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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * memory.c: PROM library functions for acquiring/using memory descriptors
4 * given to us from the ARCS firmware.
5 *
6 * Copyright (C) 1996 by David S. Miller
7 * Copyright (C) 1999, 2000, 2001 by Ralf Baechle
8 * Copyright (C) 1999, 2000 by Silicon Graphics, Inc.
9 *
10 * PROM library functions for acquiring/using memory descriptors given to us
11 * from the ARCS firmware. This is only used when CONFIG_ARC_MEMORY is set
12 * because on some machines like SGI IP27 the ARC memory configuration data
13 * completely bogus and alternate easier to use mechanisms are available.
14 */
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/sched.h>
19#include <linux/mm.h>
20#include <linux/bootmem.h>
21#include <linux/swap.h>
22
23#include <asm/sgialib.h>
24#include <asm/page.h>
25#include <asm/pgtable.h>
26#include <asm/bootinfo.h>
27
28#undef DEBUG
29
30/*
31 * For ARC firmware memory functions the unit of meassuring memory is always
32 * a 4k page of memory
33 */
34#define ARC_PAGE_SHIFT 12
35
36struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
37{
38 return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
39}
40
41#ifdef DEBUG /* convenient for debugging */
42static char *arcs_mtypes[8] = {
43 "Exception Block",
44 "ARCS Romvec Page",
45 "Free/Contig RAM",
46 "Generic Free RAM",
47 "Bad Memory",
48 "Standalone Program Pages",
49 "ARCS Temp Storage Area",
50 "ARCS Permanent Storage Area"
51};
52
53static char *arc_mtypes[8] = {
54 "Exception Block",
55 "SystemParameterBlock",
56 "FreeMemory",
57 "Bad Memory",
58 "LoadedProgram",
59 "FirmwareTemporary",
60 "FirmwarePermanent",
61 "FreeContiguous"
62};
63#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
64 : arc_mtypes[a.arc]
65#endif
66
67static inline int memtype_classify_arcs(union linux_memtypes type)
68{
69 switch (type.arcs) {
70 case arcs_fcontig:
71 case arcs_free:
72 return BOOT_MEM_RAM;
73 case arcs_atmp:
74 return BOOT_MEM_ROM_DATA;
75 case arcs_eblock:
76 case arcs_rvpage:
77 case arcs_bmem:
78 case arcs_prog:
79 case arcs_aperm:
80 return BOOT_MEM_RESERVED;
81 default:
82 BUG();
83 }
84 while(1); /* Nuke warning. */
85}
86
87static inline int memtype_classify_arc(union linux_memtypes type)
88{
89 switch (type.arc) {
90 case arc_free:
91 case arc_fcontig:
92 return BOOT_MEM_RAM;
93 case arc_atmp:
94 return BOOT_MEM_ROM_DATA;
95 case arc_eblock:
96 case arc_rvpage:
97 case arc_bmem:
98 case arc_prog:
99 case arc_aperm:
100 return BOOT_MEM_RESERVED;
101 default:
102 BUG();
103 }
104 while(1); /* Nuke warning. */
105}
106
107static int __init prom_memtype_classify(union linux_memtypes type)
108{
109 if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
110 return memtype_classify_arcs(type);
111
112 return memtype_classify_arc(type);
113}
114
115void __init prom_meminit(void)
116{
117 struct linux_mdesc *p;
118
119#ifdef DEBUG
120 int i = 0;
121
122 printk("ARCS MEMORY DESCRIPTOR dump:\n");
123 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
124 while(p) {
125 printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
126 i, p, p->base, p->pages, mtypes(p->type));
127 p = ArcGetMemoryDescriptor(p);
128 i++;
129 }
130#endif
131
132 p = PROM_NULL_MDESC;
133 while ((p = ArcGetMemoryDescriptor(p))) {
134 unsigned long base, size;
135 long type;
136
137 base = p->base << ARC_PAGE_SHIFT;
138 size = p->pages << ARC_PAGE_SHIFT;
139 type = prom_memtype_classify(p->type);
140
141 add_memory_region(base, size, type);
142 }
143}
144
145void __init prom_free_prom_memory(void)
146{
147 unsigned long addr;
148 int i;
149
150 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
151 return;
152
153 for (i = 0; i < boot_mem_map.nr_map; i++) {
154 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
155 continue;
156
157 addr = boot_mem_map.map[i].addr;
158 free_init_pages("prom memory",
159 addr, addr + boot_mem_map.map[i].size);
160 }
161}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * memory.c: PROM library functions for acquiring/using memory descriptors
4 * given to us from the ARCS firmware.
5 *
6 * Copyright (C) 1996 by David S. Miller
7 * Copyright (C) 1999, 2000, 2001 by Ralf Baechle
8 * Copyright (C) 1999, 2000 by Silicon Graphics, Inc.
9 *
10 * PROM library functions for acquiring/using memory descriptors given to us
11 * from the ARCS firmware. This is only used when CONFIG_ARC_MEMORY is set
12 * because on some machines like SGI IP27 the ARC memory configuration data
13 * completely bogus and alternate easier to use mechanisms are available.
14 */
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/sched.h>
19#include <linux/mm.h>
20#include <linux/memblock.h>
21#include <linux/swap.h>
22
23#include <asm/sgialib.h>
24#include <asm/page.h>
25#include <asm/bootinfo.h>
26
27#undef DEBUG
28
29#define MAX_PROM_MEM 5
30static phys_addr_t prom_mem_base[MAX_PROM_MEM] __initdata;
31static phys_addr_t prom_mem_size[MAX_PROM_MEM] __initdata;
32static unsigned int nr_prom_mem __initdata;
33
34/*
35 * For ARC firmware memory functions the unit of meassuring memory is always
36 * a 4k page of memory
37 */
38#define ARC_PAGE_SHIFT 12
39
40struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
41{
42 return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
43}
44
45#ifdef DEBUG /* convenient for debugging */
46static char *arcs_mtypes[8] = {
47 "Exception Block",
48 "ARCS Romvec Page",
49 "Free/Contig RAM",
50 "Generic Free RAM",
51 "Bad Memory",
52 "Standalone Program Pages",
53 "ARCS Temp Storage Area",
54 "ARCS Permanent Storage Area"
55};
56
57static char *arc_mtypes[8] = {
58 "Exception Block",
59 "SystemParameterBlock",
60 "FreeMemory",
61 "Bad Memory",
62 "LoadedProgram",
63 "FirmwareTemporary",
64 "FirmwarePermanent",
65 "FreeContiguous"
66};
67#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
68 : arc_mtypes[a.arc]
69#endif
70
71static inline int memtype_classify_arcs(union linux_memtypes type)
72{
73 switch (type.arcs) {
74 case arcs_fcontig:
75 case arcs_free:
76 return BOOT_MEM_RAM;
77 case arcs_atmp:
78 return BOOT_MEM_ROM_DATA;
79 case arcs_eblock:
80 case arcs_rvpage:
81 case arcs_bmem:
82 case arcs_prog:
83 case arcs_aperm:
84 return BOOT_MEM_RESERVED;
85 default:
86 BUG();
87 }
88 while(1); /* Nuke warning. */
89}
90
91static inline int memtype_classify_arc(union linux_memtypes type)
92{
93 switch (type.arc) {
94 case arc_free:
95 case arc_fcontig:
96 return BOOT_MEM_RAM;
97 case arc_atmp:
98 return BOOT_MEM_ROM_DATA;
99 case arc_eblock:
100 case arc_rvpage:
101 case arc_bmem:
102 case arc_prog:
103 case arc_aperm:
104 return BOOT_MEM_RESERVED;
105 default:
106 BUG();
107 }
108 while(1); /* Nuke warning. */
109}
110
111static int __init prom_memtype_classify(union linux_memtypes type)
112{
113 if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
114 return memtype_classify_arcs(type);
115
116 return memtype_classify_arc(type);
117}
118
119void __weak __init prom_meminit(void)
120{
121 struct linux_mdesc *p;
122
123#ifdef DEBUG
124 int i = 0;
125
126 printk("ARCS MEMORY DESCRIPTOR dump:\n");
127 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
128 while(p) {
129 printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
130 i, p, p->base, p->pages, mtypes(p->type));
131 p = ArcGetMemoryDescriptor(p);
132 i++;
133 }
134#endif
135
136 nr_prom_mem = 0;
137 p = PROM_NULL_MDESC;
138 while ((p = ArcGetMemoryDescriptor(p))) {
139 unsigned long base, size;
140 long type;
141
142 base = p->base << ARC_PAGE_SHIFT;
143 size = p->pages << ARC_PAGE_SHIFT;
144 type = prom_memtype_classify(p->type);
145
146 add_memory_region(base, size, type);
147
148 if (type == BOOT_MEM_ROM_DATA) {
149 if (nr_prom_mem >= 5) {
150 pr_err("Too many ROM DATA regions");
151 continue;
152 }
153 prom_mem_base[nr_prom_mem] = base;
154 prom_mem_size[nr_prom_mem] = size;
155 nr_prom_mem++;
156 }
157 }
158}
159
160void __weak __init prom_cleanup(void)
161{
162}
163
164void __weak __init prom_free_prom_memory(void)
165{
166 int i;
167
168 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
169 return;
170
171 for (i = 0; i < nr_prom_mem; i++) {
172 free_init_pages("prom memory",
173 prom_mem_base[i], prom_mem_base[i] + prom_mem_size[i]);
174 }
175 /*
176 * at this point it isn't safe to call PROM functions
177 * give platforms a way to do PROM cleanups
178 */
179 prom_cleanup();
180}