#ifndef __ASM_PPC_PROCESSOR_H
#define __ASM_PPC_PROCESSOR_H

#include <linux/config.h>


/* Bit encodings for Machine State Register (MSR) */
#define MSR_POW		(1<<18)		/* Enable Power Management */
#define MSR_TGPR	(1<<17)		/* TLB Update registers in use */
#define MSR_ILE		(1<<16)		/* Interrupt Little-Endian enable */
#define MSR_EE		(1<<15)		/* External Interrupt enable */
#define MSR_PR		(1<<14)		/* Supervisor/User privilege */
#define MSR_FP		(1<<13)		/* Floating Point enable */
#define MSR_ME		(1<<12)		/* Machine Check enable */
#define MSR_FE0		(1<<11)		/* Floating Exception mode 0 */
#define MSR_SE		(1<<10)		/* Single Step */
#define MSR_BE		(1<<9)		/* Branch Trace */
#define MSR_FE1		(1<<8)		/* Floating Exception mode 1 */
#define MSR_IP		(1<<6)		/* Exception prefix 0x000/0xFFF */
#define MSR_IR		(1<<5)		/* Instruction MMU enable */
#define MSR_DR		(1<<4)		/* Data MMU enable */
#define MSR_RI		(1<<1)		/* Recoverable Exception */
#define MSR_LE		(1<<0)		/* Little-Endian enable */

#define MSR_		MSR_FE0|MSR_FE1|MSR_ME
#define MSR_KERNEL      MSR_|MSR_IR|MSR_DR
#define MSR_USER	MSR_FE0|MSR_FE1|MSR_ME|MSR_PR|MSR_EE|MSR_IR|MSR_DR

/* Bit encodings for Hardware Implementation Register (HID0) */
#define HID0_EMCP	(1<<31)		/* Enable Machine Check pin */
#define HID0_EBA	(1<<29)		/* Enable Bus Address Parity */
#define HID0_EBD	(1<<28)		/* Enable Bus Data Parity */
#define HID0_SBCLK	(1<<27)
#define HID0_EICE	(1<<26)
#define HID0_ECLK	(1<<25)
#define HID0_PAR	(1<<24)
#define HID0_DOZE	(1<<23)
#define HID0_NAP	(1<<22)
#define HID0_SLEEP	(1<<21)
#define HID0_DPM	(1<<20)
#define HID0_ICE	(1<<15)		/* Instruction Cache Enable */
#define HID0_DCE	(1<<14)		/* Data Cache Enable */
#define HID0_ILOCK	(1<<13)		/* Instruction Cache Lock */
#define HID0_DLOCK	(1<<12)		/* Data Cache Lock */
#define HID0_ICFI	(1<<11)		/* Instruction Cache Flash Invalidate */
#define HID0_DCI	(1<<10)		/* Data Cache Invalidate */
#define HID0_SIED	(1<<7)		/* Serial Instruction Execution [Disable] */
#define HID0_BHTE	(1<<2)		/* Branch History Table Enable */
/* fpscr settings */
#define FPSCR_FX        (1<<31)
#define FPSCR_FEX       (1<<30)

#ifndef __ASSEMBLY__
/*
 * PowerPC machine specifics
 */
extern inline void start_thread(struct pt_regs *, unsigned long, unsigned long );

/*
 * 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 */

/*
 * Write Protection works right in supervisor mode on the PowerPC
 */
#define wp_works_ok 1
#define wp_works_ok__is_a_macro /* for versions in ksyms.c */

#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 / 3)
struct thread_struct 
{
	unsigned long	ksp;		/* Kernel stack pointer */
	unsigned long	*pg_tables;	/* MMU information */
#ifdef CONFIG_PMAC
	unsigned long	last_pc;	/* PC when last entered system */
	unsigned long	user_stack;	/* [User] Stack when entered kernel */
#endif  
	unsigned long	fpscr_pad;	/* (so we can save fpscr with stfd) */
	unsigned long   fpscr;		/* fp status reg */
	double       	fpr[32];	/* Complete floating point set */
	unsigned long   fp_used;
	unsigned long	wchan;		/* Event task is sleeping on */
	struct pt_regs  *regs;		/* Pointer to saved register state */
	unsigned long   fs;		/* for get_fs() validation */
	signed long     last_syscall;
	unsigned long   pad[2];	/* pad to 16-byte boundry */
};

/* Points to the thread_struct of the thread (if any) which
   currently owns the FPU. */
#define fpu_tss (&(last_task_used_math->tss))

#ifdef CONFIG_PMAC
#define LAZY_TSS_FPR_INIT 0,0,0,0,{0},
#endif
#ifdef CONFIG_PREP
#define LAZY_TSS_FPR_INIT 0,0,{0},
#endif

#define INIT_TSS  { \
	sizeof(init_stack) + (long) &init_stack, /* ksp */ \
	(long *)swapper_pg_dir, /* pg_tables */ \
	LAZY_TSS_FPR_INIT \
	0, /*fp_used*/ 0, /*wchan*/ \
	sizeof(init_stack) + (long)&init_stack - \
		sizeof(struct pt_regs), /* regs */ \
	KERNEL_DS /*fs*/, 0 /*last_syscall*/ \
}

#define INIT_MMAP { &init_mm, KERNELBASE/*0*/, 0xffffffff/*0x40000000*/, \
		      PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC }

/*
 * 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;
	/*return (t->last_pc);*/
}

extern int _machine;
#define _MACH_Motorola 0
#define _MACH_IBM      1
#define _MACH_Be       2
#define _MACH_Pmac     3

/*
 * NOTE! The task struct and the stack go together
 */
#define alloc_task_struct() \
	((struct task_struct *) __get_free_pages(GFP_KERNEL,1,0))
#define free_task_struct(p)	free_pages((unsigned long)(p),1)

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

#endif /* ndef ASSEMBLY*/

#define init_task	(init_task_union.task)
#define init_stack	(init_task_union.stack)
  
#endif /* __ASM_PPC_PROCESSOR_H */
