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1 | #ifndef __ASM_PARAVIRT_H | |
2 | #define __ASM_PARAVIRT_H | |
3 | /* Various instructions on x86 need to be replaced for | |
4 | * para-virtualization: those hooks are defined here. */ | |
5 | #include <linux/linkage.h> | |
6 | ||
7 | #ifdef CONFIG_PARAVIRT | |
8 | #ifndef __ASSEMBLY__ | |
9 | struct thread_struct; | |
10 | struct Xgt_desc_struct; | |
11 | struct tss_struct; | |
12 | struct paravirt_ops | |
13 | { | |
14 | unsigned int kernel_rpl; | |
15 | int paravirt_enabled; | |
16 | const char *name; | |
17 | ||
18 | void (*arch_setup)(void); | |
19 | char *(*memory_setup)(void); | |
20 | void (*init_IRQ)(void); | |
21 | ||
22 | void (*banner)(void); | |
23 | ||
24 | unsigned long (*get_wallclock)(void); | |
25 | int (*set_wallclock)(unsigned long); | |
26 | void (*time_init)(void); | |
27 | ||
28 | /* All the function pointers here are declared as "fastcall" | |
29 | so that we get a specific register-based calling | |
30 | convention. This makes it easier to implement inline | |
31 | assembler replacements. */ | |
32 | ||
33 | void (fastcall *cpuid)(unsigned int *eax, unsigned int *ebx, | |
34 | unsigned int *ecx, unsigned int *edx); | |
35 | ||
36 | unsigned long (fastcall *get_debugreg)(int regno); | |
37 | void (fastcall *set_debugreg)(int regno, unsigned long value); | |
38 | ||
39 | void (fastcall *clts)(void); | |
40 | ||
41 | unsigned long (fastcall *read_cr0)(void); | |
42 | void (fastcall *write_cr0)(unsigned long); | |
43 | ||
44 | unsigned long (fastcall *read_cr2)(void); | |
45 | void (fastcall *write_cr2)(unsigned long); | |
46 | ||
47 | unsigned long (fastcall *read_cr3)(void); | |
48 | void (fastcall *write_cr3)(unsigned long); | |
49 | ||
50 | unsigned long (fastcall *read_cr4_safe)(void); | |
51 | unsigned long (fastcall *read_cr4)(void); | |
52 | void (fastcall *write_cr4)(unsigned long); | |
53 | ||
54 | unsigned long (fastcall *save_fl)(void); | |
55 | void (fastcall *restore_fl)(unsigned long); | |
56 | void (fastcall *irq_disable)(void); | |
57 | void (fastcall *irq_enable)(void); | |
58 | void (fastcall *safe_halt)(void); | |
59 | void (fastcall *halt)(void); | |
60 | void (fastcall *wbinvd)(void); | |
61 | ||
62 | /* err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */ | |
63 | u64 (fastcall *read_msr)(unsigned int msr, int *err); | |
64 | int (fastcall *write_msr)(unsigned int msr, u64 val); | |
65 | ||
66 | u64 (fastcall *read_tsc)(void); | |
67 | u64 (fastcall *read_pmc)(void); | |
68 | ||
69 | void (fastcall *load_tr_desc)(void); | |
70 | void (fastcall *load_gdt)(const struct Xgt_desc_struct *); | |
71 | void (fastcall *load_idt)(const struct Xgt_desc_struct *); | |
72 | void (fastcall *store_gdt)(struct Xgt_desc_struct *); | |
73 | void (fastcall *store_idt)(struct Xgt_desc_struct *); | |
74 | void (fastcall *set_ldt)(const void *desc, unsigned entries); | |
75 | unsigned long (fastcall *store_tr)(void); | |
76 | void (fastcall *load_tls)(struct thread_struct *t, unsigned int cpu); | |
77 | void (fastcall *write_ldt_entry)(void *dt, int entrynum, | |
78 | u32 low, u32 high); | |
79 | void (fastcall *write_gdt_entry)(void *dt, int entrynum, | |
80 | u32 low, u32 high); | |
81 | void (fastcall *write_idt_entry)(void *dt, int entrynum, | |
82 | u32 low, u32 high); | |
83 | void (fastcall *load_esp0)(struct tss_struct *tss, | |
84 | struct thread_struct *thread); | |
85 | ||
86 | void (fastcall *set_iopl_mask)(unsigned mask); | |
87 | ||
88 | void (fastcall *io_delay)(void); | |
89 | void (*const_udelay)(unsigned long loops); | |
90 | ||
91 | /* These two are jmp to, not actually called. */ | |
92 | void (fastcall *irq_enable_sysexit)(void); | |
93 | void (fastcall *iret)(void); | |
94 | }; | |
95 | ||
96 | extern struct paravirt_ops paravirt_ops; | |
97 | ||
98 | #define paravirt_enabled() (paravirt_ops.paravirt_enabled) | |
99 | ||
100 | static inline void load_esp0(struct tss_struct *tss, | |
101 | struct thread_struct *thread) | |
102 | { | |
103 | paravirt_ops.load_esp0(tss, thread); | |
104 | } | |
105 | ||
106 | #define ARCH_SETUP paravirt_ops.arch_setup(); | |
107 | static inline unsigned long get_wallclock(void) | |
108 | { | |
109 | return paravirt_ops.get_wallclock(); | |
110 | } | |
111 | ||
112 | static inline int set_wallclock(unsigned long nowtime) | |
113 | { | |
114 | return paravirt_ops.set_wallclock(nowtime); | |
115 | } | |
116 | ||
117 | static inline void do_time_init(void) | |
118 | { | |
119 | return paravirt_ops.time_init(); | |
120 | } | |
121 | ||
122 | /* The paravirtualized CPUID instruction. */ | |
123 | static inline void __cpuid(unsigned int *eax, unsigned int *ebx, | |
124 | unsigned int *ecx, unsigned int *edx) | |
125 | { | |
126 | paravirt_ops.cpuid(eax, ebx, ecx, edx); | |
127 | } | |
128 | ||
129 | /* | |
130 | * These special macros can be used to get or set a debugging register | |
131 | */ | |
132 | #define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg) | |
133 | #define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val) | |
134 | ||
135 | #define clts() paravirt_ops.clts() | |
136 | ||
137 | #define read_cr0() paravirt_ops.read_cr0() | |
138 | #define write_cr0(x) paravirt_ops.write_cr0(x) | |
139 | ||
140 | #define read_cr2() paravirt_ops.read_cr2() | |
141 | #define write_cr2(x) paravirt_ops.write_cr2(x) | |
142 | ||
143 | #define read_cr3() paravirt_ops.read_cr3() | |
144 | #define write_cr3(x) paravirt_ops.write_cr3(x) | |
145 | ||
146 | #define read_cr4() paravirt_ops.read_cr4() | |
147 | #define read_cr4_safe(x) paravirt_ops.read_cr4_safe() | |
148 | #define write_cr4(x) paravirt_ops.write_cr4(x) | |
149 | ||
150 | static inline unsigned long __raw_local_save_flags(void) | |
151 | { | |
152 | return paravirt_ops.save_fl(); | |
153 | } | |
154 | ||
155 | static inline void raw_local_irq_restore(unsigned long flags) | |
156 | { | |
157 | return paravirt_ops.restore_fl(flags); | |
158 | } | |
159 | ||
160 | static inline void raw_local_irq_disable(void) | |
161 | { | |
162 | paravirt_ops.irq_disable(); | |
163 | } | |
164 | ||
165 | static inline void raw_local_irq_enable(void) | |
166 | { | |
167 | paravirt_ops.irq_enable(); | |
168 | } | |
169 | ||
170 | static inline unsigned long __raw_local_irq_save(void) | |
171 | { | |
172 | unsigned long flags = paravirt_ops.save_fl(); | |
173 | ||
174 | paravirt_ops.irq_disable(); | |
175 | ||
176 | return flags; | |
177 | } | |
178 | ||
179 | static inline void raw_safe_halt(void) | |
180 | { | |
181 | paravirt_ops.safe_halt(); | |
182 | } | |
183 | ||
184 | static inline void halt(void) | |
185 | { | |
186 | paravirt_ops.safe_halt(); | |
187 | } | |
188 | #define wbinvd() paravirt_ops.wbinvd() | |
189 | ||
190 | #define get_kernel_rpl() (paravirt_ops.kernel_rpl) | |
191 | ||
192 | #define rdmsr(msr,val1,val2) do { \ | |
193 | int _err; \ | |
194 | u64 _l = paravirt_ops.read_msr(msr,&_err); \ | |
195 | val1 = (u32)_l; \ | |
196 | val2 = _l >> 32; \ | |
197 | } while(0) | |
198 | ||
199 | #define wrmsr(msr,val1,val2) do { \ | |
200 | u64 _l = ((u64)(val2) << 32) | (val1); \ | |
201 | paravirt_ops.write_msr((msr), _l); \ | |
202 | } while(0) | |
203 | ||
204 | #define rdmsrl(msr,val) do { \ | |
205 | int _err; \ | |
206 | val = paravirt_ops.read_msr((msr),&_err); \ | |
207 | } while(0) | |
208 | ||
209 | #define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val))) | |
210 | #define wrmsr_safe(msr,a,b) ({ \ | |
211 | u64 _l = ((u64)(b) << 32) | (a); \ | |
212 | paravirt_ops.write_msr((msr),_l); \ | |
213 | }) | |
214 | ||
215 | /* rdmsr with exception handling */ | |
216 | #define rdmsr_safe(msr,a,b) ({ \ | |
217 | int _err; \ | |
218 | u64 _l = paravirt_ops.read_msr(msr,&_err); \ | |
219 | (*a) = (u32)_l; \ | |
220 | (*b) = _l >> 32; \ | |
221 | _err; }) | |
222 | ||
223 | #define rdtsc(low,high) do { \ | |
224 | u64 _l = paravirt_ops.read_tsc(); \ | |
225 | low = (u32)_l; \ | |
226 | high = _l >> 32; \ | |
227 | } while(0) | |
228 | ||
229 | #define rdtscl(low) do { \ | |
230 | u64 _l = paravirt_ops.read_tsc(); \ | |
231 | low = (int)_l; \ | |
232 | } while(0) | |
233 | ||
234 | #define rdtscll(val) (val = paravirt_ops.read_tsc()) | |
235 | ||
236 | #define write_tsc(val1,val2) wrmsr(0x10, val1, val2) | |
237 | ||
238 | #define rdpmc(counter,low,high) do { \ | |
239 | u64 _l = paravirt_ops.read_pmc(); \ | |
240 | low = (u32)_l; \ | |
241 | high = _l >> 32; \ | |
242 | } while(0) | |
243 | ||
244 | #define load_TR_desc() (paravirt_ops.load_tr_desc()) | |
245 | #define load_gdt(dtr) (paravirt_ops.load_gdt(dtr)) | |
246 | #define load_idt(dtr) (paravirt_ops.load_idt(dtr)) | |
247 | #define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries))) | |
248 | #define store_gdt(dtr) (paravirt_ops.store_gdt(dtr)) | |
249 | #define store_idt(dtr) (paravirt_ops.store_idt(dtr)) | |
250 | #define store_tr(tr) ((tr) = paravirt_ops.store_tr()) | |
251 | #define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu))) | |
252 | #define write_ldt_entry(dt, entry, low, high) \ | |
253 | (paravirt_ops.write_ldt_entry((dt), (entry), (low), (high))) | |
254 | #define write_gdt_entry(dt, entry, low, high) \ | |
255 | (paravirt_ops.write_gdt_entry((dt), (entry), (low), (high))) | |
256 | #define write_idt_entry(dt, entry, low, high) \ | |
257 | (paravirt_ops.write_idt_entry((dt), (entry), (low), (high))) | |
258 | #define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask)) | |
259 | ||
260 | /* The paravirtualized I/O functions */ | |
261 | static inline void slow_down_io(void) { | |
262 | paravirt_ops.io_delay(); | |
263 | #ifdef REALLY_SLOW_IO | |
264 | paravirt_ops.io_delay(); | |
265 | paravirt_ops.io_delay(); | |
266 | paravirt_ops.io_delay(); | |
267 | #endif | |
268 | } | |
269 | ||
270 | #define CLI_STRING "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax" | |
271 | #define STI_STRING "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax" | |
272 | #else /* __ASSEMBLY__ */ | |
273 | ||
274 | #define INTERRUPT_RETURN jmp *%cs:paravirt_ops+PARAVIRT_iret | |
275 | #define DISABLE_INTERRUPTS pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax | |
276 | #define ENABLE_INTERRUPTS pushl %eax; pushl %ecx; pushl %edx; call *%cs:paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax | |
277 | #define ENABLE_INTERRUPTS_SYSEXIT jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit | |
278 | #define GET_CR0_INTO_EAX call *paravirt_ops+PARAVIRT_read_cr0 | |
279 | #endif /* __ASSEMBLY__ */ | |
280 | #endif /* CONFIG_PARAVIRT */ | |
281 | #endif /* __ASM_PARAVIRT_H */ |