2 * memory.c: PROM library functions for acquiring/using memory descriptors
3 * given to us from the ARCS firmware.
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.
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 * completly bogus and alternate easier to use mechanisms are available.
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/sched.h>
19 #include <linux/bootmem.h>
20 #include <linux/swap.h>
22 #include <asm/sgialib.h>
24 #include <asm/pgtable.h>
25 #include <asm/bootinfo.h>
30 * For ARC firmware memory functions the unit of meassuring memory is always
33 #define ARC_PAGE_SHIFT 12
35 struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
37 return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
40 #ifdef DEBUG /* convenient for debugging */
41 static char *arcs_mtypes[8] = {
47 "Standalone Program Pages",
48 "ARCS Temp Storage Area",
49 "ARCS Permanent Storage Area"
52 static char *arc_mtypes[8] = {
54 "SystemParameterBlock",
62 #define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
66 static inline int memtype_classify_arcs (union linux_memtypes type)
73 return BOOT_MEM_ROM_DATA;
79 return BOOT_MEM_RESERVED;
83 while(1); /* Nuke warning. */
86 static inline int memtype_classify_arc (union linux_memtypes type)
93 return BOOT_MEM_ROM_DATA;
99 return BOOT_MEM_RESERVED;
103 while(1); /* Nuke warning. */
106 static int __init prom_memtype_classify (union linux_memtypes type)
108 if (prom_flags & PROM_FLAG_ARCS) /* SGI is ``different'' ... */
109 return memtype_classify_arcs(type);
111 return memtype_classify_arc(type);
114 void __init prom_meminit(void)
116 struct linux_mdesc *p;
121 prom_printf("ARCS MEMORY DESCRIPTOR dump:\n");
122 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
124 prom_printf("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
125 i, p, p->base, p->pages, mtypes(p->type));
126 p = ArcGetMemoryDescriptor(p);
132 while ((p = ArcGetMemoryDescriptor(p))) {
133 unsigned long base, size;
136 base = p->base << ARC_PAGE_SHIFT;
137 size = p->pages << ARC_PAGE_SHIFT;
138 type = prom_memtype_classify(p->type);
140 add_memory_region(base, size, type);
144 unsigned long __init prom_free_prom_memory(void)
146 unsigned long freed = 0;
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 while (addr < boot_mem_map.map[i].addr
159 + boot_mem_map.map[i].size) {
160 ClearPageReserved(virt_to_page(__va(addr)));
161 init_page_count(virt_to_page(__va(addr)));
162 free_page((unsigned long)__va(addr));
167 printk(KERN_INFO "Freeing prom memory: %ldkb freed\n", freed >> 10);