80 lines
4.8 KiB
Text
80 lines
4.8 KiB
Text
quit task is int 0x38
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yield task is int 0x39
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eax is cleared on yield
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syscall is int 0x30
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system call number in eax
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args in ebx, ecx, edx, esi, edi
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result in eax
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modifies ecx, edx
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modifies eax even if no value is returned
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see table 1
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file system calls have units of bytes unless otherwise specified.
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functions returning handles or pointers use 0 to indicate error.
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see keys.txt for the return type of the "get key" system call.
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the edx register of "start task" is a pointer to a null-terminated string.
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a pointer to a readonly copy of this string is put into the new task's edx.
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the esi register of the new task contains a handle to the caller's task.
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the edi register is copied directly, and is intended to hold a task handle.
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this task handle is who stdio ipc communication should be done with.
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ipc operations return 0xffffffff if the specified task doesn't exist.
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"find unread ipc" system call returns 0 if there is no unread ipc.
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invalid system call numbers change eax to -1, and have no other effect.
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table 1:
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function | eax | eax out | ebx | ecx | edx | esi | edi
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-------------------|------|-----------------|----------------|----------------|--------------|--------------|--------------
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open file | 0x00 | handle | drive number | path | | |
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close file | 0x01 | | handle | | | |
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file read | 0x02 | read | handle | file offset | count | buffer |
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get file size | 0x03 | size | handle | | | |
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start task | 0x04 | handle | drive number | path | passed sz | | passed dword
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ipc send | 0x05 | written | task handle | max count | buffer | |
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ipc read | 0x06 | read | task handle | max count | buffer | |
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allocate ram | 0x07 | start pointer | pages | | | |
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memory info | 0x08 | see table 2 | see table 2 | | | |
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wait for task | 0x09 | | handle | | | |
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enumerate dir | 0x0a | count | drive number | path | see table 3 | max |
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system log | 0x0b | | message sz | | | |
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count of dir | 0x0c | number of files | drive number | path | | |
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new window | 0x0d | window handle | width | height | pixel buffer | |
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delete window | 0x0e | | window handle | | | |
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resize window | 0x0f | | window handle | width | height | |
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reassign pixbuf | 0x10 | | window handle | pixel buffer | | |
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paint window | 0x11 | | window handle | | | |
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get win action | 0x12 | | window handle | action pointer | | |
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wait for action | 0x13 | | | | | |
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wait ipc send | 0x14 | | sending task | | | |
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wait any ipc send | 0x15 | | | | | |
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find unread ipc | 0x16 | sending task | | | | |
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wait ipc read | 0x17 | | reading task | | | |
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is task running | 0x18 | boolean | task handle | | | |
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table 2:
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all values are in units of pages
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eax -1 indicates unrecognized ebx
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ebx | eax out
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-----|--------------------------
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0x0 | kernel dynamic area size
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0x1 | kernel dynamic area left
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0x2 | total userspace size
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0x3 | total userspace left
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0x4 | this process memory left
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table 3:
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edx of "enumerate dir" is a pointer to a buffer where an array of "directory info"s can be put.
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esi is the maximum number of "directory info"s to be placed in the buffer.
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the "directory info" structure is 128 bytes long. The first 100 bytes are a null-terminated string
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indicating the name of the file represented by this entry. The next four bytes are a 32-bit integer
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indicating the size of the file represented in bytes. The next byte's lowest bit is a one if this
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entry is a directory, and a zero if this entry is not. The remainder of the structure is reserved.
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