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Linux/arch/mn10300/mm/init.c

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  1 /* MN10300 Memory management initialisation
  2  *
  3  * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
  4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  5  * Modified by David Howells (dhowells@redhat.com)
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public Licence
  9  * as published by the Free Software Foundation; either version
 10  * 2 of the Licence, or (at your option) any later version.
 11  */
 12 #include <linux/signal.h>
 13 #include <linux/sched.h>
 14 #include <linux/kernel.h>
 15 #include <linux/errno.h>
 16 #include <linux/string.h>
 17 #include <linux/types.h>
 18 #include <linux/ptrace.h>
 19 #include <linux/mman.h>
 20 #include <linux/fs.h>
 21 #include <linux/mm.h>
 22 #include <linux/swap.h>
 23 #include <linux/smp.h>
 24 #include <linux/init.h>
 25 #include <linux/initrd.h>
 26 #include <linux/highmem.h>
 27 #include <linux/pagemap.h>
 28 #include <linux/bootmem.h>
 29 #include <linux/gfp.h>
 30 
 31 #include <asm/processor.h>
 32 #include <asm/uaccess.h>
 33 #include <asm/pgtable.h>
 34 #include <asm/pgalloc.h>
 35 #include <asm/dma.h>
 36 #include <asm/tlb.h>
 37 #include <asm/sections.h>
 38 
 39 unsigned long highstart_pfn, highend_pfn;
 40 
 41 #ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
 42 static struct vm_struct user_iomap_vm;
 43 #endif
 44 
 45 /*
 46  * set up paging
 47  */
 48 void __init paging_init(void)
 49 {
 50         unsigned long zones_size[MAX_NR_ZONES] = {0,};
 51         pte_t *ppte;
 52         int loop;
 53 
 54         /* main kernel space -> RAM mapping is handled as 1:1 transparent by
 55          * the MMU */
 56         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 57         memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));
 58 
 59         /* load the VMALLOC area PTE table addresses into the kernel PGD */
 60         ppte = kernel_vmalloc_ptes;
 61         for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
 62              loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
 63              loop++
 64              ) {
 65                 set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
 66                 ppte += PAGE_SIZE / sizeof(pte_t);
 67         }
 68 
 69         /* declare the sizes of the RAM zones (only use the normal zone) */
 70         zones_size[ZONE_NORMAL] =
 71                 contig_page_data.bdata->node_low_pfn -
 72                 contig_page_data.bdata->node_min_pfn;
 73 
 74         /* pass the memory from the bootmem allocator to the main allocator */
 75         free_area_init(zones_size);
 76 
 77 #ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
 78         /* The Atomic Operation Unit registers need to be mapped to userspace
 79          * for all processes.  The following uses vm_area_register_early() to
 80          * reserve the first page of the vmalloc area and sets the pte for that
 81          * page.
 82          *
 83          * glibc hardcodes this virtual mapping, so we're pretty much stuck with
 84          * it from now on.
 85          */
 86         user_iomap_vm.flags = VM_USERMAP;
 87         user_iomap_vm.size = 1 << PAGE_SHIFT;
 88         vm_area_register_early(&user_iomap_vm, PAGE_SIZE);
 89         ppte = kernel_vmalloc_ptes;
 90         set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT,
 91                               PAGE_USERIO));
 92 #endif
 93 
 94         local_flush_tlb_all();
 95 }
 96 
 97 /*
 98  * transfer all the memory from the bootmem allocator to the runtime allocator
 99  */
100 void __init mem_init(void)
101 {
102         BUG_ON(!mem_map);
103 
104 #define START_PFN       (contig_page_data.bdata->node_min_pfn)
105 #define MAX_LOW_PFN     (contig_page_data.bdata->node_low_pfn)
106 
107         max_mapnr = MAX_LOW_PFN - START_PFN;
108         high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE);
109 
110         /* clear the zero-page */
111         memset(empty_zero_page, 0, PAGE_SIZE);
112 
113         /* this will put all low memory onto the freelists */
114         free_all_bootmem();
115 
116         mem_init_print_info(NULL);
117 }
118 
119 /*
120  * recycle memory containing stuff only required for initialisation
121  */
122 void free_initmem(void)
123 {
124         free_initmem_default(POISON_FREE_INITMEM);
125 }
126 
127 /*
128  * dispose of the memory on which the initial ramdisk resided
129  */
130 #ifdef CONFIG_BLK_DEV_INITRD
131 void free_initrd_mem(unsigned long start, unsigned long end)
132 {
133         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
134                            "initrd");
135 }
136 #endif
137 

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