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