arch/ia64/kernel/paravirtentry.S

   1 /******************************************************************************
   2  * linux/arch/ia64/xen/paravirtentry.S
   3  *
   4  * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
   5  *                    VA Linux Systems Japan K.K.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 #include <linux/init.h>
  24 #include <asm/asmmacro.h>
  25 #include <asm/asm-offsets.h>
  26 #include <asm/paravirt_privop.h>
  27 #include <asm/paravirt_patch.h>
  28 #include "entry.h"
  29
  30 #define DATA8(sym, init_value)                  \
  31         .pushsection .data.read_mostly ;        \
  32         .align 8 ;                              \
  33         .global sym ;                           \
  34         sym: ;                                  \
  35         data8 init_value ;                      \
  36         .popsection
  37
  38 #define BRANCH(targ, reg, breg, type)                                   \
  39         PARAVIRT_PATCH_SITE_BR(PARAVIRT_PATCH_TYPE_BR_ ## type) ;       \
  40         ;;                                                              \
  41         movl reg=targ ;                                                 \
  42         ;;                                                              \
  43         ld8 reg=[reg] ;                                                 \
  44         ;;                                                              \
  45         mov breg=reg ;                                                  \
  46         br.cond.sptk.many breg
  47
  48 #define BRANCH_PROC(sym, reg, breg, type)                               \
  49         DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ;         \
  50         GLOBAL_ENTRY(paravirt_ ## sym) ;                                \
  51                 BRANCH(paravirt_ ## sym ## _targ, reg, breg, type) ;    \
  52         END(paravirt_ ## sym)
  53
  54 #define BRANCH_PROC_UNWINFO(sym, reg, breg, type)                       \
  55         DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ;         \
  56         GLOBAL_ENTRY(paravirt_ ## sym) ;                                \
  57                 PT_REGS_UNWIND_INFO(0) ;                                \
  58                 BRANCH(paravirt_ ## sym ## _targ, reg, breg, type) ;    \
  59         END(paravirt_ ## sym)
  60
  61
  62 BRANCH_PROC(switch_to, r22, b7, SWITCH_TO)
  63 BRANCH_PROC_UNWINFO(leave_syscall, r22, b7, LEAVE_SYSCALL)
  64 BRANCH_PROC(work_processed_syscall, r2, b7, WORK_PROCESSED_SYSCALL)
  65 BRANCH_PROC_UNWINFO(leave_kernel, r22, b7, LEAVE_KERNEL)
  66
  67
  68 #ifdef CONFIG_MODULES
  69 #define __INIT_OR_MODULE        .text
  70 #define __INITDATA_OR_MODULE    .data
  71 #else
  72 #define __INIT_OR_MODULE        __INIT
  73 #define __INITDATA_OR_MODULE    __INITDATA
  74 #endif /* CONFIG_MODULES */
  75
  76         __INIT_OR_MODULE
  77         GLOBAL_ENTRY(paravirt_fc_i)
  78         fc.i r32
  79         br.ret.sptk.many rp
  80         END(paravirt_fc_i)
  81         __FINIT
  82
  83         __INIT_OR_MODULE
  84         .align 32
  85         GLOBAL_ENTRY(paravirt_nop_b_inst_bundle)
  86         {
  87                 nop.b 0
  88                 nop.b 0
  89                 nop.b 0
  90         }
  91         END(paravirt_nop_b_inst_bundle)
  92         __FINIT
  93
  94         /* NOTE: nop.[mfi] has same format */
  95         __INIT_OR_MODULE
  96         GLOBAL_ENTRY(paravirt_nop_mfi_inst_bundle)
  97         {
  98                 nop.m 0
  99                 nop.f 0
 100                 nop.i 0
 101         }
 102         END(paravirt_nop_mfi_inst_bundle)
 103         __FINIT
 104
 105         __INIT_OR_MODULE
 106         GLOBAL_ENTRY(paravirt_nop_bundle)
 107 paravirt_nop_bundle_start:
 108         {
 109                 nop 0
 110                 nop 0
 111                 nop 0
 112         }
 113 paravirt_nop_bundle_end:
 114         END(paravirt_nop_bundle)
 115         __FINIT
 116
 117         __INITDATA_OR_MODULE
 118         .align 8
 119         .global paravirt_nop_bundle_size
 120 paravirt_nop_bundle_size:
 121         data8   paravirt_nop_bundle_end - paravirt_nop_bundle_start