6f9838a6a5
To avoid a MAXMACH limit of 32 and make txtflush into an array for the bitmap. Provide portable macros for testing and clearing the bits: needtxtflush(), donetxtflush(). On pc/pc64, define inittxtflush()/settxtflush() as no-op macros, avoiding the storage overhead of the txtflush array alltogether.
90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "../port/error.h"
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/*
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* The initcode array contains the binary text of the first
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* user process. Its job is to invoke the exec system call
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* for /boot/boot.
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* Initcode does not link with standard plan9 libc _main()
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* trampoline due to size constrains. Instead it is linked
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* with a small machine specific trampoline init9.s that
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* only sets the base address register and passes arguments
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* to startboot() (see port/initcode.c).
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*/
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#include "initcode.i"
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/*
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* The first process kernel process starts here.
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*/
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static void
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proc0(void*)
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{
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KMap *k;
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Page *p;
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spllo();
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up->pgrp = newpgrp();
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up->egrp = smalloc(sizeof(Egrp));
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up->egrp->ref = 1;
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up->fgrp = dupfgrp(nil);
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up->rgrp = newrgrp();
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/*
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* These are o.k. because rootinit is null.
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* Then early kproc's will have a root and dot.
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*/
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up->slash = namec("#/", Atodir, 0, 0);
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pathclose(up->slash->path);
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up->slash->path = newpath("/");
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up->dot = cclone(up->slash);
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/*
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* Setup Text and Stack segments for initcode.
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*/
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up->seg[SSEG] = newseg(SG_STACK | SG_NOEXEC, USTKTOP-USTKSIZE, USTKSIZE / BY2PG);
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up->seg[TSEG] = newseg(SG_TEXT | SG_RONLY, UTZERO, 1);
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p = newpage(1, 0, UTZERO);
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k = kmap(p);
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memmove((void*)VA(k), initcode, sizeof(initcode));
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kunmap(k);
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settxtflush(p, 1);
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segpage(up->seg[TSEG], p);
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up->seg[TSEG]->flushme = 1;
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/*
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* Become a user process.
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*/
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up->kp = 0;
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up->noswap = 0;
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up->privatemem = 0;
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procpriority(up, PriNormal, 0);
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procsetup(up);
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flushmmu();
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/*
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* init0():
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* call chandevinit()
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* setup environment variables
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* prepare the stack for initcode
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* switch to usermode to run initcode
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*/
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init0();
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/* init0 will never return */
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panic("init0");
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}
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void
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userinit(void)
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{
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up = nil;
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kstrdup(&eve, "");
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kproc("*init*", proc0, nil);
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}
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