diff options
Diffstat (limited to 'kernel/vmem.c')
| -rw-r--r-- | kernel/vmem.c | 45 |
1 files changed, 27 insertions, 18 deletions
diff --git a/kernel/vmem.c b/kernel/vmem.c index ffa9099..ade0a01 100644 --- a/kernel/vmem.c +++ b/kernel/vmem.c @@ -313,7 +313,8 @@ pdirectory* vmem_kernel_dir() pdirectory* vmem_new_space_dir(pdirectory *copy_dir,bool stack_only) { - pdirectory* dir = vmem_clean_dir(); + pdirectory* dir = vmem_clean_dir(); //let's start with a fresh page directory + //link non-user pages. for(int i=0;i<1024;i++) { @@ -324,41 +325,49 @@ pdirectory* vmem_new_space_dir(pdirectory *copy_dir,bool stack_only) vmem_add_alloc(dir,VMEM_USER_PROG,1024*4,true); vmem_add_alloc(dir,VMEM_USER_STACK_TOP-4096*VMEM_USER_STACK_PAGES,VMEM_USER_STACK_PAGES,true); - x86_cli(); // plese dear timer, do not schedule us away - pdirectory* orig=x86_get_page_directory(); - x86_set_page_directory(dir); + pdirectory* mydir=x86_get_page_directory(); - //copy user pages. - //TODO: stack only! + //copy user pages (TODO: stack only version for cloning!) uint32_t virt=0; for(int i=0;i<1024;i++) { uint32_t src_pt=copy_dir->m_entries [i]; + uint32_t dst_pt=dir->m_entries [i]; + if(pt_entry_is_user(src_pt)) { - ptable *table=pt_entry_get_frame(&src_pt); + ptable *src_table=pt_entry_get_frame(&src_pt); + ptable *dst_table=pt_entry_get_frame(&dst_pt); + for(int j=0;j<1024;j++) { - uint32_t src_pd=table->m_entries[j]; - uint32_t phys=pd_entry_get_frame(&src_pd); + uint32_t src_pd=src_table->m_entries[j]; + uint32_t dst_pd=dst_table->m_entries[j]; + + uint32_t src_phys=pd_entry_get_frame(&src_pd); + uint32_t dst_phys=pd_entry_get_frame(&dst_pd); + if(src_pd) { - // klog("copy %x to %x",phys,virt); - vmem_clear_one(dir,VMEM_COPY_PAGE); - vmem_add_remap(dir,phys,VMEM_COPY_PAGE,1,false); + klog("copy virt: %x / phys: %x -> %x",virt,src_phys,dst_phys); + + vmem_clear_one(mydir,VMEM_COPY_PAGE); + vmem_clear_one(mydir,VMEM_COPY_PAGE+4096); + + vmem_add_remap(mydir,src_phys,VMEM_COPY_PAGE,1,false); + vmem_add_remap(mydir,dst_phys,VMEM_COPY_PAGE+4096,1,false); + x86_invlpg(VMEM_COPY_PAGE); // refresh TLB - memcpy(virt,VMEM_COPY_PAGE,4096); + x86_invlpg(VMEM_COPY_PAGE+4096); // refresh TLB + + memcpy(VMEM_COPY_PAGE+4096,VMEM_COPY_PAGE,4096); } - virt+=4096; + virt+=4096; } - } else virt+=4096*1024; } - x86_set_page_directory(orig); - x86_sti(); - return dir; } |