT_HYPERCALL(set_timer_op)
  73 NEXT_HYPERCALL(event_channel_op_compat)
  74 NEXT_HYPERCALL(xen_version)
  75 NEXT_HYPERCALL(console_io)
  76 NEXT_HYPERCALL(physdev_op_compat)
  77 NEXT_HYPERCALL(grant_table_op)
  78 NEXT_HYPERCALL(vm_assist)
  79 NEXT_HYPERCALL(update_va_mapping_otherdomain)
  80 NEXT_HYPERCALL(iret)
  81 NEXT_HYPERCALL(vcpu_op)
  82 NEXT_HYPERCALL(set_segment_base)
  83 NEXT_HYPERCALL(mmuext_op)
  84 NEXT_HYPERCALL(xsm_op)
  85 NEXT_HYPERCALL(nmi_op)
  86 NEXT_HYPERCALL(sched_op)
  87 NEXT_HYPERCALL(callback_op)
  88 NEXT_HYPERCALL(xenoprof_op)
  89 NEXT_HYPERCALL(event_channel_op)
  90 NEXT_HYPERCALL(physdev_op)
  91 NEXT_HYPERCALL(hvm_op)
  92 NEXT_HYPERCALL(sysctl)
  93 NEXT_HYPERCALL(domctl)
  94 NEXT_HYPERCALL(kexec_op)
  95 NEXT_HYPERCALL(tmem_op) /* 38 */
  96 ENTRY(xen_hypercall_rsvr)
  97         .skip 320
  98 NEXT_HYPERCALL(mca) /* 48 */
  99 NEXT_HYPERCALL(arch_1)
 100 NEXT_HYPERCALL(arch_2)
 101 NEXT_HYPERCALL(arch_3)
 102 NEXT_HYPERCALL(arch_4)
 103 NEXT_HYPERCALL(arch_5)
 104 NEXT_HYPERCALL(arch_6)
 105         .balign PAGE_SIZE
 106 .popsection
 107
 108         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,       .asciz "linux")
 109         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION,  .asciz "2.6")
 110         ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,    .asciz "xen-3.0")
 111 #ifdef CONFIG_X86_32
 112         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __PAGE_OFFSET)
 113 #else
 114         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __START_KERNEL_map)
 115 #endif
 116         ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          _ASM_PTR startup_xen)
 117         ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
 118         ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR)
 119         ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) |
 120                                                 (1 << XENFEAT_writable_page_tables) |
 121                                                 (1 << XENFEAT_dom0))
 122         ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz "yes")
 123         ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz "generic")
 124         ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
 125                 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
 126         ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
 127         ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW,   _ASM_PTR __HYPERVISOR_VIRT_START)
 128         ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET,   _ASM_PTR 0)
 129
 130 #endif /*CONFIG_XEN */