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| 2008 | * eax = owner PID |
2008 | * eax = owner PID |
| 2009 | * eax = 0, if there is no owner |
2009 | * eax = 0, if there is no owner |
| 2010 | * eax = -1 for incorrect ebx |
2010 | * eax = -1 for incorrect ebx |
| Line 2011... | Line 2011... | ||
| 2011 | 2011 | ||
| 2012 | ====================================================================== |
2012 | ====================================================================== |
| 2013 | ==================== Function 42 - read IRQ data. ==================== |
2013 | ==================== Function 42 - work with IRQ data. =============== |
| - | 2014 | ====================================================================== |
|
| - | 2015 | ||
| - | 2016 | ------------------------ Reading data -------------------------------- |
|
| 2014 | ====================================================================== |
2017 | |
| 2015 | When an IRQ occurs, the system reads data from ports indicated |
2018 | When an IRQ occurs, the system reads data from ports indicated |
| 2016 | earlier by function 44 and writes this data to |
2019 | earlier by function 44 and writes this data to |
| 2017 | internal buffer. This function reads out data from that buffer |
2020 | internal buffer. This function reads out data from that buffer |
| 2018 | bytewise. |
2021 | to the buffer specified as parameter. |
| 2019 | Parameters: |
2022 | Parameters: |
| 2020 | * eax = 42 - function number |
2023 | * eax = 42 - function number |
| - | 2024 | * bl = IRQ number, 0..15 |
|
| - | 2025 | * bh = subfunction number, 0 |
|
| - | 2026 | Other part of register ebx, must be zero. |
|
| 2021 | * ebx = IRQ number, 0..15 |
2027 | * ecx = pointer to the receive buffer |
| 2022 | Returned value: (use value of ecx to distinguish) |
2028 | Returned value: (use value of eax to distinguish) |
| 2023 | * if the thread is not IRQ owner (or IRQ number is incorrect): |
2029 | * if the thread is not IRQ owner (or IRQ number is incorrect): |
| 2024 | * ecx = 2 |
2030 | * eax = -1 |
| 2025 | * if there is no data: |
2031 | * if there is no data: |
| 2026 | * eax = 0 |
- | |
| 2027 | * ecx = 1 |
- | |
| 2028 | * ebx destroyed |
2032 | * eax = 0 |
| 2029 | * if all is ok: |
2033 | * if all is ok: |
| - | 2034 | * eax = byte size of data, read from buffer |
|
| - | 2035 | ||
| - | 2036 | See remarks below. |
|
| - | 2037 | ||
| - | 2038 | ------------------------ Get data size ------------------------------- |
|
| - | 2039 | ||
| - | 2040 | Parameters: |
|
| - | 2041 | * eax = 42 - function number |
|
| - | 2042 | * bl = IRQ number, 0..15 |
|
| - | 2043 | * bh = subfunction number, 0 |
|
| - | 2044 | Other part of register ebx, must be zero. |
|
| - | 2045 | * ecx = pointer to receive buffer |
|
| - | 2046 | Returned value: (use value of eax to distinguish) |
|
| 2030 | * eax = byte size of data, not yet read from buffer |
2047 | * if the thread is not IRQ owner (or IRQ number is incorrect): |
| - | 2048 | * eax = -1 |
|
| 2031 | * ecx = 0 |
2049 | * if all is ok: |
| - | 2050 | * eax = byte size of data in buffer |
|
| 2032 | * ebx = current byte |
2051 | |
| 2033 | Remarks: |
2052 | Remarks: |
| 2034 | * Previously the thread must reserve indicated IRQ for itself |
2053 | * Previously the thread must reserve indicated IRQ for itself |
| 2035 | by function 45. |
2054 | by function 45. |
| 2036 | * The size of data buffer is 4000 bytes, on overflow |
2055 | * The size of data buffer is 4000 bytes, on overflow |