ref: c5393d612fd2a0e4ff3f9557dcb6adb2ad27391f
dir: /sys/src/9/port/portdat.h/
typedef struct Alarms Alarms;
typedef struct Block Block;
typedef struct Chan Chan;
typedef struct Cmdbuf Cmdbuf;
typedef struct Cmdtab Cmdtab;
typedef struct Confmem Confmem;
typedef struct Dev Dev;
typedef struct Dirtab Dirtab;
typedef struct Edf Edf;
typedef struct Egrp Egrp;
typedef struct Evalue Evalue;
typedef struct Fgrp Fgrp;
typedef struct DevConf DevConf;
typedef struct Image Image;
typedef struct Log Log;
typedef struct Logflag Logflag;
typedef struct Mntcache Mntcache;
typedef struct Mount Mount;
typedef struct Mntrah Mntrah;
typedef struct Mntrpc Mntrpc;
typedef struct Mntproc Mntproc;
typedef struct Mnt Mnt;
typedef struct Mhead Mhead;
typedef struct Note Note;
typedef struct Page Page;
typedef struct Path Path;
typedef struct Palloc Palloc;
typedef struct Pallocmem Pallocmem;
typedef struct Perf Perf;
typedef struct PhysUart PhysUart;
typedef struct Pgrp Pgrp;
typedef struct Physseg Physseg;
typedef struct Proc Proc;
typedef struct Pte Pte;
typedef struct QLock QLock;
typedef struct Queue Queue;
typedef struct Ref Ref;
typedef struct Rendez Rendez;
typedef struct Rendezq Rendezq;
typedef struct Rgrp Rgrp;
typedef struct RWlock RWlock;
typedef struct Sargs Sargs;
typedef struct Schedq Schedq;
typedef struct Segment Segment;
typedef struct Segio Segio;
typedef struct Sema Sema;
typedef struct Timer Timer;
typedef struct Timers Timers;
typedef struct Uart Uart;
typedef struct Waitq Waitq;
typedef struct Walkqid Walkqid;
typedef struct Watchpt Watchpt;
typedef struct Watchdog Watchdog;
typedef int Devgen(Chan*, char*, Dirtab*, int, int, Dir*);
#pragma incomplete DevConf
#pragma incomplete Edf
#pragma incomplete Mntcache
#pragma incomplete Mntrpc
#pragma incomplete Queue
#pragma incomplete Timers
#include <fcall.h>
struct Ref
{
long ref;
};
struct Rendez
{
Lock;
Proc *p;
};
struct QLock
{
Lock use; /* to access Qlock structure */
Proc *head; /* next process waiting for object */
Proc *tail; /* last process waiting for object */
int locked; /* flag */
};
struct Rendezq
{
QLock;
Rendez;
};
struct RWlock
{
Lock use;
Proc *head; /* list of waiting processes */
Proc *tail;
uintptr wpc; /* pc of writer */
Proc *wproc; /* writing proc */
int readers; /* number of readers */
int writer; /* number of writers */
};
struct Alarms
{
QLock;
Proc *head;
};
struct Sargs
{
uchar args[MAXSYSARG*BY2WD];
};
/*
* Access types in namec & channel flags
*/
enum
{
Aaccess, /* as in stat, wstat */
Abind, /* for left-hand-side of bind */
Atodir, /* as in chdir */
Aopen, /* for i/o */
Amount, /* to be mounted or mounted upon */
Acreate, /* is to be created */
Aremove, /* will be removed by caller */
COPEN = 0x0001, /* for i/o */
CMSG = 0x0002, /* the message channel for a mount */
/*rsc CCREATE = 0x0004, /* permits creation if c->mnt */
CCEXEC = 0x0008, /* close on exec */
CFREE = 0x0010, /* not in use */
CRCLOSE = 0x0020, /* remove on close */
CCACHE = 0x0080, /* client cache */
};
/* flag values */
enum
{
BINTR = (1<<0),
BFREE = (1<<1),
Bipck = (1<<2), /* ip checksum */
Budpck = (1<<3), /* udp checksum */
Btcpck = (1<<4), /* tcp checksum */
Bpktck = (1<<5), /* packet checksum */
};
struct Block
{
Block* next;
Block* list;
uchar* rp; /* first unconsumed byte */
uchar* wp; /* first empty byte */
uchar* lim; /* 1 past the end of the buffer */
uchar* base; /* start of the buffer */
void (*free)(Block*);
ushort flag;
ushort checksum; /* IP checksum of complete packet (minus media header) */
};
#define BLEN(s) ((s)->wp - (s)->rp)
#define BALLOC(s) ((s)->lim - (s)->base)
struct Chan
{
Ref;
Lock;
Chan* next; /* allocation */
Chan* link;
vlong offset; /* in fd */
vlong devoffset; /* in underlying device; see read */
ushort type;
ulong dev;
ushort mode; /* read/write */
ushort flag;
Qid qid;
int fid; /* for devmnt */
ulong iounit; /* chunk size for i/o; 0==default */
Mhead* umh; /* mount point that derived Chan; used in unionread */
Chan* umc; /* channel in union; held for union read */
QLock umqlock; /* serialize unionreads */
int uri; /* union read index */
int dri; /* devdirread index */
uchar* dirrock; /* directory entry rock for translations */
int nrock;
int mrock;
QLock rockqlock;
int ismtpt;
Mntcache*mcp; /* Mount cache pointer */
Mnt* mux; /* Mnt for clients using me for messages */
union {
void* aux;
Qid pgrpid; /* for #p/notepg */
ulong mid; /* for ns in devproc */
};
Chan* mchan; /* channel to mounted server */
Qid mqid; /* qid of root of mount point */
Path* path;
};
struct Path
{
Ref;
char *s;
Chan **mtpt; /* mtpt history */
int len; /* strlen(s) */
int alen; /* allocated length of s */
int mlen; /* number of path elements */
int malen; /* allocated length of mtpt */
};
struct Dev
{
int dc;
char* name;
void (*reset)(void);
void (*init)(void);
void (*shutdown)(void);
Chan* (*attach)(char*);
Walkqid*(*walk)(Chan*, Chan*, char**, int);
int (*stat)(Chan*, uchar*, int);
Chan* (*open)(Chan*, int);
Chan* (*create)(Chan*, char*, int, ulong);
void (*close)(Chan*);
long (*read)(Chan*, void*, long, vlong);
Block* (*bread)(Chan*, long, ulong);
long (*write)(Chan*, void*, long, vlong);
long (*bwrite)(Chan*, Block*, ulong);
void (*remove)(Chan*);
int (*wstat)(Chan*, uchar*, int);
void (*power)(int); /* power mgt: power(1) => on, power (0) => off */
int (*config)(int, char*, DevConf*); /* returns nil on error */
};
struct Dirtab
{
char name[KNAMELEN];
Qid qid;
vlong length;
long perm;
};
struct Walkqid
{
Chan *clone;
int nqid;
Qid qid[1];
};
struct Mount
{
ulong mountid;
int mflag;
Mount* next;
Mount* order;
Chan* to; /* channel replacing channel */
char* spec;
};
struct Mhead
{
Ref;
RWlock lock;
Chan* from; /* channel mounted upon */
Mount* mount; /* what's mounted upon it */
Mhead* hash; /* Hash chain */
};
struct Mntrah
{
Rendez;
ulong vers;
vlong off;
vlong seq;
uint i;
Mntrpc *r[8];
};
struct Mntproc
{
Rendez;
Mnt *m;
Mntrpc *r;
void *a;
void (*f)(Mntrpc*, void*);
};
struct Mnt
{
Lock;
/* references are counted using c->ref; channels on this mount point incref(c->mchan) == Mnt.c */
Chan *c; /* Channel to file service */
Proc *rip; /* Reader in progress */
Mntrpc *queue; /* Queue of pending requests on this channel */
Mntproc defered[8]; /* Worker processes for defered RPCs (read ahead) */
ulong id; /* Multiplexer id for channel check */
Mnt *list; /* Free list */
int flags; /* cache */
int msize; /* data + IOHDRSZ */
char *version; /* 9P version */
Queue *q; /* input queue */
};
enum
{
NUser, /* note provided externally */
NExit, /* deliver note quietly */
NDebug, /* print debug message */
};
struct Note
{
char msg[ERRMAX];
int flag; /* whether system posted it */
};
enum
{
PG_MOD = 0x01, /* software modified bit */
PG_REF = 0x02, /* software referenced bit */
};
struct Page
{
Ref;
Page *next; /* Free list or Hash chains */
uintptr pa; /* Physical address in memory */
uintptr va; /* Virtual address for user */
uintptr daddr; /* Disc address on swap */
Image *image; /* Associated text or swap image */
ulong txtflush; /* Flush icache for putmmu */
ushort refage; /* Swap reference age */
char modref; /* Simulated modify/reference bits */
char color; /* Cache coloring */
};
struct Swapalloc
{
Lock; /* Free map lock */
int free; /* currently free swap pages */
uchar* swmap; /* Base of swap map in memory */
uchar* alloc; /* Round robin allocator */
uchar* last; /* Speed swap allocation */
uchar* top; /* Top of swap map */
Rendez r; /* Pager kproc idle sleep */
ulong highwater; /* Pager start threshold */
ulong headroom; /* Space pager frees under highwater */
ulong xref; /* Ref count for all map refs >= 255 */
}swapalloc;
struct Pte
{
Page *pages[PTEPERTAB]; /* Page map for this chunk of pte */
Page **first; /* First used entry */
Page **last; /* Last used entry */
};
/* Segment types */
enum
{
SG_TYPE = 07, /* Mask type of segment */
SG_TEXT = 00,
SG_DATA = 01,
SG_BSS = 02,
SG_STACK = 03,
SG_SHARED = 04,
SG_PHYSICAL = 05,
SG_FIXED = 06,
SG_STICKY = 07,
SG_RONLY = 0040, /* Segment is read only */
SG_CEXEC = 0100, /* Detach at exec */
SG_FAULT = 0200, /* Fault on access */
SG_CACHED = 0400,
};
#define PG_ONSWAP 1
#define onswap(s) (((uintptr)s)&PG_ONSWAP)
#define pagedout(s) (((uintptr)s)==0 || onswap(s))
#define swapaddr(s) (((uintptr)s)&~PG_ONSWAP)
#define SEGMAXSIZE (SEGMAPSIZE*PTEMAPMEM)
struct Physseg
{
int attr; /* Segment attributes */
char *name; /* Attach name */
uintptr pa; /* Physical address */
uintptr size; /* Maximum segment size in bytes */
};
struct Sema
{
Rendez;
long *addr;
int waiting;
Sema *next;
Sema *prev;
};
struct Segment
{
Ref;
QLock;
int type; /* segment type */
uintptr base; /* virtual base */
uintptr top; /* virtual top */
ulong size; /* size in pages */
uintptr fstart; /* start address in file for demand load */
uintptr flen; /* length of segment in file */
int flushme; /* maintain icache for this segment */
Image *image; /* text in file attached to this segment */
Physseg *pseg;
ulong* profile; /* Tick profile area */
Pte **map;
int mapsize;
Pte *ssegmap[SSEGMAPSIZE];
Sema sema;
ulong mark; /* portcountrefs */
};
struct Segio
{
QLock;
Rendez cmdwait;
Rendez replywait;
Proc *p; /* segmentio kproc */
Segment *s;
char *data;
char *addr;
int dlen;
int cmd;
char *err;
};
enum
{
RENDLOG = 5,
RENDHASH = 1<<RENDLOG, /* Hash to lookup rendezvous tags */
MNTLOG = 5,
MNTHASH = 1<<MNTLOG, /* Hash to walk mount table */
NFD = 100, /* per process file descriptors */
PGHLOG = 9,
PGHSIZE = 1<<PGHLOG, /* Page hash for image lookup */
};
#define REND(p,s) ((p)->rendhash[(s)&((1<<RENDLOG)-1)])
#define MOUNTH(p,qid) ((p)->mnthash[(qid).path&((1<<MNTLOG)-1)])
#define PGHASH(i,daddr) ((i)->pghash[((daddr)>>PGSHIFT)&(PGHSIZE-1)])
struct Image
{
Ref;
Lock;
Chan *c; /* channel to text file, nil when not used */
Qid qid; /* Qid for page cache coherence */
ulong dev; /* Device id of owning channel */
ushort type; /* Device type of owning channel */
char notext; /* no file associated */
Segment *s; /* TEXT segment for image if running */
Image *hash; /* Qid hash chains */
Image *next; /* Free list */
long pgref; /* number of cached pages (pgref <= ref) */
Page *pghash[PGHSIZE]; /* page cache */
};
struct Pgrp
{
Ref;
RWlock ns; /* Namespace n read/one write lock */
int noattach;
ulong pgrpid;
Mhead *mnthash[MNTHASH];
};
struct Rgrp
{
Ref;
Lock;
Proc *rendhash[RENDHASH]; /* Rendezvous tag hash */
};
struct Egrp
{
Ref;
RWlock;
Evalue *ent;
int nent;
int ment;
ulong path; /* qid.path of next Evalue to be allocated */
ulong vers; /* of Egrp */
};
struct Evalue
{
char *name;
char *value;
int len;
Qid qid;
};
struct Fgrp
{
Ref;
Lock;
Chan **fd;
int nfd; /* number allocated */
int maxfd; /* highest fd in use */
int exceed; /* debugging */
};
enum
{
DELTAFD = 20 /* incremental increase in Fgrp.fd's */
};
struct Pallocmem
{
uintptr base;
ulong npage;
};
struct Palloc
{
Lock;
Page *head; /* freelist head */
ulong freecount; /* how many pages on free list now */
Page *pages; /* array of all pages */
ulong user; /* how many user pages */
Rendezq pwait[2]; /* Queues of procs waiting for memory */
Pallocmem mem[16]; /* physical user page banks */
};
struct Waitq
{
Waitmsg w;
Waitq *next;
};
/*
* fasttick timer interrupts
*/
enum {
/* Mode */
Trelative, /* timer programmed in ns from now */
Tperiodic, /* periodic timer, period in ns */
};
struct Timer
{
/* Public interface */
int tmode; /* See above */
vlong tns; /* meaning defined by mode */
void (*tf)(Ureg*, Timer*);
void *ta;
/* Internal */
Lock;
Mach *tactive; /* The cpu that tf is active on */
Timers *tt; /* Timers queue this timer runs on */
Tval tticks; /* tns converted to ticks */
Tval twhen; /* ns represented in fastticks */
Timer *tnext;
};
enum
{
RFNAMEG = (1<<0),
RFENVG = (1<<1),
RFFDG = (1<<2),
RFNOTEG = (1<<3),
RFPROC = (1<<4),
RFMEM = (1<<5),
RFNOWAIT = (1<<6),
RFCNAMEG = (1<<10),
RFCENVG = (1<<11),
RFCFDG = (1<<12),
RFREND = (1<<13),
RFNOMNT = (1<<14),
};
/*
* process memory segments - NSEG always last !
*/
enum
{
SSEG, TSEG, DSEG, BSEG, ESEG, LSEG, SEG1, SEG2, SEG3, SEG4, NSEG
};
enum
{
Dead = 0, /* Process states */
Moribund,
Ready,
Scheding,
Running,
Queueing,
QueueingR,
QueueingW,
Wakeme,
Broken,
Stopped,
Rendezvous,
Waitrelease,
Proc_stopme = 1, /* devproc requests */
Proc_exitme,
Proc_traceme,
Proc_exitbig,
Proc_tracesyscall,
TUser = 0, /* Proc.time */
TSys,
TReal,
TCUser,
TCSys,
TCReal,
NERR = 64,
NNOTE = 5,
Npriq = 20, /* number of scheduler priority levels */
Nrq = Npriq+2, /* number of priority levels including real time */
PriRelease = Npriq, /* released edf processes */
PriEdf = Npriq+1, /* active edf processes */
PriNormal = 10, /* base priority for normal processes */
PriExtra = Npriq-1, /* edf processes at high best-effort pri */
PriKproc = 13, /* base priority for kernel processes */
PriRoot = 13, /* base priority for root processes */
};
struct Schedq
{
Lock;
Proc* head;
Proc* tail;
int n;
};
struct Proc
{
Label sched; /* known to l.s */
char *kstack; /* known to l.s */
Mach *mach; /* machine running this proc */
char *text;
char *user;
char *args;
int nargs; /* number of bytes of args */
int setargs; /* process changed its args */
Proc *rnext; /* next process in run queue */
Proc *qnext; /* next process on queue for a QLock */
QLock *qlock; /* addr of qlock being queued for DEBUG */
int state;
char *psstate; /* What /proc/#/status reports */
Segment *seg[NSEG];
QLock seglock; /* locked whenever seg[] changes */
ulong pid;
ulong noteid; /* Equivalent of note group */
Proc *pidhash; /* next proc in pid hash */
Lock exl; /* Lock count and waitq */
Waitq *waitq; /* Exited processes wait children */
int nchild; /* Number of living children */
int nwait; /* Number of uncollected wait records */
QLock qwaitr;
Rendez waitr; /* Place to hang out in wait */
Proc *parent;
Pgrp *pgrp; /* Process group for namespace */
Egrp *egrp; /* Environment group */
Fgrp *fgrp; /* File descriptor group */
Rgrp *rgrp; /* Rendez group */
Fgrp *closingfgrp; /* used during teardown */
ulong parentpid;
int insyscall;
ulong time[6]; /* User, Sys, Real; child U, S, R */
uvlong kentry; /* Kernel entry time stamp (for profiling) */
/*
* pcycles: cycles spent in this process (updated on procsave/restore)
* when this is the current proc and we're in the kernel
* (procrestores outnumber procsaves by one)
* the number of cycles spent in the proc is pcycles + cycles()
* when this is not the current process or we're in user mode
* (procrestores and procsaves balance), it is pcycles.
*/
vlong pcycles;
QLock debug; /* to access debugging elements of User */
Proc *pdbg; /* the debugging process */
ulong procmode; /* proc device default file mode */
int privatemem; /* proc does not let anyone read mem */
int hang; /* hang at next exec for debug */
int procctl; /* Control for /proc debugging */
uintptr pc; /* DEBUG only */
Lock rlock; /* sync sleep/wakeup with postnote */
Rendez *r; /* rendezvous point slept on */
Rendez sleep; /* place for syssleep/debug */
int notepending; /* note issued but not acted on */
int kp; /* true if a kernel process */
Proc *palarm; /* Next alarm time */
ulong alarm; /* Time of call */
int newtlb; /* Pager has changed my pte's, I must flush */
int noswap; /* process is not swappable */
uintptr rendtag; /* Tag for rendezvous */
uintptr rendval; /* Value for rendezvous */
Proc *rendhash; /* Hash list for tag values */
Timer; /* For tsleep and real-time */
Rendez *trend;
int (*tfn)(void*);
void (*kpfun)(void*);
void *kparg;
int scallnr; /* sys call number */
Sargs s; /* syscall arguments */
int nerrlab;
Label errlab[NERR];
char *syserrstr; /* last error from a system call, errbuf0 or 1 */
char *errstr; /* reason we're unwinding the error stack, errbuf1 or 0 */
char errbuf0[ERRMAX];
char errbuf1[ERRMAX];
char genbuf[128]; /* buffer used e.g. for last name element from namec */
Chan *slash;
Chan *dot;
Note note[NNOTE];
short nnote;
short notified; /* sysnoted is due */
Note lastnote;
int (*notify)(void*, char*);
Lock *lockwait;
Lock *lastlock; /* debugging */
Lock *lastilock; /* debugging */
Mach *wired;
Mach *mp; /* machine this process last ran on */
int nlocks; /* number of locks held by proc */
ulong delaysched;
ulong priority; /* priority level */
ulong basepri; /* base priority level */
uchar fixedpri; /* priority level deson't change */
ulong cpu; /* cpu average */
ulong lastupdate;
uchar yield; /* non-zero if the process just did a sleep(0) */
ulong readytime; /* time process came ready */
ulong movetime; /* last time process switched processors */
int preempted; /* true if this process hasn't finished the interrupt
* that last preempted it
*/
Edf *edf; /* if non-null, real-time proc, edf contains scheduling params */
int trace; /* process being traced? */
uintptr qpc; /* pc calling last blocking qlock */
QLock *eql; /* interruptable eqlock */
void *ureg; /* User registers for notes */
void *dbgreg; /* User registers for devproc */
PFPU; /* machine specific fpu state */
PMMU; /* machine specific mmu state */
char *syscalltrace; /* syscall trace */
Watchpt *watchpt; /* watchpoints */
int nwatchpt;
};
enum
{
PRINTSIZE = 256,
NUMSIZE = 12, /* size of formatted number */
MB = (1024*1024),
/* READSTR was 1000, which is way too small for usb's ctl file */
READSTR = 8000, /* temporary buffer size for device reads */
};
extern Conf conf;
extern char* conffile;
extern int cpuserver;
extern Dev* devtab[];
extern char* eve;
extern char hostdomain[];
extern uchar initcode[];
extern Queue* kprintoq;
extern int nsyscall;
extern Palloc palloc;
extern Queue* serialoq;
extern char* statename[];
extern Image swapimage;
extern Image fscache;
extern char* sysname;
extern uint qiomaxatomic;
extern char* sysctab[];
enum
{
LRESPROF = 3,
};
/*
* action log
*/
struct Log {
Lock;
int opens;
char* buf;
char *end;
char *rptr;
int len;
int nlog;
int minread;
int logmask; /* mask of things to debug */
QLock readq;
Rendez readr;
};
struct Logflag {
char* name;
int mask;
};
enum
{
NCMDFIELD = 128
};
struct Cmdbuf
{
char *buf;
char **f;
int nf;
};
struct Cmdtab
{
int index; /* used by client to switch on result */
char *cmd; /* command name */
int narg; /* expected #args; 0 ==> variadic */
};
/*
* routines to access UART hardware
*/
struct PhysUart
{
char* name;
Uart* (*pnp)(void);
void (*enable)(Uart*, int);
void (*disable)(Uart*);
void (*kick)(Uart*);
void (*dobreak)(Uart*, int);
int (*baud)(Uart*, int);
int (*bits)(Uart*, int);
int (*stop)(Uart*, int);
int (*parity)(Uart*, int);
void (*modemctl)(Uart*, int);
void (*rts)(Uart*, int);
void (*dtr)(Uart*, int);
long (*status)(Uart*, void*, long, long);
void (*fifo)(Uart*, int);
void (*power)(Uart*, int);
int (*getc)(Uart*); /* polling versions, for iprint, rdb */
void (*putc)(Uart*, int);
};
enum {
Stagesize= 2048
};
/*
* software UART
*/
struct Uart
{
void* regs; /* hardware stuff */
void* saveregs; /* place to put registers on power down */
char* name; /* internal name */
ulong freq; /* clock frequency */
int bits; /* bits per character */
int stop; /* stop bits */
int parity; /* even, odd or no parity */
int baud; /* baud rate */
PhysUart*phys;
int console; /* used as a serial console */
int special; /* internal kernel device */
Uart* next; /* list of allocated uarts */
QLock;
int type; /* ?? */
int dev;
int opens;
int enabled;
Uart *elist; /* next enabled interface */
int perr; /* parity errors */
int ferr; /* framing errors */
int oerr; /* rcvr overruns */
int berr; /* no input buffers */
int serr; /* input queue overflow */
/* buffers */
int (*putc)(Queue*, int);
Queue *iq;
Queue *oq;
Lock rlock;
uchar istage[Stagesize];
uchar *iw;
uchar *ir;
uchar *ie;
Lock tlock; /* transmit */
uchar ostage[Stagesize];
uchar *op;
uchar *oe;
int drain;
int modem; /* hardware flow control on */
int xonoff; /* software flow control on */
int blocked;
int cts, dsr, dcd; /* keep track of modem status */
int ctsbackoff;
int hup_dsr, hup_dcd; /* send hangup upstream? */
int dohup;
Rendez r;
};
extern Uart* consuart;
/*
* performance timers, all units in perfticks
*/
struct Perf
{
ulong intrts; /* time of last interrupt */
ulong inintr; /* time since last clock tick in interrupt handlers */
ulong avg_inintr; /* avg time per clock tick in interrupt handlers */
ulong inidle; /* time since last clock tick in idle loop */
ulong avg_inidle; /* avg time per clock tick in idle loop */
ulong last; /* value of perfticks() at last clock tick */
ulong period; /* perfticks() per clock tick */
};
struct Watchdog
{
void (*enable)(void); /* watchdog enable */
void (*disable)(void); /* watchdog disable */
void (*restart)(void); /* watchdog restart */
void (*stat)(char*, char*); /* watchdog statistics */
};
struct Watchpt
{
enum {
WATCHRD = 1,
WATCHWR = 2,
WATCHEX = 4,
} type;
uintptr addr, len;
};
/* queue state bits, Qmsg, Qcoalesce, and Qkick can be set in qopen */
enum
{
/* Queue.state */
Qstarve = (1<<0), /* consumer starved */
Qmsg = (1<<1), /* message stream */
Qclosed = (1<<2), /* queue has been closed/hungup */
Qflow = (1<<3), /* producer flow controlled */
Qcoalesce = (1<<4), /* coallesce packets on read */
Qkick = (1<<5), /* always call the kick routine after qwrite */
};
#define DEVDOTDOT -1
#pragma varargck type "I" uchar*
#pragma varargck type "V" uchar*
#pragma varargck type "E" uchar*
#pragma varargck type "M" uchar*
/*
* Log console output so it can be retrieved via /dev/kmesg.
* This is good for catching boot-time messages after the fact.
*/
struct {
Lock lk;
uint n;
char buf[16384];
} kmesg;