arch/arc/include/asm/processor.h

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

File Facts

System
Linux kernel
Corpus path
arch/arc/include/asm/processor.h
Extension
.h
Size
3037 bytes
Lines
105
Domain
Architecture Layer
Bucket
arch/arc
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 {
	unsigned long callee_reg;	/* pointer to callee regs */
	unsigned long fault_address;	/* dbls as brkpt holder as well */
#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
	struct dsp_callee_regs dsp;
#endif
#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
	struct arc_fpu fpu;
#endif
};

#define INIT_THREAD  { }

/* Forward declaration, a strange C thing */
struct task_struct;

#define task_pt_regs(p) \
	((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)

/*
 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
 * get optimised away by gcc
 */
#define cpu_relax()		barrier()

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

/*
 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
 * Look in process.c for details of kernel stack layout
 */
#define TSK_K_ESP(tsk)		(task_thread_info(tsk)->ksp)

#define TSK_K_REG(tsk, off)	(*((unsigned long *)(TSK_K_ESP(tsk) + \
					sizeof(struct callee_regs) + off)))

#define TSK_K_BLINK(tsk)	TSK_K_REG(tsk, 4)
#define TSK_K_FP(tsk)		TSK_K_REG(tsk, 0)

extern void start_thread(struct pt_regs * regs, unsigned long pc,
			 unsigned long usp);

extern unsigned int __get_wchan(struct task_struct *p);

#endif /* !__ASSEMBLER__ */

/*
 * Default System Memory Map on ARC
 *
 * ---------------------------- (lower 2G, Translated) -------------------------
 * 0x0000_0000		0x5FFF_FFFF	(user vaddr: TASK_SIZE)
 * 0x6000_0000		0x6FFF_FFFF	(reserved gutter between U/K)
 * 0x7000_0000		0x7FFF_FFFF	(kvaddr: vmalloc/modules/pkmap..)
 *
 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
 * 0x8000_0000		0xBFFF_FFFF	(kernel direct mapped)
 * 0xC000_0000		0xFFFF_FFFF	(peripheral uncached space)
 * -----------------------------------------------------------------------------
 */

#define TASK_SIZE	0x60000000

#define VMALLOC_START	(PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))

/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
#define VMALLOC_SIZE	((CONFIG_ARC_KVADDR_SIZE << 20) - PMD_SIZE * 4)

#define VMALLOC_END	(VMALLOC_START + VMALLOC_SIZE)

#define USER_KERNEL_GUTTER    (VMALLOC_START - TASK_SIZE)

#define STACK_TOP       TASK_SIZE
#define STACK_TOP_MAX   STACK_TOP

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)

#endif /* __ASM_ARC_PROCESSOR_H */

Annotation

Implementation Notes