106 lines
2.1 KiB
C++
106 lines
2.1 KiB
C++
asm {
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#define MODULE_SIZE 1*BLK_SIZE
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#define BOOT_HIGH_LOC ((BOOT_RAM_LIMIT-(BOOT_STK_SIZE+MODULE_SIZE))>>4)
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USE16
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BMHD_START::
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BMHD_CODE::
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CLD
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MOV AX,BOOT_HIGH_LOC
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CLI
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MOV SS,AX
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MOV SP,BOOT_STK_SIZE+MODULE_SIZE
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STI
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PUSHFW
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PUSH DS
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PUSH ES
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PUSH FS
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PUSH GS
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PUSH ECX
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PUSH EBX
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PUSH EDX
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PUSH EBP
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MOV ES,AX
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MOV AX,VGA_TEXT_MEM_BASE/16
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MOV FS,AX
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MOV U32 FS:[0],'B'+0x2000+('1'+0x2000)<<16
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CALL BMHD_GET_IP
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BMHD_GET_IP:
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POP BX
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SUB BX,BMHD_GET_IP-BMHD_START
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MOV CX,BX
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SHR BX,4
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//Copy this bootloader code to just under 0x80000
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MOV AX,CS
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PUSH AX
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ADD AX,BX
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MOV DS,AX
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MOV U16 [BMHD_OLD_CS_IP-BMHD_START],CX
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POP U16 [BMHD_OLD_CS_IP+2-BMHD_START]
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MOV CX,MODULE_SIZE
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XOR SI,SI
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XOR DI,DI
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REP_MOVSB
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MOV AX,BOOT_HIGH_LOC
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MOV DS,AX
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//My assembler doesn't support 16-bit very well.
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DU8 0xEA; //JMP BOOT_HIGH_LOC:BMHD_HISTART
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DU16 BMHD_HISTART-BMHD_START,BOOT_HIGH_LOC;
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BMHD_BIOS_DRV_NUM: DU8 0;
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BMHD_OLD_CS_IP: DU16 0,0;
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//Gets patched by $LK,"MakeOSInstallPrtBootLoader","MN:MakeOSInstallPrtBootLoader"$().
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BMHD_BLK_CNT:: DU16 0;
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BMHD_DAP: DU8 16,0,1,0; //One blk at a time
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BMHD_DAP_BUF: DU16 0,0;
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//Gets patched by $LK,"MakeOSInstallPrtBootLoader","MN:MakeOSInstallPrtBootLoader"$().
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BMHD_DAP_BLK:: //64-bit
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BMHD_DAP_BLK_LO: DU32 0;
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BMHD_DAP_BLK_HI: DU32 0;
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BMHD_HISTART:
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MOV U8 [BMHD_BIOS_DRV_NUM-BMHD_START],DL //Passed in by BIOS
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MOV AX,BOOT_RAM_BASE/16
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MOV ES,AX
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XOR ECX,ECX
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MOV CX,U16 [BMHD_BLK_CNT-BMHD_START]
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@@05: PUSH CX //Blk cnt
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//READ BLK
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PUSH ES //Buf seg
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MOV AX,ES
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MOV U16 [BMHD_DAP_BUF+2-BMHD_START],AX //ES:0000
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MOV SI,BMHD_DAP-BMHD_START //DS:SI=DAP
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MOV AH,0x42
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MOV DL,U8 [BMHD_BIOS_DRV_NUM-BMHD_START]
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INT 0x13
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POP AX //ES
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ADD AX,BLK_SIZE/16
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MOV ES,AX
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INC U32 [BMHD_DAP_BLK_LO-BMHD_START]
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JNZ @@10
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INC U32 [BMHD_DAP_BLK_HI-BMHD_START]
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@@10: POP CX
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LOOP @@05
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MOV DL,U8 [BMHD_BIOS_DRV_NUM-BMHD_START]
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MOV EBX,U32 [BMHD_OLD_CS_IP-BMHD_START]
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//My assembler doesn't support 16-bit very well.
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DU8 0xEA; //JMP BOOT_RAM_BASE:0000
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DU16 0,BOOT_RAM_BASE/16;
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//Continues here $LK,"BMHD2_START","FF:::/TempleOS/Adam/Boot/BootMHD2.CPP,BMHD2_START"$
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BMHD_END::
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#assert BMHD_END-BMHD_START<=440
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}
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