[mirror_ubuntu-disco-kernel.git] / arch / x86 / include / asm / mmu.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_MMU_H
#define _ASM_X86_MMU_H

#include <linux/spinlock.h>
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <linux/atomic.h>

/*
 * x86 has arch-specific MMU state beyond what lives in mm_struct.
 */
typedef struct {
	/*
	 * ctx_id uniquely identifies this mm_struct.  A ctx_id will never
	 * be reused, and zero is not a valid ctx_id.
	 */
	u64 ctx_id;

	/*
	 * Any code that needs to do any sort of TLB flushing for this
	 * mm will first make its changes to the page tables, then
	 * increment tlb_gen, then flush.  This lets the low-level
	 * flushing code keep track of what needs flushing.
	 *
	 * This is not used on Xen PV.
	 */
	atomic64_t tlb_gen;

#ifdef CONFIG_MODIFY_LDT_SYSCALL
	struct rw_semaphore	ldt_usr_sem;
	struct ldt_struct	*ldt;
#endif

#ifdef CONFIG_X86_64
	/* True if mm supports a task running in 32 bit compatibility mode. */
	unsigned short ia32_compat;
#endif

	struct mutex lock;
	void __user *vdso;			/* vdso base address */
	const struct vdso_image *vdso_image;	/* vdso image in use */

	atomic_t perf_rdpmc_allowed;	/* nonzero if rdpmc is allowed */
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
	/*
	 * One bit per protection key says whether userspace can
	 * use it or not.  protected by mmap_sem.
	 */
	u16 pkey_allocation_map;
	s16 execute_only_pkey;
#endif
#ifdef CONFIG_X86_INTEL_MPX
	/* address of the bounds directory */
	void __user *bd_addr;
#endif
} mm_context_t;

#define INIT_MM_CONTEXT(mm)						\
	.context = {							\
		.ctx_id = 1,						\
	}

void leave_mm(int cpu);

#endif /* _ASM_X86_MMU_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1965aae3 PA	2	#ifndef _ASM_X86_MMU_H
1965aae3 PA	3	#define _ASM_X86_MMU_H
70353023 CS	4
70353023 CS	5	#include <linux/spinlock.h>
c2b3496b	6	#include <linux/rwsem.h>
70353023	7	#include <linux/mutex.h>
f39681ed	8	#include <linux/atomic.h>
70353023 CS	9
70353023 CS	10	/*
f39681ed	11	* x86 has arch-specific MMU state beyond what lives in mm_struct.
70353023	12	*/
710d0e9c	13	typedef struct {
f39681ed AL	14	/*
	15	* ctx_id uniquely identifies this mm_struct. A ctx_id will never
	16	* be reused, and zero is not a valid ctx_id.
	17	*/
	18	u64 ctx_id;
	19
	20	/*
	21	* Any code that needs to do any sort of TLB flushing for this
	22	* mm will first make its changes to the page tables, then
	23	* increment tlb_gen, then flush. This lets the low-level
	24	* flushing code keep track of what needs flushing.
	25	*
	26	* This is not used on Xen PV.
	27	*/
	28	atomic64_t tlb_gen;
	29
a5b9e5a2	30	#ifdef CONFIG_MODIFY_LDT_SYSCALL
c2b3496b PZ	31	struct rw_semaphore ldt_usr_sem;
c2b3496b PZ	32	struct ldt_struct *ldt;
a5b9e5a2	33	#endif
c2ef45df SW	34
	35	#ifdef CONFIG_X86_64
	36	/* True if mm supports a task running in 32 bit compatibility mode. */
	37	unsigned short ia32_compat;
	38	#endif
	39
af6a25f0	40	struct mutex lock;
352b78c6 AL	41	void __user vdso; / vdso base address */
352b78c6 AL	42	const struct vdso_image vdso_image; / vdso image in use */
7911d3f7 AL	43
7911d3f7 AL	44	atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */
e8c24d3a DH	45	#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
	46	/*
	47	* One bit per protection key says whether userspace can
	48	* use it or not. protected by mmap_sem.
	49	*/
	50	u16 pkey_allocation_map;
	51	s16 execute_only_pkey;
	52	#endif
cb02de96 MR	53	#ifdef CONFIG_X86_INTEL_MPX
	54	/* address of the bounds directory */
	55	void __user *bd_addr;
	56	#endif
70353023 CS	57	} mm_context_t;
70353023 CS	58
f39681ed AL	59	#define INIT_MM_CONTEXT(mm) \
	60	.context = { \
	61	.ctx_id = 1, \
	62	}
	63
bde6f5f5	64	void leave_mm(int cpu);
bde6f5f5	65
1965aae3	66	#endif /* _ASM_X86_MMU_H */