cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

init.c (3214B)

      1/*
      2 * Copyright (C) 2013 Altera Corporation
      3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
      4 * Copyright (C) 2009 Wind River Systems Inc
      5 *   Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
      6 * Copyright (C) 2004 Microtronix Datacom Ltd
      7 *
      8 * based on arch/m68k/mm/init.c
      9 *
     10 * This file is subject to the terms and conditions of the GNU General Public
     11 * License. See the file "COPYING" in the main directory of this archive
     12 * for more details.
     13 */
     14
     15#include <linux/signal.h>
     16#include <linux/sched.h>
     17#include <linux/kernel.h>
     18#include <linux/errno.h>
     19#include <linux/string.h>
     20#include <linux/types.h>
     21#include <linux/ptrace.h>
     22#include <linux/mman.h>
     23#include <linux/mm.h>
     24#include <linux/init.h>
     25#include <linux/pagemap.h>
     26#include <linux/memblock.h>
     27#include <linux/slab.h>
     28#include <linux/binfmts.h>
     29
     30#include <asm/setup.h>
     31#include <asm/page.h>
     32#include <asm/sections.h>
     33#include <asm/tlb.h>
     34#include <asm/mmu_context.h>
     35#include <asm/cpuinfo.h>
     36#include <asm/processor.h>
     37
     38pgd_t *pgd_current;
     39
     40/*
     41 * paging_init() continues the virtual memory environment setup which
     42 * was begun by the code in arch/head.S.
     43 * The parameters are pointers to where to stick the starting and ending
     44 * addresses of available kernel virtual memory.
     45 */
     46void __init paging_init(void)
     47{
     48	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
     49
     50	pagetable_init();
     51	pgd_current = swapper_pg_dir;
     52
     53	max_zone_pfn[ZONE_NORMAL] = max_mapnr;
     54
     55	/* pass the memory from the bootmem allocator to the main allocator */
     56	free_area_init(max_zone_pfn);
     57
     58	flush_dcache_range((unsigned long)empty_zero_page,
     59			(unsigned long)empty_zero_page + PAGE_SIZE);
     60}
     61
     62void __init mem_init(void)
     63{
     64	unsigned long end_mem   = memory_end; /* this must not include
     65						kernel stack at top */
     66
     67	pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
     68
     69	end_mem &= PAGE_MASK;
     70	high_memory = __va(end_mem);
     71
     72	/* this will put all memory onto the freelists */
     73	memblock_free_all();
     74}
     75
     76void __init mmu_init(void)
     77{
     78	flush_tlb_all();
     79}
     80
     81#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
     82pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
     83pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
     84static struct page *kuser_page[1];
     85
     86static int alloc_kuser_page(void)
     87{
     88	extern char __kuser_helper_start[], __kuser_helper_end[];
     89	int kuser_sz = __kuser_helper_end - __kuser_helper_start;
     90	unsigned long vpage;
     91
     92	vpage = get_zeroed_page(GFP_ATOMIC);
     93	if (!vpage)
     94		return -ENOMEM;
     95
     96	/* Copy kuser helpers */
     97	memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
     98
     99	flush_icache_range(vpage, vpage + KUSER_SIZE);
    100	kuser_page[0] = virt_to_page(vpage);
    101
    102	return 0;
    103}
    104arch_initcall(alloc_kuser_page);
    105
    106int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
    107{
    108	struct mm_struct *mm = current->mm;
    109	int ret;
    110
    111	mmap_write_lock(mm);
    112
    113	/* Map kuser helpers to user space address */
    114	ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
    115				      VM_READ | VM_EXEC | VM_MAYREAD |
    116				      VM_MAYEXEC, kuser_page);
    117
    118	mmap_write_unlock(mm);
    119
    120	return ret;
    121}
    122
    123const char *arch_vma_name(struct vm_area_struct *vma)
    124{
    125	return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
    126}