| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1 | /* MN10300 MMU context allocation and management |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <asm/mmu_context.h> |
| 14 | #include <asm/tlbflush.h> |
| 15 | |
| 16 | /* |
| 17 | * list of the MMU contexts last allocated on each CPU |
| 18 | */ |
| 19 | unsigned long mmu_context_cache[NR_CPUS] = { |
| 20 | [0 ... NR_CPUS - 1] = MMU_CONTEXT_FIRST_VERSION * 2 - 1, |
| 21 | }; |
| 22 | |
| 23 | /* |
| 24 | * flush the specified TLB entry |
| 25 | */ |
| 26 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) |
| 27 | { |
| 28 | unsigned long pteu, cnx, flags; |
| 29 | |
| 30 | addr &= PAGE_MASK; |
| 31 | |
| 32 | /* make sure the context doesn't migrate and defend against |
| 33 | * interference from vmalloc'd regions */ |
| 34 | local_irq_save(flags); |
| 35 | |
| 36 | cnx = mm_context(vma->vm_mm); |
| 37 | |
| 38 | if (cnx != MMU_NO_CONTEXT) { |
| 39 | pteu = addr | (cnx & 0x000000ffUL); |
| 40 | IPTEU = pteu; |
| 41 | DPTEU = pteu; |
| 42 | if (IPTEL & xPTEL_V) |
| 43 | IPTEL = 0; |
| 44 | if (DPTEL & xPTEL_V) |
| 45 | DPTEL = 0; |
| 46 | } |
| 47 | |
| 48 | local_irq_restore(flags); |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * preemptively set a TLB entry |
| 53 | */ |
| 54 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
| 55 | { |
| 56 | unsigned long pteu, ptel, cnx, flags; |
| 57 | |
| 58 | addr &= PAGE_MASK; |
| 59 | ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2); |
| 60 | |
| 61 | /* make sure the context doesn't migrate and defend against |
| 62 | * interference from vmalloc'd regions */ |
| 63 | local_irq_save(flags); |
| 64 | |
| 65 | cnx = mm_context(vma->vm_mm); |
| 66 | |
| 67 | if (cnx != MMU_NO_CONTEXT) { |
| 68 | pteu = addr | (cnx & 0x000000ffUL); |
| 69 | if (!(pte_val(pte) & _PAGE_NX)) { |
| 70 | IPTEU = pteu; |
| 71 | if (IPTEL & xPTEL_V) |
| 72 | IPTEL = ptel; |
| 73 | } |
| 74 | DPTEU = pteu; |
| 75 | if (DPTEL & xPTEL_V) |
| 76 | DPTEL = ptel; |
| 77 | } |
| 78 | |
| 79 | local_irq_restore(flags); |
| 80 | } |