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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/*
* memory.c: PROM library functions for acquiring/using memory descriptors
* given to us from the ARCS firmware.
*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
*
* $Id: memory.c,v 1.10 2000/01/27 23:21:57 ralf Exp $
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/swap.h>
#include <asm/sgialib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#undef DEBUG
struct linux_mdesc * __init
ArcGetMemoryDescriptor(struct linux_mdesc *Current)
{
return romvec->get_mdesc(Current);
}
#ifdef DEBUG /* convenient for debugging */
static char *arcs_mtypes[8] = {
"Exception Block",
"ARCS Romvec Page",
"Free/Contig RAM",
"Generic Free RAM",
"Bad Memory",
"Standlong Program Pages",
"ARCS Temp Storage Area",
"ARCS Permanent Storage Area"
};
static char *arc_mtypes[8] = {
"Exception Block",
"SystemParameterBlock",
"FreeMemory",
"Bad Memory",
"LoadedProgram",
"FirmwareTemporary",
"FirmwarePermanent",
"FreeContigiuous"
};
#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] : arc_mtypes[a.arc]
#endif
static struct prom_pmemblock pblocks[PROM_MAX_PMEMBLOCKS];
#define MEMTYPE_DONTUSE 0
#define MEMTYPE_PROM 1
#define MEMTYPE_FREE 2
static inline int memtype_classify_arcs (union linux_memtypes type)
{
switch (type.arcs) {
case arcs_fcontig:
case arcs_free:
return MEMTYPE_FREE;
case arcs_atmp:
return MEMTYPE_PROM;
case arcs_eblock:
case arcs_rvpage:
case arcs_bmem:
case arcs_prog:
case arcs_aperm:
return MEMTYPE_DONTUSE;
default:
BUG();
}
while(1); /* Nuke warning. */
}
static inline int memtype_classify_arc (union linux_memtypes type)
{
switch (type.arc) {
case arc_free:
case arc_fcontig:
return MEMTYPE_FREE;
case arc_atmp:
return MEMTYPE_PROM;
case arc_eblock:
case arc_rvpage:
case arc_bmem:
case arc_prog:
case arc_aperm:
return MEMTYPE_DONTUSE;
default:
BUG();
}
while(1); /* Nuke warning. */
}
static int __init prom_memtype_classify (union linux_memtypes type)
{
if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
return memtype_classify_arcs(type);
return memtype_classify_arc(type);
}
static inline unsigned long find_max_low_pfn(void)
{
struct prom_pmemblock *p, *highest;
unsigned long pfn;
p = pblocks;
highest = 0;
while (p->size != 0) {
if (!highest || p->base > highest->base)
highest = p;
p++;
}
pfn = (highest->base + highest->size) >> PAGE_SHIFT;
#ifdef DEBUG
prom_printf("find_max_low_pfn: 0x%lx pfns.\n", pfn);
#endif
return pfn;
}
static inline struct prom_pmemblock *find_largest_memblock(void)
{
struct prom_pmemblock *p, *largest;
p = pblocks;
largest = 0;
while (p->size != 0) {
if (!largest || p->size > largest->size)
largest = p;
p++;
}
return largest;
}
void __init prom_meminit(void)
{
struct prom_pmemblock *largest;
unsigned long bootmap_size;
struct linux_mdesc *p;
int totram;
int i = 0;
#ifdef DEBUG
prom_printf("ARCS MEMORY DESCRIPTOR dump:\n");
p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
while(p) {
prom_printf("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
i, p, p->base, p->pages, mtypes(p->type));
p = ArcGetMemoryDescriptor(p);
i++;
}
#endif
totram = 0;
i = 0;
p = PROM_NULL_MDESC;
while ((p = ArcGetMemoryDescriptor(p))) {
pblocks[i].type = prom_memtype_classify(p->type);
pblocks[i].base = p->base << PAGE_SHIFT;
pblocks[i].size = p->pages << PAGE_SHIFT;
switch (pblocks[i].type) {
case MEMTYPE_FREE:
totram += pblocks[i].size;
#ifdef DEBUG
prom_printf("free_chunk[%d]: base=%08lx size=%x\n",
i, pblocks[i].base,
pblocks[i].size);
#endif
i++;
break;
case MEMTYPE_PROM:
#ifdef DEBUG
prom_printf("prom_chunk[%d]: base=%08lx size=%x\n",
i, pblocks[i].base,
pblocks[i].size);
#endif
i++;
break;
default:
break;
}
}
pblocks[i].size = 0;
max_low_pfn = find_max_low_pfn();
largest = find_largest_memblock();
bootmap_size = init_bootmem(largest->base >> PAGE_SHIFT, max_low_pfn);
for (i = 0; pblocks[i].size; i++)
if (pblocks[i].type == MEMTYPE_FREE)
free_bootmem(pblocks[i].base, pblocks[i].size);
/* This test is simpleminded. It will fail if the bootmem bitmap
falls into multiple adjacent ARC memory areas. */
if (bootmap_size > largest->size) {
prom_printf("CRITIAL: overwriting PROM data.\n");
BUG();
}
/* Reserve the memory bootmap itself */
reserve_bootmem(largest->base, bootmap_size);
printk("PROMLIB: Total free ram %dK / %dMB.\n",
totram >> 10, totram >> 20);
}
void __init
prom_free_prom_memory (void)
{
struct prom_pmemblock *p;
unsigned long freed = 0;
unsigned long addr;
for (p = pblocks; p->size != 0; p++) {
if (p->type != MEMTYPE_PROM)
continue;
addr = PAGE_OFFSET + p->base;
while (addr < p->base + p->size) {
ClearPageReserved(mem_map + MAP_NR(addr));
set_page_count(mem_map + MAP_NR(addr), 1);
free_page(addr);
addr += PAGE_SIZE;
freed += PAGE_SIZE;
}
}
printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
}
|
