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acpica: avoid special mmio address request

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Add special handling for root bridge access for

12th Gen Framework laptop and Thinkpad X1 Nano Gen2

to avoid bogus MMIO memory accesses as seen in #5234 and #4643.

Fixes #5234
This commit is contained in:
Alexander Boettcher 2024-06-11 13:21:09 +02:00 committed by Norman Feske
parent a12ff58674
commit ba473134da
1 changed files with 31 additions and 0 deletions
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31
repos/libports/src/lib/acpica/pci.cc
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@ -41,6 +41,17 @@ struct Bdf
};
static bool cpu_name(char const * name)
{
unsigned cpuid = 0, edx = 0, ebx = 0, ecx = 0;
asm volatile ("cpuid" : "+a" (cpuid), "=d" (edx), "=b"(ebx), "=c"(ecx));
return ebx == *reinterpret_cast<unsigned const *>(name + 0) &&
edx == *reinterpret_cast<unsigned const *>(name + 4) &&
ecx == *reinterpret_cast<unsigned const *>(name + 8);
}
/*************************
* Acpica PCI OS backend *
*************************/
@ -54,6 +65,26 @@ ACPI_STATUS AcpiOsReadPciConfiguration (ACPI_PCI_ID *pcidev, UINT32 reg,
Bdf bdf(pcidev->Bus, pcidev->Device, pcidev->Function);
bool const intel = cpu_name("GenuineIntel");
bool const emulate = intel &&
!pcidev->Bus && !pcidev->Device && !pcidev->Function;
/*
* ACPI quirk for 12th Gen Framework laptop and Thinkpad X1 Nano Gen2
*
* XXX emulate some of the register accesses to the Intel root bridge to
* avoid bogus calculation of physical addresses. The value seems to
* be close to the pci config start address as provided by mcfg table
* for those machines.
*/
if (emulate) {
if (reg == 0x60 && width == 32) {
*value = 0xe0000001;
warning(bdf, " emulate read ", Hex(reg), " -> ", Hex(*value));
return AE_OK;
}
}
/* during startup suppress errors */
if (!(AcpiDbgLevel & ACPI_LV_INIT))
error(__func__, " ", bdf, " ", Hex(reg), " width=", width);