1 // SPDX-License-Identifier: GPL-2.0
3 * memory.c: PROM library functions for acquiring/using memory descriptors
4 * given to us from the ARCS firmware.
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.
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.
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/sched.h>
20 #include <linux/bootmem.h>
21 #include <linux/swap.h>
23 #include <asm/sgialib.h>
25 #include <asm/pgtable.h>
26 #include <asm/bootinfo.h>
31 * For ARC firmware memory functions the unit of meassuring memory is always
34 #define ARC_PAGE_SHIFT 12
36 struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
38 return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
41 #ifdef DEBUG /* convenient for debugging */
42 static char *arcs_mtypes[8] = {
48 "Standalone Program Pages",
49 "ARCS Temp Storage Area",
50 "ARCS Permanent Storage Area"
53 static char *arc_mtypes[8] = {
55 "SystemParameterBlock",
63 #define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
67 static inline int memtype_classify_arcs(union linux_memtypes type)
74 return BOOT_MEM_ROM_DATA;
80 return BOOT_MEM_RESERVED;
84 while(1); /* Nuke warning. */
87 static inline int memtype_classify_arc(union linux_memtypes type)
94 return BOOT_MEM_ROM_DATA;
100 return BOOT_MEM_RESERVED;
104 while(1); /* Nuke warning. */
107 static int __init prom_memtype_classify(union linux_memtypes type)
109 if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
110 return memtype_classify_arcs(type);
112 return memtype_classify_arc(type);
115 void __init prom_meminit(void)
117 struct linux_mdesc *p;
122 printk("ARCS MEMORY DESCRIPTOR dump:\n");
123 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
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);
133 while ((p = ArcGetMemoryDescriptor(p))) {
134 unsigned long base, size;
137 base = p->base << ARC_PAGE_SHIFT;
138 size = p->pages << ARC_PAGE_SHIFT;
139 type = prom_memtype_classify(p->type);
141 add_memory_region(base, size, type);
145 void __init prom_free_prom_memory(void)
150 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
153 for (i = 0; i < boot_mem_map.nr_map; i++) {
154 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
157 addr = boot_mem_map.map[i].addr;
158 free_init_pages("prom memory",
159 addr, addr + boot_mem_map.map[i].size);