ptos: bpal: Add memory map interface

Signed-off-by: Chloe M. <chloe@mensia.org>

service/ptos/ke/bpal/proto/limine.c

@@ -25,7 +25,30 @@ static volatile struct limine_hhdm_request HHDMReq = {
     .revision = 0
 };
 
-VOID
+/* Memory map request */
+static struct limine_memmap_response *MapResp = NULL;
+static volatile struct limine_memmap_request MapReq = {
+    .id = LIMINE_MEMMAP_REQUEST_ID,
+    .revision = 0
+};
+
+static PT_STATUS
+LimineMemEntryIdx(USIZE Idx, MEMMAP_ENTRY *Result)
+{
+    struct limine_memmap_entry *Entry;
+
+    if (Idx >= MapResp->entry_count) {
+        return STATUS_NOT_FOUND;
+    }
+
+    Entry = MapResp->entries[Idx];
+    Result->Base = Entry->base;
+    Result->Length = Entry->length;
+    Result->Type = Entry->type;
+    return STATUS_SUCCESS;
+}
+
+static VOID
 BpalInitFramebuffer(BPAL_HANDLE *Handle)
 {
     BPAL_FRAMEBUFFER *Framebuffer;
@@ -56,7 +79,9 @@ KeBpalLimineInit(BPAL_HANDLE *Result)
 
     HHDMResp = HHDMReq.response;
     FbResp = FbReq.response;
+    MapResp = MapReq.response;
 
     Result->KernelBase = HHDMResp->offset;
+    Result->MemEntryIdx = LimineMemEntryIdx;
     BpalInitFramebuffer(Result);
 }