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42d02b81f2
There are a few key differences between doorbells on server compared with embedded that we care about on Linux, namely: - We have a new msgsndp instruction for directed privileged doorbells. msgsnd is used for directed hypervisor doorbells. - The tag we use in the instruction is the Thread Identification Register of the recipient thread (since server doorbells can only occur between threads within a single core), and is only 7 bits wide. - A new message type is introduced for server doorbells (none of the existing book3e message types are currently supported on book3s). Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Tested-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* Copyright 2009 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* provides masks and opcode images for use by code generation, emulation
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* and for instructions that older assemblers might not know about
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*/
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#ifndef _ASM_POWERPC_DBELL_H
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#define _ASM_POWERPC_DBELL_H
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <asm/ppc-opcode.h>
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#define PPC_DBELL_MSG_BRDCAST (0x04000000)
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#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
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#define PPC_DBELL_TYPE_MASK PPC_DBELL_TYPE(0xf)
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#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
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#define PPC_DBELL_PIR_MASK 0x3fff
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enum ppc_dbell {
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PPC_DBELL = 0, /* doorbell */
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PPC_DBELL_CRIT = 1, /* critical doorbell */
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PPC_G_DBELL = 2, /* guest doorbell */
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PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
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PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
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PPC_DBELL_SERVER = 5, /* doorbell on server */
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};
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#ifdef CONFIG_PPC_BOOK3S
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#define PPC_DBELL_MSGTYPE PPC_DBELL_SERVER
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#define SPRN_DOORBELL_CPUTAG SPRN_TIR
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#define PPC_DBELL_TAG_MASK 0x7f
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#else /* CONFIG_PPC_BOOK3S */
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#define PPC_DBELL_MSGTYPE PPC_DBELL
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#define SPRN_DOORBELL_CPUTAG SPRN_PIR
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#define PPC_DBELL_TAG_MASK 0x3fff
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#endif /* CONFIG_PPC_BOOK3S */
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extern void doorbell_cause_ipi(int cpu, unsigned long data);
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extern void doorbell_exception(struct pt_regs *regs);
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extern void doorbell_setup_this_cpu(void);
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static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
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{
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u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
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(tag & 0x07ffffff);
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__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
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}
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#endif /* _ASM_POWERPC_DBELL_H */
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