diff options
Diffstat (limited to 'arch/powerpc/mm/mmu_context_32.c')
| -rw-r--r-- | arch/powerpc/mm/mmu_context_32.c | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/arch/powerpc/mm/mmu_context_32.c b/arch/powerpc/mm/mmu_context_32.c deleted file mode 100644 index cc32ba41d900..000000000000 --- a/arch/powerpc/mm/mmu_context_32.c +++ /dev/null | |||
| @@ -1,84 +0,0 @@ | |||
| 1 | /* | ||
| 2 | * This file contains the routines for handling the MMU on those | ||
| 3 | * PowerPC implementations where the MMU substantially follows the | ||
| 4 | * architecture specification. This includes the 6xx, 7xx, 7xxx, | ||
| 5 | * 8260, and POWER3 implementations but excludes the 8xx and 4xx. | ||
| 6 | * -- paulus | ||
| 7 | * | ||
| 8 | * Derived from arch/ppc/mm/init.c: | ||
| 9 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | ||
| 10 | * | ||
| 11 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | ||
| 12 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | ||
| 13 | * Copyright (C) 1996 Paul Mackerras | ||
| 14 | * | ||
| 15 | * Derived from "arch/i386/mm/init.c" | ||
| 16 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | ||
| 17 | * | ||
| 18 | * This program is free software; you can redistribute it and/or | ||
| 19 | * modify it under the terms of the GNU General Public License | ||
| 20 | * as published by the Free Software Foundation; either version | ||
| 21 | * 2 of the License, or (at your option) any later version. | ||
| 22 | * | ||
| 23 | */ | ||
| 24 | |||
| 25 | #include <linux/mm.h> | ||
| 26 | #include <linux/init.h> | ||
| 27 | |||
| 28 | #include <asm/mmu_context.h> | ||
| 29 | #include <asm/tlbflush.h> | ||
| 30 | |||
| 31 | unsigned long next_mmu_context; | ||
| 32 | unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1]; | ||
| 33 | #ifdef FEW_CONTEXTS | ||
| 34 | atomic_t nr_free_contexts; | ||
| 35 | struct mm_struct *context_mm[LAST_CONTEXT+1]; | ||
| 36 | void steal_context(void); | ||
| 37 | #endif /* FEW_CONTEXTS */ | ||
| 38 | |||
| 39 | /* | ||
| 40 | * Initialize the context management stuff. | ||
| 41 | */ | ||
| 42 | void __init | ||
| 43 | mmu_context_init(void) | ||
| 44 | { | ||
| 45 | /* | ||
| 46 | * Some processors have too few contexts to reserve one for | ||
| 47 | * init_mm, and require using context 0 for a normal task. | ||
| 48 | * Other processors reserve the use of context zero for the kernel. | ||
| 49 | * This code assumes FIRST_CONTEXT < 32. | ||
| 50 | */ | ||
| 51 | context_map[0] = (1 << FIRST_CONTEXT) - 1; | ||
| 52 | next_mmu_context = FIRST_CONTEXT; | ||
| 53 | #ifdef FEW_CONTEXTS | ||
| 54 | atomic_set(&nr_free_contexts, LAST_CONTEXT - FIRST_CONTEXT + 1); | ||
| 55 | #endif /* FEW_CONTEXTS */ | ||
| 56 | } | ||
| 57 | |||
| 58 | #ifdef FEW_CONTEXTS | ||
| 59 | /* | ||
| 60 | * Steal a context from a task that has one at the moment. | ||
| 61 | * This is only used on 8xx and 4xx and we presently assume that | ||
| 62 | * they don't do SMP. If they do then this will have to check | ||
| 63 | * whether the MM we steal is in use. | ||
| 64 | * We also assume that this is only used on systems that don't | ||
| 65 | * use an MMU hash table - this is true for 8xx and 4xx. | ||
| 66 | * This isn't an LRU system, it just frees up each context in | ||
| 67 | * turn (sort-of pseudo-random replacement :). This would be the | ||
| 68 | * place to implement an LRU scheme if anyone was motivated to do it. | ||
| 69 | * -- paulus | ||
| 70 | */ | ||
| 71 | void | ||
| 72 | steal_context(void) | ||
| 73 | { | ||
| 74 | struct mm_struct *mm; | ||
| 75 | |||
| 76 | /* free up context `next_mmu_context' */ | ||
| 77 | /* if we shouldn't free context 0, don't... */ | ||
| 78 | if (next_mmu_context < FIRST_CONTEXT) | ||
| 79 | next_mmu_context = FIRST_CONTEXT; | ||
| 80 | mm = context_mm[next_mmu_context]; | ||
| 81 | flush_tlb_mm(mm); | ||
| 82 | destroy_context(mm); | ||
| 83 | } | ||
| 84 | #endif /* FEW_CONTEXTS */ | ||