From edc42358664e9d70227e274273321ab032394a7e Mon Sep 17 00:00:00 2001
From: Ada Christine <adachristine18@gmail.com>
Date: Wed, 20 May 2026 23:04:06 +0000
Subject: new thread code works fine

---
 kc/core/arch_thread.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 kc/core/arch_thread.c

(limited to 'kc/core/arch_thread.c')

diff --git a/kc/core/arch_thread.c b/kc/core/arch_thread.c
new file mode 100644
index 0000000..8f5f8d3
--- /dev/null
+++ b/kc/core/arch_thread.c
@@ -0,0 +1,84 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <stdnoreturn.h>
+#include "task.h"
+#include <lib/kstdio.h>
+
+struct arch_register_context
+{
+	uint64_t
+		r15,
+		r14,
+		r13,
+		r12,
+		r11,
+		r10,
+		r9,
+		r8,
+		rsi,
+		rdi,
+		rdx,
+		rcx,
+		rbx,
+		rax,
+		rbp,
+		rsp;
+};
+
+extern uint64_t *get_tss_rsp0(void);
+
+struct arch_thread_context
+{
+	struct arch_register_context register_context;
+	void *return_address;
+};
+
+extern void arch_swap_thread_stack(
+		void * volatile *outgoing_stack,
+		void *incoming_stack);
+
+extern void arch_begin_thread(
+		void *(func)(void *),
+		void *params);
+
+void arch_create_thread(
+		struct kc_thread *thread,
+		void *(*func)(void *),
+		void *params)
+{
+	uintptr_t stack_pointer = (uintptr_t)thread->kernel_stack_pointer;
+	struct arch_thread_context *context = (struct arch_thread_context *)
+		(stack_pointer -= sizeof(*context));
+	thread->kernel_stack_pointer = (void *)stack_pointer;
+
+	context->return_address = (void *)arch_begin_thread;
+	context->register_context.rdi = (uint64_t)func;
+	context->register_context.rsi = (uint64_t)params;
+	context->register_context.rdx = (uint64_t)thread;
+	context->register_context.rsp = (uint64_t)&context->return_address;
+}
+
+void arch_swap_thread(
+		struct kc_thread *outgoing,
+		struct kc_thread *incoming)
+{
+	kprintf("swapping thread...\n");
+	kprintf("stack pointer %p\n", incoming->kernel_stack_pointer);
+	arch_swap_thread_stack(&outgoing->kernel_stack_pointer, incoming->kernel_stack_pointer);
+}
+
+void *arch_idle_loop(void *)
+{
+	for (;;) __asm__ ("hlt");
+	return nullptr;
+}
+
+noreturn void arch_terminate_thread(void *result, struct kc_thread *thread)
+{
+	thread->result = (union kc_thread_result){ .pointer = result };
+	thread->status = TERMINATED;
+	thread->kernel_stack_pointer = thread->kernel_stack_head;
+	task_schedule();
+	for (;;) __asm__ ("hlt");
+}
+
-- 
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