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Joshua Wise's Git repositories - netwatch.git/blame_incremental - tools/poke-rls-asm.S
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| Commit | Line | Data |
|---|
| | 1 | .global poke |
| | 2 | poke: |
| | 3 | # Preload registers: $0x1BADD00D |
| | 4 | mov $0x1BADD00D, %ecx |
| | 5 | |
| | 6 | # Parameter: I/O port to set bit 2 of |
| | 7 | mov 4(%esp), %dx |
| | 8 | inl %dx, %eax |
| | 9 | or $4, %eax |
| | 10 | outl %eax, %dx |
| | 11 | |
| | 12 | # Count down for a while |
| | 13 | mov $0x10000, %edx |
| | 14 | loop: |
| | 15 | dec %edx |
| | 16 | jz loop |
| | 17 | |
| | 18 | # Maybe SMM poked something? |
| | 19 | mov %ecx, %eax |
| | 20 | ret |
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