diff options
author | Paul Mundt <lethal@linux-sh.org> | 2007-11-09 02:37:18 -0500 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2008-01-27 23:18:41 -0500 |
commit | cdcc970829e81da3445346cb71b2ea264c9952b9 (patch) | |
tree | 0a82de87d6b2d8b86d8b5badd58daec44b026d68 /include/asm-sh/mmu_context_64.h | |
parent | 9085fa1255fc16bf0dbd217e9f4cdccf16f064d3 (diff) |
sh: Move in the SH-5 mmu_context headers.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/asm-sh/mmu_context_64.h')
-rw-r--r-- | include/asm-sh/mmu_context_64.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/include/asm-sh/mmu_context_64.h b/include/asm-sh/mmu_context_64.h new file mode 100644 index 000000000000..020be744b088 --- /dev/null +++ b/include/asm-sh/mmu_context_64.h | |||
@@ -0,0 +1,75 @@ | |||
1 | #ifndef __ASM_SH_MMU_CONTEXT_64_H | ||
2 | #define __ASM_SH_MMU_CONTEXT_64_H | ||
3 | |||
4 | /* | ||
5 | * sh64-specific mmu_context interface. | ||
6 | * | ||
7 | * Copyright (C) 2000, 2001 Paolo Alberelli | ||
8 | * Copyright (C) 2003 - 2007 Paul Mundt | ||
9 | * | ||
10 | * This file is subject to the terms and conditions of the GNU General Public | ||
11 | * License. See the file "COPYING" in the main directory of this archive | ||
12 | * for more details. | ||
13 | */ | ||
14 | #include <asm/cpu/registers.h> | ||
15 | #include <asm/cacheflush.h> | ||
16 | |||
17 | #define SR_ASID_MASK 0xffffffffff00ffffULL | ||
18 | #define SR_ASID_SHIFT 16 | ||
19 | |||
20 | /* | ||
21 | * Destroy context related info for an mm_struct that is about | ||
22 | * to be put to rest. | ||
23 | */ | ||
24 | static inline void destroy_context(struct mm_struct *mm) | ||
25 | { | ||
26 | /* Well, at least free TLB entries */ | ||
27 | flush_tlb_mm(mm); | ||
28 | } | ||
29 | |||
30 | static inline unsigned long get_asid(void) | ||
31 | { | ||
32 | unsigned long long sr; | ||
33 | |||
34 | asm volatile ("getcon " __SR ", %0\n\t" | ||
35 | : "=r" (sr)); | ||
36 | |||
37 | sr = (sr >> SR_ASID_SHIFT) & MMU_CONTEXT_ASID_MASK; | ||
38 | return (unsigned long) sr; | ||
39 | } | ||
40 | |||
41 | /* Set ASID into SR */ | ||
42 | static inline void set_asid(unsigned long asid) | ||
43 | { | ||
44 | unsigned long long sr, pc; | ||
45 | |||
46 | asm volatile ("getcon " __SR ", %0" : "=r" (sr)); | ||
47 | |||
48 | sr = (sr & SR_ASID_MASK) | (asid << SR_ASID_SHIFT); | ||
49 | |||
50 | /* | ||
51 | * It is possible that this function may be inlined and so to avoid | ||
52 | * the assembler reporting duplicate symbols we make use of the | ||
53 | * gas trick of generating symbols using numerics and forward | ||
54 | * reference. | ||
55 | */ | ||
56 | asm volatile ("movi 1, %1\n\t" | ||
57 | "shlli %1, 28, %1\n\t" | ||
58 | "or %0, %1, %1\n\t" | ||
59 | "putcon %1, " __SR "\n\t" | ||
60 | "putcon %0, " __SSR "\n\t" | ||
61 | "movi 1f, %1\n\t" | ||
62 | "ori %1, 1 , %1\n\t" | ||
63 | "putcon %1, " __SPC "\n\t" | ||
64 | "rte\n" | ||
65 | "1:\n\t" | ||
66 | : "=r" (sr), "=r" (pc) : "0" (sr)); | ||
67 | } | ||
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 */ | ||