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fix: disk drive-explicitly writing 0 bytes would write 4096 bytes instead

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This commit is contained in:
minjaesong
2023-06-16 13:31:38 +09:00
parent 974be9dda6
commit a83cdc1a02
5 changed files with 41 additions and 12 deletions
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BIN
lib/TerranVirtualDisk-src.jar
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lib/TerranVirtualDisk.jar
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4
terranmon.txt
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@@ -115,12 +115,12 @@ MMIO
n-read: size of the block from the other device, LSB (4096-full block size is zero)
m-read: size of the block from the other device, MSB (4096-full block size is zero)
a-read: if the other device hasNext (doYouHaveNext), false if device not present
z-read: set if the size is actually 0 instead of 4096
z-read: set if the size is actually 0 instead of 4096 (overrides n and m parameters)
n-write: size of the block I'm sending, LSB (4096-full block size is zero)
m-write: size of the block I'm sending, MSB (4096-full block size is zero)
a-write: if there's more to send (hasNext)
z-write: set if the size is actually 0 instead of 4096
z-write: set if the size is actually 0 instead of 4096 (overrides n and m parameters)
4092..4095 RW: Block transfer control for Port 1 through 4
0b 00ms abcd

38
tsvm_core/src/net/torvald/tsvm/peripheral/TestDiskDrive.kt
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@@ -121,6 +121,8 @@ class TestDiskDrive(private val vm: VM, private val driveNum: Int, theRootPath:
val sendSize = if (blockSendBuffer.size - (blockSendCount * BLOCK_SIZE) < BLOCK_SIZE)
blockSendBuffer.size % BLOCK_SIZE
else if (blockSendBuffer.size <= BLOCK_SIZE)
blockSendBuffer.size
else BLOCK_SIZE
// println("blockSendCount = ${blockSendCount}; sendSize = $sendSize; blockSendBuffer.size = ${blockSendBuffer.size}")
@@ -147,21 +149,41 @@ class TestDiskDrive(private val vm: VM, private val driveNum: Int, theRootPath:
//println("[DiskDrive] writeout with inputdata length of ${inputData.size}")
//println("[DiskDriveMsg] ${inputData.toString(Charsets.UTF_8)}")
// println("[TestDiskDrive] (write-payload of ${inputData.size} bytes; $writeBufferUsage out of $writeModeLength bytes has been written so far)")
if (!fileOpen) throw InternalError("File is not open but the drive is in write mode")
System.arraycopy(inputData, 0, writeBuffer, writeBufferUsage, minOf(writeModeLength - writeBufferUsage, inputData.size, BLOCK_SIZE))
writeBufferUsage += inputData.size
if (writeModeLength == 0) {
// println("[TestDiskDrive] write mode was initiated with zero-byte writing; closing immediately")
if (writeBufferUsage >= writeModeLength) {
// commit to the disk
if (appendMode)
file.appendBytes(writeBuffer)
else if (writeMode)
file.writeBytes(writeBuffer)
if (writeMode)
file.writeBytes(ByteArray(0))
writeMode = false
appendMode = false
}
else {
System.arraycopy(
inputData,
0,
writeBuffer,
writeBufferUsage,
minOf(writeModeLength - writeBufferUsage, inputData.size, BLOCK_SIZE)
)
writeBufferUsage += inputData.size
if (writeBufferUsage >= writeModeLength) {
// commit to the disk
if (appendMode)
file.appendBytes(writeBuffer)
else if (writeMode)
file.writeBytes(writeBuffer)
writeMode = false
appendMode = false
}
}
}
else if (fileOpenMode == 17) {
if (!fileOpen) throw InternalError("Bootloader file is not open but the drive is in boot write mode")

11
tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt
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@@ -117,6 +117,8 @@ class TevdDiskDrive(private val vm: VM, private val driveNum: Int, theTevdPath:
val sendSize = if (blockSendBuffer.size - (blockSendCount * BLOCK_SIZE) < BLOCK_SIZE)
blockSendBuffer.size % BLOCK_SIZE
else if (blockSendBuffer.size <= BLOCK_SIZE)
blockSendBuffer.size
else BLOCK_SIZE
// println("blockSendCount = ${blockSendCount}; sendSize = $sendSize; blockSendBuffer.size = ${blockSendBuffer.size}")
@@ -143,12 +145,17 @@ class TevdDiskDrive(private val vm: VM, private val driveNum: Int, theTevdPath:
//println("[DiskDrive] writeout with inputdata length of ${inputData.size}")
//println("[DiskDriveMsg] ${inputData.toString(Charsets.UTF_8)}")
println("[TevDiskDrive] write-payload (${inputData.size} bytes)")
// println("[TevDiskDrive] (write-payload of ${inputData.size} bytes; $writeBufferUsage out of $writeModeLength bytes has been written so far)")
if (!fileOpen) throw InternalError("File is not open but the drive is in write mode")
if (writeBuffer.isEmpty()) {
if (writeModeLength == 0) {
// println("[TevDiskDrive] write mode was initiated with zero-byte writing; closing immediately")
if (writeMode)
file.overwrite(ByteArray(0))
writeMode = false
appendMode = false
}