Initial Upload

entryother.asm

@@ -0,0 +1,115 @@
+
+bootblockother.o:     file format elf32-i386
+
+
+Disassembly of section .text:
+
+00007000 <start>:
+# This code combines elements of bootasm.S and entry.S.
+
+.code16           
+.globl start
+start:
+    cli            
+    7000:	fa                   	cli    
+
+    # Zero data segment registers DS, ES, and SS.
+    xorw    %ax,%ax
+    7001:	31 c0                	xor    %eax,%eax
+    movw    %ax,%ds
+    7003:	8e d8                	mov    %eax,%ds
+    movw    %ax,%es
+    7005:	8e c0                	mov    %eax,%es
+    movw    %ax,%ss
+    7007:	8e d0                	mov    %eax,%ss
+
+    # Switch from real to protected mode.  Use a bootstrap GDT that makes
+    # virtual addresses map directly to physical addresses so that the
+    # effective memory map doesn't change during the transition.
+    lgdt    gdtdesc
+    7009:	0f 01 16             	lgdtl  (%esi)
+    700c:	74 70                	je     707e <_end+0x2>
+    movl    %cr0, %eax
+    700e:	0f 20 c0             	mov    %cr0,%eax
+    orl     $CR0_PE, %eax
+    7011:	66 83 c8 01          	or     $0x1,%ax
+    movl    %eax, %cr0
+    7015:	0f 22 c0             	mov    %eax,%cr0
+
+    # Complete the transition to 32-bit protected mode by using a long jmp
+    # to reload %cs and %eip.  The segment descriptors are set up with no
+    # translation, so that the mapping is still the identity mapping.
+    ljmpl    $(SEG_KCODE<<3), $(start32)
+    7018:	66 ea 20 70 00 00    	ljmpw  $0x0,$0x7020
+    701e:	08 00                	or     %al,(%eax)
+
+00007020 <start32>:
+
+
+.code32  # Tell assembler to generate 32-bit code now.
+start32:
+    # Set up the protected-mode data segment registers
+    movw    $(SEG_KDATA<<3), %ax    # Our data segment selector
+    7020:	66 b8 10 00          	mov    $0x10,%ax
+    movw    %ax, %ds                # -> DS: Data Segment
+    7024:	8e d8                	mov    %eax,%ds
+    movw    %ax, %es                # -> ES: Extra Segment
+    7026:	8e c0                	mov    %eax,%es
+    movw    %ax, %ss                # -> SS: Stack Segment
+    7028:	8e d0                	mov    %eax,%ss
+    movw    $0, %ax                 # Zero segments not ready for use
+    702a:	66 b8 00 00          	mov    $0x0,%ax
+    movw    %ax, %fs                # -> FS
+    702e:	8e e0                	mov    %eax,%fs
+    movw    %ax, %gs                # -> GS
+    7030:	8e e8                	mov    %eax,%gs
+
+    # Turn on page size extension for 4Mbyte pages
+    movl    %cr4, %eax
+    7032:	0f 20 e0             	mov    %cr4,%eax
+    orl     $(CR4_PSE), %eax
+    7035:	83 c8 10             	or     $0x10,%eax
+    movl    %eax, %cr4
+    7038:	0f 22 e0             	mov    %eax,%cr4
+    # Use entrypgdir as our initial page table
+    movl    (start-12), %eax
+    703b:	a1 f4 6f 00 00       	mov    0x6ff4,%eax
+    movl    %eax, %cr3
+    7040:	0f 22 d8             	mov    %eax,%cr3
+    # Turn on paging.
+    movl    %cr0, %eax
+    7043:	0f 20 c0             	mov    %cr0,%eax
+    orl     $(CR0_PE|CR0_PG|CR0_WP), %eax
+    7046:	0d 01 00 01 80       	or     $0x80010001,%eax
+    movl    %eax, %cr0
+    704b:	0f 22 c0             	mov    %eax,%cr0
+
+    # Switch to the stack allocated by startothers()
+    movl    (start-4), %esp
+    704e:	8b 25 fc 6f 00 00    	mov    0x6ffc,%esp
+    # Call mpenter()
+    call	 *(start-8)
+    7054:	ff 15 f8 6f 00 00    	call   *0x6ff8
+
+0000705a <spin>:
+
+    # We should never return.
+spin:
+    jmp     spin
+    705a:	eb fe                	jmp    705a <spin>
+
+0000705c <gdt>:
+	...
+    7064:	ff                   	(bad)  
+    7065:	ff 00                	incl   (%eax)
+    7067:	00 00                	add    %al,(%eax)
+    7069:	9a cf 00 ff ff 00 00 	lcall  $0x0,$0xffff00cf
+    7070:	00                   	.byte 0x0
+    7071:	92                   	xchg   %eax,%edx
+    7072:	cf                   	iret   
+	...
+
+00007074 <gdtdesc>:
+    7074:	17                   	pop    %ss
+    7075:	00 5c 70 00          	add    %bl,0x0(%eax,%esi,2)
+	...