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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 vlong */
#define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1))
#define PGROUND(s) ROUND(s, BY2PG)
#define MAXBY2PG (16*1024) /* rounding for UTZERO in executables; see mkfile */
#define UTROUND(t) ROUNDUP((t), MAXBY2PG)
#ifndef BIGPAGES
#define BY2PG 4096 /* bytes per page */
#define PGSHIFT 12 /* log2(BY2PG) */
#define PGSZ PGSZ4K
#else
/* 16K pages work very poorly */
#define BY2PG (16*1024) /* bytes per page */
#define PGSHIFT 14 /* log2(BY2PG) */
#define PGSZ PGSZ16K
#endif
#define KSTACK (8*1024) /* Size of kernel stack */
#define MACHSIZE (BY2PG+KSTACK)
#define WD2PG (BY2PG/BY2WD) /* words per page */
#define MAXMACH 1 /* max # cpus system can run; see active.machs */
#define STACKALIGN(sp) ((sp) & ~7) /* bug: assure with alloc */
#define BLOCKALIGN 16
#define CACHELINESZ 32 /* mips24k */
#define ICACHESIZE (64*1024) /* rb450g */
#define DCACHESIZE (32*1024) /* rb450g */
#define MASK(w) FMASK(0, w)
/*
* Time
*/
#define HZ 100 /* clock frequency */
#define MS2HZ (1000/HZ) /* millisec per clock tick */
#define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
/*
* CP0 registers
*/
#define INDEX 0
#define RANDOM 1
#define TLBPHYS0 2 /* aka ENTRYLO0 */
#define TLBPHYS1 3 /* aka ENTRYLO1 */
#define CONTEXT 4
#define PAGEMASK 5
#define WIRED 6
#define BADVADDR 8
#define COUNT 9
#define TLBVIRT 10 /* aka ENTRYHI */
#define COMPARE 11
#define STATUS 12
#define CAUSE 13
#define EPC 14
#define PRID 15
#define CONFIG 16
#define LLADDR 17
#define WATCHLO 18
#define WATCHHI 19
#define DEBUGREG 23
#define DEPC 24
#define PERFCOUNT 25
#define CACHEECC 26
#define CACHEERR 27
#define TAGLO 28
#define TAGHI 29
#define ERROREPC 30
#define DESAVE 31
/*
* M(STATUS) bits
*/
#define KMODEMASK 0x0000001f
#define IE 0x00000001 /* master interrupt enable */
#define EXL 0x00000002 /* exception level */
#define ERL 0x00000004 /* error level */
#define KSUPER 0x00000008
#define KUSER 0x00000010
#define KSU 0x00000018
#define UX 0x00000020
#define SX 0x00000040
#define KX 0x00000080
#define INTMASK 0x0000ff00
#define SW0 0x00000100
#define SW1 0x00000200
#define INTR0 0x00000100 /* interrupt enable bits */
#define INTR1 0x00000200
#define INTR2 0x00000400
#define INTR3 0x00000800
#define INTR4 0x00001000
#define INTR5 0x00002000
#define INTR6 0x00004000
#define INTR7 0x00008000
#define DE 0x00010000
#define TS 0x00200000 /* tlb shutdown; on 24k at least */
#define BEV 0x00400000 /* bootstrap exception vectors */
#define RE 0x02000000 /* reverse-endian in user mode */
#define FR 0x04000000 /* enable 32 FP regs */
#define CU0 0x10000000
#define CU1 0x20000000 /* FPU enable */
/*
* M(CONFIG) bits
*/
#define CFG_K0 7 /* kseg0 cachability */
#define CFG_MM (1<<18) /* write-through merging enabled */
/*
* M(CAUSE) bits
*/
#define BD (1<<31) /* last excep'n occurred in branch delay slot */
/*
* Exception codes
*/
#define EXCMASK 0x1f /* mask of all causes */
#define CINT 0 /* external interrupt */
#define CTLBM 1 /* TLB modification: store to unwritable page */
#define CTLBL 2 /* TLB miss (load or fetch) */
#define CTLBS 3 /* TLB miss (store) */
#define CADREL 4 /* address error (load or fetch) */
#define CADRES 5 /* address error (store) */
#define CBUSI 6 /* bus error (fetch) */
#define CBUSD 7 /* bus error (data load or store) */
#define CSYS 8 /* system call */
#define CBRK 9 /* breakpoint */
#define CRES 10 /* reserved instruction */
#define CCPU 11 /* coprocessor unusable */
#define COVF 12 /* arithmetic overflow */
#define CTRAP 13 /* trap */
#define CVCEI 14 /* virtual coherence exception (instruction) */
#define CFPE 15 /* floating point exception */
#define CTLBRI 19 /* tlb read-inhibit */
#define CTLBXI 20 /* tlb execute-inhibit */
#define CWATCH 23 /* watch exception */
#define CMCHK 24 /* machine checkcore */
#define CCACHERR 30 /* cache error */
#define CVCED 31 /* virtual coherence exception (data) */
/*
* M(CACHEECC) a.k.a. ErrCtl bits
*/
#define PE (1<<31)
#define LBE (1<<25)
#define WABE (1<<24)
/*
* Trap vectors
*/
#define UTLBMISS (KSEG0+0x000)
#define XEXCEPTION (KSEG0+0x080)
#define CACHETRAP (KSEG0+0x100)
#define EXCEPTION (KSEG0+0x180)
/*
* Magic registers
*/
#define USER 24 /* R24 is up-> */
#define MACH 25 /* R25 is m-> */
#define UREGSIZE 0xA0 /* sizeof(Ureg)+8 */
/*
* MMU
*/
#define PGSZ4K (0x00<<13)
#define PGSZ16K (0x03<<13) /* on 24k */
#define PGSZ64K (0x0F<<13)
#define PGSZ256K (0x3F<<13)
#define PGSZ1M (0xFF<<13)
#define PGSZ4M (0x3FF<<13)
#define PGSZ8M (0x7FF<<13) /* not on 24k */
#define PGSZ16M (0xFFF<<13)
#define PGSZ64M (0x3FFF<<13) /* on 24k */
#define PGSZ256M (0xFFFF<<13) /* on 24k */
/* mips address spaces, tlb-mapped unless marked otherwise */
#define KUSEG 0x00000000 /* user process */
#define KSEG0 0x80000000 /* kernel (direct mapped, cached) */
#define KSEG1 0xA0000000 /* kernel (direct mapped, uncached: i/o) */
#define KSEG2 0xC0000000 /* kernel, used for TSTKTOP */
#define KSEG3 0xE0000000 /* kernel, used by kmap */
#define KSEGM 0xE0000000 /* mask to check which seg */
/*
* Fundamental addresses
*/
#define REBOOTADDR KADDR(0x1000) /* just above vectors */
#define MACHADDR 0x88014000 /* Mach structures */
#define MACHP(n) ((Mach *)(MACHADDR+(n)*MACHSIZE))
#define KMAPADDR 0xE0000000 /* kmap'd addresses */
#define SPBADDR 0x80001000
#define PIDXSHFT 12
#ifndef BIGPAGES
#define NCOLOR 8
#define PIDX ((NCOLOR-1)<<PIDXSHFT)
#define getpgcolor(a) (((ulong)(a)>>PIDXSHFT) % NCOLOR)
#else
/* no cache aliases are possible with pages of 16K or larger */
#define NCOLOR 1
#define PIDX 0
#define getpgcolor(a) 0
#endif
#define KMAPSHIFT 15
#define PTEGLOBL (1<<0)
#define PTEVALID (1<<1)
#define PTEWRITE (1<<2)
#define PTERONLY 0
#define PTEALGMASK (7<<3)
#define PTENONCOHERWT (0<<3) /* cached, write-through (slower) */
#define PTEUNCACHED (2<<3)
#define PTENONCOHERWB (3<<3) /* cached, write-back */
#define PTEUNCACHEDACC (7<<3)
/* rest are reserved on 24k */
#define PTECOHERXCL (4<<3)
#define PTECOHERXCLW (5<<3)
#define PTECOHERUPDW (6<<3)
/* how much faster is it? mflops goes from about .206 (WT) to .37 (WB) */
// #define PTECACHABILITY PTENONCOHERWT /* 24k erratum 48 disallows WB */
#define PTECACHABILITY PTENONCOHERWB
#define PTEPID(n) (n)
#define PTEMAPMEM (1024*1024)
#define PTEPERTAB (PTEMAPMEM/BY2PG)
#define SEGMAPSIZE 512
#define SSEGMAPSIZE 16
#define STLBLOG 15
#define STLBSIZE (1<<STLBLOG) /* entries in the soft TLB */
/* page # bits that don't fit in STLBLOG bits */
#define HIPFNBITS (BI2WD - (PGSHIFT+1) - STLBLOG)
#define KPTELOG 8
#define KPTESIZE (1<<KPTELOG) /* entries in the kfault soft TLB */
#define TLBPID(n) ((n)&0xFF)
#define NTLBPID 256 /* # of pids (affects size of Mach) */
#define NTLB 48 /* # of entries (r4k) */
#define TLBOFF 1 /* first tlb entry (0 used within mmuswitch) */
#define NKTLB 2 /* # of initial kfault tlb entries */
#define TLBROFF (TLBOFF+NKTLB) /* first large IO window tlb entry */
/*
* Address spaces
*/
#define UZERO KUSEG /* base of user address space */
#define UTZERO (UZERO+MAXBY2PG) /* 1st user text address; see mkfile */
#define USTKTOP (KZERO-BY2PG) /* byte just beyond user stack */
#define USTKSIZE (8*1024*1024) /* size of user stack */
#define TSTKTOP (KSEG2+USTKSIZE-BY2PG) /* top of temporary stack */
#define TSTKSIZ (1024*1024/BY2PG) /* can be at most UTSKSIZE/BY2PG */
#define KZERO KSEG0 /* base of kernel address space */
#define KTZERO (KZERO+0x08020000) /* first address in kernel text */
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