sp1: bpt: Add RSDP field to protovars

Signed-off-by: Ian Moffett <ian@mirocom.org>

usr/src/sp1/common/bpt/bpt_limine.c

@@ -27,6 +27,13 @@ static volatile struct limine_hhdm_request hhdm_req = {
     .revision = 0
 };
 
+/* ACPI RSDP request */
+static struct limine_rsdp_response *rsdp_resp = NULL;
+static volatile struct limine_rsdp_request rsdp_req = {
+    .id = LIMINE_RSDP_REQUEST,
+    .revision = 0
+};
+
 /*
  * Obtain the boot protocol variables
  *
@@ -40,6 +47,7 @@ limine_get_protovar(struct bpt_protovar *res)
     }
 
     res->kload_base = hhdm_resp->offset;
+    res->rsdp = rsdp_resp->address;
     return STATUS_SUCCESS;
 }
 
@@ -80,6 +88,7 @@ bpt_init_limine(struct bpt_ops *ops)
 
     hhdm_resp = hhdm_req.response;
     memmap_resp = memmap_req.response;
+    rsdp_resp = rsdp_req.response;
 
     ops->get_protovar = limine_get_protovar;
     ops->mem_entry_i = limine_mem_entry_i;

usr/src/sp1/head/os/bpt.h

@@ -52,6 +52,7 @@ struct mem_entry {
  */
 struct bpt_protovar {
     uintptr_t kload_base;
+    void *rsdp;
 };
 
 /*