| 1,6 → 1,5 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * Copyright (C) 2005-2006 Ondrej Palkovsky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| 168,8 → 167,15 |
|---|
| d->present = 1; |
| d->type = AR_INTERRUPT; /* masking interrupt */ |
| |
| if (i == VECTOR_SYSCALL) { |
| /* |
| * The syscall interrupt gate must be calleable from userland. |
| */ |
| d->dpl |= PL_USER; |
| } |
| |
| idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size); |
| exc_register(i, "undef", (iroutine)null_interrupt); |
| exc_register(i, "undef", null_interrupt); |
| } |
| exc_register(13, "gp_fault", gp_fault); |
| exc_register( 7, "nm_fault", nm_fault); |
| 176,9 → 182,37 |
|---|
| exc_register(12, "ss_fault", ss_fault); |
| } |
| |
| /** Initialize segmentation - code/data/idt tables |
| * |
| */ |
| |
| /* Clean IOPL(12,13) and NT(14) flags in EFLAGS register */ |
| static void clean_IOPL_NT_flags(void) |
| { |
| asm |
| ( |
| "pushfq;" |
| "pop %%rax;" |
| "and $~(0x7000),%%rax;" |
| "pushq %%rax;" |
| "popfq;" |
| : |
| : |
| :"%rax" |
| ); |
| } |
| |
| /* Clean AM(18) flag in CR0 register */ |
| static void clean_AM_flag(void) |
| { |
| asm |
| ( |
| "mov %%cr0,%%rax;" |
| "and $~(0x40000),%%rax;" |
| "mov %%rax,%%cr0;" |
| : |
| : |
| :"%rax" |
| ); |
| } |
| |
| void pm_init(void) |
| { |
| struct descriptor *gdt_p = (struct descriptor *) gdtr.base; |
| 220,4 → 254,7 |
|---|
| * to its own TSS. We just need to load the TR register. |
| */ |
| __asm__("ltr %0" : : "r" ((__u16) gdtselector(TSS_DES))); |
| |
| clean_IOPL_NT_flags(); /* Disable I/O on nonprivileged levels */ |
| clean_AM_flag(); /* Disable alignment check */ |
| } |