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Turn the syscall interrupt into a trap (by switching the gate type.)

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This leaves interrupts enabled while we're in the kernel, which is
precisely what we want.

This uncovered a horrendous problem with kernel tasks silently
overflowing their stacks. For now I've simply increased the stack size
but I need a more MMU-y solution for this eventually.
This commit is contained in:
Andreas Kling 2018-10-19 11:28:43 +02:00
parent 2d1d01661b
commit 46ff281695
6 changed files with 116 additions and 25 deletions
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4
Kernel/i386.h
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@ -72,8 +72,8 @@ void writeGDTEntry(WORD selector, Descriptor&);
#define LSB(x) ((x) & 0xFF)
#define MSB(x) (((x)>>8) & 0xFF)
#define disableInterrupts() asm volatile("cli");
#define enableInterrupts() asm volatile("sti");
#define cli() asm volatile("cli")
#define sti() asm volatile("sti")
/* Map IRQ0-15 @ ISR 0x50-0x5F */
#define IRQ_VECTOR_BASE 0x50