1 files changed, 69 insertions, 0 deletions
diff --git a/kernel/entry.c b/kernel/entry.c
new file mode 100644
index 0000000..5eecaf2
--- /dev/null
+++ b/kernel/entry.c
@@ -0,0 +1,69 @@
+#include "cpu.h"
+#include "serial.h"
+#include "kprint.h"
+#include "memory.h"
+#include "panic.h"
+
+#include <loader/data_efi.h>
+
+#include <kernel/entry.h>
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdnoreturn.h>
+
+static void efi_memory_init(struct efi_memory_map_data *map)
+{
+    // FIXME: bad girl shit: overwriting on aliased pointers.
+    // this is a temporary solution to shortcomings with
+    // loader boot data. it's sort-of OK because the memory_range struct
+    // is smaller than EFI_MEMORY_DESCRIPTOR. it's still not good.
+    struct memory_range *ranges = (struct memory_range *)map->data;
+    int entries = map->size / map->descsize;
+
+    for (int i = 0; i < entries; i++)
+    {
+        EFI_MEMORY_DESCRIPTOR *desc;
+        desc = (EFI_MEMORY_DESCRIPTOR *)((char *)map->data + i * map->descsize);
+
+        enum memory_range_type type;
+        phys_addr_t base;
+        size_t size;
+        
+        base = desc->PhysicalStart;
+        size = desc->NumberOfPages * EFI_PAGE_SIZE;
+        
+        switch (desc->Type)
+        {
+            case EfiConventionalMemory:
+            case EfiBootServicesData:
+            case EfiBootServicesCode:
+            case EfiLoaderData:
+            case EfiLoaderCode:
+                type = AVAILABLE_MEMORY;
+                break;
+            case SystemMemoryType:
+                type = SYSTEM_MEMORY;
+                break;
+            default:
+                type = RESERVED_MEMORY;
+        }
+        
+        ranges[i].type = type;
+        ranges[i].base = base;
+        ranges[i].size = size;
+    }
+    
+    memory_init(ranges, entries);
+}
+
+noreturn void kernel_entry(struct efi_boot_data *data)
+{
+    (void)data;
+    cpu_init();
+    serial_init();
+    kputs("<hacker voice> i'm in\r\n");
+    efi_memory_init(data->memory_map);
+    halt();
+}