/* 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 #include #include #include /* * 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, }; /* * flush the specified TLB entry */ void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) { unsigned long pteu, cnx, flags; addr &= PAGE_MASK; /* make sure the context doesn't migrate and defend against * interference from vmalloc'd regions */ local_irq_save(flags); cnx = mm_context(vma->vm_mm); if (cnx != MMU_NO_CONTEXT) { pteu = addr | (cnx & 0x000000ffUL); IPTEU = pteu; DPTEU = pteu; if (IPTEL & xPTEL_V) IPTEL = 0; if (DPTEL & xPTEL_V) DPTEL = 0; } local_irq_restore(flags); } /* * preemptively set a TLB entry */ void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte) { unsigned long pteu, ptel, cnx, flags; 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 = mm_context(vma->vm_mm); if (cnx != MMU_NO_CONTEXT) { pteu = addr | (cnx & 0x000000ffUL); 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); }