refactor: simplify the vmm design, single responsibility. But using it should with...

[lunaix-os.git] / lunaix-os / kernel / sched.c

diff --git a/lunaix-os/kernel/sched.c b/lunaix-os/kernel/sched.c
index 8f65087f8253175f0a2dd2f4f26ab34afd718a4a..a93c9bb5e37a87802df17a761039793bca0cb607 100644 (file)
--- a/lunaix-os/kernel/sched.c
+++ b/lunaix-os/kernel/sched.c
@@ -1,12 +1,15 @@
 #include <arch/x86/interrupts.h>
 #include <arch/x86/tss.h>
+
 #include <hal/apic.h>
 #include <hal/cpu.h>
+
 #include <lunaix/mm/kalloc.h>
+#include <lunaix/mm/pmm.h>
 #include <lunaix/mm/vmm.h>
 #include <lunaix/process.h>
 #include <lunaix/sched.h>
-
+#include <lunaix/signal.h>
 #include <lunaix/spike.h>
 #include <lunaix/status.h>
 #include <lunaix/syscall.h>
@@ -28,9 +31,11 @@ void
 sched_init()
 {
     size_t pg_size = ROUNDUP(sizeof(struct proc_info) * MAX_PROCESS, 0x1000);
-    assert_msg(vmm_alloc_pages(
-                 KERNEL_PID, &__proc_table, pg_size, PG_PREM_RW, PP_FGPERSIST),
-               "Fail to allocate proc table");
+
+    for (size_t i = 0; i <= pg_size; i += 4096) {
+        uintptr_t pa = pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
+        vmm_set_mapping(PD_REFERENCED, &__proc_table + i, pa, PG_PREM_RW);
+    }
 
     sched_ctx = (struct scheduler){ ._procs = (struct proc_info*)&__proc_table,
                                     .ptable_len = 0,
@@ -47,20 +52,10 @@ run(struct proc_info* proc)
 
     // FIXME: 这里还是得再考虑一下。
     // tss_update_esp(__current->intr_ctx.esp);
-
-    if (__current->page_table != proc->page_table) {
-        __current = proc;
-        cpu_lcr3(__current->page_table);
-        // from now on, the we are in the kstack of another process
-    } else {
-        __current = proc;
-    }
-
     apic_done_servicing();
 
     asm volatile("pushl %0\n"
-                 "jmp soft_iret\n" ::"r"(&__current->intr_ctx)
-                 : "memory");
+                 "jmp switch_to\n" ::"r"(proc)); // kernel/asm/x86/interrupt.S
 }
 
 void
@@ -70,6 +65,8 @@ schedule()
         return;
     }
 
+    // 上下文切换相当的敏感！我们不希望任何的中断打乱栈的顺序……
+    cpu_disable_interrupt();
     struct proc_info* next;
     int prev_ptr = sched_ctx.procs_index;
     int ptr = prev_ptr;
@@ -97,6 +94,7 @@ __DEFINE_LXSYSCALL1(unsigned int, sleep, unsigned int, seconds)
     if (!seconds) {
         return 0;
     }
+
     if (__current->timer) {
         return __current->timer->counter / timer_context()->running_frequency;
     }
@@ -119,26 +117,55 @@ __DEFINE_LXSYSCALL(void, yield)
     schedule();
 }
 
+pid_t
+_wait(pid_t wpid, int* status, int options);
+
 __DEFINE_LXSYSCALL1(pid_t, wait, int*, status)
+{
+    return _wait(-1, status, 0);
+}
+
+__DEFINE_LXSYSCALL3(pid_t, waitpid, pid_t, pid, int*, status, int, options)
+{
+    return _wait(pid, status, options);
+}
+
+pid_t
+_wait(pid_t wpid, int* status, int options)
 {
     pid_t cur = __current->pid;
+    int status_flags = 0;
     struct proc_info *proc, *n;
     if (llist_empty(&__current->children)) {
         return -1;
     }
+
+    wpid = wpid ? wpid : -__current->pgid;
+    cpu_enable_interrupt();
 repeat:
     llist_for_each(proc, n, &__current->children, siblings)
     {
-        if (proc->state == PROC_TERMNAT) {
-            goto done;
+        if (!~wpid || proc->pid == wpid || proc->pgid == -wpid) {
+            if (proc->state == PROC_TERMNAT && !options) {
+                status_flags |= PROCTERM;
+                goto done;
+            }
+            if (proc->state == PROC_STOPPED && (options & WUNTRACED)) {
+                status_flags |= PROCSTOP;
+                goto done;
+            }
         }
     }
-    // FIXME: 除了循环，也许有更高效的办法……
-    // (在这里进行schedule，需要重写context switch!)
+    if ((options & WNOHANG)) {
+        return 0;
+    }
+    // 放弃当前的运行机会
+    sched_yield();
     goto repeat;
 
 done:
-    *status = proc->exit_code;
+    cpu_disable_interrupt();
+    *status = (proc->exit_code & 0xffff) | status_flags;
     return destroy_process(proc->pid);
 }
 
@@ -174,8 +201,10 @@ push_process(struct proc_info* process)
 
     process = &sched_ctx._procs[index];
 
-    // make sure the address is in the range of process table
+    // make sure the reference is relative to process table
     llist_init_head(&process->children);
+    llist_init_head(&process->grp_member);
+
     // every process is the child of first process (pid=1)
     if (process->parent) {
         llist_append(&process->parent->children, &process->siblings);