mirror of
https://github.com/AYIDouble/x86-Assembly-Reverse-Engineering.git
synced 2026-06-21 00:46:54 +08:00
➕ Add
This commit is contained in:
AYIDouble
parent
73992a9ae0
commit
0706329497
8 changed files with 539 additions and 0 deletions
62
Assembler Intel Code/apm_shutdown.S
Normal file
62
Assembler Intel Code/apm_shutdown.S
Normal file
|
|
@ -0,0 +1,62 @@
|
||||||
|
#include "common.h"
|
||||||
|
|
||||||
|
BEGIN
|
||||||
|
|
||||||
|
movb $0x53,%ah #this is an APM command
|
||||||
|
movb $0x0,%al #installation check command
|
||||||
|
xorw %bx,%bx #device id (0 = APM BIOS)
|
||||||
|
int $0x15 #call the BIOS function through interrupt 15h
|
||||||
|
jc APM_error #if the carry flag is set there was an error
|
||||||
|
#the function was successful
|
||||||
|
#AX = APM version number
|
||||||
|
#AH = Major revision number (in BCD format)
|
||||||
|
#AL = Minor revision number (also BCD format)
|
||||||
|
#BX = ASCII characters "P" (in BH) and "M" (in BL)
|
||||||
|
#CX = APM flags (see the official documentation for more details)
|
||||||
|
|
||||||
|
#disconnect from any APM interface
|
||||||
|
movb $0x53,%ah #this is an APM command
|
||||||
|
movb $0x4,%al #interface disconnect command
|
||||||
|
xorw %bx,%bx #device id (0 = APM BIOS)
|
||||||
|
int $0x15 #call the BIOS function through interrupt 15h
|
||||||
|
jc .disconnect_error #if the carry flag is set see what the fuss is about.
|
||||||
|
jmp .no_error
|
||||||
|
|
||||||
|
.disconnect_error: #the error code is in ah.
|
||||||
|
cmpb $0x3,%ah #if the error code is anything but 03h there was an error.
|
||||||
|
jne APM_error #the error code 03h means that no interface was connected in the first place.
|
||||||
|
|
||||||
|
.no_error:
|
||||||
|
#the function was successful
|
||||||
|
#Nothing is returned.
|
||||||
|
|
||||||
|
#connect to an APM interface
|
||||||
|
movb $0x53,%ah #this is an APM command
|
||||||
|
movb $0x01,%al #see above description
|
||||||
|
xorw %bx,%bx #device id (0 = APM BIOS)
|
||||||
|
int $0x15 #call the BIOS function through interrupt 15h
|
||||||
|
jc APM_error #if the carry flag is set there was an error
|
||||||
|
#the function was successful
|
||||||
|
#The return values are different for each interface.
|
||||||
|
#The Real Mode Interface returns nothing.
|
||||||
|
#See the official documentation for the
|
||||||
|
#return values for the protected mode interfaces.
|
||||||
|
|
||||||
|
#Enable power management for all devices
|
||||||
|
movb $0x53,%ah #this is an APM command
|
||||||
|
movb $0x8,%al #Change the state of power management...
|
||||||
|
movw $0x001,%bx #...on all devices to...
|
||||||
|
movw $0x001,%cx #...power management on.
|
||||||
|
int $0x15 #call the BIOS function through interrupt 15h
|
||||||
|
jc APM_error #if the carry flag is set there was an error
|
||||||
|
|
||||||
|
#Set the power state for all devices
|
||||||
|
movb $0x53,%ah #this is an APM command
|
||||||
|
movb $0x07,%al #Set the power state...
|
||||||
|
movw $0x0001,%bx #...on all devices to...
|
||||||
|
movw $0x0003,%cx #see above
|
||||||
|
int $0x15 #call the BIOS function through interrupt 15h
|
||||||
|
jc APM_error #if the carry flag is set there was an error
|
||||||
|
|
||||||
|
APM_error:
|
||||||
|
hlt
|
||||||
7
Assembler Intel Code/bios_keyboard_loop.S
Normal file
7
Assembler Intel Code/bios_keyboard_loop.S
Normal file
|
|
@ -0,0 +1,7 @@
|
||||||
|
#include "common.h"
|
||||||
|
BEGIN
|
||||||
|
start:
|
||||||
|
mov $0x00, %ah
|
||||||
|
int $0x16
|
||||||
|
PUTC <%al>
|
||||||
|
jmp start
|
||||||
4
Assembler Intel Code/infinite_loop.S
Normal file
4
Assembler Intel Code/infinite_loop.S
Normal file
|
|
@ -0,0 +1,4 @@
|
||||||
|
#include "common.h"
|
||||||
|
BEGIN
|
||||||
|
loop:
|
||||||
|
jmp loop
|
||||||
8
Assembler Intel Code/intel-protected/build.sh
Normal file
8
Assembler Intel Code/intel-protected/build.sh
Normal file
|
|
@ -0,0 +1,8 @@
|
||||||
|
ASM386 STARTUP.ASM
|
||||||
|
ASM386 MAIN.ASM
|
||||||
|
BLD386 STARTUP.OBJ, MAIN.OBJ buildfile(EPROM.BLD) bootstrap(STARTUP) Bootload
|
||||||
|
# BLD386 performs several operations in this example:
|
||||||
|
# It allocates physical memory location to segments and tables.
|
||||||
|
# It generates tables using the build file and the input files.
|
||||||
|
# It links object files and resolves references.
|
||||||
|
# It generates a boot-loadable file to be programmed into the EPROM.
|
||||||
38
Assembler Intel Code/intel-protected/eprom.bld
Normal file
38
Assembler Intel Code/intel-protected/eprom.bld
Normal file
|
|
@ -0,0 +1,38 @@
|
||||||
|
INIT_BLD_EXAMPLE;
|
||||||
|
|
||||||
|
SEGMENT
|
||||||
|
*SEGMENTS(DPL = 0),
|
||||||
|
startup.startup_code(BASE = 0FFFF0000H)
|
||||||
|
;
|
||||||
|
|
||||||
|
TASK
|
||||||
|
BOOT_TASK(OBJECT = startup, INITIAL,DPL = 0,
|
||||||
|
NOT INTENABLED),
|
||||||
|
PROTECTED_MODE_TASK(OBJECT = main_module,DPL = 0,
|
||||||
|
NOT INTENABLED)
|
||||||
|
|
||||||
|
TABLE
|
||||||
|
GDT (
|
||||||
|
LOCATION = GDT_EPROM,
|
||||||
|
ENTRY = (
|
||||||
|
10: PROTECTED_MODE_TASK,
|
||||||
|
startup.startup_code,
|
||||||
|
startup.startup_data,
|
||||||
|
main_module.data,
|
||||||
|
main_module.code,
|
||||||
|
main_module.stack
|
||||||
|
)
|
||||||
|
),
|
||||||
|
IDT (
|
||||||
|
LOCATION = IDT_EPROM
|
||||||
|
);
|
||||||
|
|
||||||
|
MEMORY
|
||||||
|
(
|
||||||
|
RESERVE = (0..3FFFH,
|
||||||
|
-- Area for the GDT, IDT, TSS copied from ROM
|
||||||
|
60000H..0FFFEFFFFH),
|
||||||
|
RANGE = (ROM_AREA = ROM (0FFFF0000H..0FFFFFFFFH)),
|
||||||
|
-- Eprom size 64K
|
||||||
|
RANGE = (RAM_AREA = RAM (4000H..05FFFFH))
|
||||||
|
)
|
||||||
12
Assembler Intel Code/intel-protected/main.asm
Normal file
12
Assembler Intel Code/intel-protected/main.asm
Normal file
|
|
@ -0,0 +1,12 @@
|
||||||
|
NAME main_module
|
||||||
|
data SEGMENT RW
|
||||||
|
dw 1000 dup(?)
|
||||||
|
DATA ENDS
|
||||||
|
stack stackseg 800
|
||||||
|
CODE SEGMENT ER use32 PUBLIC
|
||||||
|
main_start:
|
||||||
|
nop
|
||||||
|
nop
|
||||||
|
nop
|
||||||
|
CODE ENDS
|
||||||
|
END main_start, ds:data, ss:stack
|
||||||
393
Assembler Intel Code/intel-protected/startup.asm
Normal file
393
Assembler Intel Code/intel-protected/startup.asm
Normal file
|
|
@ -0,0 +1,393 @@
|
||||||
|
; TODO finish converting this to a text file that looks like the PDF...
|
||||||
|
|
||||||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||||
|
;
|
||||||
|
; ASSUMPTIONS:
|
||||||
|
;
|
||||||
|
; 1. The bottom 64K of memory is ram, and can be used for
|
||||||
|
; scratch space by this module.
|
||||||
|
;
|
||||||
|
; 2. The system has sufficient free usable ram to copy the
|
||||||
|
; initial GDT, IDT, and TSS
|
||||||
|
;
|
||||||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||||
|
|
||||||
|
; configuration data - must match with build definition
|
||||||
|
|
||||||
|
CS_BASE EQU 0FFFF0000H
|
||||||
|
; CS_BASE is the linear address of the segment STARTUP_CODE
|
||||||
|
; - this is specified in the build language file
|
||||||
|
|
||||||
|
RAM_START EQU 400H
|
||||||
|
; RAM_START is the start of free, usable ram in the linear
|
||||||
|
; memory space. The GDT, IDT, and initial TSS will be
|
||||||
|
; copied above this space, and a small data segment will be
|
||||||
|
; discarded at this linear address. The 32-bit word at
|
||||||
|
; RAM_START will contain the linear address of the first
|
||||||
|
; free byte above the copied tables - this may be useful if
|
||||||
|
; a memory manager is used.
|
||||||
|
|
||||||
|
TSS_INDEX EQU 10
|
||||||
|
; TSS_INDEX is the index of the TSS of the first task to
|
||||||
|
; run after startup
|
||||||
|
|
||||||
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||||
|
|
||||||
|
; ------------------------- STRUCTURES and EQU ---------------
|
||||||
|
; structures for system data
|
||||||
|
|
||||||
|
; TSS structure
|
||||||
|
TASK_STATE STRUC
|
||||||
|
link DW ?
|
||||||
|
link_h DW ?
|
||||||
|
ESP0 DD ?
|
||||||
|
SS0 DW ?
|
||||||
|
SS0_h DW ?
|
||||||
|
ESP1 DD ?
|
||||||
|
SS1 DW ?
|
||||||
|
SS1_h DW ?
|
||||||
|
ESP2 DD ?
|
||||||
|
SS2 DW ?
|
||||||
|
SS2_h DW ?
|
||||||
|
CR3_reg DD ?
|
||||||
|
EIP_reg DD ?
|
||||||
|
EFLAGS_regDD ?
|
||||||
|
EAX_reg DD ?
|
||||||
|
ECX_reg DD ?
|
||||||
|
EDX_reg DD ?
|
||||||
|
EBX_reg DD ?
|
||||||
|
ESP_reg DD ?
|
||||||
|
EBP_reg DD ?
|
||||||
|
ESI_reg DD ?
|
||||||
|
EDI_reg DD ?
|
||||||
|
ES_reg DW ?
|
||||||
|
ES_h DW ?
|
||||||
|
CS_reg DW ?
|
||||||
|
CS_h DW ?
|
||||||
|
SS_reg DW ?
|
||||||
|
SS_h DW ?
|
||||||
|
DS_reg DW ?
|
||||||
|
DS_h DW ?
|
||||||
|
FS_reg DW ?
|
||||||
|
FS_h DW ?
|
||||||
|
GS_reg DW ?
|
||||||
|
GS_h DW ?
|
||||||
|
LDT_reg DW ?
|
||||||
|
LDT_h DW ?
|
||||||
|
TRAP_reg DW ?
|
||||||
|
IO_map_baseDW ?
|
||||||
|
TASK_STATE ENDS
|
||||||
|
|
||||||
|
; basic structure of a descriptor
|
||||||
|
DESC STRUC
|
||||||
|
lim_0_15 DW ?
|
||||||
|
bas_0_15 DW ?
|
||||||
|
bas_16_23 DB ?
|
||||||
|
access DB ?
|
||||||
|
gran DB ?
|
||||||
|
bas_24_31 DB ?
|
||||||
|
DESC ENDS
|
||||||
|
|
||||||
|
; structure for use with LGDT and LIDT instructions
|
||||||
|
TABLE_REG STRUC
|
||||||
|
table_lim DW ?
|
||||||
|
table_linearDD ?
|
||||||
|
TABLE_REG
|
||||||
|
ENDS
|
||||||
|
; offset of GDT and IDT descriptors in builder generated GDT
|
||||||
|
GDT_DESC_OFF
|
||||||
|
EQU 1*SIZE(DESC)
|
||||||
|
IDT_DESC_OFF
|
||||||
|
EQU 2*SIZE(DESC)
|
||||||
|
; equates for building temporary GDT in RAM
|
||||||
|
LINEAR_SEL
|
||||||
|
EQU
|
||||||
|
1*SIZE (DESC)
|
||||||
|
LINEAR_PROTO_LO
|
||||||
|
EQU
|
||||||
|
00000FFFFH ; LINEAR_ALIAS
|
||||||
|
LINEAR_PROTO_HI
|
||||||
|
EQU
|
||||||
|
000CF9200H
|
||||||
|
; Protection Enable Bit in CR0
|
||||||
|
PE_BIT EQU 1B
|
||||||
|
; ------------------------------------------------------------
|
||||||
|
; ------------------------- DATA SEGMENT----------------------
|
||||||
|
; Initially, this data segment starts at linear 0, according
|
||||||
|
; to the processor’s power-up state.
|
||||||
|
STARTUP_DATA
|
||||||
|
SEGMENT RW
|
||||||
|
free_mem_linear_base
|
||||||
|
LABEL
|
||||||
|
DWORD
|
||||||
|
TEMP_GDT
|
||||||
|
LABEL
|
||||||
|
BYTE ; must be first in segment
|
||||||
|
TEMP_GDT_NULL_DESC
|
||||||
|
DESC
|
||||||
|
<>
|
||||||
|
TEMP_GDT_LINEAR_DESC DESC
|
||||||
|
<>
|
||||||
|
; scratch areas for LGDT and
|
||||||
|
LIDT instructions
|
||||||
|
TEMP_GDT_SCRATCH TABLE_REG
|
||||||
|
<>
|
||||||
|
APP_GDT_RAM
|
||||||
|
TABLE_REG
|
||||||
|
<>
|
||||||
|
APP_IDT_RAM
|
||||||
|
TABLE_REG
|
||||||
|
<>
|
||||||
|
; align end_data
|
||||||
|
fill
|
||||||
|
DW
|
||||||
|
?
|
||||||
|
; last thing in this segment - should be on a dword boundary
|
||||||
|
end_data
|
||||||
|
LABEL
|
||||||
|
BYTE
|
||||||
|
STARTUP_DATA
|
||||||
|
ENDS
|
||||||
|
; ------------------------------------------------------------
|
||||||
|
; ------------------------- CODE SEGMENT----------------------
|
||||||
|
STARTUP_CODE SEGMENT ER PUBLIC USE16
|
||||||
|
; filled in by builder
|
||||||
|
PUBLIC GDT_EPROM
|
||||||
|
GDT_EPROM
|
||||||
|
TABLE_REG
|
||||||
|
<>
|
||||||
|
; filled in by builder
|
||||||
|
PUBLIC IDT_EPROM
|
||||||
|
IDT_EPROM
|
||||||
|
TABLE_REG
|
||||||
|
<>
|
||||||
|
; entry point into startup code - the bootstrap will vector
|
||||||
|
; here with a near JMP generated by the builder.
|
||||||
|
This
|
||||||
|
; label must be in the top 64K of linear memory.
|
||||||
|
PUBLIC
|
||||||
|
STARTUP
|
||||||
|
STARTUP:
|
||||||
|
; DS,ES address the bottom 64K of flat linear memory
|
||||||
|
ASSUME DS:STARTUP_DATA, ES:STARTUP_DATA
|
||||||
|
; See Figure 9-4
|
||||||
|
; load GDTR with temporary GDT
|
||||||
|
LEA
|
||||||
|
EBX,TEMP_GDT ; build the TEMP_GDT in low ram,
|
||||||
|
MOV
|
||||||
|
DWORD PTR [EBX],0
|
||||||
|
; where we can address
|
||||||
|
MOV
|
||||||
|
DWORD PTR [EBX]+4,0
|
||||||
|
MOV
|
||||||
|
DWORD PTR [EBX]+8, LINEAR_PROTO_LO
|
||||||
|
MOV
|
||||||
|
DWORD PTR [EBX]+12, LINEAR_PROTO_HI
|
||||||
|
MOV
|
||||||
|
TEMP_GDT_scratch.table_linear,EBX
|
||||||
|
MOV
|
||||||
|
TEMP_GDT_scratch.table_lim,15
|
||||||
|
DB 66H; execute a 32 bit LGDT
|
||||||
|
LGDT
|
||||||
|
TEMP_GDT_scratch
|
||||||
|
; enter protected mode
|
||||||
|
MOV
|
||||||
|
EBX,CR0
|
||||||
|
OR
|
||||||
|
EBX,PE_BIT
|
||||||
|
MOV
|
||||||
|
CR0,EBX
|
||||||
|
; clear prefetch queue
|
||||||
|
JMP
|
||||||
|
CLEAR_LABEL
|
||||||
|
CLEAR_LABEL:
|
||||||
|
; make DS and ES address 4G of linear memory
|
||||||
|
MOV
|
||||||
|
CX,LINEAR_SEL
|
||||||
|
MOV
|
||||||
|
DS,CX
|
||||||
|
MOV
|
||||||
|
ES,CX
|
||||||
|
; do board specific initialization
|
||||||
|
;
|
||||||
|
;
|
||||||
|
; ......
|
||||||
|
;
|
||||||
|
; See Figure 9-5
|
||||||
|
; copy EPROM GDT to ram at:
|
||||||
|
;
|
||||||
|
RAM_START + size (STARTUP_DATA)
|
||||||
|
MOV
|
||||||
|
EAX,RAM_START
|
||||||
|
ADD
|
||||||
|
EAX,OFFSET (end_data)
|
||||||
|
MOV
|
||||||
|
EBX,RAM_START
|
||||||
|
MOV
|
||||||
|
ECX, CS_BASE
|
||||||
|
ADD
|
||||||
|
ECX, OFFSET (GDT_EPROM)
|
||||||
|
MOV
|
||||||
|
ESI, [ECX].table_linear
|
||||||
|
MOV
|
||||||
|
EDI,EAX
|
||||||
|
MOVZX
|
||||||
|
ECX, [ECX].table_lim
|
||||||
|
MOV
|
||||||
|
APP_GDT_ram[EBX].table_lim,CX
|
||||||
|
INC
|
||||||
|
ECX
|
||||||
|
MOV
|
||||||
|
EDX,EAX
|
||||||
|
MOV
|
||||||
|
APP_GDT_ram[EBX].table_linear,EAX
|
||||||
|
ADD
|
||||||
|
EAX,ECX
|
||||||
|
REP MOVS
|
||||||
|
BYTE PTR ES:[EDI],BYTE PTR DS:[ESI]
|
||||||
|
; fixup
|
||||||
|
GDT base in descriptor
|
||||||
|
MOV
|
||||||
|
ECX,EDX
|
||||||
|
MOV
|
||||||
|
[EDX].bas_0_15+GDT_DESC_OFF,CX
|
||||||
|
ROR
|
||||||
|
ECX,16
|
||||||
|
|
||||||
|
; PAGE 4 TODO remove later.
|
||||||
|
|
||||||
|
MOV
|
||||||
|
[EDX].bas_16_23+GDT_DESC_OFF,CL
|
||||||
|
[EDX].bas_24_31+GDT_DESC_OFF,CH
|
||||||
|
; copy EPROM IDT to ram at:
|
||||||
|
; RAM_START+size(STARTUP_DATA)+SIZE (EPROM GDT)
|
||||||
|
MOV
|
||||||
|
ECX, CS_BASE
|
||||||
|
ADD
|
||||||
|
ECX, OFFSET (IDT_EPROM)
|
||||||
|
MOV
|
||||||
|
ESI, [ECX].table_linear
|
||||||
|
MOV
|
||||||
|
EDI,EAX
|
||||||
|
MOVZX
|
||||||
|
ECX, [ECX].table_lim
|
||||||
|
MOV
|
||||||
|
APP_IDT_ram[EBX].table_lim,CX
|
||||||
|
INC
|
||||||
|
ECX
|
||||||
|
MOV
|
||||||
|
APP_IDT_ram[EBX].table_linear,EAX
|
||||||
|
MOV
|
||||||
|
EBX,EAX
|
||||||
|
ADD
|
||||||
|
EAX,ECX
|
||||||
|
REP MOVS
|
||||||
|
BYTE PTR ES:[EDI],BYTE PTR DS:[ESI]
|
||||||
|
MOV
|
||||||
|
ROR
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
LGDT
|
||||||
|
LIDT
|
||||||
|
REPMOV
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
ROL
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
LSL
|
||||||
|
INC
|
||||||
|
MOV
|
||||||
|
ADD
|
||||||
|
MOVS
|
||||||
|
MOV
|
||||||
|
ROL
|
||||||
|
MOV
|
||||||
|
MOV
|
||||||
|
ROL
|
||||||
|
;save start
|
||||||
|
MOV
|
||||||
|
; fixup IDT pointer in GDT
|
||||||
|
[EDX].bas_0_15+IDT_DESC_OFF,BX
|
||||||
|
EBX,16
|
||||||
|
[EDX].bas_16_23+IDT_DESC_OFF,BL
|
||||||
|
[EDX].bas_24_31+IDT_DESC_OFF,BH
|
||||||
|
; load GDTR and IDTR
|
||||||
|
EBX,RAM_START
|
||||||
|
DB
|
||||||
|
66H
|
||||||
|
; execute a 32 bit LGDT
|
||||||
|
APP_GDT_ram[EBX]
|
||||||
|
DB
|
||||||
|
66H
|
||||||
|
; execute a 32 bit LIDT
|
||||||
|
APP_IDT_ram[EBX]
|
||||||
|
; move the TSS
|
||||||
|
EDI,EAX
|
||||||
|
EBX,TSS_INDEX*SIZE(DESC)
|
||||||
|
ECX,GDT_DESC_OFF ;build linear address for TSS
|
||||||
|
GS,CX
|
||||||
|
DH,GS:[EBX].bas_24_31
|
||||||
|
DL,GS:[EBX].bas_16_23
|
||||||
|
EDX,16
|
||||||
|
DX,GS:[EBX].bas_0_15
|
||||||
|
ESI,EDX
|
||||||
|
ECX,EBX
|
||||||
|
ECX
|
||||||
|
EDX,EAX
|
||||||
|
EAX,ECX
|
||||||
|
BYTE PTR ES:[EDI],BYTE PTR DS:[ESI]
|
||||||
|
; fixup TSS pointer
|
||||||
|
GS:[EBX].bas_0_15,DX
|
||||||
|
EDX,16
|
||||||
|
GS:[EBX].bas_24_31,DH
|
||||||
|
GS:[EBX].bas_16_23,DL
|
||||||
|
EDX,16
|
||||||
|
of free ram at linear location RAMSTART
|
||||||
|
free_mem_linear_base+RAM_START,EAX
|
||||||
|
|
||||||
|
|
||||||
|
;assume no LDT used in the initial task - if necessary,
|
||||||
|
;code to move the LDT could be added, and should resemble
|
||||||
|
;that used to move the TSS
|
||||||
|
; load task register
|
||||||
|
LTR
|
||||||
|
BX
|
||||||
|
; No task switch, only descriptor loading
|
||||||
|
; See Figure 9-6
|
||||||
|
; load minimal set of registers necessary to simulate task
|
||||||
|
; switch
|
||||||
|
MOV
|
||||||
|
AX,[EDX].SS_reg
|
||||||
|
; start loading registers
|
||||||
|
MOV
|
||||||
|
EDI,[EDX].ESP_reg
|
||||||
|
MOV
|
||||||
|
SS,AX
|
||||||
|
MOV
|
||||||
|
ESP,EDI
|
||||||
|
; stack now valid
|
||||||
|
PUSH
|
||||||
|
DWORD PTR [EDX].EFLAGS_reg
|
||||||
|
PUSH
|
||||||
|
DWORD PTR [EDX].CS_reg
|
||||||
|
PUSH
|
||||||
|
DWORD PTR [EDX].EIP_reg
|
||||||
|
MOV
|
||||||
|
AX,[EDX].DS_reg
|
||||||
|
MOV
|
||||||
|
BX,[EDX].ES_reg
|
||||||
|
MOV
|
||||||
|
DS,AX
|
||||||
|
; DS and ES no longer linear memory
|
||||||
|
MOV
|
||||||
|
ES,BX
|
||||||
|
; simulate far jump to initial task
|
||||||
|
IRETD
|
||||||
|
STARTUP_CODE ENDS
|
||||||
|
END STARTUP, DS:STARTUP_DATA, SS:STARTUP_DATA
|
||||||
|
|
||||||
15
Assembler Intel Code/interrupt_keyboard.S
Normal file
15
Assembler Intel Code/interrupt_keyboard.S
Normal file
|
|
@ -0,0 +1,15 @@
|
||||||
|
#include "common.h"
|
||||||
|
BEGIN
|
||||||
|
CLEAR
|
||||||
|
/* I've read that the keyboard handler is the number 1 (second one),
|
||||||
|
* and each entry is 4 byte wide.
|
||||||
|
*/
|
||||||
|
movw $handler, 0x04
|
||||||
|
movw $0x00, 0x06
|
||||||
|
sti
|
||||||
|
loop:
|
||||||
|
jmp loop
|
||||||
|
handler:
|
||||||
|
PUTC $'a
|
||||||
|
iret
|
||||||
|
jmp loop
|
||||||
Loading…
Reference in a new issue