Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.
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#!/bin/sh
# Translate a Mu program to a bootable disk image.
set -e
# Map of the Mu code disk
export DISK=20160 # 20*16*63 512-byte sectors = almost 10MB
dd if=/dev/zero of=code.img count=$DISK status=none
# code: sectors 0-8999
# font: sectors 9000-10079 (1080 sectors = space enough for 16k glyphs (1080 * 512 / 34 bytes per glyph))
export FONT=9000 # keep this sync'd with boot.subx
# debug: sector 10080 onwards
export DEBUG=10080
## Code
cat $* [0-9]*.mu |linux/mu > a.subx
cat boot.subx mu-init.subx [0-9]*.subx a.subx |linux/braces > a.braces
cat a.braces |linux/calls > a.calls
cat a.calls |linux/sigils > a.sigils
cat a.sigils |linux/tests > a.tests
# no assort since baremetal SubX doesn't have segments yet
cat a.tests |linux/dquotes > a.dquotes
cat a.dquotes |linux/pack > a.pack
cat a.pack |linux/survey_baremetal > labels
cat a.pack |linux/labels_baremetal labels > a.survey
cat a.survey |linux/hex > a.bin
dd if=a.bin of=code.img conv=notrunc status=none
if [ `wc -c < a.bin` -ge 492544 ] # 15 tracks * 63 sectors per track * 512 bytes per sector (keep this sync'd with boot.subx)
then
echo "a.bin won't all be loaded on boot"
exit 1
fi
if [ `wc -c < a.bin` -ge 492544 ] # 15 tracks * 63 sectors per track * 512 bytes per sector
then
echo "a.bin will overwrite BIOS/Video memory; you'll need to adjust boot.subx to load code to some other non-contiguous area of memory"
exit 1
fi
if [ `wc -c < a.bin` -ge $(($FONT*512)) ]
then
echo "a.bin will overwrite font in disk"
exit 1
fi
## Latter half of disk is for debug info
if [ `wc -c < labels` -ge 1048576 ] # 8 reads * 256 sectors * 512 bytes per sector
then
echo "labels won't all be loaded on abort"
exit 1
fi
if [ `wc -l < labels` -gt 20480 ] # 0x5000 stream capacity in abort.subx
then
echo "abort will go into infinite regress"
exit 1
fi
dd if=labels of=code.img seek=$DEBUG conv=notrunc status=none # keep this sync'd with abort.subx
## Font data at another well-defined location
cat font.subx |sed 's,/[^ ]*,,' |linux/hex > a.font
if [ `wc -c < a.font` -ge 262144 ] # 0x200 sectors * 512 bytes per sector (keep this sync'd with boot.subx)
then
echo "font won't all be loaded on boot"
exit 1
fi
if [ `wc -c < a.font` -ge 14680064 ] # 0x00e00000 = 0x00f00000 - 0x00100000
then
echo "font is so large it overlaps the ISA memory hole; see https://wiki.osdev.org/Memory_Map_(x86)"
exit 1
fi
if [ `wc -c < a.font` -ge $(( ($DEBUG - $FONT) * 512 )) ]
then
echo "font will overwrite debug info in disk"
exit 1
fi
dd if=a.font of=code.img seek=$FONT conv=notrunc status=none