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bertos/cfg/os.h

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2004, 2005 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2008 Bernie Innocenti <bernie@codewiz.org>
+ * -->
+ *
+ * \brief OS-specific definitions
+ *
+ * \author Bernie Innocenti <bernie@codewiz.org>
+ */
+
+#ifndef CFG_OS_H
+#define CFG_OS_H
+
+#include "cfg/cfg_proc.h"
+
+/*
+ * OS autodetection (Some systems trigger multiple OS definitions)
+ */
+#ifdef _WIN32
+	#define OS_WIN32  1
+	#define OS_ID     win32
+
+	// FIXME: Maybe disable Win32 exceptions?
+	typedef int cpu_flags_t;
+	#define IRQ_DISABLE                FIXME
+	#define IRQ_ENABLE                 FIXME
+	#define IRQ_SAVE_DISABLE(old_sigs) FIXME
+	#define IRQ_RESTORE(old_sigs)      FIXME
+
+#else
+	#define OS_WIN32  0
+#endif
+
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
+	#define OS_UNIX   1
+	#define OS_POSIX  1  /* Not strictly UNIX, but no way to autodetect it. */
+	#define OS_ID     posix
+
+	/*
+	 * The POSIX moral equivalent of disabling IRQs is disabling signals.
+	 */
+	#include <signal.h>
+	typedef sigset_t cpu_flags_t;
+
+	#define SET_ALL_SIGNALS(sigs) \
+	do { \
+		sigfillset(&sigs); \
+		sigdelset(&sigs, SIGINT); \
+		sigdelset(&sigs, SIGSTOP); \
+		sigdelset(&sigs, SIGCONT); \
+	} while(0)
+
+	#define IRQ_DISABLE \
+	do { \
+		sigset_t sigs; \
+		SET_ALL_SIGNALS(sigs); \
+		sigprocmask(SIG_BLOCK, &sigs, NULL); \
+	} while (0)
+
+	#define IRQ_ENABLE \
+	do { \
+		sigset_t sigs; \
+		SET_ALL_SIGNALS(sigs); \
+		sigprocmask(SIG_UNBLOCK, &sigs, NULL); \
+	} while (0)
+
+	#define IRQ_SAVE_DISABLE(old_sigs) \
+	do { \
+		sigset_t sigs; \
+		SET_ALL_SIGNALS(sigs); \
+		sigprocmask(SIG_BLOCK, &sigs, &old_sigs); \
+	} while (0)
+
+	#define IRQ_RESTORE(old_sigs) \
+	do { \
+		sigprocmask(SIG_SETMASK, &old_sigs, NULL); \
+	} while (0)
+
+	#define IRQ_ENABLED() \
+	({ \
+		sigset_t sigs__; \
+		sigprocmask(SIG_SETMASK, NULL, &sigs__); \
+		sigismember(&sigs__, SIGALRM) ? false : true; \
+	 })
+
+	#if (CONFIG_KERN && CONFIG_KERN_PREEMPT)
+		#define DECLARE_ISR_CONTEXT_SWITCH(vect)	\
+			void vect(UNUSED_ARG(int, arg));	\
+			INLINE void __isr_##vect(void);		\
+			void vect(UNUSED_ARG(int, arg))		\
+			{					\
+				__isr_##vect();			\
+				IRQ_PREEMPT_HANDLER();		\
+			}					\
+			INLINE void __isr_##vect(void)
+		/**
+		 * With task priorities enabled each ISR is used a point to
+		 * check if we need to perform a context switch.
+		 *
+		 * Instead, without priorities a context switch can occur only
+		 * when the running task expires its time quantum. In this last
+		 * case, the context switch can only occur in the timer ISR,
+		 * that must be always declared with the
+		 * DECLARE_ISR_CONTEXT_SWITCH() macro.
+		 */
+		#if CONFIG_KERN_PRI
+			#define DECLARE_ISR(vect) \
+				DECLARE_ISR_CONTEXT_SWITCH(vect)
+		#endif /* CONFIG_KERN_PRI */
+	#endif
+	#ifndef DECLARE_ISR
+		#define DECLARE_ISR(vect) \
+				void vect(UNUSED_ARG(int, arg))
+	#endif
+	#ifndef DECLARE_ISR_CONTEXT_SWITCH
+		#define DECLARE_ISR_CONTEXT_SWITCH(vect) \
+				void vect(UNUSED_ARG(int, arg))
+	#endif
+
+#else
+	#define OS_UNIX   0
+	#define OS_POSIX  0
+#endif
+
+#ifdef __linux__
+	#define OS_LINUX  1
+#else
+	#define OS_LINUX  0
+#endif
+
+#if defined(__APPLE__) && defined(__MACH__)
+	#define OS_DARWIN 1
+#else
+	#define OS_DARWIN 0
+#endif
+
+
+#include "cfg/cfg_arch.h" /* For ARCH_QT */
+
+/*
+ * We want Qt and other frameworks to look like OSes because you would
+ * tipically want their portable abstractions if you're using one of these.
+ */
+#if defined(_QT) || (defined(ARCH_QT) && (ARCH & ARCH_QT))
+	#define OS_QT 1
+	#undef  OS_ID
+	#define OS_ID qt
+#else
+	#define OS_QT 0
+#endif
+
+/*
+ * Summarize hosted environments as OS_HOSTED and embedded
+ * environment with OS_EMBEDDED.
+ */
+#if OS_WIN32 || OS_UNIX || OS_DARWIN || OS_QT
+	#define OS_HOSTED   1
+	#define OS_EMBEDDED 0
+#else
+	#define OS_HOSTED   0
+	#define OS_EMBEDDED 1
+
+	/* Embedded environments fall back to CPU-specific code. */
+	#define OS_ID       CPU_ID
+#endif
+
+/* Self-check for the detection */
+#if !defined(OS_ID)
+	#error OS_ID not defined
+#endif
+#if OS_HOSTED && OS_EMBEDDED
+	#error Both hosted and embedded OS environment
+#endif
+#if !OS_HOSTED && !OS_EMBEDDED
+	#error Neither hosted nor embedded OS environment
+#endif
+
+#if OS_HOSTED
+
+	/// Macro to include OS-specific headers.
+	#define OS_HEADER(module)  PP_STRINGIZE(emul/PP_CAT3(module, _, OS_ID).h)
+
+	/// Macro to include OS-specific source files.
+	#define OS_CSOURCE(module) PP_STRINGIZE(emul/PP_CAT3(module, _, OS_ID).c)
+
+#else
+	// Fallbacks for embedded systems
+	#define OS_HEADER(module)  CPU_HEADER(module)
+	#define OS_CSOURCE(module) CPU_CSOURCE(module)
+#endif
+
+#endif /* CFG_OS_H */