250 lines
8.6 KiB
PHP
250 lines
8.6 KiB
PHP
; Initialization of the USB subsystem.
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; Provides usb_init procedure, includes all needed files.
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; General notes:
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; * There is one entry point for external kernel code: usb_init is called
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; from initialization code and initializes USB subsystem.
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; * There are several entry points for API; see the docs for description.
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; * There are several functions which are called from controller-specific
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; parts of USB subsystem. The most important is usb_new_device,
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; which is called when a new device has been connected (over some time),
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; has been reset and is ready to start configuring.
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; * IRQ handlers are very restricted. They can not take any locks,
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; since otherwise a deadlock is possible: imagine that a code has taken the
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; lock and was interrupted by IRQ handler. Now IRQ handler would wait for
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; releasing the lock, and a lock owner would wait for exiting IRQ handler
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; to get the control.
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; * Thus, there is the special USB thread which processes almost all activity.
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; IRQ handlers do the minimal processing and wake this thread.
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; * Also the USB thread wakes occasionally to process tasks which can be
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; predicted without interrupts. These include e.g. a periodic roothub
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; scanning in UHCI and initializing in USB_CONNECT_DELAY ticks
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; after connecting a new device.
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; * The main procedure of USB thread, usb_thread_proc, does all its work
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; by querying usb_hardware_func.ProcessDeferred for every controller
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; and usb_hub_process_deferred for every hub.
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; ProcessDeferred does controller-specific actions and calculates the time
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; when it should be invoked again, possibly infinite.
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; usb_thread_proc selects the minimum from all times returned by
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; ProcessDeferred and sleeps until this moment is reached or the thread
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; is awakened by IRQ handler.
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; Initializes the USB subsystem.
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proc usb_init
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; 1. Initialize all locks.
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mov ecx, usb_controllers_list_mutex
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call mutex_init
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mov ecx, usb1_ep_mutex
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call mutex_init
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mov ecx, usb_gtd_mutex
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call mutex_init
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mov ecx, ehci_ep_mutex
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call mutex_init
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mov ecx, ehci_gtd_mutex
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call mutex_init
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; 2. Kick off BIOS from all USB controllers, calling the corresponding function
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; *hci_kickoff_bios. Also count USB controllers for the next step.
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; Note: USB1 companion(s) must go before the corresponding EHCI controller,
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; otherwise BIOS could see a device moving from EHCI to a companion;
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; first, this always wastes time;
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; second, some BIOSes are buggy, do not expect that move and try to refer to
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; previously-assigned controller instead of actual; sometimes that leads to
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; hangoff.
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; Thus, process controllers in PCI order.
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mov esi, pcidev_list
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push 0
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.kickoff:
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mov esi, [esi+PCIDEV.fd]
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cmp esi, pcidev_list
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jz .done_kickoff
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cmp word [esi+PCIDEV.class+1], 0x0C03
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jnz .kickoff
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mov eax, uhci_kickoff_bios
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cmp byte [esi+PCIDEV.class], 0x00
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jz .do_kickoff
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mov eax, ohci_kickoff_bios
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cmp byte [esi+PCIDEV.class], 0x10
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jz .do_kickoff
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mov eax, ehci_kickoff_bios
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cmp byte [esi+PCIDEV.class], 0x20
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jnz .kickoff
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.do_kickoff:
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inc dword [esp]
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call eax
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jmp .kickoff
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.done_kickoff:
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pop eax
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; 3. If no controllers were found, exit.
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; Otherwise, run the USB thread.
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test eax, eax
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jz .nothing
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call create_usb_thread
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jz .nothing
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; 4. Initialize all USB controllers, calling usb_init_controller for each.
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; Note: USB1 companion(s) should go before the corresponding EHCI controller,
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; although this is not strictly necessary (this way, a companion would not try
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; to initialize high-speed device only to see a disconnect when EHCI takes
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; control).
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; Thus, process all EHCI controllers in the first loop, all USB1 controllers
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; in the second loop. (One loop in reversed PCI order could also be used,
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; but seems less natural.)
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; 4a. Loop over all PCI devices, call usb_init_controller
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; for all EHCI controllers.
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mov eax, pcidev_list
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.scan_ehci:
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mov eax, [eax+PCIDEV.fd]
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cmp eax, pcidev_list
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jz .done_ehci
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cmp [eax+PCIDEV.class], 0x0C0320
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jnz .scan_ehci
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mov edi, ehci_hardware_func
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call usb_init_controller
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jmp .scan_ehci
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.done_ehci:
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; 4b. Loop over all PCI devices, call usb_init_controller
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; for all UHCI and OHCI controllers.
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mov eax, pcidev_list
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.scan_usb1:
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mov eax, [eax+PCIDEV.fd]
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cmp eax, pcidev_list
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jz .done_usb1
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mov edi, uhci_hardware_func
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cmp [eax+PCIDEV.class], 0x0C0300
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jz @f
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mov edi, ohci_hardware_func
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cmp [eax+PCIDEV.class], 0x0C0310
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jnz .scan_usb1
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@@:
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call usb_init_controller
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jmp .scan_usb1
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.done_usb1:
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.nothing:
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ret
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endp
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uglobal
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align 4
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usb_event dd ?
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endg
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; Helper function for usb_init. Creates and initializes the USB thread.
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proc create_usb_thread
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; 1. Create the thread.
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push edi
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push 1
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pop ebx
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mov ecx, usb_thread_proc
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xor edx, edx
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call new_sys_threads
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pop edi
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; If failed, say something to the debug board and return with ZF set.
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test eax, eax
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jns @f
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DEBUGF 1,'K : cannot create kernel thread for USB, error %d\n',eax
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.clear:
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xor eax, eax
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jmp .nothing
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@@:
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; 2. Wait while the USB thread initializes itself.
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@@:
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call change_task
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cmp [usb_event], 0
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jz @b
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; 3. If initialization failed, the USB thread sets [usb_event] to -1.
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; Return with ZF set or cleared corresponding to the result.
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cmp [usb_event], -1
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jz .clear
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.nothing:
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ret
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endp
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; Helper function for IRQ handlers. Wakes the USB thread if ebx is nonzero.
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proc usb_wakeup_if_needed
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test ebx, ebx
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jz usb_wakeup.nothing
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usb_wakeup:
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xor edx, edx
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mov eax, [usb_event]
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mov ebx, [eax+EVENT.id]
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xor esi, esi
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call raise_event
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.nothing:
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ret
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endp
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; Main loop of the USB thread.
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proc usb_thread_proc
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; 1. Initialize: create event to allow wakeup by interrupt handlers.
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xor esi, esi
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mov ecx, MANUAL_DESTROY
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call create_event
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test eax, eax
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jnz @f
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; If failed, set [usb_event] to -1 and terminate myself.
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dbgstr 'cannot create event for USB thread'
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or [usb_event], -1
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jmp sys_end
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@@:
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mov [usb_event], eax
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push -1 ; initial timeout: infinite
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usb_thread_wait:
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; 2. Main loop: wait for either wakeup event or timeout.
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pop ecx ; get timeout
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mov eax, [usb_event]
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mov ebx, [eax+EVENT.id]
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call wait_event_timeout
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push -1 ; default timeout: infinite
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; 3. Main loop: call worker functions of all controllers;
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; if some function schedules wakeup in timeout less than the current value,
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; replace that value with the returned timeout.
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mov esi, usb_controllers_list
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@@:
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mov esi, [esi+usb_controller.Next]
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cmp esi, usb_controllers_list
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jz .controllers_done
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mov eax, [esi+usb_controller.HardwareFunc]
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call [eax+usb_hardware_func.ProcessDeferred]
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cmp [esp], eax
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jb @b
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mov [esp], eax
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jmp @b
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.controllers_done:
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; 4. Main loop: call hub worker function for all hubs,
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; similarly calculating minimum of all returned timeouts.
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; When done, continue to 2.
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mov esi, usb_hubs_list
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@@:
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mov esi, [esi+usb_hub.Next]
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cmp esi, usb_hubs_list
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jz usb_thread_wait
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call usb_hub_process_deferred
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cmp [esp], eax
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jb @b
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mov [esp], eax
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jmp @b
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endp
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iglobal
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align 4
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usb_controllers_list:
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dd usb_controllers_list
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dd usb_controllers_list
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usb_hubs_list:
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dd usb_hubs_list
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dd usb_hubs_list
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endg
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uglobal
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align 4
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usb_controllers_list_mutex MUTEX
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endg
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include "memory.inc"
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include "hccommon.inc"
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include "pipe.inc"
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include "ohci.inc"
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include "uhci.inc"
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include "ehci.inc"
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include "protocol.inc"
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include "hub.inc"
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include "scheduler.inc"
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