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 TASK_SIZE_OF(current) 43 #ifdef __KERNEL__ 44 45 #define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE) 46 #define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL)) 47 48 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 49 STACK_TOP32 : STACK_TOP64) 50 51 #define STACK_TOP_MAX STACK_TOP64 52 53 #endif 54 55 #ifndef __ASSEMBLY__ 56 57 typedef struct { 58 unsigned char seg; 59 } mm_segment_t; 60 61 /* The Sparc processor specific thread struct. */ 62 /* XXX This should die, everything can go into thread_info now. */ 63 struct thread_struct { 64 #ifdef CONFIG_DEBUG_SPINLOCK 65 /* How many spinlocks held by this thread. 66 * Used with spin lock debugging to catch tasks 67 * sleeping illegally with locks held. 68 */ 69 int smp_lock_count; 70 unsigned int smp_lock_pc; 71 #else 72 int dummy; /* f'in gcc bug... */ 73 #endif 74 }; 75 76 #endif /* !(__ASSEMBLY__) */ 77 78 #ifndef CONFIG_DEBUG_SPINLOCK 79 #define INIT_THREAD { \ 80 0, \ 81 } 82 #else /* CONFIG_DEBUG_SPINLOCK */ 83 #define INIT_THREAD { \ 84 /* smp_lock_count, smp_lock_pc, */ \ 85 0, 0, \ 86 } 87 #endif /* !(CONFIG_DEBUG_SPINLOCK) */ 88 89 #ifndef __ASSEMBLY__ 90 91 #include <linux/types.h> 92 93 /* Return saved PC of a blocked thread. */ 94 struct task_struct; 95 extern unsigned long thread_saved_pc(struct task_struct *); 96 97 /* On Uniprocessor, even in RMO processes see TSO semantics */ 98 #ifdef CONFIG_SMP 99 #define TSTATE_INITIAL_MM TSTATE_TSO 100 #else 101 #define TSTATE_INITIAL_MM TSTATE_RMO 102 #endif 103 104 /* Do necessary setup to start up a newly executed thread. */ 105 #define start_thread(regs, pc, sp) \ 106 do { \ 107 unsigned long __asi = ASI_PNF; \ 108 regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \ 109 regs->tpc = ((pc & (~3)) - 4); \ 110 regs->tnpc = regs->tpc + 4; \ 111 regs->y = 0; \ 112 set_thread_wstate(1 << 3); \ 113 if (current_thread_info()->utraps) { \ 114 if (*(current_thread_info()->utraps) < 2) \ 115 kfree(current_thread_info()->utraps); \ 116 else \ 117 (*(current_thread_info()->utraps))--; \ 118 current_thread_info()->utraps = NULL; \ 119 } \ 120 __asm__ __volatile__( \ 121 "stx %%g0, [%0 + %2 + 0x00]\n\t" \ 122 "stx %%g0, [%0 + %2 + 0x08]\n\t" \ 123 "stx %%g0, [%0 + %2 + 0x10]\n\t" \ 124 "stx %%g0, [%0 + %2 + 0x18]\n\t" \ 125 "stx %%g0, [%0 + %2 + 0x20]\n\t" \ 126 "stx %%g0, [%0 + %2 + 0x28]\n\t" \ 127 "stx %%g0, [%0 + %2 + 0x30]\n\t" \ 128 "stx %%g0, [%0 + %2 + 0x38]\n\t" \ 129 "stx %%g0, [%0 + %2 + 0x40]\n\t" \ 130 "stx %%g0, [%0 + %2 + 0x48]\n\t" \ 131 "stx %%g0, [%0 + %2 + 0x50]\n\t" \ 132 "stx %%g0, [%0 + %2 + 0x58]\n\t" \ 133 "stx %%g0, [%0 + %2 + 0x60]\n\t" \ 134 "stx %%g0, [%0 + %2 + 0x68]\n\t" \ 135 "stx %1, [%0 + %2 + 0x70]\n\t" \ 136 "stx %%g0, [%0 + %2 + 0x78]\n\t" \ 137 "wrpr %%g0, (1 << 3), %%wstate\n\t" \ 138 : \ 139 : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \ 140 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ 141 } while (0) 142 143 #define start_thread32(regs, pc, sp) \ 144 do { \ 145 unsigned long __asi = ASI_PNF; \ 146 pc &= 0x00000000ffffffffUL; \ 147 sp &= 0x00000000ffffffffUL; \ 148 regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \ 149 regs->tpc = ((pc & (~3)) - 4); \ 150 regs->tnpc = regs->tpc + 4; \ 151 regs->y = 0; \ 152 set_thread_wstate(2 << 3); \ 153 if (current_thread_info()->utraps) { \ 154 if (*(current_thread_info()->utraps) < 2) \ 155 kfree(current_thread_info()->utraps); \ 156 else \ 157 (*(current_thread_info()->utraps))--; \ 158 current_thread_info()->utraps = NULL; \ 159 } \ 160 __asm__ __volatile__( \ 161 "stx %%g0, [%0 + %2 + 0x00]\n\t" \ 162 "stx %%g0, [%0 + %2 + 0x08]\n\t" \ 163 "stx %%g0, [%0 + %2 + 0x10]\n\t" \ 164 "stx %%g0, [%0 + %2 + 0x18]\n\t" \ 165 "stx %%g0, [%0 + %2 + 0x20]\n\t" \ 166 "stx %%g0, [%0 + %2 + 0x28]\n\t" \ 167 "stx %%g0, [%0 + %2 + 0x30]\n\t" \ 168 "stx %%g0, [%0 + %2 + 0x38]\n\t" \ 169 "stx %%g0, [%0 + %2 + 0x40]\n\t" \ 170 "stx %%g0, [%0 + %2 + 0x48]\n\t" \ 171 "stx %%g0, [%0 + %2 + 0x50]\n\t" \ 172 "stx %%g0, [%0 + %2 + 0x58]\n\t" \ 173 "stx %%g0, [%0 + %2 + 0x60]\n\t" \ 174 "stx %%g0, [%0 + %2 + 0x68]\n\t" \ 175 "stx %1, [%0 + %2 + 0x70]\n\t" \ 176 "stx %%g0, [%0 + %2 + 0x78]\n\t" \ 177 "wrpr %%g0, (2 << 3), %%wstate\n\t" \ 178 : \ 179 : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \ 180 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ 181 } while (0) 182 183 /* Free all resources held by a thread. */ 184 #define release_thread(tsk) do { } while (0) 185 186 /* Prepare to copy thread state - unlazy all lazy status */ 187 #define prepare_to_copy(tsk) do { } while (0) 188 189 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 190 191 extern unsigned long get_wchan(struct task_struct *task); 192 193 #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs) 194 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc) 195 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP]) 196 197 #define cpu_relax() barrier() 198 199 /* Prefetch support. This is tuned for UltraSPARC-III and later. 200 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has 201 * a shallower prefetch queue than later chips. 202 */ 203 #define ARCH_HAS_PREFETCH 204 #define ARCH_HAS_PREFETCHW 205 #define ARCH_HAS_SPINLOCK_PREFETCH 206 207 static inline void prefetch(const void *x) 208 { 209 /* We do not use the read prefetch mnemonic because that 210 * prefetches into the prefetch-cache which only is accessible 211 * by floating point operations in UltraSPARC-III and later. 212 * By contrast, "#one_write" prefetches into the L2 cache 213 * in shared state. 214 */ 215 __asm__ __volatile__("prefetch [%0], #one_write" 216 : /* no outputs */ 217 : "r" (x)); 218 } 219 220 static inline void prefetchw(const void *x) 221 { 222 /* The most optimal prefetch to use for writes is 223 * "#n_writes". This brings the cacheline into the 224 * L2 cache in "owned" state. 225 */ 226 __asm__ __volatile__("prefetch [%0], #n_writes" 227 : /* no outputs */ 228 : "r" (x)); 229 } 230 231 #define spin_lock_prefetch(x) prefetchw(x) 232 233 #define HAVE_ARCH_PICK_MMAP_LAYOUT 234 235 #endif /* !(__ASSEMBLY__) */ 236 237 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */ 238