165 lines
5.4 KiB
C
165 lines
5.4 KiB
C
/*
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* Memory and machine-specific definitions. Used in C and assembler.
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*/
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#define MIN(a, b) ((a) < (b)? (a): (b))
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#define MAX(a, b) ((a) > (b)? (a): (b))
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/*
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* Sizes
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*/
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#define BI2BY 8 /* bits per byte */
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#define BI2WD 32 /* bits per word */
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#define BY2WD 4 /* bytes per word */
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#define BY2V 8 /* bytes per double word */
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#define BY2PG 4096 /* bytes per page */
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#define WD2PG (BY2PG/BY2WD) /* words per page */
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#define BY2XPG (4096*1024) /* bytes per big page */
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#define PGSHIFT 12 /* log(BY2PG) */
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#define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1))
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#define PGROUND(s) ROUND(s, BY2PG)
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#define BLOCKALIGN 8
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/*
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* In 32-bit mode, the MAXMACH limit is 32 without
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* changing the way active.machs is defined and used
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* (unfortunately, it is also used in the port code).
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*/
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#define MAXMACH 32 /* max # cpus system can run */
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#define KSTACK 4096 /* Size of kernel stack */
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/*
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* Time
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*/
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#define HZ (100) /* clock frequency */
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#define MS2HZ (1000/HZ) /* millisec per clock tick */
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#define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
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/*
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* Address spaces
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*/
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#define KZERO 0xF0000000 /* base of kernel address space */
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#define KTZERO (KZERO+0x100000) /* first address in kernel text - 9load sits below */
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#define VPT (KZERO-VPTSIZE)
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#define VPTSIZE BY2XPG
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#define NVPT (VPTSIZE/BY2WD)
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#define KMAP (VPT-KMAPSIZE)
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#define KMAPSIZE BY2XPG
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#define VMAP (KMAP-VMAPSIZE)
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#define VMAPSIZE (0x10000000-VPTSIZE-KMAPSIZE)
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#define UZERO 0 /* base of user address space */
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#define UTZERO (UZERO+BY2PG) /* first address in user text */
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#define USTKTOP (VMAP-BY2PG) /* byte just beyond user stack */
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#define USTKSIZE (16*1024*1024) /* size of user stack */
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#define TSTKTOP (USTKTOP-USTKSIZE) /* end of new stack in sysexec */
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#define TSTKSIZ 100 /* pages in new stack; limits exec args */
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/*
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* Fundamental addresses - bottom 64kB saved for return to real mode
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*/
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#define CONFADDR (KZERO+0x1200) /* info passed from boot loader */
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#define TMPADDR (KZERO+0x2000) /* used for temporary mappings */
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#define APBOOTSTRAP (KZERO+0x3000) /* AP bootstrap code */
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#define IDTADDR (KZERO+0x10800) /* idt */
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#define REBOOTADDR (0x11000) /* reboot code - physical address */
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#define CPU0PDB (KZERO+0x12000) /* bootstrap processor PDB */
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#define CPU0PTE (KZERO+0x13000) /* bootstrap processor PTE's for 0-4MB */
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#define CPU0GDT (KZERO+0x14000) /* bootstrap processor GDT */
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#define MACHADDR (KZERO+0x15000) /* as seen by current processor */
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#define CPU0MACH (KZERO+0x16000) /* Mach for bootstrap processor */
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#define MACHSIZE BY2PG
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#define CPU0PTE1 (KZERO+0x17000) /* bootstrap processor PTE's for 4MB-8MB */
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#define CPU0END (CPU0PTE1+BY2PG)
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/*
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* N.B. ramscan knows that CPU0END is the end of reserved data
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* N.B. _startPADDR knows that CPU0PDB is the first reserved page
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* and that there are 6 of them.
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*/
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/*
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* known x86 segments (in GDT) and their selectors
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*/
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#define NULLSEG 0 /* null segment */
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#define KDSEG 1 /* kernel data/stack */
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#define KESEG 2 /* kernel executable */
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#define UDSEG 3 /* user data/stack */
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#define UESEG 4 /* user executable */
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#define TSSSEG 5 /* task segment */
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#define APMCSEG 6 /* APM code segment */
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#define APMCSEG16 7 /* APM 16-bit code segment */
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#define APMDSEG 8 /* APM data segment */
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#define KESEG16 9 /* kernel executable 16-bit */
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#define LDTSEG 10 /* local descriptor table */
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#define PROCSEG0 11 /* per process descriptor0 */
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#define NPROCSEG 3 /* number of per process descriptors */
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#define NGDT 14 /* number of GDT entries required */
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#define SELGDT (0<<2) /* selector is in gdt */
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#define SELLDT (1<<2) /* selector is in ldt */
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#define SELECTOR(i, t, p) (((i)<<3) | (t) | (p))
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#define NULLSEL SELECTOR(NULLSEG, SELGDT, 0)
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#define KDSEL SELECTOR(KDSEG, SELGDT, 0)
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#define KESEL SELECTOR(KESEG, SELGDT, 0)
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#define UESEL SELECTOR(UESEG, SELGDT, 3)
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#define UDSEL SELECTOR(UDSEG, SELGDT, 3)
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#define TSSSEL SELECTOR(TSSSEG, SELGDT, 0)
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#define APMCSEL SELECTOR(APMCSEG, SELGDT, 0)
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#define APMCSEL16 SELECTOR(APMCSEG16, SELGDT, 0)
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#define APMDSEL SELECTOR(APMDSEG, SELGDT, 0)
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#define LDTSEL SELECTOR(LDTSEG, SELGDT, 0)
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/*
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* fields in segment descriptors
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*/
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#define SEGDATA (0x10<<8) /* data/stack segment */
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#define SEGEXEC (0x18<<8) /* executable segment */
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#define SEGTSS (0x9<<8) /* TSS segment */
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#define SEGCG (0x0C<<8) /* call gate */
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#define SEGIG (0x0E<<8) /* interrupt gate */
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#define SEGTG (0x0F<<8) /* trap gate */
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#define SEGLDT (0x02<<8) /* local descriptor table */
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#define SEGTYPE (0x1F<<8)
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#define SEGP (1<<15) /* segment present */
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#define SEGPL(x) ((x)<<13) /* priority level */
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#define SEGB (1<<22) /* granularity 1==4k (for expand-down) */
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#define SEGG (1<<23) /* granularity 1==4k (for other) */
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#define SEGE (1<<10) /* expand down */
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#define SEGW (1<<9) /* writable (for data/stack) */
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#define SEGR (1<<9) /* readable (for code) */
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#define SEGD (1<<22) /* default 1==32bit (for code) */
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/*
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* virtual MMU
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*/
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#define PTEMAPMEM (1024*1024)
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#define PTEPERTAB (PTEMAPMEM/BY2PG)
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#define SEGMAPSIZE 1984
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#define SSEGMAPSIZE 16
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#define PPN(x) ((x)&~(BY2PG-1))
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/*
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* physical MMU
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*/
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#define PTEVALID (1<<0)
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#define PTEWT (1<<3)
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#define PTEUNCACHED (1<<4)
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#define PTEWRITE (1<<1)
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#define PTERONLY (0<<1)
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#define PTEKERNEL (0<<2)
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#define PTEUSER (1<<2)
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#define PTESIZE (1<<7)
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#define PTEGLOBAL (1<<8)
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/*
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* Macros for calculating offsets within the page directory base
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* and page tables.
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*/
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#define PDX(va) ((((ulong)(va))>>22) & 0x03FF)
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#define PTX(va) ((((ulong)(va))>>12) & 0x03FF)
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#define getpgcolor(a) 0
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