book3s_32_sr.S

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *
  4 * Copyright SUSE Linux Products GmbH 2009
  5 *
  6 * Authors: Alexander Graf <agraf@suse.de>
  7 */
  8
  9/******************************************************************************
 10 *                                                                            *
 11 *                               Entry code                                   *
 12 *                                                                            *
 13 *****************************************************************************/
 14
 15.macro LOAD_GUEST_SEGMENTS
 16
 17	/* Required state:
 18	 *
 19	 * MSR = ~IR|DR
 20	 * R1 = host R1
 21	 * R2 = host R2
 22	 * R3 = shadow vcpu
 23	 * all other volatile GPRS = free except R4, R6
 24	 * SVCPU[CR]  = guest CR
 25	 * SVCPU[XER] = guest XER
 26	 * SVCPU[CTR] = guest CTR
 27	 * SVCPU[LR]  = guest LR
 28	 */
 29
 30#define XCHG_SR(n)	lwz	r9, (SVCPU_SR+(n*4))(r3);  \
 31			mtsr	n, r9
 32
 33	XCHG_SR(0)
 34	XCHG_SR(1)
 35	XCHG_SR(2)
 36	XCHG_SR(3)
 37	XCHG_SR(4)
 38	XCHG_SR(5)
 39	XCHG_SR(6)
 40	XCHG_SR(7)
 41	XCHG_SR(8)
 42	XCHG_SR(9)
 43	XCHG_SR(10)
 44	XCHG_SR(11)
 45	XCHG_SR(12)
 46	XCHG_SR(13)
 47	XCHG_SR(14)
 48	XCHG_SR(15)
 49
 50	/* Clear BATs. */
 51
 52#define KVM_KILL_BAT(n, reg)		\
 53        mtspr   SPRN_IBAT##n##U,reg;	\
 54        mtspr   SPRN_IBAT##n##L,reg;	\
 55        mtspr   SPRN_DBAT##n##U,reg;	\
 56        mtspr   SPRN_DBAT##n##L,reg;	\
 57
 58        li	r9, 0
 59	KVM_KILL_BAT(0, r9)
 60	KVM_KILL_BAT(1, r9)
 61	KVM_KILL_BAT(2, r9)
 62	KVM_KILL_BAT(3, r9)
 63
 64.endm
 65
 66/******************************************************************************
 67 *                                                                            *
 68 *                               Exit code                                    *
 69 *                                                                            *
 70 *****************************************************************************/
 71
 72.macro LOAD_HOST_SEGMENTS
 73
 74	/* Register usage at this point:
 75	 *
 76	 * R1         = host R1
 77	 * R2         = host R2
 78	 * R12        = exit handler id
 79	 * R13        = shadow vcpu - SHADOW_VCPU_OFF
 80	 * SVCPU.*    = guest *
 81	 * SVCPU[CR]  = guest CR
 82	 * SVCPU[XER] = guest XER
 83	 * SVCPU[CTR] = guest CTR
 84	 * SVCPU[LR]  = guest LR
 85	 *
 86	 */
 87
 88	/* Restore BATs */
 89
 90	/* We only overwrite the upper part, so we only restoree
 91	   the upper part. */
 92#define KVM_LOAD_BAT(n, reg, RA, RB)	\
 93	lwz	RA,(n*16)+0(reg);	\
 94	lwz	RB,(n*16)+4(reg);	\
 95	mtspr	SPRN_IBAT##n##U,RA;	\
 96	mtspr	SPRN_IBAT##n##L,RB;	\
 97	lwz	RA,(n*16)+8(reg);	\
 98	lwz	RB,(n*16)+12(reg);	\
 99	mtspr	SPRN_DBAT##n##U,RA;	\
100	mtspr	SPRN_DBAT##n##L,RB;	\
101
102	lis     r9, BATS@ha
103	addi    r9, r9, BATS@l
104	tophys(r9, r9)
105	KVM_LOAD_BAT(0, r9, r10, r11)
106	KVM_LOAD_BAT(1, r9, r10, r11)
107	KVM_LOAD_BAT(2, r9, r10, r11)
108	KVM_LOAD_BAT(3, r9, r10, r11)
109
110	/* Restore Segment Registers */
111
112	/* 0xc - 0xf */
113
114        li      r0, 4
115        mtctr   r0
116	LOAD_REG_IMMEDIATE(r3, 0x20000000 | (0x111 * 0xc))
117        lis     r4, 0xc000
1183:      mtsrin  r3, r4
119        addi    r3, r3, 0x111     /* increment VSID */
120        addis   r4, r4, 0x1000    /* address of next segment */
121        bdnz    3b
122
123	/* 0x0 - 0xb */
124
125	/* switch_mmu_context() needs paging, let's enable it */
126	mfmsr   r9
127	ori     r11, r9, MSR_DR
128	mtmsr   r11
129	sync
130
131	/* switch_mmu_context() clobbers r12, rescue it */
132	SAVE_GPR(12, r1)
133
134	/* Calling switch_mmu_context(<inv>, current->mm, <inv>); */
135	lwz	r4, MM(r2)
136	bl	switch_mmu_context
137
138	/* restore r12 */
139	REST_GPR(12, r1)
140
141	/* Disable paging again */
142	mfmsr   r9
143	li      r6, MSR_DR
144	andc    r9, r9, r6
145	mtmsr	r9
146	sync
147
148.endm