tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/arch/m32r/mm/init.c
3 *
4 * Copyright (c) 2001, 2002 Hitoshi Yamamoto
5 *
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
10 */
11
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/mm.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>
25#include <asm/page.h>
26#include <asm/pgtable.h>
27#include <asm/pgalloc.h>
28#include <asm/mmu_context.h>
29#include <asm/setup.h>
30#include <asm/tlb.h>
31
32/* References to section boundaries */
33extern char _text, _etext, _edata;
34extern char __init_begin, __init_end;
35
36pgd_t swapper_pg_dir[1024];
37
38/*
39 * Cache of MMU context last used.
40 */
41#ifndef CONFIG_SMP
42unsigned long mmu_context_cache_dat;
43#else
44unsigned long mmu_context_cache_dat[NR_CPUS];
45#endif
46static unsigned long hole_pages;
47
48/*
49 * function prototype
50 */
51void __init paging_init(void);
52void __init mem_init(void);
53void free_initmem(void);
54#ifdef CONFIG_BLK_DEV_INITRD
55void free_initrd_mem(unsigned long, unsigned long);
56#endif
57
58/* It'd be good if these lines were in the standard header file. */
59#define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
60#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
61
62#ifndef CONFIG_DISCONTIGMEM
63unsigned long __init zone_sizes_init(void)
64{
65 unsigned long zones_size[MAX_NR_ZONES] = {0, };
66 unsigned long max_dma;
67 unsigned long low;
68 unsigned long start_pfn;
69
70#ifdef CONFIG_MMU
71 start_pfn = START_PFN(0);
72 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
73 low = MAX_LOW_PFN(0);
74
75 if (low < max_dma){
76 zones_size[ZONE_DMA] = low - start_pfn;
77 zones_size[ZONE_NORMAL] = 0;
78 } else {
79 zones_size[ZONE_DMA] = low - start_pfn;
80 zones_size[ZONE_NORMAL] = low - max_dma;
81 }
82#else
83 zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
84 zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
85 start_pfn = __MEMORY_START >> PAGE_SHIFT;
86#endif /* CONFIG_MMU */
87
88 free_area_init_node(0, zones_size, start_pfn, 0);
89
90 return 0;
91}
92#else /* CONFIG_DISCONTIGMEM */
93extern unsigned long zone_sizes_init(void);
94#endif /* CONFIG_DISCONTIGMEM */
95
96/*======================================================================*
97 * paging_init() : sets up the page tables
98 *======================================================================*/
99void __init paging_init(void)
100{
101#ifdef CONFIG_MMU
102 int i;
103 pgd_t *pg_dir;
104
105 /* We don't need kernel mapping as hardware support that. */
106 pg_dir = swapper_pg_dir;
107
108 for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
109 pgd_val(pg_dir[i]) = 0;
110#endif /* CONFIG_MMU */
111 hole_pages = zone_sizes_init();
112}
113
114int __init reservedpages_count(void)
115{
116 int reservedpages, nid, i;
117
118 reservedpages = 0;
119 for_each_online_node(nid) {
120 unsigned long flags;
121 pgdat_resize_lock(NODE_DATA(nid), &flags);
122 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
123 if (PageReserved(nid_page_nr(nid, i)))
124 reservedpages++;
125 pgdat_resize_unlock(NODE_DATA(nid), &flags);
126 }
127
128 return reservedpages;
129}
130
131/*======================================================================*
132 * mem_init() :
133 * orig : arch/sh/mm/init.c
134 *======================================================================*/
135void __init mem_init(void)
136{
137 int codesize, reservedpages, datasize, initsize;
138 int nid;
139#ifndef CONFIG_MMU
140 extern unsigned long memory_end;
141#endif
142
143 num_physpages = 0;
144 for_each_online_node(nid)
145 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
146
147 num_physpages -= hole_pages;
148
149#ifndef CONFIG_DISCONTIGMEM
150 max_mapnr = num_physpages;
151#endif /* CONFIG_DISCONTIGMEM */
152
153#ifdef CONFIG_MMU
154 high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
155#else
156 high_memory = (void *)(memory_end & PAGE_MASK);
157#endif /* CONFIG_MMU */
158
159 /* clear the zero-page */
160 memset(empty_zero_page, 0, PAGE_SIZE);
161
162 /* this will put all low memory onto the freelists */
163 for_each_online_node(nid)
164 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
165
166 reservedpages = reservedpages_count() - hole_pages;
167 codesize = (unsigned long) &_etext - (unsigned long)&_text;
168 datasize = (unsigned long) &_edata - (unsigned long)&_etext;
169 initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
170
171 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
172 "%dk reserved, %dk data, %dk init)\n",
173 nr_free_pages() << (PAGE_SHIFT-10),
174 num_physpages << (PAGE_SHIFT-10),
175 codesize >> 10,
176 reservedpages << (PAGE_SHIFT-10),
177 datasize >> 10,
178 initsize >> 10);
179}
180
181/*======================================================================*
182 * free_initmem() :
183 * orig : arch/sh/mm/init.c
184 *======================================================================*/
185void free_initmem(void)
186{
187 unsigned long addr;
188
189 addr = (unsigned long)(&__init_begin);
190 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
191 ClearPageReserved(virt_to_page(addr));
192 init_page_count(virt_to_page(addr));
193 free_page(addr);
194 totalram_pages++;
195 }
196 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
197 (int)(&__init_end - &__init_begin) >> 10);
198}
199
200#ifdef CONFIG_BLK_DEV_INITRD
201/*======================================================================*
202 * free_initrd_mem() :
203 * orig : arch/sh/mm/init.c
204 *======================================================================*/
205void free_initrd_mem(unsigned long start, unsigned long end)
206{
207 unsigned long p;
208 for (p = start; p < end; p += PAGE_SIZE) {
209 ClearPageReserved(virt_to_page(p));
210 init_page_count(virt_to_page(p));
211 free_page(p);
212 totalram_pages++;
213 }
214 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
215}
216#endif