feat: msync(2)

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

diff --git a/lunaix-os/kernel/process/sched.c b/lunaix-os/kernel/process/sched.c
index c2a24261dde6c7dc92eba8285b37368209c9a457..1c6bd977833145e61061d124eda41c96a7532818 100644 (file)
--- a/lunaix-os/kernel/process/sched.c
+++ b/lunaix-os/kernel/process/sched.c
@@ -7,6 +7,7 @@
 #include <lunaix/fs/taskfs.h>
 #include <lunaix/mm/cake.h>
 #include <lunaix/mm/kalloc.h>
+#include <lunaix/mm/mmap.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/valloc.h>
 #include <lunaix/mm/vmm.h>
@@ -20,6 +21,8 @@
 
 volatile struct proc_info* __current;
 
+static struct proc_info dummy_proc;
+
 struct proc_info dummy;
 
 struct scheduler sched_ctx;
@@ -28,23 +31,58 @@ struct cake_pile* proc_pile;
 
 LOG_MODULE("SCHED")
 
+void
+sched_init_dummy();
+
 void
 sched_init()
 {
-    // size_t pg_size = ROUNDUP(sizeof(struct proc_info) * MAX_PROCESS, 0x1000);
-
-    // 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_START + i, pa, PG_PREM_RW, VMAP_NULL);
-    // }
-
     proc_pile = cake_new_pile("proc", sizeof(struct proc_info), 1, 0);
     cake_set_constructor(proc_pile, cake_ctor_zeroing);
 
     sched_ctx = (struct scheduler){ ._procs = vzalloc(PROC_TABLE_SIZE),
                                     .ptable_len = 0,
                                     .procs_index = 0 };
+
+    // TODO initialize dummy_proc
+    sched_init_dummy();
+}
+
+#define DUMMY_STACK_SIZE 2048
+
+void
+sched_init_dummy()
+{
+    // This surely need to be simplified or encapsulated!
+    // It is a living nightmare!
+
+    extern void my_dummy();
+    static char dummy_stack[DUMMY_STACK_SIZE] __attribute__((aligned(16)));
+
+    // memset to 0
+    dummy_proc = (struct proc_info){};
+    dummy_proc.intr_ctx = (isr_param){
+        .registers = { .ds = KDATA_SEG,
+                       .es = KDATA_SEG,
+                       .fs = KDATA_SEG,
+                       .gs = KDATA_SEG,
+                       .esp = (void*)dummy_stack + DUMMY_STACK_SIZE - 20 },
+        .cs = KCODE_SEG,
+        .eip = (void*)my_dummy,
+        .ss = KDATA_SEG,
+        .eflags = cpu_reflags() | 0x0200
+    };
+
+    *(u32_t*)(&dummy_stack[DUMMY_STACK_SIZE - 4]) = dummy_proc.intr_ctx.eflags;
+    *(u32_t*)(&dummy_stack[DUMMY_STACK_SIZE - 8]) = KCODE_SEG;
+    *(u32_t*)(&dummy_stack[DUMMY_STACK_SIZE - 12]) = dummy_proc.intr_ctx.eip;
+
+    dummy_proc.page_table = cpu_rcr3();
+    dummy_proc.state = PS_READY;
+    dummy_proc.parent = &dummy_proc;
+    dummy_proc.pid = KERNEL_PID;
+
+    __current = &dummy_proc;
 }
 
 void
@@ -142,11 +180,18 @@ redo:
 
     sched_ctx.procs_index = ptr;
 
+    if (next->state != PS_READY) {
+        // schedule the dummy process if we're out of choice
+        next = &dummy_proc;
+        goto done;
+    }
+
     if (!can_schedule(next)) {
         // 如果该进程不给予调度，则尝试重新选择
         goto redo;
     }
 
+done:
     run(next);
 }
 
@@ -286,7 +331,7 @@ alloc_process()
     proc->fxstate =
       vzalloc_dma(512); // FXSAVE需要十六位对齐地址，使用DMA块（128位对齐）
 
-    llist_init_head(&proc->mm.regions.head);
+    llist_init_head(&proc->mm.regions);
     llist_init_head(&proc->tasks);
     llist_init_head(&proc->children);
     llist_init_head(&proc->grp_member);
@@ -356,17 +401,18 @@ destroy_process(pid_t pid)
     vfree(proc->fdtable);
     vfree_dma(proc->fxstate);
 
+    vmm_mount_pd(VMS_MOUNT_1, proc->page_table);
+
     struct mm_region *pos, *n;
-    llist_for_each(pos, n, &proc->mm.regions.head, head)
+    llist_for_each(pos, n, &proc->mm.regions, head)
     {
+        mem_sync_pages(VMS_MOUNT_1, pos, pos->start, pos->end - pos->start, 0);
         vfree(pos);
     }
 
-    vmm_mount_pd(PD_MOUNT_1, proc->page_table);
-
-    __del_pagetable(pid, PD_MOUNT_1);
+    __del_pagetable(pid, VMS_MOUNT_1);
 
-    vmm_unmount_pd(PD_MOUNT_1);
+    vmm_unmount_pd(VMS_MOUNT_1);
 
     cake_release(proc_pile, proc);