xref: /openbmc/linux/arch/arc/include/asm/mmu-arcv2.h (revision 2cc1121b)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2004, 2007-2010, 2011-2012, 2019-20 Synopsys, Inc. (www.synopsys.com)
4  *
5  * MMUv3 (arc700) / MMUv4 (archs) are software page walked and software managed.
6  * This file contains the TLB access registers and commands
7  */
8 
9 #ifndef _ASM_ARC_MMU_ARCV2_H
10 #define _ASM_ARC_MMU_ARCV2_H
11 
12 /*
13  * TLB Management regs
14  */
15 #define ARC_REG_MMU_BCR		0x06f
16 
17 #ifdef CONFIG_ARC_MMU_V3
18 #define ARC_REG_TLBPD0		0x405
19 #define ARC_REG_TLBPD1		0x406
20 #define ARC_REG_TLBPD1HI	0	/* Dummy: allows common code */
21 #define ARC_REG_TLBINDEX	0x407
22 #define ARC_REG_TLBCOMMAND	0x408
23 #define ARC_REG_PID		0x409
24 #define ARC_REG_SCRATCH_DATA0	0x418
25 #else
26 #define ARC_REG_TLBPD0		0x460
27 #define ARC_REG_TLBPD1		0x461
28 #define ARC_REG_TLBPD1HI	0x463
29 #define ARC_REG_TLBINDEX	0x464
30 #define ARC_REG_TLBCOMMAND	0x465
31 #define ARC_REG_PID		0x468
32 #define ARC_REG_SCRATCH_DATA0	0x46c
33 #endif
34 
35 /* Bits in MMU PID reg */
36 #define __TLB_ENABLE		(1 << 31)
37 #define __PROG_ENABLE		(1 << 30)
38 #define MMU_ENABLE		(__TLB_ENABLE | __PROG_ENABLE)
39 
40 /* Bits in TLB Index reg */
41 #define TLB_LKUP_ERR		0x80000000
42 
43 #ifdef CONFIG_ARC_MMU_V3
44 #define TLB_DUP_ERR		(TLB_LKUP_ERR | 0x00000001)
45 #else
46 #define TLB_DUP_ERR		(TLB_LKUP_ERR | 0x40000000)
47 #endif
48 
49 /*
50  * TLB Commands
51  */
52 #define TLBWrite    		0x1
53 #define TLBRead     		0x2
54 #define TLBGetIndex 		0x3
55 #define TLBProbe    		0x4
56 #define TLBWriteNI		0x5  /* write JTLB without inv uTLBs */
57 #define TLBIVUTLB		0x6  /* explicitly inv uTLBs */
58 
59 #ifdef CONFIG_ARC_MMU_V4
60 #define TLBInsertEntry		0x7
61 #define TLBDeleteEntry		0x8
62 #endif
63 
64 /* Masks for actual TLB "PD"s */
65 #define PTE_BITS_IN_PD0		(_PAGE_GLOBAL | _PAGE_PRESENT | _PAGE_HW_SZ)
66 #define PTE_BITS_RWX		(_PAGE_EXECUTE | _PAGE_WRITE | _PAGE_READ)
67 
68 #define PTE_BITS_NON_RWX_IN_PD1	(PAGE_MASK_PHYS | _PAGE_CACHEABLE)
69 
70 #ifndef __ASSEMBLY__
71 
72 struct mm_struct;
73 extern int pae40_exist_but_not_enab(void);
74 
is_pae40_enabled(void)75 static inline int is_pae40_enabled(void)
76 {
77 	return IS_ENABLED(CONFIG_ARC_HAS_PAE40);
78 }
79 
mmu_setup_asid(struct mm_struct * mm,unsigned long asid)80 static inline void mmu_setup_asid(struct mm_struct *mm, unsigned long asid)
81 {
82 	write_aux_reg(ARC_REG_PID, asid | MMU_ENABLE);
83 }
84 
mmu_setup_pgd(struct mm_struct * mm,void * pgd)85 static inline void mmu_setup_pgd(struct mm_struct *mm, void *pgd)
86 {
87 	/* PGD cached in MMU reg to avoid 3 mem lookups: task->mm->pgd */
88 #ifdef CONFIG_ISA_ARCV2
89 	write_aux_reg(ARC_REG_SCRATCH_DATA0, (unsigned int)pgd);
90 #endif
91 }
92 
93 #else
94 
95 .macro ARC_MMU_REENABLE reg
96 	lr \reg, [ARC_REG_PID]
97 	or \reg, \reg, MMU_ENABLE
98 	sr \reg, [ARC_REG_PID]
99 .endm
100 
101 #endif /* !__ASSEMBLY__ */
102 
103 #endif
104