/* * include/asm/processor.h * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) */ #ifndef __ASM_SPARC64_PROCESSOR_H #define __ASM_SPARC64_PROCESSOR_H /* * Sparc64 implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; }) #include #include #include #include /* Don't hold the runqueue lock over context switch */ #define __ARCH_WANT_UNLOCKED_CTXSW /* The sparc has no problems with write protection */ #define wp_works_ok 1 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */ /* * User lives in his very own context, and cannot reference us. Note * that TASK_SIZE is a misnomer, it really gives maximum user virtual * address that the kernel will allocate out. * * XXX No longer using virtual page tables, kill this upper limit... */ #define VA_BITS 44 #ifndef __ASSEMBLY__ #define VPTE_SIZE (1UL << (VA_BITS - PAGE_SHIFT + 3)) #else #define VPTE_SIZE (1 << (VA_BITS - PAGE_SHIFT + 3)) #endif #define TASK_SIZE_OF(tsk) \ (test_tsk_thread_flag(tsk,TIF_32BIT) ? \ (1UL << 32UL) : ((unsigned long)-VPTE_SIZE)) #define TASK_SIZE TASK_SIZE_OF(current) #ifdef __KERNEL__ #define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE) #define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL)) #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ STACK_TOP32 : STACK_TOP64) #define STACK_TOP_MAX STACK_TOP64 #endif #ifndef __ASSEMBLY__ typedef struct { unsigned char seg; } mm_segment_t; /* The Sparc processor specific thread struct. */ /* XXX This should die, everything can go into thread_info now. */ struct thread_struct { #ifdef CONFIG_DEBUG_SPINLOCK /* How many spinlocks held by this thread. * Used with spin lock debugging to catch tasks * sleeping illegally with locks held. */ int smp_lock_count; unsigned int smp_lock_pc; #else int dummy; /* f'in gcc bug... */ #endif }; #endif /* !(__ASSEMBLY__) */ #ifndef CONFIG_DEBUG_SPINLOCK #define INIT_THREAD { \ 0, \ } #else /* CONFIG_DEBUG_SPINLOCK */ #define INIT_THREAD { \ /* smp_lock_count, smp_lock_pc, */ \ 0, 0, \ } #endif /* !(CONFIG_DEBUG_SPINLOCK) */ #ifndef __ASSEMBLY__ #include /* Return saved PC of a blocked thread. */ struct task_struct; extern unsigned long thread_saved_pc(struct task_struct *); /* On Uniprocessor, even in RMO processes see TSO semantics */ #ifdef CONFIG_SMP #define TSTATE_INITIAL_MM TSTATE_TSO #else #define TSTATE_INITIAL_MM TSTATE_RMO #endif /* Do necessary setup to start up a newly executed thread. */ #define start_thread(regs, pc, sp) \ do { \ unsigned long __asi = ASI_PNF; \ regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \ regs->tpc = ((pc & (~3)) - 4); \ regs->tnpc = regs->tpc + 4; \ regs->y = 0; \ set_thread_wstate(1 << 3); \ if (current_thread_info()->utraps) { \ if (*(current_thread_info()->utraps) < 2) \ kfree(current_thread_info()->utraps); \ else \ (*(current_thread_info()->utraps))--; \ current_thread_info()->utraps = NULL; \ } \ __asm__ __volatile__( \ "stx %%g0, [%0 + %2 + 0x00]\n\t" \ "stx %%g0, [%0 + %2 + 0x08]\n\t" \ "stx %%g0, [%0 + %2 + 0x10]\n\t" \ "stx %%g0, [%0 + %2 + 0x18]\n\t" \ "stx %%g0, [%0 + %2 + 0x20]\n\t" \ "stx %%g0, [%0 + %2 + 0x28]\n\t" \ "stx %%g0, [%0 + %2 + 0x30]\n\t" \ "stx %%g0, [%0 + %2 + 0x38]\n\t" \ "stx %%g0, [%0 + %2 + 0x40]\n\t" \ "stx %%g0, [%0 + %2 + 0x48]\n\t" \ "stx %%g0, [%0 + %2 + 0x50]\n\t" \ "stx %%g0, [%0 + %2 + 0x58]\n\t" \ "stx %%g0, [%0 + %2 + 0x60]\n\t" \ "stx %%g0, [%0 + %2 + 0x68]\n\t" \ "stx %1, [%0 + %2 + 0x70]\n\t" \ "stx %%g0, [%0 + %2 + 0x78]\n\t" \ "wrpr %%g0, (1 << 3), %%wstate\n\t" \ : \ : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \ "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ } while (0) #define start_thread32(regs, pc, sp) \ do { \ unsigned long __asi = ASI_PNF; \ pc &= 0x00000000ffffffffUL; \ sp &= 0x00000000ffffffffUL; \ regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \ regs->tpc = ((pc & (~3)) - 4); \ regs->tnpc = regs->tpc + 4; \ regs->y = 0; \ set_thread_wstate(2 << 3); \ if (current_thread_info()->utraps) { \ if (*(current_thread_info()->utraps) < 2) \ kfree(current_thread_info()->utraps); \ else \ (*(current_thread_info()->utraps))--; \ current_thread_info()->utraps = NULL; \ } \ __asm__ __volatile__( \ "stx %%g0, [%0 + %2 + 0x00]\n\t" \ "stx %%g0, [%0 + %2 + 0x08]\n\t" \ "stx %%g0, [%0 + %2 + 0x10]\n\t" \ "stx %%g0, [%0 + %2 + 0x18]\n\t" \ "stx %%g0, [%0 + %2 + 0x20]\n\t" \ "stx %%g0, [%0 + %2 + 0x28]\n\t" \ "stx %%g0, [%0 + %2 + 0x30]\n\t" \ "stx %%g0, [%0 + %2 + 0x38]\n\t" \ "stx %%g0, [%0 + %2 + 0x40]\n\t" \ "stx %%g0, [%0 + %2 + 0x48]\n\t" \ "stx %%g0, [%0 + %2 + 0x50]\n\t" \ "stx %%g0, [%0 + %2 + 0x58]\n\t" \ "stx %%g0, [%0 + %2 + 0x60]\n\t" \ "stx %%g0, [%0 + %2 + 0x68]\n\t" \ "stx %1, [%0 + %2 + 0x70]\n\t" \ "stx %%g0, [%0 + %2 + 0x78]\n\t" \ "wrpr %%g0, (2 << 3), %%wstate\n\t" \ : \ : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \ "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \ } while (0) /* Free all resources held by a thread. */ #define release_thread(tsk) do { } while (0) extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); extern unsigned long get_wchan(struct task_struct *task); #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs) #define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc) #define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP]) #define cpu_relax() barrier() /* Prefetch support. This is tuned for UltraSPARC-III and later. * UltraSPARC-I will treat these as nops, and UltraSPARC-II has * a shallower prefetch queue than later chips. */ #define ARCH_HAS_PREFETCH #define ARCH_HAS_PREFETCHW #define ARCH_HAS_SPINLOCK_PREFETCH static inline void prefetch(const void *x) { /* We do not use the read prefetch mnemonic because that * prefetches into the prefetch-cache which only is accessible * by floating point operations in UltraSPARC-III and later. * By contrast, "#one_write" prefetches into the L2 cache * in shared state. */ __asm__ __volatile__("prefetch [%0], #one_write" : /* no outputs */ : "r" (x)); } static inline void prefetchw(const void *x) { /* The most optimal prefetch to use for writes is * "#n_writes". This brings the cacheline into the * L2 cache in "owned" state. */ __asm__ __volatile__("prefetch [%0], #n_writes" : /* no outputs */ : "r" (x)); } #define spin_lock_prefetch(x) prefetchw(x) #define HAVE_ARCH_PICK_MMAP_LAYOUT #endif /* !(__ASSEMBLY__) */ #endif /* !(__ASM_SPARC64_PROCESSOR_H) */