728f0f0c49
* Userspace change to use the new kernel calls - _taskcall(SYSTASK...) changed to _kernel_call(...) - int 32 reused for the kernel calls - _do_kernel_call() to make the trap to kernel - kernel_call() to make the actuall kernel call from C using _do_kernel_call() - unlike ipc call the kernel call always succeeds as kernel is always available, however, kernel may return an error * Kernel side implementation of kernel calls - the SYSTEm task does not run, only the proc table entry is preserved - every data_copy(SYSTEM is no data_copy(KERNEL - "locking" is an empty operation now as everything runs in kernel - sys_task() is replaced by kernel_call() which copies the message into kernel, dispatches the call to its handler and finishes by either copying the results back to userspace (if need be) or by suspending the process because of VM - suspended processes are later made runnable once the memory issue is resolved, picked up by the scheduler and only at this time the call is resumed (in fact restarted) which does not need to copy the message from userspace as the message is already saved in the process structure. - no ned for the vmrestart queue, the scheduler will restart the system calls - no special case in do_vmctl(), all requests remove the RTS_VMREQUEST flag
199 lines
5.5 KiB
C
199 lines
5.5 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_VMCTL
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*
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* The parameters for this kernel call are:
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* SVMCTL_WHO which process
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* SVMCTL_PARAM set this setting (VMCTL_*)
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* SVMCTL_VALUE to this value
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*/
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#include "../system.h"
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#include "../vm.h"
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#include "../debug.h"
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#include <minix/type.h>
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/*===========================================================================*
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* do_vmctl *
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*===========================================================================*/
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PUBLIC int do_vmctl(struct proc * caller, message * m_ptr)
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{
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int proc_nr;
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endpoint_t ep = m_ptr->SVMCTL_WHO;
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struct proc *p, *rp, *target;
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int err;
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if(ep == SELF) { ep = m_ptr->m_source; }
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if(!isokendpt(ep, &proc_nr)) {
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kprintf("do_vmctl: unexpected endpoint %d from VM\n", ep);
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return EINVAL;
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}
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p = proc_addr(proc_nr);
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switch(m_ptr->SVMCTL_PARAM) {
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case VMCTL_CLEAR_PAGEFAULT:
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RTS_LOCK_UNSET(p, RTS_PAGEFAULT);
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return OK;
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case VMCTL_MEMREQ_GET:
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/* Send VM the information about the memory request. */
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if(!(rp = vmrequest))
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return ESRCH;
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vmassert(RTS_ISSET(rp, RTS_VMREQUEST));
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#if 0
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printf("kernel: vm request sent by: %s / %d about %d; 0x%lx-0x%lx, wr %d, stack: %s ",
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rp->p_name, rp->p_endpoint, rp->p_vmrequest.who,
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rp->p_vmrequest.start,
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rp->p_vmrequest.start + rp->p_vmrequest.length,
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rp->p_vmrequest.writeflag, rp->p_vmrequest.stacktrace);
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printf("type %d\n", rp->p_vmrequest.type);
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#endif
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#if DEBUG_VMASSERT
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okendpt(rp->p_vmrequest.who, &proc_nr);
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target = proc_addr(proc_nr);
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#if 0
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if(!RTS_ISSET(target, RTS_VMREQTARGET)) {
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printf("set stack: %s\n", rp->p_vmrequest.stacktrace);
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minix_panic("RTS_VMREQTARGET not set for target",
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NO_NUM);
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}
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#endif
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#endif
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/* Reply with request fields. */
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switch(rp->p_vmrequest.req_type) {
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case VMPTYPE_CHECK:
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m_ptr->SVMCTL_MRG_TARGET =
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rp->p_vmrequest.target;
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m_ptr->SVMCTL_MRG_ADDR =
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rp->p_vmrequest.params.check.start;
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m_ptr->SVMCTL_MRG_LENGTH =
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rp->p_vmrequest.params.check.length;
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m_ptr->SVMCTL_MRG_FLAG =
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rp->p_vmrequest.params.check.writeflag;
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m_ptr->SVMCTL_MRG_REQUESTOR =
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(void *) rp->p_endpoint;
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break;
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case VMPTYPE_COWMAP:
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case VMPTYPE_SMAP:
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case VMPTYPE_SUNMAP:
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m_ptr->SVMCTL_MRG_TARGET =
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rp->p_vmrequest.target;
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m_ptr->SVMCTL_MRG_ADDR =
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rp->p_vmrequest.params.map.vir_d;
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m_ptr->SVMCTL_MRG_EP2 =
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rp->p_vmrequest.params.map.ep_s;
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m_ptr->SVMCTL_MRG_ADDR2 =
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rp->p_vmrequest.params.map.vir_s;
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m_ptr->SVMCTL_MRG_LENGTH =
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rp->p_vmrequest.params.map.length;
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m_ptr->SVMCTL_MRG_FLAG =
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rp->p_vmrequest.params.map.writeflag;
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m_ptr->SVMCTL_MRG_REQUESTOR =
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(void *) rp->p_endpoint;
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break;
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default:
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minix_panic("VMREQUEST wrong type", NO_NUM);
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}
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rp->p_vmrequest.vmresult = VMSUSPEND;
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/* Remove from request chain. */
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vmrequest = vmrequest->p_vmrequest.nextrequestor;
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return rp->p_vmrequest.req_type;
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case VMCTL_MEMREQ_REPLY:
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vmassert(RTS_ISSET(p, RTS_VMREQUEST));
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vmassert(p->p_vmrequest.vmresult == VMSUSPEND);
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okendpt(p->p_vmrequest.target, &proc_nr);
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target = proc_addr(proc_nr);
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p->p_vmrequest.vmresult = m_ptr->SVMCTL_VALUE;
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vmassert(p->p_vmrequest.vmresult != VMSUSPEND);
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#if DEBUG_VMASSERT
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if(p->p_vmrequest.vmresult != OK)
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kprintf("SYSTEM: VM replied %d to mem request\n",
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p->p_vmrequest.vmresult);
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printf("memreq reply: vm request sent by: %s / %d about %d; 0x%lx-0x%lx, wr %d, stack: %s ",
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p->p_name, p->p_endpoint, p->p_vmrequest.who,
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p->p_vmrequest.start,
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p->p_vmrequest.start + p->p_vmrequest.length,
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p->p_vmrequest.writeflag, p->p_vmrequest.stacktrace);
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printf("type %d\n", p->p_vmrequest.type);
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#endif
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vmassert(RTS_ISSET(target, RTS_VMREQTARGET));
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RTS_LOCK_UNSET(target, RTS_VMREQTARGET);
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switch(p->p_vmrequest.type) {
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case VMSTYPE_KERNELCALL:
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/*
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* we will have to resume execution of the kernel call
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* as soon the scheduler picks up this process again
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*/
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p->p_misc_flags |= MF_KCALL_RESUME;
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break;
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case VMSTYPE_DELIVERMSG:
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vmassert(p->p_misc_flags & MF_DELIVERMSG);
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vmassert(p == target);
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vmassert(RTS_ISSET(p, RTS_VMREQUEST));
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break;
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case VMSTYPE_MAP:
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vmassert(RTS_ISSET(p, RTS_VMREQUEST));
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break;
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default:
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#if DEBUG_VMASSERT
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printf("suspended with stack: %s\n",
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p->p_vmrequest.stacktrace);
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#endif
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minix_panic("strange request type",
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p->p_vmrequest.type);
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}
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RTS_LOCK_UNSET(p, RTS_VMREQUEST);
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return OK;
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case VMCTL_ENABLE_PAGING:
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/*
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* system task must not get preempted while switching to paging,
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* interrupt handling is not safe
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*/
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lock;
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if(vm_running)
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minix_panic("do_vmctl: paging already enabled", NO_NUM);
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vm_init(p);
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if(!vm_running)
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minix_panic("do_vmctl: paging enabling failed", NO_NUM);
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vmassert(p->p_delivermsg_lin ==
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umap_local(p, D, p->p_delivermsg_vir, sizeof(message)));
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if ((err = arch_enable_paging()) != OK) {
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unlock;
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return err;
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}
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if(newmap(caller, p, (struct mem_map *) m_ptr->SVMCTL_VALUE) != OK)
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minix_panic("do_vmctl: newmap failed", NO_NUM);
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FIXLINMSG(p);
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vmassert(p->p_delivermsg_lin);
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unlock;
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return OK;
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case VMCTL_KERN_PHYSMAP:
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{
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int i = m_ptr->SVMCTL_VALUE;
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return arch_phys_map(i,
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(phys_bytes *) &m_ptr->SVMCTL_MAP_PHYS_ADDR,
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(phys_bytes *) &m_ptr->SVMCTL_MAP_PHYS_LEN,
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&m_ptr->SVMCTL_MAP_FLAGS);
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}
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case VMCTL_KERN_MAP_REPLY:
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{
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return arch_phys_map_reply(m_ptr->SVMCTL_VALUE,
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(vir_bytes) m_ptr->SVMCTL_MAP_VIR_ADDR);
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}
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}
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/* Try architecture-specific vmctls. */
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return arch_do_vmctl(m_ptr, p);
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}
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