1 /* 2 * Memory and machine-specific definitions. Used in C and assembler. 3 */ 4 5 /* 6 * Sizes 7 */ 8 #define BI2BY 8 /* bits per byte */ 9 #define BI2WD 32 /* bits per word */ 10 #define BY2WD 4 /* bytes per word */ 11 #define BY2V 8 /* bytes per double word */ 12 #define BY2PG 4096 /* bytes per page */ 13 #define WD2PG (BY2PG/BY2WD) /* words per page */ 14 #define BY2XPG (4096*1024) /* bytes per big page */ 15 #define PGSHIFT 12 /* log(BY2PG) */ 16 #define CACHELINESZ 32 /* pentium & later */ 17 #define BLOCKALIGN 8 18 #define FPalign 16 /* required for FXSAVE */ 19 20 /* 21 * In 32-bit mode, the MAXMACH limit is 32 without 22 * changing the way active.machs is defined and used 23 * (unfortunately, it is also used in the port code). 24 */ 25 #define MAXMACH 32 /* max # cpus system can run */ 26 #define KSTACK 4096 /* Size of kernel stack */ 27 28 /* 29 * Time 30 */ 31 #define HZ (100) /* clock frequency */ 32 #define MS2HZ (1000/HZ) /* millisec per clock tick */ 33 #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */ 34 35 /* 36 * Address spaces 37 */ 38 #define KZERO 0xF0000000 /* base of kernel address space */ 39 #define KTZERO (KZERO+0x100000) /* first address in kernel text - 9load sits below */ 40 #define VPT (KZERO-VPTSIZE) 41 #define VPTSIZE BY2XPG 42 #define NVPT (VPTSIZE/BY2WD) 43 #define KMAP (VPT-KMAPSIZE) 44 #define KMAPSIZE BY2XPG 45 #define VMAP (KMAP-VMAPSIZE) 46 #define VMAPSIZE (0x10000000-VPTSIZE-KMAPSIZE) 47 #define UZERO 0 /* base of user address space */ 48 #define UTZERO (UZERO+BY2PG) /* first address in user text */ 49 #define UTROUND(t) ROUNDUP((t), BY2PG) 50 #define USTKTOP (VMAP-BY2PG) /* byte just beyond user stack */ 51 #define USTKSIZE (16*1024*1024) /* size of user stack */ 52 #define TSTKTOP (USTKTOP-USTKSIZE) /* end of new stack in sysexec */ 53 #define TSTKSIZ 100 /* pages in new stack; limits exec args */ 54 55 /* 56 * Fundamental addresses - bottom 64kB saved for return to real mode 57 */ 58 #define CONFADDR (KZERO+0x1200) /* info passed from boot loader */ 59 #define TMPADDR (KZERO+0x2000) /* used for temporary mappings */ 60 #define APBOOTSTRAP (KZERO+0x3000) /* AP bootstrap code */ 61 #define RMUADDR (KZERO+0x7C00) /* real mode Ureg */ 62 #define RMCODE (KZERO+0x8000) /* copy of first page of KTEXT */ 63 #define RMBUF (KZERO+0x9000) /* buffer for user space - known to vga */ 64 #define IDTADDR (KZERO+0x10800) /* idt */ 65 #define REBOOTADDR (0x11000) /* reboot code - physical address */ 66 #define CPU0PDB (KZERO+0x12000) /* bootstrap processor PDB */ 67 #define CPU0PTE (KZERO+0x13000) /* bootstrap processor PTE's for 0-4MB */ 68 #define CPU0GDT (KZERO+0x14000) /* bootstrap processor GDT */ 69 #define MACHADDR (KZERO+0x15000) /* as seen by current processor */ 70 #define CPU0MACH (KZERO+0x16000) /* Mach for bootstrap processor */ 71 #define MACHSIZE BY2PG 72 #define CPU0PTE1 (KZERO+0x17000) /* bootstrap processor PTE's for 4MB-8MB */ 73 #define CPU0END (CPU0PTE1+BY2PG) 74 /* 75 * N.B. ramscan knows that CPU0END is the end of reserved data 76 * N.B. _startPADDR knows that CPU0PDB is the first reserved page 77 * and that there are 6 of them. 78 */ 79 80 /* 81 * known x86 segments (in GDT) and their selectors 82 */ 83 #define NULLSEG 0 /* null segment */ 84 #define KDSEG 1 /* kernel data/stack */ 85 #define KESEG 2 /* kernel executable */ 86 #define UDSEG 3 /* user data/stack */ 87 #define UESEG 4 /* user executable */ 88 #define TSSSEG 5 /* task segment */ 89 #define APMCSEG 6 /* APM code segment */ 90 #define APMCSEG16 7 /* APM 16-bit code segment */ 91 #define APMDSEG 8 /* APM data segment */ 92 #define KESEG16 9 /* kernel executable 16-bit */ 93 #define NGDT 10 /* number of GDT entries required */ 94 /* #define APM40SEG 8 /* APM segment 0x40 */ 95 96 #define SELGDT (0<<2) /* selector is in gdt */ 97 #define SELLDT (1<<2) /* selector is in ldt */ 98 99 #define SELECTOR(i, t, p) (((i)<<3) | (t) | (p)) 100 101 #define NULLSEL SELECTOR(NULLSEG, SELGDT, 0) 102 #define KDSEL SELECTOR(KDSEG, SELGDT, 0) 103 #define KESEL SELECTOR(KESEG, SELGDT, 0) 104 #define UESEL SELECTOR(UESEG, SELGDT, 3) 105 #define UDSEL SELECTOR(UDSEG, SELGDT, 3) 106 #define TSSSEL SELECTOR(TSSSEG, SELGDT, 0) 107 #define APMCSEL SELECTOR(APMCSEG, SELGDT, 0) 108 #define APMCSEL16 SELECTOR(APMCSEG16, SELGDT, 0) 109 #define APMDSEL SELECTOR(APMDSEG, SELGDT, 0) 110 /* #define APM40SEL SELECTOR(APM40SEG, SELGDT, 0) */ 111 112 /* 113 * fields in segment descriptors 114 */ 115 #define SEGDATA (0x10<<8) /* data/stack segment */ 116 #define SEGEXEC (0x18<<8) /* executable segment */ 117 #define SEGTSS (0x9<<8) /* TSS segment */ 118 #define SEGCG (0x0C<<8) /* call gate */ 119 #define SEGIG (0x0E<<8) /* interrupt gate */ 120 #define SEGTG (0x0F<<8) /* trap gate */ 121 #define SEGTYPE (0x1F<<8) 122 123 #define SEGP (1<<15) /* segment present */ 124 #define SEGPL(x) ((x)<<13) /* priority level */ 125 #define SEGB (1<<22) /* granularity 1==4k (for expand-down) */ 126 #define SEGG (1<<23) /* granularity 1==4k (for other) */ 127 #define SEGE (1<<10) /* expand down */ 128 #define SEGW (1<<9) /* writable (for data/stack) */ 129 #define SEGR (1<<9) /* readable (for code) */ 130 #define SEGD (1<<22) /* default 1==32bit (for code) */ 131 132 /* 133 * virtual MMU 134 */ 135 #define PTEMAPMEM (1024*1024) 136 #define PTEPERTAB (PTEMAPMEM/BY2PG) 137 #define SEGMAPSIZE 1984 138 #define SSEGMAPSIZE 16 139 #define PPN(x) ((x)&~(BY2PG-1)) 140 141 /* 142 * physical MMU 143 */ 144 #define PTEVALID (1<<0) 145 #define PTEWT (1<<3) 146 #define PTEUNCACHED (1<<4) 147 #define PTEWRITE (1<<1) 148 #define PTERONLY (0<<1) 149 #define PTEKERNEL (0<<2) 150 #define PTEUSER (1<<2) 151 #define PTESIZE (1<<7) 152 #define PTEGLOBAL (1<<8) 153 154 /* 155 * Macros for calculating offsets within the page directory base 156 * and page tables. 157 */ 158 #define PDX(va) ((((ulong)(va))>>22) & 0x03FF) 159 #define PTX(va) ((((ulong)(va))>>12) & 0x03FF) 160 161 #define getpgcolor(a) 0 162 163