/*
* 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 SUSE Linux Products GmbH 2010
*
* Authors: Alexander Graf <agraf@suse.de>
*/
#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
/* Hypercall entry point. Will be patched with device tree instructions. */
.global kvm_hypercall_start
kvm_hypercall_start:
li r3, -1
nop
nop
nop
blr
#define KVM_MAGIC_PAGE (-4096)
#ifdef CONFIG_64BIT
#define LL64(reg, offs, reg2) ld reg, (offs)(reg2)
#define STL64(reg, offs, reg2) std reg, (offs)(reg2)
#else
#define LL64(reg, offs, reg2) lwz reg, (offs + 4)(reg2)
#define STL64(reg, offs, reg2) stw reg, (offs + 4)(reg2)
#endif
#define SCRATCH_SAVE \
/* Enable critical section. We are critical if \
shared->critical == r1 */ \
STL64(r1, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); \
\
/* Save state */ \
PPC_STL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
PPC_STL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
mfcr r31; \
stw r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0);
#define SCRATCH_RESTORE \
/* Restore state */ \
PPC_LL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0); \
mtcr r30; \
PPC_LL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
\
/* Disable critical section. We are critical if \
shared->critical == r1 and r2 is always != r1 */ \
STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0);
