proc.c

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#include <core/system.h>
#include <core/string.h>
#include <core/panic.h>
#include <core/arch.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <sys/signal.h>
#include <ds/queue.h>
#include <mm/pmap.h>
 
/*
 * Sets up the x86 state of init's thread, at boot: a kernel stack, and a
 * start at the program's entry point in user mode. Panics if there's no
 * memory: the kernel can't go on without init.
 */
void arch_proc_init(struct proc *proc)
{
    struct x86_thread *arch = kmalloc(sizeof(struct x86_thread), &M_X86_THREAD, M_ZERO);
    uintptr_t kstack_base = arch ? (uintptr_t) kmalloc(KERN_STACK_SIZE, &M_KERN_STACK, 0) : 0;
 
    if (!kstack_base)
        panic("no memory for init's thread");
 
    arch->kstack_base = kstack_base;
    arch->kstack = kstack_base + KERN_STACK_SIZE;   /* its top */
#if ARCH_BITS==32
    arch->eip    = proc->entry;
    arch->esp    = USER_STACK;
    arch->eflags = X86_EFLAGS;
#else
    arch->rip    = proc->entry;
    arch->rsp    = USER_STACK;
    arch->rflags = X86_EFLAGS;
#endif
 
    struct thread *thread = (struct thread *) proc->threads.head->value;
    thread->arch = arch;
}