A20_TEST_ADDR 56 arch/x86/boot/a20.c saved = ctr = rdfs32(A20_TEST_ADDR); A20_TEST_ADDR 59 arch/x86/boot/a20.c wrfs32(++ctr, A20_TEST_ADDR); A20_TEST_ADDR 61 arch/x86/boot/a20.c ok = rdgs32(A20_TEST_ADDR+0x10) ^ ctr; A20_TEST_ADDR 66 arch/x86/boot/a20.c wrfs32(saved, A20_TEST_ADDR);