dde_bsd: add audio drivers ported from OpenBSD

These audio drivers enable support for Intel HD Audio (Azalia) and
Ensoniq AudioPCI (ES1370) compatible soundcards. They are ported
from OpenBSD 5.7.

Fixes #1498.

repos/dde_bsd/lib/mk/audio.inc

@@ -0,0 +1,77 @@
+LIB_DIR     = $(REP_DIR)/src/lib/audio
+LIB_INC_DIR = $(LIB_DIR)/include
+
+AUDIO_CONTRIB_DIR := $(call select_from_ports,dde_bsd)/src/lib/audio
+
+INC_DIR += $(LIB_DIR)
+INC_DIR += $(LIB_INC_DIR)
+INC_DIR += $(AUDIO_CONTRIB_DIR)
+
+SRC_CC += bus.cc dummies.cc driver.cc irq.cc mem.cc misc.cc scheduler.cc timer.cc
+SRC_C += bsd_emul.c
+SRC_S += setjmp.S
+
+CC_OPT += -Wno-unused-but-set-variable
+
+# disable builtins
+CC_OPT += -fno-builtin-printf -fno-builtin-snprintf -fno-builtin-vsnprintf \
+          -fno-builtin-malloc -fno-builtin-free -fno-builtin-log -fno-builtin-log2
+
+CC_OPT += -D_KERNEL
+
+# enable when debugging
+# CC_OPT += -DAUDIO_DEBUG
+# CC_OPT += -DAZALIA_DEBUG
+# CC_OPT += -DDIAGNOSTIC
+
+# audio interface
+SRC_C += dev/audio.c dev/auconv.c
+
+# AC97 codec
+SRC_C += dev/ic/ac97.c
+
+# HDA driver
+SRC_C += dev/pci/azalia.c dev/pci/azalia_codec.c
+
+# ES1370
+SRC_C += dev/pci/eap.c
+
+SRC_C += dev/mulaw.c
+
+#
+# Determine the header files included by the contrib code. For each
+# of these header files we create a symlink to 'bsd_emul.h'.
+#
+GEN_INCLUDES := $(shell grep -rh "^\#include .*" $(AUDIO_CONTRIB_DIR) |\
+                        sed "s/^\#include [^<\"]*[<\"]\([^>\"]*\)[>\"].*/\1/" | sort | uniq)
+
+#
+# Filter out original BSD headers that exist in the contrib directory
+#
+NO_GEN_INCLUDES := $(shell cd $(AUDIO_CONTRIB_DIR); find -name "*.h" | sed "s/.\///" | sed "s/.*include\///")
+GEN_INCLUDES    := $(filter-out $(NO_GEN_INCLUDES),$(GEN_INCLUDES))
+
+#
+# Put BSD headers in 'GEN_INC' dir
+#
+GEN_INC := $(shell pwd)/include
+
+$(shell mkdir -p $(GEN_INC))
+
+GEN_INCLUDES    := $(addprefix $(GEN_INC)/,$(GEN_INCLUDES))
+INC_DIR         += $(GEN_INC)
+
+#
+# Make sure to create the header symlinks prior building
+#
+$(SRC_C:.c=.o) $(SRC_CC:.cc=.o): $(GEN_INCLUDES)
+
+$(GEN_INCLUDES):
+	$(VERBOSE)mkdir -p $(dir $@)
+	$(VERBOSE)ln -s $(LIB_INC_DIR)/bsd_emul.h $@
+
+vpath %.c  $(AUDIO_CONTRIB_DIR)
+vpath %.c  $(LIB_DIR)
+vpath %.cc $(LIB_DIR)
+
+# vi: set ft=make :

repos/dde_bsd/lib/mk/x86_32/audio.mk

@@ -0,0 +1,5 @@
+INC_DIR += $(LIB_INC_DIR)/x86_32 $(LIB_INC_DIR)/x86
+
+include $(REP_DIR)/lib/mk/audio.inc
+
+vpath %.S $(LIB_DIR)/x86_32

repos/dde_bsd/lib/mk/x86_64/audio.mk

@@ -0,0 +1,5 @@
+INC_DIR += $(LIB_INC_DIR)/x86_64 $(LIB_INC_DIR)/x86
+
+include $(REP_DIR)/lib/mk/audio.inc
+
+vpath %.S $(LIB_DIR)/x86_64