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/*
* 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 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
*
* Derived from book3s_interrupts.S, which is:
* Copyright SUSE Linux Products GmbH 2009
*
* 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>
#include <asm/exception-64s.h>
#include <asm/ppc-opcode.h>
/*****************************************************************************
* *
* Guest entry / exit code that is in kernel module memory (vmalloc) *
* *
****************************************************************************/
/* Registers:
* r4: vcpu pointer
*/
_GLOBAL(__kvmppc_vcore_entry)
/* Write correct stack frame */
mflr r0
std r0,PPC_LR_STKOFF(r1)
/* Save host state to the stack */
stdu r1, -SWITCH_FRAME_SIZE(r1)
/* Save non-volatile registers (r14 - r31) and CR */
SAVE_NVGPRS(r1)
mfcr r3
std r3, _CCR(r1)
/* Save host DSCR */
BEGIN_FTR_SECTION
mfspr r3, SPRN_DSCR
std r3, HSTATE_DSCR(r13)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* Save host DABR */
mfspr r3, SPRN_DABR
std r3, HSTATE_DABR(r13)
/* Hard-disable interrupts */
mfmsr r10
std r10, HSTATE_HOST_MSR(r13)
rldicl r10,r10,48,1
rotldi r10,r10,16
mtmsrd r10,1
/* Save host PMU registers */
/* R4 is live here (vcpu pointer) but not r3 or r5 */
li r3, 1
sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */
mfspr r7, SPRN_MMCR0 /* save MMCR0 */
mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */
mfspr r6, SPRN_MMCRA
BEGIN_FTR_SECTION
/* On P7, clear MMCRA in order to disable SDAR updates */
li r5, 0
mtspr SPRN_MMCRA, r5
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
isync
ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */
lbz r5, LPPACA_PMCINUSE(r3)
cmpwi r5, 0
beq 31f /* skip if not */
mfspr r5, SPRN_MMCR1
std r7, HSTATE_MMCR(r13)
std r5, HSTATE_MMCR + 8(r13)
std r6, HSTATE_MMCR + 16(r13)
mfspr r3, SPRN_PMC1
mfspr r5, SPRN_PMC2
mfspr r6, SPRN_PMC3
mfspr r7, SPRN_PMC4
mfspr r8, SPRN_PMC5
mfspr r9, SPRN_PMC6
BEGIN_FTR_SECTION
mfspr r10, SPRN_PMC7
mfspr r11, SPRN_PMC8
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
stw r3, HSTATE_PMC(r13)
stw r5, HSTATE_PMC + 4(r13)
stw r6, HSTATE_PMC + 8(r13)
stw r7, HSTATE_PMC + 12(r13)
stw r8, HSTATE_PMC + 16(r13)
stw r9, HSTATE_PMC + 20(r13)
BEGIN_FTR_SECTION
stw r10, HSTATE_PMC + 24(r13)
stw r11, HSTATE_PMC + 28(r13)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
31:
/*
* Put whatever is in the decrementer into the
* hypervisor decrementer.
*/
mfspr r8,SPRN_DEC
mftb r7
mtspr SPRN_HDEC,r8
extsw r8,r8
add r8,r8,r7
std r8,HSTATE_DECEXP(r13)
#ifdef CONFIG_SMP
/*
* On PPC970, if the guest vcpu has an external interrupt pending,
* send ourselves an IPI so as to interrupt the guest once it
* enables interrupts. (It must have interrupts disabled,
* otherwise we would already have delivered the interrupt.)
*
* XXX If this is a UP build, smp_send_reschedule is not available,
* so the interrupt will be delayed until the next time the vcpu
* enters the guest with interrupts enabled.
*/
BEGIN_FTR_SECTION
ld r0, VCPU_PENDING_EXC(r4)
li r7, (1 << BOOK3S_IRQPRIO_EXTERNAL)
oris r7, r7, (1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h
and. r0, r0, r7
beq 32f
mr r31, r4
lhz r3, PACAPACAINDEX(r13)
bl smp_send_reschedule
nop
mr r4, r31
32:
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
#endif /* CONFIG_SMP */
/* Jump to partition switch code */
bl .kvmppc_hv_entry_trampoline
nop
/*
* We return here in virtual mode after the guest exits
* with something that we can't handle in real mode.
* Interrupts are enabled again at this point.
*/
/*
* Register usage at this point:
*
* R1 = host R1
* R2 = host R2
* R12 = exit handler id
* R13 = PACA
*/
/* Restore non-volatile host registers (r14 - r31) and CR */
REST_NVGPRS(r1)
ld r4, _CCR(r1)
mtcr r4
addi r1, r1, SWITCH_FRAME_SIZE
ld r0, PPC_LR_STKOFF(r1)
mtlr r0
blr
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