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Commit 2a0ba738 authored by Marc Zyngier's avatar Marc Zyngier Committed by Will Deacon
Browse files

ARM: Dummy Virtual Machine platform support 



Add support for the smallest, dumbest possible platform, to be
used as a guest for KVM or other hypervisors.

It only mandates a GIC and architected timers. Fits nicely with
a multiplatform zImage. Uses very little silicon area.

Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarNicolas Pitre <nico@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
[will: fixed up conflicts with GIC move to drivers/irqchip/]
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 6c046e40

arch/arm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -1128,6 +1128,8 @@ source "arch/arm/mach-versatile/Kconfig" 
source "arch/arm/mach-vexpress/Kconfig"

source "arch/arm/plat-versatile/Kconfig"



source "arch/arm/mach-virt/Kconfig"



source "arch/arm/mach-vt8500/Kconfig"



source "arch/arm/mach-w90x900/Kconfig"

arch/arm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -194,6 +194,7 @@ machine-$(CONFIG_ARCH_SOCFPGA) += socfpga 
machine-$(CONFIG_ARCH_SPEAR13XX)	+= spear13xx

machine-$(CONFIG_ARCH_SPEAR3XX)		+= spear3xx

machine-$(CONFIG_MACH_SPEAR600)		+= spear6xx

machine-$(CONFIG_ARCH_VIRT)		+= virt

machine-$(CONFIG_ARCH_ZYNQ)		+= zynq

machine-$(CONFIG_ARCH_SUNXI)		+= sunxi

arch/arm/mach-virt/Kconfig

0 → 100644
+9 −0
Original line number Diff line number Diff line 
config ARCH_VIRT

	bool "Dummy Virtual Machine" if ARCH_MULTI_V7

	select ARCH_WANT_OPTIONAL_GPIOLIB

	select ARM_GIC

	select ARM_ARCH_TIMER

	select HAVE_SMP

	select CPU_V7

	select SPARSE_IRQ

	select USE_OF

arch/arm/mach-virt/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
#

# Makefile for the linux kernel.

#



obj-y					:= virt.o

arch/arm/mach-virt/virt.c

0 → 100644
+54 −0
Original line number Diff line number Diff line 
/*

 * Dummy Virtual Machine - does what it says on the tin.

 *

 * Copyright (C) 2012 ARM Ltd

 * Authors: Will Deacon <will.deacon@arm.com>,

 *          Marc Zyngier <marc.zyngier@arm.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/irqchip.h>

#include <linux/of_irq.h>

#include <linux/of_platform.h>



#include <asm/arch_timer.h>

#include <asm/mach/arch.h>

#include <asm/mach/time.h>



static void __init virt_init(void)

{

	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);

}



static void __init virt_timer_init(void)

{

	WARN_ON(arch_timer_of_register() != 0);

	WARN_ON(arch_timer_sched_clock_init() != 0);

}



static const char *virt_dt_match[] = {

	"linux,dummy-virt",

	NULL

};



static struct sys_timer virt_timer = {

	.init = virt_timer_init,

};



DT_MACHINE_START(VIRT, "Dummy Virtual Machine")

	.init_irq	= irqchip_init,

	.timer		= &virt_timer,

	.init_machine	= virt_init,

	.dt_compat	= virt_dt_match,

MACHINE_END