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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/pgtable.h>
26#include <asm/bootinfo.h>
27
28#undef DEBUG
29
30#define MAX_PROM_MEM 5
31static phys_addr_t prom_mem_base[MAX_PROM_MEM] __initdata;
32static phys_addr_t prom_mem_size[MAX_PROM_MEM] __initdata;
33static unsigned int nr_prom_mem __initdata;
34
35/*
36 * For ARC firmware memory functions the unit of meassuring memory is always
37 * a 4k page of memory
38 */
39#define ARC_PAGE_SHIFT 12
40
41struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
42{
43 return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
44}
45
46#ifdef DEBUG /* convenient for debugging */
47static char *arcs_mtypes[8] = {
48 "Exception Block",
49 "ARCS Romvec Page",
50 "Free/Contig RAM",
51 "Generic Free RAM",
52 "Bad Memory",
53 "Standalone Program Pages",
54 "ARCS Temp Storage Area",
55 "ARCS Permanent Storage Area"
56};
57
58static char *arc_mtypes[8] = {
59 "Exception Block",
60 "SystemParameterBlock",
61 "FreeMemory",
62 "Bad Memory",
63 "LoadedProgram",
64 "FirmwareTemporary",
65 "FirmwarePermanent",
66 "FreeContiguous"
67};
68#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
69 : arc_mtypes[a.arc]
70#endif
71
72static inline int memtype_classify_arcs(union linux_memtypes type)
73{
74 switch (type.arcs) {
75 case arcs_fcontig:
76 case arcs_free:
77 return BOOT_MEM_RAM;
78 case arcs_atmp:
79 return BOOT_MEM_ROM_DATA;
80 case arcs_eblock:
81 case arcs_rvpage:
82 case arcs_bmem:
83 case arcs_prog:
84 case arcs_aperm:
85 return BOOT_MEM_RESERVED;
86 default:
87 BUG();
88 }
89 while(1); /* Nuke warning. */
90}
91
92static inline int memtype_classify_arc(union linux_memtypes type)
93{
94 switch (type.arc) {
95 case arc_free:
96 case arc_fcontig:
97 return BOOT_MEM_RAM;
98 case arc_atmp:
99 return BOOT_MEM_ROM_DATA;
100 case arc_eblock:
101 case arc_rvpage:
102 case arc_bmem:
103 case arc_prog:
104 case arc_aperm:
105 return BOOT_MEM_RESERVED;
106 default:
107 BUG();
108 }
109 while(1); /* Nuke warning. */
110}
111
112static int __init prom_memtype_classify(union linux_memtypes type)
113{
114 if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
115 return memtype_classify_arcs(type);
116
117 return memtype_classify_arc(type);
118}
119
120void __init prom_meminit(void)
121{
122 struct linux_mdesc *p;
123
124#ifdef DEBUG
125 int i = 0;
126
127 printk("ARCS MEMORY DESCRIPTOR dump:\n");
128 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
129 while(p) {
130 printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
131 i, p, p->base, p->pages, mtypes(p->type));
132 p = ArcGetMemoryDescriptor(p);
133 i++;
134 }
135#endif
136
137 nr_prom_mem = 0;
138 p = PROM_NULL_MDESC;
139 while ((p = ArcGetMemoryDescriptor(p))) {
140 unsigned long base, size;
141 long type;
142
143 base = p->base << ARC_PAGE_SHIFT;
144 size = p->pages << ARC_PAGE_SHIFT;
145 type = prom_memtype_classify(p->type);
146
147 add_memory_region(base, size, type);
148
149 if (type == BOOT_MEM_ROM_DATA) {
150 if (nr_prom_mem >= 5) {
151 pr_err("Too many ROM DATA regions");
152 continue;
153 }
154 prom_mem_base[nr_prom_mem] = base;
155 prom_mem_size[nr_prom_mem] = size;
156 nr_prom_mem++;
157 }
158 }
159}
160
161void __init prom_free_prom_memory(void)
162{
163 int i;
164
165 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
166 return;
167
168 for (i = 0; i < nr_prom_mem; i++) {
169 free_init_pages("prom memory",
170 prom_mem_base[i], prom_mem_base[i] + prom_mem_size[i]);
171 }
172}