ref: 6ddbe25d19bfa5a8c305e9e4292fa3ed0d24426a
dir: /sys/src/9/xen/mem.h/
/* * 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 PGSHIFT 12 /* log(BY2PG) */ #define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1)) #define PGROUND(s) ROUND(s, BY2PG) #define BLOCKALIGN 8 #define FPalign 16 /* required for FXSAVE */ #define MAXMACH 8 /* max # cpus system can run */ #define MAX_VIRT_CPUS MAXMACH #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 */ /* * Fundamental addresses */ #define REBOOTADDR 0x00001000 /* reboot code - physical address */ #define APBOOTSTRAP 0x80001000 /* AP bootstrap code */ #define MACHADDR 0x80002000 /* as seen by current processor */ #define CPU0MACH MACHADDR /* Mach for bootstrap processor */ #define XENCONSOLE 0x80003000 /* xen console ring */ #define XENSHARED 0x80004000 /* xen shared page */ #define XENBUS 0x80005000 /* xenbus aka xenstore ring */ #define XENGRANTTAB 0x80006000 /* grant table */ #define MACHSIZE BY2PG /* * Address spaces * * User is at 0-2GB * Kernel is at 2GB-4GB */ #define UZERO 0 /* base of user address space */ #define UTZERO (UZERO+BY2PG) /* first address in user text */ #define UTROUND(t) ROUNDUP((t), BY2PG) #define KZERO 0x80000000 /* base of kernel address space */ #define KTZERO 0x80010000 /* first address in kernel text */ #define USTKTOP (KZERO-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 /* * 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 PROCSEG0 11 /* per process descriptor0 */ #define NPROCSEG 3 /* number of per process descriptors */ #define NGDT 13 /* 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) /* these are replaced by XEN entries */ #ifdef NOPE // XXX investigate more #define KDSEL SELECTOR(KDSEG, SELGDT, 0) #define KESEL SELECTOR(KESEG, SELGDT, 0) #define UESEL SELECTOR(UESEG, SELGDT, 3) #define UDSEL SELECTOR(UDSEG, SELGDT, 3) /* comment out to make sure unused ... */ #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) */ #else /* use the selectors that xen gives us */ #define KESEL FLAT_KERNEL_CS #define KDSEL FLAT_KERNEL_DS #define UESEL FLAT_USER_CS #define UDSEL FLAT_USER_DS #endif /* * 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)) #define PGOFF(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 PAX(va) (paemode? ((ulong)(va)>>29) & 0x6 : 0) #define PDX(va) (paemode? (((ulong)(va))>>20) & 0x03FE : (((ulong)(va))>>22) & 0x03FF) #define PTX(va) (paemode? (((ulong)(va))>>11) & 0x03FE : (((ulong)(va))>>12) & 0x03FF) #define PDB(pdb,va) (paemode? KADDR(MAPPN((pdb)[((ulong)(va)>>29) & 0x6])) : pdb) #define getpgcolor(a) 0