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 <linux/sched.h> 28 #include <asm/page.h> 29 #include <asm/hexagon_vm.h> 30 31 /* 32 * Initial VM implementation has only one map active at a time, with 33 * TLB purgings on changes. So either we're nuking the current map, 34 * or it's a no-op. This operation is messy on true SMPs where other 35 * processors must be induced to flush the copies in their local TLBs, 36 * but Hexagon thread-based virtual processors share the same MMU. 37 */ 38 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 39 unsigned long end) 40 { 41 struct mm_struct *mm = vma->vm_mm; 42 43 if (mm->context.ptbase == current->active_mm->context.ptbase) 44 __vmclrmap((void *)start, end - start); 45 } 46 47 /* 48 * Flush a page from the kernel virtual map - used by highmem 49 */ 50 void flush_tlb_one(unsigned long vaddr) 51 { 52 __vmclrmap((void *)vaddr, PAGE_SIZE); 53 } 54 55 /* 56 * Flush all TLBs across all CPUs, virtual or real. 57 * A single Hexagon core has 6 thread contexts but 58 * only one TLB. 59 */ 60 void tlb_flush_all(void) 61 { 62 /* should probably use that fixaddr end or whateve label */ 63 __vmclrmap(0, 0xffff0000); 64 } 65 66 /* 67 * Flush TLB entries associated with a given mm_struct mapping. 68 */ 69 void flush_tlb_mm(struct mm_struct *mm) 70 { 71 /* Current Virtual Machine has only one map active at a time */ 72 if (current->active_mm->context.ptbase == mm->context.ptbase) 73 tlb_flush_all(); 74 } 75 76 /* 77 * Flush TLB state associated with a page of a vma. 78 */ 79 void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr) 80 { 81 struct mm_struct *mm = vma->vm_mm; 82 83 if (mm->context.ptbase == current->active_mm->context.ptbase) 84 __vmclrmap((void *)vaddr, PAGE_SIZE); 85 } 86 87 /* 88 * Flush TLB entries associated with a kernel address range. 89 * Like flush range, but without the check on the vma->vm_mm. 90 */ 91 void flush_tlb_kernel_range(unsigned long start, unsigned long end) 92 { 93 __vmclrmap((void *)start, end - start); 94 } 95