Linux/Unix编程

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Unix_Linux

cpcmd.c：源码内容

							/*
 *  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/stddef.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/ebcdic.h>
#include <asm/cpcmd.h>
void cpcmd(char *cmd, char *response, int rlen)
{
        const int mask = 0x40000000L;
        char obuffer[128];
        int olen;
        olen = strlen(cmd);
        strcpy(obuffer, cmd);
        ASCEBC(obuffer,olen);
        if (response != NULL && rlen > 0) {
                asm volatile ("LRA   2,0(%0)nt"
                              "LR    4,%1nt"
                              "O     4,%4nt"
                              "LRA   3,0(%2)nt"
                              "LR    5,%3nt"
                              ".long 0x83240008 # Diagnose 83nt"
                              : /* no output */
                              : "a" (obuffer), "d" (olen),
                                "a" (response), "d" (rlen), "m" (mask)
                              : "2", "3", "4", "5" );
                EBCASC(response, rlen);
        } else {
                asm volatile ("LRA   2,0(%0)nt"
                              "LR    3,%1nt"
                              ".long 0x83230008 # Diagnose 83nt"
                              : /* no output */
                              : "a" (obuffer), "d" (olen)
                              : "2", "3"  );
        }
}

						