Add a physical memory manager

test/mock/kernel/arch_mock.zig

@@ -5,6 +5,7 @@ const MemProfile = mem.MemProfile;
 const gdt = @import("gdt_mock.zig");
 const idt = @import("idt_mock.zig");
 const multiboot = @import("../../../src/kernel/multiboot.zig");
+const paging = @import("paging_mock.zig");
 
 const mock_framework = @import("mock_framework.zig");
 pub const initTest = mock_framework.initTest;
@@ -35,6 +36,8 @@ pub const InterruptContext = struct {
     ss: u32,
 };
 
+pub const MEMORY_BLOCK_SIZE = paging.PAGE_SIZE_4KB;
+
 pub fn outb(port: u16, data: u8) void {
     return mock_framework.performAction("outb", void, .{ port, data });
 }

test/mock/kernel/mem_mock.zig

@@ -7,6 +7,7 @@ pub const MemProfile = struct {
     physaddr_start: [*]u8,
     mem_kb: u32,
     fixed_alloc_size: u32,
+    mem_map: []multiboot.multiboot_memory_map_t,
 };
 
 // The virtual/physical start/end of the kernel code
@@ -28,5 +29,6 @@ pub fn init(mb_info: *multiboot.multiboot_info_t) MemProfile {
         // Total memory available including the initial 1MiB that grub doesn't include
         .mem_kb = mb_info.mem_upper + mb_info.mem_lower + 1024,
         .fixed_alloc_size = FIXED_ALLOC_SIZE,
+        .mem_map = undefined,
     };
 }

test/mock/kernel/paging_mock.zig

@@ -0,0 +1 @@
+pub const PAGE_SIZE_4KB = 4096;