1 /* 2 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> 3 * Copyright (C) 2012 Regents of the University of California 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * as published by the Free Software Foundation, version 2. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #ifndef _ASM_RISCV_TLBFLUSH_H 16 #define _ASM_RISCV_TLBFLUSH_H 17 18 #include <linux/mm_types.h> 19 20 /* 21 * Flush entire local TLB. 'sfence.vma' implicitly fences with the instruction 22 * cache as well, so a 'fence.i' is not necessary. 23 */ 24 static inline void local_flush_tlb_all(void) 25 { 26 __asm__ __volatile__ ("sfence.vma" : : : "memory"); 27 } 28 29 /* Flush one page from local TLB */ 30 static inline void local_flush_tlb_page(unsigned long addr) 31 { 32 __asm__ __volatile__ ("sfence.vma %0" : : "r" (addr) : "memory"); 33 } 34 35 #ifndef CONFIG_SMP 36 37 #define flush_tlb_all() local_flush_tlb_all() 38 #define flush_tlb_page(vma, addr) local_flush_tlb_page(addr) 39 #define flush_tlb_range(vma, start, end) local_flush_tlb_all() 40 41 #else /* CONFIG_SMP */ 42 43 #include <asm/sbi.h> 44 45 #define flush_tlb_all() sbi_remote_sfence_vma(0, 0, -1) 46 #define flush_tlb_page(vma, addr) flush_tlb_range(vma, addr, 0) 47 #define flush_tlb_range(vma, start, end) \ 48 sbi_remote_sfence_vma(0, start, (end) - (start)) 49 50 #endif /* CONFIG_SMP */ 51 52 /* Flush the TLB entries of the specified mm context */ 53 static inline void flush_tlb_mm(struct mm_struct *mm) 54 { 55 flush_tlb_all(); 56 } 57 58 /* Flush a range of kernel pages */ 59 static inline void flush_tlb_kernel_range(unsigned long start, 60 unsigned long end) 61 { 62 flush_tlb_all(); 63 } 64 65 #endif /* _ASM_RISCV_TLBFLUSH_H */ 66