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