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 #ifdef CONFIG_XEN_PV
  20         __INIT
  21 ENTRY(startup_xen)
  22         cld
  23
  24         /* Clear .bss */
  25         xor %eax,%eax
  26         mov $__bss_start, %_ASM_DI
  27         mov $__bss_stop, %_ASM_CX
  28         sub %_ASM_DI, %_ASM_CX
  29         shr $__ASM_SEL(2, 3), %_ASM_CX
  30         rep __ASM_SIZE(stos)
  31
  32         mov %_ASM_SI, xen_start_info
  33         mov $init_thread_union+THREAD_SIZE, %_ASM_SP
  34
  35         jmp xen_start_kernel
  36
  37         __FINIT
  38 #endif
  39
  40 .pushsection .text
  41         .balign PAGE_SIZE
  42 ENTRY(hypercall_page)
  43         .skip PAGE_SIZE
  44
  45 #define HYPERCALL(n) \
  46         .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
  47         .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
  48 #include <asm/xen-hypercalls.h>
  49 #undef HYPERCALL
  50
  51 .popsection
  52
  53         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,       .asciz "linux")
  54         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION,  .asciz "2.6")
  55         ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,    .asciz "xen-3.0")
  56 #ifdef CONFIG_X86_32
  57         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __PAGE_OFFSET)
  58 #else
  59         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __START_KERNEL_map)
  60         /* Map the p2m table to a 512GB-aligned user address. */
  61         ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M,       .quad PGDIR_SIZE)
  62 #endif
  63 #ifdef CONFIG_XEN_PV
  64         ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          _ASM_PTR startup_xen)
  65 #endif
  66         ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
  67         ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
  68                 .ascii "!writable_page_tables|pae_pgdir_above_4gb")
  69         ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
  70                 .long (1 << XENFEAT_writable_page_tables) | (1 << XENFEAT_dom0))
  71         ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz "yes")
  72         ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz "generic")
  73         ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
  74                 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
  75         ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
  76         ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN,  .long 1)
  77         ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW,   _ASM_PTR __HYPERVISOR_VIRT_START)
  78         ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET,   _ASM_PTR 0)
  79
  80 #endif /*CONFIG_XEN */