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>
24 #include <asm/asm-offsets.h>
25 #include <asm/exception-64s.h>
27 /*****************************************************************************
29 * Real Mode handlers that need to be in low physical memory *
31 ****************************************************************************/
34 .macro INTERRUPT_TRAMPOLINE intno
36 .global kvmppc_trampoline_\intno
37 kvmppc_trampoline_\intno:
39 mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
42 * First thing to do is to find out if we're coming
43 * from a KVM guest or a Linux process.
45 * To distinguish, we check a magic byte in the PACA
47 mfspr r13, SPRN_SPRG_PACA /* r13 = PACA */
48 std r12, (PACA_EXMC + EX_R12)(r13)
50 stw r12, (PACA_EXMC + EX_CCR)(r13)
51 lbz r12, PACA_KVM_IN_GUEST(r13)
53 bne ..kvmppc_handler_hasmagic_\intno
54 /* No KVM guest? Then jump back to the Linux handler! */
55 lwz r12, (PACA_EXMC + EX_CCR)(r13)
57 ld r12, (PACA_EXMC + EX_R12)(r13)
58 mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
59 b kvmppc_resume_\intno /* Get back original handler */
61 /* Now we know we're handling a KVM guest */
62 ..kvmppc_handler_hasmagic_\intno:
63 /* Unset guest state */
65 stb r12, PACA_KVM_IN_GUEST(r13)
67 std r1, (PACA_EXMC+EX_R9)(r13)
68 std r10, (PACA_EXMC+EX_R10)(r13)
69 std r11, (PACA_EXMC+EX_R11)(r13)
70 std r2, (PACA_EXMC+EX_R13)(r13)
75 /* Restore R1/R2 so we can handle faults */
77 ld r2, (PACA_EXMC+EX_SRR0)(r13)
79 /* Let's store which interrupt we're handling */
82 /* Jump into the SLB exit code that goes to the highmem handler */
83 b kvmppc_handler_trampoline_exit
87 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET
88 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK
89 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE
90 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_SEGMENT
91 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE
92 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_SEGMENT
93 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL
94 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT
95 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM
96 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL
97 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER
98 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL
99 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE
100 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON
101 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC
102 INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_VSX
105 * This trampoline brings us back to a real mode handler
114 .global kvmppc_handler_lowmem_trampoline
115 kvmppc_handler_lowmem_trampoline:
120 kvmppc_handler_lowmem_trampoline_end:
122 .global kvmppc_trampoline_lowmem
123 kvmppc_trampoline_lowmem:
124 .long kvmppc_handler_lowmem_trampoline - _stext
126 .global kvmppc_trampoline_enter
127 kvmppc_trampoline_enter:
128 .long kvmppc_handler_trampoline_enter - _stext
130 #include "book3s_64_slb.S"