4 files changed, 68 insertions, 0 deletions
diff --git a/common/constants/memory/flags.zig b/common/constants/memory/flags.zig
new file mode 100644
index 0000000..a057cf9
--- /dev/null
+++ b/common/constants/memory/flags.zig
@@ -0,0 +1,25 @@
+//! Memory Flag Constants
+
+pub const protection_read: u8 = 0x01;
+pub const protection_write: u8 = 0x02;
+pub const protection_execute: u8 = 0x04;
+pub const protection_user: u8 = 0x08;
+
+pub const protection_kernel_read_only: u8 = protection_read;
+pub const protection_kernel_read_write: u8 = protection_read | protection_write;
+pub const protection_kernel_execute: u8 = protection_read | protection_execute;
+pub const protection_user_read_only: u8 = protection_read | protection_user;
+pub const protection_user_read_write: u8 = protection_read | protection_write | protection_user;
+pub const protection_user_execute: u8 = protection_read | protection_execute | protection_user;
+
+pub const allocation_wired: u32 = 0x00000001;
+pub const allocation_contiguous: u32 = 0x00000002;
+pub const allocation_zero_fill: u32 = 0x00000004;
+pub const allocation_no_cache: u32 = 0x00000008;
+pub const allocation_write_combine: u32 = 0x00000010;
+
+pub const region_anonymous: u32 = 0x00000001;
+pub const region_shared: u32 = 0x00000002;
+pub const region_copy_on_write: u32 = 0x00000004;
+pub const region_stack: u32 = 0x00000008;
+pub const region_guard: u32 = 0x00000010;
diff --git a/common/constants/memory/layout.zig b/common/constants/memory/layout.zig
new file mode 100644
index 0000000..0e3780f
--- /dev/null
+++ b/common/constants/memory/layout.zig
@@ -0,0 +1,17 @@
+//! Memory Layout Constants
+
+pub const kernel_base: u64 = 0xFFFFFE0000000000;
+pub const kernel_text: u64 = 0xFFFFFE0001000000;
+pub const kernel_heap: u64 = 0xFFFFFE1000000000;
+pub const physmap_base: u64 = 0xFFFFFF0000000000;
+pub const mmio_base: u64 = 0xFFFFFF8000000000;
+
+pub const kernel_physical_base: u64 = 0x100000;
+
+pub const user_space_start: u64 = 0x0000000000000000;
+pub const user_space_end: u64 = 0x00007FFFFFFFFFFF;
+
+pub const kernel_stack_size: u64 = 64 * 1024;
+pub const kernel_stack_pages: u64 = kernel_stack_size / 4096;
+
+pub const physmap_max_size: u64 = 512 * 1024 * 1024 * 1024;
diff --git a/common/constants/memory/memory.zig b/common/constants/memory/memory.zig
new file mode 100644
index 0000000..9d82b78
--- /dev/null
+++ b/common/constants/memory/memory.zig
@@ -0,0 +1,5 @@
+//! Memory Constants
+
+pub const layout = @import("layout.zig");
+pub const sizes = @import("sizes.zig");
+pub const flags = @import("flags.zig");
diff --git a/common/constants/memory/sizes.zig b/common/constants/memory/sizes.zig
new file mode 100644
index 0000000..049b087
--- /dev/null
+++ b/common/constants/memory/sizes.zig
@@ -0,0 +1,21 @@
+//! Memory Size Constants
+
+pub const page_size: u64 = 4096;
+pub const page_shift: u6 = 12;
+pub const page_mask: u64 = page_size - 1;
+
+pub const large_page_size: u64 = 2 * 1024 * 1024;
+pub const large_page_shift: u6 = 21;
+pub const large_page_mask: u64 = large_page_size - 1;
+
+pub const huge_page_size: u64 = 1024 * 1024 * 1024;
+pub const huge_page_shift: u6 = 30;
+pub const huge_page_mask: u64 = huge_page_size - 1;
+
+pub const kilobyte: u64 = 1024;
+pub const megabyte: u64 = 1024 * kilobyte;
+pub const gigabyte: u64 = 1024 * megabyte;
+pub const terabyte: u64 = 1024 * gigabyte;
+
+pub const entries_per_page_table: u64 = 512;
+pub const page_table_levels: u8 = 4;