#define MODULE_SIZE 2*BLK_SIZE
#define BOOT_HIGH_LOC_MHD2 ((BOOT_RAM_LIMIT-\
(BOOT_STK_SIZE+MODULE_SIZE))>>4)
DefinePrint(
"DD_BOOT_HIGH_LOC_MHD2","%08X",BOOT_HIGH_LOC_MHD2<<4);
asm {
USE16
BMHD2_START::
MOV U32 FS:[0],'B'+0x2000+('2'+0x2000)<<16
MOV AX,BOOT_HIGH_LOC_MHD2
MOV ES,AX
//This copies this bootloader's code to 0x$TX,"00096A00",D="DD_BOOT_HIGH_LOC_MHD2"$
MOV AX,CS
MOV DS,AX
MOV U32 [BMHD2_OLD_CS_RIP-BMHD2_START],EBX
MOV U8 [BMHD2_BIOS_DRV_NUM-BMHD2_START],DL
MOV CX,MODULE_SIZE
XOR SI,SI
XOR DI,DI
REP_MOVSB
MOV AX,BOOT_HIGH_LOC_MHD2
MOV DS,AX
//My assembler doesn't support 16-bit very well.
DU8 0xEA; //JMP BOOT_HIGH_LOC_MHD2:BMHD2_HISTART
DU16 BMHD2_HISTART-BMHD2_START,BOOT_HIGH_LOC_MHD2;
BMHD2_BOOT_MSG::
DU8 256 DUP(0);
BMHD2_BIOS_DRV_NUM: DU8 0;
BMHD2_PAGE: DU8 0;
BMHD2_BLK_ARRAY:: DU64 8 DUP(0);
BMHD2_DAP: DU8 16,0,1,0; //One blk at a time
BMHD2_DAP_BUF: DU16 0,0;
BMHD2_DAP_BLK:: //64-bit
BMHD2_DAP_BLK_LO: DU32 0;
BMHD2_DAP_BLK_HI: DU32 0;
BMHD2_PUT_CHAR::
MOV AH,0xE
MOV BL,7 //Might be foreground color on some BIOS's
MOV BH,U8 [BMHD2_PAGE-BMHD2_START]
INT 0x10
BMHD2_RET::
RET
BMHD2_PUTS::
@@1: LODSB
TEST AL,AL
JZ BMHD2_RET
CALL BMHD2_PUT_CHAR
JMP @@1
BMHD2_GETCHAR:
XOR AH,AH
INT 0x16
PUSH AX
MOV AH,0x0E
MOV BX,0x07
INT 0x10
POP AX
RET
BMHD2_HISTART:
MOV AH,0xF
INT 0x10
MOV U8 [BMHD2_PAGE-BMHD2_START],BH //Video page
MOV U32 FS:[0],0
@@5: MOV SI,BMHD2_BOOT_MSG-BMHD2_START
CALL BMHD2_PUTS
CALL BMHD2_GETCHAR
CMP AL,'0'
JB @@5
CMP AL,'8'
JAE @@5
AND EAX,7
MOV EBX,U32 BMHD2_BLK_ARRAY-BMHD2_START[EAX*8]
MOV EAX,U32 BMHD2_BLK_ARRAY+4-BMHD2_START[EAX*8]
TEST EBX,EBX
JNZ @@10
TEST EAX,EAX
JZ @@5
@@10: MOV U32 [BMHD2_DAP_BLK_LO-BMHD2_START],EBX
MOV U32 [BMHD2_DAP_BLK_HI-BMHD2_START],EAX
MOV AX,U16 [BMHD2_OLD_CS_RIP-BMHD2_START]
SHR AX,4
ADD AX,U16 [BMHD2_OLD_CS_RIP+2-BMHD2_START]
MOV U16 [BMHD2_DAP_BUF+2-BMHD2_START],AX //ES:0000
MOV SI,BMHD2_DAP-BMHD2_START //DS:SI=DAP
MOV DL,U8 [BMHD2_BIOS_DRV_NUM-BMHD2_START]
MOV AH,0x42
INT 0x13
POP EBP
POP EDX
POP EBX
POP ECX
XOR EAX,EAX
POP GS
POP FS
POP ES
POP DS
POPFW
//My assembler doesn't support 16-bit very well.
DU8 0xEA; //JMP xxxx:yyyy
BMHD2_OLD_CS_RIP:
DU16 0,0;
BMHD2_END::
//Continues here ::/Adam/Opt/Boot/BootHD.HC
#assert BMHD2_END-BMHD2_START<MODULE_SIZE
}