build: 1.44MB and 2.88MB floppy
This commit is contained in:
parent
0cf565c93c
commit
d70a9436a0
19
Makefile
19
Makefile
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@ -17,7 +17,7 @@ MK_COMMIT := \"$(shell git rev-parse --short HEAD)\"
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SUBDIRS := external tools include boot kernel lib bin
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TARGET = stupid.tar.gz floppy_boot.img
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TARGET = stupid.tar.gz floppy1440.img floppy2880.img
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ifneq ($(OS),Windows_NT)
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EXEXT =
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TARGET += stupid.iso stupid.hdd
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@ -48,14 +48,23 @@ stupid.hdd: $(SUBDIRS)
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stupid.tar.gz: $(SUBDIRS)
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tar -czvf $@ sysroot
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.PHONY: floppy_boot.img
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floppy_boot.img: $(SUBDIRS)
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.PHONY: floppy1440.img
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floppy1440.img: $(SUBDIRS)
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dd if=/dev/zero of=$@ bs=512 count=1440
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mformat -C -f 1440 -i $@
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dd if=boot/bootsect/bootsector.bin of=$@ conv=notrunc
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dd if=boot/bootsect/boot_floppy1440.bin of=$@ conv=notrunc
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mcopy -i $@ boot/loader/stpdldr.sys ::/STPDLDR.SYS
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mcopy -i $@ kernel/vmstupid.sys ::/VMSTUPID.SYS
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.PHONY: floppy2880.img
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floppy2880.img: $(SUBDIRS)
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dd if=/dev/zero of=$@ bs=512 count=2880
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mformat -C -f 2880 -i $@
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dd if=boot/bootsect/boot_floppy2880.bin of=$@ conv=notrunc
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mcopy -i $@ boot/loader/stpdldr.sys ::/STPDLDR.SYS
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mcopy -i $@ kernel/vmstupid.sys ::/VMSTUPID.SYS
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OVMF32.fd:
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wget 'https://retrage.github.io/edk2-nightly/bin/DEBUGIa32_OVMF.fd' -O $@
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@ -63,7 +72,7 @@ OVMF32.fd:
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run: all
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qemu-system-i386 \
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-rtc base=localtime \
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-drive file=floppy_boot.img,if=none,format=raw,id=boot \
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-drive file=floppy1440.img,if=none,format=raw,id=boot \
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-drive file=fat:rw:./sysroot,if=none,id=hdd \
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-device floppy,drive=boot \
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-device ide-hd,drive=hdd \
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@ -1,4 +1,5 @@
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TARGET = bootsector.bin
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TARGET = boot_floppy1440.bin \
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boot_floppy2880.bin
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FLOPPY_SRCS = floppy.asm \
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../common/const.inc \
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@ -7,9 +8,12 @@ FLOPPY_SRCS = floppy.asm \
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.PHONY: all
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all: $(TARGET)
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bootsector.bin: $(FLOPPY_SRCS)
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boot_floppy1440.bin: $(FLOPPY_SRCS)
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$(AS) floppy.asm $@
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boot_floppy2880.bin: $(FLOPPY_SRCS)
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$(AS) -DFLOPPY_SIZE=FLOPPY_2880 floppy.asm $@
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.PHONY: clean
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clean:
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$(RM) $(TARGET)
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@ -3,30 +3,42 @@
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use16
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include '../common/const.inc'
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include '../common/macro.inc'
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org BOOTSECT_BASE
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jmp short _start
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nop
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if FLOPPY_SIZE eq FLOPPY_2880
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SECTORS_PER_CLUSTER = 2
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ROOT_DIR_ENTRIES = 240
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TOTAL_SECTORS = 5760
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SECTORS_PER_TRACK = 36
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else
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SECTORS_PER_CLUSTER = 1
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ROOT_DIR_ENTRIES = 224
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TOTAL_SECTORS = 2880
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SECTORS_PER_TRACK = 18
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end if
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; Boot Record
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OEM_identifier db 'STUPID '
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bytes_per_sector dw 512
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sectors_per_cluster db 1
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sectors_per_cluster db SECTORS_PER_CLUSTER
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reserved_sectors dw 1
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FAT_count db 2
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root_dir_entries dw 224
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total_sectors dw 2880
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root_dir_entries dw ROOT_DIR_ENTRIES
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total_sectors dw TOTAL_SECTORS
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media_desc_type db 0xF0
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sectors_per_FAT dw 9
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sectors_per_track dw 18
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sectors_per_track dw SECTORS_PER_TRACK
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heads_per_cylinder dw 2
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hidden_sectors dd 0
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large_sector_count dd 0
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; Extended Boot Record
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drive_number db 0x0
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reserved db 0x0
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drive_number db 0
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reserved db 0
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signature db 0x29 ; 0x28 or 0x29
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volume_id dd 0xB00B135 ; hope mine will grow :'(
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volume_label db 'Stupid Boot'
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@ -4,7 +4,7 @@
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;;
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;; Parameters:
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;;
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;; si - null-terminated string to print
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;; SI - null-terminated string to print
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;;
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bios_print:
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lodsb
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@ -1,180 +1,189 @@
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ATTR_READ_ONLY = 0x01
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ATTR_HIDDEN = 0x02
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ATTR_SYSTEM = 0x04
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ATTR_VOLUME_ID = 0x08
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ATTR_DIRECTORY = 0x10
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ATTR_ARCHIVE = 0x20
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;; File: fat12.inc
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struc fat_entry
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{
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.name db 8 dup ?
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.ext db 3 dup ?
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.attrs db ?
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.reserved dw ?
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.creation_time dw ?
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.creation_date dw ?
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.access_date dw ?
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.reserved2 dw ?
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.mod_time dw ?
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.mod_date dw ?
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.start dw ?
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.size dd ?
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}
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ATTR_READ_ONLY = 0x01
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ATTR_HIDDEN = 0x02
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ATTR_SYSTEM = 0x04
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ATTR_VOLUME_ID = 0x08
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ATTR_DIRECTORY = 0x10
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ATTR_ARCHIVE = 0x20
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virtual at di
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struc fat_entry
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{
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.name db 8 dup ?
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.ext db 3 dup ?
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.attrs db ?
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.reserved dw ?
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.creation_time dw ?
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.creation_date dw ?
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.access_date dw ?
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.reserved2 dw ?
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.mod_time dw ?
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.mod_date dw ?
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.start dw ?
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.size dd ?
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}
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defn fat_entry
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fat_entry fat_entry
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end virtual
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; CHS to LBA
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; LBA = (C * HPC + H) * SPT + (S - 1)
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; CHS to LBA
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; LBA = (C * HPC + H) * SPT + (S - 1)
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;;; Read sectors from disk to buffer
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;;;
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;;; @param AX LBA starting sector
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;;; @param CX sector count
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;;; @param ES:BX buffer
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;;;
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;; Function: disk_read_sectors
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;; Read sectors from disk to buffer
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;;
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;; Parameters:
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;;
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;; AX - LBA starting sector
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;; CX - sector count
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;; ES:BX - buffer
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;;
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disk_read_sectors:
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; https://en.wikipedia.org/wiki/Logical_block_addressing
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; convert LBA to CHS
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; HPC = Head per Cluster
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; SPT = Sector per Track
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; https://en.wikipedia.org/wiki/Logical_block_addressing
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; convert LBA to CHS
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; HPC = Head per Cluster
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; SPT = Sector per Track
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; S = (LBA % SPT) + 1
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push ax
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push bx
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push cx
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xor dx, dx
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div word [sectors_per_track]
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inc dx
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mov [S], dx
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; S = (LBA % SPT) + 1
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push ax
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push bx
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push cx
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xor dx, dx
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div word [sectors_per_track]
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inc dx
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mov [S], dx
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; H = (LBA / SPT) % HPC
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; C = LBA / (HPC * SPT)
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xor dx, dx
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div word [heads_per_cylinder]
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mov [C], ax
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mov [H], dx
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; H = (LBA / SPT) % HPC
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; C = LBA / (HPC * SPT)
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xor dx, dx
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div word [heads_per_cylinder]
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mov [C], ax
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mov [H], dx
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; read sectors
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mov ah, 0x2
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mov al, 0x1
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mov ch, byte [C]
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mov cl, byte [S]
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mov dh, byte [H]
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mov dl, [drive_number]
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; read sectors
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mov ah, 0x2
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mov al, 0x1
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mov ch, byte [C]
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mov cl, byte [S]
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mov dh, byte [H]
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mov dl, [drive_number]
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int 0x13
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jc @f
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pop cx
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pop bx
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pop ax
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add bx, word [bytes_per_sector]
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inc ax
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loop disk_read_sectors
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ret
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int 0x13
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jc @f
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pop cx
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pop bx
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pop ax
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add bx, word [bytes_per_sector]
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inc ax
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loop disk_read_sectors
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ret
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@@:
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mov si, msg_error_sector
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call bios_print
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ret
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mov si, msg_error_sector
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call bios_print
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ret
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C dw 0x00
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H dw 0x00
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S dw 0x00
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;; Function: fat_load_root
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fat_load_root:
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mov ax, DISK_BUFFER/0x10
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mov es, ax
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mov ax, DISK_BUFFER/0x10
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mov es, ax
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; load root directory
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mov ax, [sectors_per_FAT]
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xor cx, cx
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mov cl, [FAT_count]
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mul cx
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add ax, [reserved_sectors]
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push ax
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; load root directory
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mov ax, [sectors_per_FAT]
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xor cx, cx
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mov cl, [FAT_count]
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mul cx
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add ax, [reserved_sectors]
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push ax
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mov bx, [bytes_per_sector]
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mov cl, 0x5
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shr bx, cl
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mov ax, [root_dir_entries]
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xor dx, dx
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div bx
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mov cx, ax
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pop ax
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mov bx, [bytes_per_sector]
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mov cl, 0x5
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shr bx, cl
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mov ax, [root_dir_entries]
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xor dx, dx
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div bx
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mov cx, ax
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pop ax
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mov [data_start], ax
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add [data_start], cx
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mov [data_start], ax
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add [data_start], cx
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xor bx, bx
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xor bx, bx
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call disk_read_sectors
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call disk_read_sectors
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ret
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ret
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;; @param SI filename to search
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;; Function: fat_search_root
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;;
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;; Parameters:
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;;
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;; SI - file to search
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;;
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fat_search_root:
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mov cx, [root_dir_entries]
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mov di, 0x0
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mov cx, [root_dir_entries]
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mov di, 0x0
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@@:
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push si
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push cx
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mov cx, 0xB ; name(8) + ext(3)
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push di
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rep cmpsb
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pop di
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pop cx
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pop si
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je .file_found
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add di, 0x20
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loop @b
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; set carry if not found
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stc
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ret
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push si
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push cx
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mov cx, 0xB ; name(8) + ext(3)
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push di
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rep cmpsb
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pop di
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pop cx
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pop si
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je .file_found
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add di, 0x20
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loop @b
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; set carry if not found
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stc
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ret
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.file_found:
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mov ax, [es:fat_entry.start]
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clc
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ret
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mov ax, [es:di + fat_entry.start]
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clc
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ret
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;;; @param AX cluster
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;;; @param ES:BX buffer
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;; Function: fat_load_binary
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;;
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;; Parameters:
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;; AX - cluster
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;; ES:BX - buffer
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fat_load_binary:
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push ax
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sub ax, 0x2
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xor cx, cx
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mov cl, [sectors_per_cluster]
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mul cx
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push ax
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sub ax, 0x2
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xor cx, cx
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mov cl, [sectors_per_cluster]
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mul cx
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add ax, [data_start]
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xor cx, cx
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mov cl, [sectors_per_cluster]
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call disk_read_sectors
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add ax, [data_start]
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xor cx, cx
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mov cl, [sectors_per_cluster]
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call disk_read_sectors
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pop ax
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mov cx, ax
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mov dx, ax
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shr dx, 0x1
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add cx, dx
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push bx
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mov bx, DISK_BUFFER
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add bx, cx
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mov dx, [bx]
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pop bx
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pop ax
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mov cx, ax
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mov dx, ax
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shr dx, 0x1
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add cx, dx
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push bx
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mov bx, DISK_BUFFER
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add bx, cx
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mov dx, [bx]
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pop bx
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test ax, 0x1
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jnz .odd_cluster
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test ax, 0x1
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jnz .odd_cluster
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.even_cluster:
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and dx, 0xFFF
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jmp .end
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and dx, 0xFFF
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jmp .end
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.odd_cluster:
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shr dx, 0x4
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shr dx, 0x4
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.end:
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mov ax, dx
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cmp dx, 0xFF0
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jb fat_load_binary
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ret
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mov ax, dx
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cmp dx, 0xFF0
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jb fat_load_binary
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ret
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msg_error_sector db "ERROR: reading sector", CR, LF, 0
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@ -20,7 +20,7 @@ Timestamp: Updated yyyy/mm/dd
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# These are indexes you deleted, so Natural Docs will not add them again
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# unless you remove them from this line.
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Don't Index: Macros, Variables, Classes
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Don't Index: Variables, Macros, Classes
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# --------------------------------------------------------------------------
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@ -65,6 +65,7 @@ Group: BootLoader {
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Group: Common {
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File: bios.inc (boot/common/bios.inc)
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File: fat12.inc (boot/common/fat12.inc)
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} # Group: Common
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Group: EFI {
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