arch/cris/mm/init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/cris/mm/init.c
   4  *
   5  *  Copyright (C) 1995  Linus Torvalds
   6  *  Copyright (C) 2000,2001  Axis Communications AB
   7  *
   8  *  Authors:  Bjorn Wesen (bjornw@axis.com)
   9  *
  10  */
  11
  12 #include <linux/gfp.h>
  13 #include <linux/init.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/kcore.h>
  17 #include <asm/tlb.h>
  18 #include <asm/sections.h>
  19
  20 unsigned long empty_zero_page;
  21 EXPORT_SYMBOL(empty_zero_page);
  22
  23 void __init mem_init(void)
  24 {
  25         BUG_ON(!mem_map);
  26
  27         /* max/min_low_pfn was set by setup.c
  28          * now we just copy it to some other necessary places...
  29          *
  30          * high_memory was also set in setup.c
  31          */
  32         max_mapnr = max_low_pfn - min_low_pfn;
  33         free_all_bootmem();
  34         mem_init_print_info(NULL);
  35 }
  36
  37 /* Free a range of init pages. Virtual addresses. */
  38
  39 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
  40 {
  41         unsigned long addr;
  42
  43         for (addr = begin; addr < end; addr += PAGE_SIZE) {
  44                 ClearPageReserved(virt_to_page(addr));
  45                 init_page_count(virt_to_page(addr));
  46                 free_page(addr);
  47                 totalram_pages++;
  48         }
  49
  50         printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
  51 }
  52
  53 /* Free the pages occupied by initialization code. */
  54
  55 void free_initmem(void)
  56 {
  57         free_initmem_default(-1);
  58 }
  59
  60 /* Free the pages occupied by initrd code. */
  61
  62 #ifdef CONFIG_BLK_DEV_INITRD
  63 void free_initrd_mem(unsigned long start, unsigned long end)
  64 {
  65         free_init_pages("initrd memory",
  66                         start,
  67                         end);
  68 }
  69 #endif