/* gdt_init - initialize the default GDT and TSS */
static void gdt_init(void)
{
// set boot kernel stack and default SS0
load_rsp0((uintptr_t) bootstacktop);
ts.ts_ss0 = KERNEL_DS;
// initialize the TSS filed of the gdt
gdt[SEG_TSS] =
SEGTSS(STS_T32A, (uintptr_t) & ts, sizeof(ts), DPL_KERNEL);
// reload all segment registers
lgdt(&gdt_pd);
// load the TSS
ltr(GD_TSS);
}
// proc_run - make process "proc" running on cpu
// NOTE: before call switch_to, should load base addr of "proc"'s new PDT
void
proc_run(struct proc_struct *proc) {
if (proc != current) {
bool intr_flag;
struct proc_struct *prev = current, *next = proc;
// kprintf("(%d) => %d\n", lapic_id, next->pid);
local_intr_save(intr_flag);
{
pls_write(current, proc);
load_rsp0(next->kstack + KSTACKSIZE);
mp_set_mm_pagetable(next->mm);
switch_to(&(prev->context), &(next->context));
}
local_intr_restore(intr_flag);
}
}
// proc_run - make process "proc" running on cpu
// NOTE: before call switch_to, should load base addr of "proc"'s new PDT
void proc_run(struct proc_struct *proc)
{
if (proc != current) {
bool intr_flag;
struct proc_struct *prev = current, *next = proc;
// kprintf("(%d) => %d\n", lapic_id, next->pid);
local_intr_save(intr_flag);
{
current = proc;
load_rsp0(next->kstack + KSTACKSIZE);
mp_set_mm_pagetable(next->mm);
#ifdef UCONFIG_BIONIC_LIBC
// for tls switch
tls_switch(next);
#endif //UCONFIG_BIONIC_LIBC
switch_to(&(prev->context), &(next->context));
}
local_intr_restore(intr_flag);
}
}
