108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Memory and machine-specific definitions. Used in C and assembler.
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*/
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#define MIN(a, b) ((a) < (b)? (a): (b))
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#define MAX(a, b) ((a) > (b)? (a): (b))
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/*
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* Sizes
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*/
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#define BI2BY 8 /* bits per byte */
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#define BI2WD 32 /* bits per word */
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#define BY2WD 4 /* bytes per word */
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#define BY2V 8 /* bytes per double word */
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#define BY2PG 4096 /* bytes per page */
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#define WD2PG (BY2PG/BY2WD) /* words per page */
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#define PGSHIFT 12 /* log(BY2PG) */
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#define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1))
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#define PGROUND(s) ROUND(s, BY2PG)
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#define BLOCKALIGN 8
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#define FPalign 16 /* required for FXSAVE */
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#define MAXMACH 8 /* max # cpus system can run */
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#define MAX_VIRT_CPUS MAXMACH
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#define KSTACK 4096 /* Size of kernel stack */
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/*
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* Time
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*/
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#define HZ (100) /* clock frequency */
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#define MS2HZ (1000/HZ) /* millisec per clock tick */
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#define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
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/*
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* Fundamental addresses
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*/
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#define REBOOTADDR 0x00001000 /* reboot code - physical address */
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#define APBOOTSTRAP 0x80001000 /* AP bootstrap code */
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#define MACHADDR 0x80002000 /* as seen by current processor */
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#define CPU0MACH MACHADDR /* Mach for bootstrap processor */
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#define XENCONSOLE 0x80003000 /* xen console ring */
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#define XENSHARED 0x80004000 /* xen shared page */
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#define XENBUS 0x80005000 /* xenbus aka xenstore ring */
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#define XENGRANTTAB 0x80006000 /* grant table */
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#define MACHSIZE BY2PG
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/*
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* Address spaces
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*
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* User is at 0-2GB
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* Kernel is at 2GB-4GB
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*/
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#define UZERO 0 /* base of user address space */
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#define UTZERO (UZERO+BY2PG) /* first address in user text */
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#define UTROUND(t) ROUNDUP((t), BY2PG)
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#define KZERO 0x80000000 /* base of kernel address space */
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#define KTZERO 0x80010000 /* first address in kernel text */
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#define USTKTOP (KZERO-BY2PG) /* byte just beyond user stack */
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#define USTKSIZE (16*1024*1024) /* size of user stack */
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#define TSTKTOP (USTKTOP-USTKSIZE) /* end of new stack in sysexec */
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#define TSTKSIZ 100
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/*
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* known x86 segments (in GDT) and their selectors
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* using the selectors that xen gives us.
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*/
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#define KESEL FLAT_KERNEL_CS
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#define KDSEL FLAT_KERNEL_DS
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#define UESEL FLAT_USER_CS
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#define UDSEL FLAT_USER_DS
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#define NPROCSEG 1 /* number of per process descriptors */
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/*
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* virtual MMU
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*/
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#define PTEMAPMEM (1024*1024)
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#define PTEPERTAB (PTEMAPMEM/BY2PG)
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#define SEGMAPSIZE 1984
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#define SSEGMAPSIZE 16
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#define PPN(x) ((x)&~(BY2PG-1))
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#define PGOFF(x) ((x)&(BY2PG-1))
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/*
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* physical MMU
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*/
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#define PTEVALID (1<<0)
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#define PTEWT (1<<3)
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#define PTEUNCACHED (1<<4)
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#define PTEWRITE (1<<1)
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#define PTERONLY (0<<1)
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#define PTEKERNEL (0<<2)
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#define PTEUSER (1<<2)
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#define PTESIZE (1<<7)
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#define PTEGLOBAL (1<<8)
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/*
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* Macros for calculating offsets within the page directory base
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* and page tables.
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*/
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#define PAX(va) (paemode? ((ulong)(va)>>29) & 0x6 : 0)
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#define PDX(va) (paemode? (((ulong)(va))>>20) & 0x03FE : (((ulong)(va))>>22) & 0x03FF)
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#define PTX(va) (paemode? (((ulong)(va))>>11) & 0x03FE : (((ulong)(va))>>12) & 0x03FF)
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#define PDB(pdb,va) (paemode? KADDR(MAPPN((pdb)[((ulong)(va)>>29) & 0x6])) : pdb)
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#define getpgcolor(a) 0
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