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Implement cpu_set_upcall and cpu_set_upcall_kse.

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Reviewed by: peter
This commit is contained in:
David Xu 2003-07-24 08:52:44 +00:00
parent 81ebc68226
commit c3f8e34d6b
1 changed files with 68 additions and 0 deletions
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68
sys/amd64/amd64/vm_machdep.c
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@ -221,6 +221,51 @@ cpu_thread_setup(struct thread *td)
void
cpu_set_upcall(struct thread *td, struct thread *td0)
{
struct pcb *pcb2;
/* Point the pcb to the top of the stack. */
pcb2 = td->td_pcb;
/*
* Copy the upcall pcb. This loads kernel regs.
* Those not loaded individually below get their default
* values here.
*
* XXXKSE It might be a good idea to simply skip this as
* the values of the other registers may be unimportant.
* This would remove any requirement for knowing the KSE
* at this time (see the matching comment below for
* more analysis) (need a good safe default).
*/
bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
/*
* Create a new fresh stack for the new thread.
* Don't forget to set this stack value into whatever supplies
* the address for the fault handlers.
* The contexts are filled in at the time we actually DO the
* upcall as only then do we know which KSE we got.
*/
bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
/*
* Set registers for trampoline to user mode. Leave space for the
* return address on stack. These are the kernel mode register values.
*/
pcb2->pcb_cr3 = vtophys(vmspace_pmap(td->td_proc->p_vmspace)->pm_pml4);
pcb2->pcb_r12 = (register_t)fork_return; /* trampoline arg */
pcb2->pcb_rbp = 0;
pcb2->pcb_rsp = (register_t)td->td_frame - sizeof(void *); /* trampoline arg */
pcb2->pcb_rbx = (register_t)td; /* trampoline arg */
pcb2->pcb_rip = (register_t)fork_trampoline;
pcb2->pcb_rflags = td->td_frame->tf_rflags & ~PSL_I; /* ints disabled */
/*
* If we didn't copy the pcb, we'd need to do the following registers:
* pcb2->pcb_savefpu: cloned above.
* pcb2->pcb_rflags: cloned above.
* pcb2->pcb_onfault: cloned above (always NULL here?).
* pcb2->pcb_[fg]sbase: cloned above
*/
}
/*
@ -231,6 +276,29 @@ cpu_set_upcall(struct thread *td, struct thread *td0)
void
cpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku)
{
/*
* Do any extra cleaning that needs to be done.
* The thread may have optional components
* that are not present in a fresh thread.
* This may be a recycled thread so make it look
* as though it's newly allocated.
*/
cpu_thread_clean(td);
/*
* Set the trap frame to point at the beginning of the uts
* function.
*/
td->td_frame->tf_rsp =
((register_t)ku->ku_stack.ss_sp + ku->ku_stack.ss_size) & ~0x0f;
td->td_frame->tf_rip = (register_t)ku->ku_func;
/*
* Pass the address of the mailbox for this kse to the uts
* function as a parameter on the stack.
*/
td->td_frame->tf_rdi = (register_t)ku->ku_mailbox;
}