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