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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) */
#include <linux/stddef.h>#include <linux/module.h>#include <linux/memblock.h>#include <linux/mm.h>#include <linux/swap.h>#include <linux/slab.h>#include <linux/init.h>#include <asm/sections.h>#include <asm/page.h>#include <asm/pgalloc.h>#include <as-layout.h>#include <init.h>#include <kern.h>#include <kern_util.h>#include <mem_user.h>#include <os.h>#include <um_malloc.h>#include <linux/sched/task.h>#include <linux/kasan.h>
#ifdef CONFIG_KASANvoid __init kasan_init(void){ /* * kasan_map_memory will map all of the required address space and * the host machine will allocate physical memory as necessary. */ kasan_map_memory((void *)KASAN_SHADOW_START, KASAN_SHADOW_SIZE); init_task.kasan_depth = 0; /* * Since kasan_init() is called before main(), * KASAN is initialized but the enablement is deferred after * jump_label_init(). See arch_mm_preinit(). */}
static void (*kasan_init_ptr)(void)__section(".kasan_init") __used= kasan_init;#endif
/* * Initialized during boot, and readonly for initializing page tables * afterwards */pgd_t swapper_pg_dir[PTRS_PER_PGD];
/* Initialized at boot time, and readonly after that */int kmalloc_ok = 0;
/* Used during early boot */static unsigned long brk_end;
void __init arch_mm_preinit(void){ /* Safe to call after jump_label_init(). Enables KASAN. */ kasan_init_generic();
/* Map in the area just after the brk now that kmalloc is about * to be turned on. */ brk_end = PAGE_ALIGN((unsigned long) sbrk(0)); map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0); memblock_free((void *)brk_end, uml_reserved - brk_end); uml_reserved = brk_end; min_low_pfn = PFN_UP(__pa(uml_reserved)); max_pfn = max_low_pfn;}
void __init mem_init(void){ kmalloc_ok = 1;}
void __init arch_zone_limits_init(unsigned long *max_zone_pfns){ max_zone_pfns[ZONE_NORMAL] = high_physmem >> PAGE_SHIFT;}
/* * This can't do anything because nothing in the kernel image can be freed * since it's not in kernel physical memory. */
void free_initmem(void){}
/* Allocate and free page tables. */
pgd_t *pgd_alloc(struct mm_struct *mm){ pgd_t *pgd = __pgd_alloc(mm, 0);
if (pgd) memcpy(pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
return pgd;}
void *uml_kmalloc(int size, int flags){ return kmalloc(size, flags);}
static const pgprot_t protection_map[16] = { [VM_NONE] = PAGE_NONE, [VM_READ] = PAGE_READONLY, [VM_WRITE] = PAGE_COPY, [VM_WRITE | VM_READ] = PAGE_COPY, [VM_EXEC] = PAGE_READONLY, [VM_EXEC | VM_READ] = PAGE_READONLY, [VM_EXEC | VM_WRITE] = PAGE_COPY, [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY, [VM_SHARED] = PAGE_NONE, [VM_SHARED | VM_READ] = PAGE_READONLY, [VM_SHARED | VM_WRITE] = PAGE_SHARED, [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, [VM_SHARED | VM_EXEC] = PAGE_READONLY, [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY, [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED, [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED};DECLARE_VM_GET_PAGE_PROT
void mark_rodata_ro(void){ unsigned long rodata_start = PFN_ALIGN(__start_rodata); unsigned long rodata_end = PFN_ALIGN(__end_rodata);
os_protect_memory((void *)rodata_start, rodata_end - rodata_start, 1, 0, 0);}