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/*
* arch/s390/kernel/cpcmd.c
*
* S390 version
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
*/
#include <linux/string.h>
#include <linux/spinlock.h>
#include <asm/cpcmd.h>
#include <asm/ebcdic.h>
#include <asm/system.h>
static spinlock_t cpcmd_lock = SPIN_LOCK_UNLOCKED;
static char cpcmd_buf[128];
void cpcmd(char *cmd, char *response, int rlen)
{
const int mask = 0x40000000L;
unsigned long flags;
int cmdlen;
spin_lock_irqsave(&cpcmd_lock, flags);
cmdlen = strlen(cmd);
strcpy(cpcmd_buf, cmd);
ASCEBC(cpcmd_buf, cmdlen);
if (response != NULL && rlen > 0) {
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" );
EBCASC(response, rlen);
} else {
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" );
}
spin_unlock_irqrestore(&cpcmd_lock, flags);
}
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