mac99: Added FW_CFG_PPC_BUSFREQ to match CLOCKFREQ and TBFREQ already there

While there, also moved the hard coded value for CLOCKFREQ to a #define.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Introduce libdecnumber Code

Add files from the libdecnumber decimal floating point library to QEMU.  The libdecnumber
library was originally part of GCC and contains code that is useful in emulating the PowerPC
decimal floating point (DFP) instructions.  This particular copy of the source comes from
GCC 4.3 and is licensed at GPLv2+.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Eliminate #include *Symbols.h

The various *Symbols.h files were not copied from the original GCC libdecnumber
library; they are not necessary for use in QEMU.  Remove all instances of

    #include "*Symbols.h"

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Prepare libdecnumber for QEMU include structure

Consistent with other libraries in QEMU, the libdecnumber header files were
placed in include/libdecnumber, separate from the C code.  This is different
from the original libdecnumber source, where they were co-located.

Change the libdecnumber source code so that it reflects this split.  Specifically,
modify directives of the form:

    #include "xxx.h"

to look like:

    #include "libdecnumber/xxx.h"

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Modify dconfig.h to Integrate with QEMU

Modify the dconfig.h header file so that libdecnumber code integrates QEMU
configuration.   Specifically:

  - the WORDS_BIGENDIAN preprocessor macro is used in libdecnumber code to
    determines endianness.  It is derived from the existing QEMU macro
    HOST_WORDS_BIGENDIAN which is defined in config-host.h.

  - the DECPUN macro determines the number of decimal digits (aka declets) per
    unit (byte).  This is 3 for PowerPC DFP.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Change gstdint.h to stdint.h

Replace the inclusion of gstdint.h with the standard stdint.h
header file.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Eliminate redundant declarations

Eliminate redundant declarations of symbols DPD2BIN and BIN2DPD in
various .c source files.  These symbols are already declared in decDPD.h and
thus will trigger 'redundant redeclaration of ?XXX?' warnings, which, of
course, may fail QEMU compilation.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Eliminate Unused Variable in decSetSubnormal

Eliminate an unused variable in the decSetSubnormal routine.  The
variable dnexp is declared and eventually set but never used, and
thus may trigger an unused-but-set-variable warning.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Enable Building of libdecnumber

Enable compilation of the newly added libdecnumber library code.
Object file targets are added to Makefile.target using a newly
introduced flag CONFIG_LIBDECNUMBER.  The flag is added
to the PowerPC targets (ppc[64]-linux-user, ppc[64]-softmmu).

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Introduce decNumberFrom[U]Int64

Introduce two conversion functions to the libdecnumber library.
These conversions transform 64 bit integers to the internal decNumber
representation.  Both a signed and unsigned version is added.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Introduce decNumberIntegralToInt64

Introduce a new conversion function to the libdecnumber library.
This function converts a decNumber to a signed 64-bit integer.
In order to support 64-bit integers (which may have up to 19
decimal digits), the existing "powers of 10" array is expanded
from 10 to 19 entries.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
libdecnumber: Fix decNumberSetBCD

Fix a simple bug in the decNumberSetBCD() function.  This function
encodes a decNumber with "n" BCD digits.  The original code erroneously
computed the number of declets from the dn argument, which is the output
decNumber value, and hence may contain garbage.  Instead, the input "n"
value is used.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Define FPR Pointer Type for Helpers

Define a floating pointer register pointer type in the PowerPC
helper header.  The type will be used to pass FPR register operands
to Decimal Floating Point (DFP) helpers.  A pointer is used because
the quad word forms of PowerPC DFP instructions operate on adjacent
pairs of floating point registers and thus can be thought of as
arrays of length 2.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Introduce Generator Macros for DFP Arithmetic Forms

Add general support for generators of PowerPC Decimal Floating Point helpers.

Some utilities are annotated with GCC attribute unused in order to preserve
build bisection.  These annotations will be removed in later patches.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Introduce Decoder Macros for DFP

Add decoder macros for the various Decimal Floating Point
instruction forms.  Illegal instruction masks are used to not only
guard against reserved instruction field use, but also to catch
illegal quad word forms that use odd-numbered floating point registers.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Introduce DFP Helper Utilities

Add a new file (dfp_helper.c) to the PowerPC implementation for Decimal Floating
Point (DFP) emulation.  This first version of the file declares a structure that
will be used by DFP helpers.  It also implements utilities that will initialize
such a structure for either a long (64 bit) DFP instruction or an extended (128
bit, aka "quad") instruction.

Some utility functions are annotated with the unused attribute in order to preserve
build bisection.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Introduce DFP Post Processor Utilities

Add post-processing utilities to the PowerPC Decimal Floating Point
(DFP) helper code.  Post-processors are small routines that execute
after a preliminary DFP result is computed.  They are used, among other
things, to compute status bits.

This change defines a function type for post processors as well as a
generic routine to run a list (array) of post-processors.

Actual post-processor implementations will be added as needed by specific
DFP helpers in subsequent changes.

Some routines are annotated with the GCC unused attribute in order to
preserve build bisection.  The annotation will be removed in subsequent
patches.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Introduce DFP Add

Add emulation of the PowerPC Decimal Floating Point Add instructions dadd[q][.]

Various GCC unused annotations are removed since it is now safe to remove them.

Signed-off-by: Tom Musta <tommusta@gmail.com>
[agraf: move brace in function definition]
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Introduce DFP Subtract

Add emulation of the PowerPC Decimal Floating Point Subtract instructions
dsub[q][.]

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
target-ppc: Introduce DFP Multiply

Add emulation of the PowerPC Decimal Floating Point Multiply instructions
dmul[q][.]

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>