From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?=
 <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/s390/kernel/cpcmd.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 arch/s390/kernel/cpcmd.c

(limited to 'arch/s390/kernel/cpcmd.c')

diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c
new file mode 100644
index 000000000..199ec92ef
--- /dev/null
+++ b/arch/s390/kernel/cpcmd.c
@@ -0,0 +1,113 @@
+/*
+ *  S390 version
+ *    Copyright IBM Corp. 1999, 2007
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *               Christian Borntraeger (cborntra@de.ibm.com),
+ */
+
+#define KMSG_COMPONENT "cpcmd"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <asm/ebcdic.h>
+#include <asm/cpcmd.h>
+#include <asm/io.h>
+
+static DEFINE_SPINLOCK(cpcmd_lock);
+static char cpcmd_buf[241];
+
+static int diag8_noresponse(int cmdlen)
+{
+	register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
+	register unsigned long reg3 asm ("3") = cmdlen;
+
+	asm volatile(
+		"	sam31\n"
+		"	diag	%1,%0,0x8\n"
+		"	sam64\n"
+		: "+d" (reg3) : "d" (reg2) : "cc");
+	return reg3;
+}
+
+static int diag8_response(int cmdlen, char *response, int *rlen)
+{
+	register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
+	register unsigned long reg3 asm ("3") = (addr_t) response;
+	register unsigned long reg4 asm ("4") = cmdlen | 0x40000000L;
+	register unsigned long reg5 asm ("5") = *rlen;
+
+	asm volatile(
+		"	sam31\n"
+		"	diag	%2,%0,0x8\n"
+		"	sam64\n"
+		"	brc	8,1f\n"
+		"	agr	%1,%4\n"
+		"1:\n"
+		: "+d" (reg4), "+d" (reg5)
+		: "d" (reg2), "d" (reg3), "d" (*rlen) : "cc");
+	*rlen = reg5;
+	return reg4;
+}
+
+/*
+ * __cpcmd has some restrictions over cpcmd
+ *  - the response buffer must reside below 2GB (if any)
+ *  - __cpcmd is unlocked and therefore not SMP-safe
+ */
+int  __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
+{
+	int cmdlen;
+	int rc;
+	int response_len;
+
+	cmdlen = strlen(cmd);
+	BUG_ON(cmdlen > 240);
+	memcpy(cpcmd_buf, cmd, cmdlen);
+	ASCEBC(cpcmd_buf, cmdlen);
+
+	if (response) {
+		memset(response, 0, rlen);
+		response_len = rlen;
+		rc = diag8_response(cmdlen, response, &rlen);
+		EBCASC(response, response_len);
+        } else {
+		rc = diag8_noresponse(cmdlen);
+        }
+	if (response_code)
+		*response_code = rc;
+	return rlen;
+}
+EXPORT_SYMBOL(__cpcmd);
+
+int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
+{
+	char *lowbuf;
+	int len;
+	unsigned long flags;
+
+	if ((virt_to_phys(response) != (unsigned long) response) ||
+			(((unsigned long)response + rlen) >> 31)) {
+		lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
+		if (!lowbuf) {
+			pr_warning("The cpcmd kernel function failed to "
+				   "allocate a response buffer\n");
+			return -ENOMEM;
+		}
+		spin_lock_irqsave(&cpcmd_lock, flags);
+		len = __cpcmd(cmd, lowbuf, rlen, response_code);
+		spin_unlock_irqrestore(&cpcmd_lock, flags);
+		memcpy(response, lowbuf, rlen);
+		kfree(lowbuf);
+	} else {
+		spin_lock_irqsave(&cpcmd_lock, flags);
+		len = __cpcmd(cmd, response, rlen, response_code);
+		spin_unlock_irqrestore(&cpcmd_lock, flags);
+	}
+	return len;
+}
+EXPORT_SYMBOL(cpcmd);
-- 
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