#define BY2WD 4 /* bytes per word */
#define BY2V 8 /* bytes per vlong */
#define BY2PG 4096 /* bytes per page */
#define PGSHIFT 12 /* log(BY2PG) */
#define PGROUND(s) (((s)+(BY2PG-1))&~(BY2PG-1))
#define MB (1024*1024)
#define HZ (82) /* clock frequency */
#define TK2MS(t) (((ulong)(t)*1000)/HZ) /* ticks to milliseconds - beware rounding */
#define MS2TK(t) (((ulong)(t)*HZ)/1000) /* milliseconds to ticks - beware rounding */
#define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
/*
* Fundamental addresses
*/
/*
* KZERO == 0 or 0x80000000 will work fine. 0x10000000 will work but limit
* usable memory to 256MB.
*/
#define KZERO 0x80000000 /* base of kernel address space */
#define KTZERO (KZERO+0x100000) /* first address in kernel text */
#define IDTADDR (KZERO+0x800) /* idt */
#define APBOOTSTRAP (KZERO+0x1000) /* AP bootstrap code */
#define CONFADDR (KZERO+0x1200) /* info passed from boot loader */
#define CPU0PDB (KZERO+0x2000) /* bootstrap processor PDB */
#define CPU0PTE (KZERO+0x3000) /* bootstrap processor PTE's for 0-2MB */
#define CPU0MACHPTE (KZERO+0x4000) /* bootstrap processor PTE for MACHADDR */
#define CPU0MACH (KZERO+0x5000) /* Mach for bootstrap processor */
#define MACHSIZE 4096
/*
* 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 TSSSEG 5 /* task segment */
#define N386SEG 6 /* number of segments */
#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) */
/*
* physical MMU
*/
#define PTEVALID (1<<0)
#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 MACHADDR ((ulong)&mach0) /* hack number 1 */
#define IFLAG 0x200 /* psw: interrupt enable, to be accurate */
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