ref: 53d55013598d7cd214d01cbf0b026844fe7ca8d2
dir: /sys/src/9/pc64/mem.h/
/* * Memory and machine-specific definitions. Used in C and assembler. */ #define KiB 1024u /* Kibi 0x0000000000000400 */ #define MiB 1048576u /* Mebi 0x0000000000100000 */ #define GiB 1073741824u /* Gibi 000000000040000000 */ #define TiB 1099511627776ull /* Tebi 0x0000010000000000 */ #define PiB 1125899906842624ull /* Pebi 0x0004000000000000 */ #define EiB 1152921504606846976ull /* Exbi 0x1000000000000000 */ #define MIN(a, b) ((a) < (b)? (a): (b)) #define MAX(a, b) ((a) > (b)? (a): (b)) #define ALIGNED(p, a) (!(((uintptr)(p)) & ((a)-1))) /* * Sizes */ #define BI2BY 8 /* bits per byte */ #define BI2WD 32 /* bits per word */ #define BY2WD 8 /* bytes per word */ #define BY2V 8 /* bytes per double word */ #define BY2PG (0x1000ull) /* bytes per page */ #define WD2PG (BY2PG/BY2WD) /* words per 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 FPalign 64 #define MAXMACH 128 /* max # cpus system can run */ #define KSTACK (8*KiB) /* Size of Proc 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. User: */ #define UTZERO (0x0000000000200000ull) /* first address in user text */ #define UADDRMASK (0x00007fffffffffffull) /* canonical address mask */ #define USTKTOP (0x00007ffffffff000ull) #define USTKSIZE (16*MiB) /* size of user stack */ /* * Address spaces. Kernel, sorted by address. */ #define KZERO (0xffffffff80000000ull) #define KTZERO (KZERO+1*MiB+64*KiB) #define VMAP (0xfffffe8000000000ull) #define VMAPSIZE (1024ull*GiB) #define KMAP (0xfffffe0000000000ull) #define KMAPSIZE (2*MiB) /* * Fundamental addresses */ #define CONFADDR (KZERO+0x1200ull) /* info passed from boot loader */ #define APBOOTSTRAP (KZERO+0x7000ull) /* AP bootstrap code */ #define IDTADDR (KZERO+0x10000ull) /* idt */ #define REBOOTADDR (0x11000) /* reboot code - physical address */ #define CPU0PML4 (KZERO+0x13000ull) #define CPU0PDP (KZERO+0x14000ull) #define CPU0PD0 (KZERO+0x15000ull) /* KZERO */ #define CPU0PD1 (KZERO+0x16000ull) /* KZERO+1GB */ #define CPU0GDT (KZERO+0x17000ull) /* bootstrap processor GDT */ #define CPU0MACH (KZERO+0x18000ull) /* Mach for bootstrap processor */ #define CPU0END (CPU0MACH+MACHSIZE) #define MACHSIZE (2*KSTACK) /* * Where configuration info is left for the loaded programme. * There are 24064 bytes available at CONFADDR. */ #define BOOTLINE ((char*)CONFADDR) #define BOOTLINELEN 64 #define BOOTARGS ((char*)(CONFADDR+BOOTLINELEN)) #define BOOTARGSLEN (0x6000-0x200-BOOTLINELEN) /* * known x86 segments (in GDT) and their selectors */ #define NULLSEG 0 /* null segment */ #define KESEG 1 /* kernel executable */ #define KDSEG 2 /* kernel data */ #define UE32SEG 3 /* user executable 32bit */ #define UDSEG 4 /* user data/stack */ #define UESEG 5 /* user executable 64bit */ #define TSSSEG 8 /* task segment (two descriptors) */ #define NGDT 10 /* number of GDT entries required */ #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 NULLSEL #define KESEL SELECTOR(KESEG, SELGDT, 0) #define UE32SEL SELECTOR(UE32SEG, SELGDT, 3) #define UDSEL SELECTOR(UDSEG, SELGDT, 3) #define UESEL SELECTOR(UESEG, SELGDT, 3) #define TSSSEL SELECTOR(TSSSEG, 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 SEGLDT (0x02<<8) /* local descriptor table */ #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 SEGD (1<<22) /* default 1==32bit (for code) */ #define SEGE (1<<10) /* expand down */ #define SEGW (1<<9) /* writable (for data/stack) */ #define SEGR (1<<9) /* readable (for code) */ #define SEGL (1<<21) /* 64 bit */ #define SEGG (1<<23) /* granularity 1==4k (for other) */ /* * virtual MMU */ #define PTEMAPMEM (1ull*MiB) #define PTEPERTAB (PTEMAPMEM/BY2PG) #define SEGMAPSIZE 65536 #define SSEGMAPSIZE 16 #define PPN(x) ((x)&~(1ull<<63 | BY2PG-1)) /* * physical MMU */ #define PTEVALID (1ull<<0) #define PTEWT (1ull<<3) #define PTEUNCACHED (1ull<<4) #define PTECACHED (0ull<<4) #define PTEWRITE (1ull<<1) #define PTERONLY (0ull<<1) #define PTEKERNEL (0ull<<2) #define PTEUSER (1ull<<2) #define PTESIZE (1ull<<7) #define PTEGLOBAL (1ull<<8) #define PTENOEXEC ((uvlong)m->havenx<<63) /* * Hierarchical Page Tables. * For example, traditional IA-32 paging structures have 2 levels, * level 1 is the PD, and level 0 the PT pages; with IA-32e paging, * level 3 is the PML4(!), level 2 the PDP, level 1 the PD, * and level 0 the PT pages. The PTLX macro gives an index into the * page-table page at level 'l' for the virtual address 'v'. */ #define PTSZ (4*KiB) /* page table page size */ #define PTSHIFT 9 /* */ #define PTLX(v, l) (((v)>>(((l)*PTSHIFT)+PGSHIFT)) & ((1<<PTSHIFT)-1)) #define PGLSZ(l) (1ull<<(((l)*PTSHIFT)+PGSHIFT)) #define getpgcolor(a) 0 /* PAT entry used for write combining */ #define PATWC 7 #define RMACH R15 /* m-> */ #define RUSER R14 /* up-> */