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Add suspend_interrupts() and resume_interrupts()

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This commit is contained in:
Josh Holtrop 2023-11-21 11:36:22 -05:00
parent aa5ca83889
commit bb4404df23
2 changed files with 35 additions and 2 deletions
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31
src/hulk/cpu.d
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@ -135,6 +135,37 @@ enum uint CPUID_1_ECX_RDRND = 0x4000_0000u;
enum uint CPUID_1_ECX_HYPERVISOR = 0x8000_0000u;
/** @} */
/** Interrupt suspend level (0 when interrupts are enabled). */
private __gshared size_t intr_suspend_level;
/**
* Suspend interrupts.
*
* This function disables interrupts. Calls can be nested and interrupts will
* be enabled only when the outermost pair of
* suspend_interrupts()/resume_interrupts() is complete.
*/
void suspend_interrupts()
{
cli();
intr_suspend_level++;
}
/**
* Resume interrupts.
*
* Calls can be nested and interrupts will be enabled only when the outermost
* pair of suspend_interrupts()/resume_interrupts() is complete.
*/
void resume_interrupts()
{
intr_suspend_level--;
if (intr_suspend_level == 0)
{
sti();
}
}
void cli()
{
__asm("cli", "");

6
src/hulk/hulk.d
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@ -58,7 +58,8 @@ private void initialize_cpu()
*/
void hulk_start()
{
cli();
suspend_interrupts();
initialize_cpu();
Serial.initialize();
Gdt.initialize();
@ -86,7 +87,8 @@ void hulk_start()
Pit.initialize();
Pci.initialize();
Usb.initialize();
sti();
resume_interrupts();
/* Check that PIT millisecond interrupt is firing. */
size_t uptime = Time.uptime();