diff options
Diffstat (limited to 'kernel/usermode.h')
| -rw-r--r-- | kernel/usermode.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/kernel/usermode.h b/kernel/usermode.h new file mode 100644 index 0000000..e9195e1 --- /dev/null +++ b/kernel/usermode.h @@ -0,0 +1,46 @@ +// https://xarnze.com/posts/post/Tutorial:%20Entering%20User%20mode +// http://wiki.osdev.org/TSS +// http://wiki.osdev.org/Global_Descriptor_Table + +typedef volatile struct strtss{ + unsigned short link; + unsigned short link_h; + unsigned long esp0; + unsigned short ss0; + unsigned short ss0_h; + unsigned long esp1; + unsigned short ss1; + unsigned short ss1_h; + unsigned long esp2; + unsigned short ss2; + unsigned short ss2_h; + unsigned long cr3; + unsigned long eip; + unsigned long eflags; + unsigned long eax; + unsigned long ecx; + unsigned long edx; + unsigned long ebx; + unsigned long esp; + unsigned long ebp; + unsigned long esi; + unsigned long edi; + unsigned short es; + unsigned short es_h; + unsigned short cs; + unsigned short cs_h; + unsigned short ss; + unsigned short ss_h; + unsigned short ds; + unsigned short ds_h; + unsigned short fs; + unsigned short fs_h; + unsigned short gs; + unsigned short gs_h; + unsigned short ldt; + unsigned short ldt_h; + unsigned short trap; + unsigned short iomap; +}__attribute__((packed)) tss_struct; + +tss_struct sys_tss; //Define the TSS as a global structure |