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 <asm/types.h>
22 #include <asm/processor.h>
24 #include <asm/pgtable.h>
25 #include <asm/pgalloc.h>
26 #include <asm/mmu_context.h>
27 #include <asm/setup.h>
30 /* References to section boundaries */
31 extern char _text, _etext, _edata;
32 extern char __init_begin, __init_end;
34 pgd_t swapper_pg_dir[1024];
36 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
40 int total = 0, reserved = 0;
41 int shared = 0, cached = 0;
47 printk("Mem-info:\n");
49 printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
50 for_each_pgdat(pgdat) {
51 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
52 page = pgdat_page_nr(pgdat, i);
54 if (PageHighMem(page))
56 if (PageReserved(page))
58 else if (PageSwapCache(page))
60 else if (page_count(page))
61 shared += page_count(page) - 1;
64 printk("%d pages of RAM\n", total);
65 printk("%d pages of HIGHMEM\n",highmem);
66 printk("%d reserved pages\n",reserved);
67 printk("%d pages shared\n",shared);
68 printk("%d pages swap cached\n",cached);
72 * Cache of MMU context last used.
75 unsigned long mmu_context_cache_dat;
77 unsigned long mmu_context_cache_dat[NR_CPUS];
79 static unsigned long hole_pages;
84 void __init paging_init(void);
85 void __init mem_init(void);
86 void free_initmem(void);
87 #ifdef CONFIG_BLK_DEV_INITRD
88 void free_initrd_mem(unsigned long, unsigned long);
91 /* It'd be good if these lines were in the standard header file. */
92 #define START_PFN(nid) \
93 (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
94 #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
96 #ifndef CONFIG_DISCONTIGMEM
97 unsigned long __init zone_sizes_init(void)
99 unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
100 unsigned long max_dma;
102 unsigned long start_pfn;
105 start_pfn = START_PFN(0);
106 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
107 low = MAX_LOW_PFN(0);
110 zones_size[ZONE_DMA] = low - start_pfn;
111 zones_size[ZONE_NORMAL] = 0;
113 zones_size[ZONE_DMA] = low - start_pfn;
114 zones_size[ZONE_NORMAL] = low - max_dma;
117 zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
118 zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
119 start_pfn = __MEMORY_START >> PAGE_SHIFT;
120 #endif /* CONFIG_MMU */
122 free_area_init_node(0, NODE_DATA(0), zones_size, start_pfn, 0);
126 #else /* CONFIG_DISCONTIGMEM */
127 extern unsigned long zone_sizes_init(void);
128 #endif /* CONFIG_DISCONTIGMEM */
130 /*======================================================================*
131 * paging_init() : sets up the page tables
132 *======================================================================*/
133 void __init paging_init(void)
139 /* We don't need kernel mapping as hardware support that. */
140 pg_dir = swapper_pg_dir;
142 for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
143 pgd_val(pg_dir[i]) = 0;
144 #endif /* CONFIG_MMU */
145 hole_pages = zone_sizes_init();
148 int __init reservedpages_count(void)
150 int reservedpages, nid, i;
153 for_each_online_node(nid)
154 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
155 if (PageReserved(nid_page_nr(nid, i)))
158 return reservedpages;
161 /*======================================================================*
163 * orig : arch/sh/mm/init.c
164 *======================================================================*/
165 void __init mem_init(void)
167 int codesize, reservedpages, datasize, initsize;
170 extern unsigned long memory_end;
174 for_each_online_node(nid)
175 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
177 num_physpages -= hole_pages;
179 #ifndef CONFIG_DISCONTIGMEM
180 max_mapnr = num_physpages;
181 #endif /* CONFIG_DISCONTIGMEM */
184 high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
186 high_memory = (void *)(memory_end & PAGE_MASK);
187 #endif /* CONFIG_MMU */
189 /* clear the zero-page */
190 memset(empty_zero_page, 0, PAGE_SIZE);
192 /* this will put all low memory onto the freelists */
193 for_each_online_node(nid)
194 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
196 reservedpages = reservedpages_count() - hole_pages;
197 codesize = (unsigned long) &_etext - (unsigned long)&_text;
198 datasize = (unsigned long) &_edata - (unsigned long)&_etext;
199 initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
201 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
202 "%dk reserved, %dk data, %dk init)\n",
203 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
204 num_physpages << (PAGE_SHIFT-10),
206 reservedpages << (PAGE_SHIFT-10),
211 /*======================================================================*
213 * orig : arch/sh/mm/init.c
214 *======================================================================*/
215 void free_initmem(void)
219 addr = (unsigned long)(&__init_begin);
220 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
221 ClearPageReserved(virt_to_page(addr));
222 set_page_count(virt_to_page(addr), 1);
226 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
227 (int)(&__init_end - &__init_begin) >> 10);
230 #ifdef CONFIG_BLK_DEV_INITRD
231 /*======================================================================*
232 * free_initrd_mem() :
233 * orig : arch/sh/mm/init.c
234 *======================================================================*/
235 void free_initrd_mem(unsigned long start, unsigned long end)
238 for (p = start; p < end; p += PAGE_SIZE) {
239 ClearPageReserved(virt_to_page(p));
240 set_page_count(virt_to_page(p), 1);
244 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);