/* * Memory and machine-specific definitions.  Used in C and assembler. */ /* * Sizes */#define	BI2BY		8			/* bits per byte */#define	BI2WD		32			/* bits per word */#define	BY2WD		4			/* bytes per word */#define	BY2PG		4096			/* bytes per page */#define	WD2PG		(BY2PG/BY2WD)		/* words per page */#define	PGSHIFT		12			/* log(BY2PG) */#define	PGROUND(s)	(((s)+(BY2PG-1))&~(BY2PG-1))#define CACHELINESZ	32			/* pentium & later */ #define	MAXMACH		1			/* max # cpus system can run */ /* * Time */// #define	HZ		100				/* clock frequency *//* 1000Hz for *9loadfakeintrs */#define	HZ		1000				/* clock frequency */#define	MS2HZ		(1000/HZ)			/* millisec per clock tick */#define	TK2SEC(t)	((t)/HZ)			/* ticks to seconds */#define	TK2MS(x)	((x)*(1000/HZ))#define	MS2TK(t)	((((ulong)(t))*HZ)/1000)	/* milliseconds to ticks */ /* * Fundamental addresses *//* edd says BDA (bios data area) is at 40:00 = 0x400 - 0x500 */#define IDTADDR		0x80000800		/* idt */#define APBOOTSTRAP	0x80001000		/* AP bootstrap code */#define CONFADDR	0x80001200		/* info passed from boot loader */#define CPU0PDB		0x80002000		/* bootstrap processor PDB */#define CPU0PTE		0x80003000		/* bootstrap processor PTE's for 0-4MB */#define MACHADDR	0x80004000 /* as seen by current processor (unused by boot) */#define CPU0MACH	0x80005000		/* Mach for bootstrap processor */#define BIOSXCHG	0x80006000		/* To exchange data with the BIOS */#define	MACHSIZE	(BY2PG*8)		/* stack size */ /* *  Address spaces * *  Kernel is at 2GB-4GB */#define	KZERO		0x80000000		/* base of kernel address space */#define	KTZERO		KZERO			/* first address in kernel text */#define ROMBIOS		(KZERO|0xF0000) /* *  known 80386 segments (in GDT) and their selectors */#define	NULLSEG	0	/* null segment */#define	KDSEG	1	/* kernel data/stack */#define	KESEG	2	/* kernel executable */	#define	UDSEG	3	/* user data/stack */#define	UESEG	4	/* user executable */#define	SYSGATE	5	/* system call gate */#define TSSSEG	6	/* task segment */ #define SELGDT	(0<<3)	/* selector is in gdt */#define	SELLDT	(1<<3)	/* selector is in ldt */ #define SELECTOR(i, t, p)	(((i)<<3) | (t) | (p)) #define NULLSEL	SELECTOR(NULLSEG, SELGDT, 0)#define KESEL	SELECTOR(KESEG, SELGDT, 0)#define KDSEL	SELECTOR(KDSEG, SELGDT, 0)#define UESEL	SELECTOR(UESEG, SELGDT, 3)#define UDSEL	SELECTOR(UDSEG, SELGDT, 3)#define TSSSEL	SELECTOR(TSSSEG, SELGDT, 0) /* *  fields in segment descriptors */#define SEGDATA	(0x10<<8)	/* data/stack segment */#define SEGEXEC	(0x18<<8)	/* executable segment */#define	SEGTSS	(0x9<<8)	/* TSS segment */#define SEGCG	(0x0C<<8)	/* call gate */#define	SEGIG	(0x0E<<8)	/* interrupt gate */#define SEGTG	(0x0F<<8)	/* task gate */#define SEGTYPE	(0x1F<<8) #define SEGP	(1<<15)		/* segment present */#define SEGPL(x) ((x)<<13)	/* priority level */#define SEGB	(1<<22)		/* granularity 1==4k (for expand-down) */#define SEGG	(1<<23)		/* granularity 1==4k (for other) */#define SEGE	(1<<10)		/* expand down */#define SEGW	(1<<9)		/* writable (for data/stack) */#define	SEGR	(1<<9)		/* readable (for code) */#define SEGD	(1<<22)		/* default 1==32bit (for code) */ /* *  virtual MMU */#define PTEMAPMEM	(1024*1024)	/* ??? */	#define SEGMAPSIZE	16		/* ??? */#define	PTEPERTAB	(PTEMAPMEM/BY2PG)	/* ??? */#define PPN(x)		((x)&~(BY2PG-1)) /* *  physical MMU */#define	PTEVALID	(1<<0)#define	PTEUNCACHED	0		/* everything is uncached */#define	PTEWRITE	(1<<1)#define	PTERONLY	(0<<1)#define	PTEKERNEL	(0<<2)#define	PTEUSER		(1<<2)#define	PTESIZE		(1<<7) /* *  flag register bits that we care about */#define IFLAG	0x200