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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/memblock.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#ifdef CONFIG_MMU
44
45pg_data_t pg_data_map[MAX_NUMNODES];
46EXPORT_SYMBOL(pg_data_map);
47
48int m68k_virt_to_node_shift;
49
50#ifndef CONFIG_SINGLE_MEMORY_CHUNK
51pg_data_t *pg_data_table[65];
52EXPORT_SYMBOL(pg_data_table);
53#endif
54
55void __init m68k_setup_node(int node)
56{
57#ifndef CONFIG_SINGLE_MEMORY_CHUNK
58 struct m68k_mem_info *info = m68k_memory + node;
59 int i, end;
60
61 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
62 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
63 for (; i <= end; i++) {
64 if (pg_data_table[i])
65 pr_warn("overlap at %u for chunk %u\n", i, node);
66 pg_data_table[i] = pg_data_map + node;
67 }
68#endif
69 node_set_online(node);
70}
71
72#else /* CONFIG_MMU */
73
74/*
75 * paging_init() continues the virtual memory environment setup which
76 * was begun by the code in arch/head.S.
77 * The parameters are pointers to where to stick the starting and ending
78 * addresses of available kernel virtual memory.
79 */
80void __init paging_init(void)
81{
82 /*
83 * Make sure start_mem is page aligned, otherwise bootmem and
84 * page_alloc get different views of the world.
85 */
86 unsigned long end_mem = memory_end & PAGE_MASK;
87 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
88
89 high_memory = (void *) end_mem;
90
91 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
92 if (!empty_zero_page)
93 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
94 __func__, PAGE_SIZE, PAGE_SIZE);
95
96 /*
97 * Set up SFC/DFC registers (user data space).
98 */
99 set_fs (USER_DS);
100
101 max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT;
102 free_area_init(max_zone_pfn);
103}
104
105#endif /* CONFIG_MMU */
106
107void free_initmem(void)
108{
109#ifndef CONFIG_MMU_SUN3
110 free_initmem_default(-1);
111#endif /* CONFIG_MMU_SUN3 */
112}
113
114#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
115#define VECTORS &vectors[0]
116#else
117#define VECTORS _ramvec
118#endif
119
120static inline void init_pointer_tables(void)
121{
122#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
123 int i, j;
124
125 /* insert pointer tables allocated so far into the tablelist */
126 init_pointer_table(kernel_pg_dir, TABLE_PGD);
127 for (i = 0; i < PTRS_PER_PGD; i++) {
128 pud_t *pud = (pud_t *)&kernel_pg_dir[i];
129 pmd_t *pmd_dir;
130
131 if (!pud_present(*pud))
132 continue;
133
134 pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
135 init_pointer_table(pmd_dir, TABLE_PMD);
136
137 for (j = 0; j < PTRS_PER_PMD; j++) {
138 pmd_t *pmd = &pmd_dir[j];
139 pte_t *pte_dir;
140
141 if (!pmd_present(*pmd))
142 continue;
143
144 pte_dir = (pte_t *)pmd_page_vaddr(*pmd);
145 init_pointer_table(pte_dir, TABLE_PTE);
146 }
147 }
148#endif
149}
150
151void __init mem_init(void)
152{
153 /* this will put all memory onto the freelists */
154 memblock_free_all();
155 init_pointer_tables();
156 mem_init_print_info(NULL);
157}
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/memblock.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 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 */
85void __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 = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
97 if (!empty_zero_page)
98 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
99 __func__, PAGE_SIZE, PAGE_SIZE);
100
101 /*
102 * Set up SFC/DFC registers (user data space).
103 */
104 set_fs (USER_DS);
105
106 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
107 free_area_init(zones_size);
108}
109
110#endif /* CONFIG_MMU */
111
112void free_initmem(void)
113{
114#ifndef CONFIG_MMU_SUN3
115 free_initmem_default(-1);
116#endif /* CONFIG_MMU_SUN3 */
117}
118
119#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
120#define VECTORS &vectors[0]
121#else
122#define VECTORS _ramvec
123#endif
124
125static inline void init_pointer_tables(void)
126{
127#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
128 int i;
129
130 /* insert pointer tables allocated so far into the tablelist */
131 init_pointer_table((unsigned long)kernel_pg_dir);
132 for (i = 0; i < PTRS_PER_PGD; i++) {
133 if (pgd_present(kernel_pg_dir[i]))
134 init_pointer_table(__pgd_page(kernel_pg_dir[i]));
135 }
136
137 /* insert also pointer table that we used to unmap the zero page */
138 if (zero_pgtable)
139 init_pointer_table((unsigned long)zero_pgtable);
140#endif
141}
142
143void __init mem_init(void)
144{
145 /* this will put all memory onto the freelists */
146 memblock_free_all();
147 init_pointer_tables();
148 mem_init_print_info(NULL);
149}