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devices: ioapic: Tolerate Windows writing zero to version register

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Windows will write zero to the IOAPIC version register as part of
probing if the device is there.

Fixes: #1791

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-10-06 15:57:45 +01:00
parent 162789a2d1
commit 00c0b9e170
1 changed files with 18 additions and 2 deletions
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20
devices/src/ioapic.rs
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@ -214,6 +214,16 @@ impl Ioapic {
debug!("IOAPIC_W reg 0x{:x}, val 0x{:x}", self.reg_sel, val);
match self.reg_sel as u8 {
IOAPIC_REG_VERSION => {
if val == 0 {
// Windows writes zero here (see #1791)
} else {
error!(
"IOAPIC: invalid write to version register (0x{:x}): 0x{:x}",
self.reg_sel, val
);
}
}
IOAPIC_REG_ID => self.id_reg = (val >> 24) & 0xf,
IOWIN_OFF..=REG_MAX_OFFSET => {
let (index, is_high_bits) = decode_irq_from_selector(self.reg_sel as u8);
@ -235,7 +245,10 @@ impl Ioapic {
// Store the information this IRQ is now being used.
self.used_entries[index] = true;
}
_ => error!("IOAPIC: invalid write to register offset"),
_ => error!(
"IOAPIC: invalid write to register offset 0x{:x}",
self.reg_sel
),
}
}
@ -254,7 +267,10 @@ impl Ioapic {
}
}
_ => {
error!("IOAPIC: invalid read from register offset");
error!(
"IOAPIC: invalid read from register offset 0x{:x}",
self.reg_sel
);
0
}
}