1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Hexagon Virtual Machine TLB functions 4 * 5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 6 */ 7 8 /* 9 * The Hexagon Virtual Machine conceals the real workings of 10 * the TLB, but there are one or two functions that need to 11 * be instantiated for it, differently from a native build. 12 */ 13 #include <linux/mm.h> 14 #include <linux/sched.h> 15 #include <asm/page.h> 16 #include <asm/hexagon_vm.h> 17 18 /* 19 * Initial VM implementation has only one map active at a time, with 20 * TLB purgings on changes. So either we're nuking the current map, 21 * or it's a no-op. This operation is messy on true SMPs where other 22 * processors must be induced to flush the copies in their local TLBs, 23 * but Hexagon thread-based virtual processors share the same MMU. 24 */ 25 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 26 unsigned long end) 27 { 28 struct mm_struct *mm = vma->vm_mm; 29 30 if (mm->context.ptbase == current->active_mm->context.ptbase) 31 __vmclrmap((void *)start, end - start); 32 } 33 34 /* 35 * Flush a page from the kernel virtual map - used by highmem 36 */ 37 void flush_tlb_one(unsigned long vaddr) 38 { 39 __vmclrmap((void *)vaddr, PAGE_SIZE); 40 } 41 42 /* 43 * Flush all TLBs across all CPUs, virtual or real. 44 * A single Hexagon core has 6 thread contexts but 45 * only one TLB. 46 */ 47 void tlb_flush_all(void) 48 { 49 /* should probably use that fixaddr end or whateve label */ 50 __vmclrmap(0, 0xffff0000); 51 } 52 53 /* 54 * Flush TLB entries associated with a given mm_struct mapping. 55 */ 56 void flush_tlb_mm(struct mm_struct *mm) 57 { 58 /* Current Virtual Machine has only one map active at a time */ 59 if (current->active_mm->context.ptbase == mm->context.ptbase) 60 tlb_flush_all(); 61 } 62 63 /* 64 * Flush TLB state associated with a page of a vma. 65 */ 66 void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr) 67 { 68 struct mm_struct *mm = vma->vm_mm; 69 70 if (mm->context.ptbase == current->active_mm->context.ptbase) 71 __vmclrmap((void *)vaddr, PAGE_SIZE); 72 } 73 74 /* 75 * Flush TLB entries associated with a kernel address range. 76 * Like flush range, but without the check on the vma->vm_mm. 77 */ 78 void flush_tlb_kernel_range(unsigned long start, unsigned long end) 79 { 80 __vmclrmap((void *)start, end - start); 81 } 82