2 * Memory and machine-specific definitions. Used in C and assembler.
8 #define BI2BY 8 /* bits per byte */
9 #define BI2WD 32 /* bits per word */
10 #define BY2WD 4 /* bytes per word */
11 #define BY2PG 4096 /* bytes per page */
12 #define WD2PG (BY2PG/BY2WD) /* words per page */
13 #define PGSHIFT 12 /* log(BY2PG) */
14 #define PGROUND(s) (((s)+(BY2PG-1))&~(BY2PG-1))
16 #define MAXMACH 1 /* max # cpus system can run */
21 #define HZ (100) /* clock frequency */
22 #define MS2HZ (1000/HZ) /* millisec per clock tick */
23 #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
24 #define TK2MS(x) ((x)*(1000/HZ))
25 #define MS2TK(t) ((((ulong)(t))*HZ)/1000) /* milliseconds to ticks */
28 * Fundamental addresses
30 #define IDTADDR 0x80000800 /* idt */
31 #define APBOOTSTRAP 0x80001000 /* AP bootstrap code */
32 #define CONFADDR 0x80001200 /* info passed from boot loader */
33 #define CPU0PDB 0x80002000 /* bootstrap processor PDB */
34 #define CPU0PTE 0x80003000 /* bootstrap processor PTE's for 0-4MB */
35 #define MACHADDR 0x80004000 /* as seen by current processor */
36 #define CPU0MACH 0x80005000 /* Mach for bootstrap processor */
37 #define BIOSXCHG 0x80006000 /* To exchange data with the BIOS */
38 #define MACHSIZE (BY2PG*8) /* stack size */
43 * Kernel is at 2GB-4GB
45 #define KZERO 0x80000000 /* base of kernel address space */
46 #define KTZERO KZERO /* first address in kernel text */
47 #define ROMBIOS (KZERO|0xF0000)
50 * known 80386 segments (in GDT) and their selectors
52 #define NULLSEG 0 /* null segment */
53 #define KDSEG 1 /* kernel data/stack */
54 #define KESEG 2 /* kernel executable */
55 #define UDSEG 3 /* user data/stack */
56 #define UESEG 4 /* user executable */
57 #define SYSGATE 5 /* system call gate */
58 #define TSSSEG 6 /* task segment */
60 #define SELGDT (0<<3) /* selector is in gdt */
61 #define SELLDT (1<<3) /* selector is in ldt */
63 #define SELECTOR(i, t, p) (((i)<<3) | (t) | (p))
65 #define NULLSEL SELECTOR(NULLSEG, SELGDT, 0)
66 #define KESEL SELECTOR(KESEG, SELGDT, 0)
67 #define KDSEL SELECTOR(KDSEG, SELGDT, 0)
68 #define UESEL SELECTOR(UESEG, SELGDT, 3)
69 #define UDSEL SELECTOR(UDSEG, SELGDT, 3)
70 #define TSSSEL SELECTOR(TSSSEG, SELGDT, 0)
73 * fields in segment descriptors
75 #define SEGDATA (0x10<<8) /* data/stack segment */
76 #define SEGEXEC (0x18<<8) /* executable segment */
77 #define SEGTSS (0x9<<8) /* TSS segment */
78 #define SEGCG (0x0C<<8) /* call gate */
79 #define SEGIG (0x0E<<8) /* interrupt gate */
80 #define SEGTG (0x0F<<8) /* task gate */
81 #define SEGTYPE (0x1F<<8)
83 #define SEGP (1<<15) /* segment present */
84 #define SEGPL(x) ((x)<<13) /* priority level */
85 #define SEGB (1<<22) /* granularity 1==4k (for expand-down) */
86 #define SEGG (1<<23) /* granularity 1==4k (for other) */
87 #define SEGE (1<<10) /* expand down */
88 #define SEGW (1<<9) /* writable (for data/stack) */
89 #define SEGR (1<<9) /* readable (for code) */
90 #define SEGD (1<<22) /* default 1==32bit (for code) */
95 #define PTEMAPMEM (1024*1024) /* ??? */
96 #define SEGMAPSIZE 16 /* ??? */
97 #define PTEPERTAB (PTEMAPMEM/BY2PG) /* ??? */
98 #define PPN(x) ((x)&~(BY2PG-1))
103 #define PTEVALID (1<<0)
104 #define PTEUNCACHED 0 /* everything is uncached */
105 #define PTEWRITE (1<<1)
106 #define PTERONLY (0<<1)
107 #define PTEKERNEL (0<<2)
108 #define PTEUSER (1<<2)
109 #define PTESIZE (1<<7)
112 * flag register bits that we care about