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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mn10300/kernel/smp-low.S
10817 views
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/* SMP IPI low-level handler

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 *

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 * Copyright (C) 2006-2007 Matsushita Electric Industrial Co., Ltd.

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 * All Rights Reserved.

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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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 */

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#include <linux/sys.h>

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#include <linux/linkage.h>

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#include <asm/smp.h>

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#include <asm/system.h>

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#include <asm/thread_info.h>

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#include <asm/cpu-regs.h>

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#include <proc/smp-regs.h>

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#include <asm/asm-offsets.h>

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#include <asm/frame.inc>

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	.am33_2

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###############################################################################

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#

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# IPI interrupt handler

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#

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###############################################################################

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	.globl mn10300_low_ipi_handler

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mn10300_low_ipi_handler:

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	add	-4,sp

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	mov	d0,(sp)

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	movhu	(IAGR),d0

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	and	IAGR_GN,d0

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	lsr	0x2,d0

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#ifdef CONFIG_MN10300_CACHE_ENABLED

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	cmp	FLUSH_CACHE_IPI,d0

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	beq	mn10300_flush_cache_ipi

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#endif

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	cmp	SMP_BOOT_IRQ,d0

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	beq	mn10300_smp_boot_ipi

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	/* OTHERS */

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	mov	(sp),d0

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	add	4,sp

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#ifdef CONFIG_GDBSTUB

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	jmp	gdbstub_io_rx_handler

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#else

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	jmp	end

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#endif

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###############################################################################

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#

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# Cache flush IPI interrupt handler

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#

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###############################################################################

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#ifdef CONFIG_MN10300_CACHE_ENABLED

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mn10300_flush_cache_ipi:

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	mov	(sp),d0

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	add	4,sp

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	/* FLUSH_CACHE_IPI */

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	add	-4,sp

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	SAVE_ALL

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	mov	GxICR_DETECT,d2

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	movbu	d2,(GxICR(FLUSH_CACHE_IPI))	# ACK the interrupt

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	movhu	(GxICR(FLUSH_CACHE_IPI)),d2

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	call	smp_cache_interrupt[],0

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	RESTORE_ALL

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	jmp	end

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#endif

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###############################################################################

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#

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# SMP boot CPU IPI interrupt handler

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#

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###############################################################################

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mn10300_smp_boot_ipi:

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	/* clear interrupt */

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	movhu	(GxICR(SMP_BOOT_IRQ)),d0

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	and	~GxICR_REQUEST,d0

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	movhu	d0,(GxICR(SMP_BOOT_IRQ))

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	mov	(sp),d0

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	add	4,sp

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	# get stack

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	mov	(CPUID),a0

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	add	-1,a0

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	add	a0,a0

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	add	a0,a0

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	mov	(start_stack,a0),a0

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	mov	a0,sp

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	jmp	initialize_secondary

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# Jump here after RTI to suppress the icache lookahead

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end:

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