aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mn10300/mm/init.c
blob: 97a1ec0beeecf2fd5dd538eda613b3bbcfa5346b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/* MN10300 Memory management initialisation
 *
 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Modified by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/gfp.h>

#include <asm/processor.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>
#include <asm/tlb.h>
#include <asm/sections.h>

unsigned long highstart_pfn, highend_pfn;

#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
static struct vm_struct user_iomap_vm;
#endif

/*
 * set up paging
 */
void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES] = {0,};
	pte_t *ppte;
	int loop;

	/* main kernel space -> RAM mapping is handled as 1:1 transparent by
	 * the MMU */
	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
	memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));

	/* load the VMALLOC area PTE table addresses into the kernel PGD */
	ppte = kernel_vmalloc_ptes;
	for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
	     loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
	     loop++
	     ) {
		set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
		ppte += PAGE_SIZE / sizeof(pte_t);
	}

	/* declare the sizes of the RAM zones (only use the normal zone) */
	zones_size[ZONE_NORMAL] =
		contig_page_data.bdata->node_low_pfn -
		contig_page_data.bdata->node_min_pfn;

	/* pass the memory from the bootmem allocator to the main allocator */
	free_area_init(zones_size);

#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
	/* The Atomic Operation Unit registers need to be mapped to userspace
	 * for all processes.  The following uses vm_area_register_early() to
	 * reserve the first page of the vmalloc area and sets the pte for that
	 * page.
	 *
	 * glibc hardcodes this virtual mapping, so we're pretty much stuck with
	 * it from now on.
	 */
	user_iomap_vm.flags = VM_USERMAP;
	user_iomap_vm.size = 1 << PAGE_SHIFT;
	vm_area_register_early(&user_iomap_vm, PAGE_SIZE);
	ppte = kernel_vmalloc_ptes;
	set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT,
			      PAGE_USERIO));
#endif

	local_flush_tlb_all();
}

/*
 * transfer all the memory from the bootmem allocator to the runtime allocator
 */
void __init mem_init(void)
{
	BUG_ON(!mem_map);

#define START_PFN	(contig_page_data.bdata->node_min_pfn)
#define MAX_LOW_PFN	(contig_page_data.bdata->node_low_pfn)

	max_mapnr = MAX_LOW_PFN - START_PFN;
	high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE);

	/* clear the zero-page */
	memset(empty_zero_page, 0, PAGE_SIZE);

	/* this will put all low memory onto the freelists */
	free_all_bootmem();

	mem_init_print_info(NULL);
}

/*
 * recycle memory containing stuff only required for initialisation
 */
void free_initmem(void)
{
	free_initmem_default(POISON_FREE_INITMEM);
}

/*
 * dispose of the memory on which the initial ramdisk resided
 */
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
			   "initrd");
}
#endif