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 #include <asm/tlbflush.h> 18 19 /* 20 * Initial VM implementation has only one map active at a time, with 21 * TLB purgings on changes. So either we're nuking the current map, 22 * or it's a no-op. This operation is messy on true SMPs where other 23 * processors must be induced to flush the copies in their local TLBs, 24 * but Hexagon thread-based virtual processors share the same MMU. 25 */ 26 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 27 unsigned long end) 28 { 29 struct mm_struct *mm = vma->vm_mm; 30 31 if (mm->context.ptbase == current->active_mm->context.ptbase) 32 __vmclrmap((void *)start, end - start); 33 } 34 35 /* 36 * Flush a page from the kernel virtual map - used by highmem 37 */ 38 void flush_tlb_one(unsigned long vaddr) 39 { 40 __vmclrmap((void *)vaddr, PAGE_SIZE); 41 } 42 43 /* 44 * Flush all TLBs across all CPUs, virtual or real. 45 * A single Hexagon core has 6 thread contexts but 46 * only one TLB. 47 */ 48 void tlb_flush_all(void) 49 { 50 /* should probably use that fixaddr end or whateve label */ 51 __vmclrmap(0, 0xffff0000); 52 } 53 54 /* 55 * Flush TLB entries associated with a given mm_struct mapping. 56 */ 57 void flush_tlb_mm(struct mm_struct *mm) 58 { 59 /* Current Virtual Machine has only one map active at a time */ 60 if (current->active_mm->context.ptbase == mm->context.ptbase) 61 tlb_flush_all(); 62 } 63 64 /* 65 * Flush TLB state associated with a page of a vma. 66 */ 67 void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr) 68 { 69 struct mm_struct *mm = vma->vm_mm; 70 71 if (mm->context.ptbase == current->active_mm->context.ptbase) 72 __vmclrmap((void *)vaddr, PAGE_SIZE); 73 } 74 75 /* 76 * Flush TLB entries associated with a kernel address range. 77 * Like flush range, but without the check on the vma->vm_mm. 78 */ 79 void flush_tlb_kernel_range(unsigned long start, unsigned long end) 80 { 81 __vmclrmap((void *)start, end - start); 82 } 83