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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/s390/kernel/cpcmd.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/s390/kernel/cpcmd.c')
-rw-r--r--arch/s390/kernel/cpcmd.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c
new file mode 100644
index 000000000000..44df8dc07c59
--- /dev/null
+++ b/arch/s390/kernel/cpcmd.c
@@ -0,0 +1,111 @@
1/*
2 * arch/s390/kernel/cpcmd.c
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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>
19
20static DEFINE_SPINLOCK(cpcmd_lock);
21static char cpcmd_buf[240];
22
23/*
24 * the caller of __cpcmd has to ensure that the response buffer is below 2 GB
25 */
26void __cpcmd(char *cmd, char *response, int rlen)
27{
28 const int mask = 0x40000000L;
29 unsigned long flags;
30 int cmdlen;
31
32 spin_lock_irqsave(&cpcmd_lock, flags);
33 cmdlen = strlen(cmd);
34 BUG_ON(cmdlen > 240);
35 strcpy(cpcmd_buf, cmd);
36 ASCEBC(cpcmd_buf, cmdlen);
37
38 if (response != NULL && rlen > 0) {
39 memset(response, 0, rlen);
40#ifndef CONFIG_ARCH_S390X
41 asm volatile ("LRA 2,0(%0)\n\t"
42 "LR 4,%1\n\t"
43 "O 4,%4\n\t"
44 "LRA 3,0(%2)\n\t"
45 "LR 5,%3\n\t"
46 ".long 0x83240008 # Diagnose X'08'\n\t"
47 : /* no output */
48 : "a" (cpcmd_buf), "d" (cmdlen),
49 "a" (response), "d" (rlen), "m" (mask)
50 : "cc", "2", "3", "4", "5" );
51#else /* CONFIG_ARCH_S390X */
52 asm volatile (" lrag 2,0(%0)\n"
53 " lgr 4,%1\n"
54 " o 4,%4\n"
55 " lrag 3,0(%2)\n"
56 " lgr 5,%3\n"
57 " sam31\n"
58 " .long 0x83240008 # Diagnose X'08'\n"
59 " sam64"
60 : /* no output */
61 : "a" (cpcmd_buf), "d" (cmdlen),
62 "a" (response), "d" (rlen), "m" (mask)
63 : "cc", "2", "3", "4", "5" );
64#endif /* CONFIG_ARCH_S390X */
65 EBCASC(response, rlen);
66 } else {
67#ifndef CONFIG_ARCH_S390X
68 asm volatile ("LRA 2,0(%0)\n\t"
69 "LR 3,%1\n\t"
70 ".long 0x83230008 # Diagnose X'08'\n\t"
71 : /* no output */
72 : "a" (cpcmd_buf), "d" (cmdlen)
73 : "2", "3" );
74#else /* CONFIG_ARCH_S390X */
75 asm volatile (" lrag 2,0(%0)\n"
76 " lgr 3,%1\n"
77 " sam31\n"
78 " .long 0x83230008 # Diagnose X'08'\n"
79 " sam64"
80 : /* no output */
81 : "a" (cpcmd_buf), "d" (cmdlen)
82 : "2", "3" );
83#endif /* CONFIG_ARCH_S390X */
84 }
85 spin_unlock_irqrestore(&cpcmd_lock, flags);
86}
87
88EXPORT_SYMBOL(__cpcmd);
89
90#ifdef CONFIG_ARCH_S390X
91void cpcmd(char *cmd, char *response, int rlen)
92{
93 char *lowbuf;
94 if ((rlen == 0) || (response == NULL)
95 || !((unsigned long)response >> 31))
96 __cpcmd(cmd, response, rlen);
97 else {
98 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
99 if (!lowbuf) {
100 printk(KERN_WARNING
101 "cpcmd: could not allocate response buffer\n");
102 return;
103 }
104 __cpcmd(cmd, lowbuf, rlen);
105 memcpy(response, lowbuf, rlen);
106 kfree(lowbuf);
107 }
108}
109
110EXPORT_SYMBOL(cpcmd);
111#endif /* CONFIG_ARCH_S390X */