nuclear@42: #include "proc.h"
nuclear@42: #include "tss.h"
nuclear@45: #include "vm.h"
nuclear@42: 
nuclear@42: static struct process proc[MAX_PROC];
nuclear@42: static int cur_pid;
nuclear@42: 
nuclear@42: void init_proc(void)
nuclear@42: {
nuclear@45: 	int proc_size_pg, img_start_pg;
nuclear@45: 	void *img_start;
nuclear@42: 	cur_pid = -1;
nuclear@42: 
nuclear@42: 	/* prepare the first process */
nuclear@42: 
nuclear@42: 	/* allocate a chunk of memory for the process image
nuclear@42: 	 * and copy the code of test_proc there.
nuclear@42: 	 * (should be mapped at a fixed address)
nuclear@42: 	 */
nuclear@45: 	proc_size_pg = (test_proc_end - test_proc) / PGSIZE + 1;
nuclear@45: 	if((img_start_pg = pgalloc(proc_size_pg, MEM_USER)) == -1) {
nuclear@45: 		panic("failed to allocate space for the init process image\n");
nuclear@45: 	}
nuclear@45: 	img_start = (void*)PAGE_TO_ADDR(img_start_pg);
nuclear@45: 	memcpy(img_start, test_proc, proc_size_pg * PGSIZE);
nuclear@45: 
nuclear@45: 	/* create the virtual address space for this process */
nuclear@45: 	proc[0].ctx.pgtbl_paddr = clone_vmem();
nuclear@45: 
nuclear@45: 	/* we don't need the image in this address space */
nuclear@45: 	unmap_pa
nuclear@45: 	pgfree(img_start_pg, proc_size_pg);
nuclear@45: 
nuclear@42: 
nuclear@42: 	/* fill in the proc[0].ctx with the appropriate process stack
nuclear@42: 	 * and instruction pointers
nuclear@42: 	 */
nuclear@42: 
nuclear@42: 	/* switch to it by calling a function that takes the context
nuclear@42: 	 * of the current process, plugs the values into the interrupt
nuclear@42: 	 * stack, and calls iret.
nuclear@42: 	 * (should also set ss0/sp0 in TSS before returning)
nuclear@42: 	 */
nuclear@42: }
nuclear@42: 
nuclear@43: /*
nuclear@42: void save_context(struct intr_frame *ifrm)
nuclear@42: {
nuclear@42: 	proc[cur_pid].ctx->regs = ifrm->regs;
nuclear@42: 	proc[cur_pid].ctx->instr_ptr = ifrm->eip;
nuclear@42: 	proc[cur_pid].ctx->stack_ptr = ifrm->esp;
nuclear@42: 	proc[cur_pid].ctx->flags = ifrm->eflags;
nuclear@43: }*/