clean up stale error checks and panics
delete unused functions a few comments
This commit is contained in:
rtm
parent
b52151e032
commit
2b19190c13
11 changed files with 46 additions and 347 deletions
44
Notes
44
Notes
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@ -95,49 +95,15 @@ inode->count counts in-memory pointers to the struct
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blocks and inodes have ad-hoc sleep-locks
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provide a single mechanism?
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test 14-character file names
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and file arguments longer than 14
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kalloc() can return 0; do callers handle this right?
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OH! recursive interrupts will use up any amount of cpu[].stack!
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underflow and wrecks *previous* cpu's struct
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disk scheduling
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mkdir
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sh arguments
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sh redirection
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indirect blocks
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is there a create/create race for same file name?
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resulting in two entries w/ same name in directory?
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why does shell often ignore first line of input?
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test: one process unlinks a file while another links to it
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test: one process opens a file while another deletes it
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test: mkdir. deadlock d/.. vs ../d, two processes.
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test: deadlock d/.. vs ../d, two processes.
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test: dup() shared fd->off
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test: sbrk
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test: does echo foo > x truncate x?
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make proc[0] runnable
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cpu early tss and gdt
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how do we get cpu0 scheduler() to use mpstack, not proc[0].kstack?
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when iget() first sleeps, where does it longjmp to?
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maybe set up proc[0] to be runnable, with entry proc0main(), then
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have main() call scheduler()?
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perhaps so proc[0] uses right kstack?
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and scheduler() uses mpstack?
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ltr sets the busy bit in the TSS, faults if already set
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so gdt and TSS per cpu?
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we don't want to be using some random process's gdt when it changes it.
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maybe get rid of per-proc gdt and ts
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one per cpu
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refresh it when needed
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setupsegs(proc *)
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why do we get 0 characters from keyboard?
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are the locks in the right place in keyboardintr?
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sh: support pipes? leave it for the class?
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sh: dynamic memory allocation?
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sh: should sh support ; () & --- need malloc
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@ -146,3 +112,11 @@ sh: stop stdin on ctrl-d (for cat > y)
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really should have bdwrite() for file content
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and make some inode updates async
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so soft updates make sense
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disk scheduling
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echo foo > bar should truncate bar
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so O_CREATE should not truncate
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but O_TRUNC should
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make it work on one cpu
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make it work on amsterdam
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@ -9,10 +9,6 @@ struct spinlock console_lock;
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int panicked = 0;
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int use_console_lock = 0;
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// per-cpu copy of output to help panic/lock debugging
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char obuf[NCPU][1024];
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uint obufi[NCPU];
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/*
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* copy console output to parallel port, which you can tell
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* .bochsrc to copy to the stdout:
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@ -37,10 +33,6 @@ cons_putc(int c)
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ushort *crt = (ushort *) 0xB8000; // base of CGA memory
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int ind;
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obuf[rcr4()][obufi[rcr4()]++] = c;
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if(obufi[rcr4()] >= 1024)
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obufi[rcr4()] = 0;
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if(panicked){
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cli();
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for(;;)
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2
defs.h
2
defs.h
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@ -16,7 +16,7 @@ struct jmpbuf;
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void setupsegs(struct proc *);
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struct proc * copyproc(struct proc*);
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struct spinlock;
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char *growproc(int);
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int growproc(int);
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void sleep(void *, struct spinlock *);
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void wakeup(void *);
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void scheduler(void);
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4
main.c
4
main.c
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@ -25,8 +25,6 @@ main0(void)
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int i;
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struct proc *p;
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lcr4(0); // xxx copy of cpu #
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// clear BSS
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memset(edata, 0, end - edata);
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@ -97,8 +95,6 @@ main0(void)
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void
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mpmain(void)
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{
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lcr4(1); // xxx copy of cpu #
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cprintf("cpu%d: starting\n", cpu());
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idtinit(); // CPU's idt
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if(cpu() == 0)
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20
param.h
20
param.h
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@ -1,10 +1,10 @@
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#define NPROC 64
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#define PAGE 4096
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#define KSTACKSIZE PAGE
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#define NCPU 8
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#define NOFILE 16 // file descriptors per process
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#define NFD 100 // file descriptors per system
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#define NREQUEST 100 // outstanding disk requests
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#define NBUF 10
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#define NINODE 100
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#define NDEV 10
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#define NPROC 64 // maximum number of processes
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#define PAGE 4096 // granularity of user-space memory allocation
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#define KSTACKSIZE PAGE // size of per-process kernel stack
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#define NCPU 8 // maximum number of CPUs
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#define NOFILE 16 // file descriptors per process
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#define NFD 100 // file descriptors per system
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#define NREQUEST 100 // outstanding disk requests
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#define NBUF 10 // size of disk block cache
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#define NINODE 100 // maximum number of active i-nodes
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#define NDEV 10 // maximum major device number
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8
proc.c
8
proc.c
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@ -138,22 +138,22 @@ copyproc(struct proc* p)
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return np;
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}
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char *
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int
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growproc(int n)
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{
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struct proc *cp = curproc[cpu()];
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char *newmem, *oldmem;
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newmem = kalloc(cp->sz + n);
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if(newmem == 0) return (char *) -1;
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if(newmem == 0)
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return -1;
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memmove(newmem, cp->mem, cp->sz);
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memset(newmem + cp->sz, 0, n);
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oldmem = cp->mem;
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cp->mem = newmem;
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kfree(oldmem, cp->sz);
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cprintf("growproc: added %d bytes to %d bytes\n", n, cp->sz);
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cp->sz += n;
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return cp->sz - n;
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return 0;
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}
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// Per-CPU process scheduler.
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43
spinlock.c
43
spinlock.c
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@ -6,18 +6,11 @@
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#include "proc.h"
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#include "spinlock.h"
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// Can't call cprintf from inside these routines,
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// because cprintf uses them itself.
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//#define cprintf dont_use_cprintf
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#define LOCKMAGIC 0x6673ffea
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extern int use_console_lock;
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void
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initlock(struct spinlock *lock, char *name)
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{
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lock->magic = LOCKMAGIC;
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lock->name = name;
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lock->locked = 0;
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lock->cpu = 0xffffffff;
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@ -38,8 +31,6 @@ getcallerpcs(void *v, uint pcs[])
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void
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acquire(struct spinlock * lock)
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{
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if(lock->magic != LOCKMAGIC)
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panic("weird lock magic");
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if(holding(lock))
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panic("acquire");
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@ -47,34 +38,32 @@ acquire(struct spinlock * lock)
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cli();
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cpus[cpu()].nlock++;
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while(cmpxchg(0, 1, &lock->locked) == 1)
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;
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cpuid(0, 0, 0, 0, 0); // memory barrier
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getcallerpcs(&lock, lock->pcs);
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lock->cpu = cpu() + 10;
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cpus[cpu()].lastacquire = lock;
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while(cmpxchg(0, 1, &lock->locked) == 1)
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;
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cpuid(0, 0, 0, 0, 0); // memory barrier
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getcallerpcs(&lock, lock->pcs);
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lock->cpu = cpu() + 10;
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cpus[cpu()].lastacquire = lock;
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}
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void
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release(struct spinlock * lock)
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{
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if(lock->magic != LOCKMAGIC)
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panic("weird lock magic");
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if(!holding(lock))
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panic("release");
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if(!holding(lock))
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panic("release");
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cpus[cpu()].lastrelease = lock;
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lock->pcs[0] = 0;
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lock->cpu = 0xffffffff;
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cpuid(0, 0, 0, 0, 0); // memory barrier
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lock->locked = 0;
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if(--cpus[cpu()].nlock == 0)
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sti();
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cpus[cpu()].lastrelease = lock;
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lock->pcs[0] = 0;
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lock->cpu = 0xffffffff;
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cpuid(0, 0, 0, 0, 0); // memory barrier
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lock->locked = 0;
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if(--cpus[cpu()].nlock == 0)
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sti();
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}
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int
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holding(struct spinlock *lock)
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{
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return lock->locked && lock->cpu == cpu() + 10;
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return lock->locked && lock->cpu == cpu() + 10;
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}
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@ -1,5 +1,4 @@
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struct spinlock {
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uint magic;
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char *name;
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uint locked;
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int cpu;
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@ -473,15 +473,15 @@ sys_getpid(void)
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int
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sys_sbrk(void)
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{
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char *r;
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int n;
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struct proc *cp = curproc[cpu()];
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if(fetcharg(0, &n) < 0)
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return -1;
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r = growproc(n);
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if(growproc(n) != 0)
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return -1;
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setupsegs(cp);
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return (int) r;
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return 0;
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}
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int
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45
trap.c
45
trap.c
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@ -34,59 +34,19 @@ void
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trap(struct trapframe *tf)
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{
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int v = tf->trapno;
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if(cpus[cpu()].nlock){
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cprintf("trap v %d eip %x cpu %d nlock %d\n",
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v, tf->eip, cpu(), cpus[cpu()].nlock);
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panic("interrupt while holding a lock");
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}
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if(curproc[cpu()] == 0){
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if(&tf < cpus[cpu()].mpstack || &tf > cpus[cpu()].mpstack + MPSTACK){
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cprintf("&tf %x mpstack %x\n", &tf, cpus[cpu()].mpstack);
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panic("trap cpu stack");
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}
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} else if(curproc[cpu()]){
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if(&tf < curproc[cpu()]->kstack){
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panic("trap kstack");
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}
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}
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if(v == T_SYSCALL){
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struct proc *cp = curproc[cpu()];
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int num = cp->tf->eax;
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if((read_eflags() & FL_IF) == 0)
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panic("syscall but interrupts now disabled");
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if(cp == 0)
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panic("syscall with no proc");
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if(cp->killed)
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proc_exit();
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cp->tf = tf;
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syscall();
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if(cp != curproc[cpu()])
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panic("trap ret wrong curproc");
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if(cp->state != RUNNING)
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panic("trap ret but not RUNNING");
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if(tf != cp->tf)
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panic("trap ret wrong tf");
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if(cpus[cpu()].nlock){
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cprintf("num=%d\n", num);
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panic("syscall returning locks held");
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}
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if((read_eflags() & FL_IF) == 0)
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panic("syscall returning but FL_IF clear");
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if(read_esp() < (uint)cp->kstack ||
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read_esp() >= (uint)cp->kstack + KSTACKSIZE)
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panic("trap ret esp wrong");
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if(cp->killed)
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proc_exit();
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// XXX probably ought to lgdt on trap return
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return;
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}
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//if(read_eflags() & FL_IF)
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//panic("interrupt but interrupts enabled");
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if(v == (IRQ_OFFSET + IRQ_TIMER)){
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struct proc *cp = curproc[cpu()];
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lapic_timerintr();
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@ -108,8 +68,6 @@ trap(struct trapframe *tf)
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if(v == (IRQ_OFFSET + IRQ_IDE)){
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ide_intr();
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if(cpus[cpu()].nlock)
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panic("ide_intr returned while holding a lock");
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cli(); // prevent a waiting interrupt from overflowing stack
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lapic_eoi();
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return;
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@ -117,9 +75,6 @@ trap(struct trapframe *tf)
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if(v == (IRQ_OFFSET + IRQ_KBD)){
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kbd_intr();
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if(cpus[cpu()].nlock){
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panic("kbd_intr returned while holding a lock");
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}
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cli(); // prevent a waiting interrupt from overflowing stack
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lapic_eoi();
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return;
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212
x86.h
212
x86.h
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@ -1,45 +1,3 @@
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static __inline void breakpoint(void) __attribute__((always_inline));
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static __inline uchar inb(int port) __attribute__((always_inline));
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static __inline void insb(int port, void *addr, int cnt) __attribute__((always_inline));
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static __inline ushort inw(int port) __attribute__((always_inline));
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static __inline void insw(int port, void *addr, int cnt) __attribute__((always_inline));
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static __inline uint inl(int port) __attribute__((always_inline));
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static __inline void insl(int port, void *addr, int cnt) __attribute__((always_inline));
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static __inline void outb(int port, uchar data) __attribute__((always_inline));
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static __inline void outsb(int port, const void *addr, int cnt) __attribute__((always_inline));
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static __inline void outw(int port, ushort data) __attribute__((always_inline));
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static __inline void outsw(int port, const void *addr, int cnt) __attribute__((always_inline));
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static __inline void outsl(int port, const void *addr, int cnt) __attribute__((always_inline));
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static __inline void outl(int port, uint data) __attribute__((always_inline));
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static __inline void invlpg(void *addr) __attribute__((always_inline));
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struct segdesc;
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static __inline void lgdt(struct segdesc *p, int) __attribute__((always_inline));
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struct gatedesc;
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static __inline void lidt(struct gatedesc *p, int) __attribute__((always_inline));
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static __inline void lldt(ushort sel) __attribute__((always_inline));
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static __inline void ltr(ushort sel) __attribute__((always_inline));
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static __inline void lcr0(uint val) __attribute__((always_inline));
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static __inline uint rcr0(void) __attribute__((always_inline));
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static __inline uint rcr2(void) __attribute__((always_inline));
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static __inline void lcr3(uint val) __attribute__((always_inline));
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static __inline uint rcr3(void) __attribute__((always_inline));
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static __inline void lcr4(uint val) __attribute__((always_inline));
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static __inline uint rcr4(void) __attribute__((always_inline));
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static __inline void tlbflush(void) __attribute__((always_inline));
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static __inline uint read_eflags(void) __attribute__((always_inline));
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static __inline void write_eflags(uint eflags) __attribute__((always_inline));
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static __inline uint read_ebp(void) __attribute__((always_inline));
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static __inline uint read_esp(void) __attribute__((always_inline));
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static __inline void cpuid(uint info, uint *eaxp, uint *ebxp, uint *ecxp, uint *edxp);
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static __inline void cli(void) __attribute__((always_inline));
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static __inline void sti(void) __attribute__((always_inline));
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static __inline void
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breakpoint(void)
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{
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__asm __volatile("int3");
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}
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static __inline uchar
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inb(int port)
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{
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@ -48,40 +6,6 @@ inb(int port)
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return data;
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}
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static __inline void
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insb(int port, void *addr, int cnt)
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{
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__asm __volatile("cld\n\trepne\n\tinsb" :
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"=D" (addr), "=c" (cnt) :
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"d" (port), "0" (addr), "1" (cnt) :
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"memory", "cc");
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}
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static __inline ushort
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inw(int port)
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{
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ushort data;
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__asm __volatile("inw %w1,%0" : "=a" (data) : "d" (port));
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return data;
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}
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static __inline void
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insw(int port, void *addr, int cnt)
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{
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__asm __volatile("cld\n\trepne\n\tinsw" :
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"=D" (addr), "=c" (cnt) :
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"d" (port), "0" (addr), "1" (cnt) :
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"memory", "cc");
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}
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static __inline uint
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inl(int port)
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{
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uint data;
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__asm __volatile("inl %w1,%0" : "=a" (data) : "d" (port));
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return data;
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}
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static __inline void
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insl(int port, void *addr, int cnt)
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{
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@ -97,30 +21,12 @@ outb(int port, uchar data)
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__asm __volatile("outb %0,%w1" : : "a" (data), "d" (port));
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}
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static __inline void
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outsb(int port, const void *addr, int cnt)
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{
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__asm __volatile("cld\n\trepne\n\toutsb" :
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"=S" (addr), "=c" (cnt) :
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"d" (port), "0" (addr), "1" (cnt) :
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"cc");
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}
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static __inline void
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outw(int port, ushort data)
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{
|
||||
__asm __volatile("outw %0,%w1" : : "a" (data), "d" (port));
|
||||
}
|
||||
|
||||
static __inline void
|
||||
outsw(int port, const void *addr, int cnt)
|
||||
{
|
||||
__asm __volatile("cld\n\trepne\n\toutsw" :
|
||||
"=S" (addr), "=c" (cnt) :
|
||||
"d" (port), "0" (addr), "1" (cnt) :
|
||||
"cc");
|
||||
}
|
||||
|
||||
static __inline void
|
||||
outsl(int port, const void *addr, int cnt)
|
||||
{
|
||||
|
|
@ -130,17 +36,7 @@ outsl(int port, const void *addr, int cnt)
|
|||
"cc");
|
||||
}
|
||||
|
||||
static __inline void
|
||||
outl(int port, uint data)
|
||||
{
|
||||
__asm __volatile("outl %0,%w1" : : "a" (data), "d" (port));
|
||||
}
|
||||
|
||||
static __inline void
|
||||
invlpg(void *addr)
|
||||
{
|
||||
__asm __volatile("invlpg (%0)" : : "r" (addr) : "memory");
|
||||
}
|
||||
struct segdesc;
|
||||
|
||||
static __inline void
|
||||
lgdt(struct segdesc *p, int size)
|
||||
|
|
@ -154,6 +50,8 @@ lgdt(struct segdesc *p, int size)
|
|||
asm volatile("lgdt (%0)" : : "g" (pd));
|
||||
}
|
||||
|
||||
struct gatedesc;
|
||||
|
||||
static __inline void
|
||||
lidt(struct gatedesc *p, int size)
|
||||
{
|
||||
|
|
@ -166,76 +64,12 @@ lidt(struct gatedesc *p, int size)
|
|||
asm volatile("lidt (%0)" : : "g" (pd));
|
||||
}
|
||||
|
||||
static __inline void
|
||||
lldt(ushort sel)
|
||||
{
|
||||
__asm __volatile("lldt %0" : : "r" (sel));
|
||||
}
|
||||
|
||||
static __inline void
|
||||
ltr(ushort sel)
|
||||
{
|
||||
__asm __volatile("ltr %0" : : "r" (sel));
|
||||
}
|
||||
|
||||
static __inline void
|
||||
lcr0(uint val)
|
||||
{
|
||||
__asm __volatile("movl %0,%%cr0" : : "r" (val));
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
rcr0(void)
|
||||
{
|
||||
uint val;
|
||||
__asm __volatile("movl %%cr0,%0" : "=r" (val));
|
||||
return val;
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
rcr2(void)
|
||||
{
|
||||
uint val;
|
||||
__asm __volatile("movl %%cr2,%0" : "=r" (val));
|
||||
return val;
|
||||
}
|
||||
|
||||
static __inline void
|
||||
lcr3(uint val)
|
||||
{
|
||||
__asm __volatile("movl %0,%%cr3" : : "r" (val));
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
rcr3(void)
|
||||
{
|
||||
uint val;
|
||||
__asm __volatile("movl %%cr3,%0" : "=r" (val));
|
||||
return val;
|
||||
}
|
||||
|
||||
static __inline void
|
||||
lcr4(uint val)
|
||||
{
|
||||
__asm __volatile("movl %0,%%cr4" : : "r" (val));
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
rcr4(void)
|
||||
{
|
||||
uint cr4;
|
||||
__asm __volatile("movl %%cr4,%0" : "=r" (cr4));
|
||||
return cr4;
|
||||
}
|
||||
|
||||
static __inline void
|
||||
tlbflush(void)
|
||||
{
|
||||
uint cr3;
|
||||
__asm __volatile("movl %%cr3,%0" : "=r" (cr3));
|
||||
__asm __volatile("movl %0,%%cr3" : : "r" (cr3));
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
read_eflags(void)
|
||||
{
|
||||
|
|
@ -250,46 +84,6 @@ write_eflags(uint eflags)
|
|||
__asm __volatile("pushl %0; popfl" : : "r" (eflags));
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
read_ebp(void)
|
||||
{
|
||||
uint ebp;
|
||||
__asm __volatile("movl %%ebp,%0" : "=r" (ebp));
|
||||
return ebp;
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
read_esp(void)
|
||||
{
|
||||
uint esp;
|
||||
__asm __volatile("movl %%esp,%0" : "=r" (esp));
|
||||
return esp;
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
read_esi(void)
|
||||
{
|
||||
uint esi;
|
||||
__asm __volatile("movl %%esi,%0" : "=r" (esi));
|
||||
return esi;
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
read_edi(void)
|
||||
{
|
||||
uint edi;
|
||||
__asm __volatile("movl %%edi,%0" : "=r" (edi));
|
||||
return edi;
|
||||
}
|
||||
|
||||
static __inline uint
|
||||
read_ebx(void)
|
||||
{
|
||||
uint ebx;
|
||||
__asm __volatile("movl %%ebx,%0" : "=r" (ebx));
|
||||
return ebx;
|
||||
}
|
||||
|
||||
static __inline void
|
||||
cpuid(uint info, uint *eaxp, uint *ebxp, uint *ecxp, uint *edxp)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in a new issue