aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/book3s_64_rmhandlers.S
blob: fb7dd2e9ac8863fdfc48be3088cd73dcb6337df4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
 * 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/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>

/*****************************************************************************
 *                                                                           *
 *        Real Mode handlers that need to be in low physical memory          *
 *                                                                           *
 ****************************************************************************/


.macro INTERRUPT_TRAMPOLINE intno

.global kvmppc_trampoline_\intno
kvmppc_trampoline_\intno:

	mtspr	SPRN_SPRG_SCRATCH0, r13		/* Save r13 */

	/*
	 * First thing to do is to find out if we're coming
	 * from a KVM guest or a Linux process.
	 *
	 * To distinguish, we check a magic byte in the PACA
	 */
	mfspr	r13, SPRN_SPRG_PACA		/* r13 = PACA */
	std	r12, (PACA_EXMC + EX_R12)(r13)
	mfcr	r12
	stw	r12, (PACA_EXMC + EX_CCR)(r13)
	lbz	r12, PACA_KVM_IN_GUEST(r13)
	cmpwi	r12, 0
	bne	..kvmppc_handler_hasmagic_\intno
	/* No KVM guest? Then jump back to the Linux handler! */
	lwz	r12, (PACA_EXMC + EX_CCR)(r13)
	mtcr	r12
	ld	r12, (PACA_EXMC + EX_R12)(r13)
	mfspr	r13, SPRN_SPRG_SCRATCH0		/* r13 = original r13 */
	b	kvmppc_resume_\intno		/* Get back original handler */

	/* Now we know we're handling a KVM guest */
..kvmppc_handler_hasmagic_\intno:
	/* Unset guest state */
	li	r12, 0
	stb	r12, PACA_KVM_IN_GUEST(r13)

	std	r1, (PACA_EXMC+EX_R9)(r13)
	std	r10, (PACA_EXMC+EX_R10)(r13)
	std	r11, (PACA_EXMC+EX_R11)(r13)
	std	r2, (PACA_EXMC+EX_R13)(r13)

	mfsrr0	r10
	mfsrr1	r11

	/* Restore R1/R2 so we can handle faults */
	ld	r1, PACAR1(r13)
	ld	r2, (PACA_EXMC+EX_SRR0)(r13)

	/* Let's store which interrupt we're handling */
	li	r12, \intno

	/* Jump into the SLB exit code that goes to the highmem handler */
	b	kvmppc_handler_trampoline_exit

.endm

INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_SYSTEM_RESET
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_MACHINE_CHECK
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_DATA_STORAGE
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_DATA_SEGMENT
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_INST_STORAGE
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_INST_SEGMENT
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_EXTERNAL
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_ALIGNMENT
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_PROGRAM
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_FP_UNAVAIL
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_DECREMENTER
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_SYSCALL
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_TRACE
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_PERFMON
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_ALTIVEC
INTERRUPT_TRAMPOLINE	BOOK3S_INTERRUPT_VSX

/*
 * This trampoline brings us back to a real mode handler
 *
 * Input Registers:
 *
 * R6 = SRR0
 * R7 = SRR1
 * LR = real-mode IP
 *
 */
.global kvmppc_handler_lowmem_trampoline
kvmppc_handler_lowmem_trampoline:

	mtsrr0	r6
	mtsrr1	r7
	blr
kvmppc_handler_lowmem_trampoline_end:

.global kvmppc_trampoline_lowmem
kvmppc_trampoline_lowmem:
	.long kvmppc_handler_lowmem_trampoline - _stext

.global kvmppc_trampoline_enter
kvmppc_trampoline_enter:
	.long kvmppc_handler_trampoline_enter - _stext

#include "book3s_64_slb.S"