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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
45int m68k_virt_to_node_shift;
46
47void __init m68k_setup_node(int node)
48{
49 node_set_online(node);
50}
51
52#else /* CONFIG_MMU */
53
54/*
55 * paging_init() continues the virtual memory environment setup which
56 * was begun by the code in arch/head.S.
57 * The parameters are pointers to where to stick the starting and ending
58 * addresses of available kernel virtual memory.
59 */
60void __init paging_init(void)
61{
62 /*
63 * Make sure start_mem is page aligned, otherwise bootmem and
64 * page_alloc get different views of the world.
65 */
66 unsigned long end_mem = memory_end & PAGE_MASK;
67 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
68
69 high_memory = (void *) end_mem;
70
71 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
72 if (!empty_zero_page)
73 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
74 __func__, PAGE_SIZE, PAGE_SIZE);
75 max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT;
76 free_area_init(max_zone_pfn);
77}
78
79#endif /* CONFIG_MMU */
80
81void free_initmem(void)
82{
83#ifndef CONFIG_MMU_SUN3
84 free_initmem_default(-1);
85#endif /* CONFIG_MMU_SUN3 */
86}
87
88#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
89#define VECTORS &vectors[0]
90#else
91#define VECTORS _ramvec
92#endif
93
94static inline void init_pointer_tables(void)
95{
96#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
97 int i, j;
98
99 /* insert pointer tables allocated so far into the tablelist */
100 init_pointer_table(kernel_pg_dir, TABLE_PGD);
101 for (i = 0; i < PTRS_PER_PGD; i++) {
102 pud_t *pud = (pud_t *)&kernel_pg_dir[i];
103 pmd_t *pmd_dir;
104
105 if (!pud_present(*pud))
106 continue;
107
108 pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
109 init_pointer_table(pmd_dir, TABLE_PMD);
110
111 for (j = 0; j < PTRS_PER_PMD; j++) {
112 pmd_t *pmd = &pmd_dir[j];
113 pte_t *pte_dir;
114
115 if (!pmd_present(*pmd))
116 continue;
117
118 pte_dir = (pte_t *)pmd_page_vaddr(*pmd);
119 init_pointer_table(pte_dir, TABLE_PTE);
120 }
121 }
122#endif
123}
124
125void __init mem_init(void)
126{
127 /* this will put all memory onto the freelists */
128 memblock_free_all();
129 init_pointer_tables();
130}
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 */
39void *empty_zero_page;
40EXPORT_SYMBOL(empty_zero_page);
41
42#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
43extern void init_pointer_table(unsigned long ptable);
44extern pmd_t *zero_pgtable;
45#endif
46
47#ifdef CONFIG_MMU
48
49pg_data_t pg_data_map[MAX_NUMNODES];
50EXPORT_SYMBOL(pg_data_map);
51
52int m68k_virt_to_node_shift;
53
54#ifndef CONFIG_SINGLE_MEMORY_CHUNK
55pg_data_t *pg_data_table[65];
56EXPORT_SYMBOL(pg_data_table);
57#endif
58
59void __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 */
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 = alloc_bootmem_pages(PAGE_SIZE);
97 memset(empty_zero_page, 0, 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
123void __init print_memmap(void)
124{
125#define UL(x) ((unsigned long) (x))
126#define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
127#define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
128#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
129
130 pr_notice("Virtual kernel memory layout:\n"
131 " vector : 0x%08lx - 0x%08lx (%4ld KiB)\n"
132 " kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n"
133 " vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n"
134 " lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n"
135 " .init : 0x%p" " - 0x%p" " (%4d KiB)\n"
136 " .text : 0x%p" " - 0x%p" " (%4d KiB)\n"
137 " .data : 0x%p" " - 0x%p" " (%4d KiB)\n"
138 " .bss : 0x%p" " - 0x%p" " (%4d KiB)\n",
139 MLK(VECTORS, VECTORS + 256),
140 MLM(KMAP_START, KMAP_END),
141 MLM(VMALLOC_START, VMALLOC_END),
142 MLM(PAGE_OFFSET, (unsigned long)high_memory),
143 MLK_ROUNDUP(__init_begin, __init_end),
144 MLK_ROUNDUP(_stext, _etext),
145 MLK_ROUNDUP(_sdata, _edata),
146 MLK_ROUNDUP(__bss_start, __bss_stop));
147}
148
149static inline void init_pointer_tables(void)
150{
151#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
152 int i;
153
154 /* insert pointer tables allocated so far into the tablelist */
155 init_pointer_table((unsigned long)kernel_pg_dir);
156 for (i = 0; i < PTRS_PER_PGD; i++) {
157 if (pgd_present(kernel_pg_dir[i]))
158 init_pointer_table(__pgd_page(kernel_pg_dir[i]));
159 }
160
161 /* insert also pointer table that we used to unmap the zero page */
162 if (zero_pgtable)
163 init_pointer_table((unsigned long)zero_pgtable);
164#endif
165}
166
167void __init mem_init(void)
168{
169 /* this will put all memory onto the freelists */
170 free_all_bootmem();
171 init_pointer_tables();
172 mem_init_print_info(NULL);
173 print_memmap();
174}
175
176#ifdef CONFIG_BLK_DEV_INITRD
177void free_initrd_mem(unsigned long start, unsigned long end)
178{
179 free_reserved_area((void *)start, (void *)end, -1, "initrd");
180}
181#endif