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Kernel: Ensure that we receive IRQs in PIO mode when IOAPIC is enabled

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The IOAPIC manual states that "Interrupt Mask-R/W. When this bit is 1,
the interrupt signal is masked. Edge-sensitive interrupts signaled on
a masked interrupt pin are ignored." - Therefore we have to ensure that
we disable interrupts globally with cli(), but also to ensure that we
invoke enable_irq() before sending the hardware command that generates
an IRQ almost immediately.
This commit is contained in:
Liav A 2020-04-15 15:46:36 +03:00 committed by Andreas Kling
parent 4c0ec846a8
commit d6318f2cc6
Notes: sideshowbarker 2024-07-19 07:34:46 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/d6318f2cc67
Pull-request: https://github.com/SerenityOS/serenity/pull/1808
Issue: https://github.com/SerenityOS/serenity/issues/1744
1 changed files with 9 additions and 2 deletions
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11
Kernel/Devices/PATAChannel.cpp
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@ -183,6 +183,8 @@ void PATAChannel::wait_for_irq()
void PATAChannel::handle_irq(const RegisterState&)
{
// FIXME: We might get random interrupts due to malfunctioning hardware, so we should check that we actually requested something to happen.
u8 status = m_io_base.offset(ATA_REG_STATUS).in<u8>();
if (status & ATA_SR_ERR) {
print_ide_status(status);
@ -443,6 +445,7 @@ bool PATAChannel::ata_read_sectors(u32 lba, u16 count, u8* outbuf, bool slave_re
break;
}
prepare_for_irq();
m_io_base.offset(ATA_REG_COMMAND).out<u8>(ATA_CMD_READ_PIO);
for (int i = 0; i < count; i++) {
@ -458,10 +461,15 @@ bool PATAChannel::ata_read_sectors(u32 lba, u16 count, u8* outbuf, bool slave_re
#ifdef PATA_DEBUG
dbg() << "PATAChannel: Retrieving 512 bytes (part " << i << ") (status=" << String::format("%b", status) << "), outbuf=(" << buffer << ")...";
#endif
prepare_for_irq();
for (int i = 0; i < 256; i++) {
buffer[i] = IO::in16(m_io_base.offset(ATA_REG_DATA).get());
}
}
sti();
disable_irq();
return true;
}
@ -507,12 +515,11 @@ bool PATAChannel::ata_write_sectors(u32 start_sector, u16 count, const u8* inbuf
#ifdef PATA_DEBUG
dbg() << "PATAChannel: Writing 512 bytes (part " << i << ") (status=" << String::format("%b", status) << "), inbuf=(" << (inbuf + (512 * i)) << ")...";
#endif
prepare_for_irq();
auto* buffer = (u16*)(const_cast<u8*>(inbuf) + i * 512);
for (int i = 0; i < 256; i++) {
IO::out16(m_io_base.offset(ATA_REG_DATA).get(), buffer[i]);
}
prepare_for_irq();
wait_for_irq();
status = m_io_base.offset(ATA_REG_STATUS).in<u8>();
ASSERT(!(status & ATA_SR_BSY));