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 <xen/interface/xen.h>
  16 #include <xen/interface/xen-mca.h>
  17 #include <asm/xen/interface.h>
  18
  19         __INIT
  20 ENTRY(startup_xen)
  21         cld
  22
  23         /* Clear .bss */
  24         xor %eax,%eax
  25         mov $__bss_start, %_ASM_DI
  26         mov $__bss_stop, %_ASM_CX
  27         sub %_ASM_DI, %_ASM_CX
  28         shr $__ASM_SEL(2, 3), %_ASM_CX
  29         rep __ASM_SIZE(stos)
  30
  31         mov %_ASM_SI, xen_start_info
  32         mov $init_thread_union+THREAD_SIZE, %_ASM_SP
  33
  34         jmp xen_start_kernel
  35
  36         __FINIT
  37
  38 .pushsection .text
  39         .balign PAGE_SIZE
  40 ENTRY(hypercall_page)
  41         .skip PAGE_SIZE
  42
  43 #define HYPERCALL(n) \
  44         .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
  45         .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
  46 #include <asm/xen-hypercalls.h>
  47 #undef HYPERCALL
  48
  49 .popsection
  50
  51         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,       .asciz "linux")
  52         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION,  .asciz "2.6")
  53         ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,    .asciz "xen-3.0")
  54 #ifdef CONFIG_X86_32
  55         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __PAGE_OFFSET)
  56 #else
  57         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __START_KERNEL_map)
  58         /* Map the p2m table to a 512GB-aligned user address. */
  59         ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M,       .quad PGDIR_SIZE)
  60 #endif
  61         ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          _ASM_PTR startup_xen)
  62         ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
  63         ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
  64                 .ascii "!writable_page_tables|pae_pgdir_above_4gb")
  65         ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
  66                 .long (1 << XENFEAT_writable_page_tables) | (1 << XENFEAT_dom0))
  67         ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz "yes")
  68         ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz "generic")
  69         ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
  70                 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
  71         ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
  72         ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN,  .long 1)
  73         ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW,   _ASM_PTR __HYPERVISOR_VIRT_START)
  74         ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET,   _ASM_PTR 0)
  75
  76 #endif /*CONFIG_XEN */