[linux-2.6-block.git] / arch / arm64 / include / asm / pgtable-prot.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2016 ARM Ltd.
 */
#ifndef __ASM_PGTABLE_PROT_H
#define __ASM_PGTABLE_PROT_H

#include <asm/memory.h>
#include <asm/pgtable-hwdef.h>

#include <linux/const.h>

/*
 * Software defined PTE bits definition.
 */
#define PTE_WRITE		(PTE_DBM)		 /* same as DBM (51) */
#define PTE_SWP_EXCLUSIVE	(_AT(pteval_t, 1) << 2)	 /* only for swp ptes */
#define PTE_DIRTY		(_AT(pteval_t, 1) << 55)
#define PTE_SPECIAL		(_AT(pteval_t, 1) << 56)
#define PTE_DEVMAP		(_AT(pteval_t, 1) << 57)
#define PTE_PROT_NONE		(_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */

/*
 * This bit indicates that the entry is present i.e. pmd_page()
 * still points to a valid huge page in memory even if the pmd
 * has been invalidated.
 */
#define PMD_PRESENT_INVALID	(_AT(pteval_t, 1) << 59) /* only when !PMD_SECT_VALID */

#define _PROT_DEFAULT		(PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
#define _PROT_SECT_DEFAULT	(PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)

#define PROT_DEFAULT		(_PROT_DEFAULT | PTE_MAYBE_NG)
#define PROT_SECT_DEFAULT	(_PROT_SECT_DEFAULT | PMD_MAYBE_NG)

#define PROT_DEVICE_nGnRnE	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE))
#define PROT_DEVICE_nGnRE	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE))
#define PROT_NORMAL_NC		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC))
#define PROT_NORMAL		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL))
#define PROT_NORMAL_TAGGED	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_TAGGED))

#define PROT_SECT_DEVICE_nGnRE	(PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE))
#define PROT_SECT_NORMAL	(PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PTE_WRITE | PMD_ATTRINDX(MT_NORMAL))
#define PROT_SECT_NORMAL_EXEC	(PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))

#define _PAGE_DEFAULT		(_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))

#define _PAGE_KERNEL		(PROT_NORMAL)
#define _PAGE_KERNEL_RO		((PROT_NORMAL & ~PTE_WRITE) | PTE_RDONLY)
#define _PAGE_KERNEL_ROX	((PROT_NORMAL & ~(PTE_WRITE | PTE_PXN)) | PTE_RDONLY)
#define _PAGE_KERNEL_EXEC	(PROT_NORMAL & ~PTE_PXN)
#define _PAGE_KERNEL_EXEC_CONT	((PROT_NORMAL & ~PTE_PXN) | PTE_CONT)

#define _PAGE_SHARED		(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
#define _PAGE_SHARED_EXEC	(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_WRITE)
#define _PAGE_READONLY		(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
#define _PAGE_READONLY_EXEC	(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN)
#define _PAGE_EXECONLY		(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN)

#ifdef __ASSEMBLY__
#define PTE_MAYBE_NG	0
#endif

#ifndef __ASSEMBLY__

#include <asm/cpufeature.h>
#include <asm/pgtable-types.h>

extern bool arm64_use_ng_mappings;

#define PTE_MAYBE_NG		(arm64_use_ng_mappings ? PTE_NG : 0)
#define PMD_MAYBE_NG		(arm64_use_ng_mappings ? PMD_SECT_NG : 0)

/*
 * If we have userspace only BTI we don't want to mark kernel pages
 * guarded even if the system does support BTI.
 */
#ifdef CONFIG_ARM64_BTI_KERNEL
#define PTE_MAYBE_GP		(system_supports_bti() ? PTE_GP : 0)
#else
#define PTE_MAYBE_GP		0
#endif

#define PAGE_KERNEL		__pgprot(_PAGE_KERNEL)
#define PAGE_KERNEL_RO		__pgprot(_PAGE_KERNEL_RO)
#define PAGE_KERNEL_ROX		__pgprot(_PAGE_KERNEL_ROX)
#define PAGE_KERNEL_EXEC	__pgprot(_PAGE_KERNEL_EXEC)
#define PAGE_KERNEL_EXEC_CONT	__pgprot(_PAGE_KERNEL_EXEC_CONT)

#define PAGE_S2_MEMATTR(attr, has_fwb)					\
	({								\
		u64 __val;						\
		if (has_fwb)						\
			__val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr);	\
		else							\
			__val = PTE_S2_MEMATTR(MT_S2_ ## attr);		\
		__val;							\
	 })

#define PAGE_NONE		__pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
/* shared+writable pages are clean by default, hence PTE_RDONLY|PTE_WRITE */
#define PAGE_SHARED		__pgprot(_PAGE_SHARED)
#define PAGE_SHARED_EXEC	__pgprot(_PAGE_SHARED_EXEC)
#define PAGE_READONLY		__pgprot(_PAGE_READONLY)
#define PAGE_READONLY_EXEC	__pgprot(_PAGE_READONLY_EXEC)
#define PAGE_EXECONLY		__pgprot(_PAGE_EXECONLY)

#endif /* __ASSEMBLY__ */

#endif /* __ASM_PGTABLE_PROT_H */
Commit	Line	Data
caab277b	1	/* SPDX-License-Identifier: GPL-2.0-only */
3eca86e7 MR	2	/*
3eca86e7 MR	3	* Copyright (C) 2016 ARM Ltd.
3eca86e7 MR	4	*/
	5	#ifndef __ASM_PGTABLE_PROT_H
	6	#define __ASM_PGTABLE_PROT_H
	7
	8	#include <asm/memory.h>
	9	#include <asm/pgtable-hwdef.h>
	10
	11	#include <linux/const.h>
	12
	13	/*
	14	* Software defined PTE bits definition.
	15	*/
3eca86e7	16	#define PTE_WRITE (PTE_DBM) /* same as DBM (51) */
570ef363	17	#define PTE_SWP_EXCLUSIVE (_AT(pteval_t, 1) << 2) /* only for swp ptes */
3eca86e7 MR	18	#define PTE_DIRTY (_AT(pteval_t, 1) << 55)
3eca86e7 MR	19	#define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
73b20c84	20	#define PTE_DEVMAP (_AT(pteval_t, 1) << 57)
3eca86e7 MR	21	#define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
3eca86e7 MR	22
b65399f6 AK	23	/*
	24	* This bit indicates that the entry is present i.e. pmd_page()
	25	* still points to a valid huge page in memory even if the pmd
	26	* has been invalidated.
	27	*/
	28	#define PMD_PRESENT_INVALID (_AT(pteval_t, 1) << 59) /* only when !PMD_SECT_VALID */
	29
fa4cdcca JG	30	#define _PROT_DEFAULT (PTE_TYPE_PAGE \| PTE_AF \| PTE_SHARED)
	31	#define _PROT_SECT_DEFAULT (PMD_TYPE_SECT \| PMD_SECT_AF \| PMD_SECT_S)
	32
	33	#define PROT_DEFAULT (_PROT_DEFAULT \| PTE_MAYBE_NG)
	34	#define PROT_SECT_DEFAULT (_PROT_SECT_DEFAULT \| PMD_MAYBE_NG)
	35
	36	#define PROT_DEVICE_nGnRnE (PROT_DEFAULT \| PTE_PXN \| PTE_UXN \| PTE_WRITE \| PTE_ATTRINDX(MT_DEVICE_nGnRnE))
	37	#define PROT_DEVICE_nGnRE (PROT_DEFAULT \| PTE_PXN \| PTE_UXN \| PTE_WRITE \| PTE_ATTRINDX(MT_DEVICE_nGnRE))
	38	#define PROT_NORMAL_NC (PROT_DEFAULT \| PTE_PXN \| PTE_UXN \| PTE_WRITE \| PTE_ATTRINDX(MT_NORMAL_NC))
	39	#define PROT_NORMAL (PROT_DEFAULT \| PTE_PXN \| PTE_UXN \| PTE_WRITE \| PTE_ATTRINDX(MT_NORMAL))
	40	#define PROT_NORMAL_TAGGED (PROT_DEFAULT \| PTE_PXN \| PTE_UXN \| PTE_WRITE \| PTE_ATTRINDX(MT_NORMAL_TAGGED))
	41
	42	#define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT \| PMD_SECT_PXN \| PMD_SECT_UXN \| PMD_ATTRINDX(MT_DEVICE_nGnRE))
	43	#define PROT_SECT_NORMAL (PROT_SECT_DEFAULT \| PMD_SECT_PXN \| PMD_SECT_UXN \| PTE_WRITE \| PMD_ATTRINDX(MT_NORMAL))
	44	#define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT \| PMD_SECT_UXN \| PMD_ATTRINDX(MT_NORMAL))
	45
	46	#define _PAGE_DEFAULT (_PROT_DEFAULT \| PTE_ATTRINDX(MT_NORMAL))
	47
	48	#define _PAGE_KERNEL (PROT_NORMAL)
	49	#define _PAGE_KERNEL_RO ((PROT_NORMAL & ~PTE_WRITE) \| PTE_RDONLY)
	50	#define _PAGE_KERNEL_ROX ((PROT_NORMAL & ~(PTE_WRITE \| PTE_PXN)) \| PTE_RDONLY)
	51	#define _PAGE_KERNEL_EXEC (PROT_NORMAL & ~PTE_PXN)
	52	#define _PAGE_KERNEL_EXEC_CONT ((PROT_NORMAL & ~PTE_PXN) \| PTE_CONT)
	53
	54	#define _PAGE_SHARED (_PAGE_DEFAULT \| PTE_USER \| PTE_RDONLY \| PTE_NG \| PTE_PXN \| PTE_UXN \| PTE_WRITE)
	55	#define _PAGE_SHARED_EXEC (_PAGE_DEFAULT \| PTE_USER \| PTE_RDONLY \| PTE_NG \| PTE_PXN \| PTE_WRITE)
	56	#define _PAGE_READONLY (_PAGE_DEFAULT \| PTE_USER \| PTE_RDONLY \| PTE_NG \| PTE_PXN \| PTE_UXN)
	57	#define _PAGE_READONLY_EXEC (_PAGE_DEFAULT \| PTE_USER \| PTE_RDONLY \| PTE_NG \| PTE_PXN)
	58	#define _PAGE_EXECONLY (_PAGE_DEFAULT \| PTE_RDONLY \| PTE_NG \| PTE_PXN)
	59
	60	#ifdef __ASSEMBLY__
	61	#define PTE_MAYBE_NG 0
	62	#endif
	63
3eca86e7 MR	64	#ifndef __ASSEMBLY__
3eca86e7 MR	65
c8027285	66	#include <asm/cpufeature.h>
3eca86e7 MR	67	#include <asm/pgtable-types.h>
3eca86e7 MR	68
c8355785 WD	69	extern bool arm64_use_ng_mappings;
c8355785 WD	70
c8355785 WD	71	#define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0)
c8355785 WD	72	#define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0)
41acec62	73
e4e9f6df MB	74	/*
	75	* If we have userspace only BTI we don't want to mark kernel pages
	76	* guarded even if the system does support BTI.
	77	*/
	78	#ifdef CONFIG_ARM64_BTI_KERNEL
c8027285	79	#define PTE_MAYBE_GP (system_supports_bti() ? PTE_GP : 0)
e4e9f6df MB	80	#else
	81	#define PTE_MAYBE_GP 0
	82	#endif
c8027285	83
fa4cdcca JG	84	#define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
	85	#define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL_RO)
	86	#define PAGE_KERNEL_ROX __pgprot(_PAGE_KERNEL_ROX)
	87	#define PAGE_KERNEL_EXEC __pgprot(_PAGE_KERNEL_EXEC)
	88	#define PAGE_KERNEL_EXEC_CONT __pgprot(_PAGE_KERNEL_EXEC_CONT)
3eca86e7	89
bc224df1	90	#define PAGE_S2_MEMATTR(attr, has_fwb) \
e48d53a9 MZ	91	({ \
e48d53a9 MZ	92	u64 __val; \
bc224df1	93	if (has_fwb) \
e48d53a9 MZ	94	__val = PTE_S2_MEMATTR(MT_S2_FWB_ ## attr); \
	95	else \
	96	__val = PTE_S2_MEMATTR(MT_S2_ ## attr); \
	97	__val; \
	98	})
	99
e046eb0c	100	#define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) \| PTE_PROT_NONE \| PTE_RDONLY \| PTE_NG \| PTE_PXN \| PTE_UXN)
aa57157b	101	/* shared+writable pages are clean by default, hence PTE_RDONLY\|PTE_WRITE */
fa4cdcca JG	102	#define PAGE_SHARED __pgprot(_PAGE_SHARED)
	103	#define PAGE_SHARED_EXEC __pgprot(_PAGE_SHARED_EXEC)
	104	#define PAGE_READONLY __pgprot(_PAGE_READONLY)
	105	#define PAGE_READONLY_EXEC __pgprot(_PAGE_READONLY_EXEC)
	106	#define PAGE_EXECONLY __pgprot(_PAGE_EXECONLY)
3eca86e7	107
3eca86e7 MR	108	#endif /* __ASSEMBLY__ */
	109
	110	#endif /* __ASM_PGTABLE_PROT_H */