Diff: Cortex-M3/Privilege_mode/privilege.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Cortex-M3/Privilege_mode/privilege.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,283 @@
+/***********************************************************************//**
+ * @file		privilege.c
+ * @purpose		This example used to test privilege feature of Cortex-M3
+ * 				processor.
+ * @version		1.0
+ * @date		18. June. 2010
+ * @author		NXP MCU SW Application Team
+ *---------------------------------------------------------------------
+ * Software that is described herein is for illustrative purposes only
+ * which provides customers with programming information regarding the
+ * products. This software is supplied "AS IS" without any warranties.
+ * NXP Semiconductors assumes no responsibility or liability for the
+ * use of the software, conveys no license or title under any patent,
+ * copyright, or mask work right to the product. NXP Semiconductors
+ * reserves the right to make changes in the software without
+ * notification. NXP Semiconductors also make no representation or
+ * warranty that such application will be suitable for the specified
+ * use without further testing or modification.
+ **********************************************************************/
+#include "lpc17xx_libcfg.h"
+#include "debug_frmwrk.h"
+#include "lpc17xx_gpio.h"
+
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup Cortex_M3_Privilege_mode	Privilege_mode
+ * @ingroup Cortex_M3_Examples
+ * @{
+ */
+
+/************************** PRIVATE DEFINTIONS*************************/
+/* Uncomment to chose current using eval board */
+//#define MCB_LPC_1768
+#define IAR_LPC_1768
+
+/* CONTROL register controls the privileged level for software execution
+ * when the processor is in Thread mode
+ */
+#define	THREAD_PRIVILEGED			0
+#define THREAD_UNPRIVILEGED			1
+#define THREAD_PRIVILEDGED_MASK		0xFFFFFFFE
+
+/* Used LED */
+#ifdef MCB_LPC_1768
+#define PRIVILEGE_LED				28 //LED P1.28
+#define PRIVILEGE_LEDPORT			1
+#define UNPRIVILEGE_LED				29 //LED P1.29
+#define UNPRIVILEGE_LEDPORT			1
+#elif defined(IAR_LPC_1768)
+#define PRIVILEGE_LED				25 //LED1: P1.25
+#define PRIVILEGE_LEDPORT			1
+#define UNPRIVILEGE_LED				4	//LED2: P0.4
+#define	UNPRIVILEGE_LEDPORT			0
+#endif
+
+/************************** PRIVATE VARIABLES *************************/
+uint8_t menu[]=
+	"********************************************************************************\n\r"
+	"Hello NXP Semiconductors \n\r"
+	"Privileged demo \n\r"
+	"\t - MCU: LPC17xx \n\r"
+	"\t - Core: ARM CORTEX-M3 \n\r"
+	"\t - Communicate via: UART0 - 115200 bps \n\r"
+	"This example used to test Privileged feature of Cortex-M3 processor\n\r"
+	"********************************************************************************\n\r";
+#ifdef MCB_LPC_1768
+uint8_t menu2[]=
+	"LED1 (P1.28) will be turned on in privilege mode \n\r"
+	"LED2 (P1.29) will be turned on in un-privilege mode\n\r";
+#elif defined (IAR_LPC_1768)
+uint8_t menu2[]=
+	"LED1 (P1.25) will be turned on in privilege mode \n\r"
+	"LED2 (P0.4) will blink in un-privilege mode\n\r";
+#endif
+
+/************************** SYSTEM CALL EXCEPTION *********************/
+#if defined ( __CC_ARM   )
+__ASM void __SVC(void)
+{
+  SVC 0x01
+  BX R14
+}
+#elif defined ( __ICCARM__ )
+static __INLINE  void __SVC()                     { __ASM ("svc 0x01");}
+#elif defined   (  __GNUC__  )
+static __INLINE void __SVC()                      { __ASM volatile ("svc 0x01");}
+#endif
+/************************** PRIVATE FUNCTIONS *************************/
+/*********************************************************************//**
+  * @brief  SVC Hander
+  * @param  None
+  * @retval None
+ **********************************************************************/
+void SVC_Handler(void)
+{
+  /* Change Thread mode to privileged */
+  __set_CONTROL(2);
+}
+
+/************************** PRIVATE FUNCTIONS *************************/
+void LED_Init(void);
+void Turn_on_LED(uint8_t Led_num);
+void Turn_off_LED(uint8_t Led_num);
+
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief		Initialize LED
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void LED_Init(void)
+{
+	//setting two LEDs as output and turn off all
+	GPIO_SetDir(PRIVILEGE_LEDPORT,(1<<PRIVILEGE_LED),1);
+	GPIO_SetDir(UNPRIVILEGE_LEDPORT,(1<<UNPRIVILEGE_LED),1);
+#ifdef MCB_LPC_1768
+	GPIO_ClearValue(1,(1<<PRIVILEGE_LED)|(1<<UNPRIVILEGE_LED));
+	GPIO_ClearValue(2,(1<<2)|(1<<3)|(1<<4)|(1<<5)|(1<<6));
+#elif defined(IAR_LPC_1768)
+	GPIO_SetValue(PRIVILEGE_LEDPORT,(1<<PRIVILEGE_LED));
+	GPIO_SetValue(UNPRIVILEGE_LEDPORT,(1<<UNPRIVILEGE_LED));
+#endif
+}
+
+/*********************************************************************//**
+ * @brief		Turn on LED
+ * @param[in]	Led_num		LED number, should be:
+ * 				- PRIVILEGE_LED
+ * 				- UNPRIVILEGE_LED
+ * @return 		None
+ **********************************************************************/
+void Turn_on_LED(uint8_t Led_num)
+{
+#ifdef MCB_LPC_1768
+	if(Led_num == PRIVILEGE_LED){
+		GPIO_SetValue(PRIVILEGE_LEDPORT,(1<<PRIVILEGE_LED));}
+	else{
+		GPIO_SetValue(UNPRIVILEGE_LEDPORT,(1<<UNPRIVILEGE_LED));
+	}
+#elif defined(IAR_LPC_1768)
+	if(Led_num == PRIVILEGE_LED){
+		GPIO_ClearValue(PRIVILEGE_LEDPORT,(1<<PRIVILEGE_LED));}
+	else{
+		GPIO_ClearValue(UNPRIVILEGE_LEDPORT,(1<<UNPRIVILEGE_LED));
+	}
+#endif
+}
+
+/*********************************************************************//**
+ * @brief		Turn off LED
+ * @param[in]	Led_num		LED number, should be:
+ * 				- PRIVILEGE_LED
+ * 				- UNPRIVILEGE_LED
+ * @return 		None
+ **********************************************************************/
+void Turn_off_LED(uint8_t Led_num)
+{
+#ifdef MCB_LPC_1768
+	if(Led_num == PRIVILEGE_LED){
+		GPIO_ClearValue(PRIVILEGE_LEDPORT,(1<<PRIVILEGE_LED));}
+	else{
+		GPIO_ClearValue(UNPRIVILEGE_LEDPORT,(1<<UNPRIVILEGE_LED));
+	}
+#elif defined(IAR_LPC_1768)
+	if(Led_num == PRIVILEGE_LED){
+		GPIO_SetValue(PRIVILEGE_LEDPORT,(1<<PRIVILEGE_LED));}
+	else{
+		GPIO_SetValue(UNPRIVILEGE_LEDPORT,(1<<UNPRIVILEGE_LED));
+	}
+#endif
+}
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: main function
+ * @param[in]	none
+ * @return 		int
+ **********************************************************************/
+int c_entry(void)			/* Main Program */
+{
+	uint32_t priviledge_status;
+	/* Initialize debug via UART0
+	 * – 115200bps
+	 * – 8 data bit
+	 * – No parity
+	 * – 1 stop bit
+	 * – No flow control
+	 */
+	debug_frmwrk_init();
+	LED_Init();
+	//print menu
+	_DBG(menu);
+	_DBG_(menu2);
+
+	/* Thread mode is privilege out of reset */
+	/* First checking Thread mode is privilege or un-privilege */
+	priviledge_status = __get_CONTROL();
+	if((priviledge_status & (~THREAD_PRIVILEDGED_MASK))==THREAD_PRIVILEGED)
+	{
+		_DBG_("Thread mode is privileged!");
+		Turn_on_LED(PRIVILEGE_LED);
+	}
+	else
+	{
+		_DBG_("Theard mode is unprivileged! It's not compliant with Cortex-M3 Technical");
+		while(1); //Error loop
+	}
+	/* Wait user press '1' character to change to un-privilege mode */
+	_DBG_("Press '1' to change to unprivilege mode ...\n\r");
+	while(_DG !='1');
+
+	/* Changing to un-privilege mode */
+	__set_CONTROL((priviledge_status & THREAD_PRIVILEDGED_MASK)|THREAD_UNPRIVILEGED);
+	_DBG_("Changed to unprivilege mode!");
+
+	/* Check */
+	priviledge_status = __get_CONTROL();
+	if((priviledge_status & ~THREAD_PRIVILEDGED_MASK)==THREAD_UNPRIVILEGED)
+	{
+		_DBG_("Check: Thread mode change to unprivilege successful!");
+		Turn_off_LED(PRIVILEGE_LED);
+		Turn_on_LED(UNPRIVILEGE_LED);
+	}
+	else
+	{
+		_DBG_("Check: Thread mode is still privileged! ERROR...");
+		while(1); //Error loop
+	}
+	/* Wait user press '1' character to change to un-privilege mode */
+	_DBG_("Press '2' to change to privilege mode by calling system call exception...\n\r");
+	while(_DG !='2');
+	/* Call system call exception to re-change Thread mode into privilege */
+	__SVC();
+	_DBG_("Called system call exception!");
+
+	/* Check */
+	priviledge_status = __get_CONTROL();
+	if((priviledge_status & ~THREAD_PRIVILEDGED_MASK)==THREAD_PRIVILEGED)
+	{
+		_DBG_("Check: Thread mode change to privilege successful!");
+		Turn_off_LED(UNPRIVILEGE_LED);
+		Turn_on_LED(PRIVILEGE_LED);
+	}
+	else
+	{
+		_DBG_("Check: Theard mode is still unprivileged! ERROR...");
+		while(1); //Error loop
+	}
+	_DBG_("Demo terminate!");
+	while (1);
+	return 0;
+}
+
+/* With ARM and GHS toolsets, the entry point is main() - this will
+ allow the linker to generate wrapper code to setup stacks, allocate
+ heap area, and initialize and copy code and data segments. For GNU
+ toolsets, the entry point is through __start() in the crt0_gnu.asm
+ file, and that startup code will setup stacks and data */
+int main(void) {
+	return c_entry();
+}
+
+#ifdef  DEBUG
+/*******************************************************************************
+ * @brief		Reports the name of the source file and the source line number
+ * 				where the CHECK_PARAM error has occurred.
+ * @param[in]	file Pointer to the source file name
+ * @param[in]    line assert_param error line source number
+ * @return		None
+ *******************************************************************************/
+void check_failed(uint8_t *file, uint32_t line) {
+	/* User can add his own implementation to report the file name and line number,
+	 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+	/* Infinite loop */
+	while (1)
+		;
+}
+#endif
+
+/*
+ * @}
+ */