1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/mm_types.h>
 3#include <linux/rbtree.h>
 4#include <linux/rwsem.h>
 5#include <linux/spinlock.h>
 6#include <linux/list.h>
 7#include <linux/cpumask.h>
 
 
 8
 9#include <linux/atomic.h>
10#include <linux/user_namespace.h>
11#include <asm/pgtable.h>
12#include <asm/mmu.h>
13
14#ifndef INIT_MM_CONTEXT
15#define INIT_MM_CONTEXT(name)
16#endif
17
 
 
 
 
 
 
 
 
 
 
18struct mm_struct init_mm = {
19	.mm_rb		= RB_ROOT,
20	.pgd		= swapper_pg_dir,
21	.mm_users	= ATOMIC_INIT(2),
22	.mm_count	= ATOMIC_INIT(1),
23	.mmap_sem	= __RWSEM_INITIALIZER(init_mm.mmap_sem),
 
24	.page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
 
25	.mmlist		= LIST_HEAD_INIT(init_mm.mmlist),
26	.user_ns	= &init_user_ns,
 
 
 
 
27	INIT_MM_CONTEXT(init_mm)
28};

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/mm_types.h>
 3#include <linux/maple_tree.h>
 4#include <linux/rwsem.h>
 5#include <linux/spinlock.h>
 6#include <linux/list.h>
 7#include <linux/cpumask.h>
 8#include <linux/mman.h>
 9#include <linux/pgtable.h>
10
11#include <linux/atomic.h>
12#include <linux/user_namespace.h>
13#include <linux/ioasid.h>
14#include <asm/mmu.h>
15
16#ifndef INIT_MM_CONTEXT
17#define INIT_MM_CONTEXT(name)
18#endif
19
20/*
21 * For dynamically allocated mm_structs, there is a dynamically sized cpumask
22 * at the end of the structure, the size of which depends on the maximum CPU
23 * number the system can see. That way we allocate only as much memory for
24 * mm_cpumask() as needed for the hundreds, or thousands of processes that
25 * a system typically runs.
26 *
27 * Since there is only one init_mm in the entire system, keep it simple
28 * and size this cpu_bitmask to NR_CPUS.
29 */
30struct mm_struct init_mm = {
31	.mm_mt		= MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),
32	.pgd		= swapper_pg_dir,
33	.mm_users	= ATOMIC_INIT(2),
34	.mm_count	= ATOMIC_INIT(1),
35	.write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
36	MMAP_LOCK_INITIALIZER(init_mm)
37	.page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
38	.arg_lock	=  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
39	.mmlist		= LIST_HEAD_INIT(init_mm.mmlist),
40	.user_ns	= &init_user_ns,
41	.cpu_bitmap	= CPU_BITS_NONE,
42#ifdef CONFIG_IOMMU_SVA
43	.pasid		= INVALID_IOASID,
44#endif
45	INIT_MM_CONTEXT(init_mm)
46};
47
48void setup_initial_init_mm(void *start_code, void *end_code,
49			   void *end_data, void *brk)
50{
51	init_mm.start_code = (unsigned long)start_code;
52	init_mm.end_code = (unsigned long)end_code;
53	init_mm.end_data = (unsigned long)end_data;
54	init_mm.brk = (unsigned long)brk;
55}