/* * Start-of-day memory layout: * 1. The domain is started within contiguous virtual-memory region. * 2. The contiguous region ends on an aligned 4MB boundary. * 3. This the order of bootstrap elements in the initial virtual region: * a. relocated kernel image * b. initial ram disk [mod_start, mod_len] * c. list of allocated page frames [mfn_list, nr_pages] * (unless relocated due to XEN_ELFNOTE_INIT_P2M) * d. start_info_t structure [register ESI (x86)] * e. bootstrap page tables [pt_base, CR3 (x86)] * f. bootstrap stack [register ESP (x86)] * 4. Bootstrap elements are packed together, but each is 4kB-aligned. * 5. The initial ram disk may be omitted. * 6. The list of page frames forms a contiguous 'pseudo-physical' memory * layout for the domain. In particular, the bootstrap virtual-memory * region is a 1:1 mapping to the first section of the pseudo-physical map. * 7. All bootstrap elements are mapped read-writable for the guest OS. The * only exception is the bootstrap page table, which is mapped read-only. * 8. There is guaranteed to be at least 512kB padding after the final * bootstrap element. If necessary, the bootstrap virtual region is * extended by an extra 4MB to ensure this. */