1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 */ 5 6 #ifndef _ASM_ARC_MMU_H 7 #define _ASM_ARC_MMU_H 8 9 #ifndef __ASSEMBLY__ 10 #include <linux/threads.h> /* NR_CPUS */ 11 #endif 12 13 /* MMU Management regs */ 14 #define ARC_REG_MMU_BCR 0x06f 15 16 #ifdef CONFIG_ARC_MMU_V3 17 #define ARC_REG_TLBPD0 0x405 18 #define ARC_REG_TLBPD1 0x406 19 #define ARC_REG_TLBPD1HI 0 /* Dummy: allows code sharing with ARC700 */ 20 #define ARC_REG_TLBINDEX 0x407 21 #define ARC_REG_TLBCOMMAND 0x408 22 #define ARC_REG_PID 0x409 23 #define ARC_REG_SCRATCH_DATA0 0x418 24 #else 25 #define ARC_REG_TLBPD0 0x460 26 #define ARC_REG_TLBPD1 0x461 27 #define ARC_REG_TLBPD1HI 0x463 28 #define ARC_REG_TLBINDEX 0x464 29 #define ARC_REG_TLBCOMMAND 0x465 30 #define ARC_REG_PID 0x468 31 #define ARC_REG_SCRATCH_DATA0 0x46c 32 #endif 33 34 /* Bits in MMU PID register */ 35 #define __TLB_ENABLE (1 << 31) 36 #define __PROG_ENABLE (1 << 30) 37 #define MMU_ENABLE (__TLB_ENABLE | __PROG_ENABLE) 38 39 /* Error code if probe fails */ 40 #define TLB_LKUP_ERR 0x80000000 41 42 #ifdef CONFIG_ARC_MMU_V3 43 #define TLB_DUP_ERR (TLB_LKUP_ERR | 0x00000001) 44 #else 45 #define TLB_DUP_ERR (TLB_LKUP_ERR | 0x40000000) 46 #endif 47 48 /* TLB Commands */ 49 #define TLBWrite 0x1 50 #define TLBRead 0x2 51 #define TLBGetIndex 0x3 52 #define TLBProbe 0x4 53 #define TLBWriteNI 0x5 /* write JTLB without inv uTLBs */ 54 #define TLBIVUTLB 0x6 /* explicitly inv uTLBs */ 55 56 #ifdef CONFIG_ARC_MMU_V4 57 #define TLBInsertEntry 0x7 58 #define TLBDeleteEntry 0x8 59 #endif 60 61 #ifndef __ASSEMBLY__ 62 63 typedef struct { 64 unsigned long asid[NR_CPUS]; /* 8 bit MMU PID + Generation cycle */ 65 } mm_context_t; 66 67 #ifdef CONFIG_ARC_DBG_TLB_PARANOIA 68 void tlb_paranoid_check(unsigned int mm_asid, unsigned long address); 69 #else 70 #define tlb_paranoid_check(a, b) 71 #endif 72 73 void arc_mmu_init(void); 74 extern char *arc_mmu_mumbojumbo(int cpu_id, char *buf, int len); 75 void read_decode_mmu_bcr(void); 76 77 static inline int is_pae40_enabled(void) 78 { 79 return IS_ENABLED(CONFIG_ARC_HAS_PAE40); 80 } 81 82 extern int pae40_exist_but_not_enab(void); 83 84 #endif /* !__ASSEMBLY__ */ 85 86 #endif 87