133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/*
|
|
* arch/s390/kernel/cpcmd.c
|
|
*
|
|
* S390 version
|
|
* 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/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 <asm/cpcmd.h>
|
|
#include <asm/system.h>
|
|
|
|
static DEFINE_SPINLOCK(cpcmd_lock);
|
|
static char cpcmd_buf[241];
|
|
|
|
/*
|
|
* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
|
|
*/
|
|
int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
|
|
{
|
|
const int mask = 0x40000000L;
|
|
unsigned long flags;
|
|
int return_code;
|
|
int return_len;
|
|
int cmdlen;
|
|
|
|
spin_lock_irqsave(&cpcmd_lock, flags);
|
|
cmdlen = strlen(cmd);
|
|
BUG_ON(cmdlen > 240);
|
|
memcpy(cpcmd_buf, cmd, cmdlen);
|
|
ASCEBC(cpcmd_buf, cmdlen);
|
|
|
|
if (response != NULL && rlen > 0) {
|
|
memset(response, 0, rlen);
|
|
#ifndef CONFIG_64BIT
|
|
asm volatile ( "lra 2,0(%2)\n"
|
|
"lr 4,%3\n"
|
|
"o 4,%6\n"
|
|
"lra 3,0(%4)\n"
|
|
"lr 5,%5\n"
|
|
"diag 2,4,0x8\n"
|
|
"brc 8, 1f\n"
|
|
"ar 5, %5\n"
|
|
"1: \n"
|
|
"lr %0,4\n"
|
|
"lr %1,5\n"
|
|
: "=d" (return_code), "=d" (return_len)
|
|
: "a" (cpcmd_buf), "d" (cmdlen),
|
|
"a" (response), "d" (rlen), "m" (mask)
|
|
: "cc", "2", "3", "4", "5" );
|
|
#else /* CONFIG_64BIT */
|
|
asm volatile ( "lrag 2,0(%2)\n"
|
|
"lgr 4,%3\n"
|
|
"o 4,%6\n"
|
|
"lrag 3,0(%4)\n"
|
|
"lgr 5,%5\n"
|
|
"sam31\n"
|
|
"diag 2,4,0x8\n"
|
|
"sam64\n"
|
|
"brc 8, 1f\n"
|
|
"agr 5, %5\n"
|
|
"1: \n"
|
|
"lgr %0,4\n"
|
|
"lgr %1,5\n"
|
|
: "=d" (return_code), "=d" (return_len)
|
|
: "a" (cpcmd_buf), "d" (cmdlen),
|
|
"a" (response), "d" (rlen), "m" (mask)
|
|
: "cc", "2", "3", "4", "5" );
|
|
#endif /* CONFIG_64BIT */
|
|
EBCASC(response, rlen);
|
|
} else {
|
|
return_len = 0;
|
|
#ifndef CONFIG_64BIT
|
|
asm volatile ( "lra 2,0(%1)\n"
|
|
"lr 3,%2\n"
|
|
"diag 2,3,0x8\n"
|
|
"lr %0,3\n"
|
|
: "=d" (return_code)
|
|
: "a" (cpcmd_buf), "d" (cmdlen)
|
|
: "2", "3" );
|
|
#else /* CONFIG_64BIT */
|
|
asm volatile ( "lrag 2,0(%1)\n"
|
|
"lgr 3,%2\n"
|
|
"sam31\n"
|
|
"diag 2,3,0x8\n"
|
|
"sam64\n"
|
|
"lgr %0,3\n"
|
|
: "=d" (return_code)
|
|
: "a" (cpcmd_buf), "d" (cmdlen)
|
|
: "2", "3" );
|
|
#endif /* CONFIG_64BIT */
|
|
}
|
|
spin_unlock_irqrestore(&cpcmd_lock, flags);
|
|
if (response_code != NULL)
|
|
*response_code = return_code;
|
|
return return_len;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__cpcmd);
|
|
|
|
#ifdef CONFIG_64BIT
|
|
int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
|
|
{
|
|
char *lowbuf;
|
|
int len;
|
|
|
|
if ((rlen == 0) || (response == NULL)
|
|
|| !((unsigned long)response >> 31))
|
|
len = __cpcmd(cmd, response, rlen, response_code);
|
|
else {
|
|
lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
|
|
if (!lowbuf) {
|
|
printk(KERN_WARNING
|
|
"cpcmd: could not allocate response buffer\n");
|
|
return -ENOMEM;
|
|
}
|
|
len = __cpcmd(cmd, lowbuf, rlen, response_code);
|
|
memcpy(response, lowbuf, rlen);
|
|
kfree(lowbuf);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
EXPORT_SYMBOL(cpcmd);
|
|
#endif /* CONFIG_64BIT */
|