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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-04-17 19:49:50 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-04-17 19:49:50 -0700 |
| commit | 18e8ee4e16d5a7a1b68a66eb02387e00fb4b55cf (patch) | |
| tree | 43aa78b8e32242489957092fbb6aa99dccdd3801 | |
| parent | 31a2c8aac6e32773c593bf5fc89bfe5ae6469fca (diff) | |
| download | mu-18e8ee4e16d5a7a1b68a66eb02387e00fb4b55cf.tar.gz | |
start flushing the ATA disk cache
"Make sure to do a Cache Flush (ATA command 0xE7) after each write command completes." https://wiki.osdev.org/index.php?title=ATA_PIO_Mode&oldid=25664#Writing_28_bit_LBA
| -rw-r--r-- | boot.subx | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/boot.subx b/boot.subx index c19ab02a..0b840d58 100644 --- a/boot.subx +++ b/boot.subx @@ -1047,6 +1047,7 @@ $store-sectors:store-sector: eb/jump loop/disp8 } } + (flush-ata-cache *(ebp+8)) $store-sectors:end: # . restore registers 5b/pop-to-ebx @@ -1325,6 +1326,23 @@ $wait-400ns:end: 5d/pop-to-ebp c3/return +# Flush cache isn't in ATA 3, but it shows up by the ATA 5 spec: +# http://hddguru.com/download/documentation/ATA-ATAPI-standard-5/ATA-ATAPI-5.pdf +flush-ata-cache: # disk: (addr disk) + # . prologue + 55/push-ebp + 89/<- %ebp 4/r32/esp + # + (ata-drive-select *(ebp+8) 0) + (ata-command *(ebp+8) 0xe7) # flush cache + (while-ata-busy *(ebp+8)) + (until-ata-ready-for-data *(ebp+8)) +$flush-ata-cache:end: + # . epilogue + 89/<- %esp 5/r32/ebp + 5d/pop-to-ebp + c3/return + # }}} ## Controlling a PS/2 mouse |