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-rw-r--r--arch/s390/kernel/cpcmd.c109
1 files changed, 65 insertions, 44 deletions
diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c
index 44df8dc07c59..20062145e84e 100644
--- a/arch/s390/kernel/cpcmd.c
+++ b/arch/s390/kernel/cpcmd.c
@@ -2,7 +2,7 @@
2 * arch/s390/kernel/cpcmd.c 2 * arch/s390/kernel/cpcmd.c
3 * 3 *
4 * S390 version 4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 5 * Copyright (C) 1999,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7 * Christian Borntraeger (cborntra@de.ibm.com), 7 * Christian Borntraeger (cborntra@de.ibm.com),
8 */ 8 */
@@ -18,93 +18,114 @@
18#include <asm/system.h> 18#include <asm/system.h>
19 19
20static DEFINE_SPINLOCK(cpcmd_lock); 20static DEFINE_SPINLOCK(cpcmd_lock);
21static char cpcmd_buf[240]; 21static char cpcmd_buf[241];
22 22
23/* 23/*
24 * the caller of __cpcmd has to ensure that the response buffer is below 2 GB 24 * the caller of __cpcmd has to ensure that the response buffer is below 2 GB
25 */ 25 */
26void __cpcmd(char *cmd, char *response, int rlen) 26int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
27{ 27{
28 const int mask = 0x40000000L; 28 const int mask = 0x40000000L;
29 unsigned long flags; 29 unsigned long flags;
30 int return_code;
31 int return_len;
30 int cmdlen; 32 int cmdlen;
31 33
32 spin_lock_irqsave(&cpcmd_lock, flags); 34 spin_lock_irqsave(&cpcmd_lock, flags);
33 cmdlen = strlen(cmd); 35 cmdlen = strlen(cmd);
34 BUG_ON(cmdlen > 240); 36 BUG_ON(cmdlen > 240);
35 strcpy(cpcmd_buf, cmd); 37 memcpy(cpcmd_buf, cmd, cmdlen);
36 ASCEBC(cpcmd_buf, cmdlen); 38 ASCEBC(cpcmd_buf, cmdlen);
37 39
38 if (response != NULL && rlen > 0) { 40 if (response != NULL && rlen > 0) {
39 memset(response, 0, rlen); 41 memset(response, 0, rlen);
40#ifndef CONFIG_ARCH_S390X 42#ifndef CONFIG_ARCH_S390X
41 asm volatile ("LRA 2,0(%0)\n\t" 43 asm volatile ( "lra 2,0(%2)\n"
42 "LR 4,%1\n\t" 44 "lr 4,%3\n"
43 "O 4,%4\n\t" 45 "o 4,%6\n"
44 "LRA 3,0(%2)\n\t" 46 "lra 3,0(%4)\n"
45 "LR 5,%3\n\t" 47 "lr 5,%5\n"
46 ".long 0x83240008 # Diagnose X'08'\n\t" 48 "diag 2,4,0x8\n"
47 : /* no output */ 49 "brc 8, .Litfits\n"
48 : "a" (cpcmd_buf), "d" (cmdlen), 50 "ar 5, %5\n"
49 "a" (response), "d" (rlen), "m" (mask) 51 ".Litfits: \n"
50 : "cc", "2", "3", "4", "5" ); 52 "lr %0,4\n"
53 "lr %1,5\n"
54 : "=d" (return_code), "=d" (return_len)
55 : "a" (cpcmd_buf), "d" (cmdlen),
56 "a" (response), "d" (rlen), "m" (mask)
57 : "cc", "2", "3", "4", "5" );
51#else /* CONFIG_ARCH_S390X */ 58#else /* CONFIG_ARCH_S390X */
52 asm volatile (" lrag 2,0(%0)\n" 59 asm volatile ( "lrag 2,0(%2)\n"
53 " lgr 4,%1\n" 60 "lgr 4,%3\n"
54 " o 4,%4\n" 61 "o 4,%6\n"
55 " lrag 3,0(%2)\n" 62 "lrag 3,0(%4)\n"
56 " lgr 5,%3\n" 63 "lgr 5,%5\n"
57 " sam31\n" 64 "sam31\n"
58 " .long 0x83240008 # Diagnose X'08'\n" 65 "diag 2,4,0x8\n"
59 " sam64" 66 "sam64\n"
60 : /* no output */ 67 "brc 8, .Litfits\n"
61 : "a" (cpcmd_buf), "d" (cmdlen), 68 "agr 5, %5\n"
62 "a" (response), "d" (rlen), "m" (mask) 69 ".Litfits: \n"
63 : "cc", "2", "3", "4", "5" ); 70 "lgr %0,4\n"
71 "lgr %1,5\n"
72 : "=d" (return_code), "=d" (return_len)
73 : "a" (cpcmd_buf), "d" (cmdlen),
74 "a" (response), "d" (rlen), "m" (mask)
75 : "cc", "2", "3", "4", "5" );
64#endif /* CONFIG_ARCH_S390X */ 76#endif /* CONFIG_ARCH_S390X */
65 EBCASC(response, rlen); 77 EBCASC(response, rlen);
66 } else { 78 } else {
79 return_len = 0;
67#ifndef CONFIG_ARCH_S390X 80#ifndef CONFIG_ARCH_S390X
68 asm volatile ("LRA 2,0(%0)\n\t" 81 asm volatile ( "lra 2,0(%1)\n"
69 "LR 3,%1\n\t" 82 "lr 3,%2\n"
70 ".long 0x83230008 # Diagnose X'08'\n\t" 83 "diag 2,3,0x8\n"
71 : /* no output */ 84 "lr %0,3\n"
72 : "a" (cpcmd_buf), "d" (cmdlen) 85 : "=d" (return_code)
73 : "2", "3" ); 86 : "a" (cpcmd_buf), "d" (cmdlen)
87 : "2", "3" );
74#else /* CONFIG_ARCH_S390X */ 88#else /* CONFIG_ARCH_S390X */
75 asm volatile (" lrag 2,0(%0)\n" 89 asm volatile ( "lrag 2,0(%1)\n"
76 " lgr 3,%1\n" 90 "lgr 3,%2\n"
77 " sam31\n" 91 "sam31\n"
78 " .long 0x83230008 # Diagnose X'08'\n" 92 "diag 2,3,0x8\n"
79 " sam64" 93 "sam64\n"
80 : /* no output */ 94 "lgr %0,3\n"
81 : "a" (cpcmd_buf), "d" (cmdlen) 95 : "=d" (return_code)
82 : "2", "3" ); 96 : "a" (cpcmd_buf), "d" (cmdlen)
97 : "2", "3" );
83#endif /* CONFIG_ARCH_S390X */ 98#endif /* CONFIG_ARCH_S390X */
84 } 99 }
85 spin_unlock_irqrestore(&cpcmd_lock, flags); 100 spin_unlock_irqrestore(&cpcmd_lock, flags);
101 if (response_code != NULL)
102 *response_code = return_code;
103 return return_len;
86} 104}
87 105
88EXPORT_SYMBOL(__cpcmd); 106EXPORT_SYMBOL(__cpcmd);
89 107
90#ifdef CONFIG_ARCH_S390X 108#ifdef CONFIG_ARCH_S390X
91void cpcmd(char *cmd, char *response, int rlen) 109int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
92{ 110{
93 char *lowbuf; 111 char *lowbuf;
112 int len;
113
94 if ((rlen == 0) || (response == NULL) 114 if ((rlen == 0) || (response == NULL)
95 || !((unsigned long)response >> 31)) 115 || !((unsigned long)response >> 31))
96 __cpcmd(cmd, response, rlen); 116 len = __cpcmd(cmd, response, rlen, response_code);
97 else { 117 else {
98 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA); 118 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
99 if (!lowbuf) { 119 if (!lowbuf) {
100 printk(KERN_WARNING 120 printk(KERN_WARNING
101 "cpcmd: could not allocate response buffer\n"); 121 "cpcmd: could not allocate response buffer\n");
102 return; 122 return -ENOMEM;
103 } 123 }
104 __cpcmd(cmd, lowbuf, rlen); 124 len = __cpcmd(cmd, lowbuf, rlen, response_code);
105 memcpy(response, lowbuf, rlen); 125 memcpy(response, lowbuf, rlen);
106 kfree(lowbuf); 126 kfree(lowbuf);
107 } 127 }
128 return len;
108} 129}
109 130
110EXPORT_SYMBOL(cpcmd); 131EXPORT_SYMBOL(cpcmd);
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