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//! 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;
}
}
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