#define KERN_PROC_P_H
#include "cfg/cfg_proc.h"
-#include "cfg/cfg_signal.h"
#include "cfg/cfg_monitor.h"
#include <cfg/compiler.h>
#include <cpu/types.h> /* for cpu_stack_t */
#include <cpu/irq.h> // IRQ_ASSERT_DISABLED()
-#include <struct/list.h>
+#include <kern/proc.h> // struct Process
-#if CONFIG_KERN_PREEMPT
- #include <ucontext.h> // XXX
-#endif
-
-typedef struct Process
-{
-#if CONFIG_KERN_PRI
- PriNode link; /**< Link Process into scheduler lists */
-#else
- Node link; /**< Link Process into scheduler lists */
-#endif
- cpu_stack_t *stack; /**< Per-process SP */
- iptr_t user_data; /**< Custom data passed to the process */
-
-#if CONFIG_KERN_SIGNALS
- sigmask_t sig_wait; /**< Signals the process is waiting for */
- sigmask_t sig_recv; /**< Received signals */
-#endif
-
-#if CONFIG_KERN_HEAP
- uint16_t flags; /**< Flags */
-#endif
-
-#if CONFIG_KERN_HEAP | CONFIG_KERN_MONITOR | (ARCH & ARCH_EMUL)
- cpu_stack_t *stack_base; /**< Base of process stack */
- size_t stack_size; /**< Size of process stack */
-#endif
-
-#if CONFIG_KERN_PREEMPT
- ucontext_t context;
-#endif
+/*
+ * Check if the process context switch can be performed directly by the
+ * architecture-dependent asm_switch_context() or if it must be delayed
+ * because we're in the middle of an ISR.
+ *
+ * Return true if asm_switch_context() can be executed, false
+ * otherwise.
+ *
+ * NOTE: if an architecture does not implement IRQ_RUNNING() this function
+ * always returns true.
+ */
+#define CONTEXT_SWITCH_FROM_ISR() (!IRQ_RUNNING())
-#if CONFIG_KERN_MONITOR
- struct ProcMonitor
- {
- Node link;
- const char *name;
- } monitor;
+#ifndef asm_switch_context
+/**
+ * CPU dependent context switching routines.
+ *
+ * Saving and restoring the context on the stack is done by a CPU-dependent
+ * support routine which usually needs to be written in assembly.
+ */
+EXTERN_C void asm_switch_context(cpu_stack_t **new_sp, cpu_stack_t **save_sp);
#endif
-} Process;
-
+/*
+ * Save context of old process and switch to new process.
+ */
+INLINE void proc_switchTo(Process *next, Process *prev)
+{
+ cpu_stack_t *dummy;
+
+ if (UNLIKELY(next == prev))
+ return;
+ /*
+ * If there is no old process, we save the old stack pointer into a
+ * dummy variable that we ignore. In fact, this happens only when the
+ * old process has just exited.
+ */
+ asm_switch_context(&next->stack, prev ? &prev->stack : &dummy);
+}
/**
* \name Flags for Process.flags.
/** Track running processes. */
-extern REGISTER Process *CurrentProcess;
+extern REGISTER Process *current_process;
/**
* Track ready processes.
*
* Access to this list must be performed with interrupts disabled
*/
-extern REGISTER List ProcReadyList;
+extern REGISTER List proc_ready_list;
#if CONFIG_KERN_PRI
- #define SCHED_ENQUEUE_INTERNAL(proc) LIST_ENQUEUE(&ProcReadyList, &(proc)->link)
+ #define prio_next() (LIST_EMPTY(&proc_ready_list) ? INT_MIN : \
+ ((PriNode *)LIST_HEAD(&proc_ready_list))->pri)
+ #define prio_proc(proc) (proc->link.pri)
+ #define prio_curr() prio_proc(current_process)
+
+ #define SCHED_ENQUEUE_INTERNAL(proc) \
+ LIST_ENQUEUE(&proc_ready_list, &(proc)->link)
+ #define SCHED_ENQUEUE_HEAD_INTERNAL(proc) \
+ LIST_ENQUEUE_HEAD(&proc_ready_list, &(proc)->link)
#else
- #define SCHED_ENQUEUE_INTERNAL(proc) ADDTAIL(&ProcReadyList, &(proc)->link)
+ #define prio_next() 0
+ #define prio_proc(proc) 0
+ #define prio_curr() 0
+
+ #define SCHED_ENQUEUE_INTERNAL(proc) ADDTAIL(&proc_ready_list, &(proc)->link)
+ #define SCHED_ENQUEUE_HEAD_INTERNAL(proc) ADDHEAD(&proc_ready_list, &(proc)->link)
#endif
/**
*/
#define SCHED_ENQUEUE(proc) do { \
IRQ_ASSERT_DISABLED(); \
- LIST_ASSERT_VALID(&ProcReadyList); \
+ LIST_ASSERT_VALID(&proc_ready_list); \
SCHED_ENQUEUE_INTERNAL(proc); \
} while (0)
+#define SCHED_ENQUEUE_HEAD(proc) do { \
+ IRQ_ASSERT_DISABLED(); \
+ LIST_ASSERT_VALID(&proc_ready_list); \
+ SCHED_ENQUEUE_HEAD_INTERNAL(proc); \
+ } while (0)
+
+
#if CONFIG_KERN_PRI
/**
* Changes the priority of an already enqueued process.
INLINE void sched_reenqueue(struct Process *proc)
{
IRQ_ASSERT_DISABLED();
- LIST_ASSERT_VALID(&ProcReadyList);
+ LIST_ASSERT_VALID(&proc_ready_list);
Node *n;
PriNode *pos = NULL;
- FOREACH_NODE(n, &ProcReadyList)
+ FOREACH_NODE(n, &proc_ready_list)
{
if (n == &proc->link.link)
{
if (pos)
{
REMOVE(&proc->link.link);
- LIST_ENQUEUE(&ProcReadyList, &proc->link);
+ LIST_ENQUEUE(&proc_ready_list, &proc->link);
}
}
#endif //CONFIG_KERN_PRI
-/// Schedule another process *without* adding the current one to the ready list.
+/* Process trampoline */
+void proc_entry(void);
+
+/* Schedule another process *without* adding the current one to the ready list. */
void proc_switch(void);
-#if CONFIG_KERN_PREEMPT
-void proc_entry(void (*user_entry)(void));
-void preempt_init(void);
-#endif
+/* Low level scheduling routine. */
+void proc_schedule(void);
+
+/* Low level context switch routine. */
+void proc_switchTo(Process *next, Process *prev);
+
+/* Initialize a scheduler class. */
+void proc_schedInit(void);
#if CONFIG_KERN_MONITOR
/** Initialize the monitor */
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