Merge tag 'parisc-for-6.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[linux-2.6-microblaze.git] / mm / init-mm.c
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 #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  */
30 struct mm_struct init_mm = {
31         .mm_rb          = RB_ROOT,
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
48 void 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 }