diff options
Diffstat (limited to 'i386/pc/i16/i16_raw_test_a20.S')
| -rw-r--r-- | i386/pc/i16/i16_raw_test_a20.S | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/i386/pc/i16/i16_raw_test_a20.S b/i386/pc/i16/i16_raw_test_a20.S deleted file mode 100644 index a934e12..0000000 --- a/i386/pc/i16/i16_raw_test_a20.S +++ /dev/null @@ -1,35 +0,0 @@ - -#include <mach/machine/asm.h> - - .text - .code16 - -/* - * Test the A20 address line; return true if it is enabled. - */ -ENTRY(i16_raw_test_a20) - xorw %ax,%ax - movw %ax,%fs - notw %ax - movw %ax,%gs - - /* See if the values in already in the corresponding locations - are the same. */ - movw %fs:0,%ax - cmpw %gs:16,%ax - jnz 1f - - /* Yes; try changing one and see if they're still the same. */ - movw %ax,%dx - notw %ax - movw %ax,%fs:0 - cmpw %gs:16,%ax - movw %dx,%fs:0 - jnz 1f - - xorl %eax,%eax - ret -1: - movl $1,%eax - ret - |