Date: Mon, 25 Feb 2019 19:04:56 -0700 From: Rebecca Cran <rebecca@bluestop.org> To: freebsd-current@freebsd.org Subject: i386 EFI booting is broken (ExitBootServices called in two places) Message-ID: <e823176d-943d-148f-a358-d7b9ebe56d0c@bluestop.org>
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I've been working on some EFI changes, and in the process found that i386 booting is broken. On real hardware - my MinnowBoard Turbot - the loader hangs when calling ExitBootServices, while in a VM I get a panic saying "exec returned". The problem appears to be that ExitBootServices is called twice: elf32_exec in arch/i386/efimd.c calls bi_load which calls bi_load_efi_data in bootinfo.c - which calls ExitBootServices the first time. Then elf32_exec keeps going, and after printing "Start @ 0x....." calls ldr_enter which tries to call ExitBootServices again - this time with a mapkey whose value is zero since it never attempts to fetch the memory map. I'm guessing that subsequently causes the exec to fail. -- Rebecca Cran
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