1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Port on Texas Instruments TMS320C6x architecture 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated 6*4882a593Smuzhiyun * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com) 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun #include <linux/mm.h> 9*4882a593Smuzhiyun #include <linux/swap.h> 10*4882a593Smuzhiyun #include <linux/module.h> 11*4882a593Smuzhiyun #include <linux/memblock.h> 12*4882a593Smuzhiyun #ifdef CONFIG_BLK_DEV_RAM 13*4882a593Smuzhiyun #include <linux/blkdev.h> 14*4882a593Smuzhiyun #endif 15*4882a593Smuzhiyun #include <linux/initrd.h> 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #include <asm/sections.h> 18*4882a593Smuzhiyun #include <linux/uaccess.h> 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun /* 21*4882a593Smuzhiyun * ZERO_PAGE is a special page that is used for zero-initialized 22*4882a593Smuzhiyun * data and COW. 23*4882a593Smuzhiyun */ 24*4882a593Smuzhiyun unsigned long empty_zero_page; 25*4882a593Smuzhiyun EXPORT_SYMBOL(empty_zero_page); 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun /* 28*4882a593Smuzhiyun * paging_init() continues the virtual memory environment setup which 29*4882a593Smuzhiyun * was begun by the code in arch/head.S. 30*4882a593Smuzhiyun * The parameters are pointers to where to stick the starting and ending 31*4882a593Smuzhiyun * addresses of available kernel virtual memory. 32*4882a593Smuzhiyun */ paging_init(void)33*4882a593Smuzhiyunvoid __init paging_init(void) 34*4882a593Smuzhiyun { 35*4882a593Smuzhiyun struct pglist_data *pgdat = NODE_DATA(0); 36*4882a593Smuzhiyun unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, }; 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun empty_zero_page = (unsigned long) memblock_alloc(PAGE_SIZE, 39*4882a593Smuzhiyun PAGE_SIZE); 40*4882a593Smuzhiyun if (!empty_zero_page) 41*4882a593Smuzhiyun panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 42*4882a593Smuzhiyun __func__, PAGE_SIZE, PAGE_SIZE); 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun /* 45*4882a593Smuzhiyun * Set up user data space 46*4882a593Smuzhiyun */ 47*4882a593Smuzhiyun set_fs(KERNEL_DS); 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun /* 50*4882a593Smuzhiyun * Define zones 51*4882a593Smuzhiyun */ 52*4882a593Smuzhiyun max_zone_pfn[ZONE_NORMAL] = memory_end >> PAGE_SHIFT; 53*4882a593Smuzhiyun 54*4882a593Smuzhiyun free_area_init(max_zone_pfn); 55*4882a593Smuzhiyun } 56*4882a593Smuzhiyun mem_init(void)57*4882a593Smuzhiyunvoid __init mem_init(void) 58*4882a593Smuzhiyun { 59*4882a593Smuzhiyun high_memory = (void *)(memory_end & PAGE_MASK); 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun /* this will put all memory onto the freelists */ 62*4882a593Smuzhiyun memblock_free_all(); 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun mem_init_print_info(NULL); 65*4882a593Smuzhiyun } 66