entering the idle task appears to work

1 files changed, 38 insertions, 0 deletions

diff --git a/kc/core/task.c b/kc/core/task.c
index 8f78516..b825f01 100644
--- a/kc/core/task.c
+++ b/kc/core/task.c
@@ -2,6 +2,7 @@
 #include "memory.h"
 #include "panic.h"
 #include "cpu.h"
+#include "kprint.h"
 
 struct kc_thread *current_task = NULL;
 struct kc_thread *first_ready_task = NULL;
@@ -72,5 +73,42 @@ static void set_thread_status(enum kc_thread_status status)
 
 static void idle_task_thread(void)
 {
+    kputs("in idle thread\n");
+    while (1)
+    {
+        __asm__ volatile ("hlt;");
+    }
+    kputs("scheduling\n");
+    lock_scheduler();
+    task_schedule();
+    unlock_scheduler();
+}
+
+noreturn void task_init(void)
+{
+    char *kernel_rsp0 = vm_alloc(4096);
+    // TODO: make it so this isn't demand-allocated.
+    kernel_rsp0[1] = 0;
+    *get_tss_rsp0() = (uintptr_t)kernel_rsp0;
+    char *first_task = vm_alloc(16384);
+    struct kc_thread *idle_thread =
+        (struct kc_thread *)(first_task + 16384 - sizeof(*idle_thread));
+    idle_thread->state.stack = (uintptr_t)idle_thread;
+    idle_thread->state.stack_top = (uintptr_t)kernel_rsp0;
+    
+    __asm__ volatile
+        (
+         "mov %%cr3, %%rax\n\t"
+         "mov %%rax, 0(%%rsi)\n\t"
+         "mov %%rcx, %%rsp\n\t"
+         "jmp idle_task_thread\n\t"
+         : "=m"(idle_thread->state.page_map)
+         : "S"(&idle_thread->state.page_map),
+         "c"(idle_thread)
+         : "rax"
+        );
+
+    // shouldn't ever get here
+    panic(GENERAL_PANIC);
 }