RTEMS | amd64: Restructure the APIC code (!168)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on bsps/x86_64/amd64/interrupts/apic.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/168#note_110605

 > + * When the CPUID instruction is executed with a source operand of 1 in the EAX
 > + * register, bit 9 of the CPUID feature flags returned in the EDX register
 > + * indicates the presence (set) or absence (clear) of a local APIC.
 > + *
 > + * @return true if CPUID reports the presence of a local APIC.
 > + */
 > +static bool has_lapic_support(void)
 > +{
 > +  uint32_t eax, ebx, ecx, edx;
 > +  cpuid(1, &eax, &ebx, &ecx, &edx);
 > +  return (edx >> 9) & 1;
 > +}
 > +
 > +/**
 > + * @brief Passed to acpi_walk_subtables to parse information from MADT entries
 > + */

The parameter is not documented here.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/168#note_110605
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