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 TASK_SIZE_OF(current) 46 #ifdef __KERNEL__ 47 48 #define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE) 49 #define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL)) 50 51 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 52 STACK_TOP32 : STACK_TOP64) 53 54 #define STACK_TOP_MAX STACK_TOP64 55 56 #endif 57 58 #ifndef __ASSEMBLY__ 59 60 typedef struct { 61 unsigned char seg; 62 } mm_segment_t; 63 64 /* The Sparc processor specific thread struct. */ 65 /* XXX This should die, everything can go into thread_info now. */ 66 struct thread_struct { 67 #ifdef CONFIG_DEBUG_SPINLOCK 68 /* How many spinlocks held by this thread. 69 * Used with spin lock debugging to catch tasks 70 * sleeping illegally with locks held. 71 */ 72 int smp_lock_count; 73 unsigned int smp_lock_pc; 74 #else 75 int dummy; /* f'in gcc bug... */ 76 #endif 77 }; 78 79 #endif /* !(__ASSEMBLY__) */ 80 81 #ifndef CONFIG_DEBUG_SPINLOCK 82 #define INIT_THREAD { \ 83 0, \ 84 } 85 #else /* CONFIG_DEBUG_SPINLOCK */ 86 #define INIT_THREAD { \ 87 /* smp_lock_count, smp_lock_pc, */ \ 88 0, 0, \ 89 } 90 #endif /* !(CONFIG_DEBUG_SPINLOCK) */ 91 92 #ifndef __ASSEMBLY__ 93 94 #include <linux/types.h> 95 96 /* Return saved PC of a blocked thread. */ 97 struct task_struct; 98 extern 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 } 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 } while (0) 185 186 /* Free all resources held by a thread. */ 187 #define release_thread(tsk) do { } while (0) 188 189 /* Prepare to copy thread state - unlazy all lazy status */ 190 #define prepare_to_copy(tsk) do { } while (0) 191 192 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 193 194 extern unsigned long get_wchan(struct task_struct *task); 195 196 #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs) 197 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc) 198 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP]) 199 200 #define cpu_relax() barrier() 201 202 /* Prefetch support. This is tuned for UltraSPARC-III and later. 203 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has 204 * a shallower prefetch queue than later chips. 205 */ 206 #define ARCH_HAS_PREFETCH 207 #define ARCH_HAS_PREFETCHW 208 #define ARCH_HAS_SPINLOCK_PREFETCH 209 210 static inline void prefetch(const void *x) 211 { 212 /* We do not use the read prefetch mnemonic because that 213 * prefetches into the prefetch-cache which only is accessible 214 * by floating point operations in UltraSPARC-III and later. 215 * By contrast, "#one_write" prefetches into the L2 cache 216 * in shared state. 217 */ 218 __asm__ __volatile__("prefetch [%0], #one_write" 219 : /* no outputs */ 220 : "r" (x)); 221 } 222 223 static inline void prefetchw(const void *x) 224 { 225 /* The most optimal prefetch to use for writes is 226 * "#n_writes". This brings the cacheline into the 227 * L2 cache in "owned" state. 228 */ 229 __asm__ __volatile__("prefetch [%0], #n_writes" 230 : /* no outputs */ 231 : "r" (x)); 232 } 233 234 #define spin_lock_prefetch(x) prefetchw(x) 235 236 #define HAVE_ARCH_PICK_MMAP_LAYOUT 237 238 #endif /* !(__ASSEMBLY__) */ 239 240 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */ 241