root/arch/c6x/mm/init.c

DEFINITIONS

1. paging_init
2. mem_init

   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  */
  33 void __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 
  59 void __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 }