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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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23
Kernel/i386.cpp
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@ -20,15 +20,20 @@ static Descriptor* s_gdt;
static IRQHandler** s_irqHandler;
static Vector<word, KmallocEternalAllocator>* s_gdt_freelist;
static WORD s_gdtLength;
WORD allocateGDTEntry()
word gdt_alloc_entry()
{
// FIXME: This should not grow indefinitely.
ASSERT(s_gdtLength < 256);
WORD newGDTEntry = s_gdtLength * 8;
s_gdtLength++;
return newGDTEntry;
ASSERT(s_gdt_freelist);
ASSERT(!s_gdt_freelist->isEmpty());
return s_gdt_freelist->takeLast();
}
void gdt_free_entry(word entry)
{
s_gdt_freelist->append(entry);
}
extern "C" void handleIRQ();
@ -310,6 +315,12 @@ void gdt_init()
s_gdt = static_cast<Descriptor*>(kmalloc_eternal(sizeof(Descriptor) * 256));
s_gdtLength = 5;
s_gdt_freelist = new Vector<word, KmallocEternalAllocator>();
s_gdt_freelist->ensureCapacity(256);
for (size_t i = s_gdtLength; i < 256; ++i)
s_gdt_freelist->uncheckedAppend(i * 8);
s_gdtLength = 256;
s_gdtr.address = s_gdt;
s_gdtr.size = (s_gdtLength * 8) - 1;