This patch adds real-mode pci bios callbacks.
It also adds support for a hardcoded $PIR table.
The pci config functions are moved from rombios32.c to pci.c.
Note that protected mode pci-bios calls were not added.
It's more natural to call the detect code from post. It does require
some of the ATA support code be compiled in twice (once in 32bit mode
and once in 16 bit), however that only leads to a small increase in
total C code (~250 bytes).
Using 32bit pointers makes the code a little simpler. It also allows
the code to be used from 32 bit mode. It does require all callers to
encode the segment/offset into an absolute address. The ins/outs
functions also need to know how to convert from 32bit back to
segment/offset addresses.
The change also includes a minor cleanup of the macros in farptr.h.
This fixes an issue with freedos lbacache - the bios was overrunning
the stack on disk requests.
The code has been simplified by extracting common code.
Some handlers moved to inline code to reduce overall stack usage.
Inline alters stack usage, so don't let gcc uninline.
Also, gcc seems to include multiple copies of uninlined functions when
using -combine.
With inlining forced on, the no null check optimization causes
problems, so disable it.
Don't back up all registers on isr handlers - they don't read/modify
them. This saves stack space.
extended_bios_data_area_s must be packed to match ebda spec.
Enable irqs on int 08 - follows old bochs bios code.
Fix bug in int 76 -- should clear disk_interrupt_flag not
floppy_harddisk_info.
Make sure we alert in disk_ret on failure case.
int 18/19 entry points need to setup cld/%ds too.
asm in handle_1587 clobbers flags - note that in clobber list.
Clean up by moving code from handle_15e820 to set_e820_range.
Set ES explicilty prior to populating the map - the code was relying
on nothing changing it.
Calling debug_exit at the end of a call doesn't help much - several of
the registers are already clobbered at this point. It also increases
stack usage because it prevents call tail optimization in many places.
This adds acpi, smbios, pci init, etc.
Changes from original rombios32.c code:
* Header file translation.
* Use common functions already in code (eg, outb, memset, bios_printf,
usleep)
* Implement trampoline for disabling bios shadowing (rombios32 code
actually runs in the 0xf0000 area).
* Copy asm code from rombios32start.S to an asm() statement in C
code.
This patches uses symbols for cmos offsets when calculating ram size
in ram_probe()
Besides, it adds some cmos offset symbols into cmos.h, and changes
some memory cmos offset to be more meaningful.
Signed-off-by: Nguyen Anh Quynh <aquynh@gmail.com>
Kevin O'Connor