94 lines
1.9 KiB
HolyC
94 lines
1.9 KiB
HolyC
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#define MODULE_SIZE 1*BLK_SIZE
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#define BOOT_HIGH_LOC_HD ((BOOT_RAM_LIMIT-\
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(BOOT_STK_SIZE+MODULE_SIZE))>>4)
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DefinePrint(
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"DD_BOOT_HIGH_LOC_HD","%08X",BOOT_HIGH_LOC_HD<<4);
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asm {
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USE16
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BHD_CODE::
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#define BHD_START (BHD_CODE-offset(CFAT32Boot.code))
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CLD
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MOV AX,BOOT_HIGH_LOC_HD
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MOV ES,AX
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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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CALL BHD_GET_RIP
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BHD_GET_RIP:
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POP BX
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SUB BX,BHD_GET_RIP-BHD_START
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SHR BX,4
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//This copies this bootloader's code to 0x$TX,"00096C00",D="DD_BOOT_HIGH_LOC_HD"$
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MOV AX,CS
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ADD AX,BX
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MOV DS,AX
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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_HD
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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_HD:BHD_HISTART
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DU16 BHD_HISTART-BHD_START,BOOT_HIGH_LOC_HD;
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BHD_BIOS_DRV_NUM: DU8 0;
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//Gets patched by $LK,"BootHDIns",A="MN:BootHDIns"$().
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BHD_BLK_CNT:: DU16 0;
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BHD_DAP: DU8 16,0,1,0; //One blk at a time
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BHD_DAP_BUF: DU16 0,0;
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//Gets patched by $LK,"BootHDIns",A="MN:BootHDIns"$().
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BHD_DAP_BLK:: //64-bit
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BHD_DAP_BLK_LO: DU32 0;
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BHD_DAP_BLK_HI: DU32 0;
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BHD_HISTART:
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MOV U8 [BHD_BIOS_DRV_NUM-BHD_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 [BHD_BLK_CNT-BHD_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 [BHD_DAP_BUF+2-BHD_START],AX //ES:0000
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MOV SI,BHD_DAP-BHD_START //DS:SI=DAP
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MOV AH,0x42
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MOV DL,U8 [BHD_BIOS_DRV_NUM-BHD_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 [BHD_DAP_BLK_LO-BHD_START]
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JNZ @@10
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INC U32 [BHD_DAP_BLK_HI-BHD_START]
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@@10: POP CX
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LOOP @@05
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XOR EBX,EBX
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MOV EAX,BOOT_SRC_HARDDRV //$MA-X+PU,"See sys_boot_src",LM="Find(\"sys_boot_src\",\"/*\");View;\n"$
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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 $LK,"::/Kernel/KStart16.HC",A="FL:::/Kernel/KStart16.HC,1"$
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BHD_END::
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#assert BHD_END-BHD_START<MODULE_SIZE-2
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}
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