Overhaul xxboot. And merge floppy boot, taken from boot_ustar.
- Rewrite boot.S completely.
boot.S now supports boot from SCSI HD/CD and floppy.
- Use IOCS call to identify the floppy format, instead of chkfmt.s which
accesses hardware directly.
- Import print_hex() debug function from boot_ufs.
- Import a feature that displays initial registers (for debug) from boot_ufs,
and restore it (this in boot_ufs has been broken).
- Add size optimized alternatives for some libkern routines.
- Stop linking libsa to prevent to link unexpected objects.
- Bump version to 2.0.

Set heap area explicitly.
Until the load address was moved, the heap was placed at _end (it's default)
and it was large space. After moving, this default space was too small.

Revert placing .bss right after .data, and make .bss fixed at 0x5000.
.bss placed right after .data was overwritten when first 1KB loads full
.text+.data.

Use __bss_start rather than edata to point the beginning of .bss.
Currently the .bss is placed right after .data. In that case, edata
points to the beginning of .bss so that there is no visible changes at
least currently.

Change primary bootloader's load address from 0x0f0000 to 0x003000.
- Moving addresses closer eliminates bunch of this linker errors:
in function `entry0':
relocation truncated to fit: R_68K_16 against `edata'+ffffffffffff8000
:
- By this change, harmful -noinhibit-exec option can also be removed.
Finally, we can break the builds when assemble error occurs!
- Load address of secondary is 0x6000, so that this change limits
text+data+bss 12KB or less. Current actual size is 5~7KB.
I think it should be fine.
- cd9660 can have up to 30KB text+data in its bootarea. Even in this
case, this change limits text+data+bss 12KB or less (currently, it's
about 6KB). However, I take breaking the builds on errors rather than
future size limitation.
There is no user visible changes or interface changes.

Typo in comment. s/availble/available/

Add comment and figure of address map.

Initialize the screen in all primary bootloaders.
- Some IPL (or boot selector) don't do it, but current secondary bootloader
expects the screen to be initialized to display logo.
To keep messages (like version signature) displayed by primary bootloader,
this initialization should be done early in all primary bootloaders.
- For boot_ustar.S, relocates some registers to save bootinfo (%d0).
- Bumps version.

Confirmed on X68030+060turbo and my X68030. This problem was found on
X68030+060turbo at NetBSD booth in OSC 2011 Hiroshima (8+ years ago).

Use .org directive to fix disklabel location instead of hand calculation.
If the code size before disklabel is less, zero is filled automatically.
If the code size before disklabel is exceeded, assembler stops with error.
Note that this changes a padding word in the current output binary from
a NOP instruction to zero but there are no functional changes.

Typo in comment. s/LABELLOFFSET/LABELOFFSET/

branches: 1.3.2; 1.3.40; 1.3.46;
Use a correct function name in .globl decl.

Pull fixes in comments from x68k/stand/boot_ufs/boot.S rev 1.9 and 1.10.

branches: 1.1.2; 1.1.4;
Initial support for xxboot (cdboot_cd9660, specifically).

Set heap area explicitly.
Until the load address was moved, the heap was placed at _end (it's default)
and it was large space. After moving, this default space was too small.

Revert placing .bss right after .data, and make .bss fixed at 0x5000.
.bss placed right after .data was overwritten when first 1KB loads full
.text+.data.

Use __bss_start rather than edata to point the beginning of .bss.
Currently the .bss is placed right after .data. In that case, edata
points to the beginning of .bss so that there is no visible changes at
least currently.

Change primary bootloader's load address from 0x0f0000 to 0x003000.
- Moving addresses closer eliminates bunch of this linker errors:
in function `entry0':
relocation truncated to fit: R_68K_16 against `edata'+ffffffffffff8000
:
- By this change, harmful -noinhibit-exec option can also be removed.
Finally, we can break the builds when assemble error occurs!
- Load address of secondary is 0x6000, so that this change limits
text+data+bss 12KB or less. Current actual size is 5~7KB.
I think it should be fine.
- cd9660 can have up to 30KB text+data in its bootarea. Even in this
case, this change limits text+data+bss 12KB or less (currently, it's
about 6KB). However, I take breaking the builds on errors rather than
future size limitation.
There is no user visible changes or interface changes.

Typo in comment. s/availble/available/

Add comment and figure of address map.

Initialize the screen in all primary bootloaders.
- Some IPL (or boot selector) don't do it, but current secondary bootloader
expects the screen to be initialized to display logo.
To keep messages (like version signature) displayed by primary bootloader,
this initialization should be done early in all primary bootloaders.
- For boot_ustar.S, relocates some registers to save bootinfo (%d0).
- Bumps version.

Confirmed on X68030+060turbo and my X68030. This problem was found on
X68030+060turbo at NetBSD booth in OSC 2011 Hiroshima (8+ years ago).

Use .org directive to fix disklabel location instead of hand calculation.
If the code size before disklabel is less, zero is filled automatically.
If the code size before disklabel is exceeded, assembler stops with error.
Note that this changes a padding word in the current output binary from
a NOP instruction to zero but there are no functional changes.

Typo in comment. s/LABELLOFFSET/LABELOFFSET/

branches: 1.3.2; 1.3.46;
Use a correct function name in .globl decl.

Pull fixes in comments from x68k/stand/boot_ufs/boot.S rev 1.9 and 1.10.

branches: 1.1.2; 1.1.4;
Initial support for xxboot (cdboot_cd9660, specifically).

Change primary bootloader's load address from 0x0f0000 to 0x003000.
- Moving addresses closer eliminates bunch of this linker errors:
in function `entry0':
relocation truncated to fit: R_68K_16 against `edata'+ffffffffffff8000
:
- By this change, harmful -noinhibit-exec option can also be removed.
Finally, we can break the builds when assemble error occurs!
- Load address of secondary is 0x6000, so that this change limits
text+data+bss 12KB or less. Current actual size is 5~7KB.
I think it should be fine.
- cd9660 can have up to 30KB text+data in its bootarea. Even in this
case, this change limits text+data+bss 12KB or less (currently, it's
about 6KB). However, I take breaking the builds on errors rather than
future size limitation.
There is no user visible changes or interface changes.

Typo in comment. s/availble/available/

Add comment and figure of address map.

Initialize the screen in all primary bootloaders.
- Some IPL (or boot selector) don't do it, but current secondary bootloader
expects the screen to be initialized to display logo.
To keep messages (like version signature) displayed by primary bootloader,
this initialization should be done early in all primary bootloaders.
- For boot_ustar.S, relocates some registers to save bootinfo (%d0).
- Bumps version.

Confirmed on X68030+060turbo and my X68030. This problem was found on
X68030+060turbo at NetBSD booth in OSC 2011 Hiroshima (8+ years ago).

Use .org directive to fix disklabel location instead of hand calculation.
If the code size before disklabel is less, zero is filled automatically.
If the code size before disklabel is exceeded, assembler stops with error.
Note that this changes a padding word in the current output binary from
a NOP instruction to zero but there are no functional changes.

Typo in comment. s/LABELLOFFSET/LABELOFFSET/

branches: 1.3.2; 1.3.46;
Use a correct function name in .globl decl.

Pull fixes in comments from x68k/stand/boot_ufs/boot.S rev 1.9 and 1.10.

branches: 1.1.2; 1.1.4;
Initial support for xxboot (cdboot_cd9660, specifically).

Use .org directive to fix disklabel location instead of hand calculation.
If the code size before disklabel is less, zero is filled automatically.
If the code size before disklabel is exceeded, assembler stops with error.
Note that this changes a padding word in the current output binary from
a NOP instruction to zero but there are no functional changes.

Typo in comment. s/LABELLOFFSET/LABELOFFSET/

branches: 1.3.2;
Use a correct function name in .globl decl.

Pull fixes in comments from x68k/stand/boot_ufs/boot.S rev 1.9 and 1.10.

branches: 1.1.2; 1.1.4;
Initial support for xxboot (cdboot_cd9660, specifically).

Typo in comment. s/LABELLOFFSET/LABELOFFSET/

branches: 1.3.2;
Use a correct function name in .globl decl.

Pull fixes in comments from x68k/stand/boot_ufs/boot.S rev 1.9 and 1.10.

branches: 1.1.2; 1.1.4;
Initial support for xxboot (cdboot_cd9660, specifically).