[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / xen / hypercall.h

/******************************************************************************
 * hypercall.h
 *
 * Linux-specific hypervisor handling.
 *
 * Copyright (c) 2002-2004, K A Fraser
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef _ASM_X86_XEN_HYPERCALL_H
#define _ASM_X86_XEN_HYPERCALL_H

#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>

#include <trace/events/xen.h>

#include <asm/page.h>
#include <asm/pgtable.h>

#include <xen/interface/xen.h>
#include <xen/interface/sched.h>
#include <xen/interface/physdev.h>
#include <xen/interface/platform.h>
#include <xen/interface/xen-mca.h>

/*
 * The hypercall asms have to meet several constraints:
 * - Work on 32- and 64-bit.
 *    The two architectures put their arguments in different sets of
 *    registers.
 *
 * - Work around asm syntax quirks
 *    It isn't possible to specify one of the rNN registers in a
 *    constraint, so we use explicit register variables to get the
 *    args into the right place.
 *
 * - Mark all registers as potentially clobbered
 *    Even unused parameters can be clobbered by the hypervisor, so we
 *    need to make sure gcc knows it.
 *
 * - Avoid compiler bugs.
 *    This is the tricky part.  Because x86_32 has such a constrained
 *    register set, gcc versions below 4.3 have trouble generating
 *    code when all the arg registers and memory are trashed by the
 *    asm.  There are syntactically simpler ways of achieving the
 *    semantics below, but they cause the compiler to crash.
 *
 *    The only combination I found which works is:
 *     - assign the __argX variables first
 *     - list all actually used parameters as "+r" (__argX)
 *     - clobber the rest
 *
 * The result certainly isn't pretty, and it really shows up cpp's
 * weakness as as macro language.  Sorry.  (But let's just give thanks
 * there aren't more than 5 arguments...)
 */

extern struct { char _entry[32]; } hypercall_page[];

#define __HYPERCALL		"call hypercall_page+%c[offset]"
#define __HYPERCALL_ENTRY(x)						\
	[offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))

#ifdef CONFIG_X86_32
#define __HYPERCALL_RETREG	"eax"
#define __HYPERCALL_ARG1REG	"ebx"
#define __HYPERCALL_ARG2REG	"ecx"
#define __HYPERCALL_ARG3REG	"edx"
#define __HYPERCALL_ARG4REG	"esi"
#define __HYPERCALL_ARG5REG	"edi"
#else
#define __HYPERCALL_RETREG	"rax"
#define __HYPERCALL_ARG1REG	"rdi"
#define __HYPERCALL_ARG2REG	"rsi"
#define __HYPERCALL_ARG3REG	"rdx"
#define __HYPERCALL_ARG4REG	"r10"
#define __HYPERCALL_ARG5REG	"r8"
#endif

#define __HYPERCALL_DECLS						\
	register unsigned long __res  asm(__HYPERCALL_RETREG);		\
	register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
	register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
	register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
	register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
	register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;

#define __HYPERCALL_0PARAM	"=r" (__res)
#define __HYPERCALL_1PARAM	__HYPERCALL_0PARAM, "+r" (__arg1)
#define __HYPERCALL_2PARAM	__HYPERCALL_1PARAM, "+r" (__arg2)
#define __HYPERCALL_3PARAM	__HYPERCALL_2PARAM, "+r" (__arg3)
#define __HYPERCALL_4PARAM	__HYPERCALL_3PARAM, "+r" (__arg4)
#define __HYPERCALL_5PARAM	__HYPERCALL_4PARAM, "+r" (__arg5)

#define __HYPERCALL_0ARG()
#define __HYPERCALL_1ARG(a1)						\
	__HYPERCALL_0ARG()		__arg1 = (unsigned long)(a1);
#define __HYPERCALL_2ARG(a1,a2)						\
	__HYPERCALL_1ARG(a1)		__arg2 = (unsigned long)(a2);
#define __HYPERCALL_3ARG(a1,a2,a3)					\
	__HYPERCALL_2ARG(a1,a2)		__arg3 = (unsigned long)(a3);
#define __HYPERCALL_4ARG(a1,a2,a3,a4)					\
	__HYPERCALL_3ARG(a1,a2,a3)	__arg4 = (unsigned long)(a4);
#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)				\
	__HYPERCALL_4ARG(a1,a2,a3,a4)	__arg5 = (unsigned long)(a5);

#define __HYPERCALL_CLOBBER5	"memory"
#define __HYPERCALL_CLOBBER4	__HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
#define __HYPERCALL_CLOBBER3	__HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
#define __HYPERCALL_CLOBBER2	__HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
#define __HYPERCALL_CLOBBER1	__HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
#define __HYPERCALL_CLOBBER0	__HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG

#define _hypercall0(type, name)						\
({									\
	__HYPERCALL_DECLS;						\
	__HYPERCALL_0ARG();						\
	asm volatile (__HYPERCALL					\
		      : __HYPERCALL_0PARAM				\
		      : __HYPERCALL_ENTRY(name)				\
		      : __HYPERCALL_CLOBBER0);				\
	(type)__res;							\
})

#define _hypercall1(type, name, a1)					\
({									\
	__HYPERCALL_DECLS;						\
	__HYPERCALL_1ARG(a1);						\
	asm volatile (__HYPERCALL					\
		      : __HYPERCALL_1PARAM				\
		      : __HYPERCALL_ENTRY(name)				\
		      : __HYPERCALL_CLOBBER1);				\
	(type)__res;							\
})

#define _hypercall2(type, name, a1, a2)					\
({									\
	__HYPERCALL_DECLS;						\
	__HYPERCALL_2ARG(a1, a2);					\
	asm volatile (__HYPERCALL					\
		      : __HYPERCALL_2PARAM				\
		      : __HYPERCALL_ENTRY(name)				\
		      : __HYPERCALL_CLOBBER2);				\
	(type)__res;							\
})

#define _hypercall3(type, name, a1, a2, a3)				\
({									\
	__HYPERCALL_DECLS;						\
	__HYPERCALL_3ARG(a1, a2, a3);					\
	asm volatile (__HYPERCALL					\
		      : __HYPERCALL_3PARAM				\
		      : __HYPERCALL_ENTRY(name)				\
		      : __HYPERCALL_CLOBBER3);				\
	(type)__res;							\
})

#define _hypercall4(type, name, a1, a2, a3, a4)				\
({									\
	__HYPERCALL_DECLS;						\
	__HYPERCALL_4ARG(a1, a2, a3, a4);				\
	asm volatile (__HYPERCALL					\
		      : __HYPERCALL_4PARAM				\
		      : __HYPERCALL_ENTRY(name)				\
		      : __HYPERCALL_CLOBBER4);				\
	(type)__res;							\
})

#define _hypercall5(type, name, a1, a2, a3, a4, a5)			\
({									\
	__HYPERCALL_DECLS;						\
	__HYPERCALL_5ARG(a1, a2, a3, a4, a5);				\
	asm volatile (__HYPERCALL					\
		      : __HYPERCALL_5PARAM				\
		      : __HYPERCALL_ENTRY(name)				\
		      : __HYPERCALL_CLOBBER5);				\
	(type)__res;							\
})

static inline long
privcmd_call(unsigned call,
	     unsigned long a1, unsigned long a2,
	     unsigned long a3, unsigned long a4,
	     unsigned long a5)
{
	__HYPERCALL_DECLS;
	__HYPERCALL_5ARG(a1, a2, a3, a4, a5);

	asm volatile("call *%[call]"
		     : __HYPERCALL_5PARAM
		     : [call] "a" (&hypercall_page[call])
		     : __HYPERCALL_CLOBBER5);

	return (long)__res;
}

static inline int
HYPERVISOR_set_trap_table(struct trap_info *table)
{
	return _hypercall1(int, set_trap_table, table);
}

static inline int
HYPERVISOR_mmu_update(struct mmu_update *req, int count,
		      int *success_count, domid_t domid)
{
	return _hypercall4(int, mmu_update, req, count, success_count, domid);
}

static inline int
HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
		     int *success_count, domid_t domid)
{
	return _hypercall4(int, mmuext_op, op, count, success_count, domid);
}

static inline int
HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
{
	return _hypercall2(int, set_gdt, frame_list, entries);
}

static inline int
HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
{
	return _hypercall2(int, stack_switch, ss, esp);
}

#ifdef CONFIG_X86_32
static inline int
HYPERVISOR_set_callbacks(unsigned long event_selector,
			 unsigned long event_address,
			 unsigned long failsafe_selector,
			 unsigned long failsafe_address)
{
	return _hypercall4(int, set_callbacks,
			   event_selector, event_address,
			   failsafe_selector, failsafe_address);
}
#else  /* CONFIG_X86_64 */
static inline int
HYPERVISOR_set_callbacks(unsigned long event_address,
			unsigned long failsafe_address,
			unsigned long syscall_address)
{
	return _hypercall3(int, set_callbacks,
			   event_address, failsafe_address,
			   syscall_address);
}
#endif  /* CONFIG_X86_{32,64} */

static inline int
HYPERVISOR_callback_op(int cmd, void *arg)
{
	return _hypercall2(int, callback_op, cmd, arg);
}

static inline int
HYPERVISOR_fpu_taskswitch(int set)
{
	return _hypercall1(int, fpu_taskswitch, set);
}

static inline int
HYPERVISOR_sched_op(int cmd, void *arg)
{
	return _hypercall2(int, sched_op, cmd, arg);
}

static inline long
HYPERVISOR_set_timer_op(u64 timeout)
{
	unsigned long timeout_hi = (unsigned long)(timeout>>32);
	unsigned long timeout_lo = (unsigned long)timeout;
	return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
}

static inline int
HYPERVISOR_mca(struct xen_mc *mc_op)
{
	mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
	return _hypercall1(int, mca, mc_op);
}

static inline int
HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
{
	platform_op->interface_version = XENPF_INTERFACE_VERSION;
	return _hypercall1(int, dom0_op, platform_op);
}

static inline int
HYPERVISOR_set_debugreg(int reg, unsigned long value)
{
	return _hypercall2(int, set_debugreg, reg, value);
}

static inline unsigned long
HYPERVISOR_get_debugreg(int reg)
{
	return _hypercall1(unsigned long, get_debugreg, reg);
}

static inline int
HYPERVISOR_update_descriptor(u64 ma, u64 desc)
{
	if (sizeof(u64) == sizeof(long))
		return _hypercall2(int, update_descriptor, ma, desc);
	return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
}

static inline int
HYPERVISOR_memory_op(unsigned int cmd, void *arg)
{
	return _hypercall2(int, memory_op, cmd, arg);
}

static inline int
HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
{
	return _hypercall2(int, multicall, call_list, nr_calls);
}

static inline int
HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
			     unsigned long flags)
{
	if (sizeof(new_val) == sizeof(long))
		return _hypercall3(int, update_va_mapping, va,
				   new_val.pte, flags);
	else
		return _hypercall4(int, update_va_mapping, va,
				   new_val.pte, new_val.pte >> 32, flags);
}
extern int __must_check xen_event_channel_op_compat(int, void *);

static inline int
HYPERVISOR_event_channel_op(int cmd, void *arg)
{
	int rc = _hypercall2(int, event_channel_op, cmd, arg);
	if (unlikely(rc == -ENOSYS))
		rc = xen_event_channel_op_compat(cmd, arg);
	return rc;
}

static inline int
HYPERVISOR_xen_version(int cmd, void *arg)
{
	return _hypercall2(int, xen_version, cmd, arg);
}

static inline int
HYPERVISOR_console_io(int cmd, int count, char *str)
{
	return _hypercall3(int, console_io, cmd, count, str);
}

extern int __must_check xen_physdev_op_compat(int, void *);

static inline int
HYPERVISOR_physdev_op(int cmd, void *arg)
{
	int rc = _hypercall2(int, physdev_op, cmd, arg);
	if (unlikely(rc == -ENOSYS))
		rc = xen_physdev_op_compat(cmd, arg);
	return rc;
}

static inline int
HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
{
	return _hypercall3(int, grant_table_op, cmd, uop, count);
}

static inline int
HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
					 unsigned long flags, domid_t domid)
{
	if (sizeof(new_val) == sizeof(long))
		return _hypercall4(int, update_va_mapping_otherdomain, va,
				   new_val.pte, flags, domid);
	else
		return _hypercall5(int, update_va_mapping_otherdomain, va,
				   new_val.pte, new_val.pte >> 32,
				   flags, domid);
}

static inline int
HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
{
	return _hypercall2(int, vm_assist, cmd, type);
}

static inline int
HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
{
	return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
}

#ifdef CONFIG_X86_64
static inline int
HYPERVISOR_set_segment_base(int reg, unsigned long value)
{
	return _hypercall2(int, set_segment_base, reg, value);
}
#endif

static inline int
HYPERVISOR_suspend(unsigned long start_info_mfn)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_suspend };

	/*
	 * For a PV guest the tools require that the start_info mfn be
	 * present in rdx/edx when the hypercall is made. Per the
	 * hypercall calling convention this is the third hypercall
	 * argument, which is start_info_mfn here.
	 */
	return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
}

static inline int
HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
{
	return _hypercall2(int, nmi_op, op, arg);
}

static inline unsigned long __must_check
HYPERVISOR_hvm_op(int op, void *arg)
{
       return _hypercall2(unsigned long, hvm_op, op, arg);
}

static inline int
HYPERVISOR_tmem_op(
	struct tmem_op *op)
{
	return _hypercall1(int, tmem_op, op);
}

static inline int
HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
{
	return _hypercall2(int, xenpmu_op, op, arg);
}

static inline void
MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
{
	mcl->op = __HYPERVISOR_fpu_taskswitch;
	mcl->args[0] = set;

	trace_xen_mc_entry(mcl, 1);
}

static inline void
MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
			pte_t new_val, unsigned long flags)
{
	mcl->op = __HYPERVISOR_update_va_mapping;
	mcl->args[0] = va;
	if (sizeof(new_val) == sizeof(long)) {
		mcl->args[1] = new_val.pte;
		mcl->args[2] = flags;
	} else {
		mcl->args[1] = new_val.pte;
		mcl->args[2] = new_val.pte >> 32;
		mcl->args[3] = flags;
	}

	trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
}

static inline void
MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
		     void *uop, unsigned int count)
{
	mcl->op = __HYPERVISOR_grant_table_op;
	mcl->args[0] = cmd;
	mcl->args[1] = (unsigned long)uop;
	mcl->args[2] = count;

	trace_xen_mc_entry(mcl, 3);
}

static inline void
MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
				    pte_t new_val, unsigned long flags,
				    domid_t domid)
{
	mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
	mcl->args[0] = va;
	if (sizeof(new_val) == sizeof(long)) {
		mcl->args[1] = new_val.pte;
		mcl->args[2] = flags;
		mcl->args[3] = domid;
	} else {
		mcl->args[1] = new_val.pte;
		mcl->args[2] = new_val.pte >> 32;
		mcl->args[3] = flags;
		mcl->args[4] = domid;
	}

	trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
}

static inline void
MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
			struct desc_struct desc)
{
	mcl->op = __HYPERVISOR_update_descriptor;
	if (sizeof(maddr) == sizeof(long)) {
		mcl->args[0] = maddr;
		mcl->args[1] = *(unsigned long *)&desc;
	} else {
		mcl->args[0] = maddr;
		mcl->args[1] = maddr >> 32;
		mcl->args[2] = desc.a;
		mcl->args[3] = desc.b;
	}

	trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
}

static inline void
MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
{
	mcl->op = __HYPERVISOR_memory_op;
	mcl->args[0] = cmd;
	mcl->args[1] = (unsigned long)arg;

	trace_xen_mc_entry(mcl, 2);
}

static inline void
MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
		 int count, int *success_count, domid_t domid)
{
	mcl->op = __HYPERVISOR_mmu_update;
	mcl->args[0] = (unsigned long)req;
	mcl->args[1] = count;
	mcl->args[2] = (unsigned long)success_count;
	mcl->args[3] = domid;

	trace_xen_mc_entry(mcl, 4);
}

static inline void
MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
		int *success_count, domid_t domid)
{
	mcl->op = __HYPERVISOR_mmuext_op;
	mcl->args[0] = (unsigned long)op;
	mcl->args[1] = count;
	mcl->args[2] = (unsigned long)success_count;
	mcl->args[3] = domid;

	trace_xen_mc_entry(mcl, 4);
}

static inline void
MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
{
	mcl->op = __HYPERVISOR_set_gdt;
	mcl->args[0] = (unsigned long)frames;
	mcl->args[1] = entries;

	trace_xen_mc_entry(mcl, 2);
}

static inline void
MULTI_stack_switch(struct multicall_entry *mcl,
		   unsigned long ss, unsigned long esp)
{
	mcl->op = __HYPERVISOR_stack_switch;
	mcl->args[0] = ss;
	mcl->args[1] = esp;

	trace_xen_mc_entry(mcl, 2);
}

#endif /* _ASM_X86_XEN_HYPERCALL_H */
Commit	Line	Data
a42089dd JF	1	/******************************************************************************
	2	* hypercall.h
	3	*
	4	* Linux-specific hypervisor handling.
	5	*
	6	* Copyright (c) 2002-2004, K A Fraser
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License version 2
	10	* as published by the Free Software Foundation; or, when distributed
	11	* separately from the Linux kernel or incorporated into other
	12	* software packages, subject to the following license:
	13	*
	14	* Permission is hereby granted, free of charge, to any person obtaining a copy
	15	* of this source file (the "Software"), to deal in the Software without
	16	* restriction, including without limitation the rights to use, copy, modify,
	17	* merge, publish, distribute, sublicense, and/or sell copies of the Software,
	18	* and to permit persons to whom the Software is furnished to do so, subject to
	19	* the following conditions:
	20	*
	21	* The above copyright notice and this permission notice shall be included in
	22	* all copies or substantial portions of the Software.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	25	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	26	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	27	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	28	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	29	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	30	* IN THE SOFTWARE.
	31	*/
	32
05e4d316 PA	33	#ifndef _ASM_X86_XEN_HYPERCALL_H
05e4d316 PA	34	#define _ASM_X86_XEN_HYPERCALL_H
a42089dd	35
ecbf29cd JF	36	#include <linux/kernel.h>
ecbf29cd JF	37	#include <linux/spinlock.h>
a42089dd JF	38	#include <linux/errno.h>
a42089dd JF	39	#include <linux/string.h>
ecbf29cd JF	40	#include <linux/types.h>
ecbf29cd JF	41
c796f213 JF	42	#include <trace/events/xen.h>
c796f213 JF	43
ecbf29cd JF	44	#include <asm/page.h>
ecbf29cd JF	45	#include <asm/pgtable.h>
a42089dd JF	46
	47	#include <xen/interface/xen.h>
	48	#include <xen/interface/sched.h>
	49	#include <xen/interface/physdev.h>
eec07a9e	50	#include <xen/interface/platform.h>
cef12ee5	51	#include <xen/interface/xen-mca.h>
a42089dd	52
e7435902 JF	53	/*
	54	* The hypercall asms have to meet several constraints:
	55	* - Work on 32- and 64-bit.
	56	* The two architectures put their arguments in different sets of
	57	* registers.
	58	*
	59	* - Work around asm syntax quirks
	60	* It isn't possible to specify one of the rNN registers in a
	61	* constraint, so we use explicit register variables to get the
	62	* args into the right place.
	63	*
	64	* - Mark all registers as potentially clobbered
	65	* Even unused parameters can be clobbered by the hypervisor, so we
	66	* need to make sure gcc knows it.
	67	*
	68	* - Avoid compiler bugs.
	69	* This is the tricky part. Because x86_32 has such a constrained
	70	* register set, gcc versions below 4.3 have trouble generating
	71	* code when all the arg registers and memory are trashed by the
	72	* asm. There are syntactically simpler ways of achieving the
	73	* semantics below, but they cause the compiler to crash.
	74	*
	75	* The only combination I found which works is:
	76	* - assign the __argX variables first
	77	* - list all actually used parameters as "+r" (__argX)
	78	* - clobber the rest
	79	*
	80	* The result certainly isn't pretty, and it really shows up cpp's
	81	* weakness as as macro language. Sorry. (But let's just give thanks
	82	* there aren't more than 5 arguments...)
	83	*/
	84
a42089dd JF	85	extern struct { char _entry[32]; } hypercall_page[];
a42089dd JF	86
e7435902 JF	87	#define __HYPERCALL "call hypercall_page+%c[offset]"
	88	#define __HYPERCALL_ENTRY(x) \
	89	[offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
	90
	91	#ifdef CONFIG_X86_32
	92	#define __HYPERCALL_RETREG "eax"
	93	#define __HYPERCALL_ARG1REG "ebx"
	94	#define __HYPERCALL_ARG2REG "ecx"
	95	#define __HYPERCALL_ARG3REG "edx"
	96	#define __HYPERCALL_ARG4REG "esi"
	97	#define __HYPERCALL_ARG5REG "edi"
	98	#else
	99	#define __HYPERCALL_RETREG "rax"
	100	#define __HYPERCALL_ARG1REG "rdi"
	101	#define __HYPERCALL_ARG2REG "rsi"
	102	#define __HYPERCALL_ARG3REG "rdx"
	103	#define __HYPERCALL_ARG4REG "r10"
	104	#define __HYPERCALL_ARG5REG "r8"
	105	#endif
	106
	107	#define __HYPERCALL_DECLS \
	108	register unsigned long __res asm(__HYPERCALL_RETREG); \
	109	register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
	110	register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
	111	register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
	112	register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
	113	register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
	114
	115	#define __HYPERCALL_0PARAM "=r" (__res)
	116	#define __HYPERCALL_1PARAM __HYPERCALL_0PARAM, "+r" (__arg1)
	117	#define __HYPERCALL_2PARAM __HYPERCALL_1PARAM, "+r" (__arg2)
	118	#define __HYPERCALL_3PARAM __HYPERCALL_2PARAM, "+r" (__arg3)
	119	#define __HYPERCALL_4PARAM __HYPERCALL_3PARAM, "+r" (__arg4)
	120	#define __HYPERCALL_5PARAM __HYPERCALL_4PARAM, "+r" (__arg5)
	121
	122	#define __HYPERCALL_0ARG()
	123	#define __HYPERCALL_1ARG(a1) \
	124	__HYPERCALL_0ARG() __arg1 = (unsigned long)(a1);
	125	#define __HYPERCALL_2ARG(a1,a2) \
	126	__HYPERCALL_1ARG(a1) __arg2 = (unsigned long)(a2);
	127	#define __HYPERCALL_3ARG(a1,a2,a3) \
	128	__HYPERCALL_2ARG(a1,a2) __arg3 = (unsigned long)(a3);
	129	#define __HYPERCALL_4ARG(a1,a2,a3,a4) \
	130	__HYPERCALL_3ARG(a1,a2,a3) __arg4 = (unsigned long)(a4);
	131	#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) \
	132	__HYPERCALL_4ARG(a1,a2,a3,a4) __arg5 = (unsigned long)(a5);
	133
	134	#define __HYPERCALL_CLOBBER5 "memory"
	135	#define __HYPERCALL_CLOBBER4 __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
	136	#define __HYPERCALL_CLOBBER3 __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
	137	#define __HYPERCALL_CLOBBER2 __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
	138	#define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
	139	#define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
	140
a42089dd JF	141	#define _hypercall0(type, name) \
a42089dd JF	142	({ \
e7435902 JF	143	__HYPERCALL_DECLS; \
	144	__HYPERCALL_0ARG(); \
	145	asm volatile (__HYPERCALL \
	146	: __HYPERCALL_0PARAM \
	147	: __HYPERCALL_ENTRY(name) \
	148	: __HYPERCALL_CLOBBER0); \
a42089dd JF	149	(type)__res; \
	150	})
	151
	152	#define _hypercall1(type, name, a1) \
	153	({ \
e7435902 JF	154	__HYPERCALL_DECLS; \
	155	__HYPERCALL_1ARG(a1); \
	156	asm volatile (__HYPERCALL \
	157	: __HYPERCALL_1PARAM \
	158	: __HYPERCALL_ENTRY(name) \
	159	: __HYPERCALL_CLOBBER1); \
a42089dd JF	160	(type)__res; \
	161	})
	162
	163	#define _hypercall2(type, name, a1, a2) \
	164	({ \
e7435902 JF	165	__HYPERCALL_DECLS; \
	166	__HYPERCALL_2ARG(a1, a2); \
	167	asm volatile (__HYPERCALL \
	168	: __HYPERCALL_2PARAM \
	169	: __HYPERCALL_ENTRY(name) \
	170	: __HYPERCALL_CLOBBER2); \
a42089dd JF	171	(type)__res; \
	172	})
	173
	174	#define _hypercall3(type, name, a1, a2, a3) \
	175	({ \
e7435902 JF	176	__HYPERCALL_DECLS; \
	177	__HYPERCALL_3ARG(a1, a2, a3); \
	178	asm volatile (__HYPERCALL \
	179	: __HYPERCALL_3PARAM \
	180	: __HYPERCALL_ENTRY(name) \
	181	: __HYPERCALL_CLOBBER3); \
a42089dd JF	182	(type)__res; \
	183	})
	184
	185	#define _hypercall4(type, name, a1, a2, a3, a4) \
	186	({ \
e7435902 JF	187	__HYPERCALL_DECLS; \
	188	__HYPERCALL_4ARG(a1, a2, a3, a4); \
	189	asm volatile (__HYPERCALL \
	190	: __HYPERCALL_4PARAM \
	191	: __HYPERCALL_ENTRY(name) \
	192	: __HYPERCALL_CLOBBER4); \
a42089dd JF	193	(type)__res; \
	194	})
	195
	196	#define _hypercall5(type, name, a1, a2, a3, a4, a5) \
	197	({ \
e7435902 JF	198	__HYPERCALL_DECLS; \
	199	__HYPERCALL_5ARG(a1, a2, a3, a4, a5); \
	200	asm volatile (__HYPERCALL \
	201	: __HYPERCALL_5PARAM \
	202	: __HYPERCALL_ENTRY(name) \
	203	: __HYPERCALL_CLOBBER5); \
a42089dd JF	204	(type)__res; \
	205	})
	206
1246ae0b JF	207	static inline long
	208	privcmd_call(unsigned call,
	209	unsigned long a1, unsigned long a2,
	210	unsigned long a3, unsigned long a4,
	211	unsigned long a5)
	212	{
	213	__HYPERCALL_DECLS;
	214	__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
	215
	216	asm volatile("call *%[call]"
	217	: __HYPERCALL_5PARAM
	218	: [call] "a" (&hypercall_page[call])
	219	: __HYPERCALL_CLOBBER5);
	220
	221	return (long)__res;
	222	}
	223
a42089dd JF	224	static inline int
	225	HYPERVISOR_set_trap_table(struct trap_info *table)
	226	{
	227	return _hypercall1(int, set_trap_table, table);
	228	}
	229
	230	static inline int
	231	HYPERVISOR_mmu_update(struct mmu_update *req, int count,
	232	int *success_count, domid_t domid)
	233	{
	234	return _hypercall4(int, mmu_update, req, count, success_count, domid);
	235	}
	236
	237	static inline int
	238	HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
	239	int *success_count, domid_t domid)
	240	{
	241	return _hypercall4(int, mmuext_op, op, count, success_count, domid);
	242	}
	243
	244	static inline int
	245	HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
	246	{
	247	return _hypercall2(int, set_gdt, frame_list, entries);
	248	}
	249
	250	static inline int
	251	HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
	252	{
	253	return _hypercall2(int, stack_switch, ss, esp);
	254	}
	255
88459d4c	256	#ifdef CONFIG_X86_32
a42089dd JF	257	static inline int
	258	HYPERVISOR_set_callbacks(unsigned long event_selector,
	259	unsigned long event_address,
	260	unsigned long failsafe_selector,
	261	unsigned long failsafe_address)
	262	{
	263	return _hypercall4(int, set_callbacks,
	264	event_selector, event_address,
	265	failsafe_selector, failsafe_address);
	266	}
88459d4c JF	267	#else /* CONFIG_X86_64 */
	268	static inline int
	269	HYPERVISOR_set_callbacks(unsigned long event_address,
	270	unsigned long failsafe_address,
	271	unsigned long syscall_address)
	272	{
	273	return _hypercall3(int, set_callbacks,
	274	event_address, failsafe_address,
	275	syscall_address);
	276	}
	277	#endif /* CONFIG_X86_{32,64} */
a42089dd	278
aa380c82 JF	279	static inline int
	280	HYPERVISOR_callback_op(int cmd, void *arg)
	281	{
	282	return _hypercall2(int, callback_op, cmd, arg);
	283	}
	284
a42089dd JF	285	static inline int
	286	HYPERVISOR_fpu_taskswitch(int set)
	287	{
	288	return _hypercall1(int, fpu_taskswitch, set);
	289	}
	290
	291	static inline int
349c709f	292	HYPERVISOR_sched_op(int cmd, void *arg)
a42089dd	293	{
a8b74583	294	return _hypercall2(int, sched_op, cmd, arg);
a42089dd JF	295	}
	296
	297	static inline long
	298	HYPERVISOR_set_timer_op(u64 timeout)
	299	{
	300	unsigned long timeout_hi = (unsigned long)(timeout>>32);
	301	unsigned long timeout_lo = (unsigned long)timeout;
	302	return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
	303	}
	304
cef12ee5 LJ	305	static inline int
	306	HYPERVISOR_mca(struct xen_mc *mc_op)
	307	{
	308	mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
	309	return _hypercall1(int, mca, mc_op);
	310	}
	311
eec07a9e JF	312	static inline int
	313	HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
	314	{
	315	platform_op->interface_version = XENPF_INTERFACE_VERSION;
	316	return _hypercall1(int, dom0_op, platform_op);
	317	}
	318
a42089dd JF	319	static inline int
	320	HYPERVISOR_set_debugreg(int reg, unsigned long value)
	321	{
	322	return _hypercall2(int, set_debugreg, reg, value);
	323	}
	324
	325	static inline unsigned long
	326	HYPERVISOR_get_debugreg(int reg)
	327	{
	328	return _hypercall1(unsigned long, get_debugreg, reg);
	329	}
	330
	331	static inline int
	332	HYPERVISOR_update_descriptor(u64 ma, u64 desc)
	333	{
6a5c05f0 JB	334	if (sizeof(u64) == sizeof(long))
6a5c05f0 JB	335	return _hypercall2(int, update_descriptor, ma, desc);
a42089dd JF	336	return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
	337	}
	338
	339	static inline int
	340	HYPERVISOR_memory_op(unsigned int cmd, void *arg)
	341	{
	342	return _hypercall2(int, memory_op, cmd, arg);
	343	}
	344
	345	static inline int
5e40704e	346	HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
a42089dd JF	347	{
	348	return _hypercall2(int, multicall, call_list, nr_calls);
	349	}
	350
	351	static inline int
	352	HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
	353	unsigned long flags)
	354	{
ca15f20f JF	355	if (sizeof(new_val) == sizeof(long))
	356	return _hypercall3(int, update_va_mapping, va,
	357	new_val.pte, flags);
	358	else
	359	return _hypercall4(int, update_va_mapping, va,
	360	new_val.pte, new_val.pte >> 32, flags);
a42089dd	361	}
cf47a83f	362	extern int __must_check xen_event_channel_op_compat(int, void *);
a42089dd JF	363
	364	static inline int
	365	HYPERVISOR_event_channel_op(int cmd, void *arg)
	366	{
	367	int rc = _hypercall2(int, event_channel_op, cmd, arg);
cf47a83f JB	368	if (unlikely(rc == -ENOSYS))
cf47a83f JB	369	rc = xen_event_channel_op_compat(cmd, arg);
a42089dd JF	370	return rc;
	371	}
	372
	373	static inline int
	374	HYPERVISOR_xen_version(int cmd, void *arg)
	375	{
	376	return _hypercall2(int, xen_version, cmd, arg);
	377	}
	378
	379	static inline int
	380	HYPERVISOR_console_io(int cmd, int count, char *str)
	381	{
	382	return _hypercall3(int, console_io, cmd, count, str);
	383	}
	384
909b3fdb	385	extern int __must_check xen_physdev_op_compat(int, void *);
cf47a83f	386
a42089dd JF	387	static inline int
	388	HYPERVISOR_physdev_op(int cmd, void *arg)
	389	{
	390	int rc = _hypercall2(int, physdev_op, cmd, arg);
cf47a83f	391	if (unlikely(rc == -ENOSYS))
909b3fdb	392	rc = xen_physdev_op_compat(cmd, arg);
a42089dd JF	393	return rc;
	394	}
	395
	396	static inline int
	397	HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
	398	{
	399	return _hypercall3(int, grant_table_op, cmd, uop, count);
	400	}
	401
	402	static inline int
	403	HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
	404	unsigned long flags, domid_t domid)
	405	{
ca15f20f JF	406	if (sizeof(new_val) == sizeof(long))
	407	return _hypercall4(int, update_va_mapping_otherdomain, va,
	408	new_val.pte, flags, domid);
	409	else
	410	return _hypercall5(int, update_va_mapping_otherdomain, va,
	411	new_val.pte, new_val.pte >> 32,
	412	flags, domid);
a42089dd JF	413	}
	414
	415	static inline int
	416	HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
	417	{
	418	return _hypercall2(int, vm_assist, cmd, type);
	419	}
	420
	421	static inline int
	422	HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
	423	{
	424	return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
	425	}
	426
45eb0d88 EH	427	#ifdef CONFIG_X86_64
	428	static inline int
	429	HYPERVISOR_set_segment_base(int reg, unsigned long value)
	430	{
	431	return _hypercall2(int, set_segment_base, reg, value);
	432	}
	433	#endif
	434
a42089dd	435	static inline int
8e15597f	436	HYPERVISOR_suspend(unsigned long start_info_mfn)
a42089dd	437	{
8e15597f IC	438	struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
	439
	440	/*
	441	* For a PV guest the tools require that the start_info mfn be
	442	* present in rdx/edx when the hypercall is made. Per the
	443	* hypercall calling convention this is the third hypercall
	444	* argument, which is start_info_mfn here.
	445	*/
a8b74583	446	return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
a42089dd JF	447	}
	448
	449	static inline int
	450	HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
	451	{
	452	return _hypercall2(int, nmi_op, op, arg);
	453	}
	454
18f19aa6 JF	455	static inline unsigned long __must_check
	456	HYPERVISOR_hvm_op(int op, void *arg)
	457	{
	458	return _hypercall2(unsigned long, hvm_op, op, arg);
	459	}
	460
5bc20fc5 DM	461	static inline int
	462	HYPERVISOR_tmem_op(
	463	struct tmem_op *op)
	464	{
	465	return _hypercall1(int, tmem_op, op);
	466	}
	467
5f141548 BO	468	static inline int
	469	HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
	470	{
	471	return _hypercall2(int, xenpmu_op, op, arg);
	472	}
	473
7b1333aa JF	474	static inline void
	475	MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
	476	{
	477	mcl->op = __HYPERVISOR_fpu_taskswitch;
	478	mcl->args[0] = set;
c796f213 JF	479
c796f213 JF	480	trace_xen_mc_entry(mcl, 1);
7b1333aa JF	481	}
7b1333aa JF	482
a42089dd JF	483	static inline void
	484	MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
	485	pte_t new_val, unsigned long flags)
	486	{
	487	mcl->op = __HYPERVISOR_update_va_mapping;
	488	mcl->args[0] = va;
ca15f20f JF	489	if (sizeof(new_val) == sizeof(long)) {
	490	mcl->args[1] = new_val.pte;
	491	mcl->args[2] = flags;
	492	} else {
	493	mcl->args[1] = new_val.pte;
	494	mcl->args[2] = new_val.pte >> 32;
	495	mcl->args[3] = flags;
	496	}
c796f213 JF	497
c796f213 JF	498	trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
a42089dd JF	499	}
	500
	501	static inline void
	502	MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
	503	void *uop, unsigned int count)
	504	{
	505	mcl->op = __HYPERVISOR_grant_table_op;
	506	mcl->args[0] = cmd;
	507	mcl->args[1] = (unsigned long)uop;
	508	mcl->args[2] = count;
c796f213 JF	509
c796f213 JF	510	trace_xen_mc_entry(mcl, 3);
a42089dd JF	511	}
	512
	513	static inline void
	514	MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
	515	pte_t new_val, unsigned long flags,
	516	domid_t domid)
	517	{
	518	mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
	519	mcl->args[0] = va;
ca15f20f JF	520	if (sizeof(new_val) == sizeof(long)) {
	521	mcl->args[1] = new_val.pte;
	522	mcl->args[2] = flags;
	523	mcl->args[3] = domid;
	524	} else {
	525	mcl->args[1] = new_val.pte;
	526	mcl->args[2] = new_val.pte >> 32;
	527	mcl->args[3] = flags;
	528	mcl->args[4] = domid;
	529	}
c796f213 JF	530
c796f213 JF	531	trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
a42089dd JF	532	}
	533
	534	static inline void
	535	MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
	536	struct desc_struct desc)
	537	{
	538	mcl->op = __HYPERVISOR_update_descriptor;
c05f1cfa JF	539	if (sizeof(maddr) == sizeof(long)) {
	540	mcl->args[0] = maddr;
	541	mcl->args[1] = (unsigned long )&desc;
	542	} else {
	543	mcl->args[0] = maddr;
	544	mcl->args[1] = maddr >> 32;
	545	mcl->args[2] = desc.a;
	546	mcl->args[3] = desc.b;
	547	}
c796f213 JF	548
c796f213 JF	549	trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
a42089dd JF	550	}
	551
	552	static inline void
	553	MULTI_memory_op(struct multicall_entry mcl, unsigned int cmd, void arg)
	554	{
	555	mcl->op = __HYPERVISOR_memory_op;
	556	mcl->args[0] = cmd;
	557	mcl->args[1] = (unsigned long)arg;
c796f213 JF	558
c796f213 JF	559	trace_xen_mc_entry(mcl, 2);
a42089dd JF	560	}
	561
	562	static inline void
	563	MULTI_mmu_update(struct multicall_entry mcl, struct mmu_update req,
	564	int count, int *success_count, domid_t domid)
	565	{
	566	mcl->op = __HYPERVISOR_mmu_update;
	567	mcl->args[0] = (unsigned long)req;
	568	mcl->args[1] = count;
	569	mcl->args[2] = (unsigned long)success_count;
	570	mcl->args[3] = domid;
c796f213 JF	571
c796f213 JF	572	trace_xen_mc_entry(mcl, 4);
a42089dd JF	573	}
	574
	575	static inline void
	576	MULTI_mmuext_op(struct multicall_entry mcl, struct mmuext_op op, int count,
	577	int *success_count, domid_t domid)
	578	{
	579	mcl->op = __HYPERVISOR_mmuext_op;
	580	mcl->args[0] = (unsigned long)op;
	581	mcl->args[1] = count;
	582	mcl->args[2] = (unsigned long)success_count;
	583	mcl->args[3] = domid;
c796f213 JF	584
c796f213 JF	585	trace_xen_mc_entry(mcl, 4);
a42089dd	586	}
5ead97c8 JF	587
	588	static inline void
	589	MULTI_set_gdt(struct multicall_entry mcl, unsigned long frames, int entries)
	590	{
	591	mcl->op = __HYPERVISOR_set_gdt;
	592	mcl->args[0] = (unsigned long)frames;
	593	mcl->args[1] = entries;
c796f213 JF	594
c796f213 JF	595	trace_xen_mc_entry(mcl, 2);
5ead97c8 JF	596	}
	597
	598	static inline void
	599	MULTI_stack_switch(struct multicall_entry *mcl,
	600	unsigned long ss, unsigned long esp)
	601	{
	602	mcl->op = __HYPERVISOR_stack_switch;
	603	mcl->args[0] = ss;
	604	mcl->args[1] = esp;
c796f213 JF	605
c796f213 JF	606	trace_xen_mc_entry(mcl, 2);
5ead97c8 JF	607	}
5ead97c8 JF	608
05e4d316	609	#endif /* _ASM_X86_XEN_HYPERCALL_H */