Merge patch series "riscv: dma-mapping: unify support for cache flushes"
[platform/kernel/linux-starfive.git] / mm / init-mm.c
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/iommu.h>
14 #include <asm/mmu.h>
15
16 #ifndef INIT_MM_CONTEXT
17 #define INIT_MM_CONTEXT(name)
18 #endif
19
20 const struct vm_operations_struct vma_dummy_vm_ops;
21
22 /*
23  * For dynamically allocated mm_structs, there is a dynamically sized cpumask
24  * at the end of the structure, the size of which depends on the maximum CPU
25  * number the system can see. That way we allocate only as much memory for
26  * mm_cpumask() as needed for the hundreds, or thousands of processes that
27  * a system typically runs.
28  *
29  * Since there is only one init_mm in the entire system, keep it simple
30  * and size this cpu_bitmask to NR_CPUS.
31  */
32 struct mm_struct init_mm = {
33         .mm_mt          = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),
34         .pgd            = swapper_pg_dir,
35         .mm_users       = ATOMIC_INIT(2),
36         .mm_count       = ATOMIC_INIT(1),
37         .write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
38         MMAP_LOCK_INITIALIZER(init_mm)
39         .page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
40         .arg_lock       =  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
41         .mmlist         = LIST_HEAD_INIT(init_mm.mmlist),
42 #ifdef CONFIG_PER_VMA_LOCK
43         .mm_lock_seq    = 0,
44 #endif
45         .user_ns        = &init_user_ns,
46         .cpu_bitmap     = CPU_BITS_NONE,
47 #ifdef CONFIG_IOMMU_SVA
48         .pasid          = IOMMU_PASID_INVALID,
49 #endif
50         INIT_MM_CONTEXT(init_mm)
51 };
52
53 void setup_initial_init_mm(void *start_code, void *end_code,
54                            void *end_data, void *brk)
55 {
56         init_mm.start_code = (unsigned long)start_code;
57         init_mm.end_code = (unsigned long)end_code;
58         init_mm.end_data = (unsigned long)end_data;
59         init_mm.brk = (unsigned long)brk;
60 }