Add RSDP address to loader_struct

lib/kernel-common/src/loader_struct.rs

@@ -10,6 +10,7 @@ pub struct LoaderStruct {
     pub magic: u64,
     pub phys_kernel_start: u64,
     pub phys_heap_start: u64,
+    pub rsdp_address: u64,
     pub available_memory: [LoaderStructMemoryRegion; 1024],
 }
 

loader/src/loader_struct.rs

@@ -1,11 +1,12 @@
 use kernel_common::loader_struct::{LoaderStruct, LoaderStructMemoryRegion, LOADER_STRUCT_MAGIC};
 use uefi::table::boot::{MemoryMap, MemoryType};
 
-pub fn generate_loader_struct(memory_map: &MemoryMap, phys_start: u64, heap_start: u64) -> LoaderStruct {
+pub fn generate_loader_struct(memory_map: &MemoryMap, phys_start: u64, heap_start: u64, rsdp_address: u64) -> LoaderStruct {
     let mut loader_struct = LoaderStruct {
         magic: LOADER_STRUCT_MAGIC,
         phys_kernel_start: phys_start,
         phys_heap_start: heap_start,
+        rsdp_address,
         available_memory: [LoaderStructMemoryRegion { initial_page: 0, page_count: 0 }; 1024],
     };
     let mut next_entry = 0;

loader/src/main.rs

@@ -44,13 +44,23 @@ fn main(image_handle: Handle, mut system_table: SystemTable<Boot>) -> Status {
         .boot_services()
         .allocate_pages(AllocateType::AnyPages, MemoryType::LOADER_DATA, KERNEL_HEAP_INITIAL_SIZE / 0x1000)
         .unwrap();
+    let mut rsdp = 0;
+    for i in system_table.config_table() {
+        if i.guid == uefi::table::cfg::ACPI2_GUID {
+            rsdp = i.address as u64;
+            break;
+        }
+    }
+    if rsdp == 0 {
+        panic!("RSDP not found");
+    }
     let memory_map;
     unsafe {
         memory_map = system_table.exit_boot_services(MemoryType::LOADER_DATA).1;
     }
     let pml4 = setup_paging(&memory_map, heap_start);
     map_kernel(KERNEL, pml4, kernel_start);
-    let loader_struct = generate_loader_struct(&memory_map, kernel_start, heap_start);
+    let loader_struct = generate_loader_struct(&memory_map, kernel_start, heap_start, rsdp);
     info!("Jumping to kernel...");
     unsafe {
         (mem::transmute::<_, extern "C" fn(&LoaderStruct) -> !>(kernel_entry))(&loader_struct);