X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/fa57b4a05aa12d594f40e0894e0ac6f810a7095c..0eabc11fcf240415e39f3873dfce7cd9384b3042:/lunaix-os/kernel/process/sched.c

diff --git a/lunaix-os/kernel/process/sched.c b/lunaix-os/kernel/process/sched.c
index 4e3f290..edde8bc 100644
--- a/lunaix-os/kernel/process/sched.c
+++ b/lunaix-os/kernel/process/sched.c
@@ -6,7 +6,7 @@
 
 #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>
@@ -18,8 +18,12 @@
 #include <lunaix/syscall.h>
 #include <lunaix/syslog.h>
 
+#include <klibc/string.h>
+
 volatile struct proc_info* __current;
 
+static struct proc_info dummy_proc;
+
 struct proc_info dummy;
 
 struct scheduler sched_ctx;
@@ -28,23 +32,58 @@ 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)));
+
+    struct exec_param* execp =
+      (void*)dummy_stack + DUMMY_STACK_SIZE - sizeof(struct exec_param);
+
+    *execp = (struct exec_param){
+        .cs = KCODE_SEG,
+        .eflags = cpu_reflags() | 0x0200,
+        .eip = (void*)my_dummy,
+        .ss = KDATA_SEG,
+    };
+
+    // 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 },
+                                       .execp = execp };
+
+    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
@@ -60,7 +99,7 @@ run(struct proc_info* proc)
         由于这中间没有进行地址空间的交换，所以第二次跳转使用的是同一个内核栈，而之前默认tss.esp0的值是永远指向最顶部
         这样一来就有可能会覆盖更早的上下文信息（比如嵌套的信号捕获函数）
     */
-    tss_update_esp(proc->intr_ctx.registers.esp);
+    tss_update_esp(proc->intr_ctx.esp);
 
     apic_done_servicing();
 
@@ -142,11 +181,18 @@ 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);
 }
 
@@ -169,10 +215,14 @@ __DEFINE_LXSYSCALL1(unsigned int, sleep, unsigned int, seconds)
 
     struct proc_info* root_proc = sched_ctx._procs[0];
     __current->sleep.wakeup_time = clock_systime() + seconds * 1000;
-    llist_append(&root_proc->sleep.sleepers, &__current->sleep.sleepers);
+
+    if (llist_empty(&__current->sleep.sleepers)) {
+        llist_append(&root_proc->sleep.sleepers, &__current->sleep.sleepers);
+    }
 
     __current->intr_ctx.registers.eax = seconds;
-    __current->state = PS_BLOCKED;
+
+    block_current();
     schedule();
 }
 
@@ -279,13 +329,14 @@ alloc_process()
 
     proc->state = PS_CREATED;
     proc->pid = i;
+    proc->mm.pid = i;
     proc->created = clock_systime();
     proc->pgid = proc->pid;
     proc->fdtable = vzalloc(sizeof(struct v_fdtable));
     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);
@@ -346,24 +397,27 @@ destroy_process(pid_t pid)
 
     for (size_t i = 0; i < VFS_MAX_FD; i++) {
         struct v_fd* fd = proc->fdtable->fds[i];
-        if (fd)
+        if (fd) {
             vfs_pclose(fd->file, pid);
+            vfs_free_fd(fd);
+        }
     }
 
     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)
     {
-        vfree(pos);
+        mem_sync_pages(VMS_MOUNT_1, pos, pos->start, pos->end - pos->start, 0);
+        region_release(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);