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Separate user stack and kernel stack. Save / restore sp_el0 when switch el0 / el1.
The user program cannot be run currently.
Now the "fork" function in vm.img works and the video plays fine. TODO: - User program vm.img will use address 0x3cxxxxxx, need to figure out why and how to handle it properly - Map sigreturn to user address space and allow user to execute - Implement pt_free
The mailbox communication uses PA, and it may return some PA address at 0x3c000000 ~ 0x3f000000. The user program vm.img will use it. Currently implementation just does an identity paging for the user page table.
Fix the wrong implementation logic of reading file
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