1991/0614/pc/mem.h (diff list | history)

1991/0614/sys/src/9/pc/mem.h:1,57 – 1991/0625/sys/src/9/pc/mem.h:1,75 (short | long | prev | next)
1991/0613		#define SELGDT (0<<3) /* selector is in gdt */ #define SELLDT (1<<3) /* selector is in ldt */
1991/0625		/* * Memory and machine-specific definitions. Used in C and assembler. */
1991/0613		#define SELECTOR(i, t, p) (((i)<<4) | (t) | (p))
1991/0625		/* * Sizes */
1991/0613
1991/0625		#define BI2BY 8 /* bits per byte */ #define BI2WD 32 /* bits per word */ #define BY2WD 4 /* bytes per word */ #define BY2PG 4096 /* bytes per page */ #define WD2PG (BY2PG/BY2WD) /* words per page */ #define PGSHIFT 13 /* log(BY2PG) */ #define PGROUND(s) (((s)+(BY2PG-1))&~(BY2PG-1)) #define MAXMACH 1 /* max # cpus system can run */
1991/0613		/* * segment descriptor/gate
1991/0625		* Time (???) * Clock frequency is 68.3900 HZ
1991/0613		*/ typedef struct Segdesc Segdesc; struct Segdesc { ulong d0; ulong d1; }; #define SEGDATA (0x10<<8) /* data/stack segment */ #define SEGEXEC (0x18<<8) /* executable segment */ #define SEGCG (0x0C<<8) /* call gate */ #define SEGIG (0x0E<<8) /* interrupt gate */ #define SEGTG (0x0F<<8) /* task gate */ #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) */
1991/0625		#define HZ (68) /* clock frequency */ #define MS2HZ (1000/HZ) /* millisec per clock tick */ #define TK2SEC(t) ((t)*100/6839) /* ticks to seconds */ #define TK2MS(t) ((((ulong)(t))*100000)/6839) /* ticks to milliseconds */ #define MS2TK(t) ((((ulong)(t))*6839)/100000) /* milliseconds to ticks */
1991/0613		/* * gate initializers
1991/0625		* Fundamental addresses
1991/0613		*/ #define TRAPGATE(s,o,p) { (o)&0xFFFF0000|SEGP|SEGPL(p)|SEGTG, (o)&0xFFFF|((s)<<16) } #define INTRGATE(s,o,p) { (o)&0xFFFF0000|SEGP|SEGPL(p)|SEGIG, (o)&0xFFFF|((s)<<16) } #define CALLGATE(s,o,p) { (o)&0xFFFF0000|SEGP|SEGPL(p)|SEGCG, (o)&0xFFFF|((s)<<16) }
1991/0625		#define USERADDR 0xC0000000 #define UREGADDR (USERADDR+BY2PG-4*16)
1991/0613		/* * segment descriptor initializers
1991/0625		* Address spaces * * User is at 0-2GB * Kernel is at 2GB-4GB
1991/0613		*/
1991/0614		#define DATASEG(p) { SEGG|SEGB|(0xF<<16)|SEGP|SEGPL(p)|SEGDATA|SEGW, 0xFFFF }
1991/0613		#define EXECSEG(p) { SEGG|SEGD|(0xF<<16)|SEGP|SEGPL(p)|SEGEXEC|SEGR, 0xFFFF }
1991/0625		#define UZERO 0 /* base of user address space */ #define UTZERO (UZERO+BY2PG) /* first address in user text */ #define TSTKTOP USERADDR /* end of new stack in sysexec */ #define TSTKSIZ 10 #define USTKTOP (TSTKTOP-TSTKSIZ*BY2PG) /* byte just beyond user stack */ #define KZERO 0x80000000 /* base of kernel address space */ #define KTZERO KZERO /* first address in kernel text */ #define USTKSIZE (4*1024*1024) /* size of user stack */ #define MACHSIZE 4096 #define isphys(x) ((x)&KZERO)
1991/0613		/* * known segments (in GDT) and their selectors */ enum { NULLSEG=0, /* null segment */ KESEG= 1, /* kernel executable */ KDSEG= 2, /* kernel data/stack */ UESEG= 3, /* user executable */ UDSEG= 4, /* user data/stack */ SYSGATE=5, /* system call gate */ };
1991/0625		#define NULLSEG 0 /* null segment */ #define KESEG 1 /* kernel executable */ #define KDSEG 2 /* kernel data/stack */ #define UESEG 3 /* user executable */ #define UDSEG 4 /* user data/stack */ #define SYSGATE 5 /* system call gate */ #define SELGDT (0<<3) /* selector is in gdt */ #define SELLDT (1<<3) /* selector is in ldt */ #define SELECTOR(i, t, p) (((i)<<4) | (t) | (p))
1991/0613		#define NULLSEL SELECTOR(NULLSEG, SELGDT, 0) #define KESEL SELECTOR(KESEG, SELGDT, 0) #define KDSEL SELECTOR(KDSEG, SELGDT, 0)
1991/0614/sys/src/9/pc/mem.h:60,99 – 1991/0625/sys/src/9/pc/mem.h:78,80
1991/0613		#define UDSEL SELECTOR(UDSEG, SELGDT, 3) #define USSEL SELECTOR(UDSEG, SELGDT, 3) /* * task state segment. Plan 9 ignores all the task switching goo and just * uses the tss for esp0 and ss0 on gate's into the kernel, interrupts, * and exceptions. The rest is completely ignored. * * This means that we only need one tss in the whole system. */ typedef struct Tss Tss; struct Tss { ulong backlink; /* unused */ ulong esp0; /* pl0 stack pointer */ ulong ss0; /* pl0 stack selector */ ulong esp1; /* pl1 stack pointer */ ulong ss1; /* pl1 stack selector */ ulong esp2; /* pl2 stack pointer */ ulong ss2; /* pl2 stack selector */ ulong cr3; /* page table descriptor */ ulong eip; /* instruction pointer */ ulong eflags; /* processor flags */ ulong eax; /* general (hah?) registers */ ulong ecx; ulong edx; ulong ebx; ulong esp; ulong ebp; ulong esi; ulong edi; ulong es; /* segment selectors */ ulong cs; ulong ss; ulong ds; ulong fs; ulong gs; ulong ldt; /* local descriptor table */ ulong iomap; /* io map base */ };