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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright 2009 Freescale Semiconductor, Inc.
4 *
5 * provides masks and opcode images for use by code generation, emulation
6 * and for instructions that older assemblers might not know about
7 */
8#ifndef _ASM_POWERPC_DBELL_H
9#define _ASM_POWERPC_DBELL_H
10
11#include <linux/smp.h>
12#include <linux/threads.h>
13
14#include <asm/ppc-opcode.h>
15#include <asm/feature-fixups.h>
16
17#define PPC_DBELL_MSG_BRDCAST (0x04000000)
18#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
19#define PPC_DBELL_TYPE_MASK PPC_DBELL_TYPE(0xf)
20#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
21#define PPC_DBELL_PIR_MASK 0x3fff
22enum ppc_dbell {
23 PPC_DBELL = 0, /* doorbell */
24 PPC_DBELL_CRIT = 1, /* critical doorbell */
25 PPC_G_DBELL = 2, /* guest doorbell */
26 PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
27 PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
28 PPC_DBELL_SERVER = 5, /* doorbell on server */
29};
30
31#ifdef CONFIG_PPC_BOOK3S
32
33#define PPC_DBELL_MSGTYPE PPC_DBELL_SERVER
34
35static inline void _ppc_msgsnd(u32 msg)
36{
37 __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0)
38 : : "i" (CPU_FTR_HVMODE), "r" (msg));
39}
40
41/* sync before sending message */
42static inline void ppc_msgsnd_sync(void)
43{
44 __asm__ __volatile__ ("sync" : : : "memory");
45}
46
47/* sync after taking message interrupt */
48static inline void ppc_msgsync(void)
49{
50 /* sync is not required when taking messages from the same core */
51 __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSYNC " ; lwsync", "", %0)
52 : : "i" (CPU_FTR_HVMODE|CPU_FTR_ARCH_300));
53}
54
55static inline void _ppc_msgclr(u32 msg)
56{
57 __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGCLR(%1), PPC_MSGCLRP(%1), %0)
58 : : "i" (CPU_FTR_HVMODE), "r" (msg));
59}
60
61static inline void ppc_msgclr(enum ppc_dbell type)
62{
63 u32 msg = PPC_DBELL_TYPE(type);
64
65 _ppc_msgclr(msg);
66}
67
68#else /* CONFIG_PPC_BOOK3S */
69
70#define PPC_DBELL_MSGTYPE PPC_DBELL
71
72static inline void _ppc_msgsnd(u32 msg)
73{
74 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
75}
76
77/* sync before sending message */
78static inline void ppc_msgsnd_sync(void)
79{
80 __asm__ __volatile__ ("sync" : : : "memory");
81}
82
83/* sync after taking message interrupt */
84static inline void ppc_msgsync(void)
85{
86}
87
88#endif /* CONFIG_PPC_BOOK3S */
89
90extern void doorbell_global_ipi(int cpu);
91extern void doorbell_core_ipi(int cpu);
92extern int doorbell_try_core_ipi(int cpu);
93extern void doorbell_exception(struct pt_regs *regs);
94
95static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
96{
97 u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
98 (tag & 0x07ffffff);
99
100 _ppc_msgsnd(msg);
101}
102
103#endif /* _ASM_POWERPC_DBELL_H */