1 /*
2  * Copyright 2010-2011 Freescale Semiconductor, Inc.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License, version 2, as
6  * published by the Free Software Foundation.
7  */
8 
9 #ifndef ASM_KVM_BOOKE_HV_ASM_H
10 #define ASM_KVM_BOOKE_HV_ASM_H
11 
12 #ifdef __ASSEMBLY__
13 
14 /*
15  * All exceptions from guest state must go through KVM
16  * (except for those which are delivered directly to the guest) --
17  * there are no exceptions for which we fall through directly to
18  * the normal host handler.
19  *
20  * 32-bit host
21  * Expected inputs (normal exceptions):
22  *   SCRATCH0 = saved r10
23  *   r10 = thread struct
24  *   r11 = appropriate SRR1 variant (currently used as scratch)
25  *   r13 = saved CR
26  *   *(r10 + THREAD_NORMSAVE(0)) = saved r11
27  *   *(r10 + THREAD_NORMSAVE(2)) = saved r13
28  *
29  * Expected inputs (crit/mcheck/debug exceptions):
30  *   appropriate SCRATCH = saved r8
31  *   r8 = exception level stack frame
32  *   r9 = *(r8 + _CCR) = saved CR
33  *   r11 = appropriate SRR1 variant (currently used as scratch)
34  *   *(r8 + GPR9) = saved r9
35  *   *(r8 + GPR10) = saved r10 (r10 not yet clobbered)
36  *   *(r8 + GPR11) = saved r11
37  *
38  * 64-bit host
39  * Expected inputs (GEN/GDBELL/DBG/CRIT/MC exception types):
40  *  r10 = saved CR
41  *  r13 = PACA_POINTER
42  *  *(r13 + PACA_EX##type + EX_R10) = saved r10
43  *  *(r13 + PACA_EX##type + EX_R11) = saved r11
44  *  SPRN_SPRG_##type##_SCRATCH = saved r13
45  *
46  * Expected inputs (TLB exception type):
47  *  r10 = saved CR
48  *  r12 = extlb pointer
49  *  r13 = PACA_POINTER
50  *  *(r12 + EX_TLB_R10) = saved r10
51  *  *(r12 + EX_TLB_R11) = saved r11
52  *  *(r12 + EX_TLB_R13) = saved r13
53  *  SPRN_SPRG_GEN_SCRATCH = saved r12
54  *
55  * Only the bolted version of TLB miss exception handlers is supported now.
56  */
57 .macro DO_KVM intno srr1
58 #ifdef CONFIG_KVM_BOOKE_HV
59 BEGIN_FTR_SECTION
60 	mtocrf	0x80, r11	/* check MSR[GS] without clobbering reg */
61 	bf	3, 1975f
62 	b	kvmppc_handler_\intno\()_\srr1
63 1975:
64 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
65 #endif
66 .endm
67 
68 #endif /*__ASSEMBLY__ */
69 #endif /* ASM_KVM_BOOKE_HV_ASM_H */
70