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- /*
- * 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 BY2XPG (4096*1024) /* bytes per big page */
- #define PGSHIFT 12 /* log(BY2PG) */
- #define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1))
- #define PGROUND(s) ROUND(s, BY2PG)
- #define CACHELINESZ 32 /* pentium & later */
- #define BLOCKALIGN 8
- #define MAXMACH 1 /* max # cpus system can run */
- /*
- * we use a larger-than-normal kernel stack in the bootstraps as we have
- * significant arrays (buffers) on the stack. we typically consume about
- * 4.5K of stack.
- */
- #define KSTACK (4*BY2PG) /* Size of kernel stack */
- #define MACHSIZE BY2PG
- /*
- * Time
- */
- #define HZ (100) /* clock frequency */
- #define MS2HZ (1000/HZ) /* millisec per clock tick */
- #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
- /*
- * Address spaces
- *
- * Kernel is at 2GB-4GB
- */
- #define KZERO 0x80000000 /* base of kernel address space */
- #define KSEGM 0xF0000000
- #define VPT (KZERO-VPTSIZE)
- #define VPTSIZE BY2XPG
- #define NVPT (VPTSIZE/BY2WD)
- #define KMAP (VPT-KMAPSIZE)
- #define KMAPSIZE BY2XPG
- #define VMAP (KMAP-VMAPSIZE)
- #define VMAPSIZE (0x10000000-VPTSIZE-KMAPSIZE)
- #define UZERO 0 /* base of user address space */
- #define UTZERO (UZERO+BY2PG) /* first address in user text */
- #define USTKTOP (VMAP-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 /* pages in new stack; limits exec args */
- /*
- * Fundamental addresses - bottom 64kB saved for return to real mode
- *
- * we need some fixed address space for things that normally fit below the
- * kernel and some of it needs to be addressible from real mode, thus under 1MB.
- *
- * pxe loading starts us at 0x7c00 and non-pxe loading starts us at 0x10000.
- *
- * this assertion must hold: PDX(TMPADDR) == PDX(MACHADDR).
- * see realmode0.s for a description of the Chinese puzzle.
- */
- /* first 1K is real-mode IVT (vectors) */
- /* next 256 bytes are bios data area (bda) */
- /* 0x500 to 0x800 unused [768] */
- /*
- * RMCODE should be the lowest address used in real mode.
- * all real-mode buffers, etc. should follow it.
- */
- #define RMCODE (KZERO+0x800) /* copy of initial KTZERO [2K, magic] */
- #define REBOOTADDR (RMCODE-KZERO) /* reboot code - physical address [128] */
- #define RMSIZE 2048
- /* 0x1000 to 0x1200 unused [512] */
- /* CONFADDR must match def'n in kernel being loaded */
- #define CONFADDR (KZERO+0x1200) /* cfg passed to kernel [3.5K, fixed] */
- #define BIOSXCHG (KZERO+0x2000) /* BIOS data exchange [2K+32] */
- /* 0x2820 to 0x2900 unused [224] */
- #define RMUADDR (KZERO+0x2900) /* real mode Ureg [128 (76 actual)] */
- /* 0x2980 to 0x3000 unused [1664] */
- #define IDTADDR (KZERO+0x3000) /* protected-mode idt [2K] */
- /* 0x3800 to 0x4000 unused [2K] */
- /* we only use one processor for bootstrapping, so merge MACHADDR & CPU0MACH */
- #define MACHADDR (KZERO+0x4000) /* as seen by current processor */
- #define CPU0MACH MACHADDR /* Mach for bootstrap processor */
- #define CPU0GDT (KZERO+0x5000) /* bootstrap processor GDT after Mach */
- #define TMPADDR (KZERO+0x6000) /* used for temporary mappings */
- /* 0x7000—0x7800 unused [2K], could be extra real-mode stack */
- #define PXEBASE 0x7c00 /* pxe loads us here */
- #define RMSTACK PXEBASE /* real phys. stack base [1K below] */
- #define PBSBASE 0x10000 /* pbs loads us here (at 64K) */
- /*
- * we used to use 9boot's `end', rounded up, but that was when the boot loader
- * was in the first 640K; now end is up around 10MB (at least for 9boot).
- * various machines nibble away at the top of the lowest 640K.
- */
- #define BIOSTABLES (512*1024)
- // #define BIOSTABLES (600*1024) /* fails on amd64 */
- // #define BIOSTABLES 0x3800 /* 2K: fails on amd64 */
- #define Bootkernaddr (9*MB) /* where to put decompressed boot kernel */
- #define Bootkernmax (4*MB) /* max size */
- #define Unzipbuf (13*MB)
- #define Mallocbase (16*MB)
- /*
- * MemMin is what the bootstrap code in l*.s has already mapped;
- * MemMax is the limit of physical memory to scan.
- */
- #define MemMin (20*MB) /* don't have PTEs for more allocated yet */
- #define MemMax (512*MB) /* allow for huge 10gbe buffers */
- #define Lowmemsz (640*KB)
- #define LOWPTEPAGES (MemMin / (4*MB))
- #define Kernelmax (8*MB) /* max size of real kernel, not an address */
- /*
- * 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 KESEG16 9 /* kernel executable 16-bit */
- #define NGDT 10 /* 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)
- #define KDSEL SELECTOR(KDSEG, SELGDT, 0)
- #define KESEL SELECTOR(KESEG, SELGDT, 0)
- #define UESEL SELECTOR(UESEG, SELGDT, 3)
- #define UDSEL SELECTOR(UDSEG, SELGDT, 3)
- #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) */
- /*
- * 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))
- /*
- * 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)
- /* CR0 */
- #define PG 0x80000000
- /*
- * Macros for calculating offsets within the page directory base
- * and page tables.
- */
- #define PDX(va) ((((ulong)(va))>>22) & 0x03FF)
- #define PTX(va) ((((ulong)(va))>>12) & 0x03FF)
- #define getpgcolor(a) 0
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