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114 lines
2.5 KiB
114 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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 ([email protected]), |
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* Christian Borntraeger ([email protected]), |
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*/ |
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#define KMSG_COMPONENT "cpcmd" |
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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#include <linux/kernel.h> |
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#include <linux/export.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 <linux/mm.h> |
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#include <asm/diag.h> |
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#include <asm/ebcdic.h> |
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#include <asm/cpcmd.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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asm volatile( |
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" diag %[rx],%[ry],0x8\n" |
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: [ry] "+&d" (cmdlen) |
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: [rx] "d" ((addr_t) cpcmd_buf) |
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: "cc"); |
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return cmdlen; |
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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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union register_pair rx, ry; |
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int cc; |
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rx.even = (addr_t) cpcmd_buf; |
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rx.odd = (addr_t) response; |
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ry.even = cmdlen | 0x40000000L; |
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ry.odd = *rlen; |
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asm volatile( |
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" diag %[rx],%[ry],0x8\n" |
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" ipm %[cc]\n" |
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" srl %[cc],28\n" |
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: [cc] "=&d" (cc), [ry] "+&d" (ry.pair) |
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: [rx] "d" (rx.pair) |
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: "cc"); |
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if (cc) |
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*rlen += ry.odd; |
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else |
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*rlen = ry.odd; |
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return ry.even; |
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} |
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/* |
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* __cpcmd has some restrictions over cpcmd |
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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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diag_stat_inc(DIAG_STAT_X008); |
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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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unsigned long flags; |
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char *lowbuf; |
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int len; |
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if (is_vmalloc_or_module_addr(response)) { |
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lowbuf = kmalloc(rlen, GFP_KERNEL); |
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if (!lowbuf) { |
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pr_warn("The cpcmd kernel function failed to allocate a 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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