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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a004fb0c33
After assigning values to specific registers memset was called. This may clobber the contents of the used registers. To solve this extract the two used inline assemblies into small functions that don't call any functions. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
124 lines
2.9 KiB
C
124 lines
2.9 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 IBM Corp. 1999,2007
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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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#include <asm/io.h>
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static DEFINE_SPINLOCK(cpcmd_lock);
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static char cpcmd_buf[241];
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static int diag8_noresponse(int cmdlen)
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{
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register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
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register unsigned long reg3 asm ("3") = cmdlen;
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asm volatile(
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#ifndef CONFIG_64BIT
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" diag %1,%0,0x8\n"
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#else /* CONFIG_64BIT */
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" sam31\n"
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" diag %1,%0,0x8\n"
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" sam64\n"
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#endif /* CONFIG_64BIT */
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: "+d" (reg3) : "d" (reg2) : "cc");
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return reg3;
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}
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static int diag8_response(int cmdlen, char *response, int *rlen)
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{
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register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
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register unsigned long reg3 asm ("3") = (addr_t) response;
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register unsigned long reg4 asm ("4") = cmdlen | 0x40000000L;
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register unsigned long reg5 asm ("5") = *rlen;
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asm volatile(
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#ifndef CONFIG_64BIT
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" diag %2,%0,0x8\n"
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" brc 8,1f\n"
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" ar %1,%4\n"
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#else /* CONFIG_64BIT */
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" sam31\n"
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" diag %2,%0,0x8\n"
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" sam64\n"
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" brc 8,1f\n"
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" agr %1,%4\n"
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#endif /* CONFIG_64BIT */
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"1:\n"
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: "+d" (reg4), "+d" (reg5)
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: "d" (reg2), "d" (reg3), "d" (*rlen) : "cc");
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*rlen = reg5;
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return reg4;
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}
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/*
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* __cpcmd has some restrictions over cpcmd
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* - the response buffer must reside below 2GB (if any)
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* - __cpcmd is unlocked and therefore not SMP-safe
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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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int cmdlen;
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int rc;
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int response_len;
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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) {
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memset(response, 0, rlen);
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response_len = rlen;
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rc = diag8_response(cmdlen, response, &rlen);
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EBCASC(response, response_len);
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} else {
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rc = diag8_noresponse(cmdlen);
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}
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if (response_code)
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*response_code = rc;
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return rlen;
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}
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EXPORT_SYMBOL(__cpcmd);
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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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unsigned long flags;
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if ((virt_to_phys(response) != (unsigned long) response) ||
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(((unsigned long)response + rlen) >> 31)) {
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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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spin_lock_irqsave(&cpcmd_lock, flags);
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len = __cpcmd(cmd, lowbuf, rlen, response_code);
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spin_unlock_irqrestore(&cpcmd_lock, flags);
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memcpy(response, lowbuf, rlen);
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kfree(lowbuf);
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} else {
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spin_lock_irqsave(&cpcmd_lock, flags);
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len = __cpcmd(cmd, response, rlen, response_code);
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spin_unlock_irqrestore(&cpcmd_lock, flags);
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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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