xref: /openbmc/linux/arch/riscv/mm/init.c (revision a34a3ed7)
1 /*
2  * Copyright (C) 2012 Regents of the University of California
3  *
4  *   This program is free software; you can redistribute it and/or
5  *   modify it under the terms of the GNU General Public License
6  *   as published by the Free Software Foundation, version 2.
7  *
8  *   This program is distributed in the hope that it will be useful,
9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  *   GNU General Public License for more details.
12  */
13 
14 #include <linux/init.h>
15 #include <linux/mm.h>
16 #include <linux/bootmem.h>
17 #include <linux/initrd.h>
18 #include <linux/memblock.h>
19 #include <linux/swap.h>
20 #include <linux/sizes.h>
21 
22 #include <asm/tlbflush.h>
23 #include <asm/sections.h>
24 #include <asm/pgtable.h>
25 #include <asm/io.h>
26 
27 static void __init zone_sizes_init(void)
28 {
29 	unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
30 
31 	max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, max_low_pfn));
32 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
33 
34 	free_area_init_nodes(max_zone_pfns);
35 }
36 
37 void setup_zero_page(void)
38 {
39 	memset((void *)empty_zero_page, 0, PAGE_SIZE);
40 }
41 
42 void __init paging_init(void)
43 {
44 	setup_zero_page();
45 	local_flush_tlb_all();
46 	zone_sizes_init();
47 }
48 
49 void __init mem_init(void)
50 {
51 #ifdef CONFIG_FLATMEM
52 	BUG_ON(!mem_map);
53 #endif /* CONFIG_FLATMEM */
54 
55 	high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
56 	free_all_bootmem();
57 
58 	mem_init_print_info(NULL);
59 }
60 
61 void free_initmem(void)
62 {
63 	free_initmem_default(0);
64 }
65 
66 #ifdef CONFIG_BLK_DEV_INITRD
67 void free_initrd_mem(unsigned long start, unsigned long end)
68 {
69 }
70 #endif /* CONFIG_BLK_DEV_INITRD */
71