refactor: Optimize the signal context overhead

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

diff --git a/lunaix-os/kernel/process/process.c b/lunaix-os/kernel/process/process.c
index 74c93807f57115ac85f582d60c5acdd58996d313..63fc7ad081f597ebbea5f2b71263d86be17c801c 100644 (file)
--- a/lunaix-os/kernel/process/process.c
+++ b/lunaix-os/kernel/process/process.c
@@ -1,6 +1,8 @@
+#include <arch/abi.h>

 #include <klibc/string.h>
 #include <lunaix/clock.h>
 #include <lunaix/common.h>
 #include <klibc/string.h>
 #include <lunaix/clock.h>
 #include <lunaix/common.h>

+#include <lunaix/mm/mmap.h>

 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/region.h>
 #include <lunaix/mm/valloc.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/region.h>
 #include <lunaix/mm/valloc.h>


@@ -13,13 +15,13 @@
 
 LOG_MODULE("PROC")
 
 
 LOG_MODULE("PROC")
 

-void*
-__dup_pagetable(pid_t pid, uintptr_t mount_point)
+ptr_t
+__dup_pagetable(pid_t pid, ptr_t mount_point)

 {
 {

-    void* ptd_pp = pmm_alloc_page(pid, PP_FGPERSIST);
-    vmm_set_mapping(PD_REFERENCED, PG_MOUNT_1, ptd_pp, PG_PREM_RW, VMAP_NULL);
+    ptr_t ptd_pp = pmm_alloc_page(pid, PP_FGPERSIST);
+    vmm_set_mapping(VMS_SELF, PG_MOUNT_1, ptd_pp, PG_PREM_RW, VMAP_NULL);

 
 

-    x86_page_table* ptd = PG_MOUNT_1;
+    x86_page_table* ptd = (x86_page_table*)PG_MOUNT_1;

     x86_page_table* pptd = (x86_page_table*)(mount_point | (0x3FF << 12));
 
     size_t kspace_l1inx = L1_INDEX(KERNEL_MM_BASE);
     x86_page_table* pptd = (x86_page_table*)(mount_point | (0x3FF << 12));
 
     size_t kspace_l1inx = L1_INDEX(KERNEL_MM_BASE);


@@ -35,12 +37,11 @@ __dup_pagetable(pid_t pid, uintptr_t mount_point)
         }
 
         // 复制L2页表
         }
 
         // 复制L2页表

-        void* pt_pp = pmm_alloc_page(pid, PP_FGPERSIST);
-        vmm_set_mapping(
-          PD_REFERENCED, PG_MOUNT_2, pt_pp, PG_PREM_RW, VMAP_NULL);
+        ptr_t pt_pp = pmm_alloc_page(pid, PP_FGPERSIST);
+        vmm_set_mapping(VMS_SELF, PG_MOUNT_2, pt_pp, PG_PREM_RW, VMAP_NULL);

 
         x86_page_table* ppt = (x86_page_table*)(mount_point | (i << 12));
 
         x86_page_table* ppt = (x86_page_table*)(mount_point | (i << 12));

-        x86_page_table* pt = PG_MOUNT_2;
+        x86_page_table* pt = (x86_page_table*)PG_MOUNT_2;

 
         for (size_t j = 0; j < PG_MAX_ENTRIES; j++) {
             x86_pte_t pte = ppt->entry[j];
 
         for (size_t j = 0; j < PG_MAX_ENTRIES; j++) {
             x86_pte_t pte = ppt->entry[j];


@@ -48,7 +49,7 @@ __dup_pagetable(pid_t pid, uintptr_t mount_point)
             pt->entry[j] = pte;
         }
 
             pt->entry[j] = pte;
         }
 

-        ptd->entry[i] = (uintptr_t)pt_pp | PG_ENTRY_FLAGS(ptde);
+        ptd->entry[i] = (ptr_t)pt_pp | PG_ENTRY_FLAGS(ptde);

     }
 
     ptd->entry[PG_MAX_ENTRIES - 1] = NEW_L1_ENTRY(T_SELF_REF_PERM, ptd_pp);
     }
 
     ptd->entry[PG_MAX_ENTRIES - 1] = NEW_L1_ENTRY(T_SELF_REF_PERM, ptd_pp);


@@ -57,7 +58,7 @@ __dup_pagetable(pid_t pid, uintptr_t mount_point)
 }
 
 void
 }
 
 void

-__del_pagetable(pid_t pid, uintptr_t mount_point)
+__del_pagetable(pid_t pid, ptr_t mount_point)

 {
     x86_page_table* pptd = (x86_page_table*)(mount_point | (0x3FF << 12));
 
 {
     x86_page_table* pptd = (x86_page_table*)(mount_point | (0x3FF << 12));
 


@@ -84,10 +85,10 @@ __del_pagetable(pid_t pid, uintptr_t mount_point)
     pmm_free_page(pid, PG_ENTRY_ADDR(pptd->entry[PG_MAX_ENTRIES - 1]));
 }
 
     pmm_free_page(pid, PG_ENTRY_ADDR(pptd->entry[PG_MAX_ENTRIES - 1]));
 }
 

-void*
+ptr_t

 vmm_dup_vmspace(pid_t pid)
 {
 vmm_dup_vmspace(pid_t pid)
 {

-    return __dup_pagetable(pid, PD_REFERENCED);
+    return __dup_pagetable(pid, VMS_SELF);

 }
 
 __DEFINE_LXSYSCALL(pid_t, fork)
 }
 
 __DEFINE_LXSYSCALL(pid_t, fork)


@@ -135,39 +136,54 @@ __DEFINE_LXSYSCALL2(int, setpgid, pid_t, pid, pid_t, pgid)
     return 0;
 }
 
     return 0;
 }
 

+void
+__stack_copied(struct mm_region* region)
+{
+    mm_index((void**)&region->proc_vms->stack, region);
+}
+

 void
 init_proc_user_space(struct proc_info* pcb)
 {
 void
 init_proc_user_space(struct proc_info* pcb)
 {

-    vmm_mount_pd(PD_MOUNT_1, pcb->page_table);
+    vmm_mount_pd(VMS_MOUNT_1, pcb->page_table);

 
     /*---  分配用户栈  ---*/
 
 
     /*---  分配用户栈  ---*/
 

-    // 注册用户栈区域
-    region_add(
-      &pcb->mm.regions, USTACK_END, USTACK_TOP, REGION_RW | REGION_RSHARED);
-
-    // 预留地址空间，具体物理页将由Page Fault Handler按需分配。
-    for (uintptr_t i = PG_ALIGN(USTACK_END); i < USTACK_TOP; i += PG_SIZE) {
-        vmm_set_mapping(PD_MOUNT_1, i, 0, PG_ALLOW_USER | PG_WRITE, VMAP_NULL);
+    struct mm_region* mapped;
+    struct mmap_param param = { .vms_mnt = VMS_MOUNT_1,
+                                .pvms = &pcb->mm,
+                                .mlen = USTACK_SIZE,
+                                .proct = PROT_READ | PROT_WRITE,
+                                .flags = MAP_ANON | MAP_PRIVATE | MAP_FIXED,
+                                .type = REGION_TYPE_STACK };
+
+    int status = 0;
+    if ((status = mem_map(NULL, &mapped, USTACK_END, NULL, &param))) {
+        kprint_panic("fail to alloc user stack: %d", status);

     }
 
     }
 

+    mapped->region_copied = __stack_copied;
+    mm_index((void**)&pcb->mm.stack, mapped);
+

     // TODO other uspace initialization stuff
 
     // TODO other uspace initialization stuff
 

-    vmm_unmount_pd(PD_MOUNT_1);
+    vmm_unmount_pd(VMS_MOUNT_1);

 }
 
 void
 }
 
 void

-__mark_region(uintptr_t start_vpn, uintptr_t end_vpn, int attr)
+__mark_region(ptr_t start_vpn, ptr_t end_vpn, int attr)

 {
     for (size_t i = start_vpn; i <= end_vpn; i++) {
 {
     for (size_t i = start_vpn; i <= end_vpn; i++) {

-        x86_pte_t* curproc = &PTE_MOUNTED(PD_REFERENCED, i);
-        x86_pte_t* newproc = &PTE_MOUNTED(PD_MOUNT_1, i);
-        cpu_invplg(newproc);
+        x86_pte_t* curproc = &PTE_MOUNTED(VMS_SELF, i);
+        x86_pte_t* newproc = &PTE_MOUNTED(VMS_MOUNT_1, i);
+
+        cpu_invplg((ptr_t)newproc);

 
         if ((attr & REGION_MODE_MASK) == REGION_RSHARED) {
             // 如果读共享，则将两者的都标注为只读，那么任何写入都将会应用COW策略。
 
         if ((attr & REGION_MODE_MASK) == REGION_RSHARED) {
             // 如果读共享，则将两者的都标注为只读，那么任何写入都将会应用COW策略。

-            cpu_invplg(curproc);
-            cpu_invplg(i << 12);
+            cpu_invplg((ptr_t)curproc);
+            cpu_invplg((ptr_t)(i << 12));
+

             *curproc = *curproc & ~PG_WRITE;
             *newproc = *newproc & ~PG_WRITE;
         } else {
             *curproc = *curproc & ~PG_WRITE;
             *newproc = *newproc & ~PG_WRITE;
         } else {


@@ -192,41 +208,41 @@ pid_t
 dup_proc()
 {
     struct proc_info* pcb = alloc_process();
 dup_proc()
 {
     struct proc_info* pcb = alloc_process();

-    pcb->mm.u_heap = __current->mm.u_heap;

     pcb->intr_ctx = __current->intr_ctx;
     pcb->parent = __current;
 
     pcb->intr_ctx = __current->intr_ctx;
     pcb->parent = __current;
 

-    memcpy(pcb->fxstate, __current->fxstate, 512);
-

     if (__current->cwd) {
         pcb->cwd = __current->cwd;
         vfs_ref_dnode(pcb->cwd);
     }
 
     __copy_fdtable(pcb);
     if (__current->cwd) {
         pcb->cwd = __current->cwd;
         vfs_ref_dnode(pcb->cwd);
     }
 
     __copy_fdtable(pcb);

-    region_copy(&__current->mm.regions, &pcb->mm.regions);
+    region_copy(&__current->mm, &pcb->mm);

 
 

-    setup_proc_mem(pcb, PD_REFERENCED);
+    /*
+     *  store the return value for forked process.
+     *  this will be implicit carried over after kernel stack is copied.
+     */
+    store_retval(0);
+
+    copy_kernel_stack(pcb, VMS_SELF);

 
     // 根据 mm_region 进一步配置页表
 
     struct mm_region *pos, *n;
 
     // 根据 mm_region 进一步配置页表
 
     struct mm_region *pos, *n;

-    llist_for_each(pos, n, &pcb->mm.regions.head, head)
+    llist_for_each(pos, n, &pcb->mm.regions, head)

     {
         // 如果写共享，则不作处理。
         if ((pos->attr & REGION_WSHARED)) {
             continue;
         }
 
     {
         // 如果写共享，则不作处理。
         if ((pos->attr & REGION_WSHARED)) {
             continue;
         }
 

-        uintptr_t start_vpn = pos->start >> 12;
-        uintptr_t end_vpn = pos->end >> 12;
+        ptr_t start_vpn = pos->start >> 12;
+        ptr_t end_vpn = pos->end >> 12;

         __mark_region(start_vpn, end_vpn, pos->attr);
     }
 
         __mark_region(start_vpn, end_vpn, pos->attr);
     }
 

-    vmm_unmount_pd(PD_MOUNT_1);
-
-    // 正如同fork，返回两次。
-    pcb->intr_ctx.registers.eax = 0;
+    vmm_unmount_pd(VMS_MOUNT_1);

 
     commit_process(pcb);
 
 
     commit_process(pcb);
 


@@ -236,17 +252,17 @@ dup_proc()
 extern void __kernel_end;
 
 void
 extern void __kernel_end;
 
 void

-setup_proc_mem(struct proc_info* proc, uintptr_t usedMnt)
+copy_kernel_stack(struct proc_info* proc, ptr_t usedMnt)

 {
     // copy the entire kernel page table
     pid_t pid = proc->pid;
 {
     // copy the entire kernel page table
     pid_t pid = proc->pid;

-    void* pt_copy = __dup_pagetable(pid, usedMnt);
+    ptr_t pt_copy = __dup_pagetable(pid, usedMnt);

 
 

-    vmm_mount_pd(PD_MOUNT_1, pt_copy); // 将新进程的页表挂载到挂载点#2
+    vmm_mount_pd(VMS_MOUNT_1, pt_copy); // 将新进程的页表挂载到挂载点#2

 
     // copy the kernel stack
     for (size_t i = KSTACK_START >> 12; i <= KSTACK_TOP >> 12; i++) {
 
     // copy the kernel stack
     for (size_t i = KSTACK_START >> 12; i <= KSTACK_TOP >> 12; i++) {

-        volatile x86_pte_t* ppte = &PTE_MOUNTED(PD_MOUNT_1, i);
+        volatile x86_pte_t* ppte = &PTE_MOUNTED(VMS_MOUNT_1, i);

 
         /*
             This is a fucking nightmare, the TLB caching keep the rewrite to PTE
 
         /*
             This is a fucking nightmare, the TLB caching keep the rewrite to PTE


@@ -256,17 +272,13 @@ setup_proc_mem(struct proc_info* proc, uintptr_t usedMnt)
             In the name of Celestia our glorious goddess, I will fucking HATE
            the TLB for the rest of my LIFE!
         */
             In the name of Celestia our glorious goddess, I will fucking HATE
            the TLB for the rest of my LIFE!
         */

-        cpu_invplg(ppte);
+        cpu_invplg((ptr_t)ppte);

 
         x86_pte_t p = *ppte;
 
         x86_pte_t p = *ppte;

-        void* ppa = vmm_dup_page(pid, PG_ENTRY_ADDR(p));
+        ptr_t ppa = vmm_dup_page(pid, PG_ENTRY_ADDR(p));

         pmm_free_page(pid, PG_ENTRY_ADDR(p));
         pmm_free_page(pid, PG_ENTRY_ADDR(p));

-        *ppte = (p & 0xfff) | (uintptr_t)ppa;
+        *ppte = (p & 0xfff) | ppa;

     }
 
     }
 

-    // 我们不需要分配内核的区域，因为所有的内核代码和数据段只能通过系统调用来访问，任何非法的访问
-    // 都会导致eip落在区域外面，从而segmentation fault.
-
-    // 至于其他的区域我们暂时没有办法知道，因为那需要知道用户程序的信息。我们留到之后在处理。

     proc->page_table = pt_copy;
 }
\ No newline at end of file
     proc->page_table = pt_copy;
 }
\ No newline at end of file