Add explicit sizes to all instructions. Use movl for segment register moves
to avoid unnecessary size overrides. Simplify halt sequences.
This commit is contained in:
mycroft
parent
e30d1e5df6
commit
1f71230441
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@ -54,10 +54,9 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#include "asm.h"
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CR0_PE_ON = 0x1
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CR0_PE_OFF = 0xfffffffe
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CR0_PE = 0x1
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.globl _ouraddr
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.globl EXT(ouraddr)
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.text
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/*
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@ -76,11 +75,11 @@ ENTRY(real_to_prot)
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lgdt EXT(Gdtr)
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# set the PE bit of CR0
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mov %cr0, %eax
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movl %cr0, %eax
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data32
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or $CR0_PE_ON, %eax
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mov %eax, %cr0
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orl $CR0_PE, %eax
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movl %eax, %cr0
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# make intrasegment jump to flush the processor pipeline and
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# reload CS register
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@ -90,10 +89,10 @@ ENTRY(real_to_prot)
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xprot:
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# we are in USE32 mode now
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# set up the protected mode segment registers : DS, SS, ES
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mov $0x20, %eax
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movw %ax, %ds
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movw %ax, %ss
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movw %ax, %es
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movl $0x20, %eax
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movl %ax, %ds
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movl %ax, %ss
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movl %ax, %es
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# load idtr so we can debug
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lidt EXT(Idtr_prot)
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@ -113,7 +112,7 @@ ENTRY(prot_to_real)
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movl _ouraddr, %eax
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sarl $4, %eax
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pushw %ax
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movw $xreal, %ax # gas botches pushw $xreal - extra bytes 0, 0
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movl $xreal, %eax # gas botches pushw $xreal - extra bytes 0, 0
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pushw %ax # decode to add %al, (%eax) (%al usually 0)
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# Change to use16 mode.
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@ -121,10 +120,10 @@ ENTRY(prot_to_real)
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x16:
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# clear the PE bit of CR0
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mov %cr0, %eax
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movl %cr0, %eax
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data32
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and $CR0_PE_OFF, %eax
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mov %eax, %cr0
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andl $~CR0_PE, %eax
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movl %eax, %cr0
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# make intersegment jmp to flush the processor pipeline
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# using the fake stack frame set up earlier
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@ -134,10 +133,10 @@ x16:
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xreal:
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# we are in real mode now
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# set up the real mode segment registers : DS, SS, ES
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movw %cs, %ax
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movw %ax, %ds
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movw %ax, %ss
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movw %ax, %es
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movl %cs, %ax
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movl %ax, %ds
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movl %ax, %ss
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movl %ax, %es
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# load idtr so we can debug
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addr32
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@ -155,15 +154,15 @@ xreal:
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*/
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ENTRY(startprog)
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push %ebp
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mov %esp, %ebp
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pushl %ebp
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movl %esp, %ebp
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# get things we need into registers
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movl 0x8(%ebp), %ecx # entry offset
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movl 0x0c(%ebp), %eax # &argv
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# make a new stack at 0:0xa0000 (big segs)
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mov $0x10, %ebx
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movl $0x10, %ebx
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movw %bx, %ss
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movl $0xa0000, %ebx
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movl %ebx, %esp
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@ -178,14 +177,14 @@ ENTRY(startprog)
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pushl $0 # dummy 'return' address
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# push on our entry address
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mov $0x08, %ebx # segment
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movl $0x08, %ebx # segment
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pushl %ebx
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pushl %ecx
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# convert over the other data segs
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mov $0x10, %ebx
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movw %bx, %ds
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movw %bx, %es
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movl $0x10, %ebx
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movl %bx, %ds
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movl %bx, %es
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# convert the PC (and code seg)
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lret
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@ -196,29 +195,29 @@ ENTRY(startprog)
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*/
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ENTRY(pbzero)
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push %ebp
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mov %esp, %ebp
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push %es
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push %edi
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push %ecx
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pushl %ebp
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movl %esp, %ebp
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pushl %es
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pushl %edi
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pushl %ecx
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cld
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# set %es to point at the flat segment
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mov $0x10, %eax
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movw %ax, %es
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movl $0x10, %eax
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movl %ax, %es
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mov 0x8(%ebp), %edi # destination
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mov 0xc(%ebp), %ecx # count
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mov $0x0, %eax # value
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movl 0x8(%ebp), %edi # destination
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movl 0xc(%ebp), %ecx # count
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movl $0x0, %eax # value
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rep
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stosb
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pop %ecx
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pop %edi
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pop %es
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pop %ebp
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popl %ecx
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popl %edi
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popl %es
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popl %ebp
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ret
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/*
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@ -229,31 +228,30 @@ ENTRY(pbzero)
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*/
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ENTRY(pcpy)
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push %ebp
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mov %esp, %ebp
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push %es
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push %esi
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push %edi
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push %ecx
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pushl %ebp
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movl %esp, %ebp
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pushl %es
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pushl %esi
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pushl %edi
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pushl %ecx
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cld
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# set %es to point at the flat segment
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mov $0x10, %eax
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movw %ax, %es
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movl $0x10, %eax
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movl %ax, %es
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mov 0x8(%ebp), %esi # source
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mov 0xc(%ebp), %edi # destination
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mov 0x10(%ebp), %ecx # count
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movl 0x8(%ebp), %esi # source
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movl 0xc(%ebp), %edi # destination
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movl 0x10(%ebp), %ecx # count
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rep
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movsb
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pop %ecx
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pop %edi
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pop %esi
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pop %es
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pop %ebp
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popl %ecx
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popl %edi
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popl %esi
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popl %es
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popl %ebp
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ret
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@ -70,13 +70,13 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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ENTRY(biosread)
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push %ebp
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mov %esp, %ebp
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pushl %ebp
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movl %esp, %ebp
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push %ebx
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push %ecx
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push %edx
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push %es
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pushl %ebx
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pushl %ecx
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pushl %edx
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pushl %es
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movb 0x10(%ebp), %dh
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movw 0x0c(%ebp), %cx
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@ -98,19 +98,19 @@ ENTRY(biosread)
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int $0x13
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cli
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mov %eax, %ebx # save return value (actually movw %ax, %bx)
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movl %eax, %ebx # save return value (actually movw %ax, %bx)
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data32
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call EXT(real_to_prot) # back to protected mode
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xor %eax, %eax
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xorl %eax, %eax
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movb %bh, %al # return value in %ax
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pop %es
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pop %edx
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pop %ecx
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pop %ebx
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pop %ebp
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popl %es
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popl %edx
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popl %ecx
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popl %ebx
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popl %ebp
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ret
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@ -126,17 +126,17 @@ ENTRY(biosread)
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ENTRY(putc)
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push %ebp
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mov %esp, %ebp
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push %ebx
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push %ecx
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx
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pushl %ecx
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movb 0x8(%ebp), %cl
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call EXT(prot_to_real)
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data32
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mov $0x1, %ebx # %bh=0, %bl=1 (blue)
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movl $0x1, %ebx # %bh=0, %bl=1 (blue)
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movb $0xe, %ah
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movb %cl, %al
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sti
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@ -146,9 +146,9 @@ ENTRY(putc)
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data32
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call EXT(real_to_prot)
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pop %ecx
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pop %ebx
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pop %ebp
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popl %ecx
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popl %ebx
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popl %ebp
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ret
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@ -161,9 +161,9 @@ ENTRY(putc)
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*/
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ENTRY(getc)
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push %ebp
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mov %esp, %ebp
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push %ebx # save %ebx
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx # save %ebx
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call EXT(prot_to_real)
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@ -177,11 +177,11 @@ ENTRY(getc)
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data32
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call EXT(real_to_prot)
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xor %eax, %eax
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xorl %eax, %eax
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movb %bl, %al
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pop %ebx
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pop %ebp
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popl %ebx
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popl %ebp
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ret
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/*
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# ischar()
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@ -197,13 +197,13 @@ ENTRY(getc)
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# Zero flag = set
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*/
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ENTRY(ischar)
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push %ebp
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mov %esp, %ebp
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push %ebx
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx
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call EXT(prot_to_real) # enter real mode
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xor %ebx, %ebx
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xorl %ebx, %ebx
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movb $0x1, %ah
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sti
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int $0x16
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@ -216,11 +216,11 @@ nochar:
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data32
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call EXT(real_to_prot)
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xor %eax, %eax
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xorl %eax, %eax
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movb %bl, %al
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pop %ebx
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pop %ebp
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popl %ebx
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popl %ebp
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ret
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/*
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@ -231,12 +231,12 @@ nochar:
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*/
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ENTRY(get_diskinfo)
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push %ebp
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mov %esp, %ebp
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push %es
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push %ebx
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push %ecx
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push %edx
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pushl %ebp
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movl %esp, %ebp
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pushl %es
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pushl %ebx
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pushl %ecx
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pushl %edx
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movb 0x8(%ebp), %dl # diskinfo(drive #)
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call EXT(prot_to_real) # enter real mode
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@ -274,11 +274,11 @@ ok:
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andb $0x3f, %cl # mask of cylinder gunk
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movb %cl, %al # max sector (and # sectors)
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pop %edx
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pop %ecx
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pop %ebx
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pop %es
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pop %ebp
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popl %edx
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popl %ecx
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popl %ebx
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popl %es
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popl %ebp
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ret
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/*
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@ -292,11 +292,11 @@ ok:
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*/
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ENTRY(memsize)
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push %ebp
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mov %esp, %ebp
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push %ebx
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx
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mov 8(%ebp), %ebx
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movl 8(%ebp), %ebx
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call EXT(prot_to_real) # enter real mode
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@ -316,12 +316,12 @@ xext: movb $0x88, %ah
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cli
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xdone:
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mov %eax, %ebx
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movl %eax, %ebx
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data32
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call EXT(real_to_prot)
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mov %ebx, %eax
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pop %ebx
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pop %ebp
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movl %ebx, %eax
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popl %ebx
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popl %ebp
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ret
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@ -32,10 +32,6 @@
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#define BOOT_CS_INDEX 3
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#define BOOT_CS16_INDEX 5
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#define BOOT_DS_INDEX 4
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#define DB_CS_INDEX 14
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#define DB_CS16_INDEX 15
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#define DB_DS_INDEX 16
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#define GDT_INDEX 17
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/* Vector numbers. */
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#define BREAKPOINT_VECTOR 3
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@ -50,9 +46,9 @@
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ENTRY(boot2)
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data32
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subl %eax, %eax
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mov %cs, %ax
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mov %ax, %ds
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mov %ax, %es
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movl %cs, %ax
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movl %ax, %ds
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movl %ax, %es
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data32
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shll $4, %eax
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addr32
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@ -67,7 +63,7 @@ ENTRY(boot2)
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movb %bl, EXT(Gdt)+(8*gdt_index)+4
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data32
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shld $16, %eax, %ebx
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shldl $16, %eax, %ebx
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FIXUP(BOOT_CS_INDEX)
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FIXUP(BOOT_CS16_INDEX)
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FIXUP(BOOT_DS_INDEX)
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@ -77,9 +73,6 @@ ENTRY(boot2)
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movl %eax, %ecx
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data32
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addl $ EXT(Gdt), %eax
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data32
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shld $16, %eax, %ebx
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FIXUP(GDT_INDEX)
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addr32
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data32
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movl %eax, EXT(Gdtr)+2
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@ -89,60 +82,6 @@ ENTRY(boot2)
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data32
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movl %ecx, EXT(Idtr_prot)+2
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/* %es = vector table segment for a while */
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push %es
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data32
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subl %eax, %eax
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mov %ax, %es
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#ifdef BDB
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/* fix up GDT entries for bdb */
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data32
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movl $4*DEBUG_VECTOR, %esi
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addr32
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movl %es: 2(%esi), %eax /* actually movw to %ax */
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data32
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shll $4, %eax
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data32
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shld $16, %eax, %ebx
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FIXUP(DB_CS_INDEX)
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FIXUP(DB_CS16_INDEX)
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FIXUP(DB_DS_INDEX)
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/* Fetch entry points of bdb's protected mode trap handlers. These
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* are stored at 2 before the corresponding entry points for real mode.
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*/
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data32
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subl %ebx, %ebx
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addr32
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movl %es: (%esi), %ebx /* actually movw to %bx */
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data32
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subl %ecx, %ecx
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addr32
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movl %es: 4*(BREAKPOINT_VECTOR-DEBUG_VECTOR)(%esi), %ecx
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/* actually movw to %cx */
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/* %es = bdb segment for a while */
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data32
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shrl $4, %eax
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mov %ax, %es
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/* XXX appears to be broken */
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/* fix up IDT entries for bdb */
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subl $2, %ebx
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movl %es:(%edi), %eax /* actually movw %es:(%bx), %ax */
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addr32
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movl %eax, EXT(Idt)+8*DEBUG_VECTOR /* actually movw %ax */
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movl %ecx, %ebx
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subl $2, %ebx
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movl %es:(%edi), %eax /* actually movw %es:(%bx), %ax */
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addr32
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movl %eax, EXT(Idt)+8*BREAKPOINT_VECTOR /* actually movw %ax */
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#endif
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/* finished with groping in real mode segments */
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pop %es
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/* change to protected mode */
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data32
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call EXT(real_to_prot)
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@ -159,8 +98,8 @@ ENTRY(boot2)
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|||
pushl %edx
|
||||
call EXT(boot)
|
||||
oops:
|
||||
cli
|
||||
hlt
|
||||
jmp oops
|
||||
|
||||
.data
|
||||
.align 2
|
||||
|
|
|
|||
|
|
@ -74,22 +74,22 @@ start:
|
|||
|
||||
start1:
|
||||
# set up %ds
|
||||
mov %cs, %ax
|
||||
mov %ax, %ds
|
||||
movl %cs, %ax
|
||||
movl %ax, %ds
|
||||
|
||||
# set up %ss and %esp
|
||||
data32
|
||||
mov $BOOTSEG, %eax
|
||||
mov %ax, %ss
|
||||
movl $BOOTSEG, %eax
|
||||
movl %ax, %ss
|
||||
data32
|
||||
mov $BOOTSTACK, %esp
|
||||
movl $BOOTSTACK, %esp
|
||||
|
||||
/*** set up %es, (where we will load boot2 to) ***/
|
||||
mov %ax, %es
|
||||
movl %ax, %es
|
||||
|
||||
#ifdef DEBUG
|
||||
data32
|
||||
mov $one, %esi
|
||||
movl $one, %esi
|
||||
data32
|
||||
call message
|
||||
#endif
|
||||
|
|
@ -103,18 +103,18 @@ fd:
|
|||
# reset the disk system
|
||||
#ifdef DEBUG
|
||||
data32
|
||||
mov $two, %esi
|
||||
movl $two, %esi
|
||||
data32
|
||||
call message
|
||||
#endif
|
||||
movb $0x0, %ah
|
||||
int $0x13
|
||||
data32
|
||||
mov $0x0001, %ecx # cyl 0, sector 1
|
||||
movl $0x0001, %ecx # cyl 0, sector 1
|
||||
movb $0, %dh # head
|
||||
#ifdef DEBUG
|
||||
data32
|
||||
mov $three, %esi
|
||||
movl $three, %esi
|
||||
data32
|
||||
call message
|
||||
#endif
|
||||
|
|
@ -124,18 +124,18 @@ fd:
|
|||
hd: /**** load sector 0 into the BOOTSEG ****/
|
||||
#ifdef DEBUG
|
||||
data32
|
||||
mov $four, %esi
|
||||
movl $four, %esi
|
||||
data32
|
||||
call message
|
||||
#endif
|
||||
data32
|
||||
mov $0x0201, %eax
|
||||
xor %ebx, %ebx # %bx = 0
|
||||
movl $0x0201, %eax
|
||||
xorl %ebx, %ebx # %bx = 0
|
||||
data32
|
||||
mov $0x0001, %ecx
|
||||
movl $0x0001, %ecx
|
||||
#ifdef DEBUG
|
||||
data32
|
||||
mov $five, %esi
|
||||
movl $five, %esi
|
||||
data32
|
||||
call message
|
||||
#endif
|
||||
|
|
@ -148,9 +148,9 @@ hd: /**** load sector 0 into the BOOTSEG ****/
|
|||
|
||||
/***# find the first 386BSD partition *****/
|
||||
data32
|
||||
mov $PARTSTART, %ebx
|
||||
movl $PARTSTART, %ebx
|
||||
data32
|
||||
mov $NUMPART, %ecx
|
||||
movl $NUMPART, %ecx
|
||||
again:
|
||||
addr32
|
||||
movb %es:4(%ebx), %al
|
||||
|
|
@ -158,11 +158,11 @@ again:
|
|||
data32
|
||||
je found
|
||||
data32
|
||||
add $PARTSZ, %ebx
|
||||
addl $PARTSZ, %ebx
|
||||
data32
|
||||
loop again
|
||||
data32
|
||||
mov $enoboot, %esi
|
||||
movl $enoboot, %esi
|
||||
data32
|
||||
jmp err_stop
|
||||
|
||||
|
|
@ -189,7 +189,7 @@ found:
|
|||
load:
|
||||
movb $0x2, %ah /* function 2 */
|
||||
movb $LOADSZ, %al /* number of blocks */
|
||||
xor %ebx, %ebx /* %bx = 0, put it at 0 in the BOOTSEG */
|
||||
xorl %ebx, %ebx /* %bx = 0, put it at 0 in the BOOTSEG */
|
||||
int $0x13
|
||||
data32
|
||||
jb read_error
|
||||
|
|
@ -200,7 +200,7 @@ load:
|
|||
|
||||
#ifdef DEBUG
|
||||
data32
|
||||
mov $six, %esi
|
||||
movl $six, %esi
|
||||
data32
|
||||
call message
|
||||
#endif
|
||||
|
|
@ -213,7 +213,7 @@ load:
|
|||
|
||||
read_error:
|
||||
data32
|
||||
mov $eread, %esi
|
||||
movl $eread, %esi
|
||||
err_stop:
|
||||
data32
|
||||
call message
|
||||
|
|
@ -232,11 +232,11 @@ message:
|
|||
*/
|
||||
|
||||
data32
|
||||
push %eax
|
||||
pushl %eax
|
||||
data32
|
||||
push %ebx
|
||||
pushl %ebx
|
||||
data32
|
||||
mov $0x0001, %ebx
|
||||
movl $0x0001, %ebx
|
||||
cld
|
||||
|
||||
nextb:
|
||||
|
|
@ -250,15 +250,15 @@ nextb:
|
|||
jmp nextb
|
||||
done:
|
||||
data32
|
||||
pop %ebx
|
||||
popl %ebx
|
||||
data32
|
||||
pop %eax
|
||||
popl %eax
|
||||
data32
|
||||
ret
|
||||
|
||||
stop: hlt
|
||||
data32
|
||||
jmp stop # halt doesnt actually halt forever
|
||||
stop:
|
||||
cli
|
||||
hlt
|
||||
|
||||
/* error messages */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue