1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __MMU_H
3 #define __MMU_H
4 
5 /*
6  * Privileged Space Mapping Buffer (PMB) definitions
7  */
8 #define PMB_PASCR		0xff000070
9 #define PMB_IRMCR		0xff000078
10 
11 #define PASCR_SE		0x80000000
12 
13 #define PMB_ADDR		0xf6100000
14 #define PMB_DATA		0xf7100000
15 
16 #define NR_PMB_ENTRIES		16
17 
18 #define PMB_E_MASK		0x0000000f
19 #define PMB_E_SHIFT		8
20 
21 #define PMB_PFN_MASK		0xff000000
22 
23 #define PMB_SZ_16M		0x00000000
24 #define PMB_SZ_64M		0x00000010
25 #define PMB_SZ_128M		0x00000080
26 #define PMB_SZ_512M		0x00000090
27 #define PMB_SZ_MASK		PMB_SZ_512M
28 #define PMB_C			0x00000008
29 #define PMB_WT			0x00000001
30 #define PMB_UB			0x00000200
31 #define PMB_CACHE_MASK		(PMB_C | PMB_WT | PMB_UB)
32 #define PMB_V			0x00000100
33 
34 #define PMB_NO_ENTRY		(-1)
35 
36 #ifndef __ASSEMBLY__
37 #include <linux/errno.h>
38 #include <linux/threads.h>
39 #include <asm/page.h>
40 
41 /* Default "unsigned long" context */
42 typedef unsigned long mm_context_id_t[NR_CPUS];
43 
44 typedef struct {
45 #ifdef CONFIG_MMU
46 	mm_context_id_t		id;
47 	void			*vdso;
48 #else
49 	unsigned long		end_brk;
50 #endif
51 #ifdef CONFIG_BINFMT_ELF_FDPIC
52 	unsigned long		exec_fdpic_loadmap;
53 	unsigned long		interp_fdpic_loadmap;
54 #endif
55 } mm_context_t;
56 
57 #ifdef CONFIG_PMB
58 /* arch/sh/mm/pmb.c */
59 bool __in_29bit_mode(void);
60 
61 void pmb_init(void);
62 int pmb_bolt_mapping(unsigned long virt, phys_addr_t phys,
63 		     unsigned long size, pgprot_t prot);
64 void __iomem *pmb_remap_caller(phys_addr_t phys, unsigned long size,
65 			       pgprot_t prot, void *caller);
66 int pmb_unmap(void __iomem *addr);
67 
68 #else
69 
70 static inline int
pmb_bolt_mapping(unsigned long virt,phys_addr_t phys,unsigned long size,pgprot_t prot)71 pmb_bolt_mapping(unsigned long virt, phys_addr_t phys,
72 		 unsigned long size, pgprot_t prot)
73 {
74 	return -EINVAL;
75 }
76 
77 static inline void __iomem *
pmb_remap_caller(phys_addr_t phys,unsigned long size,pgprot_t prot,void * caller)78 pmb_remap_caller(phys_addr_t phys, unsigned long size,
79 		 pgprot_t prot, void *caller)
80 {
81 	return NULL;
82 }
83 
pmb_unmap(void __iomem * addr)84 static inline int pmb_unmap(void __iomem *addr)
85 {
86 	return -EINVAL;
87 }
88 
89 #define pmb_init(addr)		do { } while (0)
90 
91 #ifdef CONFIG_29BIT
92 #define __in_29bit_mode()	(1)
93 #else
94 #define __in_29bit_mode()	(0)
95 #endif
96 
97 #endif /* CONFIG_PMB */
98 
99 static inline void __iomem *
pmb_remap(phys_addr_t phys,unsigned long size,pgprot_t prot)100 pmb_remap(phys_addr_t phys, unsigned long size, pgprot_t prot)
101 {
102 	return pmb_remap_caller(phys, size, prot, __builtin_return_address(0));
103 }
104 
105 #endif /* __ASSEMBLY__ */
106 
107 #endif /* __MMU_H */
108