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| author | Rudolf Marek <r.marek@assembler.cz> | 2009-04-16 21:09:56 +0000 |
|---|---|---|
| committer | Rudolf Marek <r.marek@assembler.cz> | 2009-04-16 21:09:56 +0000 |
| commit | e4be46b4c39305e4224595f2655c2c9a439bc57c (patch) | |
| tree | f241694f16a61d80116cc9131de945c0cb13301b /src | |
| parent | f9fab37ecb9b900550a904d95c9962f0ba65358f (diff) | |
| download | coreboot-e4be46b4c39305e4224595f2655c2c9a439bc57c.tar.xz | |
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 <r.marek@assembler.cz>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4124 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/i386/boot/wakeup.S | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/arch/i386/boot/wakeup.S b/src/arch/i386/boot/wakeup.S index 5985c8e1c0..7915fc38c5 100644 --- a/src/arch/i386/boot/wakeup.S +++ b/src/arch/i386/boot/wakeup.S @@ -45,6 +45,8 @@ reload_cs: movl %cr0, %eax andb $0xfe,%al movl %eax, %cr0 + ljmpl $0x0, $cpu_flushed +cpu_flushed: movw $0x0, %ax movw %ax, %ds movw %ax, %es |