[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>

1 files changed, 65 insertions, 44 deletions

diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c
index 44df8dc07c59..20062145e84e 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);