/* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem Exp $ * include/asm-sparc/processor.h * * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu) */ #ifndef __ASM_SPARC_PROCESSOR_H #define __ASM_SPARC_PROCESSOR_H /* * Sparc32 implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; }) #include #include #include #include #include #include #include #include #include /* * Bus types */ #define EISA_bus 0 #define EISA_bus__is_a_macro /* for versions in ksyms.c */ #define MCA_bus 0 #define MCA_bus__is_a_macro /* for versions in ksyms.c */ /* * 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 */ /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too... * That one page is used to protect kernel from intruders, so that * we can make our access_ok test faster */ #define TASK_SIZE PAGE_OFFSET struct fpq { unsigned long *insn_addr; unsigned long insn; }; typedef struct { int seg; } mm_segment_t; /* The Sparc processor specific thread struct. */ struct thread_struct { unsigned long uwinmask __attribute__ ((aligned (8))); struct pt_regs *kregs; /* Context switch saved kernel state. */ unsigned long ksp __attribute__ ((aligned (8))); unsigned long kpc; unsigned long kpsr; unsigned long kwim; /* Special child fork kpsr/kwim values. */ unsigned long fork_kpsr __attribute__ ((aligned (8))); unsigned long fork_kwim; /* A place to store user windows and stack pointers * when the stack needs inspection. */ #define NSWINS 8 struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8))); unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8))); unsigned long w_saved; /* Floating point regs */ unsigned long float_regs[32] __attribute__ ((aligned (8))); unsigned long fsr; unsigned long fpqdepth; struct fpq fpqueue[16]; unsigned long flags; mm_segment_t current_ds; struct exec core_exec; /* just what it says. */ int new_signal; atomic_t refcount; /* used for sun4c only */ }; #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */ #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */ #define INIT_THREAD { \ /* uwinmask, kregs, ksp, kpc, kpsr, kwim */ \ 0, 0, 0, 0, 0, 0, \ /* fork_kpsr, fork_kwim */ \ 0, 0, \ /* reg_window */ \ { { { 0, }, { 0, } }, }, \ /* rwbuf_stkptrs */ \ { 0, 0, 0, 0, 0, 0, 0, 0, }, \ /* w_saved */ \ 0, \ /* FPU regs */ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \ /* FPU status, FPU qdepth, FPU queue */ \ 0, 0, { { 0, 0, }, }, \ /* flags, current_ds, */ \ SPARC_FLAG_KTHREAD, KERNEL_DS, \ /* core_exec */ \ { 0, }, \ /* new_signal */ \ 0, \ } /* Return saved PC of a blocked thread. */ extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t) { return t->kpc; } /* Do necessary setup to start up a newly executed thread. */ extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp) { register unsigned long zero asm("g1"); regs->psr = (regs->psr & (PSR_CWP)) | PSR_S; regs->pc = ((pc & (~3)) - 4); regs->npc = regs->pc + 4; regs->y = 0; zero = 0; __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t" "std\t%%g0, [%0 + %3 + 0x08]\n\t" "std\t%%g0, [%0 + %3 + 0x10]\n\t" "std\t%%g0, [%0 + %3 + 0x18]\n\t" "std\t%%g0, [%0 + %3 + 0x20]\n\t" "std\t%%g0, [%0 + %3 + 0x28]\n\t" "std\t%%g0, [%0 + %3 + 0x30]\n\t" "st\t%1, [%0 + %3 + 0x38]\n\t" "st\t%%g0, [%0 + %3 + 0x3c]" : /* no outputs */ : "r" (regs), "r" (sp - sizeof(struct reg_window)), "r" (zero), "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])) : "memory"); } /* Free all resources held by a thread. */ #define release_thread(tsk) do { } while(0) extern pid_t arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); #define copy_segments(tsk, mm) do { } while (0) #define release_segments(mm) do { } while (0) #define get_wchan(__TSK) \ ({ extern void scheduling_functions_start_here(void); \ extern void scheduling_functions_end_here(void); \ unsigned long pc, fp, bias = 0; \ unsigned long task_base = (unsigned long) (__TSK); \ unsigned long __ret = 0; \ struct reg_window *rw; \ int count = 0; \ if (!(__TSK) || (__TSK) == current || \ (__TSK)->state == TASK_RUNNING) \ goto __out; \ fp = (__TSK)->thread.ksp + bias; \ do { \ /* Bogus frame pointer? */ \ if (fp < (task_base + sizeof(struct task_struct)) || \ fp >= (task_base + (2 * PAGE_SIZE))) \ break; \ rw = (struct reg_window *) fp; \ pc = rw->ins[7]; \ if (pc < ((unsigned long) scheduling_functions_start_here) || \ pc >= ((unsigned long) scheduling_functions_end_here)) { \ __ret = pc; \ goto __out; \ } \ fp = rw->ins[6] + bias; \ } while (++count < 16); \ __out: __ret; \ }) #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc) #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP]) #ifdef __KERNEL__ #define THREAD_SIZE (2*PAGE_SIZE) extern struct task_struct *last_task_used_math; /* Allocation and freeing of basic task resources. */ BTFIXUPDEF_CALL(struct task_struct *, alloc_task_struct, void) BTFIXUPDEF_CALL(void, free_task_struct, struct task_struct *) BTFIXUPDEF_CALL(void, get_task_struct, struct task_struct *) #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)() #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk) #define get_task_struct(tsk) BTFIXUP_CALL(get_task_struct)(tsk) #define init_task (init_task_union.task) #define init_stack (init_task_union.stack) #define cpu_relax() barrier() #endif #endif /* __ASM_SPARC_PROCESSOR_H */