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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/m68k/mm/init.c
4 *
5 * Copyright (C) 1995 Hamish Macdonald
6 *
7 * Contains common initialization routines, specific init code moved
8 * to motorola.c and sun3mmu.c
9 */
10
11#include <linux/module.h>
12#include <linux/signal.h>
13#include <linux/sched.h>
14#include <linux/mm.h>
15#include <linux/swap.h>
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/types.h>
19#include <linux/init.h>
20#include <linux/bootmem.h>
21#include <linux/gfp.h>
22
23#include <asm/setup.h>
24#include <linux/uaccess.h>
25#include <asm/page.h>
26#include <asm/pgalloc.h>
27#include <asm/traps.h>
28#include <asm/machdep.h>
29#include <asm/io.h>
30#ifdef CONFIG_ATARI
31#include <asm/atari_stram.h>
32#endif
33#include <asm/sections.h>
34#include <asm/tlb.h>
35
36/*
37 * ZERO_PAGE is a special page that is used for zero-initialized
38 * data and COW.
39 */
40void *empty_zero_page;
41EXPORT_SYMBOL(empty_zero_page);
42
43#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
44extern void init_pointer_table(unsigned long ptable);
45extern pmd_t *zero_pgtable;
46#endif
47
48#ifdef CONFIG_MMU
49
50pg_data_t pg_data_map[MAX_NUMNODES];
51EXPORT_SYMBOL(pg_data_map);
52
53int m68k_virt_to_node_shift;
54
55#ifndef CONFIG_SINGLE_MEMORY_CHUNK
56pg_data_t *pg_data_table[65];
57EXPORT_SYMBOL(pg_data_table);
58#endif
59
60void __init m68k_setup_node(int node)
61{
62#ifndef CONFIG_SINGLE_MEMORY_CHUNK
63 struct m68k_mem_info *info = m68k_memory + node;
64 int i, end;
65
66 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
67 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
68 for (; i <= end; i++) {
69 if (pg_data_table[i])
70 pr_warn("overlap at %u for chunk %u\n", i, node);
71 pg_data_table[i] = pg_data_map + node;
72 }
73#endif
74 pg_data_map[node].bdata = bootmem_node_data + node;
75 node_set_online(node);
76}
77
78#else /* CONFIG_MMU */
79
80/*
81 * paging_init() continues the virtual memory environment setup which
82 * was begun by the code in arch/head.S.
83 * The parameters are pointers to where to stick the starting and ending
84 * addresses of available kernel virtual memory.
85 */
86void __init paging_init(void)
87{
88 /*
89 * Make sure start_mem is page aligned, otherwise bootmem and
90 * page_alloc get different views of the world.
91 */
92 unsigned long end_mem = memory_end & PAGE_MASK;
93 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
94
95 high_memory = (void *) end_mem;
96
97 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
98
99 /*
100 * Set up SFC/DFC registers (user data space).
101 */
102 set_fs (USER_DS);
103
104 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
105 free_area_init(zones_size);
106}
107
108#endif /* CONFIG_MMU */
109
110void free_initmem(void)
111{
112#ifndef CONFIG_MMU_SUN3
113 free_initmem_default(-1);
114#endif /* CONFIG_MMU_SUN3 */
115}
116
117#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
118#define VECTORS &vectors[0]
119#else
120#define VECTORS _ramvec
121#endif
122
123static inline void init_pointer_tables(void)
124{
125#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
126 int i;
127
128 /* insert pointer tables allocated so far into the tablelist */
129 init_pointer_table((unsigned long)kernel_pg_dir);
130 for (i = 0; i < PTRS_PER_PGD; i++) {
131 if (pgd_present(kernel_pg_dir[i]))
132 init_pointer_table(__pgd_page(kernel_pg_dir[i]));
133 }
134
135 /* insert also pointer table that we used to unmap the zero page */
136 if (zero_pgtable)
137 init_pointer_table((unsigned long)zero_pgtable);
138#endif
139}
140
141void __init mem_init(void)
142{
143 /* this will put all memory onto the freelists */
144 free_all_bootmem();
145 init_pointer_tables();
146 mem_init_print_info(NULL);
147}
148
149#ifdef CONFIG_BLK_DEV_INITRD
150void free_initrd_mem(unsigned long start, unsigned long end)
151{
152 free_reserved_area((void *)start, (void *)end, -1, "initrd");
153}
154#endif