Michael Brown [Wed, 24 May 2006 09:14:44 +0000 (09:14 +0000)]
Removed REAL_FRAGMENT and REAL_CALL, and left just REAL_EXEC (which is
the only one we actually use). This allows REAL_EXEC fragments to
contain proper references to constraints (e.g. "%w0"), rather than having
to force the use of specific registers.
Note that the "num_constraints" parameter is now completely obsolete, and
that we can probably reduce the syntax to something like
__asm__ __volatile__ ( REAL_CODE ( "asm statements" )
: output constraints
: input constraints
: clobber );
which would look much more natural, and avoid the need to always specify
a clobber list.
Add userptr_t to libkir.h, to allow it to at least compile.
Michael Brown [Tue, 23 May 2006 23:42:45 +0000 (23:42 +0000)]
Add __{text,data}16_array, since there's no way I can see to make the
usual __{text,data}16 trick work with arrays. gcc seems to accept the
__asm__ ( asmlabel ) only after the [] of the array declaration, not
before.
Michael Brown [Tue, 23 May 2006 23:33:37 +0000 (23:33 +0000)]
Cope with regions bigger than 4GB.
We now split e820 regions around ourselves, rather than just
truncating the e820 region. This avoids the worst-case scenario of
losing all memory over 4GB.
It's more important to get the memory map right now that we're
expecting to still be loaded when the OS starts in several situations
(e.g. Linux with UNDI driver, any OS with iSCSI/AoE boot, etc.).
Dan Lynch [Mon, 22 May 2006 17:03:41 +0000 (17:03 +0000)]
- implemented printw (formatted string output, a la printf)
- implemented hline/vline (part of wborder family)
- screen cursor now relocates at same time as window cursor when
restoring after a non-wrapping function
Michael Brown [Fri, 19 May 2006 18:54:38 +0000 (18:54 +0000)]
READ CAPACITY (16) turns out to be an optional command (even though
READ(16) is mandatory); we must use READ CAPACITY (10) first and then
use READ CAPACITY (16) if the READ CAPACITY (10) returns "out of range".
Dan Lynch [Fri, 19 May 2006 16:22:10 +0000 (16:22 +0000)]
- made some of the bit shifting attribute access simpler (in my mind)
- added extern declarations for global vars
- removed comments from static inlines (too time consuming to do them
all, considering all so far have been due to the ridiculous amount of
redundancy within the API spec)
- removed a few more extern func decls for funcs that cannot be
implemented at this time
Dan Lynch [Fri, 19 May 2006 16:18:08 +0000 (16:18 +0000)]
- made _wputch wrap lines as well as cols (wraps back to line 0, as we have not way to scroll...)
- implemented color_content, wborder, wblrtobot, wclrtoeol, wcolor_set and several small functions
- added rest of expected global variables
Michael Brown [Fri, 19 May 2006 15:06:51 +0000 (15:06 +0000)]
Add the concept of a "user pointer" (similar to the void __user * in
the kernel), which encapsulates the information needed to refer to an
external buffer. Under normal operation, this can just be a void *
equivalent, but under -DKEEP_IT_REAL it would be a segoff_t equivalent.
Use this concept to avoid the need for bounce buffers in int13.c,
which reduces memory usage and opens up the possibility of using
multi-sector reads.
Extend the block-device API and the SCSI block device implementation
to support multi-sector reads.
Update iscsi.c to use user buffers.
Move the obsolete portions of realmode.h to old_realmode.h.
MS-DOS now boots an order of magnitude faster over iSCSI (~10 seconds
from power-up to C:> prompt in bochs).
Michael Brown [Wed, 17 May 2006 17:16:24 +0000 (17:16 +0000)]
Split debug functions out into core/debug.c, so that they can be
automatically linked in on demand.
Corrected warnings in misc.c. strtoul() really should be
unsigned long strtoul ( const char *p, const char **endp, int base )
but such is not the ANSI standard.
Michael Brown [Wed, 17 May 2006 01:12:11 +0000 (01:12 +0000)]
Strip down i386 PCI configuration space I/O to the bare minimum. A
typical build will now include 880 bytes of PCI support code, compared to
2327 bytes in Etherboot 5.4.
(There is a slight cost of around 5 extra bytes per access to a
non-constant config space address; this should be an overall win.
Driver-specific accesses will usually be to constant addresses, for
which there is no additional cost.)
Michael Brown [Tue, 16 May 2006 15:12:06 +0000 (15:12 +0000)]
Restructured PCI subsystem to fit the new device model.
Generic PCI code now handles 64-bit BARs correctly when setting
"membase"; drivers should need to call pci_bar_start() only if they want
to use BARs other than the first memory or I/O BAR.
Split rarely-used PCI functions out into pciextra.c.
Core PCI code is now 662 bytes (down from 1308 bytes in Etherboot 5.4).
284 bytes of this saving comes from the pci/pciextra split.
Cosmetic changes to lots of drivers (e.g. vendor_id->vendor in order to
match the names used in Linux).
Michael Brown [Tue, 16 May 2006 15:00:36 +0000 (15:00 +0000)]
Tear out old heap code, replace with code that simply allocates memory
for use by malloc().
This breaks the image-loading code (which previously used the heap to
allocate the buffer for downloading the image), but that's not a major
concern since I'm going to tear out all the image formats within the next
couple of days anyway. Byebye, NBI! :)
Michael Brown [Sun, 14 May 2006 03:31:20 +0000 (03:31 +0000)]
Updated documentation.
Shaved around 100 bytes off vsprintf.o. It's now 50 bytes smaller than
the old implementation and provides much more conformant semantics,
including the ability to return the number of characters that would have
been printed to the string had the buffer been big enough. (iSCSI needs
this functionality).
Michael Brown [Sat, 13 May 2006 11:50:52 +0000 (11:50 +0000)]
At least cope with "%llx" by reading the correct-sized va_arg from the
stack, even if we don't yet print it out.
At some point, vsprintf() needs to be fixed up so that it can correctly
cope with limited-sized buffers (i.e. vsnprintf), long longs, and
standard format specifiers (e.g. "%04x"). We should also remove the
special types (MAC addresses and IP addresses). This would then enable
us to use gcc's ability to type-check printf format strings.
Michael Brown [Sat, 6 May 2006 19:44:23 +0000 (19:44 +0000)]
Preserve the whole of %esp across prot_call(). We have to split this
between the low half stored in the static variable rm_sp, and the high
half stored on the prot_call() stack, because:
Just using the stack would screw up when a prot_call()ed routine
executes a real_call(); it would have no way to find the current top of
the RM stack.
Extending rm_sp to rm_esp would not be safe, because the guarantee that
rm_sp must return to the correct value by the time an external
real-mode call returns applies only to %sp, not to %esp.
Michael Brown [Thu, 4 May 2006 17:00:20 +0000 (17:00 +0000)]
Added methods for efficiently declaring and accessing variables in
.data16. librm will need to supply "char *data16", i.e. the virtual
address of the start of .data16.
Michael Brown [Tue, 2 May 2006 16:38:46 +0000 (16:38 +0000)]
<name>_size variable is no longer needed, since we don't copy the code.
However, it's worth adding a .size directive so that objdump reports the
correct sizes for the code fragments.
Michael Brown [Tue, 2 May 2006 15:41:21 +0000 (15:41 +0000)]
Towards a(nother) new real-mode infrastructure, in which we take
advantage of the fact that we have to have a permanently-resident block
in base memory.
Michael Brown [Mon, 1 May 2006 21:26:44 +0000 (21:26 +0000)]
Checking in because I don't want to lose this rather neat code for
running the decompresser in 16:16 protected mode using the real-mode
stack. However, there's an even simpler way to do it...