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Diffstat (limited to 'arch/s390/kernel/cpcmd.c')
-rw-r--r--arch/s390/kernel/cpcmd.c100
1 files changed, 55 insertions, 45 deletions
diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c
index 6c89f30c8e3..d8c1131e081 100644
--- a/arch/s390/kernel/cpcmd.c
+++ b/arch/s390/kernel/cpcmd.c
@@ -2,7 +2,7 @@
* arch/s390/kernel/cpcmd.c
*
* S390 version
- * Copyright (C) 1999,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright IBM Corp. 1999,2007
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Christian Borntraeger (cborntra@de.ibm.com),
*/
@@ -21,6 +21,49 @@
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(
+#ifndef CONFIG_64BIT
+ " diag %1,%0,0x8\n"
+#else /* CONFIG_64BIT */
+ " sam31\n"
+ " diag %1,%0,0x8\n"
+ " sam64\n"
+#endif /* CONFIG_64BIT */
+ : "+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(
+#ifndef CONFIG_64BIT
+ " diag %2,%0,0x8\n"
+ " brc 8,1f\n"
+ " ar %1,%4\n"
+#else /* CONFIG_64BIT */
+ " sam31\n"
+ " diag %2,%0,0x8\n"
+ " sam64\n"
+ " brc 8,1f\n"
+ " agr %1,%4\n"
+#endif /* CONFIG_64BIT */
+ "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)
@@ -28,59 +71,27 @@ static char cpcmd_buf[241];
*/
int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
{
- unsigned cmdlen;
- int return_code, return_len;
+ 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 != NULL && rlen > 0) {
- 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;
-
+ if (response) {
memset(response, 0, rlen);
- asm volatile(
-#ifndef CONFIG_64BIT
- " diag %2,%0,0x8\n"
- " brc 8,1f\n"
- " ar %1,%4\n"
-#else /* CONFIG_64BIT */
- " sam31\n"
- " diag %2,%0,0x8\n"
- " sam64\n"
- " brc 8,1f\n"
- " agr %1,%4\n"
-#endif /* CONFIG_64BIT */
- "1:\n"
- : "+d" (reg4), "+d" (reg5)
- : "d" (reg2), "d" (reg3), "d" (rlen) : "cc");
- return_code = (int) reg4;
- return_len = (int) reg5;
- EBCASC(response, rlen);
+ response_len = rlen;
+ rc = diag8_response(cmdlen, response, &rlen);
+ EBCASC(response, response_len);
} else {
- register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
- register unsigned long reg3 asm ("3") = cmdlen;
- return_len = 0;
- asm volatile(
-#ifndef CONFIG_64BIT
- " diag %1,%0,0x8\n"
-#else /* CONFIG_64BIT */
- " sam31\n"
- " diag %1,%0,0x8\n"
- " sam64\n"
-#endif /* CONFIG_64BIT */
- : "+d" (reg3) : "d" (reg2) : "cc");
- return_code = (int) reg3;
+ rc = diag8_noresponse(cmdlen);
}
- if (response_code != NULL)
- *response_code = return_code;
- return return_len;
+ if (response_code)
+ *response_code = rc;
+ return rlen;
}
-
EXPORT_SYMBOL(__cpcmd);
int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
@@ -109,5 +120,4 @@ int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
}
return len;
}
-
EXPORT_SYMBOL(cpcmd);