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- /*
- * Memory and machine-specific definitions. Used in C and assembler.
- */
- #define MIN(a, b) ((a) < (b)? (a): (b))
- #define MAX(a, b) ((a) > (b)? (a): (b))
- /*
- * Sizes
- */
- #define BI2BY 8 /* bits per byte */
- #define BI2WD 32 /* bits per word */
- #define BY2WD 4 /* bytes per word */
- #define BY2V 8 /* bytes per double word */
- #define BY2PG 4096 /* bytes per page */
- #define WD2PG (BY2PG/BY2WD) /* words per page */
- #define BY2XPG (4096*1024) /* bytes per big page */
- #define PGSHIFT 12 /* log(BY2PG) */
- #define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1))
- #define PGROUND(s) ROUND(s, BY2PG)
- #define BLOCKALIGN 8
- #define MAXMACH 24 /* max # cpus system can run */
- #define KSTACK 4096 /* Size of kernel stack */
- /*
- * Time
- */
- #define HZ (100) /* clock frequency */
- #define MS2HZ (1000/HZ) /* millisec per clock tick */
- #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
- /*
- * Address spaces
- */
- #define KZERO 0xF0000000 /* base of kernel address space */
- #define KTZERO (KZERO+0x100000) /* first address in kernel text - 9load sits below */
- #define VPT (KZERO-VPTSIZE)
- #define VPTSIZE BY2XPG
- #define NVPT (VPTSIZE/BY2WD)
- #define KMAP (VPT-KMAPSIZE)
- #define KMAPSIZE BY2XPG
- #define VMAP (KMAP-VMAPSIZE)
- #define VMAPSIZE (0x10000000-VPTSIZE-KMAPSIZE)
- #define UZERO 0 /* base of user address space */
- #define UTZERO (UZERO+BY2PG) /* first address in user text */
- #define USTKTOP (VMAP-BY2PG) /* byte just beyond user stack */
- #define USTKSIZE (16*1024*1024) /* size of user stack */
- #define TSTKTOP (USTKTOP-USTKSIZE) /* end of new stack in sysexec */
- #define TSTKSIZ 100 /* pages in new stack; limits exec args */
- /*
- * Fundamental addresses - bottom 64kB saved for return to real mode
- */
- #define CONFADDR (KZERO+0x1200) /* info passed from boot loader */
- #define TMPADDR (KZERO+0x2000) /* used for temporary mappings */
- #define APBOOTSTRAP (KZERO+0x3000) /* AP bootstrap code */
- #define RMUADDR (KZERO+0x7C00) /* real mode Ureg */
- #define RMCODE (KZERO+0x8000) /* copy of first page of KTEXT */
- #define RMBUF (KZERO+0x9000) /* buffer for user space - known to vga */
- #define IDTADDR (KZERO+0x10800) /* idt */
- #define REBOOTADDR (0x11000) /* reboot code - physical address */
- #define CPU0PDB (KZERO+0x12000) /* bootstrap processor PDB */
- #define CPU0PTE (KZERO+0x13000) /* bootstrap processor PTE's for 0-4MB */
- #define CPU0GDT (KZERO+0x14000) /* bootstrap processor GDT */
- #define MACHADDR (KZERO+0x15000) /* as seen by current processor */
- #define CPU0MACH (KZERO+0x16000) /* Mach for bootstrap processor */
- #define MACHSIZE BY2PG
- #define CPU0PTE1 (KZERO+0x17000) /* bootstrap processor PTE's for 4MB-8MB */
- #define CPU0END (CPU0PTE1+BY2PG)
- /*
- * N.B. ramscan knows that CPU0END is the end of reserved data
- * N.B. _startPADDR knows that CPU0PDB is the first reserved page
- * and that there are 6 of them.
- */
- /*
- * known x86 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 APMCSEG 6 /* APM code segment */
- #define APMCSEG16 7 /* APM 16-bit code segment */
- #define APMDSEG 8 /* APM data segment */
- #define KESEG16 9 /* kernel executable 16-bit */
- #define NGDT 10 /* number of GDT entries required */
- /* #define APM40SEG 8 /* APM segment 0x40 */
- #define SELGDT (0<<2) /* selector is in gdt */
- #define SELLDT (1<<2) /* selector is in ldt */
- #define SELECTOR(i, t, p) (((i)<<3) | (t) | (p))
- #define NULLSEL SELECTOR(NULLSEG, SELGDT, 0)
- #define KDSEL SELECTOR(KDSEG, SELGDT, 0)
- #define KESEL SELECTOR(KESEG, SELGDT, 0)
- #define UESEL SELECTOR(UESEG, SELGDT, 3)
- #define UDSEL SELECTOR(UDSEG, SELGDT, 3)
- #define TSSSEL SELECTOR(TSSSEG, SELGDT, 0)
- #define APMCSEL SELECTOR(APMCSEG, SELGDT, 0)
- #define APMCSEL16 SELECTOR(APMCSEG16, SELGDT, 0)
- #define APMDSEL SELECTOR(APMDSEG, SELGDT, 0)
- /* #define APM40SEL SELECTOR(APM40SEG, 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) /* trap 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) */
- /*
- * virtual MMU
- */
- #define PTEMAPMEM (1024*1024)
- #define PTEPERTAB (PTEMAPMEM/BY2PG)
- #define SEGMAPSIZE 1984
- #define SSEGMAPSIZE 16
- #define PPN(x) ((x)&~(BY2PG-1))
- /*
- * physical MMU
- */
- #define PTEVALID (1<<0)
- #define PTEWT (1<<3)
- #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 PTEGLOBAL (1<<8)
- /*
- * Macros for calculating offsets within the page directory base
- * and page tables.
- */
- #define PDX(va) ((((ulong)(va))>>22) & 0x03FF)
- #define PTX(va) ((((ulong)(va))>>12) & 0x03FF)
- #define getpgcolor(a) 0
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