Changeset b52da8d7 in mainline for arch/ia32/src/boot/boot.S

Timestamp:

2005-08-29T11:57:26Z (20 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

c245372b

Parents:

229d5fc1

Message:

Add some comments to IA-32 src/boot/boot.S and src/smp.S.

Make the boot stack start on page boundary.
This is required by get_stack_base().

Define 'THE' macro.

Implement preemption_disable() and preemption_enable().

Add memory barrier macros.
IA-32 macros need support for older processors.
Non IA-32 macros are dummy.

Reduction of many #include paths.

File:

• arch/ia32/src/boot/boot.S (modified) (3 diffs)

arch/ia32/src/boot/boot.S

@@ -48 +48 @@
         call memmap_arch_init
         
-        lgdt gdtr
+        lgdt gdtr                       # initialize Global Descriptor Table register
+        lidt idtr                       # initialize Interrupt Descriptor Table register
+        
         movl %cr0,%eax
         orl $0x1,%eax
-        movl %eax,%cr0
+        movl %eax,%cr0                  # switch to protected mode
         jmpl $8,$meeting_point
 meeting_point:
@@ -63 +65 @@
         movw %ax,%ss
 
-        lidt idtr
-
-        call map_kernel
+        call map_kernel                 # map kernel and turn paging on
 
         movl $_hardcoded_ktext_size, hardcoded_ktext_size
@@ -95 +95 @@
         movl %eax, %cr3
         
-        # turn on paging
+        # turn paging on
         movl %cr0, %ebx
         orl $(1<<31), %ebx