1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/h8300/mm/init.c
4 *
5 * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
6 * Kenneth Albanowski <kjahds@kjahds.com>,
7 * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
8 *
9 * Based on:
10 *
11 * linux/arch/m68knommu/mm/init.c
12 * linux/arch/m68k/mm/init.c
13 *
14 * Copyright (C) 1995 Hamish Macdonald
15 *
16 * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
17 * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
18 */
19
20 #include <linux/signal.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/string.h>
25 #include <linux/types.h>
26 #include <linux/ptrace.h>
27 #include <linux/mman.h>
28 #include <linux/mm.h>
29 #include <linux/swap.h>
30 #include <linux/init.h>
31 #include <linux/highmem.h>
32 #include <linux/pagemap.h>
33 #include <linux/bootmem.h>
34 #include <linux/gfp.h>
35
36 #include <asm/setup.h>
37 #include <asm/segment.h>
38 #include <asm/page.h>
39 #include <asm/pgtable.h>
40 #include <asm/sections.h>
41
42 /*
43 * ZERO_PAGE is a special page that is used for zero-initialized
44 * data and COW.
45 */
46 unsigned long empty_zero_page;
47
48 /*
49 * paging_init() continues the virtual memory environment setup which
50 * was begun by the code in arch/head.S.
51 * The parameters are pointers to where to stick the starting and ending
52 * addresses of available kernel virtual memory.
53 */
paging_init(void)54 void __init paging_init(void)
55 {
56 /*
57 * Make sure start_mem is page aligned, otherwise bootmem and
58 * page_alloc get different views og the world.
59 */
60 unsigned long start_mem = PAGE_ALIGN(memory_start);
61 unsigned long end_mem = memory_end & PAGE_MASK;
62
63 pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n",
64 start_mem, end_mem);
65
66 /*
67 * Initialize the bad page table and bad page to point
68 * to a couple of allocated pages.
69 */
70 empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
71 memset((void *)empty_zero_page, 0, PAGE_SIZE);
72
73 /*
74 * Set up SFC/DFC registers (user data space).
75 */
76 set_fs(USER_DS);
77
78 pr_debug("before free_area_init\n");
79
80 pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
81 start_mem, end_mem);
82
83 {
84 unsigned long zones_size[MAX_NR_ZONES] = {0, };
85
86 zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
87 free_area_init(zones_size);
88 }
89 }
90
mem_init(void)91 void __init mem_init(void)
92 {
93 pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
94
95 high_memory = (void *) (memory_end & PAGE_MASK);
96 max_mapnr = MAP_NR(high_memory);
97
98 /* this will put all low memory onto the freelists */
99 free_all_bootmem();
100
101 mem_init_print_info(NULL);
102 }
103
104
105 #ifdef CONFIG_BLK_DEV_INITRD
free_initrd_mem(unsigned long start,unsigned long end)106 void free_initrd_mem(unsigned long start, unsigned long end)
107 {
108 free_reserved_area((void *)start, (void *)end, -1, "initrd");
109 }
110 #endif
111
112 void
free_initmem(void)113 free_initmem(void)
114 {
115 free_initmem_default(-1);
116 }
117