diff options
Diffstat (limited to 'arch/cris/arch-v10/mm/tlb.c')
| -rw-r--r-- | arch/cris/arch-v10/mm/tlb.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/arch/cris/arch-v10/mm/tlb.c b/arch/cris/arch-v10/mm/tlb.c deleted file mode 100644 index 7f1f752f2445..000000000000 --- a/arch/cris/arch-v10/mm/tlb.c +++ /dev/null @@ -1,179 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/arch/cris/arch-v10/mm/tlb.c - * - * Low level TLB handling - * - * - * Copyright (C) 2000-2007 Axis Communications AB - * - * Authors: Bjorn Wesen (bjornw@axis.com) - * - */ - -#include <linux/mm_types.h> - -#include <asm/tlb.h> -#include <asm/mmu_context.h> -#include <arch/svinto.h> - -#define D(x) - -/* The TLB can host up to 64 different mm contexts at the same time. - * The running context is R_MMU_CONTEXT, and each TLB entry contains a - * page_id that has to match to give a hit. In page_id_map, we keep track - * of which mm's we have assigned which page_id's, so that we know when - * to invalidate TLB entries. - * - * The last page_id is never running - it is used as an invalid page_id - * so we can make TLB entries that will never match. - * - * Notice that we need to make the flushes atomic, otherwise an interrupt - * handler that uses vmalloced memory might cause a TLB load in the middle - * of a flush causing. - */ - -/* invalidate all TLB entries */ - -void -flush_tlb_all(void) -{ - int i; - unsigned long flags; - - /* the vpn of i & 0xf is so we dont write similar TLB entries - * in the same 4-way entry group. details... - */ - - local_irq_save(flags); - for(i = 0; i < NUM_TLB_ENTRIES; i++) { - *R_TLB_SELECT = ( IO_FIELD(R_TLB_SELECT, index, i) ); - *R_TLB_HI = ( IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) | - IO_FIELD(R_TLB_HI, vpn, i & 0xf ) ); - - *R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) | - IO_STATE(R_TLB_LO, valid, no ) | - IO_STATE(R_TLB_LO, kernel,no ) | - IO_STATE(R_TLB_LO, we, no ) | - IO_FIELD(R_TLB_LO, pfn, 0 ) ); - } - local_irq_restore(flags); - D(printk("tlb: flushed all\n")); -} - -/* invalidate the selected mm context only */ - -void -flush_tlb_mm(struct mm_struct *mm) -{ - int i; - int page_id = mm->context.page_id; - unsigned long flags; - - D(printk("tlb: flush mm context %d (%p)\n", page_id, mm)); - - if(page_id == NO_CONTEXT) - return; - - /* mark the TLB entries that match the page_id as invalid. - * here we could also check the _PAGE_GLOBAL bit and NOT flush - * global pages. is it worth the extra I/O ? - */ - - local_irq_save(flags); - for(i = 0; i < NUM_TLB_ENTRIES; i++) { - *R_TLB_SELECT = IO_FIELD(R_TLB_SELECT, index, i); - if (IO_EXTRACT(R_TLB_HI, page_id, *R_TLB_HI) == page_id) { - *R_TLB_HI = ( IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) | - IO_FIELD(R_TLB_HI, vpn, i & 0xf ) ); - - *R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) | - IO_STATE(R_TLB_LO, valid, no ) | - IO_STATE(R_TLB_LO, kernel,no ) | - IO_STATE(R_TLB_LO, we, no ) | - IO_FIELD(R_TLB_LO, pfn, 0 ) ); - } - } - local_irq_restore(flags); -} - -/* invalidate a single page */ - -void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) -{ - struct mm_struct *mm = vma->vm_mm; - int page_id = mm->context.page_id; - int i; - unsigned long flags; - - D(printk("tlb: flush page %p in context %d (%p)\n", addr, page_id, mm)); - - if(page_id == NO_CONTEXT) - return; - - addr &= PAGE_MASK; /* perhaps not necessary */ - - /* invalidate those TLB entries that match both the mm context - * and the virtual address requested - */ - - local_irq_save(flags); - for(i = 0; i < NUM_TLB_ENTRIES; i++) { - unsigned long tlb_hi; - *R_TLB_SELECT = IO_FIELD(R_TLB_SELECT, index, i); - tlb_hi = *R_TLB_HI; - if (IO_EXTRACT(R_TLB_HI, page_id, tlb_hi) == page_id && - (tlb_hi & PAGE_MASK) == addr) { - *R_TLB_HI = IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) | - addr; /* same addr as before works. */ - - *R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) | - IO_STATE(R_TLB_LO, valid, no ) | - IO_STATE(R_TLB_LO, kernel,no ) | - IO_STATE(R_TLB_LO, we, no ) | - IO_FIELD(R_TLB_LO, pfn, 0 ) ); - } - } - local_irq_restore(flags); -} - -/* - * Initialize the context related info for a new mm_struct - * instance. - */ - -int -init_new_context(struct task_struct *tsk, struct mm_struct *mm) -{ - mm->context.page_id = NO_CONTEXT; - return 0; -} - -/* called in schedule() just before actually doing the switch_to */ - -void switch_mm(struct mm_struct *prev, struct mm_struct *next, - struct task_struct *tsk) -{ - if (prev != next) { - /* make sure we have a context */ - get_mmu_context(next); - - /* remember the pgd for the fault handlers - * this is similar to the pgd register in some other CPU's. - * we need our own copy of it because current and active_mm - * might be invalid at points where we still need to derefer - * the pgd. - */ - - per_cpu(current_pgd, smp_processor_id()) = next->pgd; - - /* switch context in the MMU */ - - D(printk(KERN_DEBUG "switching mmu_context to %d (%p)\n", - next->context, next)); - - *R_MMU_CONTEXT = IO_FIELD(R_MMU_CONTEXT, - page_id, next->context.page_id); - } -} - |