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.
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.
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.
15 * Copyright SUSE Linux Products GmbH 2009
17 * Authors: Alexander Graf <agraf@suse.de>
20 #include <asm/ppc_asm.h>
21 #include <asm/kvm_asm.h>
25 #include <asm/asm-offsets.h>
27 #ifdef CONFIG_PPC_BOOK3S_64
28 #include <asm/exception-64s.h>
31 /*****************************************************************************
33 * Real Mode handlers that need to be in low physical memory *
35 ****************************************************************************/
37 #if defined(CONFIG_PPC_BOOK3S_64)
39 #if defined(_CALL_ELF) && _CALL_ELF == 2
40 #define FUNC(name) name
42 #define FUNC(name) GLUE(.,name)
45 #elif defined(CONFIG_PPC_BOOK3S_32)
47 #define FUNC(name) name
49 .macro INTERRUPT_TRAMPOLINE intno
51 .global kvmppc_trampoline_\intno
52 kvmppc_trampoline_\intno:
54 mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
57 * First thing to do is to find out if we're coming
58 * from a KVM guest or a Linux process.
60 * To distinguish, we check a magic byte in the PACA/current
62 mfspr r13, SPRN_SPRG_THREAD
63 lwz r13, THREAD_KVM_SVCPU(r13)
64 /* PPC32 can have a NULL pointer - let's check for that */
65 mtspr SPRN_SPRG_SCRATCH1, r12 /* Save r12 */
70 mfspr r12, SPRN_SPRG_SCRATCH1
71 mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
72 b kvmppc_resume_\intno /* Get back original handler */
75 stw r12, HSTATE_SCRATCH1(r13)
76 mfspr r12, SPRN_SPRG_SCRATCH1
77 stw r12, HSTATE_SCRATCH0(r13)
78 lbz r12, HSTATE_IN_GUEST(r13)
79 cmpwi r12, KVM_GUEST_MODE_NONE
80 bne ..kvmppc_handler_hasmagic_\intno
81 /* No KVM guest? Then jump back to the Linux handler! */
82 lwz r12, HSTATE_SCRATCH1(r13)
85 /* Now we know we're handling a KVM guest */
86 ..kvmppc_handler_hasmagic_\intno:
88 /* Should we just skip the faulting instruction? */
89 cmpwi r12, KVM_GUEST_MODE_SKIP
90 beq kvmppc_handler_skip_ins
92 /* Let's store which interrupt we're handling */
95 /* Jump into the SLB exit code that goes to the highmem handler */
96 b kvmppc_handler_trampoline_exit
100 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET
101 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK
102 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE
103 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE
104 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL
105 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT
106 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM
107 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL
108 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER
109 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL
110 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE
111 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON
112 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC
115 * Bring us back to the faulting code, but skip the
116 * faulting instruction.
118 * This is a generic exit path from the interrupt
124 * R13 = Shadow VCPU (PACA)
125 * HSTATE.SCRATCH0 = guest R12
126 * HSTATE.SCRATCH1 = guest CR
127 * SPRG_SCRATCH0 = guest R13
130 kvmppc_handler_skip_ins:
132 /* Patch the IP to the next instruction */
137 /* Clean up all state */
138 lwz r12, HSTATE_SCRATCH1(r13)
140 PPC_LL r12, HSTATE_SCRATCH0(r13)
143 /* And get back into the code */
148 * Call kvmppc_handler_trampoline_enter in real mode
150 * On entry, r4 contains the guest shadow MSR
151 * MSR.EE has to be 0 when calling this function
153 _GLOBAL_TOC(kvmppc_entry_trampoline)
155 LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter)
158 li r6, MSR_IR | MSR_DR
159 andc r6, r5, r6 /* Clear DR and IR in MSR value */
161 * Set EE in HOST_MSR so that it's enabled when we get into our
162 * C exit handler function.
169 #include "book3s_segment.S"