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/*
* Memory and machine-specific definitions. Used in C and assembler.
*/
/*
* 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 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 UTROUND(t) ROUNDUP((t), BY2PG)
#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