Bunch of stuff moved as .old for new arch change

1 files changed, 53 insertions, 0 deletions

diff --git a/mirai.old/kata/shift.zig b/mirai.old/kata/shift.zig
new file mode 100644
index 0000000..52e87fb
--- /dev/null
+++ b/mirai.old/kata/shift.zig
@@ -0,0 +1,53 @@
+//! Context shifting
+
+const context = @import("../asm/context.zig");
+const gdt = @import("../boot/gdt/gdt.zig");
+const paging = @import("../memory/paging.zig");
+const serial = @import("../drivers/serial/serial.zig");
+const tss = @import("../boot/tss/tss.zig");
+const types = @import("types.zig");
+
+var current_context: ?*types.Context = null;
+
+pub fn to_kata(kata: *types.Kata) void {
+    // Validate that the target RIP is mapped in the page table
+    if (paging.virt_to_phys(kata.page_table, kata.context.rip) == null) {
+        serial.printf("shift: FATAL - kata {d} rip {x} not mapped!\n", .{ kata.id, kata.context.rip });
+        paging.dump_pt_structure(kata.page_table, "corrupted");
+        while (true) {}
+    }
+
+    tss.set_kernel_stack(kata.stack_top);
+    current_context = &kata.context;
+
+    context.switch_to_context(
+        &kata.context,
+        kata.page_table,
+        kata.stack_top,
+    );
+}
+
+pub fn save_current(int_ctx: *const types.InterruptContext) void {
+    if (current_context) |ctx| {
+        ctx.rax = int_ctx.rax;
+        ctx.rbx = int_ctx.rbx;
+        ctx.rcx = int_ctx.rcx;
+        ctx.rdx = int_ctx.rdx;
+        ctx.rsi = int_ctx.rsi;
+        ctx.rdi = int_ctx.rdi;
+        ctx.rbp = int_ctx.rbp;
+        ctx.rsp = int_ctx.rsp;
+        ctx.r8 = int_ctx.r8;
+        ctx.r9 = int_ctx.r9;
+        ctx.r10 = int_ctx.r10;
+        ctx.r11 = int_ctx.r11;
+        ctx.r12 = int_ctx.r12;
+        ctx.r13 = int_ctx.r13;
+        ctx.r14 = int_ctx.r14;
+        ctx.r15 = int_ctx.r15;
+        ctx.rip = int_ctx.rip;
+        ctx.rflags = int_ctx.rflags;
+        ctx.cs = int_ctx.cs;
+        ctx.ss = int_ctx.ss;
+    }
+}