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 */
63 * known x86 segments (in GDT) and their selectors
64 * using the selectors that xen gives us.
66 #define KESEL FLAT_KERNEL_CS
67 #define KDSEL FLAT_KERNEL_DS
68 #define UESEL FLAT_USER_CS
69 #define UDSEL FLAT_USER_DS
71 #define NPROCSEG 1 /* number of per process descriptors */
76 #define PTEMAPMEM (1024*1024)
77 #define PTEPERTAB (PTEMAPMEM/BY2PG)
78 #define SEGMAPSIZE 1984
79 #define SSEGMAPSIZE 16
80 #define PPN(x) ((x)&~(BY2PG-1))
81 #define PGOFF(x) ((x)&(BY2PG-1))
86 #define PTEVALID (1<<0)
88 #define PTEUNCACHED (1<<4)
89 #define PTECACHED (0<<4)
90 #define PTEWRITE (1<<1)
91 #define PTERONLY (0<<1)
92 #define PTEKERNEL (0<<2)
93 #define PTEUSER (1<<2)
94 #define PTESIZE (1<<7)
95 #define PTEGLOBAL (1<<8)
98 * Macros for calculating offsets within the page directory base
101 #define PAX(va) (paemode? ((ulong)(va)>>29) & 0x6 : 0)
102 #define PDX(va) (paemode? (((ulong)(va))>>20) & 0x03FE : (((ulong)(va))>>22) & 0x03FF)
103 #define PTX(va) (paemode? (((ulong)(va))>>11) & 0x03FE : (((ulong)(va))>>12) & 0x03FF)
104 #define PDB(pdb,va) (paemode? KADDR(MAPPN((pdb)[((ulong)(va)>>29) & 0x6])) : pdb)
106 #define getpgcolor(a) 0