Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: processor.h,v 1.83 2002/02/10 06:04:33 davem Exp $ |
| 2 | * include/asm-sparc64/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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <asm/asi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/pstate.h> |
| 18 | #include <asm/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
David S. Miller | 74bf431 | 2006-01-31 18:29:18 -0800 | [diff] [blame] | 29 | * |
| 30 | * XXX No longer using virtual page tables, kill this upper limit... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
David Howells | 922a70d | 2008-02-08 04:19:26 -0800 | [diff] [blame] | 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #define TASK_SIZE ((unsigned long)-VPTE_SIZE) |
David S. Miller | c101b08 | 2008-03-26 17:32:33 -0700 | [diff] [blame] | 40 | #define TASK_SIZE_OF(tsk) \ |
| 41 | (test_tsk_thread_flag(tsk,TIF_32BIT) ? \ |
| 42 | (1UL << 32UL) : TASK_SIZE) |
David Howells | 922a70d | 2008-02-08 04:19:26 -0800 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 { \ |
David S. Miller | 0f05da6 | 2006-02-22 16:20:11 -0800 | [diff] [blame] | 107 | unsigned long __asi = ASI_PNF; \ |
| 108 | regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 { \ |
David S. Miller | 0f05da6 | 2006-02-22 16:20:11 -0800 | [diff] [blame] | 145 | unsigned long __asi = ASI_PNF; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | pc &= 0x00000000ffffffffUL; \ |
| 147 | sp &= 0x00000000ffffffffUL; \ |
David S. Miller | 0f05da6 | 2006-02-22 16:20:11 -0800 | [diff] [blame] | 148 | regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Al Viro | 26ecbde | 2006-01-12 01:05:43 -0800 | [diff] [blame] | 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]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | #define cpu_relax() barrier() |
| 198 | |
David S. Miller | 7049e68 | 2005-06-21 16:20:28 -0700 | [diff] [blame] | 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 | |
David S. Miller | a91690d | 2006-03-17 14:41:03 -0800 | [diff] [blame] | 233 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
| 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | #endif /* !(__ASSEMBLY__) */ |
| 236 | |
| 237 | #endif /* !(__ASM_SPARC64_PROCESSOR_H) */ |