/*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2008
*
* Authors: Hollis Blanchard <[email protected]>
*/
#ifndef __POWERPC_KVM_PARA_H__
#define __POWERPC_KVM_PARA_H__

#include <uapi/asm/kvm_para.h>

#ifdef CONFIG_KVM_GUEST

#include <linux/of.h>

static inline int kvm_para_available(void)
{
struct device_node *hyper_node;

hyper_node = of_find_node_by_path("/hypervisor");
if (!hyper_node)
return 0;

if (!of_device_is_compatible(hyper_node, "linux,kvm"))
return 0;

return 1;
}

extern unsigned long kvm_hypercall(unsigned long *in,
unsigned long *out,
unsigned long nr);

#else

static inline int kvm_para_available(void)
{
return 0;
}

static unsigned long kvm_hypercall(unsigned long *in,
unsigned long *out,
unsigned long nr)
{
return EV_UNIMPLEMENTED;
}

#endif

static inline long kvm_hypercall0_1(unsigned int nr, unsigned long *r2)
{
unsigned long in[8];
unsigned long out[8];
unsigned long r;

r = kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
*r2 = out[0];

return r;
}

static inline long kvm_hypercall0(unsigned int nr)
{
unsigned long in[8];
unsigned long out[8];

return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
}

static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
{
unsigned long in[8];
unsigned long out[8];

in[0] = p1;
return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
}

static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
unsigned long p2)
{
unsigned long in[8];
unsigned long out[8];

in[0] = p1;
in[1] = p2;
return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
}

static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
unsigned long p2, unsigned long p3)
{
unsigned long in[8];
unsigned long out[8];

in[0] = p1;
in[1] = p2;
in[2] = p3;
return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
}

static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
unsigned long p2, unsigned long p3,
unsigned long p4)
{
unsigned long in[8];
unsigned long out[8];

in[0] = p1;
in[1] = p2;
in[2] = p3;
in[3] = p4;
return kvm_hypercall(in, out, KVM_HCALL_TOKEN(nr));
}


static inline unsigned int kvm_arch_para_features(void)
{
unsigned long r;

if (!kvm_para_available())
return 0;

if(kvm_hypercall0_1(KVM_HC_FEATURES, &r))
return 0;

return r;
}

static inline bool kvm_check_and_clear_guest_paused(void)
{
return false;
}

#endif /* __POWERPC_KVM_PARA_H__ */