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| /freebsd-11-stable/sys/x86/acpica/ | ||
| H A D | madt.c | diff 122502 Tue Nov 11 16:20:10 MST 2003 jhb Some motherboards like to remap the SCI (normally IRQ 9) up to a PCI interrupt such as IRQ 22 or 19. However, the ACPI BIOS still routes interrupts from some PCI devices to the same intpin calling the pin IRQ 22. Thus, ACPI expects to address a single interrupt source via two different names. To work around this, if the SCI is remapped to a non-ISA interrupt (i.e., greater than 15), then we use acpi_OverrideInterruptLevel() function to tell ACPI to use IRQ 22 or 19 rather than IRQ 9 for the SCI. Previously we would change IRQ 22 or 19's name to IRQ 9 when we encountered such an Interrupt Source Override entry in the MADT which routed the SCI properly but left PCI devices mapped to IRQ 22 or 19 w/o a routable interrupt. Tested by: sos |
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