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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
bbeb79ac YS |
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> | |
57c8a661 | 33 | #include <linux/memblock.h> |
bbeb79ac YS |
34 | #include <linux/gfp.h> |
35 | ||
36 | #include <asm/setup.h> | |
37 | #include <asm/segment.h> | |
38 | #include <asm/page.h> | |
bbeb79ac YS |
39 | #include <asm/sections.h> |
40 | ||
41 | /* | |
bbeb79ac YS |
42 | * ZERO_PAGE is a special page that is used for zero-initialized |
43 | * data and COW. | |
44 | */ | |
bbeb79ac YS |
45 | unsigned long empty_zero_page; |
46 | ||
47 | /* | |
48 | * paging_init() continues the virtual memory environment setup which | |
49 | * was begun by the code in arch/head.S. | |
50 | * The parameters are pointers to where to stick the starting and ending | |
51 | * addresses of available kernel virtual memory. | |
52 | */ | |
53 | void __init paging_init(void) | |
54 | { | |
55 | /* | |
56 | * Make sure start_mem is page aligned, otherwise bootmem and | |
57 | * page_alloc get different views og the world. | |
58 | */ | |
59 | unsigned long start_mem = PAGE_ALIGN(memory_start); | |
60 | unsigned long end_mem = memory_end & PAGE_MASK; | |
61 | ||
62 | pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n", | |
63 | start_mem, end_mem); | |
64 | ||
65 | /* | |
66 | * Initialize the bad page table and bad page to point | |
67 | * to a couple of allocated pages. | |
68 | */ | |
15c3c114 | 69 | empty_zero_page = (unsigned long)memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
8a7f97b9 MR |
70 | if (!empty_zero_page) |
71 | panic("%s: Failed to allocate %lu bytes align=0x%lx\n", | |
72 | __func__, PAGE_SIZE, PAGE_SIZE); | |
bbeb79ac YS |
73 | |
74 | /* | |
75 | * Set up SFC/DFC registers (user data space). | |
76 | */ | |
77 | set_fs(USER_DS); | |
78 | ||
79 | pr_debug("before free_area_init\n"); | |
80 | ||
81 | pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", | |
82 | start_mem, end_mem); | |
83 | ||
84 | { | |
fa3354e4 | 85 | unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, }; |
bbeb79ac | 86 | |
fa3354e4 MR |
87 | max_zone_pfn[ZONE_NORMAL] = end_mem >> PAGE_SHIFT; |
88 | free_area_init(max_zone_pfn); | |
bbeb79ac YS |
89 | } |
90 | } | |
91 | ||
92 | void __init mem_init(void) | |
93 | { | |
94 | pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end); | |
95 | ||
96 | high_memory = (void *) (memory_end & PAGE_MASK); | |
97 | max_mapnr = MAP_NR(high_memory); | |
98 | ||
99 | /* this will put all low memory onto the freelists */ | |
c6ffc5ca | 100 | memblock_free_all(); |
bbeb79ac | 101 | } |