api_examples/glue.c - filogic/uboot - Gitiles

 /*
  * (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
  *
  */

 #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);
 }

 #define MR_MAX 5
 static struct mem_region mr[MR_MAX];
 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 = MR_MAX;
 	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, ..., MAX_DEVS-1
  *
  ***************************************************************************/

 #define MAX_DEVS 6

 static struct device_info devices[MAX_DEVS];

 struct device_info * ub_dev_get(int i)
 {
 	return ((i < 0 || i >= MAX_DEVS) ? 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) * MAX_DEVS);
 	di = &devices[0];

 	if (!syscall(API_DEV_ENUM, NULL, di))
 		return 0;

 	while (di->cookie != NULL) {

 		if (++n >= MAX_DEVS)
 			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 >= MAX_DEVS)
 		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 >= MAX_DEVS)
 		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 >= MAX_DEVS)
 		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)
 {
 	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 -1;

 	if (err)
 		return err;

 	if (act_len != len)
 		return API_EIO;

 	return 0;
 }

 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)
 {
 	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 -1;

 	if (err)
 		return -1;

 	return act_len;
 }

 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 -1;

 	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;
 }
	/*
	* (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
	*
	*/

	#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);
	}

	#define MR_MAX 5
	static struct mem_region mr[MR_MAX];
	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 = MR_MAX;
	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, ..., MAX_DEVS-1
	*
	***************************************************************************/

	#define MAX_DEVS 6

	static struct device_info devices[MAX_DEVS];

	struct device_info * ub_dev_get(int i)
	{
	return ((i < 0 \|\| i >= MAX_DEVS) ? 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) * MAX_DEVS);
	di = &devices[0];

	if (!syscall(API_DEV_ENUM, NULL, di))
	return 0;

	while (di->cookie != NULL) {

	if (++n >= MAX_DEVS)
	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 >= MAX_DEVS)
	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 >= MAX_DEVS)
	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 >= MAX_DEVS)
	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)
	{
	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 -1;

	if (err)
	return err;

	if (act_len != len)
	return API_EIO;

	return 0;
	}

	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)
	{
	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 -1;

	if (err)
	return -1;

	return act_len;
	}

	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 -1;

	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;
	}