1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *  Port on Texas Instruments TMS320C6x architecture
 4 *
 5 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
 6 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
 7 */
 8#include <linux/mm.h>
 9#include <linux/swap.h>
10#include <linux/module.h>
11#include <linux/memblock.h>
12#ifdef CONFIG_BLK_DEV_RAM
13#include <linux/blkdev.h>
14#endif
15#include <linux/initrd.h>
16
17#include <asm/sections.h>
18#include <linux/uaccess.h>
19
20/*
21 * ZERO_PAGE is a special page that is used for zero-initialized
22 * data and COW.
23 */
24unsigned long empty_zero_page;
25EXPORT_SYMBOL(empty_zero_page);
26
27/*
28 * paging_init() continues the virtual memory environment setup which
29 * was begun by the code in arch/head.S.
30 * The parameters are pointers to where to stick the starting and ending
31 * addresses  of available kernel virtual memory.
32 */
33void __init paging_init(void)
34{
35	struct pglist_data *pgdat = NODE_DATA(0);
36	unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
37
38	empty_zero_page      = (unsigned long) memblock_alloc(PAGE_SIZE,
39							      PAGE_SIZE);
40	if (!empty_zero_page)
41		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
42		      __func__, PAGE_SIZE, PAGE_SIZE);
43
44	/*
45	 * Set up user data space
46	 */
47	set_fs(KERNEL_DS);
48
49	/*
50	 * Define zones
51	 */
52	max_zone_pfn[ZONE_NORMAL] = memory_end >> PAGE_SHIFT;
53
54	free_area_init(max_zone_pfn);
55}
56
57void __init mem_init(void)
58{
59	high_memory = (void *)(memory_end & PAGE_MASK);
60
61	/* this will put all memory onto the freelists */
62	memblock_free_all();
63
64	mem_init_print_info(NULL);
65}