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  */
24 unsigned long empty_zero_page;
25 EXPORT_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  */
paging_init(void)33 void __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 
mem_init(void)57 void __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 }
66