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xen: Add Xen interface header files
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Add Xen interface header files. These are taken fairly directly from
the Xen tree, but somewhat rearranged to suit the kernel's conventions.

Define macros and inline functions for doing hypercalls into the
hypervisor.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
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Jeremy Fitzhardinge authored and Jeremy Fitzhardinge committed Jul 18, 2007
1 parent 24037a8 commit a42089d
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395 changes: 395 additions & 0 deletions include/asm-i386/xen/hypercall.h
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/******************************************************************************
* 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 __HYPERCALL_H__
#define __HYPERCALL_H__

#include <linux/errno.h>
#include <linux/string.h>

#include <xen/interface/xen.h>
#include <xen/interface/sched.h>
#include <xen/interface/physdev.h>

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

#define _hypercall0(type, name) \
({ \
long __res; \
asm volatile ( \
"call %[call]" \
: "=a" (__res) \
: [call] "m" (hypercall_page[__HYPERVISOR_##name]) \
: "memory" ); \
(type)__res; \
})

#define _hypercall1(type, name, a1) \
({ \
long __res, __ign1; \
asm volatile ( \
"call %[call]" \
: "=a" (__res), "=b" (__ign1) \
: "1" ((long)(a1)), \
[call] "m" (hypercall_page[__HYPERVISOR_##name]) \
: "memory" ); \
(type)__res; \
})

#define _hypercall2(type, name, a1, a2) \
({ \
long __res, __ign1, __ign2; \
asm volatile ( \
"call %[call]" \
: "=a" (__res), "=b" (__ign1), "=c" (__ign2) \
: "1" ((long)(a1)), "2" ((long)(a2)), \
[call] "m" (hypercall_page[__HYPERVISOR_##name]) \
: "memory" ); \
(type)__res; \
})

#define _hypercall3(type, name, a1, a2, a3) \
({ \
long __res, __ign1, __ign2, __ign3; \
asm volatile ( \
"call %[call]" \
: "=a" (__res), "=b" (__ign1), "=c" (__ign2), \
"=d" (__ign3) \
: "1" ((long)(a1)), "2" ((long)(a2)), \
"3" ((long)(a3)), \
[call] "m" (hypercall_page[__HYPERVISOR_##name]) \
: "memory" ); \
(type)__res; \
})

#define _hypercall4(type, name, a1, a2, a3, a4) \
({ \
long __res, __ign1, __ign2, __ign3, __ign4; \
asm volatile ( \
"call %[call]" \
: "=a" (__res), "=b" (__ign1), "=c" (__ign2), \
"=d" (__ign3), "=S" (__ign4) \
: "1" ((long)(a1)), "2" ((long)(a2)), \
"3" ((long)(a3)), "4" ((long)(a4)), \
[call] "m" (hypercall_page[__HYPERVISOR_##name]) \
: "memory" ); \
(type)__res; \
})

#define _hypercall5(type, name, a1, a2, a3, a4, a5) \
({ \
long __res, __ign1, __ign2, __ign3, __ign4, __ign5; \
asm volatile ( \
"call %[call]" \
: "=a" (__res), "=b" (__ign1), "=c" (__ign2), \
"=d" (__ign3), "=S" (__ign4), "=D" (__ign5) \
: "1" ((long)(a1)), "2" ((long)(a2)), \
"3" ((long)(a3)), "4" ((long)(a4)), \
"5" ((long)(a5)), \
[call] "m" (hypercall_page[__HYPERVISOR_##name]) \
: "memory" ); \
(type)__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);
}

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);
}

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

static inline int
HYPERVISOR_sched_op(int cmd, unsigned long 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_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)
{
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, int 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)
{
unsigned long pte_hi = 0;
#ifdef CONFIG_X86_PAE
pte_hi = new_val.pte_high;
#endif
return _hypercall4(int, update_va_mapping, va,
new_val.pte_low, pte_hi, flags);
}

static inline int
HYPERVISOR_event_channel_op(int cmd, void *arg)
{
int rc = _hypercall2(int, event_channel_op, cmd, arg);
if (unlikely(rc == -ENOSYS)) {
struct evtchn_op op;
op.cmd = cmd;
memcpy(&op.u, arg, sizeof(op.u));
rc = _hypercall1(int, event_channel_op_compat, &op);
memcpy(arg, &op.u, sizeof(op.u));
}
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);
}

static inline int
HYPERVISOR_physdev_op(int cmd, void *arg)
{
int rc = _hypercall2(int, physdev_op, cmd, arg);
if (unlikely(rc == -ENOSYS)) {
struct physdev_op op;
op.cmd = cmd;
memcpy(&op.u, arg, sizeof(op.u));
rc = _hypercall1(int, physdev_op_compat, &op);
memcpy(arg, &op.u, sizeof(op.u));
}
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)
{
unsigned long pte_hi = 0;
#ifdef CONFIG_X86_PAE
pte_hi = new_val.pte_high;
#endif
return _hypercall5(int, update_va_mapping_otherdomain, va,
new_val.pte_low, pte_hi, 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);
}

static inline int
HYPERVISOR_suspend(unsigned long srec)
{
return _hypercall3(int, sched_op, SCHEDOP_shutdown,
SHUTDOWN_suspend, srec);
}

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

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;
#ifdef CONFIG_X86_PAE
mcl->args[1] = new_val.pte_low;
mcl->args[2] = new_val.pte_high;
#else
mcl->args[1] = new_val.pte_low;
mcl->args[2] = 0;
#endif
mcl->args[3] = flags;
}

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;
}

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;
#ifdef CONFIG_X86_PAE
mcl->args[1] = new_val.pte_low;
mcl->args[2] = new_val.pte_high;
#else
mcl->args[1] = new_val.pte_low;
mcl->args[2] = 0;
#endif
mcl->args[3] = flags;
mcl->args[4] = domid;
}

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

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;
}

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;
}

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;
}
#endif /* __HYPERCALL_H__ */
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