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1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2007
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
5 * Christian Borntraeger (cborntra@de.ibm.com),
6 */
7
8#define KMSG_COMPONENT "cpcmd"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/stddef.h>
16#include <linux/string.h>
17#include <asm/diag.h>
18#include <asm/ebcdic.h>
19#include <asm/cpcmd.h>
20#include <asm/io.h>
21
22static DEFINE_SPINLOCK(cpcmd_lock);
23static char cpcmd_buf[241];
24
25static int diag8_noresponse(int cmdlen)
26{
27 register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
28 register unsigned long reg3 asm ("3") = cmdlen;
29
30 asm volatile(
31 " sam31\n"
32 " diag %1,%0,0x8\n"
33 " sam64\n"
34 : "+d" (reg3) : "d" (reg2) : "cc");
35 return reg3;
36}
37
38static int diag8_response(int cmdlen, char *response, int *rlen)
39{
40 register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
41 register unsigned long reg3 asm ("3") = (addr_t) response;
42 register unsigned long reg4 asm ("4") = cmdlen | 0x40000000L;
43 register unsigned long reg5 asm ("5") = *rlen;
44
45 asm volatile(
46 " sam31\n"
47 " diag %2,%0,0x8\n"
48 " sam64\n"
49 " brc 8,1f\n"
50 " agr %1,%4\n"
51 "1:\n"
52 : "+d" (reg4), "+d" (reg5)
53 : "d" (reg2), "d" (reg3), "d" (*rlen) : "cc");
54 *rlen = reg5;
55 return reg4;
56}
57
58/*
59 * __cpcmd has some restrictions over cpcmd
60 * - the response buffer must reside below 2GB (if any)
61 * - __cpcmd is unlocked and therefore not SMP-safe
62 */
63int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
64{
65 int cmdlen;
66 int rc;
67 int response_len;
68
69 cmdlen = strlen(cmd);
70 BUG_ON(cmdlen > 240);
71 memcpy(cpcmd_buf, cmd, cmdlen);
72 ASCEBC(cpcmd_buf, cmdlen);
73
74 diag_stat_inc(DIAG_STAT_X008);
75 if (response) {
76 memset(response, 0, rlen);
77 response_len = rlen;
78 rc = diag8_response(cmdlen, response, &rlen);
79 EBCASC(response, response_len);
80 } else {
81 rc = diag8_noresponse(cmdlen);
82 }
83 if (response_code)
84 *response_code = rc;
85 return rlen;
86}
87EXPORT_SYMBOL(__cpcmd);
88
89int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
90{
91 char *lowbuf;
92 int len;
93 unsigned long flags;
94
95 if ((virt_to_phys(response) != (unsigned long) response) ||
96 (((unsigned long)response + rlen) >> 31)) {
97 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
98 if (!lowbuf) {
99 pr_warn("The cpcmd kernel function failed to allocate a response buffer\n");
100 return -ENOMEM;
101 }
102 spin_lock_irqsave(&cpcmd_lock, flags);
103 len = __cpcmd(cmd, lowbuf, rlen, response_code);
104 spin_unlock_irqrestore(&cpcmd_lock, flags);
105 memcpy(response, lowbuf, rlen);
106 kfree(lowbuf);
107 } else {
108 spin_lock_irqsave(&cpcmd_lock, flags);
109 len = __cpcmd(cmd, response, rlen, response_code);
110 spin_unlock_irqrestore(&cpcmd_lock, flags);
111 }
112 return len;
113}
114EXPORT_SYMBOL(cpcmd);
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2007
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
5 * Christian Borntraeger (cborntra@de.ibm.com),
6 */
7
8#define KMSG_COMPONENT "cpcmd"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/stddef.h>
16#include <linux/string.h>
17#include <asm/ebcdic.h>
18#include <asm/cpcmd.h>
19#include <asm/io.h>
20
21static DEFINE_SPINLOCK(cpcmd_lock);
22static char cpcmd_buf[241];
23
24static int diag8_noresponse(int cmdlen)
25{
26 register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
27 register unsigned long reg3 asm ("3") = cmdlen;
28
29 asm volatile(
30#ifndef CONFIG_64BIT
31 " diag %1,%0,0x8\n"
32#else /* CONFIG_64BIT */
33 " sam31\n"
34 " diag %1,%0,0x8\n"
35 " sam64\n"
36#endif /* CONFIG_64BIT */
37 : "+d" (reg3) : "d" (reg2) : "cc");
38 return reg3;
39}
40
41static int diag8_response(int cmdlen, char *response, int *rlen)
42{
43 register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
44 register unsigned long reg3 asm ("3") = (addr_t) response;
45 register unsigned long reg4 asm ("4") = cmdlen | 0x40000000L;
46 register unsigned long reg5 asm ("5") = *rlen;
47
48 asm volatile(
49#ifndef CONFIG_64BIT
50 " diag %2,%0,0x8\n"
51 " brc 8,1f\n"
52 " ar %1,%4\n"
53#else /* CONFIG_64BIT */
54 " sam31\n"
55 " diag %2,%0,0x8\n"
56 " sam64\n"
57 " brc 8,1f\n"
58 " agr %1,%4\n"
59#endif /* CONFIG_64BIT */
60 "1:\n"
61 : "+d" (reg4), "+d" (reg5)
62 : "d" (reg2), "d" (reg3), "d" (*rlen) : "cc");
63 *rlen = reg5;
64 return reg4;
65}
66
67/*
68 * __cpcmd has some restrictions over cpcmd
69 * - the response buffer must reside below 2GB (if any)
70 * - __cpcmd is unlocked and therefore not SMP-safe
71 */
72int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
73{
74 int cmdlen;
75 int rc;
76 int response_len;
77
78 cmdlen = strlen(cmd);
79 BUG_ON(cmdlen > 240);
80 memcpy(cpcmd_buf, cmd, cmdlen);
81 ASCEBC(cpcmd_buf, cmdlen);
82
83 if (response) {
84 memset(response, 0, rlen);
85 response_len = rlen;
86 rc = diag8_response(cmdlen, response, &rlen);
87 EBCASC(response, response_len);
88 } else {
89 rc = diag8_noresponse(cmdlen);
90 }
91 if (response_code)
92 *response_code = rc;
93 return rlen;
94}
95EXPORT_SYMBOL(__cpcmd);
96
97int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
98{
99 char *lowbuf;
100 int len;
101 unsigned long flags;
102
103 if ((virt_to_phys(response) != (unsigned long) response) ||
104 (((unsigned long)response + rlen) >> 31)) {
105 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
106 if (!lowbuf) {
107 pr_warning("The cpcmd kernel function failed to "
108 "allocate a response buffer\n");
109 return -ENOMEM;
110 }
111 spin_lock_irqsave(&cpcmd_lock, flags);
112 len = __cpcmd(cmd, lowbuf, rlen, response_code);
113 spin_unlock_irqrestore(&cpcmd_lock, flags);
114 memcpy(response, lowbuf, rlen);
115 kfree(lowbuf);
116 } else {
117 spin_lock_irqsave(&cpcmd_lock, flags);
118 len = __cpcmd(cmd, response, rlen, response_code);
119 spin_unlock_irqrestore(&cpcmd_lock, flags);
120 }
121 return len;
122}
123EXPORT_SYMBOL(cpcmd);