delta/syslinux.git/memdisk, branch syslinux-3.84 git.kernel.org: pub/scm/boot/syslinux/syslinux.git memdisk: slight cleanup of the "safe hook" structure 2009-12-07T23:02:14+00:00 H. Peter Anvin hpa@zytor.com 2009-12-07T23:02:14+00:00 6b588d85fe96f91b90035c897c6f015553e0d213 Make the "safe hook" structure code a bit more readable. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
Make the "safe hook" structure code a bit more readable.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
memdisk: "safe hook" and mBFT 2009-12-07T23:00:54+00:00 Shao Miller Shao.Miller@yrdsb.edu.on.ca 2009-12-07T04:03:43+00:00 569a7aa11d6ec9f93fb513fd55287afc785f2d9c Two additions to MEMDISK to support OS drivers. The "safe hook" structure ("Safe Master Boot Record INT 13h Hook Routines") is a means for an OS driver to follow a chain of INT 13h hooks, examining the hooks' vendors and assuming responsibility for hook functionality along the way. For MEMDISK, we guarantee an additional field which holds the physical address for the mBFT. The mBFT is an ACPI table which an OS driver can scan for. The mBFT contains the official MEMDISK Info structure (MDI) which itself includes parameters the OS will want to know about. The mBFT points back at the "safe hook" structure's physical address so that an OS supporting both "safe hook" chain-walking as well as mBFT-scanning can know that both refer to the same MEMDISK instance. Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca> Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
Two additions to MEMDISK to support OS drivers.

The "safe hook" structure ("Safe Master Boot Record INT 13h Hook Routines")
is a means for an OS driver to follow a chain of INT 13h hooks, examining
the hooks' vendors and assuming responsibility for hook functionality along
the way.  For MEMDISK, we guarantee an additional field which holds the
physical address for the mBFT.

The mBFT is an ACPI table which an OS driver can scan for.  The mBFT
contains the official MEMDISK Info structure (MDI) which itself includes
parameters the OS will want to know about.  The mBFT points back at the
"safe hook" structure's physical address so that an OS supporting both
"safe hook" chain-walking as well as mBFT-scanning can know that both
refer to the same MEMDISK instance.

Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
memdisk: pptr->cd_pkt.sect_count is in virtual sectors 2009-11-20T04:17:43+00:00 H. Peter Anvin hpa@zytor.com 2009-11-20T04:17:43+00:00 a0dae108231cdd929aff1f6551fcb70c806c0f99 Per the El Torito spec, pptr->cd_pkt.sect_count are in virtual sectors, i.e. 512-byte sectors. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
Per the El Torito spec, pptr->cd_pkt.sect_count are in virtual
sectors, i.e. 512-byte sectors.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
memdisk: Use boot_lba logic for booting an offset within the disk image 2009-11-20T04:15:07+00:00 Shao Miller shao.miller@yrdsb.edu.on.ca 2009-11-20T01:49:34+00:00 dee8f891599f2497e194e086f6603b00291ce033 We have two fundamental quantities: the offset of the disk image itself and the LBA from which we boot. Keep them straight. This should make at least some no-emulation isos work correctly. Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca> Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
We have two fundamental quantities: the offset of the disk image
itself and the LBA from which we boot.  Keep them straight.  This
should make at least some no-emulation isos work correctly.

Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
memdisk: Restore DL for INT 13h, AH=15h, DL=floppy 2009-11-20T01:54:56+00:00 Shao Miller shao.miller@yrdsb.edu.on.ca 2009-11-20T01:20:33+00:00 a59acfdc096be06d1319ee4010eea8abc7b9824e At least PC-DOS requires this to avoid an infinite loop; the DL we restore is not the same DL that we call the underlying BIOS with, but rather the original one (before the decrement.) PC-DOS loops over all the floppies and relies on the call preserving DL in order to advance the loop. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
At least PC-DOS requires this to avoid an infinite loop; the DL we
restore is not the same DL that we call the underlying BIOS with, but
rather the original one (before the decrement.)  PC-DOS loops over all
the floppies and relies on the call preserving DL in order to advance
the loop.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Merge branch 'memdisk-iso-SAFE' into memdisk-iso 2009-11-16T10:36:06+00:00 Shao Miller shao.miller@yrdsb.edu.on.ca 2009-11-16T10:36:06+00:00 235864576279688ab7e191cdfc9e8533b6d75fe9 Conflicts: memdisk/memdisk_chs.asm memdisk/memdisk_edd.asm memdisk/setup.c Resolved: Deleted memdisk/memdisk_chs.asm Deleted memdisk/memdisk_edd.asm Modified memdisk/setup.c 
Conflicts:

	memdisk/memdisk_chs.asm
	memdisk/memdisk_edd.asm
	memdisk/setup.c

Resolved:

	Deleted memdisk/memdisk_chs.asm
	Deleted memdisk/memdisk_edd.asm
	Modified memdisk/setup.c
MEMDISK: generate map files 2009-08-18T02:06:01+00:00 H. Peter Anvin hpa@zytor.com 2009-08-18T02:06:01+00:00 565c1d8c67289d8df1b16eea1e325d86385d90fb Generate map files to make debugging less painful. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
Generate map files to make debugging less painful.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
memdisk: make the stack size configurable 2009-08-18T00:30:40+00:00 H. Peter Anvin hpa@zytor.com 2009-08-17T02:51:38+00:00 f3b1b1b7d183aaef287c74c397507fc34b355e99 Make it possible to configure the stack size on the command line, so that we can rule that out in case of problems. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 
Make it possible to configure the stack size on the command line,
so that we can rule that out in case of problems.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
[memdisk] Add El Torito emulation for .ISO images 2009-08-04T03:50:20+00:00 Shao Miller shao.miller@yrdsb.edu.on.ca 2009-08-04T01:45:34+00:00 3369a18e1a3eae71a8b37bd91cff61dbbe389a2b With this patch, users can now boot El Torito-bootable .ISO (CD/DVD) images. The user should specify "iso" on the kernel command-line. 
With this patch, users can now boot El Torito-bootable .ISO (CD/DVD) images.
The user should specify "iso" on the kernel command-line.
[memdisk] Add installable INT 13h hooks for ISO-booting scenarios 2009-08-04T02:09:37+00:00 Shao Miller shao.miller@yrdsb.edu.on.ca 2009-08-01T06:06:08+00:00 1275c1535315174f355b4bf74e69e572d8b38fc6 As of this commit, these hooks do nothing special and are unused. They are intended to support the El Torito "No Emulation" (2048-byte sector size) and "Floppy Emulation"/"HDD Emulation" (512-byte sector size) modes for bootable optical disc drive media (CD/DVD). 
As of this commit, these hooks do nothing special and are unused.  They are
intended to support the El Torito "No Emulation" (2048-byte sector size) and
"Floppy Emulation"/"HDD Emulation" (512-byte sector size) modes for bootable
optical disc drive media (CD/DVD).