Kernel/Bootloader: banan-os can now be booted with my bootloader :D

bootloader/boot.S

@@ -108,7 +108,16 @@ protected_mode:
 	movw %bx, %fs
 	movw %bx, %gs
 	movw %bx, %ss
-	jmp *%eax
+
+	movl %eax, %ecx
+
+	movl $0xD3C60CFF, %eax
+	movl $banan_boot_info, %ebx
+	xorl %edx, %edx
+	xorl %esi, %esi
+	xorl %edi, %edi
+
+	jmp *%ecx
 
 
 .code16
@@ -154,3 +163,9 @@ gdt:
 gdtr:
 	.short . - gdt - 1
 	.quad gdt
+
+banan_boot_info:
+	boot_command_line:
+		.long command_line
+	boot_memory_map:
+		.long memory_map

bootloader/command_line.S

@@ -68,6 +68,8 @@ command_line_enter_msg:
 
 .section .bss
 
+.global command_line
+command_line:
 # 100 character command line
 command_line_buffer:
 	.skip 100

bootloader/memory_map.S

@@ -122,6 +122,8 @@ memory_map_error_msg:
 
 .section .bss
 
+.global memory_map
+memory_map:
 memory_map_entry_count:
 	.skip 4
 # 100 entries should be enough...

kernel/include/kernel/BananBootloader.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stdint.h>
+
+#define BANAN_BOOTLOADER_MAGIC 0xD3C60CFF
+
+struct BananBootloaderMemoryMapEntry
+{
+	uint64_t address;
+	uint64_t length;
+	uint32_t type;
+} __attribute__((packed));
+
+struct BananBootloaderMemoryMapInfo
+{
+	uint32_t						entry_count;
+	BananBootloaderMemoryMapEntry	entries[];
+} __attribute__((packed));
+
+struct BananBootloaderInfo
+{
+	uint32_t command_line_addr;
+	uint32_t memory_map_addr;
+} __attribute__((packed));

kernel/kernel/BootInfo.cpp

@@ -1,5 +1,5 @@
 #include <kernel/BootInfo.h>
-
+#include <kernel/BananBootloader.h>
 #include <kernel/multiboot2.h>
 
 namespace Kernel
@@ -64,10 +64,36 @@ namespace Kernel
 		return {};
 	}
 
+	void parse_boot_info_banan_bootloader(uint32_t info)
+	{
+		const auto& banan_bootloader_info = *reinterpret_cast<const BananBootloaderInfo*>(info);
+
+		const char* command_line = reinterpret_cast<const char*>(banan_bootloader_info.command_line_addr);
+		MUST(g_boot_info.command_line.append(command_line));
+
+		const auto& memory_map =  *reinterpret_cast<BananBootloaderMemoryMapInfo*>(banan_bootloader_info.memory_map_addr);
+		MUST(g_boot_info.memory_map_entries.resize(memory_map.entry_count));
+		for (size_t i = 0; i < memory_map.entry_count; i++)
+		{
+			const auto& mmap_entry = memory_map.entries[i];
+			g_boot_info.memory_map_entries[i].address	= mmap_entry.address;
+			g_boot_info.memory_map_entries[i].length	= mmap_entry.length;
+			g_boot_info.memory_map_entries[i].type		= mmap_entry.type;
+		}
+	}
+
+	BAN::StringView get_early_boot_command_line_banan_bootloader(uint32_t info)
+	{
+		const auto& banan_bootloader_info = *reinterpret_cast<const BananBootloaderInfo*>(info);
+		return reinterpret_cast<const char*>(banan_bootloader_info.command_line_addr);
+	}
+
 	bool validate_boot_magic(uint32_t magic)
 	{
 		if (magic == MULTIBOOT2_MAGIC)
 			return true;
+		if (magic == BANAN_BOOTLOADER_MAGIC)
+			return true;
 		return false;	
 	}
 
@@ -77,6 +103,8 @@ namespace Kernel
 		{
 			case MULTIBOOT2_MAGIC:
 				return parse_boot_info_multiboot2(info);
+			case BANAN_BOOTLOADER_MAGIC:
+				return parse_boot_info_banan_bootloader(info);
 		}
 		ASSERT_NOT_REACHED();
 	}
@@ -87,6 +115,8 @@ namespace Kernel
 		{
 			case MULTIBOOT2_MAGIC:
 				return get_early_boot_command_line_multiboot2(info);
+			case BANAN_BOOTLOADER_MAGIC:
+				return get_early_boot_command_line_banan_bootloader(info);
 		}
 		ASSERT_NOT_REACHED();
 	}