ia64/linux-2.6.18-xen.hg

view arch/mips/arc/memory.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
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 * completly 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>
22 #include <asm/sgialib.h>
23 #include <asm/page.h>
24 #include <asm/pgtable.h>
25 #include <asm/bootinfo.h>
27 #undef DEBUG
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
35 struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
36 {
37 return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
38 }
40 #ifdef DEBUG /* convenient for debugging */
41 static 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 };
52 static 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
66 static 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 }
86 static 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 }
106 static 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);
111 return memtype_classify_arc(type);
112 }
114 void __init prom_meminit(void)
115 {
116 struct linux_mdesc *p;
118 #ifdef DEBUG
119 int i = 0;
121 prom_printf("ARCS MEMORY DESCRIPTOR dump:\n");
122 p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
123 while(p) {
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);
127 i++;
128 }
129 #endif
131 p = PROM_NULL_MDESC;
132 while ((p = ArcGetMemoryDescriptor(p))) {
133 unsigned long base, size;
134 long type;
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);
141 }
142 }
144 unsigned long __init prom_free_prom_memory(void)
145 {
146 unsigned long freed = 0;
147 unsigned long addr;
148 int i;
150 if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
151 return 0;
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;
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));
163 addr += PAGE_SIZE;
164 freed += PAGE_SIZE;
165 }
166 }
167 printk(KERN_INFO "Freeing prom memory: %ldkb freed\n", freed >> 10);
169 return freed;
170 }