| /SPARTAN/trunk/arch/amd64/src/asm_utils.S |
|---|
| 55,6 → 55,26 |
| .global set_efer_flag |
| # THIS IS USERSPACE CODE |
| .global utext |
| utext: |
| xor %ax,%ax; |
| mov %ax,%ds; |
| mov %ax,%es; |
| mov %ax,%fs; |
| mov %ax,%gs; |
| 0: |
| int $48 |
| jmp 0b |
| # not reached |
| utext_end: |
| .data |
| .global utext_size |
| utext_size: |
| .long utext_end - utext |
| ## Determine CPUID support |
| # |
| # Return 0 in EAX if CPUID is not support, 1 if supported. |