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
58BEGIN_FTR_SECTION
59	mtocrf	0x80, r11	/* check MSR[GS] without clobbering reg */
60	bf	3, 1975f
61	b	kvmppc_handler_\intno\()_\srr1
621975:
63END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
64#endif
65.endm
66
67#endif /*__ASSEMBLY__ */
68#endif /* ASM_KVM_BOOKE_HV_ASM_H */
69