ptos: bpal: Obtain ACPI RSDP pointer

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

service/ptos/head/ke/bpal.h

@@ -62,11 +62,13 @@ typedef struct {
  * layer containing data filled in by the bootloader.
  *
  * @KernelBase:     Represents the kernel load base
+ * @RsdpBase:       RSDP base address
  * @Framebuffer:    Framebuffer information
  * @MemEntryIdx:    Callback to get memory map entry by index
  */
 typedef struct {
     UPTR KernelBase;
+    VOID *RsdpBase;
     BPAL_FRAMEBUFFER Framebuffer;
     PT_STATUS(*MemEntryIdx)(USIZE Idx, MEMMAP_ENTRY *Result);
 } BPAL_HANDLE;

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

@@ -32,6 +32,13 @@ static volatile struct limine_memmap_request MapReq = {
     .revision = 0
 };
 
+/* RSDP request */
+static struct limine_rsdp_response *RsdpResp = NULL;
+static volatile struct limine_rsdp_request RsdpReq = {
+    .id = LIMINE_RSDP_REQUEST_ID,
+    .revision = 0
+};
+
 static PT_STATUS
 LimineMemEntryIdx(USIZE Idx, MEMMAP_ENTRY *Result)
 {
@@ -80,8 +87,10 @@ KeBpalLimineInit(BPAL_HANDLE *Result)
     HHDMResp = HHDMReq.response;
     FbResp = FbReq.response;
     MapResp = MapReq.response;
+    RsdpResp = RsdpReq.response;
 
     Result->KernelBase = HHDMResp->offset;
     Result->MemEntryIdx = LimineMemEntryIdx;
+    Result->RsdpBase = RsdpResp->address;
     BpalInitFramebuffer(Result);
 }