diff options
Diffstat (limited to 'Kernel')
| -rw-r--r-- | Kernel/Task.cpp | 32 |
1 files changed, 15 insertions, 17 deletions
diff --git a/Kernel/Task.cpp b/Kernel/Task.cpp index 146ee8ec90..19d038550b 100644 --- a/Kernel/Task.cpp +++ b/Kernel/Task.cpp @@ -720,13 +720,13 @@ bool scheduleNewTask() static bool contextSwitch(Task* t) { - //kprintf("c_s to %s (same:%u)\n", t->name().characters(), current == t); t->setTicksLeft(5); t->didSchedule(); if (current == t) return false; +#ifdef SCHEDULER_DEBUG // Some sanity checking to force a crash earlier. auto csRPL = t->tss().cs & 3; auto ssRPL = t->tss().ss & 3; @@ -740,6 +740,7 @@ static bool contextSwitch(Task* t) kprintf(" stk: %w:%x\n", t->tss().ss, t->tss().esp); ASSERT(csRPL == ssRPL); } +#endif if (current) { // If the last task hasn't blocked (still marked as running), @@ -751,24 +752,21 @@ static bool contextSwitch(Task* t) current = t; t->setState(Task::Running); - if (!t->selector()) + if (!t->selector()) { t->setSelector(allocateGDTEntry()); + auto& descriptor = getGDTEntry(t->selector()); + descriptor.setBase(&t->tss()); + descriptor.setLimit(0xffff); + descriptor.dpl = 0; + descriptor.segment_present = 1; + descriptor.granularity = 1; + descriptor.zero = 0; + descriptor.operation_size = 1; + descriptor.descriptor_type = 0; + } - auto& tssDescriptor = getGDTEntry(t->selector()); - - tssDescriptor.limit_hi = 0; - tssDescriptor.limit_lo = 0xFFFF; - tssDescriptor.base_lo = (DWORD)(&t->tss()) & 0xFFFF; - tssDescriptor.base_hi = ((DWORD)(&t->tss()) >> 16) & 0xFF; - tssDescriptor.base_hi2 = ((DWORD)(&t->tss()) >> 24) & 0xFF; - tssDescriptor.dpl = 0; - tssDescriptor.segment_present = 1; - tssDescriptor.granularity = 1; - tssDescriptor.zero = 0; - tssDescriptor.operation_size = 1; - tssDescriptor.descriptor_type = 0; - tssDescriptor.type = 11; // Busy TSS - + auto& descriptor = getGDTEntry(t->selector()); + descriptor.type = 11; // Busy TSS flushGDT(); return true; } |