12 commits

Author	SHA1	Message	Date
tkchia	247a2bd6ae	plat/msdos386: rename _psp[] to .psp, avoid namespace pollution	2022-08-26 17:32:50 +00:00
tkchia	249e4b9069	plat/msdos386: fix a few more issues with startup and stub code ... - correctly calculate size of BSS area to clear - make realloc routine set both ds & es to point to new data segment - correctly initialize real mode flags when simulating real mode interrupt via DPMI - other minor fixes	2022-08-24 10:17:15 +00:00
tkchia	95ed8ee484	plat/msdos386: fix startup code so that it works under dosemu2 ... - do not try to store data through code segment selectors - set each segment limit to segment size - 1, not segment size - get PSP segment while still in real/V86 mode (DPMI host might choose to return PM selector for int 0x21, ah = 0x62) - other minor fixes	2022-08-23 14:35:43 +00:00
David Given	5329c98b81	Simplify and fix reading and writing so they seem to work.	2022-08-18 21:21:33 +02:00
David Given	cc356b5c75	Programs now start up and can write to the console, but crash when reading.	2022-08-18 00:24:08 +02:00
David Given	48398b072a	write() system calls work; start going through the libsys.	2022-08-17 22:34:06 +02:00
David Given	680b6b9857	Marshal the environment, command line and PSP into 32-bit memory.	2022-08-11 23:36:23 +02:00
David Given	1764c6baa2	Made realloc work; the 32-bit process can now be resized to include bss and ... stack.	2022-08-10 16:14:12 +02:00
David Given	d464606dd6	We can now load and run 32-bit protected-mode executables. We have not, ... however, set up the data segment.	2022-08-09 23:49:18 +02:00
David Given	21b30ccadb	We can now switch to 32-bit mode.	2022-08-08 23:22:00 +02:00
David Given	1e0961c679	Do enough of the boot stub to produce an EXE header and enter DPMI protected ... mode.	2022-08-08 22:03:12 +02:00
David Given	6d9ac0b182	Add the nonfunctional boilerplate for the MSDOS 386 port.	2022-08-03 20:41:06 +02:00