[PATCH] s390: add vmcp interface
Add interface to issue VM control program commands.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c
index 44df8dc..2006214 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) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright (C) 1999,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Christian Borntraeger (cborntra@de.ibm.com),
*/
@@ -18,93 +18,114 @@
#include <asm/system.h>
static DEFINE_SPINLOCK(cpcmd_lock);
-static char cpcmd_buf[240];
+static char cpcmd_buf[241];
/*
* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
*/
-void __cpcmd(char *cmd, char *response, int rlen)
+int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
{
const int mask = 0x40000000L;
unsigned long flags;
+ int return_code;
+ int return_len;
int cmdlen;
spin_lock_irqsave(&cpcmd_lock, flags);
cmdlen = strlen(cmd);
BUG_ON(cmdlen > 240);
- strcpy(cpcmd_buf, cmd);
+ memcpy(cpcmd_buf, cmd, cmdlen);
ASCEBC(cpcmd_buf, cmdlen);
if (response != NULL && rlen > 0) {
memset(response, 0, rlen);
#ifndef CONFIG_ARCH_S390X
- asm volatile ("LRA 2,0(%0)\n\t"
- "LR 4,%1\n\t"
- "O 4,%4\n\t"
- "LRA 3,0(%2)\n\t"
- "LR 5,%3\n\t"
- ".long 0x83240008 # Diagnose X'08'\n\t"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen),
- "a" (response), "d" (rlen), "m" (mask)
- : "cc", "2", "3", "4", "5" );
+ asm volatile ( "lra 2,0(%2)\n"
+ "lr 4,%3\n"
+ "o 4,%6\n"
+ "lra 3,0(%4)\n"
+ "lr 5,%5\n"
+ "diag 2,4,0x8\n"
+ "brc 8, .Litfits\n"
+ "ar 5, %5\n"
+ ".Litfits: \n"
+ "lr %0,4\n"
+ "lr %1,5\n"
+ : "=d" (return_code), "=d" (return_len)
+ : "a" (cpcmd_buf), "d" (cmdlen),
+ "a" (response), "d" (rlen), "m" (mask)
+ : "cc", "2", "3", "4", "5" );
#else /* CONFIG_ARCH_S390X */
- asm volatile (" lrag 2,0(%0)\n"
- " lgr 4,%1\n"
- " o 4,%4\n"
- " lrag 3,0(%2)\n"
- " lgr 5,%3\n"
- " sam31\n"
- " .long 0x83240008 # Diagnose X'08'\n"
- " sam64"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen),
- "a" (response), "d" (rlen), "m" (mask)
- : "cc", "2", "3", "4", "5" );
+ asm volatile ( "lrag 2,0(%2)\n"
+ "lgr 4,%3\n"
+ "o 4,%6\n"
+ "lrag 3,0(%4)\n"
+ "lgr 5,%5\n"
+ "sam31\n"
+ "diag 2,4,0x8\n"
+ "sam64\n"
+ "brc 8, .Litfits\n"
+ "agr 5, %5\n"
+ ".Litfits: \n"
+ "lgr %0,4\n"
+ "lgr %1,5\n"
+ : "=d" (return_code), "=d" (return_len)
+ : "a" (cpcmd_buf), "d" (cmdlen),
+ "a" (response), "d" (rlen), "m" (mask)
+ : "cc", "2", "3", "4", "5" );
#endif /* CONFIG_ARCH_S390X */
EBCASC(response, rlen);
} else {
+ return_len = 0;
#ifndef CONFIG_ARCH_S390X
- asm volatile ("LRA 2,0(%0)\n\t"
- "LR 3,%1\n\t"
- ".long 0x83230008 # Diagnose X'08'\n\t"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen)
- : "2", "3" );
+ asm volatile ( "lra 2,0(%1)\n"
+ "lr 3,%2\n"
+ "diag 2,3,0x8\n"
+ "lr %0,3\n"
+ : "=d" (return_code)
+ : "a" (cpcmd_buf), "d" (cmdlen)
+ : "2", "3" );
#else /* CONFIG_ARCH_S390X */
- asm volatile (" lrag 2,0(%0)\n"
- " lgr 3,%1\n"
- " sam31\n"
- " .long 0x83230008 # Diagnose X'08'\n"
- " sam64"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen)
- : "2", "3" );
+ asm volatile ( "lrag 2,0(%1)\n"
+ "lgr 3,%2\n"
+ "sam31\n"
+ "diag 2,3,0x8\n"
+ "sam64\n"
+ "lgr %0,3\n"
+ : "=d" (return_code)
+ : "a" (cpcmd_buf), "d" (cmdlen)
+ : "2", "3" );
#endif /* CONFIG_ARCH_S390X */
}
spin_unlock_irqrestore(&cpcmd_lock, flags);
+ if (response_code != NULL)
+ *response_code = return_code;
+ return return_len;
}
EXPORT_SYMBOL(__cpcmd);
#ifdef CONFIG_ARCH_S390X
-void cpcmd(char *cmd, char *response, int rlen)
+int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
{
char *lowbuf;
+ int len;
+
if ((rlen == 0) || (response == NULL)
|| !((unsigned long)response >> 31))
- __cpcmd(cmd, response, rlen);
+ len = __cpcmd(cmd, response, rlen, response_code);
else {
lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
if (!lowbuf) {
printk(KERN_WARNING
"cpcmd: could not allocate response buffer\n");
- return;
+ return -ENOMEM;
}
- __cpcmd(cmd, lowbuf, rlen);
+ len = __cpcmd(cmd, lowbuf, rlen, response_code);
memcpy(response, lowbuf, rlen);
kfree(lowbuf);
}
+ return len;
}
EXPORT_SYMBOL(cpcmd);
