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