1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_MMU_CONTEXT_64_H
3 #define __ASM_SH_MMU_CONTEXT_64_H
4
5 /*
6 * sh64-specific mmu_context interface.
7 *
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003 - 2007 Paul Mundt
10 */
11 #include <cpu/registers.h>
12 #include <asm/cacheflush.h>
13
14 #define SR_ASID_MASK 0xffffffffff00ffffULL
15 #define SR_ASID_SHIFT 16
16
17 /*
18 * Destroy context related info for an mm_struct that is about
19 * to be put to rest.
20 */
destroy_context(struct mm_struct * mm)21 static inline void destroy_context(struct mm_struct *mm)
22 {
23 /* Well, at least free TLB entries */
24 flush_tlb_mm(mm);
25 }
26
get_asid(void)27 static inline unsigned long get_asid(void)
28 {
29 unsigned long long sr;
30
31 asm volatile ("getcon " __SR ", %0\n\t"
32 : "=r" (sr));
33
34 sr = (sr >> SR_ASID_SHIFT) & MMU_CONTEXT_ASID_MASK;
35 return (unsigned long) sr;
36 }
37
38 /* Set ASID into SR */
set_asid(unsigned long asid)39 static inline void set_asid(unsigned long asid)
40 {
41 unsigned long long sr, pc;
42
43 asm volatile ("getcon " __SR ", %0" : "=r" (sr));
44
45 sr = (sr & SR_ASID_MASK) | (asid << SR_ASID_SHIFT);
46
47 /*
48 * It is possible that this function may be inlined and so to avoid
49 * the assembler reporting duplicate symbols we make use of the
50 * gas trick of generating symbols using numerics and forward
51 * reference.
52 */
53 asm volatile ("movi 1, %1\n\t"
54 "shlli %1, 28, %1\n\t"
55 "or %0, %1, %1\n\t"
56 "putcon %1, " __SR "\n\t"
57 "putcon %0, " __SSR "\n\t"
58 "movi 1f, %1\n\t"
59 "ori %1, 1 , %1\n\t"
60 "putcon %1, " __SPC "\n\t"
61 "rte\n"
62 "1:\n\t"
63 : "=r" (sr), "=r" (pc) : "0" (sr));
64 }
65
66 /* arch/sh/kernel/cpu/sh5/entry.S */
67 extern unsigned long switch_and_save_asid(unsigned long new_asid);
68
69 /* No spare register to twiddle, so use a software cache */
70 extern pgd_t *mmu_pdtp_cache;
71
72 #define set_TTB(pgd) (mmu_pdtp_cache = (pgd))
73 #define get_TTB() (mmu_pdtp_cache)
74
75 #endif /* __ASM_SH_MMU_CONTEXT_64_H */
76