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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * memory.c: PROM library functions for acquiring/using memory descriptors
3 * given to us from the ARCS firmware.
4 *
5 * Copyright (C) 1996 by David S. Miller
6 * Copyright (C) 1999, 2000, 2001 by Ralf Baechle
7 * Copyright (C) 1999, 2000 by Silicon Graphics, Inc.
8 *
9 * PROM library functions for acquiring/using memory descriptors given to us
10 * from the ARCS firmware. This is only used when CONFIG_ARC_MEMORY is set
11 * because on some machines like SGI IP27 the ARC memory configuration data
12 * completly bogus and alternate easier to use mechanisms are available.
13 */
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/sched.h>
18#include <linux/mm.h>
19#include <linux/bootmem.h>
20#include <linux/swap.h>
21
22#include <asm/sgialib.h>
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/bootinfo.h>
26
27#undef DEBUG
28
29/*
30 * For ARC firmware memory functions the unit of meassuring memory is always
31 * a 4k page of memory
32 */
33#define ARC_PAGE_SHIFT 12
34
35struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
36{
37 return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
38}
39
40#ifdef DEBUG /* convenient for debugging */
41static char *arcs_mtypes[8] = {
42 "Exception Block",
43 "ARCS Romvec Page",
44 "Free/Contig RAM",
45 "Generic Free RAM",
46 "Bad Memory",
47 "Standalone Program Pages",
48 "ARCS Temp Storage Area",
49 "ARCS Permanent Storage Area"
50};
51
52static char *arc_mtypes[8] = {
53 "Exception Block",
54 "SystemParameterBlock",
55 "FreeMemory",
56 "Bad Memory",
57 "LoadedProgram",
58 "FirmwareTemporary",
59 "FirmwarePermanent",
60 "FreeContiguous"
61};
62#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
63 : arc_mtypes[a.arc]
64#endif
65
Ralf Baechle49a89ef2007-10-11 23:46:15 +010066static inline int memtype_classify_arcs(union linux_memtypes type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 switch (type.arcs) {
69 case arcs_fcontig:
70 case arcs_free:
71 return BOOT_MEM_RAM;
72 case arcs_atmp:
73 return BOOT_MEM_ROM_DATA;
74 case arcs_eblock:
75 case arcs_rvpage:
76 case arcs_bmem:
77 case arcs_prog:
78 case arcs_aperm:
79 return BOOT_MEM_RESERVED;
80 default:
81 BUG();
82 }
83 while(1); /* Nuke warning. */
84}
85
Ralf Baechle49a89ef2007-10-11 23:46:15 +010086static inline int memtype_classify_arc(union linux_memtypes type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
88 switch (type.arc) {
89 case arc_free:
90 case arc_fcontig:
91 return BOOT_MEM_RAM;
92 case arc_atmp:
93 return BOOT_MEM_ROM_DATA;
94 case arc_eblock:
95 case arc_rvpage:
96 case arc_bmem:
97 case arc_prog:
98 case arc_aperm:
99 return BOOT_MEM_RESERVED;
100 default:
101 BUG();
102 }
103 while(1); /* Nuke warning. */
104}
105
Ralf Baechle49a89ef2007-10-11 23:46:15 +0100106static int __init prom_memtype_classify(union linux_memtypes type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
108 if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
109 return memtype_classify_arcs(type);
110
111 return memtype_classify_arc(type);
112}
113
114void __init prom_meminit(void)
115{
116 struct linux_mdesc *p;
117
118#ifdef DEBUG
119 int i = 0;
120
Ralf Baechle36a88532007-03-01 11:56:43 +0000121 printk("ARCS MEMORY DESCRIPTOR dump:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
123 while(p) {
Ralf Baechle36a88532007-03-01 11:56:43 +0000124 printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
125 i, p, p->base, p->pages, mtypes(p->type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 p = ArcGetMemoryDescriptor(p);
127 i++;
128 }
129#endif
130
131 p = PROM_NULL_MDESC;
132 while ((p = ArcGetMemoryDescriptor(p))) {
133 unsigned long base, size;
134 long type;
135
136 base = p->base << ARC_PAGE_SHIFT;
137 size = p->pages << ARC_PAGE_SHIFT;
138 type = prom_memtype_classify(p->type);
139
140 add_memory_region(base, size, type);
141 }
142}
143
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900144void __init prom_free_prom_memory(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 unsigned long addr;
147 int i;
148
149 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900150 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 for (i = 0; i < boot_mem_map.nr_map; i++) {
153 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
154 continue;
155
156 addr = boot_mem_map.map[i].addr;
Atsushi Nemotoc44e8d52006-12-30 00:43:59 +0900157 free_init_pages("prom memory",
158 addr, addr + boot_mem_map.map[i].size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160}