[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH ARM v6 09/14] mini-os: arm: scheduling
Based on an initial patch by Karim Raslan. Signed-off-by: Karim Allah Ahmed <karim.allah.ahmed@xxxxxxxxx> Signed-off-by: Thomas Leonard <talex5@xxxxxxxxx> --- extras/mini-os/arch/arm/arm32.S | 22 ++++++++++++++++++++++ extras/mini-os/arch/arm/sched.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+) create mode 100644 extras/mini-os/arch/arm/sched.c diff --git a/extras/mini-os/arch/arm/arm32.S b/extras/mini-os/arch/arm/arm32.S index 88efe24..56429b1 100644 --- a/extras/mini-os/arch/arm/arm32.S +++ b/extras/mini-os/arch/arm/arm32.S @@ -204,8 +204,30 @@ irq_handler: IRQ_handler: .long 0x0 + +.globl __arch_switch_threads +@ => r0 = &prev->sp +@ r1 = &next->sp +@ <= returns to next thread's saved return address +__arch_switch_threads: + stmia r0, {sp, lr} @ Store current sp and ip to prev's struct thread + str fp, [sp, #-4] @ Store fp on the old stack + + ldmia r1, {sp, lr} @ Load new sp, ip from next's struct thread + ldr fp, [sp, #-4] @ Restore fp from the stack + + mov pc, lr + @ This is called if you try to divide by zero. For now, we make a supervisor call, @ which will make us halt. .globl raise raise: svc 0 + +.globl arm_start_thread +arm_start_thread: + pop {r0, r1} + @ r0 = user data + @ r1 -> thread's main function + ldr lr, =exit_thread + bx r1 diff --git a/extras/mini-os/arch/arm/sched.c b/extras/mini-os/arch/arm/sched.c new file mode 100644 index 0000000..9fb884e --- /dev/null +++ b/extras/mini-os/arch/arm/sched.c @@ -0,0 +1,38 @@ +#include <mini-os/sched.h> +#include <mini-os/xmalloc.h> +#include <mini-os/console.h> + +void arm_start_thread(void); + +/* 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); + + /* Save pointer to the thread on the stack, used by current macro */ + *((unsigned long *)thread->stack) = (unsigned long)thread; + + /* Push the details to pass to arm_start_thread onto the stack */ + int *sp = (int *) (thread->stack + STACK_SIZE); + *(--sp) = (int) function; + *(--sp) = (int) data; + thread->sp = (unsigned long) sp; + + thread->ip = (unsigned long) arm_start_thread; + + return thread; +} + +void run_idle_thread(void) +{ + __asm__ __volatile__ ("mov sp, %0; mov pc, %1"::"r"(idle_thread->sp), "r"(idle_thread->ip)); + /* Never arrive here! */ +} -- 2.0.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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