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Linux/arch/m68k/mm/init.c

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  1 /*
  2  *  linux/arch/m68k/mm/init.c
  3  *
  4  *  Copyright (C) 1995  Hamish Macdonald
  5  *
  6  *  Contains common initialization routines, specific init code moved
  7  *  to motorola.c and sun3mmu.c
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/signal.h>
 12 #include <linux/sched.h>
 13 #include <linux/mm.h>
 14 #include <linux/swap.h>
 15 #include <linux/kernel.h>
 16 #include <linux/string.h>
 17 #include <linux/types.h>
 18 #include <linux/init.h>
 19 #include <linux/bootmem.h>
 20 #include <linux/gfp.h>
 21 
 22 #include <asm/setup.h>
 23 #include <asm/uaccess.h>
 24 #include <asm/page.h>
 25 #include <asm/pgalloc.h>
 26 #include <asm/traps.h>
 27 #include <asm/machdep.h>
 28 #include <asm/io.h>
 29 #ifdef CONFIG_ATARI
 30 #include <asm/atari_stram.h>
 31 #endif
 32 #include <asm/sections.h>
 33 #include <asm/tlb.h>
 34 
 35 /*
 36  * ZERO_PAGE is a special page that is used for zero-initialized
 37  * data and COW.
 38  */
 39 void *empty_zero_page;
 40 EXPORT_SYMBOL(empty_zero_page);
 41 
 42 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 43 extern void init_pointer_table(unsigned long ptable);
 44 extern pmd_t *zero_pgtable;
 45 #endif
 46 
 47 #ifdef CONFIG_MMU
 48 
 49 pg_data_t pg_data_map[MAX_NUMNODES];
 50 EXPORT_SYMBOL(pg_data_map);
 51 
 52 int m68k_virt_to_node_shift;
 53 
 54 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
 55 pg_data_t *pg_data_table[65];
 56 EXPORT_SYMBOL(pg_data_table);
 57 #endif
 58 
 59 void __init m68k_setup_node(int node)
 60 {
 61 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
 62         struct m68k_mem_info *info = m68k_memory + node;
 63         int i, end;
 64 
 65         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
 66         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
 67         for (; i <= end; i++) {
 68                 if (pg_data_table[i])
 69                         printk("overlap at %u for chunk %u\n", i, node);
 70                 pg_data_table[i] = pg_data_map + node;
 71         }
 72 #endif
 73         pg_data_map[node].bdata = bootmem_node_data + node;
 74         node_set_online(node);
 75 }
 76 
 77 #else /* CONFIG_MMU */
 78 
 79 /*
 80  * paging_init() continues the virtual memory environment setup which
 81  * was begun by the code in arch/head.S.
 82  * The parameters are pointers to where to stick the starting and ending
 83  * addresses of available kernel virtual memory.
 84  */
 85 void __init paging_init(void)
 86 {
 87         /*
 88          * Make sure start_mem is page aligned, otherwise bootmem and
 89          * page_alloc get different views of the world.
 90          */
 91         unsigned long end_mem = memory_end & PAGE_MASK;
 92         unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 93 
 94         high_memory = (void *) end_mem;
 95 
 96         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 97 
 98         /*
 99          * Set up SFC/DFC registers (user data space).
100          */
101         set_fs (USER_DS);
102 
103         zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
104         free_area_init(zones_size);
105 }
106 
107 #endif /* CONFIG_MMU */
108 
109 void free_initmem(void)
110 {
111 #ifndef CONFIG_MMU_SUN3
112         free_initmem_default(-1);
113 #endif /* CONFIG_MMU_SUN3 */
114 }
115 
116 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
117 #define VECTORS &vectors[0]
118 #else
119 #define VECTORS _ramvec
120 #endif
121 
122 void __init print_memmap(void)
123 {
124 #define UL(x) ((unsigned long) (x))
125 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
126 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
127 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
128 
129         pr_notice("Virtual kernel memory layout:\n"
130                 "    vector  : 0x%08lx - 0x%08lx   (%4ld KiB)\n"
131                 "    kmap    : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
132                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
133                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
134                 "      .init : 0x%p" " - 0x%p" "   (%4d KiB)\n"
135                 "      .text : 0x%p" " - 0x%p" "   (%4d KiB)\n"
136                 "      .data : 0x%p" " - 0x%p" "   (%4d KiB)\n"
137                 "      .bss  : 0x%p" " - 0x%p" "   (%4d KiB)\n",
138                 MLK(VECTORS, VECTORS + 256),
139                 MLM(KMAP_START, KMAP_END),
140                 MLM(VMALLOC_START, VMALLOC_END),
141                 MLM(PAGE_OFFSET, (unsigned long)high_memory),
142                 MLK_ROUNDUP(__init_begin, __init_end),
143                 MLK_ROUNDUP(_stext, _etext),
144                 MLK_ROUNDUP(_sdata, _edata),
145                 MLK_ROUNDUP(__bss_start, __bss_stop));
146 }
147 
148 static inline void init_pointer_tables(void)
149 {
150 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
151         int i;
152 
153         /* insert pointer tables allocated so far into the tablelist */
154         init_pointer_table((unsigned long)kernel_pg_dir);
155         for (i = 0; i < PTRS_PER_PGD; i++) {
156                 if (pgd_present(kernel_pg_dir[i]))
157                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
158         }
159 
160         /* insert also pointer table that we used to unmap the zero page */
161         if (zero_pgtable)
162                 init_pointer_table((unsigned long)zero_pgtable);
163 #endif
164 }
165 
166 void __init mem_init(void)
167 {
168         /* this will put all memory onto the freelists */
169         free_all_bootmem();
170         init_pointer_tables();
171         mem_init_print_info(NULL);
172         print_memmap();
173 }
174 
175 #ifdef CONFIG_BLK_DEV_INITRD
176 void free_initrd_mem(unsigned long start, unsigned long end)
177 {
178         free_reserved_area((void *)start, (void *)end, -1, "initrd");
179 }
180 #endif
181 

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