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   1 /******************************************************************************
   2  * include/asm-ia64/paravirt.h
   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
  24 #ifndef __ASM_PARAVIRT_H
  25 #define __ASM_PARAVIRT_H
  26
  27 #ifdef CONFIG_PARAVIRT_GUEST
  28
  29 #define PARAVIRT_HYPERVISOR_TYPE_DEFAULT        0
  30 #define PARAVIRT_HYPERVISOR_TYPE_XEN            1
  31
  32 #ifndef __ASSEMBLY__
  33
  34 #include <asm/hw_irq.h>
  35 #include <asm/meminit.h>
  36
  37 /******************************************************************************
  38  * general info
  39  */
  40 struct pv_info {
  41         unsigned int kernel_rpl;
  42         int paravirt_enabled;
  43         const char *name;
  44 };
  45
  46 extern struct pv_info pv_info;
  47
  48 static inline int paravirt_enabled(void)
  49 {
  50         return pv_info.paravirt_enabled;
  51 }
  52
  53 static inline unsigned int get_kernel_rpl(void)
  54 {
  55         return pv_info.kernel_rpl;
  56 }
  57
  58 /******************************************************************************
  59  * initialization hooks.
  60  */
  61 struct rsvd_region;
  62
  63 struct pv_init_ops {
  64         void (*banner)(void);
  65
  66         int (*reserve_memory)(struct rsvd_region *region);
  67
  68         void (*arch_setup_early)(void);
  69         void (*arch_setup_console)(char **cmdline_p);
  70         int (*arch_setup_nomca)(void);
  71
  72         void (*post_smp_prepare_boot_cpu)(void);
  73 };
  74
  75 extern struct pv_init_ops pv_init_ops;
  76
  77 static inline void paravirt_banner(void)
  78 {
  79         if (pv_init_ops.banner)
  80                 pv_init_ops.banner();
  81 }
  82
  83 static inline int paravirt_reserve_memory(struct rsvd_region *region)
  84 {
  85         if (pv_init_ops.reserve_memory)
  86                 return pv_init_ops.reserve_memory(region);
  87         return 0;
  88 }
  89
  90 static inline void paravirt_arch_setup_early(void)
  91 {
  92         if (pv_init_ops.arch_setup_early)
  93                 pv_init_ops.arch_setup_early();
  94 }
  95
  96 static inline void paravirt_arch_setup_console(char **cmdline_p)
  97 {
  98         if (pv_init_ops.arch_setup_console)
  99                 pv_init_ops.arch_setup_console(cmdline_p);
 100 }
 101
 102 static inline int paravirt_arch_setup_nomca(void)
 103 {
 104         if (pv_init_ops.arch_setup_nomca)
 105                 return pv_init_ops.arch_setup_nomca();
 106         return 0;
 107 }
 108
 109 static inline void paravirt_post_smp_prepare_boot_cpu(void)
 110 {
 111         if (pv_init_ops.post_smp_prepare_boot_cpu)
 112                 pv_init_ops.post_smp_prepare_boot_cpu();
 113 }
 114
 115 /******************************************************************************
 116  * replacement of iosapic operations.
 117  */
 118
 119 struct pv_iosapic_ops {
 120         void (*pcat_compat_init)(void);
 121
 122         struct irq_chip *(*get_irq_chip)(unsigned long trigger);
 123
 124         unsigned int (*__read)(char __iomem *iosapic, unsigned int reg);
 125         void (*__write)(char __iomem *iosapic, unsigned int reg, u32 val);
 126 };
 127
 128 extern struct pv_iosapic_ops pv_iosapic_ops;
 129
 130 static inline void
 131 iosapic_pcat_compat_init(void)
 132 {
 133         if (pv_iosapic_ops.pcat_compat_init)
 134                 pv_iosapic_ops.pcat_compat_init();
 135 }
 136
 137 static inline struct irq_chip*
 138 iosapic_get_irq_chip(unsigned long trigger)
 139 {
 140         return pv_iosapic_ops.get_irq_chip(trigger);
 141 }
 142
 143 static inline unsigned int
 144 __iosapic_read(char __iomem *iosapic, unsigned int reg)
 145 {
 146         return pv_iosapic_ops.__read(iosapic, reg);
 147 }
 148
 149 static inline void
 150 __iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
 151 {
 152         return pv_iosapic_ops.__write(iosapic, reg, val);
 153 }
 154
 155 #endif /* !__ASSEMBLY__ */
 156
 157 #else
 158 /* fallback for native case */
 159
 160 #ifndef __ASSEMBLY__
 161
 162 #define paravirt_banner()                               do { } while (0)
 163 #define paravirt_reserve_memory(region)                 0
 164
 165 #define paravirt_arch_setup_early()                     do { } while (0)
 166 #define paravirt_arch_setup_console(cmdline_p)          do { } while (0)
 167 #define paravirt_arch_setup_nomca()                     0
 168 #define paravirt_post_smp_prepare_boot_cpu()            do { } while (0)
 169
 170 #endif /* __ASSEMBLY__ */
 171
 172
 173 #endif /* CONFIG_PARAVIRT_GUEST */
 174
 175 #endif /* __ASM_PARAVIRT_H */