static void fix_processor_context(void)
{
int cpu = smp_processor_id();
struct tss_struct *t = &per_cpu(init_tss, cpu);
set_tss_desc(cpu, t); /*
* This just modifies memory; should not be
* necessary. But... This is necessary, because
* 386 hardware has concept of busy TSS or some
* similar stupidity.
*/
load_TR_desc(); /* This does ltr */
load_LDT(¤t->active_mm->context); /* This does lldt */
/*
* Now maybe reload the debug registers
*/
if (current->thread.debugreg7) {
set_debugreg(current->thread.debugreg0, 0);
set_debugreg(current->thread.debugreg1, 1);
set_debugreg(current->thread.debugreg2, 2);
set_debugreg(current->thread.debugreg3, 3);
/* no 4 and 5 */
set_debugreg(current->thread.debugreg6, 6);
set_debugreg(current->thread.debugreg7, 7);
}
}
__init void km_arch_trim()
{
unsigned long i;
unsigned long *p = hal_x86_get_init_pgtable();
/*
Kernel part in 4mb page;
1,低端。
2,高端
*/
for(i = 0; i < HAL_GET_BASIC_KADDRESS(0) / 0x400000; i++)
p[i] = 0; //Mask as invalid;
for(i = (HAL_GET_BASIC_KADDRESS(0) + CONFIG_HAL_KERNEL_MEM_LEN) / 0x400000; i < 1024; i++)
p[i] = 0; //Mask as invalid;
write_cr3((unsigned long)hal_x86_get_init_pgtable() - HAL_GET_BASIC_KADDRESS(0));
/*
load tr
*/
set_tss_desc(0, &init_tss);
load_TR_desc();
/*
打开WP功能
*/
do {
unsigned long i = read_cr0();
//if(open)
i |= 1 << 16;
//else
// i &= ~(1 << 16);
write_cr0(i);
} while (0);
}