[linux-2.6-block.git] / mm / init-mm.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/mm_types.h>
#include <linux/maple_tree.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/cpumask.h>
#include <linux/mman.h>
#include <linux/pgtable.h>

#include <linux/atomic.h>
#include <linux/user_namespace.h>
#include <linux/iommu.h>
#include <asm/mmu.h>

#ifndef INIT_MM_CONTEXT
#define INIT_MM_CONTEXT(name)
#endif

/*
 * For dynamically allocated mm_structs, there is a dynamically sized cpumask
 * at the end of the structure, the size of which depends on the maximum CPU
 * number the system can see. That way we allocate only as much memory for
 * mm_cpumask() as needed for the hundreds, or thousands of processes that
 * a system typically runs.
 *
 * Since there is only one init_mm in the entire system, keep it simple
 * and size this cpu_bitmask to NR_CPUS.
 */
struct mm_struct init_mm = {
	.mm_mt		= MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),
	.pgd		= swapper_pg_dir,
	.mm_users	= ATOMIC_INIT(2),
	.mm_count	= ATOMIC_INIT(1),
	.write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
	MMAP_LOCK_INITIALIZER(init_mm)
	.page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
	.arg_lock	=  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
	.mmlist		= LIST_HEAD_INIT(init_mm.mmlist),
	.user_ns	= &init_user_ns,
	.cpu_bitmap	= CPU_BITS_NONE,
#ifdef CONFIG_IOMMU_SVA
	.pasid		= IOMMU_PASID_INVALID,
#endif
	INIT_MM_CONTEXT(init_mm)
};

void setup_initial_init_mm(void *start_code, void *end_code,
			   void *end_data, void *brk)
{
	init_mm.start_code = (unsigned long)start_code;
	init_mm.end_code = (unsigned long)end_code;
	init_mm.end_data = (unsigned long)end_data;
	init_mm.brk = (unsigned long)brk;
}
Commit	Line	Data
	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	/*
	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_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 = IOMMU_PASID_INVALID,
	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	}