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  start_pfn;
 63
 64#ifdef CONFIG_MMU
 65	{
 66		unsigned long  low;
 67		unsigned long  max_dma;
 68
 69		start_pfn = START_PFN(0);
 70		max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 71		low = MAX_LOW_PFN(0);
 72
 73		if (low < max_dma) {
 74			zones_size[ZONE_DMA] = low - start_pfn;
 75			zones_size[ZONE_NORMAL] = 0;
 76		} else {
 77			zones_size[ZONE_DMA] = low - start_pfn;
 78			zones_size[ZONE_NORMAL] = low - max_dma;
 79		}
 80	}
 81#else
 82	zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
 83	zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
 84	start_pfn = __MEMORY_START >> PAGE_SHIFT;
 85#endif /* CONFIG_MMU */
 86
 87	free_area_init_node(0, zones_size, start_pfn, 0);
 88}
 89#else	/* CONFIG_DISCONTIGMEM */
 90extern void zone_sizes_init(void);
 91#endif	/* CONFIG_DISCONTIGMEM */
 92
 93/*======================================================================*
 94 * paging_init() : sets up the page tables
 95 *======================================================================*/
 96void __init paging_init(void)
 97{
 98#ifdef CONFIG_MMU
 99	int  i;
100	pgd_t *pg_dir;
101
102	/* We don't need kernel mapping as hardware support that. */
103	pg_dir = swapper_pg_dir;
104
105	for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
106		pgd_val(pg_dir[i]) = 0;
107#endif /* CONFIG_MMU */
108	zone_sizes_init();
109}
110
111/*======================================================================*
112 * mem_init() :
113 * orig : arch/sh/mm/init.c
114 *======================================================================*/
115void __init mem_init(void)
116{
117#ifndef CONFIG_MMU
118	extern unsigned long memory_end;
119
120	high_memory = (void *)(memory_end & PAGE_MASK);
121#else
122	high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
123#endif /* CONFIG_MMU */
124
125	/* clear the zero-page */
126	memset(empty_zero_page, 0, PAGE_SIZE);
127
128	set_max_mapnr(get_num_physpages());
129	free_all_bootmem();
130	mem_init_print_info(NULL);
131}
132
133/*======================================================================*
134 * free_initmem() :
135 * orig : arch/sh/mm/init.c
136 *======================================================================*/
137void free_initmem(void)
138{
139	free_initmem_default(-1);
140}
141
142#ifdef CONFIG_BLK_DEV_INITRD
143/*======================================================================*
144 * free_initrd_mem() :
145 * orig : arch/sh/mm/init.c
146 *======================================================================*/
147void free_initrd_mem(unsigned long start, unsigned long end)
148{
149	free_reserved_area((void *)start, (void *)end, -1, "initrd");
150}
151#endif