[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Minios-devel] [PATCH 03/40] arm64: add the boot code
Hi Shijie, More question about the boot code... On 03/11/17 03:11, Huang Shijie wrote: +ENTRY(_start) + /* Save the FDT pointer */ + mov x20, x0 + + /* Calculate where we are */ + bl _calc_offset + + PRINT("- Mini-OS booting -\n") + + PRINT("- Setup CPU -\n") + /* Setup CPU for turning on the MMU. */ + bl _setup_cpu + + PRINT("- Setup booting pagetable -\n") + /* Setup the initial page table. */ + bl _setup_initial_pgtable + + /* Setup the identity mapping */ + bl _setup_idmap_pgtable + + /* Load TTBRx */ + msr ttbr1_el1, x4 + msr ttbr0_el1, x5 First at all, this is not entirely obvious where x4 and x5 are been set. Proper documentation would be needed for that. Now, IIUC the code TTBR0_EL1 will contain the identity mappings. I was expecting to see it removed as soon as MMU is enabled. But this does not seem to be the case. Why? Cheers, -- Julien Grall _______________________________________________ Minios-devel mailing list Minios-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/cgi-bin/mailman/listinfo/minios-devel
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