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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-22 23:55:28 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-22 23:55:28 -0700 |
| commit | bc79a190ec8366215d67110db08a25c7f8c8bf84 (patch) | |
| tree | 1f2a15254d89bec08e77964ed979aba2b137bf53 | |
| parent | e1843988a4e5122b4817560f58c4e3385c13d4fe (diff) | |
| download | mu-bc79a190ec8366215d67110db08a25c7f8c8bf84.tar.gz | |
transfer only 16 bits at a time
| -rw-r--r-- | boot.subx | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/boot.subx b/boot.subx index 281f9287..200f201a 100644 --- a/boot.subx +++ b/boot.subx @@ -946,19 +946,14 @@ load-first-sector-from-primary-bus-secondary-drive: # out: (addr stream byte) (while-ata-busy) (until-ata-data-available) # emit results + 31/xor %eax 0/r32/eax ba/copy-to-edx 0x1f0/imm32 b9/copy-to-ecx 0x200/imm32 # 512 bytes per sector { 81 7/subop/compare %ecx 0/imm32 74/jump-if-= break/disp8 - ed/read-port-dx-into-eax - # write 4 bytes to stream one at a time - (append-byte *(ebp+8) %eax) - 49/decrement-ecx - c1/shift 5/subop/right-padding-zeroes %eax 8/imm8 - (append-byte *(ebp+8) %eax) - 49/decrement-ecx - c1/shift 5/subop/right-padding-zeroes %eax 8/imm8 + 66 ed/read-port-dx-into-ax + # write 2 bytes to stream one at a time (append-byte *(ebp+8) %eax) 49/decrement-ecx c1/shift 5/subop/right-padding-zeroes %eax 8/imm8 |