arch/openrisc/include/asm/processor.h

Source file repositories/reference/linux-study-clean/arch/openrisc/include/asm/processor.h

File Facts

System
Linux kernel
Corpus path
arch/openrisc/include/asm/processor.h
Extension
.h
Size
2401 bytes
Lines
83
Domain
Architecture Layer
Bucket
arch/openrisc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct thread_struct {
	long fpcsr;		/* Floating point control status register. */
};

/*
 * At user->kernel entry, the pt_regs struct is stacked on the top of the
 * kernel-stack.  This macro allows us to find those regs for a task.
 * Notice that subsequent pt_regs stackings, like recursive interrupts
 * occurring while we're in the kernel, won't affect this - only the first
 * user->kernel transition registers are reached by this (i.e. not regs
 * for running signal handler)
 */
#define user_regs(thread_info)  (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE - STACK_FRAME_OVERHEAD)) - 1)

/*
 * Dito but for the currently running task
 */

#define task_pt_regs(task) user_regs(task_thread_info(task))

#define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)

#define INIT_THREAD  { }


#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)


void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
unsigned long __get_wchan(struct task_struct *p);
void show_registers(struct pt_regs *regs);

#define cpu_relax()     barrier()

#endif /* __ASSEMBLER__ */
#endif /* __ASM_OPENRISC_PROCESSOR_H */

Annotation

Implementation Notes