Move api_examples to examples/api

Also add a rule to remove demo.bin which was previously leftover
after a "make clean"

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

7 files changed, 1042 insertions, 0 deletions

diff --git a/examples/api/.gitignore b/examples/api/.gitignore
new file mode 100644
index 0000000..d7b18dc
--- /dev/null
+++ b/examples/api/.gitignore
@@ -0,0 +1,2 @@
+demo
+demo.bin
diff --git a/examples/api/Makefile b/examples/api/Makefile
new file mode 100644
index 0000000..2d05a01
--- /dev/null
+++ b/examples/api/Makefile
@@ -0,0 +1,90 @@
+#
+# (C) Copyright 2007 Semihalf
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundatio; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+ifeq ($(ARCH),ppc)
+LOAD_ADDR = 0x40000
+endif
+ifeq ($(ARCH),arm)
+LOAD_ADDR = 0x1000000
+endif
+
+include $(TOPDIR)/config.mk
+
+# Resulting ELF and binary exectuables will be named demo and demo.bin
+OUTPUT-$(CONFIG_API) = $(obj)demo
+OUTPUT = $(OUTPUT-y)
+
+# Source files located in the examples/api directory
+SOBJ_FILES-$(CONFIG_API) += crt0.o
+COBJ_FILES-$(CONFIG_API) += demo.o
+COBJ_FILES-$(CONFIG_API) += glue.o
+COBJ_FILES-$(CONFIG_API) += libgenwrap.o
+
+# Source files which exist outside the examples/api directory
+EXT_COBJ_FILES-$(CONFIG_API) += lib_generic/crc32.o
+EXT_COBJ_FILES-$(CONFIG_API) += lib_generic/ctype.o
+EXT_COBJ_FILES-$(CONFIG_API) += lib_generic/string.o
+EXT_COBJ_FILES-$(CONFIG_API) += lib_generic/vsprintf.o
+ifeq ($(ARCH),ppc)
+EXT_SOBJ_FILES-$(CONFIG_API) += lib_ppc/ppcstring.o
+endif
+
+# Create a list of source files so their dependencies can be auto-generated
+SRCS	+= $(addprefix $(SRCTREE)/,$(EXT_COBJ_FILES-y:.o=.c))
+SRCS	+= $(addprefix $(SRCTREE)/,$(EXT_SOBJ_FILES-y:.o=.S))
+SRCS	+= $(addprefix $(SRCTREE)/examples/api/,$(COBJ_FILES-y:.o=.c))
+SRCS	+= $(addprefix $(SRCTREE)/examples/api/,$(SOBJ_FILES-y:.o=.S))
+
+# Create a list of object files to be compiled
+OBJS	+= $(addprefix $(obj),$(SOBJ_FILES-y))
+OBJS	+= $(addprefix $(obj),$(COBJ_FILES-y))
+OBJS	+= $(addprefix $(obj),$(notdir $(EXT_COBJ_FILES-y)))
+OBJS	+= $(addprefix $(obj),$(notdir $(EXT_SOBJ_FILES-y)))
+
+gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
+
+CPPFLAGS += -I..
+
+all:	$(obj).depend $(OUTPUT)
+
+#########################################################################
+
+$(OUTPUT):	$(OBJS)
+		$(LD) -Ttext $(LOAD_ADDR) -o $@ $^ -L$(gcclibdir) -lgcc
+		$(OBJCOPY) -O binary $@ $(OUTPUT).bin 2>/dev/null
+
+# Rule to build generic library C files
+$(obj)%.o: $(SRCTREE)/lib_generic/%.c
+	$(CC) -g $(CFLAGS) -c -o $@ $<
+
+# Rule to build architecture-specific library assembly files
+$(obj)%.o: $(SRCTREE)/lib_$(ARCH)/%.S
+	$(CC) -g $(CFLAGS) -c -o $@ $<
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/examples/api/crt0.S b/examples/api/crt0.S
new file mode 100644
index 0000000..6daf127
--- /dev/null
+++ b/examples/api/crt0.S
@@ -0,0 +1,71 @@
+/*
+ * (C) Copyright 2007 Semihalf
+ *
+ * Written by: Rafal Jaworowski <raj@semihalf.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#if defined(CONFIG_PPC)
+
+	.text
+	.globl _start
+_start:
+	lis	%r11, search_hint@ha
+	addi	%r11, %r11, search_hint@l
+	stw	%r1, 0(%r11)
+	b	main
+
+
+	.globl syscall
+syscall:
+	lis	%r11, syscall_ptr@ha
+	addi	%r11, %r11, syscall_ptr@l
+	lwz	%r11, 0(%r11)
+	mtctr	%r11
+	bctr
+
+#elif defined(CONFIG_ARM)
+
+	.text
+	.globl _start
+_start:
+	ldr	ip, =search_hint
+	str	sp, [ip]
+	b	main
+
+
+	.globl syscall
+syscall:
+	ldr	ip, =syscall_ptr
+	ldr	pc, [ip]
+
+#else
+#error No support for this arch!
+#endif
+
+	.globl syscall_ptr
+syscall_ptr:
+	.align	4
+	.long	0
+
+	.globl search_hint
+search_hint:
+	.long   0
diff --git a/examples/api/demo.c b/examples/api/demo.c
new file mode 100644
index 0000000..df9c4bd
--- /dev/null
+++ b/examples/api/demo.c
@@ -0,0 +1,300 @@
+/*
+ * (C) Copyright 2007-2008 Semihalf
+ *
+ * Written by: Rafal Jaworowski <raj@semihalf.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <api_public.h>
+
+#include "glue.h"
+
+#define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
+
+#define BUF_SZ		2048
+#define WAIT_SECS	5
+
+void	test_dump_buf(void *, int);
+void	test_dump_di(int);
+void	test_dump_si(struct sys_info *);
+void	test_dump_sig(struct api_signature *);
+
+static char buf[BUF_SZ];
+
+int main(int argc, char *argv[])
+{
+	int rv = 0, h, i, j, devs_no;
+	struct api_signature *sig = NULL;
+	ulong start, now;
+	struct device_info *di;
+	lbasize_t rlen;
+
+	if (!api_search_sig(&sig))
+		return -1;
+
+	syscall_ptr = sig->syscall;
+	if (syscall_ptr == NULL)
+		return -2;
+
+	if (sig->version > API_SIG_VERSION)
+		return -3;
+
+	printf("API signature found @%x\n", (unsigned int)sig);
+	test_dump_sig(sig);
+
+	printf("\n*** Consumer API test ***\n");
+	printf("syscall ptr 0x%08x@%08x\n", (unsigned int)syscall_ptr,
+		(unsigned int)&syscall_ptr);
+
+	/* console activities */
+	ub_putc('B');
+
+	printf("*** Press any key to continue ***\n");
+	printf("got char 0x%x\n", ub_getc());
+
+	/* system info */
+	test_dump_si(ub_get_sys_info());
+
+	/* timing */
+	printf("\n*** Timing - wait a couple of secs ***\n");
+	start = ub_get_timer(0);
+	printf("\ntime: start %lu\n\n", start);
+	for (i = 0; i < WAIT_SECS; i++)
+		for (j = 0; j < 1000; j++)
+			ub_udelay(1000);	/* wait 1 ms */
+
+	/* this is the number of milliseconds that passed from ub_get_timer(0) */
+	now = ub_get_timer(start);
+	printf("\ntime: now %lu\n\n", now);
+
+	/* enumerate devices */
+	printf("\n*** Enumerate devices ***\n");
+	devs_no = ub_dev_enum();
+
+	printf("Number of devices found: %d\n", devs_no);
+	if (devs_no == 0)
+		return -1;
+
+	printf("\n*** Show devices ***\n");
+	for (i = 0; i < devs_no; i++) {
+		test_dump_di(i);
+		printf("\n");
+	}
+
+	printf("\n*** Operations on devices ***\n");
+
+	/* test opening a device already opened */
+	h = 0;
+	if ((rv = ub_dev_open(h)) != 0) {
+		errf("open device %d error %d\n", h, rv);
+		return -1;
+	}
+	if ((rv = ub_dev_open(h)) != 0)
+		errf("open device %d error %d\n", h, rv);
+
+	ub_dev_close(h);
+
+	/* test storage */
+	printf("Trying storage devices...\n");
+	for (i = 0; i < devs_no; i++) {
+		di = ub_dev_get(i);
+
+		if (di->type & DEV_TYP_STOR)
+			break;
+
+	}
+	if (i == devs_no)
+		printf("No storage devices available\n");
+	else {
+		memset(buf, 0, BUF_SZ);
+
+		if ((rv = ub_dev_open(i)) != 0)
+			errf("open device %d error %d\n", i, rv);
+
+		else if ((rv = ub_dev_read(i, buf, 1, 0, &rlen)) != 0)
+			errf("could not read from device %d, error %d\n", i, rv);
+		else {
+			printf("Sector 0 dump (512B):\n");
+			test_dump_buf(buf, 512);
+		}
+
+		ub_dev_close(i);
+	}
+
+	/* test networking */
+	printf("Trying network devices...\n");
+	for (i = 0; i < devs_no; i++) {
+		di = ub_dev_get(i);
+
+		if (di->type == DEV_TYP_NET)
+			break;
+
+	}
+	if (i == devs_no)
+		printf("No network devices available\n");
+	else {
+		if ((rv = ub_dev_open(i)) != 0)
+			errf("open device %d error %d\n", i, rv);
+		else if ((rv = ub_dev_send(i, &buf, 2048)) != 0)
+			errf("could not send to device %d, error %d\n", i, rv);
+
+		ub_dev_close(i);
+	}
+
+	if (ub_dev_close(h) != 0)
+		errf("could not close device %d\n", h);
+
+	printf("\n*** Env vars ***\n");
+
+	printf("ethact = %s\n", ub_env_get("ethact"));
+	printf("old fileaddr = %s\n", ub_env_get("fileaddr"));
+	ub_env_set("fileaddr", "deadbeef");
+	printf("new fileaddr = %s\n", ub_env_get("fileaddr"));
+
+	const char *env = NULL;
+
+	while ((env = ub_env_enum(env)) != NULL)
+		printf("%s = %s\n", env, ub_env_get(env));
+
+	/* reset */
+	printf("\n*** Resetting board ***\n");
+	ub_reset();
+	printf("\nHmm, reset returned...?!\n");
+
+	return rv;
+}
+
+void test_dump_sig(struct api_signature *sig)
+{
+	printf("signature:\n");
+	printf("  version\t= %d\n", sig->version);
+	printf("  checksum\t= 0x%08x\n", sig->checksum);
+	printf("  sc entry\t= 0x%08x\n", (unsigned int)sig->syscall);
+}
+
+void test_dump_si(struct sys_info *si)
+{
+	int i;
+
+	printf("sys info:\n");
+	printf("  clkbus\t= 0x%08x\n", (unsigned int)si->clk_bus);
+	printf("  clkcpu\t= 0x%08x\n", (unsigned int)si->clk_cpu);
+	printf("  bar\t\t= 0x%08x\n", (unsigned int)si->bar);
+
+	printf("---\n");
+	for (i = 0; i < si->mr_no; i++) {
+		if (si->mr[i].flags == 0)
+			break;
+
+		printf("  start\t= 0x%08lx\n", si->mr[i].start);
+		printf("  size\t= 0x%08lx\n", si->mr[i].size);
+
+		switch(si->mr[i].flags & 0x000F) {
+			case MR_ATTR_FLASH:
+				printf("  type FLASH\n");
+				break;
+			case MR_ATTR_DRAM:
+				printf("  type DRAM\n");
+				break;
+			case MR_ATTR_SRAM:
+				printf("  type SRAM\n");
+				break;
+			default:
+				printf("  type UNKNOWN\n");
+		}
+		printf("---\n");
+	}
+}
+
+static char *test_stor_typ(int type)
+{
+	if (type & DT_STOR_IDE)
+		return "IDE";
+
+	if (type & DT_STOR_MMC)
+		return "MMC";
+
+	if (type & DT_STOR_SATA)
+		return "SATA";
+
+	if (type & DT_STOR_SCSI)
+		return "SCSI";
+
+	if (type & DT_STOR_USB)
+		return "USB";
+
+	return "Unknown";
+}
+
+void test_dump_buf(void *buf, int len)
+{
+	int i;
+	int line_counter = 0;
+	int sep_flag = 0;
+	int addr = 0;
+
+	printf("%07x:\t", addr);
+
+	for (i = 0; i < len; i++) {
+		if (line_counter++ > 15) {
+			line_counter = 0;
+			sep_flag = 0;
+			addr += 16;
+			i--;
+			printf("\n%07x:\t", addr);
+			continue;
+		}
+
+		if (sep_flag++ > 1) {
+			sep_flag = 1;
+			printf(" ");
+		}
+
+		printf("%02x", *((char *)buf++));
+	}
+
+	printf("\n");
+}
+
+void test_dump_di(int handle)
+{
+	int i;
+	struct device_info *di = ub_dev_get(handle);
+
+	printf("device info (%d):\n", handle);
+	printf("  cookie\t= 0x%08x\n", (uint32_t)di->cookie);
+	printf("  type\t\t= 0x%08x\n", di->type);
+
+	if (di->type == DEV_TYP_NET) {
+		printf("  hwaddr\t= ");
+		for (i = 0; i < 6; i++)
+			printf("%02x ", di->di_net.hwaddr[i]);
+
+		printf("\n");
+
+	} else if (di->type & DEV_TYP_STOR) {
+		printf("  type\t\t= %s\n", test_stor_typ(di->type));
+		printf("  blk size\t\t= %d\n", (unsigned int)di->di_stor.block_size);
+		printf("  blk count\t\t= %d\n", (unsigned int)di->di_stor.block_count);
+	}
+}
diff --git a/examples/api/glue.c b/examples/api/glue.c
new file mode 100644
index 0000000..eff6a7e
--- /dev/null
+++ b/examples/api/glue.c
@@ -0,0 +1,404 @@
+/*
+ * (C) Copyright 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <api_public.h>
+
+#include "glue.h"
+
+static int valid_sig(struct api_signature *sig)
+{
+	uint32_t checksum;
+	struct api_signature s;
+
+	if (sig == NULL)
+		return 0;
+	/*
+	 * Clear the checksum field (in the local copy) so as to calculate the
+	 * CRC with the same initial contents as at the time when the sig was
+	 * produced
+	 */
+	s = *sig;
+	s.checksum = 0;
+
+	checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature));
+
+	if (checksum != sig->checksum)
+		return 0;
+
+	return 1;
+}
+
+/*
+ * Searches for the U-Boot API signature
+ *
+ * returns 1/0 depending on found/not found result
+ */
+int api_search_sig(struct api_signature **sig)
+{
+	unsigned char *sp;
+	uint32_t search_start = 0;
+	uint32_t search_end = 0;
+
+	if (sig == NULL)
+		return 0;
+
+	if (search_hint == 0)
+		search_hint = 255 * 1024 * 1024;
+
+	search_start = search_hint & ~0x000fffff;
+	search_end = search_start + API_SEARCH_LEN - API_SIG_MAGLEN;
+
+	sp = (unsigned char *)search_start;
+	while ((sp + API_SIG_MAGLEN) < (unsigned char *)search_end) {
+		if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
+			*sig = (struct api_signature *)sp;
+			if (valid_sig(*sig))
+				return 1;
+		}
+		sp += API_SIG_MAGLEN;
+	}
+
+	*sig = NULL;
+	return 0;
+}
+
+/****************************************
+ *
+ * console
+ *
+ ****************************************/
+
+int ub_getc(void)
+{
+	int c;
+
+	if (!syscall(API_GETC, NULL, (uint32_t)&c))
+		return -1;
+
+	return c;
+}
+
+int ub_tstc(void)
+{
+	int t;
+
+	if (!syscall(API_TSTC, NULL, (uint32_t)&t))
+		return -1;
+
+	return t;
+}
+
+void ub_putc(char c)
+{
+	syscall(API_PUTC, NULL, (uint32_t)&c);
+}
+
+void ub_puts(const char *s)
+{
+	syscall(API_PUTS, NULL, (uint32_t)s);
+}
+
+/****************************************
+ *
+ * system
+ *
+ ****************************************/
+
+void ub_reset(void)
+{
+	syscall(API_RESET, NULL);
+}
+
+static struct mem_region mr[UB_MAX_MR];
+static struct sys_info si;
+
+struct sys_info * ub_get_sys_info(void)
+{
+	int err = 0;
+
+	memset(&si, 0, sizeof(struct sys_info));
+	si.mr = mr;
+	si.mr_no = UB_MAX_MR;
+	memset(&mr, 0, sizeof(mr));
+
+	if (!syscall(API_GET_SYS_INFO, &err, (u_int32_t)&si))
+		return NULL;
+
+	return ((err) ? NULL : &si);
+}
+
+/****************************************
+ *
+ * timing
+ *
+ ****************************************/
+
+void ub_udelay(unsigned long usec)
+{
+	syscall(API_UDELAY, NULL, &usec);
+}
+
+unsigned long ub_get_timer(unsigned long base)
+{
+	unsigned long cur;
+
+	if (!syscall(API_GET_TIMER, NULL, &cur, &base))
+		return 0;
+
+	return cur;
+}
+
+
+/****************************************************************************
+ *
+ * devices
+ *
+ * Devices are identified by handles: numbers 0, 1, 2, ..., UB_MAX_DEV-1
+ *
+ ***************************************************************************/
+
+static struct device_info devices[UB_MAX_DEV];
+
+struct device_info * ub_dev_get(int i)
+{
+	return ((i < 0 || i >= UB_MAX_DEV) ? NULL : &devices[i]);
+}
+
+/*
+ * Enumerates the devices: fills out device_info elements in the devices[]
+ * array.
+ *
+ * returns:		number of devices found
+ */
+int ub_dev_enum(void)
+{
+	struct device_info *di;
+	int n = 0;
+
+	memset(&devices, 0, sizeof(struct device_info) * UB_MAX_DEV);
+	di = &devices[0];
+
+	if (!syscall(API_DEV_ENUM, NULL, di))
+		return 0;
+
+	while (di->cookie != NULL) {
+
+		if (++n >= UB_MAX_DEV)
+			break;
+
+		/* take another device_info */
+		di++;
+
+		/* pass on the previous cookie */
+		di->cookie = devices[n - 1].cookie;
+
+		if (!syscall(API_DEV_ENUM, NULL, di))
+			return 0;
+	}
+
+	return n;
+}
+
+/*
+ * handle:	0-based id of the device
+ *
+ * returns:	0 when OK, err otherwise
+ */
+int ub_dev_open(int handle)
+{
+	struct device_info *di;
+	int err = 0;
+
+	if (handle < 0 || handle >= UB_MAX_DEV)
+		return API_EINVAL;
+
+	di = &devices[handle];
+
+	if (!syscall(API_DEV_OPEN, &err, di))
+		return -1;
+
+	return err;
+}
+
+int ub_dev_close(int handle)
+{
+	struct device_info *di;
+
+	if (handle < 0 || handle >= UB_MAX_DEV)
+		return API_EINVAL;
+
+	di = &devices[handle];
+	if (!syscall(API_DEV_CLOSE, NULL, di))
+		return -1;
+
+	return 0;
+}
+
+/*
+ *
+ * Validates device for read/write, it has to:
+ *
+ * - have sane handle
+ * - be opened
+ *
+ * returns:	0/1 accordingly
+ */
+static int dev_valid(int handle)
+{
+	if (handle < 0 || handle >= UB_MAX_DEV)
+		return 0;
+
+	if (devices[handle].state != DEV_STA_OPEN)
+		return 0;
+
+	return 1;
+}
+
+static int dev_stor_valid(int handle)
+{
+	if (!dev_valid(handle))
+		return 0;
+
+	if (!(devices[handle].type & DEV_TYP_STOR))
+		return 0;
+
+	return 1;
+}
+
+int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start,
+		lbasize_t *rlen)
+{
+	struct device_info *di;
+	lbasize_t act_len;
+	int err = 0;
+
+	if (!dev_stor_valid(handle))
+		return API_ENODEV;
+
+	di = &devices[handle];
+	if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len))
+		return API_ESYSC;
+
+	if (!err && rlen)
+		*rlen = act_len;
+
+	return err;
+}
+
+static int dev_net_valid(int handle)
+{
+	if (!dev_valid(handle))
+		return 0;
+
+	if (devices[handle].type != DEV_TYP_NET)
+		return 0;
+
+	return 1;
+}
+
+int ub_dev_recv(int handle, void *buf, int len, int *rlen)
+{
+	struct device_info *di;
+	int err = 0, act_len;
+
+	if (!dev_net_valid(handle))
+		return API_ENODEV;
+
+	di = &devices[handle];
+	if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len))
+		return API_ESYSC;
+
+	if (!err && rlen)
+		*rlen = act_len;
+
+	 return (err);
+}
+
+int ub_dev_send(int handle, void *buf, int len)
+{
+	struct device_info *di;
+	int err = 0;
+
+	if (!dev_net_valid(handle))
+		return API_ENODEV;
+
+	di = &devices[handle];
+	if (!syscall(API_DEV_WRITE, &err, di, buf, &len))
+		return API_ESYSC;
+
+	return err;
+}
+
+/****************************************
+ *
+ * env vars
+ *
+ ****************************************/
+
+char * ub_env_get(const char *name)
+{
+	char *value;
+
+	if (!syscall(API_ENV_GET, NULL, (uint32_t)name, (uint32_t)&value))
+		return NULL;
+
+	return value;
+}
+
+void ub_env_set(const char *name, char *value)
+{
+	syscall(API_ENV_SET, NULL, (uint32_t)name, (uint32_t)value);
+}
+
+static char env_name[256];
+
+const char * ub_env_enum(const char *last)
+{
+	const char *env, *str;
+	int i;
+
+	env = NULL;
+
+	/*
+	 * It's OK to pass only the name piece as last (and not the whole
+	 * 'name=val' string), since the API_ENUM_ENV call uses envmatch()
+	 * internally, which handles such case
+	 */
+	if (!syscall(API_ENV_ENUM, NULL, (uint32_t)last, (uint32_t)&env))
+		return NULL;
+
+	if (!env)
+		/* no more env. variables to enumerate */
+		return NULL;
+
+	/* next enumerated env var */
+	memset(env_name, 0, 256);
+	for (i = 0, str = env; *str != '=' && *str != '\0';)
+		env_name[i++] = *str++;
+
+	env_name[i] = '\0';
+
+	return env_name;
+}
diff --git a/examples/api/glue.h b/examples/api/glue.h
new file mode 100644
index 0000000..6bf47d0
--- /dev/null
+++ b/examples/api/glue.h
@@ -0,0 +1,80 @@
+/*
+ * (C) Copyright 2007 Semihalf
+ *
+ * Written by: Rafal Jaworowski <raj@semihalf.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/*
+ * This is the header file for conveniency wrapper routines (API glue)
+ */
+
+#ifndef _API_GLUE_H_
+#define _API_GLUE_H_
+
+#define API_SEARCH_LEN		(3 * 1024 * 1024)	/* 3MB search range */
+
+#define UB_MAX_MR	5	/* max mem regions number */
+#define UB_MAX_DEV	6	/* max devices number */
+
+extern void *syscall_ptr;
+extern uint32_t search_hint;
+
+int	syscall(int, int *, ...);
+int	api_search_sig(struct api_signature **sig);
+
+/*
+ * The ub_ library calls are part of the application, not U-Boot code!  They
+ * are front-end wrappers that are used by the consumer application: they
+ * prepare arguments for particular syscall and jump to the low level
+ * syscall()
+ */
+
+/* console */
+int	ub_getc(void);
+int	ub_tstc(void);
+void	ub_putc(char c);
+void	ub_puts(const char *s);
+
+/* system */
+void			ub_reset(void);
+struct sys_info *	ub_get_sys_info(void);
+
+/* time */
+void		ub_udelay(unsigned long);
+unsigned long	ub_get_timer(unsigned long);
+
+/* env vars */
+char *		ub_env_get(const char *name);
+void		ub_env_set(const char *name, char *value);
+const char *	ub_env_enum(const char *last);
+
+/* devices */
+int			ub_dev_enum(void);
+int			ub_dev_open(int handle);
+int			ub_dev_close(int handle);
+int			ub_dev_read(int handle, void *buf, lbasize_t len,
+				lbastart_t start, lbasize_t *rlen);
+int			ub_dev_send(int handle, void *buf, int len);
+int			ub_dev_recv(int handle, void *buf, int len, int *rlen);
+struct device_info *	ub_dev_get(int);
+
+#endif /* _API_GLUE_H_ */
diff --git a/examples/api/libgenwrap.c b/examples/api/libgenwrap.c
new file mode 100644
index 0000000..2b62bad
--- /dev/null
+++ b/examples/api/libgenwrap.c
@@ -0,0 +1,95 @@
+/*
+ * (C) Copyright 2007 Semihalf
+ *
+ * Written by: Rafal Jaworowski <raj@semihalf.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ *
+ * This is is a set of wrappers/stubs that allow to use certain routines from
+ * U-Boot's lib_generic in the standalone app. This way way we can re-use
+ * existing code e.g. operations on strings and similar.
+ *
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <api_public.h>
+
+#include "glue.h"
+
+/*
+ * printf() and vprintf() are stolen from u-boot/common/console.c
+ */
+void printf (const char *fmt, ...)
+{
+	va_list args;
+	uint i;
+	char printbuffer[256];
+
+	va_start (args, fmt);
+
+	/* For this to work, printbuffer must be larger than
+	 * anything we ever want to print.
+	 */
+	i = vsprintf (printbuffer, fmt, args);
+	va_end (args);
+
+	/* Print the string */
+	ub_puts (printbuffer);
+}
+
+void vprintf (const char *fmt, va_list args)
+{
+	uint i;
+	char printbuffer[256];
+
+	/* For this to work, printbuffer must be larger than
+	 * anything we ever want to print.
+	 */
+	i = vsprintf (printbuffer, fmt, args);
+
+	/* Print the string */
+	ub_puts (printbuffer);
+}
+
+void putc (const char c)
+{
+	ub_putc(c);
+}
+
+void udelay(unsigned long usec)
+{
+	ub_udelay(usec);
+}
+
+void do_reset (void)
+{
+	ub_reset();
+}
+
+void *malloc (size_t len)
+{
+	return NULL;
+}
+
+void hang (void)
+{
+	while (1) ;
+}