2 * Memory and machine-specific definitions. Used in C and assembler.
5 #define MIN(a, b) ((a) < (b)? (a): (b))
6 #define MAX(a, b) ((a) > (b)? (a): (b))
11 #define BI2BY 8 /* bits per byte */
12 #define BI2WD 32 /* bits per word */
13 #define BY2WD 4 /* bytes per word */
14 #define BY2V 8 /* bytes per double word */
15 #define BY2PG 4096 /* bytes per page */
16 #define WD2PG (BY2PG/BY2WD) /* words per page */
17 #define PGSHIFT 12 /* log(BY2PG) */
18 #define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1))
19 #define PGROUND(s) ROUND(s, BY2PG)
21 #define FPalign 16 /* required for FXSAVE */
23 #define MAXMACH 8 /* max # cpus system can run */
24 #define MAX_VIRT_CPUS MAXMACH
25 #define KSTACK 4096 /* Size of kernel stack */
30 #define HZ (100) /* clock frequency */
31 #define MS2HZ (1000/HZ) /* millisec per clock tick */
32 #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
35 * Fundamental addresses
37 #define REBOOTADDR 0x00001000 /* reboot code - physical address */
38 #define APBOOTSTRAP 0x80001000 /* AP bootstrap code */
39 #define MACHADDR 0x80002000 /* as seen by current processor */
40 #define CPU0MACH MACHADDR /* Mach for bootstrap processor */
41 #define XENCONSOLE 0x80003000 /* xen console ring */
42 #define XENSHARED 0x80004000 /* xen shared page */
43 #define XENBUS 0x80005000 /* xenbus aka xenstore ring */
44 #define XENGRANTTAB 0x80006000 /* grant table */
46 #define MACHSIZE BY2PG
52 * Kernel is at 2GB-4GB
54 #define UZERO 0 /* base of user address space */
55 #define UTZERO (UZERO+BY2PG) /* first address in user text */
56 #define UTROUND(t) ROUNDUP((t), BY2PG)
57 #define KZERO 0x80000000 /* base of kernel address space */
58 #define KTZERO 0x80010000 /* first address in kernel text */
59 #define USTKTOP (KZERO-BY2PG) /* byte just beyond user stack */
60 #define USTKSIZE (16*1024*1024) /* size of user stack */
61 #define TSTKTOP (USTKTOP-USTKSIZE) /* end of new stack in sysexec */
65 * known x86 segments (in GDT) and their selectors
67 #define NULLSEG 0 /* null segment */
68 #define KDSEG 1 /* kernel data/stack */
69 #define KESEG 2 /* kernel executable */
70 #define UDSEG 3 /* user data/stack */
71 #define UESEG 4 /* user executable */
72 #define TSSSEG 5 /* task segment */
73 #define APMCSEG 6 /* APM code segment */
74 #define APMCSEG16 7 /* APM 16-bit code segment */
75 #define APMDSEG 8 /* APM data segment */
76 #define PROCSEG0 11 /* per process descriptor0 */
77 #define NPROCSEG 3 /* number of per process descriptors */
78 #define NGDT 13 /* number of GDT entries required */
79 /* #define APM40SEG 8 /* APM segment 0x40 */
81 #define SELGDT (0<<2) /* selector is in gdt */
82 #define SELLDT (1<<2) /* selector is in ldt */
84 #define SELECTOR(i, t, p) (((i)<<3) | (t) | (p))
86 #define NULLSEL SELECTOR(NULLSEG, SELGDT, 0)
87 /* these are replaced by XEN entries */
88 #ifdef NOPE // XXX investigate more
89 #define KDSEL SELECTOR(KDSEG, SELGDT, 0)
90 #define KESEL SELECTOR(KESEG, SELGDT, 0)
91 #define UESEL SELECTOR(UESEG, SELGDT, 3)
92 #define UDSEL SELECTOR(UDSEG, SELGDT, 3)
93 /* comment out to make sure unused ... */
95 #define TSSSEL SELECTOR(TSSSEG, SELGDT, 0)
96 #define APMCSEL SELECTOR(APMCSEG, SELGDT, 0)
97 #define APMCSEL16 SELECTOR(APMCSEG16, SELGDT, 0)
98 #define APMDSEL SELECTOR(APMDSEG, SELGDT, 0)
99 /* #define APM40SEL SELECTOR(APM40SEG, SELGDT, 0) */
101 /* use the selectors that xen gives us */
102 #define KESEL FLAT_KERNEL_CS
103 #define KDSEL FLAT_KERNEL_DS
104 #define UESEL FLAT_USER_CS
105 #define UDSEL FLAT_USER_DS
109 * fields in segment descriptors
111 #define SEGDATA (0x10<<8) /* data/stack segment */
112 #define SEGEXEC (0x18<<8) /* executable segment */
113 #define SEGTSS (0x9<<8) /* TSS segment */
114 #define SEGCG (0x0C<<8) /* call gate */
115 #define SEGIG (0x0E<<8) /* interrupt gate */
116 #define SEGTG (0x0F<<8) /* trap gate */
117 #define SEGTYPE (0x1F<<8)
119 #define SEGP (1<<15) /* segment present */
120 #define SEGPL(x) ((x)<<13) /* priority level */
121 #define SEGB (1<<22) /* granularity 1==4k (for expand-down) */
122 #define SEGG (1<<23) /* granularity 1==4k (for other) */
123 #define SEGE (1<<10) /* expand down */
124 #define SEGW (1<<9) /* writable (for data/stack) */
125 #define SEGR (1<<9) /* readable (for code) */
126 #define SEGD (1<<22) /* default 1==32bit (for code) */
131 #define PTEMAPMEM (1024*1024)
132 #define PTEPERTAB (PTEMAPMEM/BY2PG)
133 #define SEGMAPSIZE 1984
134 #define SSEGMAPSIZE 16
135 #define PPN(x) ((x)&~(BY2PG-1))
136 #define PGOFF(x) ((x)&(BY2PG-1))
141 #define PTEVALID (1<<0)
143 #define PTEUNCACHED (1<<4)
144 #define PTEWRITE (1<<1)
145 #define PTERONLY (0<<1)
146 #define PTEKERNEL (0<<2)
147 #define PTEUSER (1<<2)
148 #define PTESIZE (1<<7)
149 #define PTEGLOBAL (1<<8)
152 * Macros for calculating offsets within the page directory base
155 #define PAX(va) (paemode? ((ulong)(va)>>29) & 0x6 : 0)
156 #define PDX(va) (paemode? (((ulong)(va))>>20) & 0x03FE : (((ulong)(va))>>22) & 0x03FF)
157 #define PTX(va) (paemode? (((ulong)(va))>>11) & 0x03FE : (((ulong)(va))>>12) & 0x03FF)
158 #define PDB(pdb,va) (paemode? KADDR(MAPPN((pdb)[((ulong)(va)>>29) & 0x6])) : pdb)
160 #define getpgcolor(a) 0