/* * Copyright 2004-2009 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #ifndef __ASM_BFIN_PROCESSOR_H #define __ASM_BFIN_PROCESSOR_H /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ __label__ _l; _l: &&_l;}) #include <asm/ptrace.h> #include <mach/blackfin.h> static inline unsigned long rdusp(void) { unsigned long usp; __asm__ __volatile__("%0 = usp;\n\t":"=da"(usp)); return usp; } static inline void wrusp(unsigned long usp) { __asm__ __volatile__("usp = %0;\n\t"::"da"(usp)); } static inline unsigned long __get_SP(void) { unsigned long sp; __asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp)); return sp; } /* * User space process size: 1st byte beyond user address space. * Fairly meaningless on nommu. Parts of user programs can be scattered * in a lot of places, so just disable this by setting it to 0xFFFFFFFF. */ #define TASK_SIZE 0xFFFFFFFF #ifdef __KERNEL__ #define STACK_TOP TASK_SIZE #endif #define TASK_UNMAPPED_BASE 0 struct thread_struct { unsigned long ksp; /* kernel stack pointer */ unsigned long usp; /* user stack pointer */ unsigned short seqstat; /* saved status register */ unsigned long esp0; /* points to SR of stack frame pt_regs */ unsigned long pc; /* instruction pointer */ void * debuggerinfo; }; #define INIT_THREAD { \ sizeof(init_stack) + (unsigned long) init_stack, 0, \ PS_S, 0, 0 \ } extern void start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp); /* Forward declaration, a strange C thing */ struct task_struct; /* Free all resources held by a thread. */ static inline void release_thread(struct task_struct *dead_task) { } /* * Free current thread data structures etc.. */ static inline void exit_thread(void) { } /* * Return saved PC of a blocked thread. */ #define thread_saved_pc(tsk) (tsk->thread.pc) unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk) \ ({ \ unsigned long eip = 0; \ if ((tsk)->thread.esp0 > PAGE_SIZE && \ MAP_NR((tsk)->thread.esp0) < max_mapnr) \ eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ eip; }) #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) #define cpu_relax() smp_mb() #define cpu_relax_lowlatency() cpu_relax() /* Get the Silicon Revision of the chip */ static inline uint32_t __pure bfin_revid(void) { /* Always use CHIPID, to work around ANOMALY_05000234 */ uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28; #ifdef _BOOTROM_GET_DXE_ADDRESS_TWI /* * ANOMALY_05000364 * Incorrect Revision Number in DSPID Register */ if (ANOMALY_05000364 && bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI) == 0x2796) revid = 1; #endif return revid; } static inline uint16_t __pure bfin_cpuid(void) { return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12; } static inline uint32_t __pure bfin_dspid(void) { return bfin_read_DSPID(); } #define blackfin_core_id() (bfin_dspid() & 0xff) static inline uint32_t __pure bfin_compiled_revid(void) { #if defined(CONFIG_BF_REV_0_0) return 0; #elif defined(CONFIG_BF_REV_0_1) return 1; #elif defined(CONFIG_BF_REV_0_2) return 2; #elif defined(CONFIG_BF_REV_0_3) return 3; #elif defined(CONFIG_BF_REV_0_4) return 4; #elif defined(CONFIG_BF_REV_0_5) return 5; #elif defined(CONFIG_BF_REV_0_6) return 6; #elif defined(CONFIG_BF_REV_ANY) return 0xffff; #else return -1; #endif } #endif