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cpu/x86/lapic: Do not set read-only bits in LVTx 

The bits REMOTE_IRR and SEND_PENDING are documented as read-only,
and reserved bits should not be modified either.

Change-Id: I6bcb9eb990debe169340a0bfe662158b62a8f4dc
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55700
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Kyösti Mälkki 2021-06-20 14:58:36 +03:00
parent 90f54c9b8f
commit 7da871ef49
1 changed files with 3 additions and 7 deletions
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10
src/cpu/x86/lapic/lapic.c
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@ -52,16 +52,12 @@ static void lapic_virtual_wire_mode_init(void)
lapic_update32(LAPIC_SPIV, ~LAPIC_VECTOR_MASK, LAPIC_SPIV_ENABLE);
/* Put the local APIC in virtual wire mode */
uint32_t mask = LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER | LAPIC_LVT_REMOTE_IRR |
LAPIC_INPUT_POLARITY | LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
uint32_t mask = LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER | LAPIC_INPUT_POLARITY |
LAPIC_DELIVERY_MODE_MASK;
lapic_update32(LAPIC_LVT0, ~mask, LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
LAPIC_DELIVERY_MODE_EXTINT);
lapic_update32(LAPIC_LVT1, ~mask, LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
LAPIC_DELIVERY_MODE_NMI);
lapic_update32(LAPIC_LVT0, ~mask, LAPIC_DELIVERY_MODE_EXTINT);
lapic_update32(LAPIC_LVT1, ~mask, LAPIC_DELIVERY_MODE_NMI);
}
void setup_lapic(void)