1 /*
2 * HvCall.c
3 * Copyright (C) 2001 Mike Corrigan IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/slab.h>
15 #include <asm/system.h>
16 #include <asm/page.h>
17 #include <asm/iSeries/HvCall.h>
18 #ifndef _HVCALLSC_H
19 #include <asm/iSeries/HvCallSc.h>
20 #endif
21 #include <asm/iSeries/LparData.h>
22
23 #ifndef _HVTYPES_H
24 #include <asm/iSeries/HvTypes.h>
25 #endif
26
27
28 /*=====================================================================
29 * Note that this call takes at MOST one page worth of data
30 */
HvCall_readLogBuffer(HvLpIndex lpIndex,void * buffer,u64 bufLen)31 int HvCall_readLogBuffer(HvLpIndex lpIndex, void *buffer, u64 bufLen)
32 {
33 struct HvLpBufferList *bufList;
34 u64 bytesLeft = bufLen;
35 u64 leftThisPage;
36 u64 curPtr = virt_to_absolute( (unsigned long) buffer );
37 u64 retVal;
38 int npages;
39 int i;
40
41 npages = 0;
42 while (bytesLeft) {
43 npages++;
44 leftThisPage = ((curPtr & PAGE_MASK) + PAGE_SIZE) - curPtr;
45
46 if (leftThisPage > bytesLeft)
47 bytesLeft = 0;
48 else
49 bytesLeft -= leftThisPage;
50
51 curPtr = (curPtr & PAGE_MASK) + PAGE_SIZE;
52 }
53
54 if (npages == 0)
55 return 0;
56
57 bufList = (struct HvLpBufferList *)
58 kmalloc(npages * sizeof(struct HvLpBufferList), GFP_ATOMIC);
59 bytesLeft = bufLen;
60 curPtr = virt_to_absolute( (unsigned long) buffer );
61 for(i=0; i<npages; i++) {
62 bufList[i].addr = curPtr;
63
64 leftThisPage = ((curPtr & PAGE_MASK) + PAGE_SIZE) - curPtr;
65
66 if (leftThisPage > bytesLeft) {
67 bufList[i].len = bytesLeft;
68 bytesLeft = 0;
69 } else {
70 bufList[i].len = leftThisPage;
71 bytesLeft -= leftThisPage;
72 }
73
74 curPtr = (curPtr & PAGE_MASK) + PAGE_SIZE;
75 }
76
77
78 retVal = HvCall3(HvCallBaseReadLogBuffer, lpIndex,
79 virt_to_absolute((unsigned long)bufList), bufLen);
80
81 kfree(bufList);
82
83 return (int)retVal;
84 }
85
86 /*=====================================================================
87 */
HvCall_writeLogBuffer(const void * buffer,u64 bufLen)88 void HvCall_writeLogBuffer(const void *buffer, u64 bufLen)
89 {
90 struct HvLpBufferList bufList;
91 u64 bytesLeft = bufLen;
92 u64 leftThisPage;
93 u64 curPtr = virt_to_absolute((unsigned long) buffer);
94
95 while (bytesLeft) {
96 bufList.addr = curPtr;
97
98 leftThisPage = ((curPtr & PAGE_MASK) + PAGE_SIZE) - curPtr;
99
100 if (leftThisPage > bytesLeft) {
101 bufList.len = bytesLeft;
102 bytesLeft = 0;
103 } else {
104 bufList.len = leftThisPage;
105 bytesLeft -= leftThisPage;
106 }
107
108
109 HvCall2(HvCallBaseWriteLogBuffer,
110 virt_to_absolute((unsigned long) &bufList),
111 bufList.len);
112
113 curPtr = (curPtr & PAGE_MASK) + PAGE_SIZE;
114 }
115 }
116