Changeset f66c203d in mainline for kernel/arch/amd64/src/boot/multiboot.S

Timestamp:

2012-07-24T16:55:15Z (12 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8f4f444

Parents:

c828803

Message:

explicitly load default BIOS IDT for real-mode VESA BIOS access (GRUB 2.00 setups an empty IDT for bootstrap)
always use an empty IDT during bootstrap (for consistency)
make sure the interrupts are disabled during bootstrap
make sure correct GDT is set after returning from VESA BIOS

File:

• kernel/arch/amd64/src/boot/multiboot.S (modified) (3 diffs)

kernel/arch/amd64/src/boot/multiboot.S

@@ -76 +76 @@
 
 multiboot_image_start:
+        cli
         cld
         
@@ -81 +82 @@
         movl $START_STACK, %esp
         
-        /* Initialize Global Descriptor Table register */
+        /*
+         * Initialize Global Descriptor Table and
+         * Interrupt Descriptor Table registers
+         */
         lgdtl bootstrap_gdtr
+        lidtl bootstrap_idtr
         
         /* Kernel data + stack */
@@ -645 +650 @@
 .section K_DATA_START, "aw", @progbits
 
+.global bootstrap_idtr
+bootstrap_idtr:
+        .word 0
+        .long 0
+
 .global bootstrap_gdtr
 bootstrap_gdtr: