* S390 version
* Copyright (C) 1999,2000 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[240];
-void cpcmd(char *cmd, char *response, int rlen)
+/*
+ * the caller of __cpcmd has to ensure that the response buffer is below 2 GB
+ */
+void __cpcmd(char *cmd, char *response, int rlen)
{
- const int mask = 0x40000000L;
+ const int mask = 0x40000000L;
unsigned long flags;
- int cmdlen;
+ int cmdlen;
spin_lock_irqsave(&cpcmd_lock, flags);
- cmdlen = strlen(cmd);
- strcpy(cpcmd_buf, cmd);
- ASCEBC(cpcmd_buf, cmdlen);
+ cmdlen = strlen(cmd);
+ BUG_ON(cmdlen > 240);
+ strcpy(cpcmd_buf, cmd);
+ ASCEBC(cpcmd_buf, cmdlen);
- if (response != NULL && rlen > 0) {
+ if (response != NULL && rlen > 0) {
+ memset(response, 0, rlen);
#ifndef CONFIG_ARCH_S390X
- asm volatile ("LRA 2,0(%0)\n\t"
+ 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"
+ ".long 0x83240008 # Diagnose X'08'\n\t"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
- : "2", "3", "4", "5" );
+ : "cc", "2", "3", "4", "5" );
#else /* CONFIG_ARCH_S390X */
asm volatile (" lrag 2,0(%0)\n"
" lgr 4,%1\n"
" lrag 3,0(%2)\n"
" lgr 5,%3\n"
" sam31\n"
- " .long 0x83240008 # Diagnose 83\n"
+ " .long 0x83240008 # Diagnose X'08'\n"
" sam64"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
- : "2", "3", "4", "5" );
+ : "cc", "2", "3", "4", "5" );
#endif /* CONFIG_ARCH_S390X */
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"
+ ".long 0x83230008 # Diagnose X'08'\n\t"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen)
: "2", "3" );
asm volatile (" lrag 2,0(%0)\n"
" lgr 3,%1\n"
" sam31\n"
- " .long 0x83230008 # Diagnose 83\n"
+ " .long 0x83230008 # Diagnose X'08'\n"
" sam64"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen)
spin_unlock_irqrestore(&cpcmd_lock, flags);
}
+EXPORT_SYMBOL(__cpcmd);
+
+#ifdef CONFIG_ARCH_S390X
+void cpcmd(char *cmd, char *response, int rlen)
+{
+ char *lowbuf;
+ if ((rlen == 0) || (response == NULL)
+ || !((unsigned long)response >> 31))
+ __cpcmd(cmd, response, rlen);
+ else {
+ lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
+ if (!lowbuf) {
+ printk(KERN_WARNING
+ "cpcmd: could not allocate response buffer\n");
+ return;
+ }
+ __cpcmd(cmd, lowbuf, rlen);
+ memcpy(response, lowbuf, rlen);
+ kfree(lowbuf);
+ }
+}
+
+EXPORT_SYMBOL(cpcmd);
+#endif /* CONFIG_ARCH_S390X */