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Sunzi
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És a lényeg tömören, szintén a speckóbol:
5.2.11 Global System Interrupts
Global System Interrupts can be thought of as ACPI Plug and Play IRQ numbers. They are used to virtualize interrupts in tables and in ASL methods that perform resource allocation of interrupts. Do not confuse global system interrupts with ISA IRQs although in the case of the IA-PC 8259 interrupts they correspond in a one-to-one fashion.
There are two interrupt models used in ACPI-enabled systems.
The first model is the APIC model. In the APIC model, the number of interrupt inputs supported by each I/O APIC can vary. OSPM determines the mapping of the Global System Interrupts by determining how many interrupt inputs each I/O APIC supports and by determining the global system interrupt base for each I/O APIC as specified by the I/O APIC Structure. OSPM determines the number of interrupt inputs by reading the Max Redirection register from the I/O APIC. The global system interrupts mapped to that I/O APIC begin at the global system interrupt base and extending through the number of interrupts specified in the Max Redirection register. This mapping is depicted in Figure 5-3.
The other interrupt model is the standard AT style mentioned above which uses ISA IRQs attached to a master slave pair of 8259 PICs. The system vectors correspond to the ISA IRQs. The ISA IRQs and their mappings to the 8259 pair are part of the AT standard and are well defined. This mapping is depicted in Figure 5-4.
Ma is okosabb lettem :)
S. -
Sunzi
aktív tag
És valóban :)
Mindenesetre részlet a fenti linkből(ACPI spec):
5.2.10.4 Multiple APIC Description Table (MADT)
The ACPI interrupt model describes all interrupts for the entire system in a uniform interrupt model implementation. Supported interrupt models include the PC-AT–compatible dual 8259 interrupt controller and, for Intel processor-based systems, the Intel Advanced Programmable Interrupt Controller (APIC) and Intel Streamlined Advanced Programmable Interrupt Controller (SAPIC). The choice of the interrupt model(s) to support is up to the platform designer. The interrupt model cannot be dynamically changed by the system firmware; OSPM will choose which model to use and install support for that model at the time of installation. If a platform supports both models, an OS will install support for one model or the other; it will not mix models. Multi-boot capability is a feature in many modern operating systems. This means that a system may have multiple operating systems or multiple instances of an OS installed at any one time. Platform designers must allow for this.
This section describes the format of the Multiple APIC Description Table (MADT), which provides OSPM with information necessary for operation on systems with APIC or SAPIC implementations.
ACPI represents all interrupts as “flat” values known as global system interrupts. Therefore to support APICs or SAPICs on an ACPI-enabled system, each used APIC or SAPIC interrupt input must be mapped to the global system interrupt value used by ACPI. See Section 5.2.11. Global System Interrupts,” for a description of Global System Interrupts.
Additional support is required to handle various multi-processor functions that APIC or SAPIC implementations might support (for example, identifying each processor’s local APIC ID).
All addresses in the MADT are processor-relative physical addresses
Így kicsit jobban értem...
S. -
Sunzi
aktív tag
Azannyát :)
Advanced Configuration and Power Interface. Én is elszúrtam, de az APIC is ismerős, csak nem jöttem rá, honnan :)
Annyi vele a gond, hogy (tapasztalatom szerint), hogy egyes tunerkártyák nem viselik el, ha másik eszközt ugyanarra az IRQ-ra rak az ACPI. Mélyebben magyarul nem vállalom, hogy belemenjek... info: [L]http://www.acpi.info/spec.htm[/L]
S.
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