1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright 2010-2011 Freescale Semiconductor, Inc.
4  */
5 
6 #ifndef ASM_KVM_BOOKE_HV_ASM_H
7 #define ASM_KVM_BOOKE_HV_ASM_H
8 
9 #include <asm/feature-fixups.h>
10 
11 #ifdef __ASSEMBLY__
12 
13 /*
14  * All exceptions from guest state must go through KVM
15  * (except for those which are delivered directly to the guest) --
16  * there are no exceptions for which we fall through directly to
17  * the normal host handler.
18  *
19  * 32-bit host
20  * Expected inputs (normal exceptions):
21  *   SCRATCH0 = saved r10
22  *   r10 = thread struct
23  *   r11 = appropriate SRR1 variant (currently used as scratch)
24  *   r13 = saved CR
25  *   *(r10 + THREAD_NORMSAVE(0)) = saved r11
26  *   *(r10 + THREAD_NORMSAVE(2)) = saved r13
27  *
28  * Expected inputs (crit/mcheck/debug exceptions):
29  *   appropriate SCRATCH = saved r8
30  *   r8 = exception level stack frame
31  *   r9 = *(r8 + _CCR) = saved CR
32  *   r11 = appropriate SRR1 variant (currently used as scratch)
33  *   *(r8 + GPR9) = saved r9
34  *   *(r8 + GPR10) = saved r10 (r10 not yet clobbered)
35  *   *(r8 + GPR11) = saved r11
36  *
37  * 64-bit host
38  * Expected inputs (GEN/GDBELL/DBG/CRIT/MC exception types):
39  *  r10 = saved CR
40  *  r13 = PACA_POINTER
41  *  *(r13 + PACA_EX##type + EX_R10) = saved r10
42  *  *(r13 + PACA_EX##type + EX_R11) = saved r11
43  *  SPRN_SPRG_##type##_SCRATCH = saved r13
44  *
45  * Expected inputs (TLB exception type):
46  *  r10 = saved CR
47  *  r12 = extlb pointer
48  *  r13 = PACA_POINTER
49  *  *(r12 + EX_TLB_R10) = saved r10
50  *  *(r12 + EX_TLB_R11) = saved r11
51  *  *(r12 + EX_TLB_R13) = saved r13
52  *  SPRN_SPRG_GEN_SCRATCH = saved r12
53  *
54  * Only the bolted version of TLB miss exception handlers is supported now.
55  */
56 .macro DO_KVM intno srr1
57 #ifdef CONFIG_KVM_BOOKE_HV
58 BEGIN_FTR_SECTION
59 	mtocrf	0x80, r11	/* check MSR[GS] without clobbering reg */
60 	bf	3, 1975f
61 	b	kvmppc_handler_\intno\()_\srr1
62 1975:
63 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
64 #endif
65 .endm
66 
67 #endif /*__ASSEMBLY__ */
68 #endif /* ASM_KVM_BOOKE_HV_ASM_H */
69