6b979de395
Add interface to issue VM control program commands. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
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* arch/s390/kernel/cpcmd.c
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*
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* S390 version
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* Copyright (C) 1999,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Christian Borntraeger (cborntra@de.ibm.com),
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <asm/ebcdic.h>
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#include <asm/cpcmd.h>
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#include <asm/system.h>
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static DEFINE_SPINLOCK(cpcmd_lock);
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static char cpcmd_buf[241];
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/*
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* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
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*/
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int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
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{
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const int mask = 0x40000000L;
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unsigned long flags;
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int return_code;
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int return_len;
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int cmdlen;
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spin_lock_irqsave(&cpcmd_lock, flags);
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cmdlen = strlen(cmd);
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BUG_ON(cmdlen > 240);
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memcpy(cpcmd_buf, cmd, cmdlen);
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ASCEBC(cpcmd_buf, cmdlen);
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if (response != NULL && rlen > 0) {
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memset(response, 0, rlen);
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#ifndef CONFIG_ARCH_S390X
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asm volatile ( "lra 2,0(%2)\n"
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"lr 4,%3\n"
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"o 4,%6\n"
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"lra 3,0(%4)\n"
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"lr 5,%5\n"
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"diag 2,4,0x8\n"
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"brc 8, .Litfits\n"
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"ar 5, %5\n"
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".Litfits: \n"
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"lr %0,4\n"
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"lr %1,5\n"
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: "=d" (return_code), "=d" (return_len)
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: "a" (cpcmd_buf), "d" (cmdlen),
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"a" (response), "d" (rlen), "m" (mask)
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: "cc", "2", "3", "4", "5" );
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#else /* CONFIG_ARCH_S390X */
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asm volatile ( "lrag 2,0(%2)\n"
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"lgr 4,%3\n"
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"o 4,%6\n"
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"lrag 3,0(%4)\n"
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"lgr 5,%5\n"
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"sam31\n"
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"diag 2,4,0x8\n"
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"sam64\n"
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"brc 8, .Litfits\n"
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"agr 5, %5\n"
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".Litfits: \n"
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"lgr %0,4\n"
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"lgr %1,5\n"
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: "=d" (return_code), "=d" (return_len)
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: "a" (cpcmd_buf), "d" (cmdlen),
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"a" (response), "d" (rlen), "m" (mask)
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: "cc", "2", "3", "4", "5" );
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#endif /* CONFIG_ARCH_S390X */
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EBCASC(response, rlen);
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} else {
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return_len = 0;
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#ifndef CONFIG_ARCH_S390X
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asm volatile ( "lra 2,0(%1)\n"
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"lr 3,%2\n"
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"diag 2,3,0x8\n"
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"lr %0,3\n"
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: "=d" (return_code)
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: "a" (cpcmd_buf), "d" (cmdlen)
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: "2", "3" );
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#else /* CONFIG_ARCH_S390X */
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asm volatile ( "lrag 2,0(%1)\n"
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"lgr 3,%2\n"
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"sam31\n"
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"diag 2,3,0x8\n"
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"sam64\n"
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"lgr %0,3\n"
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: "=d" (return_code)
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: "a" (cpcmd_buf), "d" (cmdlen)
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: "2", "3" );
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#endif /* CONFIG_ARCH_S390X */
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}
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spin_unlock_irqrestore(&cpcmd_lock, flags);
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if (response_code != NULL)
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*response_code = return_code;
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return return_len;
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}
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EXPORT_SYMBOL(__cpcmd);
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#ifdef CONFIG_ARCH_S390X
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int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
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{
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char *lowbuf;
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int len;
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if ((rlen == 0) || (response == NULL)
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|| !((unsigned long)response >> 31))
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len = __cpcmd(cmd, response, rlen, response_code);
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else {
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lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
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if (!lowbuf) {
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printk(KERN_WARNING
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"cpcmd: could not allocate response buffer\n");
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return -ENOMEM;
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}
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len = __cpcmd(cmd, lowbuf, rlen, response_code);
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memcpy(response, lowbuf, rlen);
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kfree(lowbuf);
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}
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return len;
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}
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EXPORT_SYMBOL(cpcmd);
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#endif /* CONFIG_ARCH_S390X */
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