* 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),
*/
-#include <linux/stddef.h>
#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 <linux/spinlock.h>
#include <asm/cpcmd.h>
#include <asm/system.h>
-static spinlock_t cpcmd_lock = SPIN_LOCK_UNLOCKED;
-static char cpcmd_buf[128];
+static DEFINE_SPINLOCK(cpcmd_lock);
+static char cpcmd_buf[241];
-void cpcmd(char *cmd, char *response, int rlen)
+/*
+ * __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)
{
- const int mask = 0x40000000L;
- unsigned long flags;
- int cmdlen;
+ unsigned cmdlen;
+ int return_code, return_len;
- spin_lock_irqsave(&cpcmd_lock, flags);
- cmdlen = strlen(cmd);
- strcpy(cpcmd_buf, cmd);
- ASCEBC(cpcmd_buf, cmdlen);
+ cmdlen = strlen(cmd);
+ BUG_ON(cmdlen > 240);
+ memcpy(cpcmd_buf, cmd, cmdlen);
+ ASCEBC(cpcmd_buf, cmdlen);
- if (response != NULL && rlen > 0) {
-#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 83\n\t"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen),
- "a" (response), "d" (rlen), "m" (mask)
- : "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 83\n"
- " sam64"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen),
- "a" (response), "d" (rlen), "m" (mask)
- : "2", "3", "4", "5" );
-#endif /* CONFIG_ARCH_S390X */
+ 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;
+
+ 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);
} else {
-#ifndef CONFIG_ARCH_S390X
- asm volatile ("LRA 2,0(%0)\n\t"
- "LR 3,%1\n\t"
- ".long 0x83230008 # Diagnose 83\n\t"
- : /* no output */
- : "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 83\n"
- " sam64"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen)
- : "2", "3" );
-#endif /* CONFIG_ARCH_S390X */
+ 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;
}
- spin_unlock_irqrestore(&cpcmd_lock, flags);
+ if (response_code != NULL)
+ *response_code = return_code;
+ return return_len;
+}
+
+EXPORT_SYMBOL(__cpcmd);
+
+int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
+{
+ char *lowbuf;
+ int len;
+ unsigned long flags;
+
+ if ((rlen == 0) || (response == NULL)
+ || !((unsigned long)response >> 31)) {
+ spin_lock_irqsave(&cpcmd_lock, flags);
+ len = __cpcmd(cmd, response, rlen, response_code);
+ spin_unlock_irqrestore(&cpcmd_lock, flags);
+ }
+ else {
+ lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
+ if (!lowbuf) {
+ printk(KERN_WARNING
+ "cpcmd: could not allocate 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);
+ }
+ return len;
}
+EXPORT_SYMBOL(cpcmd);
git://git.onelab.eu / linux-2.6.git / blobdiff