2 * linux/arch/m32r/mm/init.c
4 * Copyright (c) 2001, 2002 Hitoshi Yamamoto
6 * Some code taken from sh version.
7 * Copyright (C) 1999 Niibe Yutaka
8 * Based on linux/arch/i386/mm/init.c:
9 * Copyright (C) 1995 Linus Torvalds
12 #include <linux/init.h>
13 #include <linux/kernel.h>
15 #include <linux/pagemap.h>
16 #include <linux/bootmem.h>
17 #include <linux/swap.h>
18 #include <linux/highmem.h>
19 #include <linux/bitops.h>
20 #include <linux/nodemask.h>
21 #include <linux/pfn.h>
22 #include <linux/gfp.h>
23 #include <asm/types.h>
24 #include <asm/processor.h>
26 #include <asm/pgtable.h>
27 #include <asm/pgalloc.h>
28 #include <asm/mmu_context.h>
29 #include <asm/setup.h>
31 #include <asm/sections.h>
33 pgd_t swapper_pg_dir[1024];
36 * Cache of MMU context last used.
39 unsigned long mmu_context_cache_dat;
41 unsigned long mmu_context_cache_dat[NR_CPUS];
43 static unsigned long hole_pages;
48 void __init paging_init(void);
49 void __init mem_init(void);
50 void free_initmem(void);
51 #ifdef CONFIG_BLK_DEV_INITRD
52 void free_initrd_mem(unsigned long, unsigned long);
55 /* It'd be good if these lines were in the standard header file. */
56 #define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
57 #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
59 #ifndef CONFIG_DISCONTIGMEM
60 unsigned long __init zone_sizes_init(void)
62 unsigned long zones_size[MAX_NR_ZONES] = {0, };
63 unsigned long max_dma;
65 unsigned long start_pfn;
68 start_pfn = START_PFN(0);
69 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
73 zones_size[ZONE_DMA] = low - start_pfn;
74 zones_size[ZONE_NORMAL] = 0;
76 zones_size[ZONE_DMA] = low - start_pfn;
77 zones_size[ZONE_NORMAL] = low - max_dma;
80 zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
81 zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
82 start_pfn = __MEMORY_START >> PAGE_SHIFT;
83 #endif /* CONFIG_MMU */
85 free_area_init_node(0, zones_size, start_pfn, 0);
89 #else /* CONFIG_DISCONTIGMEM */
90 extern unsigned long zone_sizes_init(void);
91 #endif /* CONFIG_DISCONTIGMEM */
93 /*======================================================================*
94 * paging_init() : sets up the page tables
95 *======================================================================*/
96 void __init paging_init(void)
102 /* We don't need kernel mapping as hardware support that. */
103 pg_dir = swapper_pg_dir;
105 for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
106 pgd_val(pg_dir[i]) = 0;
107 #endif /* CONFIG_MMU */
108 hole_pages = zone_sizes_init();
111 int __init reservedpages_count(void)
113 int reservedpages, nid, i;
116 for_each_online_node(nid) {
118 pgdat_resize_lock(NODE_DATA(nid), &flags);
119 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
120 if (PageReserved(nid_page_nr(nid, i)))
122 pgdat_resize_unlock(NODE_DATA(nid), &flags);
125 return reservedpages;
128 /*======================================================================*
130 * orig : arch/sh/mm/init.c
131 *======================================================================*/
132 void __init mem_init(void)
134 int codesize, reservedpages, datasize, initsize;
137 extern unsigned long memory_end;
141 for_each_online_node(nid)
142 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
144 num_physpages -= hole_pages;
146 #ifndef CONFIG_DISCONTIGMEM
147 max_mapnr = num_physpages;
148 #endif /* CONFIG_DISCONTIGMEM */
151 high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
153 high_memory = (void *)(memory_end & PAGE_MASK);
154 #endif /* CONFIG_MMU */
156 /* clear the zero-page */
157 memset(empty_zero_page, 0, PAGE_SIZE);
159 /* this will put all low memory onto the freelists */
160 for_each_online_node(nid)
161 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
163 reservedpages = reservedpages_count() - hole_pages;
164 codesize = (unsigned long) &_etext - (unsigned long)&_text;
165 datasize = (unsigned long) &_edata - (unsigned long)&_etext;
166 initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
168 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
169 "%dk reserved, %dk data, %dk init)\n",
170 nr_free_pages() << (PAGE_SHIFT-10),
171 num_physpages << (PAGE_SHIFT-10),
173 reservedpages << (PAGE_SHIFT-10),
178 /*======================================================================*
180 * orig : arch/sh/mm/init.c
181 *======================================================================*/
182 void free_initmem(void)
184 free_initmem_default(0);
187 #ifdef CONFIG_BLK_DEV_INITRD
188 /*======================================================================*
189 * free_initrd_mem() :
190 * orig : arch/sh/mm/init.c
191 *======================================================================*/
192 void free_initrd_mem(unsigned long start, unsigned long end)
194 free_reserved_area(start, end, 0, "initrd");