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#include <asm/sections.h>
32
33pgd_t swapper_pg_dir[1024];
34
35/*
36 * Cache of MMU context last used.
37 */
38#ifndef CONFIG_SMP
39unsigned long mmu_context_cache_dat;
40#else
41unsigned long mmu_context_cache_dat[NR_CPUS];
42#endif
43
44/*
45 * function prototype
46 */
47void __init paging_init(void);
48void __init mem_init(void);
49void free_initmem(void);
50#ifdef CONFIG_BLK_DEV_INITRD
51void free_initrd_mem(unsigned long, unsigned long);
52#endif
53
54/* It'd be good if these lines were in the standard header file. */
55#define START_PFN(nid)		(NODE_DATA(nid)->bdata->node_min_pfn)
56#define MAX_LOW_PFN(nid)	(NODE_DATA(nid)->bdata->node_low_pfn)
57
58#ifndef CONFIG_DISCONTIGMEM
59void __init zone_sizes_init(void)
60{
61	unsigned long  zones_size[MAX_NR_ZONES] = {0, };
62	unsigned long  max_dma;
63	unsigned long  low;
64	unsigned long  start_pfn;
65
66#ifdef CONFIG_MMU
67	start_pfn = START_PFN(0);
68	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
69	low = MAX_LOW_PFN(0);
70
71	if (low < max_dma){
72		zones_size[ZONE_DMA] = low - start_pfn;
73		zones_size[ZONE_NORMAL] = 0;
74	} else {
75		zones_size[ZONE_DMA] = low - start_pfn;
76		zones_size[ZONE_NORMAL] = low - max_dma;
77	}
78#else
79	zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
80	zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
81	start_pfn = __MEMORY_START >> PAGE_SHIFT;
82#endif /* CONFIG_MMU */
83
84	free_area_init_node(0, zones_size, start_pfn, 0);
85}
86#else	/* CONFIG_DISCONTIGMEM */
87extern void zone_sizes_init(void);
88#endif	/* CONFIG_DISCONTIGMEM */
89
90/*======================================================================*
91 * paging_init() : sets up the page tables
92 *======================================================================*/
93void __init paging_init(void)
94{
95#ifdef CONFIG_MMU
96	int  i;
97	pgd_t *pg_dir;
98
99	/* We don't need kernel mapping as hardware support that. */
100	pg_dir = swapper_pg_dir;
101
102	for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
103		pgd_val(pg_dir[i]) = 0;
104#endif /* CONFIG_MMU */
105	zone_sizes_init();
106}
107
108/*======================================================================*
109 * mem_init() :
110 * orig : arch/sh/mm/init.c
111 *======================================================================*/
112void __init mem_init(void)
113{
114#ifndef CONFIG_MMU
115	extern unsigned long memory_end;
116
117	high_memory = (void *)(memory_end & PAGE_MASK);
118#else
119	high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
120#endif /* CONFIG_MMU */
121
122	/* clear the zero-page */
123	memset(empty_zero_page, 0, PAGE_SIZE);
124
125	set_max_mapnr(get_num_physpages());
126	free_all_bootmem();
127	mem_init_print_info(NULL);
128}
129
130/*======================================================================*
131 * free_initmem() :
132 * orig : arch/sh/mm/init.c
133 *======================================================================*/
134void free_initmem(void)
135{
136	free_initmem_default(-1);
137}
138
139#ifdef CONFIG_BLK_DEV_INITRD
140/*======================================================================*
141 * free_initrd_mem() :
142 * orig : arch/sh/mm/init.c
143 *======================================================================*/
144void free_initrd_mem(unsigned long start, unsigned long end)
145{
146	free_reserved_area((void *)start, (void *)end, -1, "initrd");
147}
148#endif
149