ref: b502a62da2ec6058923db94f87ecc2d29db2fa77
dir: /os/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 0x0000000040000000 */ #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 (32*KiB) /* Size of kernel stack */ #define MACHSIZE (2*KSTACK) /* * Time */ #define HZ (100) /* clock frequency */ #define MS2HZ (1000/HZ) /* millisec per clock tick */ #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */ #define MS2TK(t) ((((uintptr)(t))*HZ)/1000) /* milliseconds to ticks */ /* * Address spaces. Kernel, sorted by address. */ #define KZERO (0) /* with identity mapping, KZERO = 0 */ /* Leave the 1st MiB to the BIOS (0 to 1MiB-1) * From the first MiB to KTZERO is used by the global data tables * acid expects plan9 userspace program text at 2MiB. So, having KTZERO at 2MiB * 1MiB for l.s data structures (1 to 2MiB-1) */ #define KDZERO (0x100000) #define KTZERO (0x200000) #define VMAPSIZE (512ull*GiB) /* * Fundamental addresses */ #define CONFADDR (0x1200ull) /* info passed from boot loader */ #define REBOOTADDR (0x11000ull) /* reboot code - physical address */ #define APBOOTSTRAP (KDZERO+ 0x7000ull) /* AP bootstrap code */ #define IDTADDR (KDZERO+0x10000ull) /* idt */ #define GDTADDR (KDZERO+0x11000ull) /* gdt */ #define CPU0MACH (KDZERO+0x12000ull) /* Mach for bootstrap processor */ #define CPU0END (KDZERO+0x22000ull) /* CPU0MACH + (MACHSIZE = 64 KiB = 0x10 000) */ /* MACHSIZE includes stack size */ #define CPU0SP (KDZERO+0x22000ull) /* 1 PD table has 512 entries * each entry maps to a 2MB page * 512 entries maps 1GiB and occupies 512*8 = 4096 bytes */ #define PML4ADDR (KDZERO+0x23000ull) #define PDPADDR (KDZERO+0x24000ull) #define PD0ADDR (KDZERO+0x25000ull) /* KZERO=0 .. 1GiB */ #define PT0ADDR (KDZERO+0x26000ull) /* KZERO=0 .. 2MiB */ #define PT1ADDR (KDZERO+0x27000ull) /* 2MiB .. 4MiB */ #define PT2ADDR (KDZERO+0x28000ull) /* 4MiB .. 6MiB */ #define PT3ADDR (KDZERO+0x29000ull) /* 6MiB .. 8MiB */ /* fill with page tables until KTZERO */ /* * Where configuration info is left for us by 9boot. * (e.g. why parse the .ini file twice?). * 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 SELECTOR(KDSEG, SELGDT, 0) #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)) /* * Macros for calculating offsets within the page directory base * and page tables. */ #define PDX(va) ((((uintptr)(va))>>22) & 0x03FF) #define PTX(va) ((((uintptr)(va))>>12) & 0x03FF) #define getpgcolor(a) 0 /* PAT entry used for write combining */ #define PATWC 7 #define RMACH R15 /* m-> */ #define RUSER R14 /* up-> */