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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/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 measuring memory is always
36 * a 4k page of memory
37 */
38#define ARC_PAGE_SHIFT 12
39
40static struct 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
71enum {
72 mem_free, mem_prom_used, mem_reserved
73};
74
75static inline int memtype_classify_arcs(union linux_memtypes type)
76{
77 switch (type.arcs) {
78 case arcs_fcontig:
79 case arcs_free:
80 return mem_free;
81 case arcs_atmp:
82 return mem_prom_used;
83 case arcs_eblock:
84 case arcs_rvpage:
85 case arcs_bmem:
86 case arcs_prog:
87 case arcs_aperm:
88 return mem_reserved;
89 default:
90 BUG();
91 }
92 while(1); /* Nuke warning. */
93}
94
95static inline int memtype_classify_arc(union linux_memtypes type)
96{
97 switch (type.arc) {
98 case arc_free:
99 case arc_fcontig:
100 return mem_free;
101 case arc_atmp:
102 return mem_prom_used;
103 case arc_eblock:
104 case arc_rvpage:
105 case arc_bmem:
106 case arc_prog:
107 case arc_aperm:
108 return mem_reserved;
109 default:
110 BUG();
111 }
112 while(1); /* Nuke warning. */
113}
114
115static int __init prom_memtype_classify(union linux_memtypes type)
116{
117 if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
118 return memtype_classify_arcs(type);
119
120 return memtype_classify_arc(type);
121}
122
123void __weak __init prom_meminit(void)
124{
125 struct linux_mdesc *p;
126
127#ifdef DEBUG
128 int i = 0;
129
130 printk("ARCS MEMORY DESCRIPTOR dump:\n");
131 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
132 while(p) {
133 printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
134 i, p, p->base, p->pages, mtypes(p->type));
135 p = ArcGetMemoryDescriptor(p);
136 i++;
137 }
138#endif
139
140 nr_prom_mem = 0;
141 p = PROM_NULL_MDESC;
142 while ((p = ArcGetMemoryDescriptor(p))) {
143 unsigned long base, size;
144 long type;
145
146 base = p->base << ARC_PAGE_SHIFT;
147 size = p->pages << ARC_PAGE_SHIFT;
148 type = prom_memtype_classify(p->type);
149
150 /* ignore mirrored RAM on IP28/IP30 */
151 if (base < PHYS_OFFSET)
152 continue;
153
154 memblock_add(base, size);
155
156 if (type == mem_reserved)
157 memblock_reserve(base, size);
158
159 if (type == mem_prom_used) {
160 memblock_reserve(base, size);
161 if (nr_prom_mem >= 5) {
162 pr_err("Too many ROM DATA regions");
163 continue;
164 }
165 prom_mem_base[nr_prom_mem] = base;
166 prom_mem_size[nr_prom_mem] = size;
167 nr_prom_mem++;
168 }
169 }
170}
171
172void __weak __init prom_cleanup(void)
173{
174}
175
176void __init prom_free_prom_memory(void)
177{
178 int i;
179
180 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
181 return;
182
183 for (i = 0; i < nr_prom_mem; i++) {
184 free_init_pages("prom memory",
185 prom_mem_base[i], prom_mem_base[i] + prom_mem_size[i]);
186 }
187 /*
188 * at this point it isn't safe to call PROM functions
189 * give platforms a way to do PROM cleanups
190 */
191 prom_cleanup();
192}
1/*
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 * completely 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
66static inline int memtype_classify_arcs(union linux_memtypes type)
67{
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
86static inline int memtype_classify_arc(union linux_memtypes type)
87{
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
106static int __init prom_memtype_classify(union linux_memtypes type)
107{
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
121 printk("ARCS MEMORY DESCRIPTOR dump:\n");
122 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
123 while(p) {
124 printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
125 i, p, p->base, p->pages, mtypes(p->type));
126 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
144void __init prom_free_prom_memory(void)
145{
146 unsigned long addr;
147 int i;
148
149 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
150 return;
151
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;
157 free_init_pages("prom memory",
158 addr, addr + boot_mem_map.map[i].size);
159 }
160}