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   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
  22 #ifndef __ASM_PARAVIRT_H
  23 #define __ASM_PARAVIRT_H
  24
  25 #ifdef CONFIG_PARAVIRT_GUEST
  26
  27 #define PARAVIRT_HYPERVISOR_TYPE_DEFAULT        0
  28 #define PARAVIRT_HYPERVISOR_TYPE_XEN            1
  29
  30 #ifndef __ASSEMBLY__
  31
  32 #include <asm/hw_irq.h>
  33 #include <asm/meminit.h>
  34
  35 /******************************************************************************
  36  * general info
  37  */
  38 struct pv_info {
  39         unsigned int kernel_rpl;
  40         int paravirt_enabled;
  41         const char *name;
  42 };
  43
  44 extern struct pv_info pv_info;
  45
  46 static inline int paravirt_enabled(void)
  47 {
  48         return pv_info.paravirt_enabled;
  49 }
  50
  51 static inline unsigned int get_kernel_rpl(void)
  52 {
  53         return pv_info.kernel_rpl;
  54 }
  55
  56 /******************************************************************************
  57  * initialization hooks.
  58  */
  59 struct rsvd_region;
  60
  61 struct pv_init_ops {
  62         void (*banner)(void);
  63
  64         int (*reserve_memory)(struct rsvd_region *region);
  65
  66         void (*arch_setup_early)(void);
  67         void (*arch_setup_console)(char **cmdline_p);
  68         int (*arch_setup_nomca)(void);
  69
  70         void (*post_smp_prepare_boot_cpu)(void);
  71 };
  72
  73 extern struct pv_init_ops pv_init_ops;
  74
  75 static inline void paravirt_banner(void)
  76 {
  77         if (pv_init_ops.banner)
  78                 pv_init_ops.banner();
  79 }
  80
  81 static inline int paravirt_reserve_memory(struct rsvd_region *region)
  82 {
  83         if (pv_init_ops.reserve_memory)
  84                 return pv_init_ops.reserve_memory(region);
  85         return 0;
  86 }
  87
  88 static inline void paravirt_arch_setup_early(void)
  89 {
  90         if (pv_init_ops.arch_setup_early)
  91                 pv_init_ops.arch_setup_early();
  92 }
  93
  94 static inline void paravirt_arch_setup_console(char **cmdline_p)
  95 {
  96         if (pv_init_ops.arch_setup_console)
  97                 pv_init_ops.arch_setup_console(cmdline_p);
  98 }
  99
 100 static inline int paravirt_arch_setup_nomca(void)
 101 {
 102         if (pv_init_ops.arch_setup_nomca)
 103                 return pv_init_ops.arch_setup_nomca();
 104         return 0;
 105 }
 106
 107 static inline void paravirt_post_smp_prepare_boot_cpu(void)
 108 {
 109         if (pv_init_ops.post_smp_prepare_boot_cpu)
 110                 pv_init_ops.post_smp_prepare_boot_cpu();
 111 }
 112
 113 /******************************************************************************
 114  * replacement of iosapic operations.
 115  */
 116
 117 struct pv_iosapic_ops {
 118         void (*pcat_compat_init)(void);
 119
 120         struct irq_chip *(*__get_irq_chip)(unsigned long trigger);
 121
 122         unsigned int (*__read)(char __iomem *iosapic, unsigned int reg);
 123         void (*__write)(char __iomem *iosapic, unsigned int reg, u32 val);
 124 };
 125
 126 extern struct pv_iosapic_ops pv_iosapic_ops;
 127
 128 static inline void
 129 iosapic_pcat_compat_init(void)
 130 {
 131         if (pv_iosapic_ops.pcat_compat_init)
 132                 pv_iosapic_ops.pcat_compat_init();
 133 }
 134
 135 static inline struct irq_chip*
 136 iosapic_get_irq_chip(unsigned long trigger)
 137 {
 138         return pv_iosapic_ops.__get_irq_chip(trigger);
 139 }
 140
 141 static inline unsigned int
 142 __iosapic_read(char __iomem *iosapic, unsigned int reg)
 143 {
 144         return pv_iosapic_ops.__read(iosapic, reg);
 145 }
 146
 147 static inline void
 148 __iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
 149 {
 150         return pv_iosapic_ops.__write(iosapic, reg, val);
 151 }
 152
 153 /******************************************************************************
 154  * replacement of irq operations.
 155  */
 156
 157 struct pv_irq_ops {
 158         void (*register_ipi)(void);
 159
 160         int (*assign_irq_vector)(int irq);
 161         void (*free_irq_vector)(int vector);
 162
 163         void (*register_percpu_irq)(ia64_vector vec,
 164                                     struct irqaction *action);
 165
 166         void (*resend_irq)(unsigned int vector);
 167 };
 168
 169 extern struct pv_irq_ops pv_irq_ops;
 170
 171 static inline void
 172 ia64_register_ipi(void)
 173 {
 174         pv_irq_ops.register_ipi();
 175 }
 176
 177 static inline int
 178 assign_irq_vector(int irq)
 179 {
 180         return pv_irq_ops.assign_irq_vector(irq);
 181 }
 182
 183 static inline void
 184 free_irq_vector(int vector)
 185 {
 186         return pv_irq_ops.free_irq_vector(vector);
 187 }
 188
 189 static inline void
 190 register_percpu_irq(ia64_vector vec, struct irqaction *action)
 191 {
 192         pv_irq_ops.register_percpu_irq(vec, action);
 193 }
 194
 195 static inline void
 196 ia64_resend_irq(unsigned int vector)
 197 {
 198         pv_irq_ops.resend_irq(vector);
 199 }
 200
 201 /******************************************************************************
 202  * replacement of time operations.
 203  */
 204
 205 extern struct itc_jitter_data_t itc_jitter_data;
 206 extern volatile int time_keeper_id;
 207
 208 struct pv_time_ops {
 209         void (*init_missing_ticks_accounting)(int cpu);
 210         int (*do_steal_accounting)(unsigned long *new_itm);
 211
 212         void (*clocksource_resume)(void);
 213 };
 214
 215 extern struct pv_time_ops pv_time_ops;
 216
 217 static inline void
 218 paravirt_init_missing_ticks_accounting(int cpu)
 219 {
 220         if (pv_time_ops.init_missing_ticks_accounting)
 221                 pv_time_ops.init_missing_ticks_accounting(cpu);
 222 }
 223
 224 static inline int
 225 paravirt_do_steal_accounting(unsigned long *new_itm)
 226 {
 227         return pv_time_ops.do_steal_accounting(new_itm);
 228 }
 229
 230 #endif /* !__ASSEMBLY__ */
 231
 232 #else
 233 /* fallback for native case */
 234
 235 #ifndef __ASSEMBLY__
 236
 237 #define paravirt_banner()                               do { } while (0)
 238 #define paravirt_reserve_memory(region)                 0
 239
 240 #define paravirt_arch_setup_early()                     do { } while (0)
 241 #define paravirt_arch_setup_console(cmdline_p)          do { } while (0)
 242 #define paravirt_arch_setup_nomca()                     0
 243 #define paravirt_post_smp_prepare_boot_cpu()            do { } while (0)
 244
 245 #define paravirt_init_missing_ticks_accounting(cpu)     do { } while (0)
 246 #define paravirt_do_steal_accounting(new_itm)           0
 247
 248 #endif /* __ASSEMBLY__ */
 249
 250
 251 #endif /* CONFIG_PARAVIRT_GUEST */
 252
 253 #endif /* __ASM_PARAVIRT_H */