ref: 9861f1a92b373a16939fd6f3c167e5dad9f253d3
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 */ /* * known x86 segments (in GDT) and their selectors * using 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 #define NPROCSEG 1 /* number of per process descriptors */ /* * 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 PTECACHED (0<<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