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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/s390/char/vmcp.h
Initial import
Diffstat (limited to 'drivers/s390/char/vmcp.h')
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diff --git a/drivers/s390/char/vmcp.h b/drivers/s390/char/vmcp.h
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+/*
+ * Copyright IBM Corp. 2004, 2005
+ * Interface implementation for communication with the z/VM control program
+ * Version 1.0
+ * Author(s): Christian Borntraeger <cborntra@de.ibm.com>
+ *
+ *
+ * z/VMs CP offers the possibility to issue commands via the diagnose code 8
+ * this driver implements a character device that issues these commands and
+ * returns the answer of CP.
+ *
+ * The idea of this driver is based on cpint from Neale Ferguson
+ */
+
+#include <linux/ioctl.h>
+#include <linux/mutex.h>
+
+#define VMCP_GETCODE _IOR(0x10, 1, int)
+#define VMCP_SETBUF _IOW(0x10, 2, int)
+#define VMCP_GETSIZE _IOR(0x10, 3, int)
+
+struct vmcp_session {
+ unsigned int bufsize;
+ char *response;
+ int resp_size;
+ int resp_code;
+ /* As we use copy_from/to_user, which might *
+ * sleep and cannot use a spinlock */
+ struct mutex mutex;
+};