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)33void __init paging_init(void) 34 { 35 struct pglist_data *pgdat = NODE_DATA(0); 36 unsigned long zones_size[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 zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT; 53 pgdat->node_zones[ZONE_NORMAL].zone_start_pfn = 54 __pa(PAGE_OFFSET) >> PAGE_SHIFT; 55 56 free_area_init(zones_size); 57 } 58 mem_init(void)59void __init mem_init(void) 60 { 61 high_memory = (void *)(memory_end & PAGE_MASK); 62 63 /* this will put all memory onto the freelists */ 64 memblock_free_all(); 65 66 mem_init_print_info(NULL); 67 } 68