2010-07-29 05:47:57 -07:00
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright SUSE Linux Products GmbH 2010
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*
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* Authors: Alexander Graf <agraf@suse.de>
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*/
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#include <asm/ppc_asm.h>
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#include <asm/kvm_asm.h>
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#include <asm/reg.h>
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#include <asm/page.h>
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#include <asm/asm-offsets.h>
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/* Hypercall entry point. Will be patched with device tree instructions. */
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.global kvm_hypercall_start
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kvm_hypercall_start:
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li r3, -1
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nop
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nop
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nop
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blr
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#define KVM_MAGIC_PAGE (-4096)
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2010-07-29 05:48:03 -07:00
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#ifdef CONFIG_64BIT
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#define LL64(reg, offs, reg2) ld reg, (offs)(reg2)
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#define STL64(reg, offs, reg2) std reg, (offs)(reg2)
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#else
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#define LL64(reg, offs, reg2) lwz reg, (offs + 4)(reg2)
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#define STL64(reg, offs, reg2) stw reg, (offs + 4)(reg2)
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#endif
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#define SCRATCH_SAVE \
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/* Enable critical section. We are critical if \
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shared->critical == r1 */ \
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STL64(r1, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); \
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\
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/* Save state */ \
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PPC_STL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
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PPC_STL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
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mfcr r31; \
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stw r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0);
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#define SCRATCH_RESTORE \
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/* Restore state */ \
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PPC_LL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
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lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0); \
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mtcr r30; \
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PPC_LL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
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\
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/* Disable critical section. We are critical if \
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shared->critical == r1 and r2 is always != r1 */ \
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STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0);
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