processor.h

嵌入式ARM的一些源代码

 * able to combine mbx, fads, rpxlite, bseip, and classic into a single
 * generic 8xx as well.  The boards containing these processors are either
 * identical at the processor level (due to the high integration) or so
 * wildly different that testing _machine at run time is best replaced by
 * conditional compilation by board type (found in their respective .h file).
 *	-- Dan
 */
#define _MACH_prep	0x00000001
#define _MACH_Pmac	0x00000002	/* pmac or pmac clone (non-chrp) */
#define _MACH_chrp	0x00000004	/* chrp machine */
#define _MACH_mbx	0x00000008	/* Motorola MBX board */
#define _MACH_apus	0x00000010	/* amiga with phase5 powerup */
#define _MACH_fads	0x00000020	/* Motorola FADS board */
#define _MACH_rpxlite	0x00000040	/* RPCG RPX-Lite 8xx board */
#define _MACH_bseip	0x00000080	/* Bright Star Engineering ip-Engine */
#define _MACH_yk	0x00000100	/* Motorola Yellowknife */
#define _MACH_gemini	0x00000200	/* Synergy Microsystems gemini board */
#define _MACH_classic	0x00000400	/* RPCG RPX-Classic 8xx board */
#define _MACH_oak	0x00000800	/* IBM "Oak" 403 eval. board */
#define _MACH_walnut	0x00001000	/* IBM "Walnut" 405GP eval. board */
#define _MACH_8260	0x00002000	/* Generic 8260 */
#define _MACH_tqm860	0x00004000	/* TQM860/L */
#define _MACH_tqm8xxL	0x00008000	/* TQM8xxL */


/* see residual.h for these */
#define _PREP_Motorola 0x01  /* motorola prep */
#define _PREP_Firm     0x02  /* firmworks prep */
#define _PREP_IBM      0x00  /* ibm prep */
#define _PREP_Bull     0x03  /* bull prep */
#define _PREP_Radstone 0x04  /* Radstone Technology PLC prep */

/*
 * Radstone board types
 */
#define RS_SYS_TYPE_PPC1   0
#define RS_SYS_TYPE_PPC2   1
#define RS_SYS_TYPE_PPC1a  2
#define RS_SYS_TYPE_PPC2a  3
#define RS_SYS_TYPE_PPC4   4
#define RS_SYS_TYPE_PPC4a  5
#define RS_SYS_TYPE_PPC2ep 6

/* these are arbitrary */
#define _CHRP_Motorola 0x04  /* motorola chrp, the cobra */
#define _CHRP_IBM      0x05  /* IBM chrp, the longtrail and longtrail 2 */

#define _GLOBAL(n)\
	.globl n;\
n:

/* Macros for setting and retrieving special purpose registers */

#define stringify(s)	tostring(s)
#define tostring(s)	#s

#define mfdcr(rn)	({unsigned int rval; \
			asm volatile("mfdcr %0," stringify(rn) \
				     : "=r" (rval)); rval;})
#define mtdcr(rn, v)	asm volatile("mtdcr " stringify(rn) ",%0" : : "r" (v))

#define mfmsr()		({unsigned int rval; \
			asm volatile("mfmsr %0" : "=r" (rval)); rval;})
#define mtmsr(v)	asm volatile("mtmsr %0" : : "r" (v))

#define mfspr(rn)	({unsigned int rval; \
			asm volatile("mfspr %0," stringify(rn) \
				     : "=r" (rval)); rval;})
#define mtspr(rn, v)	asm volatile("mtspr " stringify(rn) ",%0" : : "r" (v))

/* Segment Registers */

#define SR0	0
#define SR1	1
#define SR2	2
#define SR3	3
#define SR4	4
#define SR5	5
#define SR6	6
#define SR7	7
#define SR8	8
#define SR9	9
#define SR10	10
#define SR11	11
#define SR12	12
#define SR13	13
#define SR14	14
#define SR15	15

#ifndef __ASSEMBLY__
#ifndef CONFIG_MACH_SPECIFIC
extern int _machine;
extern int have_of;
#endif /* CONFIG_MACH_SPECIFIC */

/* what kind of prep workstation we are */
extern int _prep_type;
/*
 * This is used to identify the board type from a given PReP board
 * vendor. Board revision is also made available.
 */
extern unsigned char ucSystemType;
extern unsigned char ucBoardRev;
extern unsigned char ucBoardRevMaj, ucBoardRevMin;

struct task_struct;
void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
void release_thread(struct task_struct *);

/*
 * Create a new kernel thread.
 */
extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

/*
 * 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 */

/* Lazy FPU handling on uni-processor */
extern struct task_struct *last_task_used_math;
extern struct task_struct *last_task_used_altivec;

/*
 * this is the minimum allowable io space due to the location
 * of the io areas on prep (first one at 0x80000000) but
 * as soon as I get around to remapping the io areas with the BATs
 * to match the mac we can raise this. -- Cort
 */
#define TASK_SIZE	(0x80000000UL)

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)

typedef struct {
	unsigned long seg;
} mm_segment_t;

struct thread_struct {
	unsigned long	ksp;		/* Kernel stack pointer */
	unsigned long	wchan;		/* Event task is sleeping on */
	struct pt_regs	*regs;		/* Pointer to saved register state */
	mm_segment_t	fs;		/* for get_fs() validation */
	void		*pgdir;		/* root of page-table tree */
	signed long     last_syscall;
	double		fpr[32];	/* Complete floating point set */
	unsigned long	fpscr_pad;	/* fpr ... fpscr must be contiguous */
	unsigned long	fpscr;		/* Floating point status */
#ifdef CONFIG_ALTIVEC
	vector128	vr[32];		/* Complete AltiVec set */
	vector128	vscr;		/* AltiVec status */
	unsigned long	vrsave;
#endif /* CONFIG_ALTIVEC */
};

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

#define INIT_THREAD  { \
	INIT_SP, /* ksp */ \
	0, /* wchan */ \
	(struct pt_regs *)INIT_SP - 1, /* regs */ \
	KERNEL_DS, /*fs*/ \
	swapper_pg_dir, /* pgdir */ \
	0, /* last_syscall */ \
	{0}, 0, 0 \
}

/*
 * Note: the vm_start and vm_end fields here should *not*
 * be in kernel space.  (Could vm_end == vm_start perhaps?)
 */
#define INIT_MMAP { &init_mm, 0, 0x1000, NULL, \
		    PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, \
		    1, NULL, NULL }

/*
 * Return saved PC of a blocked thread. For now, this is the "user" PC
 */
static inline unsigned long thread_saved_pc(struct thread_struct *t)
{
	return (t->regs) ? t->regs->nip : 0;
}

#define copy_segments(tsk, mm)		do { } while (0)
#define release_segments(mm)		do { } while (0)
#define forget_segments()		do { } while (0)

unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  ((tsk)->thread.regs->nip)
#define KSTK_ESP(tsk)  ((tsk)->thread.regs->gpr[1])

/*
 * NOTE! The task struct and the stack go together
 */
#define THREAD_SIZE (2*PAGE_SIZE)
#define alloc_task_struct() \
	((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
#define free_task_struct(p)	free_pages((unsigned long)(p),1)
#define get_task_struct(tsk)      atomic_inc(&mem_map[MAP_NR(tsk)].count)

/* in process.c - for early bootup debug -- Cort */
int ll_printk(const char *, ...);
void ll_puts(const char *);

#define init_task	(init_task_union.task)
#define init_stack	(init_task_union.stack)

/* In misc.c */
void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);

#endif /* ndef ASSEMBLY*/

#ifdef CONFIG_MACH_SPECIFIC
#if defined(CONFIG_8xx)
#define _machine _MACH_8xx
#define have_of 0
#elif defined(CONFIG_OAK)
#define _machine _MACH_oak
#define have_of	0
#elif defined(CONFIG_WALNUT)
#define _machine _MACH_walnut
#define have_of 0
#elif defined(CONFIG_APUS)
#define _machine _MACH_apus
#define have_of 0
#elif defined(CONFIG_GEMINI)
#define _machine _MACH_gemini
#define have_of 0
#elif defined(CONFIG_8260)
#define _machine _MACH_8260
#define have_of 0
#else
#error "Machine not defined correctly"
#endif
#endif /* CONFIG_MACH_SPECIFIC */

#endif /* __ASM_PPC_PROCESSOR_H */