arch/ia64/include/asm/paravirt_privop.h

   1 /******************************************************************************
   2  * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
   3  *                    VA Linux Systems Japan K.K.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #ifndef _ASM_IA64_PARAVIRT_PRIVOP_H
  22 #define _ASM_IA64_PARAVIRT_PRIVOP_H
  23
  24 #ifdef CONFIG_PARAVIRT
  25
  26 #ifndef __ASSEMBLY__
  27
  28 #include <linux/types.h>
  29 #include <asm/kregs.h> /* for IA64_PSR_I */
  30
  31 /******************************************************************************
  32  * replacement of intrinsics operations.
  33  */
  34
  35 struct pv_cpu_ops {
  36         void (*fc)(unsigned long addr);
  37         unsigned long (*thash)(unsigned long addr);
  38         unsigned long (*get_cpuid)(int index);
  39         unsigned long (*get_pmd)(int index);
  40         unsigned long (*getreg)(int reg);
  41         void (*setreg)(int reg, unsigned long val);
  42         void (*ptcga)(unsigned long addr, unsigned long size);
  43         unsigned long (*get_rr)(unsigned long index);
  44         void (*set_rr)(unsigned long index, unsigned long val);
  45         void (*set_rr0_to_rr4)(unsigned long val0, unsigned long val1,
  46                                unsigned long val2, unsigned long val3,
  47                                unsigned long val4);
  48         void (*ssm_i)(void);
  49         void (*rsm_i)(void);
  50         unsigned long (*get_psr_i)(void);
  51         void (*intrin_local_irq_restore)(unsigned long flags);
  52 };
  53
  54 extern struct pv_cpu_ops pv_cpu_ops;
  55
  56 extern void ia64_native_setreg_func(int regnum, unsigned long val);
  57 extern unsigned long ia64_native_getreg_func(int regnum);
  58
  59 /************************************************/
  60 /* Instructions paravirtualized for performance */
  61 /************************************************/
  62
  63 /* mask for ia64_native_ssm/rsm() must be constant.("i" constraing).
  64  * static inline function doesn't satisfy it. */
  65 #define paravirt_ssm(mask)                      \
  66         do {                                    \
  67                 if ((mask) == IA64_PSR_I)       \
  68                         pv_cpu_ops.ssm_i();     \
  69                 else                            \
  70                         ia64_native_ssm(mask);  \
  71         } while (0)
  72
  73 #define paravirt_rsm(mask)                      \
  74         do {                                    \
  75                 if ((mask) == IA64_PSR_I)       \
  76                         pv_cpu_ops.rsm_i();     \
  77                 else                            \
  78                         ia64_native_rsm(mask);  \
  79         } while (0)
  80
  81 /* returned ip value should be the one in the caller,
  82  * not in __paravirt_getreg() */
  83 #define paravirt_getreg(reg)                                    \
  84         ({                                                      \
  85                 unsigned long res;                              \
  86                 if ((reg) == _IA64_REG_IP)                      \
  87                         res = ia64_native_getreg(_IA64_REG_IP); \
  88                 else                                            \
  89                         res = pv_cpu_ops.getreg(reg);           \
  90                 res;                                            \
  91         })
  92
  93 /******************************************************************************
  94  * replacement of hand written assembly codes.
  95  */
  96 struct pv_cpu_asm_switch {
  97         unsigned long switch_to;
  98         unsigned long leave_syscall;
  99         unsigned long work_processed_syscall;
 100         unsigned long leave_kernel;
 101 };
 102 void paravirt_cpu_asm_init(const struct pv_cpu_asm_switch *cpu_asm_switch);
 103
 104 #endif /* __ASSEMBLY__ */
 105
 106 #define IA64_PARAVIRT_ASM_FUNC(name)    paravirt_ ## name
 107
 108 #else
 109
 110 /* fallback for native case */
 111 #define IA64_PARAVIRT_ASM_FUNC(name)    ia64_native_ ## name
 112
 113 #endif /* CONFIG_PARAVIRT */
 114
 115 /* these routines utilize privilege-sensitive or performance-sensitive
 116  * privileged instructions so the code must be replaced with
 117  * paravirtualized versions */
 118 #define ia64_switch_to                  IA64_PARAVIRT_ASM_FUNC(switch_to)
 119 #define ia64_leave_syscall              IA64_PARAVIRT_ASM_FUNC(leave_syscall)
 120 #define ia64_work_processed_syscall     \
 121         IA64_PARAVIRT_ASM_FUNC(work_processed_syscall)
 122 #define ia64_leave_kernel               IA64_PARAVIRT_ASM_FUNC(leave_kernel)
 123
 124 #endif /* _ASM_IA64_PARAVIRT_PRIVOP_H */