/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * 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	BY2V		8			/* bytes per double word */#define	BY2PG		4096			/* bytes per page */#define	WD2PG		(BY2PG/BY2WD)		/* words per page */#define	BY2XPG		(4096*1024)		/* bytes per big page */#define	PGSHIFT		12			/* log(BY2PG) */#define CACHELINESZ	32			/* pentium & later */#define	BLOCKALIGN	8 #define	MAXMACH		1			/* max # cpus system can run *//* * we use a larger-than-normal kernel stack in the bootstraps as we have * significant arrays (buffers) on the stack.  we typically consume about * 4.5K of stack. */#define KSTACK		(4*BY2PG)		/* Size of kernel stack */#define MACHSIZE	BY2PG /* * Time */#define	HZ		(100)			/* clock frequency */#define	MS2HZ		(1000/HZ)		/* millisec per clock tick */#define	TK2SEC(t)	((t)/HZ)		/* ticks to seconds */ /* *  Address spaces * *  Kernel is at 2GB-4GB */#define	KZERO		0x80000000		/* base of kernel address space */#define	KSEGM		0xF0000000#define	VPT		(KZERO-VPTSIZE)#define	VPTSIZE		BY2XPG#define	NVPT		(VPTSIZE/BY2WD)#define	KMAP		(VPT-KMAPSIZE)#define	KMAPSIZE	BY2XPG#define	VMAP		(KMAP-VMAPSIZE)#define	VMAPSIZE	(0x10000000-VPTSIZE-KMAPSIZE)#define	UZERO		0			/* base of user address space */#define	UTZERO		(UZERO+BY2PG)		/* first address in user text */#define UTROUND(t)	ROUNDUP((t), BY2PG)#define	USTKTOP		(VMAP-BY2PG)		/* byte just beyond user stack */#define	USTKSIZE	(16*1024*1024)		/* size of user stack */#define	TSTKTOP		(USTKTOP-USTKSIZE)	/* end of new stack in sysexec */#define	TSTKSIZ 	100			/* pages in new stack; limits exec args */ /* * Fundamental addresses - bottom 64kB saved for return to real mode * * we need some fixed address space for things that normally fit below the * kernel and some of it needs to be addressible from real mode, thus under 1MB. * * pxe loading starts us at 0x7c00 and non-pxe loading starts us at 0x10000. * * this assertion must hold: PDX(TMPADDR) == PDX(MACHADDR). * see realmode0.s for a description of the Chinese puzzle. *//* first 1K is real-mode IVT (vectors) *//* next 256 bytes are bios data area (bda) *//* 0x500 to 0x800 unused [768] *//* * RMCODE should be the lowest address used in real mode. * all real-mode buffers, etc. should follow it. */#define RMCODE		(KZERO+0x800)	/* copy of initial KTZERO [2K, magic] */#define	REBOOTADDR	(RMCODE-KZERO)	/* reboot code - physical address [128] */#define RMSIZE		2048/* 0x1000 to 0x1200 unused [512] *//* CONFADDR must match def'n in kernel being loaded */#define	CONFADDR	(KZERO+0x1200)	/* cfg passed to kernel [3.5K, fixed] */#define BIOSXCHG	(KZERO+0x2000)	/* BIOS data exchange [2K+32] *//* 0x2820 to 0x2900 unused [224] */#define	RMUADDR		(KZERO+0x2900)	/* real mode Ureg [128 (76 actual)] *//* 0x2980 to 0x3000 unused [1664] */#define IDTADDR		(KZERO+0x3000)	/* protected-mode idt [2K] *//* 0x3800 to 0x4000 unused [2K] */ /* we only use one processor for bootstrapping, so merge MACHADDR & CPU0MACH */#define	MACHADDR	(KZERO+0x4000)	/* as seen by current processor */#define	CPU0MACH	MACHADDR	/* Mach for bootstrap processor */#define	CPU0GDT		(KZERO+0x5000)	/* bootstrap processor GDT after Mach */#define	TMPADDR		(KZERO+0x6000)	/* used for temporary mappings *//* 0x7000—0x7800 unused [2K], could be extra real-mode stack */#define PXEBASE 	0x7c00		/* pxe loads us here */#define RMSTACK 	PXEBASE		/* real phys. stack base [1K below] */#define PBSBASE		0x10000		/* pbs loads us here (at 64K) */ /* * we used to use 9boot's `end', rounded up, but that was when the boot loader * was in the first 640K; now end is up around 10MB (at least for 9boot). * various machines nibble away at the top of the lowest 640K. */#define BIOSTABLES	(512*1024)// #define BIOSTABLES	(600*1024)	/* fails on amd64 */// #define BIOSTABLES	0x3800		/* 2K: fails on amd64 */ #define Bootkernaddr	(9*MB)	/* where to put decompressed boot kernel */#define Bootkernmax	(4*MB)	/* max size */#define Unzipbuf	(13*MB)#define Mallocbase	(16*MB)/* * MemMin is what the bootstrap code in l*.s has already mapped; * MemMax is the limit of physical memory to scan. */#define MemMin		(20*MB)	/* don't have PTEs for more allocated yet */#define MemMax		(512*MB) /* allow for huge 10gbe buffers */ #define Lowmemsz	(640*KB) #define LOWPTEPAGES	(MemMin / (4*MB)) #define Kernelmax	(8*MB)	/* max size of real kernel, not an address */ /* *  known x86 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	TSSSEG	5	/* task segment */#define	APMCSEG		6	/* APM code segment */#define	APMCSEG16	7	/* APM 16-bit code segment */#define	APMDSEG		8	/* APM data segment */#define	KESEG16		9	/* kernel executable 16-bit */#define	NGDT		10	/* number of GDT entries required *//* #define	APM40SEG	8	/* APM segment 0x40 */ #define	SELGDT	(0<<2)	/* selector is in gdt */#define	SELLDT	(1<<2)	/* selector is in ldt */ #define	SELECTOR(i, t, p)	(((i)<<3) | (t) | (p)) #define	NULLSEL	SELECTOR(NULLSEG, SELGDT, 0)#define	KDSEL	SELECTOR(KDSEG, SELGDT, 0)#define	KESEL	SELECTOR(KESEG, SELGDT, 0)#define	UESEL	SELECTOR(UESEG, SELGDT, 3)#define	UDSEL	SELECTOR(UDSEG, SELGDT, 3)#define	TSSSEL	SELECTOR(TSSSEG, SELGDT, 0)#define	APMCSEL 	SELECTOR(APMCSEG, SELGDT, 0)#define	APMCSEL16	SELECTOR(APMCSEG16, SELGDT, 0)#define	APMDSEL		SELECTOR(APMDSEG, SELGDT, 0)/* #define	APM40SEL	SELECTOR(APM40SEG, 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)	/* trap 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	PTEPERTAB	(PTEMAPMEM/BY2PG)#define	SEGMAPSIZE	1984#define	SSEGMAPSIZE	16#define	PPN(x)		((x)&~(BY2PG-1)) /* *  physical MMU */#define	PTEVALID	(1<<0)#define	PTEWT		(1<<3)#define	PTEUNCACHED	(1<<4)#define	PTEWRITE	(1<<1)#define	PTERONLY	(0<<1)#define	PTEKERNEL	(0<<2)#define	PTEUSER		(1<<2)#define	PTESIZE		(1<<7)#define	PTEGLOBAL	(1<<8) /* CR0 */#define PG	0x80000000 /* * Macros for calculating offsets within the page directory base * and page tables.  */#define	PDX(va)		((((ulong)(va))>>22) & 0x03FF)#define	PTX(va)		((((ulong)(va))>>12) & 0x03FF) #define	getpgcolor(a)	0