arch/ia64/xen/xensetup.S

   1 /*
   2  * Support routines for Xen
   3  *
   4  * Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@hp.com>
   5  */
   6
   7 #include <asm/processor.h>
   8 #include <asm/asmmacro.h>
   9 #include <asm/pgtable.h>
  10 #include <asm/paravirt.h>
  11 #include <asm/xen/privop.h>
  12 #include <linux/elfnote.h>
  13 #include <linux/init.h>
  14 #include <xen/interface/elfnote.h>
  15
  16         .section .data..read_mostly
  17         .align 8
  18         .global xen_domain_type
  19 xen_domain_type:
  20         data4 XEN_NATIVE_ASM
  21         .previous
  22
  23         __INIT
  24 ENTRY(startup_xen)
  25         // Calculate load offset.
  26         // The constant, LOAD_OFFSET, can't be used because the boot
  27         // loader doesn't always load to the LMA specified by the vmlinux.lds.
  28         mov r9=ip       // must be the first instruction to make sure
  29                         // that r9 = the physical address of startup_xen.
  30                         // Usually r9 = startup_xen - LOAD_OFFSET
  31         movl r8=startup_xen
  32         ;;
  33         sub r9=r9,r8    // Usually r9 = -LOAD_OFFSET.
  34
  35         mov r10=PARAVIRT_HYPERVISOR_TYPE_XEN
  36         movl r11=_start
  37         ;;
  38         add r11=r11,r9
  39         movl r8=hypervisor_type
  40         ;;
  41         add r8=r8,r9
  42         mov b0=r11
  43         ;;
  44         st8 [r8]=r10
  45         br.cond.sptk.many b0
  46         ;;
  47 END(startup_xen)
  48
  49         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,      .asciz "linux")
  50         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
  51         ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,   .asciz "xen-3.0")
  52         ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,         data8.ua startup_xen - LOAD_OFFSET)
  53
  54 #define isBP    p3      // are we the Bootstrap Processor?
  55
  56 GLOBAL_ENTRY(xen_setup_hook)
  57         mov r8=XEN_PV_DOMAIN_ASM
  58 (isBP)  movl r9=xen_domain_type;;
  59 (isBP)  st4 [r9]=r8
  60         movl r10=xen_ivt;;
  61
  62         mov cr.iva=r10
  63
  64         /* Set xsi base.  */
  65 #define FW_HYPERCALL_SET_SHARED_INFO_VA                 0x600
  66 (isBP)  mov r2=FW_HYPERCALL_SET_SHARED_INFO_VA
  67 (isBP)  movl r28=XSI_BASE;;
  68 (isBP)  break 0x1000;;
  69
  70         /* setup pv_ops */
  71 (isBP)  mov r4=rp
  72         ;;
  73 (isBP)  br.call.sptk.many rp=xen_setup_pv_ops
  74         ;;
  75 (isBP)  mov rp=r4
  76         ;;
  77
  78         br.ret.sptk.many rp
  79         ;;
  80 END(xen_setup_hook)