diff options
Diffstat (limited to 'kernel/arch/mn10300/mm/mmu-context.c')
| -rw-r--r-- | kernel/arch/mn10300/mm/mmu-context.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/kernel/arch/mn10300/mm/mmu-context.c b/kernel/arch/mn10300/mm/mmu-context.c new file mode 100644 index 000000000..a4f7d3dcc --- /dev/null +++ b/kernel/arch/mn10300/mm/mmu-context.c @@ -0,0 +1,62 @@ +/* MN10300 MMU context allocation and management + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/sched.h> +#include <linux/mm.h> +#include <asm/mmu_context.h> +#include <asm/tlbflush.h> + +#ifdef CONFIG_MN10300_TLB_USE_PIDR +/* + * list of the MMU contexts last allocated on each CPU + */ +unsigned long mmu_context_cache[NR_CPUS] = { + [0 ... NR_CPUS - 1] = + MMU_CONTEXT_FIRST_VERSION * 2 - (1 - MMU_CONTEXT_TLBPID_LOCK_NR), +}; +#endif /* CONFIG_MN10300_TLB_USE_PIDR */ + +/* + * preemptively set a TLB entry + */ +void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) +{ + unsigned long pteu, ptel, cnx, flags; + pte_t pte = *ptep; + + addr &= PAGE_MASK; + ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2); + + /* make sure the context doesn't migrate and defend against + * interference from vmalloc'd regions */ + local_irq_save(flags); + + cnx = ~MMU_NO_CONTEXT; +#ifdef CONFIG_MN10300_TLB_USE_PIDR + cnx = mm_context(vma->vm_mm); +#endif + + if (cnx != MMU_NO_CONTEXT) { + pteu = addr; +#ifdef CONFIG_MN10300_TLB_USE_PIDR + pteu |= cnx & MMU_CONTEXT_TLBPID_MASK; +#endif + if (!(pte_val(pte) & _PAGE_NX)) { + IPTEU = pteu; + if (IPTEL & xPTEL_V) + IPTEL = ptel; + } + DPTEU = pteu; + if (DPTEL & xPTEL_V) + DPTEL = ptel; + } + + local_irq_restore(flags); +} |