1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 3 #ifndef SELFTEST_KVM_PROCESSOR_H 4 #define SELFTEST_KVM_PROCESSOR_H 5 6 #ifndef __ASSEMBLER__ 7 #include "ucall_common.h" 8 9 #else 10 /* general registers */ 11 #define zero $r0 12 #define ra $r1 13 #define tp $r2 14 #define sp $r3 15 #define a0 $r4 16 #define a1 $r5 17 #define a2 $r6 18 #define a3 $r7 19 #define a4 $r8 20 #define a5 $r9 21 #define a6 $r10 22 #define a7 $r11 23 #define t0 $r12 24 #define t1 $r13 25 #define t2 $r14 26 #define t3 $r15 27 #define t4 $r16 28 #define t5 $r17 29 #define t6 $r18 30 #define t7 $r19 31 #define t8 $r20 32 #define u0 $r21 33 #define fp $r22 34 #define s0 $r23 35 #define s1 $r24 36 #define s2 $r25 37 #define s3 $r26 38 #define s4 $r27 39 #define s5 $r28 40 #define s6 $r29 41 #define s7 $r30 42 #define s8 $r31 43 #endif 44 45 /* 46 * LoongArch page table entry definition 47 * Original header file arch/loongarch/include/asm/loongarch.h 48 */ 49 #define _PAGE_VALID_SHIFT 0 50 #define _PAGE_DIRTY_SHIFT 1 51 #define _PAGE_PLV_SHIFT 2 /* 2~3, two bits */ 52 #define PLV_KERN 0 53 #define PLV_USER 3 54 #define PLV_MASK 0x3 55 #define _CACHE_SHIFT 4 /* 4~5, two bits */ 56 #define _PAGE_PRESENT_SHIFT 7 57 #define _PAGE_WRITE_SHIFT 8 58 59 #define _PAGE_VALID BIT_ULL(_PAGE_VALID_SHIFT) 60 #define _PAGE_PRESENT BIT_ULL(_PAGE_PRESENT_SHIFT) 61 #define _PAGE_WRITE BIT_ULL(_PAGE_WRITE_SHIFT) 62 #define _PAGE_DIRTY BIT_ULL(_PAGE_DIRTY_SHIFT) 63 #define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT) 64 #define __READABLE (_PAGE_VALID) 65 #define __WRITEABLE (_PAGE_DIRTY | _PAGE_WRITE) 66 /* Coherent Cached */ 67 #define _CACHE_CC BIT_ULL(_CACHE_SHIFT) 68 #define PS_4K 0x0000000c 69 #define PS_16K 0x0000000e 70 #define PS_64K 0x00000010 71 #define PS_DEFAULT_SIZE PS_16K 72 73 /* LoongArch Basic CSR registers */ 74 #define LOONGARCH_CSR_CRMD 0x0 /* Current mode info */ 75 #define CSR_CRMD_PG_SHIFT 4 76 #define CSR_CRMD_PG BIT_ULL(CSR_CRMD_PG_SHIFT) 77 #define CSR_CRMD_IE_SHIFT 2 78 #define CSR_CRMD_IE BIT_ULL(CSR_CRMD_IE_SHIFT) 79 #define CSR_CRMD_PLV_SHIFT 0 80 #define CSR_CRMD_PLV_WIDTH 2 81 #define CSR_CRMD_PLV (0x3UL << CSR_CRMD_PLV_SHIFT) 82 #define PLV_MASK 0x3 83 #define LOONGARCH_CSR_PRMD 0x1 84 #define LOONGARCH_CSR_EUEN 0x2 85 #define LOONGARCH_CSR_ECFG 0x4 86 #define LOONGARCH_CSR_ESTAT 0x5 /* Exception status */ 87 #define LOONGARCH_CSR_ERA 0x6 /* ERA */ 88 #define LOONGARCH_CSR_BADV 0x7 /* Bad virtual address */ 89 #define LOONGARCH_CSR_EENTRY 0xc 90 #define LOONGARCH_CSR_TLBIDX 0x10 /* TLB Index, EHINV, PageSize */ 91 #define CSR_TLBIDX_PS_SHIFT 24 92 #define CSR_TLBIDX_PS_WIDTH 6 93 #define CSR_TLBIDX_PS (0x3fUL << CSR_TLBIDX_PS_SHIFT) 94 #define CSR_TLBIDX_SIZEM 0x3f000000 95 #define CSR_TLBIDX_SIZE CSR_TLBIDX_PS_SHIFT 96 #define LOONGARCH_CSR_ASID 0x18 /* ASID */ 97 #define LOONGARCH_CSR_PGDL 0x19 98 #define LOONGARCH_CSR_PGDH 0x1a 99 /* Page table base */ 100 #define LOONGARCH_CSR_PGD 0x1b 101 #define LOONGARCH_CSR_PWCTL0 0x1c 102 #define LOONGARCH_CSR_PWCTL1 0x1d 103 #define LOONGARCH_CSR_STLBPGSIZE 0x1e 104 #define LOONGARCH_CSR_CPUID 0x20 105 #define LOONGARCH_CSR_KS0 0x30 106 #define LOONGARCH_CSR_KS1 0x31 107 #define LOONGARCH_CSR_TMID 0x40 108 #define LOONGARCH_CSR_TCFG 0x41 109 /* TLB refill exception entry */ 110 #define LOONGARCH_CSR_TLBRENTRY 0x88 111 #define LOONGARCH_CSR_TLBRSAVE 0x8b 112 #define LOONGARCH_CSR_TLBREHI 0x8e 113 #define CSR_TLBREHI_PS_SHIFT 0 114 #define CSR_TLBREHI_PS (0x3fUL << CSR_TLBREHI_PS_SHIFT) 115 116 #define csr_read(csr) \ 117 ({ \ 118 register unsigned long __v; \ 119 __asm__ __volatile__( \ 120 "csrrd %[val], %[reg]\n\t" \ 121 : [val] "=r" (__v) \ 122 : [reg] "i" (csr) \ 123 : "memory"); \ 124 __v; \ 125 }) 126 127 #define csr_write(v, csr) \ 128 ({ \ 129 register unsigned long __v = v; \ 130 __asm__ __volatile__ ( \ 131 "csrwr %[val], %[reg]\n\t" \ 132 : [val] "+r" (__v) \ 133 : [reg] "i" (csr) \ 134 : "memory"); \ 135 __v; \ 136 }) 137 138 #define EXREGS_GPRS (32) 139 140 #ifndef __ASSEMBLER__ 141 void handle_tlb_refill(void); 142 void handle_exception(void); 143 144 struct ex_regs { 145 unsigned long regs[EXREGS_GPRS]; 146 unsigned long pc; 147 unsigned long estat; 148 unsigned long badv; 149 unsigned long prmd; 150 }; 151 152 #define PC_OFFSET_EXREGS offsetof(struct ex_regs, pc) 153 #define ESTAT_OFFSET_EXREGS offsetof(struct ex_regs, estat) 154 #define BADV_OFFSET_EXREGS offsetof(struct ex_regs, badv) 155 #define PRMD_OFFSET_EXREGS offsetof(struct ex_regs, prmd) 156 #define EXREGS_SIZE sizeof(struct ex_regs) 157 158 static inline void cpu_relax(void) 159 { 160 asm volatile("nop" ::: "memory"); 161 } 162 163 static inline void local_irq_enable(void) 164 { 165 unsigned int flags = CSR_CRMD_IE; 166 register unsigned int mask asm("$t0") = CSR_CRMD_IE; 167 168 __asm__ __volatile__( 169 "csrxchg %[val], %[mask], %[reg]\n\t" 170 : [val] "+r" (flags) 171 : [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD) 172 : "memory"); 173 } 174 175 static inline void local_irq_disable(void) 176 { 177 unsigned int flags = 0; 178 register unsigned int mask asm("$t0") = CSR_CRMD_IE; 179 180 __asm__ __volatile__( 181 "csrxchg %[val], %[mask], %[reg]\n\t" 182 : [val] "+r" (flags) 183 : [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD) 184 : "memory"); 185 } 186 #else 187 #define PC_OFFSET_EXREGS ((EXREGS_GPRS + 0) * 8) 188 #define ESTAT_OFFSET_EXREGS ((EXREGS_GPRS + 1) * 8) 189 #define BADV_OFFSET_EXREGS ((EXREGS_GPRS + 2) * 8) 190 #define PRMD_OFFSET_EXREGS ((EXREGS_GPRS + 3) * 8) 191 #define EXREGS_SIZE ((EXREGS_GPRS + 4) * 8) 192 #endif 193 194 #endif /* SELFTEST_KVM_PROCESSOR_H */ 195