cpcmd.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:2k
- /*
- * 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,%1n"
- " o 4,%4n"
- " lrag 3,0(%2)n"
- " lgr 5,%3n"
- " sam31n"
- " .long 0x83240008 # Diagnose 83n"
- " 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,%1n"
- " sam31n"
- " .long 0x83230008 # Diagnose 83n"
- " sam64"
- : /* no output */
- : "a" (cpcmd_buf), "d" (cmdlen)
- : "2", "3" );
- }
- spin_unlock_irqrestore(&cpcmd_lock, flags);
- }