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/*
****************************************************************************
* (C) 2005 - Grzegorz Milos - Intel Research Cambridge
****************************************************************************
*
* File: sched.c
* Author: Grzegorz Milos
* Changes: Robert Kaiser
*
* Date: Aug 2005
*
* Environment: Xen Minimal OS
* Description: simple scheduler for Mini-Os
*
* The scheduler is non-preemptive (cooperative), and schedules according
* to Round Robin algorithm.
*
****************************************************************************
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <mini-os/os.h>
#include <mini-os/hypervisor.h>
#include <mini-os/time.h>
#include <mini-os/mm.h>
#include <mini-os/types.h>
#include <mini-os/lib.h>
#include <mini-os/xmalloc.h>
#include <mini-os/list.h>
#include <mini-os/sched.h>
#include <mini-os/semaphore.h>
#ifdef SCHED_DEBUG
#define DEBUG(_f, _a...) \
printk("MINI_OS(file=sched.c, line=%d) " _f "\n", __LINE__, ## _a)
#else
#define DEBUG(_f, _a...) ((void)0)
#endif
void dump_stack(struct thread *thread)
{
unsigned long *bottom = (unsigned long *)(thread->stack + STACK_SIZE);
unsigned long *pointer = (unsigned long *)thread->sp;
int count;
if(thread == current)
{
#ifdef __i386__
asm("movl %%esp,%0"
: "=r"(pointer));
#else
asm("movq %%rsp,%0"
: "=r"(pointer));
#endif
}
printk("The stack for \"%s\"\n", thread->name);
for(count = 0; count < 25 && pointer < bottom; count ++)
{
printk("[0x%lx] 0x%lx\n", pointer, *pointer);
pointer++;
}
if(pointer < bottom) printk(" ... continues.\n");
}
/* Gets run when a new thread is scheduled the first time ever,
defined in x86_[32/64].S */
extern void thread_starter(void);
/* Pushes the specified value onto the stack of the specified thread */
static void stack_push(struct thread *thread, unsigned long value)
{
thread->sp -= sizeof(unsigned long);
*((unsigned long *)thread->sp) = value;
}
/* Architecture specific setup of thread creation */
struct thread* arch_create_thread(char *name, void (*function)(void *),
void *data)
{
struct thread *thread;
thread = xmalloc(struct thread);
/* We can't use lazy allocation here since the trap handler runs on the stack */
thread->stack = (char *)alloc_pages(STACK_SIZE_PAGE_ORDER);
thread->name = name;
printk("Thread \"%s\": pointer: 0x%lx, stack: 0x%lx\n", name, thread,
thread->stack);
thread->sp = (unsigned long)thread->stack + STACK_SIZE;
/* Save pointer to the thread on the stack, used by current macro */
*((unsigned long *)thread->stack) = (unsigned long)thread;
stack_push(thread, (unsigned long) function);
stack_push(thread, (unsigned long) data);
thread->ip = (unsigned long) thread_starter;
return thread;
}
void run_idle_thread(void)
{
/* Switch stacks and run the thread */
#if defined(__i386__)
__asm__ __volatile__("mov %0,%%esp\n\t"
"push %1\n\t"
"ret"
:"=m" (idle_thread->sp)
:"m" (idle_thread->ip));
#elif defined(__x86_64__)
__asm__ __volatile__("mov %0,%%rsp\n\t"
"push %1\n\t"
"ret"
:"=m" (idle_thread->sp)
:"m" (idle_thread->ip));
#endif
}
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