1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * include/asm/processor.h 4 * 5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 6 */ 7 8 #ifndef __ASM_SPARC64_PROCESSOR_H 9 #define __ASM_SPARC64_PROCESSOR_H 10 11 #include <asm/asi.h> 12 #include <asm/pstate.h> 13 #include <asm/ptrace.h> 14 #include <asm/page.h> 15 16 /* 17 * User lives in his very own context, and cannot reference us. Note 18 * that TASK_SIZE is a misnomer, it really gives maximum user virtual 19 * address that the kernel will allocate out. 20 * 21 * XXX No longer using virtual page tables, kill this upper limit... 22 */ 23 #define VA_BITS 44 24 #ifndef __ASSEMBLY__ 25 #define VPTE_SIZE (1UL << (VA_BITS - PAGE_SHIFT + 3)) 26 #else 27 #define VPTE_SIZE (1 << (VA_BITS - PAGE_SHIFT + 3)) 28 #endif 29 30 #define TASK_SIZE_OF(tsk) \ 31 (test_tsk_thread_flag(tsk,TIF_32BIT) ? \ 32 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE)) 33 #define TASK_SIZE \ 34 (test_thread_flag(TIF_32BIT) ? \ 35 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE)) 36 #ifdef __KERNEL__ 37 38 #define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE) 39 #define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL)) 40 41 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 42 STACK_TOP32 : STACK_TOP64) 43 44 #define STACK_TOP_MAX STACK_TOP64 45 46 #endif 47 48 #ifndef __ASSEMBLY__ 49 50 /* The Sparc processor specific thread struct. */ 51 /* XXX This should die, everything can go into thread_info now. */ 52 struct thread_struct { 53 #ifdef CONFIG_DEBUG_SPINLOCK 54 /* How many spinlocks held by this thread. 55 * Used with spin lock debugging to catch tasks 56 * sleeping illegally with locks held. 57 */ 58 int smp_lock_count; 59 unsigned int smp_lock_pc; 60 #else 61 int dummy; /* f'in gcc bug... */ 62 #endif 63 }; 64 65 #endif /* !(__ASSEMBLY__) */ 66 67 #ifndef CONFIG_DEBUG_SPINLOCK 68 #define INIT_THREAD { \ 69 0, \ 70 } 71 #else /* CONFIG_DEBUG_SPINLOCK */ 72 #define INIT_THREAD { \ 73 /* smp_lock_count, smp_lock_pc, */ \ 74 0, 0, \ 75 } 76 #endif /* !(CONFIG_DEBUG_SPINLOCK) */ 77 78 #ifndef __ASSEMBLY__ 79 80 #include <linux/types.h> 81 #include <asm/fpumacro.h> 82 83 struct task_struct; 84 85 /* On Uniprocessor, even in RMO processes see TSO semantics */ 86 #ifdef CONFIG_SMP 87 #define TSTATE_INITIAL_MM TSTATE_TSO 88 #else 89 #define TSTATE_INITIAL_MM TSTATE_RMO 90 #endif 91 92 /* Do necessary setup to start up a newly executed thread. */ 93 #define start_thread(regs, pc, sp) \ 94 do { \ 95 unsigned long __asi = ASI_PNF; \ 96 regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \ 97 regs->tpc = ((pc & (~3)) - 4); \ 98 regs->tnpc = regs->tpc + 4; \ 99 regs->y = 0; \ 100 set_thread_wstate(1 << 3); \ 101 if (current_thread_info()->utraps) { \ 102 if (*(current_thread_info()->utraps) < 2) \ 103 kfree(current_thread_info()->utraps); \ 104 else \ 105 (*(current_thread_info()->utraps))--; \ 106 current_thread_info()->utraps = NULL; \ 107 } \ 108 __asm__ __volatile__( \ 109 "stx %%g0, [%0 + %2 + 0x00]\n\t" \ 110 "stx %%g0, [%0 + %2 + 0x08]\n\t" \ 111 "stx %%g0, [%0 + %2 + 0x10]\n\t" \ 112 "stx %%g0, [%0 + %2 + 0x18]\n\t" \ 113 "stx %%g0, [%0 + %2 + 0x20]\n\t" \ 114 "stx %%g0, [%0 + %2 + 0x28]\n\t" \ 115 "stx %%g0, [%0 + %2 + 0x30]\n\t" \ 116 "stx %%g0, [%0 + %2 + 0x38]\n\t" \ 117 "stx %%g0, [%0 + %2 + 0x40]\n\t" \ 118 "stx %%g0, [%0 + %2 + 0x48]\n\t" \ 119 "stx %%g0, [%0 + %2 + 0x50]\n\t" \ 120 "stx %%g0, [%0 + %2 + 0x58]\n\t" \ 121 "stx %%g0, [%0 + %2 + 0x60]\n\t" \ 122 "stx %%g0, [%0 + %2 + 0x68]\n\t" \ 123 "stx %1, [%0 + %2 + 0x70]\n\t" \ 124 "stx %%g0, [%0 + %2 + 0x78]\n\t" \ 125 "wrpr %%g0, (1 << 3), %%wstate\n\t" \ 126 : \ 127 : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \ 128 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ 129 fprs_write(0); \ 130 current_thread_info()->xfsr[0] = 0; \ 131 current_thread_info()->fpsaved[0] = 0; \ 132 regs->tstate &= ~TSTATE_PEF; \ 133 } while (0) 134 135 #define start_thread32(regs, pc, sp) \ 136 do { \ 137 unsigned long __asi = ASI_PNF; \ 138 pc &= 0x00000000ffffffffUL; \ 139 sp &= 0x00000000ffffffffUL; \ 140 regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \ 141 regs->tpc = ((pc & (~3)) - 4); \ 142 regs->tnpc = regs->tpc + 4; \ 143 regs->y = 0; \ 144 set_thread_wstate(2 << 3); \ 145 if (current_thread_info()->utraps) { \ 146 if (*(current_thread_info()->utraps) < 2) \ 147 kfree(current_thread_info()->utraps); \ 148 else \ 149 (*(current_thread_info()->utraps))--; \ 150 current_thread_info()->utraps = NULL; \ 151 } \ 152 __asm__ __volatile__( \ 153 "stx %%g0, [%0 + %2 + 0x00]\n\t" \ 154 "stx %%g0, [%0 + %2 + 0x08]\n\t" \ 155 "stx %%g0, [%0 + %2 + 0x10]\n\t" \ 156 "stx %%g0, [%0 + %2 + 0x18]\n\t" \ 157 "stx %%g0, [%0 + %2 + 0x20]\n\t" \ 158 "stx %%g0, [%0 + %2 + 0x28]\n\t" \ 159 "stx %%g0, [%0 + %2 + 0x30]\n\t" \ 160 "stx %%g0, [%0 + %2 + 0x38]\n\t" \ 161 "stx %%g0, [%0 + %2 + 0x40]\n\t" \ 162 "stx %%g0, [%0 + %2 + 0x48]\n\t" \ 163 "stx %%g0, [%0 + %2 + 0x50]\n\t" \ 164 "stx %%g0, [%0 + %2 + 0x58]\n\t" \ 165 "stx %%g0, [%0 + %2 + 0x60]\n\t" \ 166 "stx %%g0, [%0 + %2 + 0x68]\n\t" \ 167 "stx %1, [%0 + %2 + 0x70]\n\t" \ 168 "stx %%g0, [%0 + %2 + 0x78]\n\t" \ 169 "wrpr %%g0, (2 << 3), %%wstate\n\t" \ 170 : \ 171 : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \ 172 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ 173 fprs_write(0); \ 174 current_thread_info()->xfsr[0] = 0; \ 175 current_thread_info()->fpsaved[0] = 0; \ 176 regs->tstate &= ~TSTATE_PEF; \ 177 } while (0) 178 179 unsigned long __get_wchan(struct task_struct *task); 180 181 #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs) 182 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc) 183 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP]) 184 185 /* Please see the commentary in asm/backoff.h for a description of 186 * what these instructions are doing and how they have been chosen. 187 * To make a long story short, we are trying to yield the current cpu 188 * strand during busy loops. 189 */ 190 #ifdef BUILD_VDSO 191 #define cpu_relax() asm volatile("\n99:\n\t" \ 192 "rd %%ccr, %%g0\n\t" \ 193 "rd %%ccr, %%g0\n\t" \ 194 "rd %%ccr, %%g0\n\t" \ 195 ::: "memory") 196 #else /* ! BUILD_VDSO */ 197 #define cpu_relax() asm volatile("\n99:\n\t" \ 198 "rd %%ccr, %%g0\n\t" \ 199 "rd %%ccr, %%g0\n\t" \ 200 "rd %%ccr, %%g0\n\t" \ 201 ".section .pause_3insn_patch,\"ax\"\n\t"\ 202 ".word 99b\n\t" \ 203 "wr %%g0, 128, %%asr27\n\t" \ 204 "nop\n\t" \ 205 "nop\n\t" \ 206 ".previous" \ 207 ::: "memory") 208 #endif 209 210 /* Prefetch support. This is tuned for UltraSPARC-III and later. 211 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has 212 * a shallower prefetch queue than later chips. 213 */ 214 #define ARCH_HAS_PREFETCH 215 #define ARCH_HAS_PREFETCHW 216 217 static inline void prefetch(const void *x) 218 { 219 /* We do not use the read prefetch mnemonic because that 220 * prefetches into the prefetch-cache which only is accessible 221 * by floating point operations in UltraSPARC-III and later. 222 * By contrast, "#one_write" prefetches into the L2 cache 223 * in shared state. 224 */ 225 __asm__ __volatile__("prefetch [%0], #one_write" 226 : /* no outputs */ 227 : "r" (x)); 228 } 229 230 static inline void prefetchw(const void *x) 231 { 232 /* The most optimal prefetch to use for writes is 233 * "#n_writes". This brings the cacheline into the 234 * L2 cache in "owned" state. 235 */ 236 __asm__ __volatile__("prefetch [%0], #n_writes" 237 : /* no outputs */ 238 : "r" (x)); 239 } 240 241 #define HAVE_ARCH_PICK_MMAP_LAYOUT 242 243 int do_mathemu(struct pt_regs *regs, struct fpustate *f, bool illegal_insn_trap); 244 245 #endif /* !(__ASSEMBLY__) */ 246 247 #endif /* !(__ASM_SPARC64_PROCESSOR_H) */ 248