1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*
** linux/amiga/chipram.c
**
** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
** - 64-bit aligned allocations for full AGA compatibility
**
** Rewritten 15/9/2000 by Geert to use resource management
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/module.h>
#include <asm/page.h>
#include <asm/amigahw.h>
unsigned long amiga_chip_size;
EXPORT_SYMBOL(amiga_chip_size);
static struct resource chipram_res = {
.name = "Chip RAM", .start = CHIP_PHYSADDR
};
static unsigned long chipavail;
void __init amiga_chip_init(void)
{
if (!AMIGAHW_PRESENT(CHIP_RAM))
return;
/*
* Remove the first 4 pages where PPC exception handlers will be located
*/
amiga_chip_size -= 0x4000;
chipram_res.end = amiga_chip_size-1;
request_resource(&iomem_resource, &chipram_res);
chipavail = amiga_chip_size;
}
void *amiga_chip_alloc(unsigned long size, const char *name)
{
struct resource *res;
/* round up */
size = PAGE_ALIGN(size);
#ifdef DEBUG
printk("amiga_chip_alloc: allocate %ld bytes\n", size);
#endif
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
if (!res)
return NULL;
res->name = name;
if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
kfree(res);
return NULL;
}
chipavail -= size;
#ifdef DEBUG
printk("amiga_chip_alloc: returning %lx\n", res->start);
#endif
return (void *)ZTWO_VADDR(res->start);
}
EXPORT_SYMBOL(amiga_chip_alloc);
/*
* Warning:
* amiga_chip_alloc_res is meant only for drivers that need to allocate
* Chip RAM before kmalloc() is functional. As a consequence, those
* drivers must not free that Chip RAM afterwards.
*/
void * __init amiga_chip_alloc_res(unsigned long size, struct resource *res)
{
unsigned long start;
/* round up */
size = PAGE_ALIGN(size);
/* dmesg into chipmem prefers memory at the safe end */
start = CHIP_PHYSADDR + chipavail - size;
#ifdef DEBUG
printk("amiga_chip_alloc_res: allocate %ld bytes\n", size);
#endif
if (allocate_resource(&chipram_res, res, size, start, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
printk("amiga_chip_alloc_res: first alloc failed!\n");
if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0)
return NULL;
}
chipavail -= size;
#ifdef DEBUG
printk("amiga_chip_alloc_res: returning %lx\n", res->start);
#endif
return (void *)ZTWO_VADDR(res->start);
}
void amiga_chip_free(void *ptr)
{
unsigned long start = ZTWO_PADDR(ptr);
struct resource **p, *res;
unsigned long size;
for (p = &chipram_res.child; (res = *p); p = &res->sibling) {
if (res->start != start)
continue;
*p = res->sibling;
size = res->end-start;
#ifdef DEBUG
printk("amiga_chip_free: free %ld bytes at %p\n", size, ptr);
#endif
chipavail += size;
kfree(res);
return;
}
printk("amiga_chip_free: trying to free nonexistent region at %p\n", ptr);
}
EXPORT_SYMBOL(amiga_chip_free);
unsigned long amiga_chip_avail(void)
{
#ifdef DEBUG
printk("amiga_chip_avail : %ld bytes\n", chipavail);
#endif
return chipavail;
}
EXPORT_SYMBOL(amiga_chip_avail);
|
