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-rw-r--r--kernel/up.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/kernel/up.c b/kernel/up.c
new file mode 100644
index 0000000000..a38b8b0952
--- /dev/null
+++ b/kernel/up.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Uniprocessor-only support functions. The counterpart to kernel/smp.c
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/smp.h>
+#include <linux/hypervisor.h>
+
+int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
+ int wait)
+{
+ unsigned long flags;
+
+ if (cpu != 0)
+ return -ENXIO;
+
+ local_irq_save(flags);
+ func(info);
+ local_irq_restore(flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(smp_call_function_single);
+
+int smp_call_function_single_async(int cpu, struct __call_single_data *csd)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ csd->func(csd->info);
+ local_irq_restore(flags);
+ return 0;
+}
+EXPORT_SYMBOL(smp_call_function_single_async);
+
+/*
+ * Preemption is disabled here to make sure the cond_func is called under the
+ * same conditions in UP and SMP.
+ */
+void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
+ void *info, bool wait, const struct cpumask *mask)
+{
+ unsigned long flags;
+
+ preempt_disable();
+ if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) {
+ local_irq_save(flags);
+ func(info);
+ local_irq_restore(flags);
+ }
+ preempt_enable();
+}
+EXPORT_SYMBOL(on_each_cpu_cond_mask);
+
+int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
+{
+ int ret;
+
+ if (cpu != 0)
+ return -ENXIO;
+
+ if (phys)
+ hypervisor_pin_vcpu(0);
+ ret = func(par);
+ if (phys)
+ hypervisor_pin_vcpu(-1);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(smp_call_on_cpu);