On Tue, 5 Aug 2014 13:51:30 +0200 Bruno Prémont wrote: > On Tue, 5 Aug 2014 10:18:48 +0100 Matt Fleming wrote: > > On Tue, 05 Aug, at 11:13:30AM, Bruno Prémont wrote: > > > > > > I get at least to just before > > > status = efi_call_early(exit_boot_services, handle, key); > > > in eboot.c on line 1310. A efi_printk inserted there is displayed. > > > > This is worth pointing out in case you're unaware, but do you know that > > it's not valid to call efi_printk() after ExitBootServices()? Doing so > > will almost certainly cause your machine to fault. > > I am aware that efi_printk() uses boot services! > > > Now I tried out loops at many places and have gotten up to line 340 in > > arch/x86/kernel/head_64.S oops, bad copy&paste, should have been arch/x86/boot/compressed/head_64.S > System reboots within the following assembler instructions (does not > reach line 359). > > So efi_main() returns successfully but the assembler code following it > gets something wrong. > > I'm going to try further to determine which line between 340 and 359 is > the "bad" one. arch/x86/boot/compressed/head_64.S 341 /* 342 * Copy the compressed kernel to the end of our buffer 343 * where decompression in place becomes safe. 344 */ 345 pushq %rsi 346 leaq (_bss-8)(%rip), %rsi 347 leaq (_bss-8)(%rbx), %rdi 348 movq $_bss /* - $startup_32 */, %rcx 349 shrq $3, %rcx 350 std code gets up to here 351 rep movsq this location is never reached but instead system reboots 352 cld 353 popq %rsi 354 355 /* 356 * Jump to the relocated address. 357 */ Bruno -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
