refactor: use a more decent physical memory map

[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 533c577436b0c2d448a7e85f8d8d62a0c44ef954..370a5425c8636f21f3a6d05ce8491dc840433b29 100644 (file)
--- a/lunaix-os/kernel/process/process.c
+++ b/lunaix-os/kernel/process/process.c
@@ -1,7 +1,5 @@
-#include <arch/abi.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>
@@ -13,6 +11,9 @@
 #include <lunaix/syscall.h>
 #include <lunaix/syslog.h>
 
+#include <sys/abi.h>
+#include <sys/mm/mempart.h>
+
 LOG_MODULE("PROC")
 
 ptr_t
@@ -24,7 +25,7 @@ __dup_pagetable(pid_t pid, ptr_t mount_point)
     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);
+    size_t kspace_l1inx = L1_INDEX(KERNEL_EXEC);
 
     for (size_t i = 0; i < PG_MAX_ENTRIES - 1; i++) {
 
@@ -63,7 +64,7 @@ __del_pagetable(pid_t pid, ptr_t mount_point)
     x86_page_table* pptd = (x86_page_table*)(mount_point | (0x3FF << 12));
 
     // only remove user address space
-    for (size_t i = 0; i < L1_INDEX(KERNEL_MM_BASE); i++) {
+    for (size_t i = 0; i < L1_INDEX(KERNEL_EXEC); i++) {
         x86_pte_t ptde = pptd->entry[i];
         if (!ptde || !(ptde & PG_PRESENT)) {
             continue;
@@ -152,13 +153,13 @@ init_proc_user_space(struct proc_info* pcb)
     struct mm_region* mapped;
     struct mmap_param param = { .vms_mnt = VMS_MOUNT_1,
                                 .pvms = &pcb->mm,
-                                .mlen = USTACK_SIZE,
+                                .mlen = USR_STACK_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))) {
+    if ((status = mem_map(NULL, &mapped, USR_STACK, NULL, &param))) {
         kprint_panic("fail to alloc user stack: %d", status);
     }
 
@@ -177,12 +178,12 @@ __mark_region(ptr_t start_vpn, ptr_t end_vpn, int attr)
         x86_pte_t* curproc = &PTE_MOUNTED(VMS_SELF, i);
         x86_pte_t* newproc = &PTE_MOUNTED(VMS_MOUNT_1, i);
 
-        cpu_invplg((ptr_t)newproc);
+        cpu_flush_page((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。
-            cpu_invplg((ptr_t)curproc);
-            cpu_invplg((ptr_t)(i << 12));
+            cpu_flush_page((ptr_t)curproc);
+            cpu_flush_page((ptr_t)(i << 12));
 
             *curproc = *curproc & ~PG_WRITE;
             *newproc = *newproc & ~PG_WRITE;
@@ -211,8 +212,6 @@ dup_proc()
     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);
@@ -221,7 +220,13 @@ dup_proc()
     __copy_fdtable(pcb);
     region_copy(&__current->mm, &pcb->mm);
 
-    setup_proc_mem(pcb, VMS_SELF);
+    /*
+     *  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
 
@@ -240,18 +245,15 @@ dup_proc()
 
     vmm_unmount_pd(VMS_MOUNT_1);
 
-    // 正如同fork，返回两次。
-    store_retval_to(pcb, 0);
-
     commit_process(pcb);
 
     return pcb->pid;
 }
 
-extern void __kernel_end;
+extern void __kexec_end;
 
 void
-setup_proc_mem(struct proc_info* proc, ptr_t usedMnt)
+copy_kernel_stack(struct proc_info* proc, ptr_t usedMnt)
 {
     // copy the entire kernel page table
     pid_t pid = proc->pid;
@@ -260,7 +262,7 @@ setup_proc_mem(struct proc_info* proc, ptr_t usedMnt)
     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++) {
+    for (size_t i = KERNEL_STACK >> 12; i <= KERNEL_STACK_END >> 12; i++) {
         volatile x86_pte_t* ppte = &PTE_MOUNTED(VMS_MOUNT_1, i);
 
         /*
@@ -271,7 +273,7 @@ setup_proc_mem(struct proc_info* proc, ptr_t usedMnt)
             In the name of Celestia our glorious goddess, I will fucking HATE
            the TLB for the rest of my LIFE!
         */
-        cpu_invplg((ptr_t)ppte);
+        cpu_flush_page((ptr_t)ppte);
 
         x86_pte_t p = *ppte;
         ptr_t ppa = vmm_dup_page(pid, PG_ENTRY_ADDR(p));
@@ -279,9 +281,5 @@ setup_proc_mem(struct proc_info* proc, ptr_t usedMnt)
         *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;
 }
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