/* $Id: thread_info.h,v 1.1 2002/02/10 00:00:58 davem Exp $ * thread_info.h: sparc64 low-level thread information * * Copyright (C) 2002 David S. Miller (davem@redhat.com) */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #ifdef __KERNEL__ #define NSWINS 7 #define TI_FLAG_BYTE_FAULT_CODE 0 #define TI_FLAG_FAULT_CODE_SHIFT 56 #define TI_FLAG_BYTE_WSTATE 1 #define TI_FLAG_WSTATE_SHIFT 48 #define TI_FLAG_BYTE_CWP 2 #define TI_FLAG_CWP_SHIFT 40 #define TI_FLAG_BYTE_CURRENT_DS 3 #define TI_FLAG_CURRENT_DS_SHIFT 32 #define TI_FLAG_BYTE_FPDEPTH 4 #define TI_FLAG_FPDEPTH_SHIFT 24 #define TI_FLAG_BYTE_WSAVED 5 #define TI_FLAG_WSAVED_SHIFT 16 #include #ifndef __ASSEMBLY__ #include #include struct task_struct; struct exec_domain; struct thread_info { /* D$ line 1 */ struct task_struct *task; unsigned long flags; __u8 cpu; __u8 fpsaved[7]; unsigned long ksp; /* D$ line 2 */ unsigned long fault_address; struct pt_regs *kregs; struct exec_domain *exec_domain; int preempt_count; /* 0 => preemptable, <0 => BUG */ __u8 new_child; __u8 syscall_noerror; __u16 __pad; unsigned long *utraps; struct reg_window reg_window[NSWINS]; unsigned long rwbuf_stkptrs[NSWINS]; unsigned long gsr[7]; unsigned long xfsr[7]; __u64 __user *user_cntd0; __u64 __user *user_cntd1; __u64 kernel_cntd0, kernel_cntd1; __u64 pcr_reg; __u64 cee_stuff; struct restart_block restart_block; struct pt_regs *kern_una_regs; unsigned int kern_una_insn; unsigned long fpregs[0] __attribute__ ((aligned(64))); }; #endif /* !(__ASSEMBLY__) */ /* offsets into the thread_info struct for assembly code access */ #define TI_TASK 0x00000000 #define TI_FLAGS 0x00000008 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE) #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE) #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP) #define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS) #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH) #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED) #define TI_CPU 0x00000010 #define TI_FPSAVED 0x00000011 #define TI_KSP 0x00000018 #define TI_FAULT_ADDR 0x00000020 #define TI_KREGS 0x00000028 #define TI_EXEC_DOMAIN 0x00000030 #define TI_PRE_COUNT 0x00000038 #define TI_NEW_CHILD 0x0000003c #define TI_SYS_NOERROR 0x0000003d #define TI_UTRAPS 0x00000040 #define TI_REG_WINDOW 0x00000048 #define TI_RWIN_SPTRS 0x000003c8 #define TI_GSR 0x00000400 #define TI_XFSR 0x00000438 #define TI_USER_CNTD0 0x00000470 #define TI_USER_CNTD1 0x00000478 #define TI_KERN_CNTD0 0x00000480 #define TI_KERN_CNTD1 0x00000488 #define TI_PCR 0x00000490 #define TI_CEE_STUFF 0x00000498 #define TI_RESTART_BLOCK 0x000004a0 #define TI_KUNA_REGS 0x000004c8 #define TI_KUNA_INSN 0x000004d0 #define TI_FPREGS 0x00000500 /* We embed this in the uppermost byte of thread_info->flags */ #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */ #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */ #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */ #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */ #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */ #if PAGE_SHIFT == 13 #define THREAD_SIZE (2*PAGE_SIZE) #define THREAD_SHIFT (PAGE_SHIFT + 1) #else /* PAGE_SHIFT == 13 */ #define THREAD_SIZE PAGE_SIZE #define THREAD_SHIFT PAGE_SHIFT #endif /* PAGE_SHIFT == 13 */ #define PREEMPT_ACTIVE 0x4000000 /* * macros/functions for gaining access to the thread information structure * * preempt_count needs to be 1 initially, until the scheduler is functional. */ #ifndef __ASSEMBLY__ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \ .exec_domain = &default_exec_domain, \ .preempt_count = 1, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) /* how to get the thread information struct from C */ register struct thread_info *current_thread_info_reg asm("g6"); #define current_thread_info() (current_thread_info_reg) /* thread information allocation */ #if PAGE_SHIFT == 13 #define __THREAD_INFO_ORDER 1 #else /* PAGE_SHIFT == 13 */ #define __THREAD_INFO_ORDER 0 #endif /* PAGE_SHIFT == 13 */ #ifdef CONFIG_DEBUG_STACK_USAGE #define alloc_thread_info(tsk) \ ({ \ struct thread_info *ret; \ \ ret = (struct thread_info *) \ __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \ if (ret) \ memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \ ret; \ }) #else #define alloc_thread_info(tsk) \ ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER)) #endif #define free_thread_info(ti) \ free_pages((unsigned long)(ti),__THREAD_INFO_ORDER) #define __thread_flag_byte_ptr(ti) \ ((unsigned char *)(&((ti)->flags))) #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info()) #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE]) #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val)) #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE]) #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS]) #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val)) #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) #endif /* !(__ASSEMBLY__) */ /* * Thread information flags, only 16 bits are available as we encode * other values into the upper 6 bytes. * * On trap return we need to test several values: * * user: need_resched, notify_resume, sigpending, wsaved, perfctr * kernel: fpdepth * * So to check for work in the kernel case we simply load the fpdepth * byte out of the flags and test it. For the user case we encode the * lower 3 bytes of flags as follows: * ---------------------------------------- * | wsaved | flags byte 1 | flags byte 2 | * ---------------------------------------- * This optimizes the user test into: * ldx [%g6 + TI_FLAGS], REG1 * sethi %hi(_TIF_USER_WORK_MASK), REG2 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2 * andcc REG1, REG2, %g0 * be,pt no_work_to_do * nop */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_PERFCTR 4 /* performance counters active */ #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */ #define TIF_NEWSIGNALS 6 /* wants new-style signals */ #define TIF_32BIT 7 /* 32-bit binary */ /* flag bit 8 is available */ #define TIF_SECCOMP 9 /* secure computing */ #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */ /* flag bit 11 is available */ /* NOTE: Thread flags >= 12 should be ones we have no interest * in using in assembly, else we can't use the mask as * an immediate value in instructions such as andcc. */ #define TIF_ABI_PENDING 12 #define TIF_MEMDIE 13 #define TIF_POLLING_NRFLAG 14 #define _TIF_SYSCALL_TRACE (1<