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Fixed a race in the task-switching code

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svn path=/trunk/; revision=132
This commit is contained in:
David Welch 1998-12-22 19:11:47 +00:00
parent b161ff0650
commit 1628f7a89e
1 changed files with 30 additions and 36 deletions
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66
reactos/ntoskrnl/hal/x86/thread.c
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@ -24,6 +24,9 @@
/* GLOBALS ***************************************************************/
VOID PsBeginThread(PKSTART_ROUTINE StartRoutine, PVOID StartContext);
VOID PsBeginThreadWithContextInternal(VOID);
#define FIRST_TSS_SELECTOR (KERNEL_DS + 0x8)
#define FIRST_TSS_OFFSET (FIRST_TSS_SELECTOR / 8)
@ -69,6 +72,10 @@ void HalTaskSwitch(PKTHREAD thread)
DPRINT("trap %x iomap_base %x nr %x io_bitmap[0] %x\n",
thread->Context.trap,thread->Context.iomap_base,
thread->Context.nr,thread->Context.io_bitmap[0]);
DPRINT("&gdt[nr/8].a %.8x gdt[nr/8].a %.8x gdt[nr/8].b %.8x\n",
&(gdt[thread->Context.nr/8].a),
gdt[thread->Context.nr/8].a,
gdt[thread->Context.nr/8].b);
__asm__("pushfl\n\t"
"cli\n\t"
"ljmp %0\n\t"
@ -97,23 +104,6 @@ static unsigned int allocate_tss_descriptor(void)
return(0);
}
static void begin_thread(PKSTART_ROUTINE fn, PVOID start_context)
/*
* FUNCTION: This function is the start point for all new threads
* ARGUMENTS:
* fn = Actual start point of the thread
* start_context = Parameter to pass to the start routine
* RETURNS: Can't
*/
{
NTSTATUS ret;
// DPRINT("begin_thread %x %x\n",fn,start_context);
KeLowerIrql(PASSIVE_LEVEL);
ret = fn(start_context);
PsTerminateSystemThread(ret);
for(;;);
}
#define FLAG_NT (1<<14)
#define FLAG_VM (1<<17)
#define FLAG_IF (1<<9)
@ -177,8 +167,9 @@ NTSTATUS HalInitTaskWithContext(PETHREAD Thread, PCONTEXT Context)
unsigned int desc;
unsigned int length;
unsigned int base;
unsigned int* kernel_stack;
PVOID kernel_stack;
NTSTATUS Status;
PVOID stack_start;
DPRINT("HalInitTaskWithContext(Thread %x, Context %x)\n",
Thread,Context);
@ -202,33 +193,29 @@ NTSTATUS HalInitTaskWithContext(PETHREAD Thread, PCONTEXT Context)
gdt[desc].b = ((base & 0xff0000)>>16) | 0x8900 | (length & 0xf0000)
| (base & 0xff000000);
stack_start = kernel_stack + 4096 - sizeof(CONTEXT);
memcpy(stack_start, Context, sizeof(CONTEXT));
/*
* Initialize the thread context
*/
memset(&Thread->Tcb.Context,0,sizeof(hal_thread_state));
Thread->Tcb.Context.ldt = null_ldt_sel;
Thread->Tcb.Context.eflags = Context->EFlags;
Thread->Tcb.Context.eflags = (1<<1) + (1<<9);
Thread->Tcb.Context.iomap_base = FIELD_OFFSET(hal_thread_state,io_bitmap);
Thread->Tcb.Context.esp0 = (ULONG)&kernel_stack[1021];
Thread->Tcb.Context.esp0 = stack_start;
Thread->Tcb.Context.ss0 = KERNEL_DS;
Thread->Tcb.Context.esp = Context->Esp;
Thread->Tcb.Context.ss = Context->SegSs;
Thread->Tcb.Context.cs = Context->SegCs;
Thread->Tcb.Context.eip = Context->Eip;
Thread->Tcb.Context.esp = stack_start;
Thread->Tcb.Context.ss = KERNEL_DS;
Thread->Tcb.Context.cs = KERNEL_CS;
Thread->Tcb.Context.eip = PsBeginThreadWithContextInternal;
Thread->Tcb.Context.io_bitmap[0] = 0xff;
Thread->Tcb.Context.cr3 =
linear_to_physical(Thread->ThreadsProcess->Pcb.PageTableDirectory);
Thread->Tcb.Context.ds = Context->SegDs;
Thread->Tcb.Context.es = Context->SegEs;
Thread->Tcb.Context.fs = Context->SegFs;
Thread->Tcb.Context.gs = Context->SegGs;
Thread->Tcb.Context.eax = Context->Eax;
Thread->Tcb.Context.ebx = Context->Ebx;
Thread->Tcb.Context.ecx = Context->Ecx;
Thread->Tcb.Context.edx = Context->Edx;
Thread->Tcb.Context.edi = Context->Edi;
Thread->Tcb.Context.esi = Context->Esi;
Thread->Tcb.Context.ebp = Context->Ebp;
Thread->Tcb.Context.ds = KERNEL_DS;
Thread->Tcb.Context.es = KERNEL_DS;
Thread->Tcb.Context.fs = KERNEL_DS;
Thread->Tcb.Context.gs = KERNEL_DS;
Thread->Tcb.Context.nr = desc * 8;
DPRINT("Allocated %x\n",desc*8);
@ -267,6 +254,13 @@ BOOLEAN HalInitTask(PETHREAD thread, PKSTART_ROUTINE fn, PVOID StartContext)
gdt[desc].b = ((base & 0xff0000)>>16) | 0x8900 | (length & 0xf0000)
| (base & 0xff000000);
// DPRINT("sizeof(descriptor) %d\n",sizeof(descriptor));
// DPRINT("desc %d\n",desc);
DPRINT("&gdt[desc].a %.8x gdt[desc].a %.8x\ngdt[desc].b %.8x\n",
&(gdt[desc].a),
gdt[desc].a,
gdt[desc].b);
/*
* Initialize the stack for the thread (including the two arguments to
* the general start routine).
@ -287,7 +281,7 @@ BOOLEAN HalInitTask(PETHREAD thread, PKSTART_ROUTINE fn, PVOID StartContext)
thread->Tcb.Context.esp = &kernel_stack[1021];
thread->Tcb.Context.ss = KERNEL_DS;
thread->Tcb.Context.cs = KERNEL_CS;
thread->Tcb.Context.eip = (unsigned long)begin_thread;
thread->Tcb.Context.eip = (unsigned long)PsBeginThread;
thread->Tcb.Context.io_bitmap[0] = 0xff;
thread->Tcb.Context.cr3 =
linear_to_physical(thread->ThreadsProcess->Pcb.PageTableDirectory);