stage2_ia32_pc.asm

The stage 2 bootloader for My Operating System (MOS)

Loads and prepares stage 3
Loads and constructs all other files in the root directory into a ramdisk
Enables Gate A20
Determines memory map
Brings the system in a state similar to that of a multiboot loader

Author

Marcel Sondaar

License

Educational purposes

Summary

stage2_ia32_pc.asm	The stage 2 bootloader for My Operating System (MOS)
Todo’s
Brendan Bug #1 - no kernel found error on P4 with less-than-perfect FDD
Functions
DoneLoad	prepare to boot mos86
GetDirCluster	DX = directory entry
GetNextCluster	Gets the next cluster value from the FAT table
LoadCluster	Loads a FAT cluster to RAM
LoadSector	Loads a sector (linear) from floppy to RAM
InitTextPos	Prepares the screen for addressing
InitA20	Enables A20 gate
InitA20test	Sets carry if A20 is enabled
InitGDT	Builds the bootstrap GDT
InitMemMap	builds the memory map of this computer
Todo’s
try alternative methods than E820

Todo’s

Brendan Bug #1 - no kernel found error on P4 with less-than-perfect FDD

Functions

DoneLoad

prepare to boot mos86

GetDirCluster

DX = directory entry

GetNextCluster

Gets the next cluster value from the FAT table

in

DX = current cluster number

out

DX = new cluster number

destroyed

ES AX BX CX

LoadCluster

Loads a FAT cluster to RAM

in

DX = clusternumber
FS = segment to load to

out

none

destroyed

ES AX BX CX SI DI

LoadSector

Loads a sector (linear) from floppy to RAM

in

DX = sectornumber
FS = segment to address

out

none

destroyed

ES AX BX CX SI DI

InitTextPos

Prepares the screen for addressing

InitA20

Enables A20 gate

InitA20test

Sets carry if A20 is enabled

InitGDT

Builds the bootstrap GDT

InitMemMap

builds the memory map of this computer

Todo’s

try alternative methods than E820

MOS

The exokernel documentation

_PDCLIB_config.h

_PDCLIB_config.h

_PDCLIB_wstdio.h

wcstoimax(), wcstoumax()

Information & Design

bootloaders.txt

stage1. asm [ia_pc]

stage2_ia_pc.asm

stage3. asm [ia-pc]

stage1_ia32_pc.asm

stage2_ia32_pc.asm

stage3_ia32_pc.asm

stage4_ia32_pc.asm

ati_defregs.asm

elf-runtime.asm

elf-test-fb.bas

channeltest.bas

is this the correct way?

mach64_clockdsp.bas

remoteprobe.bas

udi_cmos_props.asm

udi_ramdisk_props.asm

mach64_core.bas

mach64_engine.bas

mach64_socket.bas

trio64_blit.bas

trio64_core.bas

trio64_engine.bas

trio64_socket.bas

gfx_textmode.bas

create something sensible here

idlemit_udidef.c

idlemit_udirx.c

idlemit_uditx.c

elf-runtime.asm

test-runtime-syscall.asm

simplesched.bas

sys_kbdumper.bas

allocateiobitmap.asm

allocateirbitmap.asm

allocatepagetable.asm

blockallocex.asm

blockallocexl.asm

blockallocphys.asm

blockallocphysl.asm

blockdealloc.asm

createthreadremote.asm

kernelversion.asm

managememoryl1.asm

managememoryl2.asm

setredirectbits.asm

transferpage.asm

createvtask.asm

gettimerticks.asm

ipccdeclconv.asm

kernelversion.asm

localipccall.asm

$$divI, $$divoI

strtox_prelim.c

allocpagescall.asm

allocpagescall.asm

keyvaluepair.bas

linkedlistitem.bas

libfb_sys_exec.c

libfb_sys_getshorpath.c

libfb_file_putback.c

libfb_file_putback_wstr.c

libfb_init_nullstring.c

Add query of system default

fb_RtExit() will be called from static/ libfb_ctor.c

fb_RtInit() will be called from static/ libfb_ctor.c

if encoding != ASCII, putback buffer will be in

if encoding != ASCII, putback buffer will be in

if exponent letter is d|D, and

libfb_dev_file_eof.c

query system default

query system default

standardize the DEV_* structs, or provide a device hook function to get OS handle

Unicode support

with a different stack allocation strategy, this

Add query of system default

Add support for non-x86

can’t compare just the address because object or type could be declared in a DLL

can’t tell difference if /bin/ sh returned 127

DJGPP info on 3rd arg of spawnv* functions is inconsistent;

Figure out which Unixy systems have/ don’t have PTHREAD_MUTEX_RECURSIVE[_NP]

handle scrolling for internal characters/ attributes buffer?

handle scrolling for internal characters/ attributes buffer?

if encoding != ASCII, putback buffer will be in

if encoding != ASCII, putback buffer will be in

if exponent letter is d|D, and

io_serial_dos.c

localtime() can return NULL due to weird value from time()

localtime() can return NULL due to weird value from time()

localtime() may return NULL, as documented on MSDN and Linux man pages,

No need to test for input keys because sleep will be hooked

query system default

query system default

SPC is only allowed when using LFNs provided by a Windows

standardize the DEV_* structs, or provide a device hook function to get OS handle

they must be static, or shared libraries in Linux would reuse the

Use default COM properties by default

use NtSetSystemTime

use NtSetSystemTime

user-allocated zstrings are assumed to be large enough

We need to find a method to set a flag whenver a NEW character

with a different stack allocation strategy, this

won’t be able to tell the difference if the exec’ed program returned 255.

Add query of system default

Add support for non-x86

can’t compare just the address because object or type could be declared in a DLL

if encoding != ASCII, putback buffer will be in

if encoding != ASCII, putback buffer will be in

if exponent letter is d|D, and

localtime() can return NULL due to weird value from time()

localtime() can return NULL due to weird value from time()

localtime() may return NULL, as documented on MSDN and Linux man pages,

No need to test for input keys because sleep will be hooked

query system default

query system default

standardize the DEV_* structs, or provide a device hook function to get OS handle

user-allocated zstrings are assumed to be large enough

with a different stack allocation strategy, this

libfb_time_decodeserdate.c

libfb_time_week.c

libfb_time_weekdayname.c

fs_client_ids.h

fs_provider_ids.h

fsdriver_ids.bi

gfx_client_ids.h

gfx_client_ids.h

Architecture-specific

Kernel-specific

_PDCLIB_config.h

inc_syscall.asm

_PDCLIB_config.h

inc_syscall.asm

glloadidentity.c

glmaxtrixmode.c

glmaxtrixmode.c

gltexsubimage2d.c

mglgetconnector.c

mglsetconnector.c

glxbindbuffer.c

glxclearcolor.c

glxmatrixmode.c

glxtexsubimage2d.c

glxtexsubimage2d.c

mglswapbuffer.c

fillbuffer_bgr15.c

fillbuffer_bgr16.c

fillbuffer_bgr24.c

fillbuffer_i8.c

fillbuffer_rgb16.c

fillbuffer_rgb16.c

fillbuffer_rgb16.c

fillbuffer_rgb24.c

trigoraud_mmx.asm

writebuffer_bgr15.c

writebuffer_bgr16.c

writebuffer_bgr24.c

writebuffer_bgra32.c

writebuffer_bgra32.c

writebuffer_i8.c

writebuffer_rgb16.c

writebuffer_rgb24.c

channel_close.c

channel_event_complete.c

decode_block.bas

decode_fs_provider.c

gio_event_res_unused.c

gio_unbind_ack.c

enumerate_ack.c

final_cleanup_ack.c

bus_unbind_req.c

dma_constraints_free.c

intr_attach_ack_unused.c

intr_detach_ack_unused.c

copyframebuffer.c

copylinearoffset.c

really esp - local (not: ebp - local)???

stage3. asm [ia-common]

stage4_load.asm

stage4_test.asm

stage2_8_ia_efi.asm

stage3. asm [ia-pc]