#define MODULE_SIZE 1*BLK_SIZE
#define BOOT_HIGH_LOC_HD ((BOOT_RAM_LIMIT-\
(BOOT_STK_SIZE+MODULE_SIZE))>>4)
DefinePrint(
"DD_BOOT_HIGH_LOC_HD","%08X",BOOT_HIGH_LOC_HD<<4);
asm {
USE16
BHD_CODE::
#define BHD_START (BHD_CODE-offset(CFAT32Boot.code))
CLD
MOV AX,BOOT_HIGH_LOC_HD
MOV ES,AX
CLI
MOV SS,AX
MOV SP,BOOT_STK_SIZE+MODULE_SIZE
STI
CALL BHD_GET_RIP
BHD_GET_RIP:
POP BX
SUB BX,BHD_GET_RIP-BHD_START
SHR BX,4
//This copies this bootloader's code to 0x$TX,"00096C00",D="DD_BOOT_HIGH_LOC_HD"$
MOV AX,CS
ADD AX,BX
MOV DS,AX
MOV CX,MODULE_SIZE
XOR SI,SI
XOR DI,DI
REP_MOVSB
MOV AX,BOOT_HIGH_LOC_HD
MOV DS,AX
//My assembler doesn't support 16-bit very well.
DU8 0xEA; //JMP BOOT_HIGH_LOC_HD:BHD_HISTART
DU16 BHD_HISTART-BHD_START,BOOT_HIGH_LOC_HD;
BHD_BIOS_DRV_NUM: DU8 0;
//Gets patched by BootHDIns().
BHD_BLK_CNT:: DU16 0;
BHD_DAP: DU8 16,0,1,0; //One blk at a time
BHD_DAP_BUF: DU16 0,0;
//Gets patched by BootHDIns().
BHD_DAP_BLK:: //64-bit
BHD_DAP_BLK_LO: DU32 0;
BHD_DAP_BLK_HI: DU32 0;
BHD_HISTART:
MOV U8 [BHD_BIOS_DRV_NUM-BHD_START],DL //Passed in by BIOS
MOV AX,BOOT_RAM_BASE/16
MOV ES,AX
XOR ECX,ECX
MOV CX,U16 [BHD_BLK_CNT-BHD_START]
@@05: PUSH CX //Blk cnt
//READ BLK
PUSH ES //Buf seg
MOV AX,ES
MOV U16 [BHD_DAP_BUF+2-BHD_START],AX //ES:0000
MOV SI,BHD_DAP-BHD_START //DS:SI=DAP
MOV AH,0x42
MOV DL,U8 [BHD_BIOS_DRV_NUM-BHD_START]
INT 0x13
POP AX //ES
ADD AX,BLK_SIZE/16
MOV ES,AX
INC U32 [BHD_DAP_BLK_LO-BHD_START]
JNZ @@10
INC U32 [BHD_DAP_BLK_HI-BHD_START]
@@10: POP CX
LOOP @@05
XOR EBX,EBX
MOV EAX,BOOT_SRC_HARDDRV //$MA-X+PU,"See sys_boot_src",LM="Find(\"sys_boot_src\",\"/*\");View;\n"$
//My assembler doesn't support 16-bit very well.
DU8 0xEA; //JMP BOOT_RAM_BASE:0000
DU16 0,BOOT_RAM_BASE/16;
//Continues here /Kernel/KStart16.HC",A="FL:::/Kernel/KStart16.HC,1
BHD_END::
#assert BHD_END-BHD_START<MODULE_SIZE-2
}