arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / powerpc / kvm / book3s_rmhandlers.S
blob3dc129a254b5e67da137f063adf0b6612d19cd6b
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  */
9 #include <asm/ppc_asm.h>
10 #include <asm/kvm_asm.h>
11 #include <asm/reg.h>
12 #include <asm/mmu.h>
13 #include <asm/page.h>
14 #include <asm/asm-offsets.h>
15 #include <asm/asm-compat.h>
17 #ifdef CONFIG_PPC_BOOK3S_64
18 #include <asm/exception-64s.h>
19 #endif
21 /*****************************************************************************
22  *                                                                           *
23  *        Real Mode handlers that need to be in low physical memory          *
24  *                                                                           *
25  ****************************************************************************/
27 #if defined(CONFIG_PPC_BOOK3S_64)
29 #ifdef PPC64_ELF_ABI_v2
30 #define FUNC(name)              name
31 #else
32 #define FUNC(name)              GLUE(.,name)
33 #endif
35 #elif defined(CONFIG_PPC_BOOK3S_32)
37 #define FUNC(name)              name
39 #define RFI_TO_KERNEL   RFI
40 #define RFI_TO_GUEST    RFI
42 .macro INTERRUPT_TRAMPOLINE intno
44 .global kvmppc_trampoline_\intno
45 kvmppc_trampoline_\intno:
47         mtspr   SPRN_SPRG_SCRATCH0, r13         /* Save r13 */
49         /*
50          * First thing to do is to find out if we're coming
51          * from a KVM guest or a Linux process.
52          *
53          * To distinguish, we check a magic byte in the PACA/current
54          */
55         mfspr   r13, SPRN_SPRG_THREAD
56         lwz     r13, THREAD_KVM_SVCPU(r13)
57         /* PPC32 can have a NULL pointer - let's check for that */
58         mtspr   SPRN_SPRG_SCRATCH1, r12         /* Save r12 */
59         mfcr    r12
60         cmpwi   r13, 0
61         bne     1f
62 2:      mtcr    r12
63         mfspr   r12, SPRN_SPRG_SCRATCH1
64         mfspr   r13, SPRN_SPRG_SCRATCH0         /* r13 = original r13 */
65         b       kvmppc_resume_\intno            /* Get back original handler */
67 1:      tophys(r13, r13)
68         stw     r12, HSTATE_SCRATCH1(r13)
69         mfspr   r12, SPRN_SPRG_SCRATCH1
70         stw     r12, HSTATE_SCRATCH0(r13)
71         lbz     r12, HSTATE_IN_GUEST(r13)
72         cmpwi   r12, KVM_GUEST_MODE_NONE
73         bne     ..kvmppc_handler_hasmagic_\intno
74         /* No KVM guest? Then jump back to the Linux handler! */
75         lwz     r12, HSTATE_SCRATCH1(r13)
76         b       2b
78         /* Now we know we're handling a KVM guest */
79 ..kvmppc_handler_hasmagic_\intno:
81         /* Should we just skip the faulting instruction? */
82         cmpwi   r12, KVM_GUEST_MODE_SKIP
83         beq     kvmppc_handler_skip_ins
85         /* Let's store which interrupt we're handling */
86         li      r12, \intno
88         /* Jump into the SLB exit code that goes to the highmem handler */
89         b       kvmppc_handler_trampoline_exit
91 .endm
93 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_SYSTEM_RESET
94 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_MACHINE_CHECK
95 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_DATA_STORAGE
96 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_INST_STORAGE
97 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_EXTERNAL
98 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_ALIGNMENT
99 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_PROGRAM
100 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_FP_UNAVAIL
101 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_DECREMENTER
102 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_SYSCALL
103 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_TRACE
104 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_PERFMON
105 INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_ALTIVEC
108  * Bring us back to the faulting code, but skip the
109  * faulting instruction.
111  * This is a generic exit path from the interrupt
112  * trampolines above.
114  * Input Registers:
116  * R12            = free
117  * R13            = Shadow VCPU (PACA)
118  * HSTATE.SCRATCH0 = guest R12
119  * HSTATE.SCRATCH1 = guest CR
120  * SPRG_SCRATCH0  = guest R13
122  */
123 kvmppc_handler_skip_ins:
125         /* Patch the IP to the next instruction */
126         mfsrr0  r12
127         addi    r12, r12, 4
128         mtsrr0  r12
130         /* Clean up all state */
131         lwz     r12, HSTATE_SCRATCH1(r13)
132         mtcr    r12
133         PPC_LL  r12, HSTATE_SCRATCH0(r13)
134         GET_SCRATCH0(r13)
136         /* And get back into the code */
137         RFI_TO_KERNEL
138 #endif
141  * Call kvmppc_handler_trampoline_enter in real mode
143  * On entry, r4 contains the guest shadow MSR
144  * MSR.EE has to be 0 when calling this function
145  */
146 _GLOBAL_TOC(kvmppc_entry_trampoline)
147         mfmsr   r5
148         LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter)
149         toreal(r7)
151         li      r6, MSR_IR | MSR_DR
152         andc    r6, r5, r6      /* Clear DR and IR in MSR value */
153         /*
154          * Set EE in HOST_MSR so that it's enabled when we get into our
155          * C exit handler function.
156          */
157         ori     r5, r5, MSR_EE
158         mtsrr0  r7
159         mtsrr1  r6
160         RFI_TO_KERNEL
162 #include "book3s_segment.S"