Mailing List Archive

From: Marc Zyngier <marc.zyngier@arm.com>

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.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
arch/arm/Kconfig | 2 ++
arch/arm/Makefile | 1 +
arch/arm/mach-virt/Kconfig | 9 +++++++
arch/arm/mach-virt/Makefile | 5 ++++
arch/arm/mach-virt/virt.c | 65 +++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 82 insertions(+)
create mode 100644 arch/arm/mach-virt/Kconfig
create mode 100644 arch/arm/mach-virt/Makefile
create mode 100644 arch/arm/mach-virt/virt.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 80d54b8..3443d89 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1130,6 +1130,8 @@ 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"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 30c443c..ea4f481 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -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

diff --git a/arch/arm/mach-virt/Kconfig b/arch/arm/mach-virt/Kconfig
new file mode 100644
index 0000000..a568a2a
--- /dev/null
+++ b/arch/arm/mach-virt/Kconfig
@@ -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
diff --git a/arch/arm/mach-virt/Makefile b/arch/arm/mach-virt/Makefile
new file mode 100644
index 0000000..7ddbfa6
--- /dev/null
+++ b/arch/arm/mach-virt/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the linux kernel.
+#
+
+obj-y := virt.o
diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c
new file mode 100644
index 0000000..174b9da
--- /dev/null
+++ b/arch/arm/mach-virt/virt.c
@@ -0,0 +1,65 @@
+/*
+ * 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/of_irq.h>
+#include <linux/of_platform.h>
+
+#include <asm/arch_timer.h>
+#include <asm/hardware/gic.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+
+const static struct of_device_id irq_match[] = {
+ { .compatible = "arm,cortex-a15-gic", .data = gic_of_init, },
+ {}
+};
+
+static void __init gic_init_irq(void)
+{
+ of_irq_init(irq_match);
+}
+
+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 = gic_init_irq,
+ .handle_irq = gic_handle_irq,
+ .timer = &virt_timer,
+ .init_machine = virt_init,
+ .dt_compat = virt_dt_match,
+MACHINE_END
--
1.8.0


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