1 /* 2 * include/asm/processor.h 3 * 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 5 */ 6 7 #ifndef __ASM_SPARC64_PROCESSOR_H 8 #define __ASM_SPARC64_PROCESSOR_H 9 10 /* 11 * Sparc64 implementation of macro that returns current 12 * instruction pointer ("program counter"). 13 */ 14 #define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; }) 15 16 #include <asm/asi.h> 17 #include <asm/pstate.h> 18 #include <asm/ptrace.h> 19 #include <asm/page.h> 20 21 /* The sparc has no problems with write protection */ 22 #define wp_works_ok 1 23 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */ 24 25 /* 26 * User lives in his very own context, and cannot reference us. Note 27 * that TASK_SIZE is a misnomer, it really gives maximum user virtual 28 * address that the kernel will allocate out. 29 * 30 * XXX No longer using virtual page tables, kill this upper limit... 31 */ 32 #define VA_BITS 44 33 #ifndef __ASSEMBLY__ 34 #define VPTE_SIZE (1UL << (VA_BITS - PAGE_SHIFT + 3)) 35 #else 36 #define VPTE_SIZE (1 << (VA_BITS - PAGE_SHIFT + 3)) 37 #endif 38 39 #define TASK_SIZE_OF(tsk) \ 40 (test_tsk_thread_flag(tsk,TIF_32BIT) ? \ 41 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE)) 42 #define TASK_SIZE \ 43 (test_thread_flag(TIF_32BIT) ? \ 44 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE)) 45 #ifdef __KERNEL__ 46 47 #define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE) 48 #define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL)) 49 50 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 51 STACK_TOP32 : STACK_TOP64) 52 53 #define STACK_TOP_MAX STACK_TOP64 54 55 #endif 56 57 #ifndef __ASSEMBLY__ 58 59 typedef struct { 60 unsigned char seg; 61 } mm_segment_t; 62 63 /* The Sparc processor specific thread struct. */ 64 /* XXX This should die, everything can go into thread_info now. */ 65 struct thread_struct { 66 #ifdef CONFIG_DEBUG_SPINLOCK 67 /* How many spinlocks held by this thread. 68 * Used with spin lock debugging to catch tasks 69 * sleeping illegally with locks held. 70 */ 71 int smp_lock_count; 72 unsigned int smp_lock_pc; 73 #else 74 int dummy; /* f'in gcc bug... */ 75 #endif 76 }; 77 78 #endif /* !(__ASSEMBLY__) */ 79 80 #ifndef CONFIG_DEBUG_SPINLOCK 81 #define INIT_THREAD { \ 82 0, \ 83 } 84 #else /* CONFIG_DEBUG_SPINLOCK */ 85 #define INIT_THREAD { \ 86 /* smp_lock_count, smp_lock_pc, */ \ 87 0, 0, \ 88 } 89 #endif /* !(CONFIG_DEBUG_SPINLOCK) */ 90 91 #ifndef __ASSEMBLY__ 92 93 #include <linux/types.h> 94 #include <asm/fpumacro.h> 95 96 /* Return saved PC of a blocked thread. */ 97 struct task_struct; 98 unsigned long thread_saved_pc(struct task_struct *); 99 100 /* On Uniprocessor, even in RMO processes see TSO semantics */ 101 #ifdef CONFIG_SMP 102 #define TSTATE_INITIAL_MM TSTATE_TSO 103 #else 104 #define TSTATE_INITIAL_MM TSTATE_RMO 105 #endif 106 107 /* Do necessary setup to start up a newly executed thread. */ 108 #define start_thread(regs, pc, sp) \ 109 do { \ 110 unsigned long __asi = ASI_PNF; \ 111 regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \ 112 regs->tpc = ((pc & (~3)) - 4); \ 113 regs->tnpc = regs->tpc + 4; \ 114 regs->y = 0; \ 115 set_thread_wstate(1 << 3); \ 116 if (current_thread_info()->utraps) { \ 117 if (*(current_thread_info()->utraps) < 2) \ 118 kfree(current_thread_info()->utraps); \ 119 else \ 120 (*(current_thread_info()->utraps))--; \ 121 current_thread_info()->utraps = NULL; \ 122 } \ 123 __asm__ __volatile__( \ 124 "stx %%g0, [%0 + %2 + 0x00]\n\t" \ 125 "stx %%g0, [%0 + %2 + 0x08]\n\t" \ 126 "stx %%g0, [%0 + %2 + 0x10]\n\t" \ 127 "stx %%g0, [%0 + %2 + 0x18]\n\t" \ 128 "stx %%g0, [%0 + %2 + 0x20]\n\t" \ 129 "stx %%g0, [%0 + %2 + 0x28]\n\t" \ 130 "stx %%g0, [%0 + %2 + 0x30]\n\t" \ 131 "stx %%g0, [%0 + %2 + 0x38]\n\t" \ 132 "stx %%g0, [%0 + %2 + 0x40]\n\t" \ 133 "stx %%g0, [%0 + %2 + 0x48]\n\t" \ 134 "stx %%g0, [%0 + %2 + 0x50]\n\t" \ 135 "stx %%g0, [%0 + %2 + 0x58]\n\t" \ 136 "stx %%g0, [%0 + %2 + 0x60]\n\t" \ 137 "stx %%g0, [%0 + %2 + 0x68]\n\t" \ 138 "stx %1, [%0 + %2 + 0x70]\n\t" \ 139 "stx %%g0, [%0 + %2 + 0x78]\n\t" \ 140 "wrpr %%g0, (1 << 3), %%wstate\n\t" \ 141 : \ 142 : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \ 143 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ 144 fprs_write(0); \ 145 current_thread_info()->xfsr[0] = 0; \ 146 current_thread_info()->fpsaved[0] = 0; \ 147 regs->tstate &= ~TSTATE_PEF; \ 148 } while (0) 149 150 #define start_thread32(regs, pc, sp) \ 151 do { \ 152 unsigned long __asi = ASI_PNF; \ 153 pc &= 0x00000000ffffffffUL; \ 154 sp &= 0x00000000ffffffffUL; \ 155 regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \ 156 regs->tpc = ((pc & (~3)) - 4); \ 157 regs->tnpc = regs->tpc + 4; \ 158 regs->y = 0; \ 159 set_thread_wstate(2 << 3); \ 160 if (current_thread_info()->utraps) { \ 161 if (*(current_thread_info()->utraps) < 2) \ 162 kfree(current_thread_info()->utraps); \ 163 else \ 164 (*(current_thread_info()->utraps))--; \ 165 current_thread_info()->utraps = NULL; \ 166 } \ 167 __asm__ __volatile__( \ 168 "stx %%g0, [%0 + %2 + 0x00]\n\t" \ 169 "stx %%g0, [%0 + %2 + 0x08]\n\t" \ 170 "stx %%g0, [%0 + %2 + 0x10]\n\t" \ 171 "stx %%g0, [%0 + %2 + 0x18]\n\t" \ 172 "stx %%g0, [%0 + %2 + 0x20]\n\t" \ 173 "stx %%g0, [%0 + %2 + 0x28]\n\t" \ 174 "stx %%g0, [%0 + %2 + 0x30]\n\t" \ 175 "stx %%g0, [%0 + %2 + 0x38]\n\t" \ 176 "stx %%g0, [%0 + %2 + 0x40]\n\t" \ 177 "stx %%g0, [%0 + %2 + 0x48]\n\t" \ 178 "stx %%g0, [%0 + %2 + 0x50]\n\t" \ 179 "stx %%g0, [%0 + %2 + 0x58]\n\t" \ 180 "stx %%g0, [%0 + %2 + 0x60]\n\t" \ 181 "stx %%g0, [%0 + %2 + 0x68]\n\t" \ 182 "stx %1, [%0 + %2 + 0x70]\n\t" \ 183 "stx %%g0, [%0 + %2 + 0x78]\n\t" \ 184 "wrpr %%g0, (2 << 3), %%wstate\n\t" \ 185 : \ 186 : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \ 187 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ 188 fprs_write(0); \ 189 current_thread_info()->xfsr[0] = 0; \ 190 current_thread_info()->fpsaved[0] = 0; \ 191 regs->tstate &= ~TSTATE_PEF; \ 192 } while (0) 193 194 /* Free all resources held by a thread. */ 195 #define release_thread(tsk) do { } while (0) 196 197 unsigned long get_wchan(struct task_struct *task); 198 199 #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs) 200 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc) 201 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP]) 202 203 /* Please see the commentary in asm/backoff.h for a description of 204 * what these instructions are doing and how they have been choosen. 205 * To make a long story short, we are trying to yield the current cpu 206 * strand during busy loops. 207 */ 208 #define cpu_relax() asm volatile("\n99:\n\t" \ 209 "rd %%ccr, %%g0\n\t" \ 210 "rd %%ccr, %%g0\n\t" \ 211 "rd %%ccr, %%g0\n\t" \ 212 ".section .pause_3insn_patch,\"ax\"\n\t"\ 213 ".word 99b\n\t" \ 214 "wr %%g0, 128, %%asr27\n\t" \ 215 "nop\n\t" \ 216 "nop\n\t" \ 217 ".previous" \ 218 ::: "memory") 219 #define cpu_relax_lowlatency() cpu_relax() 220 221 /* Prefetch support. This is tuned for UltraSPARC-III and later. 222 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has 223 * a shallower prefetch queue than later chips. 224 */ 225 #define ARCH_HAS_PREFETCH 226 #define ARCH_HAS_PREFETCHW 227 #define ARCH_HAS_SPINLOCK_PREFETCH 228 229 static inline void prefetch(const void *x) 230 { 231 /* We do not use the read prefetch mnemonic because that 232 * prefetches into the prefetch-cache which only is accessible 233 * by floating point operations in UltraSPARC-III and later. 234 * By contrast, "#one_write" prefetches into the L2 cache 235 * in shared state. 236 */ 237 __asm__ __volatile__("prefetch [%0], #one_write" 238 : /* no outputs */ 239 : "r" (x)); 240 } 241 242 static inline void prefetchw(const void *x) 243 { 244 /* The most optimal prefetch to use for writes is 245 * "#n_writes". This brings the cacheline into the 246 * L2 cache in "owned" state. 247 */ 248 __asm__ __volatile__("prefetch [%0], #n_writes" 249 : /* no outputs */ 250 : "r" (x)); 251 } 252 253 #define spin_lock_prefetch(x) prefetchw(x) 254 255 #define HAVE_ARCH_PICK_MMAP_LAYOUT 256 257 int do_mathemu(struct pt_regs *regs, struct fpustate *f, bool illegal_insn_trap); 258 259 #endif /* !(__ASSEMBLY__) */ 260 261 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */ 262