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acpi/acpi.c: Fix einj generation pointer arithmetics 

Without a cast the aritmetics of

tat = einj + sizeof(acpi_einj_smi_t)

is the same as

tat = (uintptr_t)einj + size(acpi_einj_smi_t) * size(acpi_einj_smi_t)

So it overshoots the intended offset by a lot.

This issue only came apparent because now einj is in the small IMD
region which is close to TSEG. With the wrong aritmetics the tat
pointer ended up inside TSEG which is not accessible from the OS
causing exceptions.

TEST: observe that tat pointer is inside the small IMD below
TSEG (0x78000000 on our setup).
"acpi_create_einj trigger_action_table = 0x77ffe89c"

Change-Id: I3ab64b95c33eef01b2048816a21e17855bcb2f54
Signed-off-by: Arthur Heymans <arthur.heymans@9elements.com>
Signed-off-by: Jonathan Zhang <jonzhang@meta.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69326
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
This commit is contained in:
Jonathan Zhang 2022-11-07 17:30:14 -08:00 committed by Felix Held
parent aba1c945cd
commit d5d9b280de
1 changed files with 1 additions and 1 deletions
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2
src/acpi/acpi.c
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@ -888,7 +888,7 @@ void acpi_create_einj(acpi_einj_t *einj, uintptr_t addr, u8 actions)
printk(BIOS_DEBUG, "%s einj_smi = %p\n", __func__, einj_smi);
memset(einj_smi, 0, sizeof(acpi_einj_smi_t));
tat = (acpi_einj_trigger_table_t *)(einj_smi + sizeof(acpi_einj_smi_t));
tat = (acpi_einj_trigger_table_t *)((uint8_t *)einj_smi + sizeof(acpi_einj_smi_t));
tat->header_size = 16;
tat->revision = 0;
tat->table_size = sizeof(acpi_einj_trigger_table_t) +