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Use a freelist for GDT entries.

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Tweak the kmalloc space layout a bit. Get the spawn stress test up
and running again.
This commit is contained in:
Andreas Kling
2018-11-01 16:23:12 +01:00
parent 9da4864a9a
commit c70afd045e
6 changed files with 40 additions and 21 deletions
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22
Kernel/Process.cpp
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@@ -62,7 +62,7 @@ static bool contextSwitch(Process*);
static void redoKernelProcessTSS()
{
if (!s_kernelProcess->selector())
s_kernelProcess->setSelector(allocateGDTEntry());
s_kernelProcess->setSelector(gdt_alloc_entry());
auto& tssDescriptor = getGDTEntry(s_kernelProcess->selector());
@@ -109,14 +109,14 @@ void Process::allocateLDT()
{
ASSERT(!m_tss.ldt);
static const WORD numLDTEntries = 4;
WORD newLDTSelector = allocateGDTEntry();
m_ldt_selector = gdt_alloc_entry();
m_ldtEntries = new Descriptor[numLDTEntries];
#if 0
kprintf("new ldt selector = %x\n", newLDTSelector);
kprintf("new ldt selector = %x\n", m_ldt_selector);
kprintf("new ldt table at = %p\n", m_ldtEntries);
kprintf("new ldt table size = %u\n", (numLDTEntries * 8) - 1);
#endif
Descriptor& ldt = getGDTEntry(newLDTSelector);
Descriptor& ldt = getGDTEntry(m_ldt_selector);
ldt.setBase(m_ldtEntries);
ldt.setLimit(numLDTEntries * 8 - 1);
ldt.dpl = 0;
@@ -126,7 +126,7 @@ void Process::allocateLDT()
ldt.operation_size = 1;
ldt.descriptor_type = 0;
ldt.type = Descriptor::LDT;
m_tss.ldt = newLDTSelector;
m_tss.ldt = m_ldt_selector;
}
Vector<Process*> Process::allProcesses()
@@ -489,8 +489,14 @@ Process::~Process()
InterruptDisabler disabler;
ProcFileSystem::the().removeProcess(*this);
system.nprocess--;
delete [] m_ldtEntries;
m_ldtEntries = nullptr;
if (isRing3()) {
delete [] m_ldtEntries;
m_ldtEntries = nullptr;
gdt_free_entry(m_ldt_selector);
}
gdt_free_entry(selector());
if (m_kernelStack) {
kfree(m_kernelStack);
@@ -754,7 +760,7 @@ static bool contextSwitch(Process* t)
t->set_state(Process::Running);
if (!t->selector()) {
t->setSelector(allocateGDTEntry());
t->setSelector(gdt_alloc_entry());
auto& descriptor = getGDTEntry(t->selector());
descriptor.setBase(&t->tss());
descriptor.setLimit(0xffff);