Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/cpcmd.c | |
3 | * | |
4 | * S390 version | |
6b979de3 | 5 | * Copyright (C) 1999,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation |
1da177e4 LT |
6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
7 | * Christian Borntraeger (cborntra@de.ibm.com), | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/stddef.h> | |
15 | #include <linux/string.h> | |
16 | #include <asm/ebcdic.h> | |
17 | #include <asm/cpcmd.h> | |
18 | #include <asm/system.h> | |
bda3563f | 19 | #include <asm/io.h> |
1da177e4 LT |
20 | |
21 | static DEFINE_SPINLOCK(cpcmd_lock); | |
6b979de3 | 22 | static char cpcmd_buf[241]; |
1da177e4 LT |
23 | |
24 | /* | |
740b5706 HC |
25 | * __cpcmd has some restrictions over cpcmd |
26 | * - the response buffer must reside below 2GB (if any) | |
27 | * - __cpcmd is unlocked and therefore not SMP-safe | |
1da177e4 | 28 | */ |
6b979de3 | 29 | int __cpcmd(const char *cmd, char *response, int rlen, int *response_code) |
1da177e4 | 30 | { |
740b5706 | 31 | unsigned cmdlen; |
94c12cc7 | 32 | int return_code, return_len; |
1da177e4 | 33 | |
1da177e4 LT |
34 | cmdlen = strlen(cmd); |
35 | BUG_ON(cmdlen > 240); | |
6b979de3 | 36 | memcpy(cpcmd_buf, cmd, cmdlen); |
1da177e4 LT |
37 | ASCEBC(cpcmd_buf, cmdlen); |
38 | ||
39 | if (response != NULL && rlen > 0) { | |
94c12cc7 MS |
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 | ||
1da177e4 | 45 | memset(response, 0, rlen); |
94c12cc7 | 46 | asm volatile( |
347a8dc3 | 47 | #ifndef CONFIG_64BIT |
94c12cc7 MS |
48 | " diag %2,%0,0x8\n" |
49 | " brc 8,1f\n" | |
50 | " ar %1,%4\n" | |
347a8dc3 | 51 | #else /* CONFIG_64BIT */ |
94c12cc7 MS |
52 | " sam31\n" |
53 | " diag %2,%0,0x8\n" | |
54 | " sam64\n" | |
55 | " brc 8,1f\n" | |
56 | " agr %1,%4\n" | |
347a8dc3 | 57 | #endif /* CONFIG_64BIT */ |
94c12cc7 MS |
58 | "1:\n" |
59 | : "+d" (reg4), "+d" (reg5) | |
60 | : "d" (reg2), "d" (reg3), "d" (rlen) : "cc"); | |
61 | return_code = (int) reg4; | |
62 | return_len = (int) reg5; | |
1da177e4 LT |
63 | EBCASC(response, rlen); |
64 | } else { | |
94c12cc7 MS |
65 | register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf; |
66 | register unsigned long reg3 asm ("3") = cmdlen; | |
6b979de3 | 67 | return_len = 0; |
94c12cc7 | 68 | asm volatile( |
347a8dc3 | 69 | #ifndef CONFIG_64BIT |
94c12cc7 | 70 | " diag %1,%0,0x8\n" |
347a8dc3 | 71 | #else /* CONFIG_64BIT */ |
94c12cc7 MS |
72 | " sam31\n" |
73 | " diag %1,%0,0x8\n" | |
74 | " sam64\n" | |
347a8dc3 | 75 | #endif /* CONFIG_64BIT */ |
94c12cc7 MS |
76 | : "+d" (reg3) : "d" (reg2) : "cc"); |
77 | return_code = (int) reg3; | |
1da177e4 | 78 | } |
6b979de3 CB |
79 | if (response_code != NULL) |
80 | *response_code = return_code; | |
81 | return return_len; | |
1da177e4 LT |
82 | } |
83 | ||
84 | EXPORT_SYMBOL(__cpcmd); | |
85 | ||
6b979de3 | 86 | int cpcmd(const char *cmd, char *response, int rlen, int *response_code) |
1da177e4 LT |
87 | { |
88 | char *lowbuf; | |
6b979de3 | 89 | int len; |
740b5706 | 90 | unsigned long flags; |
6b979de3 | 91 | |
bda3563f CB |
92 | if ((virt_to_phys(response) != (unsigned long) response) || |
93 | (((unsigned long)response + rlen) >> 31)) { | |
1da177e4 LT |
94 | lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA); |
95 | if (!lowbuf) { | |
96 | printk(KERN_WARNING | |
97 | "cpcmd: could not allocate response buffer\n"); | |
6b979de3 | 98 | return -ENOMEM; |
1da177e4 | 99 | } |
740b5706 | 100 | spin_lock_irqsave(&cpcmd_lock, flags); |
6b979de3 | 101 | len = __cpcmd(cmd, lowbuf, rlen, response_code); |
740b5706 | 102 | spin_unlock_irqrestore(&cpcmd_lock, flags); |
1da177e4 LT |
103 | memcpy(response, lowbuf, rlen); |
104 | kfree(lowbuf); | |
bda3563f CB |
105 | } else { |
106 | spin_lock_irqsave(&cpcmd_lock, flags); | |
107 | len = __cpcmd(cmd, response, rlen, response_code); | |
108 | spin_unlock_irqrestore(&cpcmd_lock, flags); | |
1da177e4 | 109 | } |
6b979de3 | 110 | return len; |
1da177e4 LT |
111 | } |
112 | ||
113 | EXPORT_SYMBOL(cpcmd); |