Implement APIC, RTC, basic ACPI parser and timer support

[lunaix-os.git] / lunaix-os / hal / acpi / parser / madt_parser.c

diff --git a/lunaix-os/hal/acpi/parser/madt_parser.c b/lunaix-os/hal/acpi/parser/madt_parser.c
new file mode 100644 (file)
index 0000000..baa866c
--- /dev/null
+++ b/lunaix-os/hal/acpi/parser/madt_parser.c
@@ -0,0 +1,40 @@
+#include "madt_parser.h"
+#include <lunaix/mm/kalloc.h>
+
+void
+madt_parse(acpi_madt_t* madt, acpi_context* toc)
+{
+    toc->madt.apic_addr = madt->apic_addr;
+
+    // FUTURE: make madt.{apic,ioapic} as array or linked list.
+    uint8_t* ics_start = (uint8_t*)((uintptr_t)madt + sizeof(acpi_madt_t));
+    uintptr_t ics_end = (uintptr_t)madt + madt->header.length;
+
+    // Cosidering only one IOAPIC present (max 24 pins)
+    // FIXME: use hash table instead
+    toc->madt.irq_exception =
+      (acpi_intso_t*)lxcalloc(24, sizeof(acpi_intso_t*));
+
+    size_t so_idx = 0;
+    while (ics_start < ics_end) {
+        acpi_ics_hdr_t* entry = (acpi_ics_hdr_t*)ics_start;
+        switch (entry->type) {
+            case ACPI_MADT_LAPIC:
+                toc->madt.apic = (acpi_apic_t*)entry;
+                break;
+            case ACPI_MADT_IOAPIC:
+                toc->madt.ioapic = (acpi_ioapic_t*)entry;
+                break;
+            case ACPI_MADT_INTSO:
+            {
+                acpi_intso_t* intso_tbl = (acpi_intso_t*)entry;
+                toc->madt.irq_exception[intso_tbl->source] = intso_tbl;
+                break;
+            }
+            default:
+                break;
+        }
+
+        ics_start += entry->length;
+    }
+}
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