[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / kvm / book3s_32_sr.S

/*
 * 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>
 */

/******************************************************************************
 *                                                                            *
 *                               Entry code                                   *
 *                                                                            *
 *****************************************************************************/

.macro LOAD_GUEST_SEGMENTS

	/* Required state:
	 *
	 * MSR = ~IR|DR
	 * 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
	 */

#define XCHG_SR(n)	lwz	r9, (SVCPU_SR+(n*4))(r3);  \
			mtsr	n, r9

	XCHG_SR(0)
	XCHG_SR(1)
	XCHG_SR(2)
	XCHG_SR(3)
	XCHG_SR(4)
	XCHG_SR(5)
	XCHG_SR(6)
	XCHG_SR(7)
	XCHG_SR(8)
	XCHG_SR(9)
	XCHG_SR(10)
	XCHG_SR(11)
	XCHG_SR(12)
	XCHG_SR(13)
	XCHG_SR(14)
	XCHG_SR(15)

	/* Clear BATs. */

#define KVM_KILL_BAT(n, reg)		\
        mtspr   SPRN_IBAT##n##U,reg;	\
        mtspr   SPRN_IBAT##n##L,reg;	\
        mtspr   SPRN_DBAT##n##U,reg;	\
        mtspr   SPRN_DBAT##n##L,reg;	\

        li	r9, 0
	KVM_KILL_BAT(0, r9)
	KVM_KILL_BAT(1, r9)
	KVM_KILL_BAT(2, r9)
	KVM_KILL_BAT(3, r9)

.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
	 * SVCPU.*    = guest *
	 * SVCPU[CR]  = guest CR
	 * SVCPU[XER] = guest XER
	 * SVCPU[CTR] = guest CTR
	 * SVCPU[LR]  = guest LR
	 *
	 */

	/* Restore BATs */

	/* We only overwrite the upper part, so we only restoree
	   the upper part. */
#define KVM_LOAD_BAT(n, reg, RA, RB)	\
	lwz	RA,(n*16)+0(reg);	\
	lwz	RB,(n*16)+4(reg);	\
	mtspr	SPRN_IBAT##n##U,RA;	\
	mtspr	SPRN_IBAT##n##L,RB;	\
	lwz	RA,(n*16)+8(reg);	\
	lwz	RB,(n*16)+12(reg);	\
	mtspr	SPRN_DBAT##n##U,RA;	\
	mtspr	SPRN_DBAT##n##L,RB;	\

	lis     r9, BATS@ha
	addi    r9, r9, BATS@l
	tophys(r9, r9)
	KVM_LOAD_BAT(0, r9, r10, r11)
	KVM_LOAD_BAT(1, r9, r10, r11)
	KVM_LOAD_BAT(2, r9, r10, r11)
	KVM_LOAD_BAT(3, r9, r10, r11)

	/* Restore Segment Registers */

	/* 0xc - 0xf */

        li      r0, 4
        mtctr   r0
	LOAD_REG_IMMEDIATE(r3, 0x20000000 | (0x111 * 0xc))
        lis     r4, 0xc000
3:      mtsrin  r3, r4
        addi    r3, r3, 0x111     /* increment VSID */
        addis   r4, r4, 0x1000    /* address of next segment */
        bdnz    3b

	/* 0x0 - 0xb */

	/* 'current->mm' needs to be in r4 */
	tophys(r4, r2)
	lwz	r4, MM(r4)
	tophys(r4, r4)
	/* This only clobbers r0, r3, r4 and r5 */
	bl	switch_mmu_context

.endm
Commit	Line	Data
786f19da AG	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License, version 2, as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* You should have received a copy of the GNU General Public License
	12	* along with this program; if not, write to the Free Software
	13	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	14	*
	15	* Copyright SUSE Linux Products GmbH 2009
	16	*
	17	* Authors: Alexander Graf <agraf@suse.de>
	18	*/
	19
	20	/******************************************************************************
	21	* *
	22	* Entry code *
	23	* *
	24	*****************************************************************************/
	25
	26	.macro LOAD_GUEST_SEGMENTS
	27
	28	/* Required state:
	29	*
	30	* MSR = ~IR\|DR
	31	* R1 = host R1
	32	* R2 = host R2
	33	* R3 = shadow vcpu
02143947	34	* all other volatile GPRS = free except R4, R6
786f19da AG	35	* SVCPU[CR] = guest CR
	36	* SVCPU[XER] = guest XER
	37	* SVCPU[CTR] = guest CTR
	38	* SVCPU[LR] = guest LR
	39	*/
	40
	41	#define XCHG_SR(n) lwz r9, (SVCPU_SR+(n*4))(r3); \
	42	mtsr n, r9
	43
	44	XCHG_SR(0)
	45	XCHG_SR(1)
	46	XCHG_SR(2)
	47	XCHG_SR(3)
	48	XCHG_SR(4)
	49	XCHG_SR(5)
	50	XCHG_SR(6)
	51	XCHG_SR(7)
	52	XCHG_SR(8)
	53	XCHG_SR(9)
	54	XCHG_SR(10)
	55	XCHG_SR(11)
	56	XCHG_SR(12)
	57	XCHG_SR(13)
	58	XCHG_SR(14)
	59	XCHG_SR(15)
	60
	61	/* Clear BATs. */
	62
	63	#define KVM_KILL_BAT(n, reg) \
	64	mtspr SPRN_IBAT##n##U,reg; \
	65	mtspr SPRN_IBAT##n##L,reg; \
	66	mtspr SPRN_DBAT##n##U,reg; \
	67	mtspr SPRN_DBAT##n##L,reg; \
	68
	69	li r9, 0
	70	KVM_KILL_BAT(0, r9)
	71	KVM_KILL_BAT(1, r9)
	72	KVM_KILL_BAT(2, r9)
	73	KVM_KILL_BAT(3, r9)
	74
	75	.endm
	76
	77	/******************************************************************************
	78	* *
	79	* Exit code *
	80	* *
	81	*****************************************************************************/
	82
	83	.macro LOAD_HOST_SEGMENTS
	84
	85	/* Register usage at this point:
	86	*
	87	* R1 = host R1
	88	* R2 = host R2
	89	* R12 = exit handler id
	90	* R13 = shadow vcpu - SHADOW_VCPU_OFF
	91	* SVCPU.* = guest *
	92	* SVCPU[CR] = guest CR
	93	* SVCPU[XER] = guest XER
	94	* SVCPU[CTR] = guest CTR
	95	* SVCPU[LR] = guest LR
	96	*
	97	*/
	98
99	/* Restore BATs */
100
101	/* We only overwrite the upper part, so we only restoree
102	the upper part. */
103	#define KVM_LOAD_BAT(n, reg, RA, RB) \
104	lwz RA,(n*16)+0(reg); \
105	lwz RB,(n*16)+4(reg); \
106	mtspr SPRN_IBAT##n##U,RA; \
107	mtspr SPRN_IBAT##n##L,RB; \
108	lwz RA,(n*16)+8(reg); \
109	lwz RB,(n*16)+12(reg); \
110	mtspr SPRN_DBAT##n##U,RA; \
111	mtspr SPRN_DBAT##n##L,RB; \
112
113	lis r9, BATS@ha
114	addi r9, r9, BATS@l
115	tophys(r9, r9)
116	KVM_LOAD_BAT(0, r9, r10, r11)
117	KVM_LOAD_BAT(1, r9, r10, r11)
118	KVM_LOAD_BAT(2, r9, r10, r11)
119	KVM_LOAD_BAT(3, r9, r10, r11)
120
121	/* Restore Segment Registers */
122
123	/* 0xc - 0xf */
124
125	li r0, 4
126	mtctr r0
127	LOAD_REG_IMMEDIATE(r3, 0x20000000 \| (0x111 * 0xc))
128	lis r4, 0xc000
129	3: mtsrin r3, r4
130	addi r3, r3, 0x111 /* increment VSID */
131	addis r4, r4, 0x1000 /* address of next segment */
132	bdnz 3b
133
134	/* 0x0 - 0xb */
135
136	/* 'current->mm' needs to be in r4 */
137	tophys(r4, r2)
138	lwz r4, MM(r4)
139	tophys(r4, r4)
140	/* This only clobbers r0, r3, r4 and r5 */
141	bl switch_mmu_context
142
143	.endm