/*
* 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 2009
*
* Authors: Alexander Graf <agraf@suse.de>
*/
#include <asm/asm-compat.h>
#include <asm/feature-fixups.h>
#define SHADOW_SLB_ENTRY_LEN 0x10
#define OFFSET_ESID(x) (SHADOW_SLB_ENTRY_LEN * x)
#define OFFSET_VSID(x) ((SHADOW_SLB_ENTRY_LEN * x) + 8)
/******************************************************************************
* *
* Entry code *
* *
*****************************************************************************/
.macro LOAD_GUEST_SEGMENTS
/* Required state:
*
* MSR = ~IR|DR
* R13 = PACA
* R1 = host R1
* R2 = host R2
* R3 = shadow vcpu
* all other volatile GPRS = free except R4, R6
* SVCPU[CR] = guest CR
* SVCPU[XER] = guest XER
* SVCPU[CTR] = guest CTR
* SVCPU[LR] = guest LR
*/
BEGIN_FW_FTR_SECTION
/* Declare SLB shadow as 0 entries big */
ld r11, PACA_SLBSHADOWPTR(r13)
li r8, 0
stb r8, 3(r11)
END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR)
/* Flush SLB */
li r10, 0
slbmte r10, r10
slbia
/* Fill SLB with our shadow */
lbz r12, SVCPU_SLB_MAX(r3)
mulli r12, r12, 16
addi r12, r12, SVCPU_SLB
add r12, r12, r3
/* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */
li r11, SVCPU_SLB
add r11, r11, r3
slb_loop_enter:
ld r10, 0(r11)
andis. r9, r10, SLB_ESID_V@h
beq slb_loop_enter_skip
ld r9, 8(r11)
slbmte r9, r10
slb_loop_enter_skip:
addi r11, r11, 16
cmpd cr0, r11, r12
blt slb_loop_enter
slb_do_enter:
.endm
/******************************************************************************
* *
* Exit code *
* *
*****************************************************************************/
.macro LOAD_HOST_SEGMENTS
/* Register usage at this point:
*
* R1 = host R1
* R2 = host R2
* R12 = exit handler id
* R13 = shadow vcpu - SHADOW_VCPU_OFF [=PACA on PPC64]
* SVCPU.* = guest *
* SVCPU[CR] = guest CR
* SVCPU[XER] = guest XER
* SVCPU[CTR] = guest CTR
* SVCPU[LR] = guest LR
*
*/
/* Remove all SLB entries that are in use. */
li r0, 0
slbmte r0, r0
slbia
/* Restore bolted entries from the shadow */
ld r11, PACA_SLBSHADOWPTR(r13)
BEGIN_FW_FTR_SECTION
/* Declare SLB shadow as SLB_NUM_BOLTED entries big */
li r8, SLB_NUM_BOLTED
stb r8, 3(r11)
END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR)
/* Manually load all entries from shadow SLB */
li r8, SLBSHADOW_SAVEAREA
li r7, SLBSHADOW_SAVEAREA + 8
.rept SLB_NUM_BOLTED
LDX_BE r10, r11, r8
cmpdi r10, 0
beq 1f
LDX_BE r9, r11, r7
slbmte r9, r10
1: addi r7, r7, SHADOW_SLB_ENTRY_LEN
addi r8, r8, SHADOW_SLB_ENTRY_LEN
.endr
isync
sync
slb_do_exit:
.endm
