[mirror_ubuntu-artful-kernel.git] / include / asm-i386 / paravirt.h

#ifndef __ASM_PARAVIRT_H
#define __ASM_PARAVIRT_H
/* Various instructions on x86 need to be replaced for
 * para-virtualization: those hooks are defined here. */
#include <linux/linkage.h>

#ifdef CONFIG_PARAVIRT
#ifndef __ASSEMBLY__
struct thread_struct;
struct Xgt_desc_struct;
struct tss_struct;
struct paravirt_ops
{
	unsigned int kernel_rpl;
 	int paravirt_enabled;
	const char *name;

	void (*arch_setup)(void);
	char *(*memory_setup)(void);
	void (*init_IRQ)(void);

	void (*banner)(void);

	unsigned long (*get_wallclock)(void);
	int (*set_wallclock)(unsigned long);
	void (*time_init)(void);

	/* All the function pointers here are declared as "fastcall"
	   so that we get a specific register-based calling
	   convention.  This makes it easier to implement inline
	   assembler replacements. */

	void (fastcall *cpuid)(unsigned int *eax, unsigned int *ebx,
		      unsigned int *ecx, unsigned int *edx);

	unsigned long (fastcall *get_debugreg)(int regno);
	void (fastcall *set_debugreg)(int regno, unsigned long value);

	void (fastcall *clts)(void);

	unsigned long (fastcall *read_cr0)(void);
	void (fastcall *write_cr0)(unsigned long);

	unsigned long (fastcall *read_cr2)(void);
	void (fastcall *write_cr2)(unsigned long);

	unsigned long (fastcall *read_cr3)(void);
	void (fastcall *write_cr3)(unsigned long);

	unsigned long (fastcall *read_cr4_safe)(void);
	unsigned long (fastcall *read_cr4)(void);
	void (fastcall *write_cr4)(unsigned long);

	unsigned long (fastcall *save_fl)(void);
	void (fastcall *restore_fl)(unsigned long);
	void (fastcall *irq_disable)(void);
	void (fastcall *irq_enable)(void);
	void (fastcall *safe_halt)(void);
	void (fastcall *halt)(void);
	void (fastcall *wbinvd)(void);

	/* err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
	u64 (fastcall *read_msr)(unsigned int msr, int *err);
	int (fastcall *write_msr)(unsigned int msr, u64 val);

	u64 (fastcall *read_tsc)(void);
	u64 (fastcall *read_pmc)(void);

	void (fastcall *load_tr_desc)(void);
	void (fastcall *load_gdt)(const struct Xgt_desc_struct *);
	void (fastcall *load_idt)(const struct Xgt_desc_struct *);
	void (fastcall *store_gdt)(struct Xgt_desc_struct *);
	void (fastcall *store_idt)(struct Xgt_desc_struct *);
	void (fastcall *set_ldt)(const void *desc, unsigned entries);
	unsigned long (fastcall *store_tr)(void);
	void (fastcall *load_tls)(struct thread_struct *t, unsigned int cpu);
	void (fastcall *write_ldt_entry)(void *dt, int entrynum,
					 u32 low, u32 high);
	void (fastcall *write_gdt_entry)(void *dt, int entrynum,
					 u32 low, u32 high);
	void (fastcall *write_idt_entry)(void *dt, int entrynum,
					 u32 low, u32 high);
	void (fastcall *load_esp0)(struct tss_struct *tss,
				   struct thread_struct *thread);

	void (fastcall *set_iopl_mask)(unsigned mask);

	void (fastcall *io_delay)(void);
	void (*const_udelay)(unsigned long loops);

	/* These two are jmp to, not actually called. */
	void (fastcall *irq_enable_sysexit)(void);
	void (fastcall *iret)(void);
};

extern struct paravirt_ops paravirt_ops;

#define paravirt_enabled() (paravirt_ops.paravirt_enabled)

static inline void load_esp0(struct tss_struct *tss,
			     struct thread_struct *thread)
{
	paravirt_ops.load_esp0(tss, thread);
}

#define ARCH_SETUP			paravirt_ops.arch_setup();
static inline unsigned long get_wallclock(void)
{
	return paravirt_ops.get_wallclock();
}

static inline int set_wallclock(unsigned long nowtime)
{
	return paravirt_ops.set_wallclock(nowtime);
}

static inline void do_time_init(void)
{
	return paravirt_ops.time_init();
}

/* The paravirtualized CPUID instruction. */
static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
			   unsigned int *ecx, unsigned int *edx)
{
	paravirt_ops.cpuid(eax, ebx, ecx, edx);
}

/*
 * These special macros can be used to get or set a debugging register
 */
#define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg)
#define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val)

#define clts() paravirt_ops.clts()

#define read_cr0() paravirt_ops.read_cr0()
#define write_cr0(x) paravirt_ops.write_cr0(x)

#define read_cr2() paravirt_ops.read_cr2()
#define write_cr2(x) paravirt_ops.write_cr2(x)

#define read_cr3() paravirt_ops.read_cr3()
#define write_cr3(x) paravirt_ops.write_cr3(x)

#define read_cr4() paravirt_ops.read_cr4()
#define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
#define write_cr4(x) paravirt_ops.write_cr4(x)

static inline unsigned long __raw_local_save_flags(void)
{
	return paravirt_ops.save_fl();
}

static inline void raw_local_irq_restore(unsigned long flags)
{
	return paravirt_ops.restore_fl(flags);
}

static inline void raw_local_irq_disable(void)
{
	paravirt_ops.irq_disable();
}

static inline void raw_local_irq_enable(void)
{
	paravirt_ops.irq_enable();
}

static inline unsigned long __raw_local_irq_save(void)
{
	unsigned long flags = paravirt_ops.save_fl();

	paravirt_ops.irq_disable();

	return flags;
}

static inline void raw_safe_halt(void)
{
	paravirt_ops.safe_halt();
}

static inline void halt(void)
{
	paravirt_ops.safe_halt();
}
#define wbinvd() paravirt_ops.wbinvd()

#define get_kernel_rpl()  (paravirt_ops.kernel_rpl)

#define rdmsr(msr,val1,val2) do {				\
	int _err;						\
	u64 _l = paravirt_ops.read_msr(msr,&_err);		\
	val1 = (u32)_l;						\
	val2 = _l >> 32;					\
} while(0)

#define wrmsr(msr,val1,val2) do {				\
	u64 _l = ((u64)(val2) << 32) | (val1);			\
	paravirt_ops.write_msr((msr), _l);			\
} while(0)

#define rdmsrl(msr,val) do {					\
	int _err;						\
	val = paravirt_ops.read_msr((msr),&_err);		\
} while(0)

#define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val)))
#define wrmsr_safe(msr,a,b) ({					\
	u64 _l = ((u64)(b) << 32) | (a);			\
	paravirt_ops.write_msr((msr),_l);			\
})

/* rdmsr with exception handling */
#define rdmsr_safe(msr,a,b) ({					\
	int _err;						\
	u64 _l = paravirt_ops.read_msr(msr,&_err);		\
	(*a) = (u32)_l;						\
	(*b) = _l >> 32;					\
	_err; })

#define rdtsc(low,high) do {					\
	u64 _l = paravirt_ops.read_tsc();			\
	low = (u32)_l;						\
	high = _l >> 32;					\
} while(0)

#define rdtscl(low) do {					\
	u64 _l = paravirt_ops.read_tsc();			\
	low = (int)_l;						\
} while(0)

#define rdtscll(val) (val = paravirt_ops.read_tsc())

#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)

#define rdpmc(counter,low,high) do {				\
	u64 _l = paravirt_ops.read_pmc();			\
	low = (u32)_l;						\
	high = _l >> 32;					\
} while(0)

#define load_TR_desc() (paravirt_ops.load_tr_desc())
#define load_gdt(dtr) (paravirt_ops.load_gdt(dtr))
#define load_idt(dtr) (paravirt_ops.load_idt(dtr))
#define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries)))
#define store_gdt(dtr) (paravirt_ops.store_gdt(dtr))
#define store_idt(dtr) (paravirt_ops.store_idt(dtr))
#define store_tr(tr) ((tr) = paravirt_ops.store_tr())
#define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu)))
#define write_ldt_entry(dt, entry, low, high)				\
	(paravirt_ops.write_ldt_entry((dt), (entry), (low), (high)))
#define write_gdt_entry(dt, entry, low, high)				\
	(paravirt_ops.write_gdt_entry((dt), (entry), (low), (high)))
#define write_idt_entry(dt, entry, low, high)				\
	(paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
#define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))

/* The paravirtualized I/O functions */
static inline void slow_down_io(void) {
	paravirt_ops.io_delay();
#ifdef REALLY_SLOW_IO
	paravirt_ops.io_delay();
	paravirt_ops.io_delay();
	paravirt_ops.io_delay();
#endif
}

#define CLI_STRING	"pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax"
#define STI_STRING	"pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax"
#else  /* __ASSEMBLY__ */

#define INTERRUPT_RETURN	jmp *%cs:paravirt_ops+PARAVIRT_iret
#define DISABLE_INTERRUPTS	pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax
#define ENABLE_INTERRUPTS	pushl %eax; pushl %ecx; pushl %edx; call *%cs:paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax
#define ENABLE_INTERRUPTS_SYSEXIT	jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit
#define GET_CR0_INTO_EAX	call *paravirt_ops+PARAVIRT_read_cr0
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PARAVIRT */
#endif	/* __ASM_PARAVIRT_H */
Commit	Line	Data
d3561b7f RR	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 */