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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: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
[will: fixed up conflicts with GIC move to drivers/irqchip/]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Marc Zyngier 2012-10-05 13:47:39 +01:00 committed by Will Deacon
parent 6c046e4055
commit 2a0ba73880
5 changed files with 71 additions and 0 deletions
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2
arch/arm/Kconfig
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@ -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"

1
arch/arm/Makefile
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@ -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

9
arch/arm/mach-virt/Kconfig Normal file
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@ -0,0 +1,9 @@
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

5
arch/arm/mach-virt/Makefile Normal file
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@ -0,0 +1,5 @@
#
# Makefile for the linux kernel.
#
obj-y := virt.o

54
arch/arm/mach-virt/virt.c Normal file
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@ -0,0 +1,54 @@
/*
* 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