lunaix-os/hal/acpi/parser/madt_parser.c

   1 #include "parser.h"
   2 #include <lunaix/mm/valloc.h>
   3
   4 void
   5 madt_parse(acpi_madt_t* madt, acpi_context* toc)
   6 {
   7     toc->madt.apic_addr = madt->apic_addr;
   8
   9     // FUTURE: make madt.{apic,ioapic} as array or linked list.
  10     uint8_t* ics_start = (uint8_t*)((uintptr_t)madt + sizeof(acpi_madt_t));
  11     uintptr_t ics_end = (uintptr_t)madt + madt->header.length;
  12
  13     // Cosidering only one IOAPIC present (max 24 pins)
  14     toc->madt.irq_exception =
  15       (acpi_intso_t**)vcalloc(24, sizeof(acpi_intso_t*));
  16
  17     size_t so_idx = 0;
  18     while (ics_start < ics_end) {
  19         acpi_ics_hdr_t* entry = (acpi_ics_hdr_t*)ics_start;
  20         switch (entry->type) {
  21             case ACPI_MADT_LAPIC:
  22                 toc->madt.apic = (acpi_apic_t*)entry;
  23                 break;
  24             case ACPI_MADT_IOAPIC:
  25                 toc->madt.ioapic = (acpi_ioapic_t*)entry;
  26                 break;
  27             case ACPI_MADT_INTSO: {
  28                 acpi_intso_t* intso_tbl = (acpi_intso_t*)entry;
  29                 toc->madt.irq_exception[intso_tbl->source] = intso_tbl;
  30                 break;
  31             }
  32             default:
  33                 break;
  34         }
  35
  36         ics_start += entry->length;
  37     }
  38 }