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authorRalf Baechle <ralf@linux-mips.org>2006-02-15 15:17:19 +0000
committerRalf Baechle <ralf@linux-mips.org>2006-03-21 13:27:45 +0000
commitc1449c8fa40859eb269025a7db85b34115205f5b (patch)
treef92bf4d9544aec45b978ed8e3f638018054b3a5c /arch
parent37caa934af02bc01d0e1366a49e1c89360fa0f29 (diff)
[MIPS] Symmetric Uniprocessor support for Qemu.
SMP bits needed to builds and run an SMP kernel. While only a single processor is supported ATM it's still useful for some SMP debugging using Qemu. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/Kconfig2
-rw-r--r--arch/mips/qemu/Makefile2
-rw-r--r--arch/mips/qemu/q-smp.c48
3 files changed, 51 insertions, 1 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 9d1e78f9c06..6356f7d52ce 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1582,7 +1582,7 @@ source "mm/Kconfig"
config SMP
bool "Multi-Processing support"
- depends on CPU_RM9000 || ((SIBYTE_BCM1x80 || SIBYTE_BCM1x55 || SIBYTE_SB1250) && !SIBYTE_STANDALONE) || SGI_IP27 || MIPS_MT_SMP
+ depends on CPU_RM9000 || ((SIBYTE_BCM1x80 || SIBYTE_BCM1x55 || SIBYTE_SB1250 || QEMU) && !SIBYTE_STANDALONE) || SGI_IP27 || MIPS_MT_SMP
---help---
This enables support for systems with more than one CPU. If you have
a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/mips/qemu/Makefile b/arch/mips/qemu/Makefile
index 934944ab9e8..6a8e8bcef55 100644
--- a/arch/mips/qemu/Makefile
+++ b/arch/mips/qemu/Makefile
@@ -3,3 +3,5 @@
#
obj-y = q-firmware.o q-int.o q-irq.o q-mem.o q-setup.o
+
+obj-$(CONFIG_SMP) += q-smp.o
diff --git a/arch/mips/qemu/q-smp.c b/arch/mips/qemu/q-smp.c
new file mode 100644
index 00000000000..5a12354cd57
--- /dev/null
+++ b/arch/mips/qemu/q-smp.c
@@ -0,0 +1,48 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 by Ralf Baechle (ralf@linux-mips.org)
+ *
+ * Symmetric Uniprocessor (TM) Support
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+/*
+ * Send inter-processor interrupt
+ */
+void core_send_ipi(int cpu, unsigned int action)
+{
+ panic(KERN_ERR "%s called", __FUNCTION__);
+}
+
+/*
+ * After we've done initial boot, this function is called to allow the
+ * board code to clean up state, if needed
+ */
+void prom_init_secondary(void)
+{
+}
+
+void prom_smp_finish(void)
+{
+}
+
+/* Hook for after all CPUs are online */
+void prom_cpus_done(void)
+{
+}
+
+void __init prom_prepare_cpus(unsigned int max_cpus)
+{
+ cpus_clear(phys_cpu_present_map);
+}
+
+/*
+ * Firmware CPU startup hook
+ */
+void prom_boot_secondary(int cpu, struct task_struct *idle)
+{
+}