cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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init.c (2946B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  linux/arch/m68k/mm/init.c
      4 *
      5 *  Copyright (C) 1995  Hamish Macdonald
      6 *
      7 *  Contains common initialization routines, specific init code moved
      8 *  to motorola.c and sun3mmu.c
      9 */
     10
     11#include <linux/module.h>
     12#include <linux/signal.h>
     13#include <linux/sched.h>
     14#include <linux/mm.h>
     15#include <linux/swap.h>
     16#include <linux/kernel.h>
     17#include <linux/string.h>
     18#include <linux/types.h>
     19#include <linux/init.h>
     20#include <linux/memblock.h>
     21#include <linux/gfp.h>
     22
     23#include <asm/setup.h>
     24#include <linux/uaccess.h>
     25#include <asm/page.h>
     26#include <asm/pgalloc.h>
     27#include <asm/traps.h>
     28#include <asm/machdep.h>
     29#include <asm/io.h>
     30#ifdef CONFIG_ATARI
     31#include <asm/atari_stram.h>
     32#endif
     33#include <asm/sections.h>
     34#include <asm/tlb.h>
     35
     36/*
     37 * ZERO_PAGE is a special page that is used for zero-initialized
     38 * data and COW.
     39 */
     40void *empty_zero_page;
     41EXPORT_SYMBOL(empty_zero_page);
     42
     43#ifdef CONFIG_MMU
     44
     45int m68k_virt_to_node_shift;
     46
     47void __init m68k_setup_node(int node)
     48{
     49	node_set_online(node);
     50}
     51
     52#else /* CONFIG_MMU */
     53
     54/*
     55 * paging_init() continues the virtual memory environment setup which
     56 * was begun by the code in arch/head.S.
     57 * The parameters are pointers to where to stick the starting and ending
     58 * addresses of available kernel virtual memory.
     59 */
     60void __init paging_init(void)
     61{
     62	/*
     63	 * Make sure start_mem is page aligned, otherwise bootmem and
     64	 * page_alloc get different views of the world.
     65	 */
     66	unsigned long end_mem = memory_end & PAGE_MASK;
     67	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
     68
     69	high_memory = (void *) end_mem;
     70
     71	empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
     72	if (!empty_zero_page)
     73		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
     74		      __func__, PAGE_SIZE, PAGE_SIZE);
     75	max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT;
     76	free_area_init(max_zone_pfn);
     77}
     78
     79#endif /* CONFIG_MMU */
     80
     81void free_initmem(void)
     82{
     83#ifndef CONFIG_MMU_SUN3
     84	free_initmem_default(-1);
     85#endif /* CONFIG_MMU_SUN3 */
     86}
     87
     88#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
     89#define VECTORS	&vectors[0]
     90#else
     91#define VECTORS	_ramvec
     92#endif
     93
     94static inline void init_pointer_tables(void)
     95{
     96#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
     97	int i, j;
     98
     99	/* insert pointer tables allocated so far into the tablelist */
    100	init_pointer_table(kernel_pg_dir, TABLE_PGD);
    101	for (i = 0; i < PTRS_PER_PGD; i++) {
    102		pud_t *pud = (pud_t *)&kernel_pg_dir[i];
    103		pmd_t *pmd_dir;
    104
    105		if (!pud_present(*pud))
    106			continue;
    107
    108		pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
    109		init_pointer_table(pmd_dir, TABLE_PMD);
    110
    111		for (j = 0; j < PTRS_PER_PMD; j++) {
    112			pmd_t *pmd = &pmd_dir[j];
    113			pte_t *pte_dir;
    114
    115			if (!pmd_present(*pmd))
    116				continue;
    117
    118			pte_dir = (pte_t *)pmd_page_vaddr(*pmd);
    119			init_pointer_table(pte_dir, TABLE_PTE);
    120		}
    121	}
    122#endif
    123}
    124
    125void __init mem_init(void)
    126{
    127	/* this will put all memory onto the freelists */
    128	memblock_free_all();
    129	init_pointer_tables();
    130}