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Diffstat (limited to 'arch/powerpc/kernel/dbell.c')
| -rw-r--r-- | arch/powerpc/kernel/dbell.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c new file mode 100644 index 00000000..2cc451aa --- /dev/null +++ b/arch/powerpc/kernel/dbell.c @@ -0,0 +1,51 @@ +/* + * Author: Kumar Gala <galak@kernel.crashing.org> + * + * Copyright 2009 Freescale Semiconductor 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. + */ + +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/smp.h> +#include <linux/threads.h> +#include <linux/hardirq.h> + +#include <asm/dbell.h> +#include <asm/irq_regs.h> + +#ifdef CONFIG_SMP +void doorbell_setup_this_cpu(void) +{ + unsigned long tag = mfspr(SPRN_PIR) & 0x3fff; + + smp_muxed_ipi_set_data(smp_processor_id(), tag); +} + +void doorbell_cause_ipi(int cpu, unsigned long data) +{ + ppc_msgsnd(PPC_DBELL, 0, data); +} + +void doorbell_exception(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + irq_enter(); + + smp_ipi_demux(); + + irq_exit(); + set_irq_regs(old_regs); +} +#else /* CONFIG_SMP */ +void doorbell_exception(struct pt_regs *regs) +{ + printk(KERN_WARNING "Received doorbell on non-smp system\n"); +} +#endif /* CONFIG_SMP */ + |