1 /* 2 * Hexagon Virtual Machine TLB functions 3 * 4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 and 8 * only version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA. 19 */ 20 21 /* 22 * The Hexagon Virtual Machine conceals the real workings of 23 * the TLB, but there are one or two functions that need to 24 * be instantiated for it, differently from a native build. 25 */ 26 #include <linux/mm.h> 27 #include <asm/page.h> 28 #include <asm/hexagon_vm.h> 29 30 /* 31 * Initial VM implementation has only one map active at a time, with 32 * TLB purgings on changes. So either we're nuking the current map, 33 * or it's a no-op. This operation is messy on true SMPs where other 34 * processors must be induced to flush the copies in their local TLBs, 35 * but Hexagon thread-based virtual processors share the same MMU. 36 */ 37 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 38 unsigned long end) 39 { 40 struct mm_struct *mm = vma->vm_mm; 41 42 if (mm->context.ptbase == current->active_mm->context.ptbase) 43 __vmclrmap((void *)start, end - start); 44 } 45 46 /* 47 * Flush a page from the kernel virtual map - used by highmem 48 */ 49 void flush_tlb_one(unsigned long vaddr) 50 { 51 __vmclrmap((void *)vaddr, PAGE_SIZE); 52 } 53 54 /* 55 * Flush all TLBs across all CPUs, virtual or real. 56 * A single Hexagon core has 6 thread contexts but 57 * only one TLB. 58 */ 59 void tlb_flush_all(void) 60 { 61 /* should probably use that fixaddr end or whateve label */ 62 __vmclrmap(0, 0xffff0000); 63 } 64 65 /* 66 * Flush TLB entries associated with a given mm_struct mapping. 67 */ 68 void flush_tlb_mm(struct mm_struct *mm) 69 { 70 /* Current Virtual Machine has only one map active at a time */ 71 if (current->active_mm->context.ptbase == mm->context.ptbase) 72 tlb_flush_all(); 73 } 74 75 /* 76 * Flush TLB state associated with a page of a vma. 77 */ 78 void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr) 79 { 80 struct mm_struct *mm = vma->vm_mm; 81 82 if (mm->context.ptbase == current->active_mm->context.ptbase) 83 __vmclrmap((void *)vaddr, PAGE_SIZE); 84 } 85 86 /* 87 * Flush TLB entries associated with a kernel address range. 88 * Like flush range, but without the check on the vma->vm_mm. 89 */ 90 void flush_tlb_kernel_range(unsigned long start, unsigned long end) 91 { 92 __vmclrmap((void *)start, end - start); 93 } 94