Author: ruik Date: 2009-04-16 23:09:56 +0200 (Thu, 16 Apr 2009) New Revision: 4124
Modified: trunk/coreboot-v2/src/arch/i386/boot/wakeup.S Log: Following patch flushes the instruction queue when we set PE=0. This is normally done by FAR JMP, but here it is more tricky because we run at EIP>1MB. Many thanks to Marc and Kevin to tell me how to fix it The trick is to use 0x66 prefix (done with ljmpl) it will allow to jump in real mode to any EIP addresses ;) Signed-off-by: Rudolf Marek <[email protected]> Acked-by: Peter Stuge <[email protected]> Modified: trunk/coreboot-v2/src/arch/i386/boot/wakeup.S =================================================================== --- trunk/coreboot-v2/src/arch/i386/boot/wakeup.S 2009-04-16 16:42:05 UTC (rev 4123) +++ trunk/coreboot-v2/src/arch/i386/boot/wakeup.S 2009-04-16 21:09:56 UTC (rev 4124) @@ -45,6 +45,8 @@ movl %cr0, %eax andb $0xfe,%al movl %eax, %cr0 + ljmpl $0x0, $cpu_flushed +cpu_flushed: movw $0x0, %ax movw %ax, %ds movw %ax, %es -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
