1 #ifndef __ASM_ARM_SYSTEM_H 2 #define __ASM_ARM_SYSTEM_H 3 4 #ifdef CONFIG_ARM64 5 6 /* 7 * SCTLR_EL1/SCTLR_EL2/SCTLR_EL3 bits definitions 8 */ 9 #define CR_M (1 << 0) /* MMU enable */ 10 #define CR_A (1 << 1) /* Alignment abort enable */ 11 #define CR_C (1 << 2) /* Dcache enable */ 12 #define CR_SA (1 << 3) /* Stack Alignment Check Enable */ 13 #define CR_I (1 << 12) /* Icache enable */ 14 #define CR_WXN (1 << 19) /* Write Permision Imply XN */ 15 #define CR_EE (1 << 25) /* Exception (Big) Endian */ 16 17 #define PGTABLE_SIZE (0x10000) 18 19 #ifndef __ASSEMBLY__ 20 21 #define isb() \ 22 ({asm volatile( \ 23 "isb" : : : "memory"); \ 24 }) 25 26 #define wfi() \ 27 ({asm volatile( \ 28 "wfi" : : : "memory"); \ 29 }) 30 31 static inline unsigned int current_el(void) 32 { 33 unsigned int el; 34 asm volatile("mrs %0, CurrentEL" : "=r" (el) : : "cc"); 35 return el >> 2; 36 } 37 38 static inline unsigned int get_sctlr(void) 39 { 40 unsigned int el, val; 41 42 el = current_el(); 43 if (el == 1) 44 asm volatile("mrs %0, sctlr_el1" : "=r" (val) : : "cc"); 45 else if (el == 2) 46 asm volatile("mrs %0, sctlr_el2" : "=r" (val) : : "cc"); 47 else 48 asm volatile("mrs %0, sctlr_el3" : "=r" (val) : : "cc"); 49 50 return val; 51 } 52 53 static inline void set_sctlr(unsigned int val) 54 { 55 unsigned int el; 56 57 el = current_el(); 58 if (el == 1) 59 asm volatile("msr sctlr_el1, %0" : : "r" (val) : "cc"); 60 else if (el == 2) 61 asm volatile("msr sctlr_el2, %0" : : "r" (val) : "cc"); 62 else 63 asm volatile("msr sctlr_el3, %0" : : "r" (val) : "cc"); 64 65 asm volatile("isb"); 66 } 67 68 void __asm_flush_dcache_all(void); 69 void __asm_invalidate_dcache_all(void); 70 void __asm_flush_dcache_range(u64 start, u64 end); 71 void __asm_invalidate_tlb_all(void); 72 void __asm_invalidate_icache_all(void); 73 74 void armv8_switch_to_el2(void); 75 void armv8_switch_to_el1(void); 76 void gic_init(void); 77 void gic_send_sgi(unsigned long sgino); 78 void wait_for_wakeup(void); 79 void smp_kick_all_cpus(void); 80 81 #endif /* __ASSEMBLY__ */ 82 83 #else /* CONFIG_ARM64 */ 84 85 #ifdef __KERNEL__ 86 87 #define CPU_ARCH_UNKNOWN 0 88 #define CPU_ARCH_ARMv3 1 89 #define CPU_ARCH_ARMv4 2 90 #define CPU_ARCH_ARMv4T 3 91 #define CPU_ARCH_ARMv5 4 92 #define CPU_ARCH_ARMv5T 5 93 #define CPU_ARCH_ARMv5TE 6 94 #define CPU_ARCH_ARMv5TEJ 7 95 #define CPU_ARCH_ARMv6 8 96 #define CPU_ARCH_ARMv7 9 97 98 /* 99 * CR1 bits (CP#15 CR1) 100 */ 101 #define CR_M (1 << 0) /* MMU enable */ 102 #define CR_A (1 << 1) /* Alignment abort enable */ 103 #define CR_C (1 << 2) /* Dcache enable */ 104 #define CR_W (1 << 3) /* Write buffer enable */ 105 #define CR_P (1 << 4) /* 32-bit exception handler */ 106 #define CR_D (1 << 5) /* 32-bit data address range */ 107 #define CR_L (1 << 6) /* Implementation defined */ 108 #define CR_B (1 << 7) /* Big endian */ 109 #define CR_S (1 << 8) /* System MMU protection */ 110 #define CR_R (1 << 9) /* ROM MMU protection */ 111 #define CR_F (1 << 10) /* Implementation defined */ 112 #define CR_Z (1 << 11) /* Implementation defined */ 113 #define CR_I (1 << 12) /* Icache enable */ 114 #define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */ 115 #define CR_RR (1 << 14) /* Round Robin cache replacement */ 116 #define CR_L4 (1 << 15) /* LDR pc can set T bit */ 117 #define CR_DT (1 << 16) 118 #define CR_IT (1 << 18) 119 #define CR_ST (1 << 19) 120 #define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */ 121 #define CR_U (1 << 22) /* Unaligned access operation */ 122 #define CR_XP (1 << 23) /* Extended page tables */ 123 #define CR_VE (1 << 24) /* Vectored interrupts */ 124 #define CR_EE (1 << 25) /* Exception (Big) Endian */ 125 #define CR_TRE (1 << 28) /* TEX remap enable */ 126 #define CR_AFE (1 << 29) /* Access flag enable */ 127 #define CR_TE (1 << 30) /* Thumb exception enable */ 128 129 #define PGTABLE_SIZE (4096 * 4) 130 131 /* 132 * This is used to ensure the compiler did actually allocate the register we 133 * asked it for some inline assembly sequences. Apparently we can't trust 134 * the compiler from one version to another so a bit of paranoia won't hurt. 135 * This string is meant to be concatenated with the inline asm string and 136 * will cause compilation to stop on mismatch. 137 * (for details, see gcc PR 15089) 138 */ 139 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t" 140 141 #ifndef __ASSEMBLY__ 142 143 #define isb() __asm__ __volatile__ ("" : : : "memory") 144 145 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t"); 146 147 #ifdef __ARM_ARCH_7A__ 148 #define wfi() __asm__ __volatile__ ("wfi" : : : "memory") 149 #else 150 #define wfi() 151 #endif 152 153 static inline unsigned int get_cr(void) 154 { 155 unsigned int val; 156 asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc"); 157 return val; 158 } 159 160 static inline void set_cr(unsigned int val) 161 { 162 asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR" 163 : : "r" (val) : "cc"); 164 isb(); 165 } 166 167 static inline unsigned int get_dacr(void) 168 { 169 unsigned int val; 170 asm("mrc p15, 0, %0, c3, c0, 0 @ get DACR" : "=r" (val) : : "cc"); 171 return val; 172 } 173 174 static inline void set_dacr(unsigned int val) 175 { 176 asm volatile("mcr p15, 0, %0, c3, c0, 0 @ set DACR" 177 : : "r" (val) : "cc"); 178 isb(); 179 } 180 181 /* options available for data cache on each page */ 182 enum dcache_option { 183 DCACHE_OFF = 0x12, 184 DCACHE_WRITETHROUGH = 0x1a, 185 DCACHE_WRITEBACK = 0x1e, 186 }; 187 188 /* Size of an MMU section */ 189 enum { 190 MMU_SECTION_SHIFT = 20, 191 MMU_SECTION_SIZE = 1 << MMU_SECTION_SHIFT, 192 }; 193 194 /** 195 * Change the cache settings for a region. 196 * 197 * \param start start address of memory region to change 198 * \param size size of memory region to change 199 * \param option dcache option to select 200 */ 201 void mmu_set_region_dcache_behaviour(u32 start, int size, 202 enum dcache_option option); 203 204 /** 205 * Register an update to the page tables, and flush the TLB 206 * 207 * \param start start address of update in page table 208 * \param stop stop address of update in page table 209 */ 210 void mmu_page_table_flush(unsigned long start, unsigned long stop); 211 212 #endif /* __ASSEMBLY__ */ 213 214 #define arch_align_stack(x) (x) 215 216 #endif /* __KERNEL__ */ 217 218 #endif /* CONFIG_ARM64 */ 219 220 #endif 221