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linux-next/arch/powerpc/include/asm/dbell.h
Alexander Graf 4ab969199e KVM: PPC: e500mc: Add doorbell emulation support
When one vcpu wants to kick another, it can issue a special IPI instruction
called msgsnd. This patch emulates this instruction, its clearing counterpart
and the infrastructure required to actually trigger that interrupt inside
a guest vcpu.

With this patch, SMP guests on e500mc work.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2012-04-08 12:54:50 +03:00

46 lines
1.4 KiB
C

/*
* Copyright 2009 Freescale Semicondutor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* provides masks and opcode images for use by code generation, emulation
* and for instructions that older assemblers might not know about
*/
#ifndef _ASM_POWERPC_DBELL_H
#define _ASM_POWERPC_DBELL_H
#include <linux/smp.h>
#include <linux/threads.h>
#include <asm/ppc-opcode.h>
#define PPC_DBELL_MSG_BRDCAST (0x04000000)
#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
#define PPC_DBELL_TYPE_MASK PPC_DBELL_TYPE(0xf)
#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
#define PPC_DBELL_PIR_MASK 0x3fff
enum ppc_dbell {
PPC_DBELL = 0, /* doorbell */
PPC_DBELL_CRIT = 1, /* critical doorbell */
PPC_G_DBELL = 2, /* guest doorbell */
PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
};
extern void doorbell_cause_ipi(int cpu, unsigned long data);
extern void doorbell_exception(struct pt_regs *regs);
extern void doorbell_setup_this_cpu(void);
static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
{
u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
(tag & 0x07ffffff);
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
}
#endif /* _ASM_POWERPC_DBELL_H */