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
31 static phys_addr_t prom_mem_base[MAX_PROM_MEM] __initdata;
32 static phys_addr_t prom_mem_size[MAX_PROM_MEM] __initdata;
33 static 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
ArcGetMemoryDescriptor(struct linux_mdesc * Current)41 struct 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 */
47 static 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
58 static 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
memtype_classify_arcs(union linux_memtypes type)72 static 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
memtype_classify_arc(union linux_memtypes type)92 static 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
prom_memtype_classify(union linux_memtypes type)112 static 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
prom_meminit(void)120 void __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
prom_free_prom_memory(void)161 void __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 }
173