mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
429 lines
9.9 KiB
C++
429 lines
9.9 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012, 2014, 2015.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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video.cpp
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Framework for Sortix video drivers.
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*******************************************************************************/
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#include <stdarg.h>
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#include <errno.h>
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#include <string.h>
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#include <sortix/kernel/copy.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/string.h>
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#include <sortix/kernel/syscall.h>
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#include <sortix/kernel/textbuffer.h>
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#include <sortix/kernel/video.h>
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namespace Sortix {
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namespace Video {
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const uint64_t ONE_AND_ONLY_DEVICE = 0;
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const uint64_t ONE_AND_ONLY_CONNECTOR = 0;
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kthread_mutex_t video_lock = KTHREAD_MUTEX_INITIALIZER;
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struct DeviceEntry
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{
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char* name;
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VideoDevice* device;
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};
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size_t num_devices = 0;
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size_t devices_length = 0;
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DeviceEntry* devices = NULL;
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bool RegisterDevice(const char* name, VideoDevice* device)
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{
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ScopedLock lock(&video_lock);
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if ( num_devices == devices_length )
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{
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size_t newdevices_length = devices_length ? 2 * devices_length : 8UL;
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DeviceEntry* newdevices = new DeviceEntry[newdevices_length];
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if ( !newdevices )
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return false;
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memcpy(newdevices, devices, sizeof(*devices) * num_devices);
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delete[] devices; devices = newdevices;
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devices_length = devices_length;
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}
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char* drivername = String::Clone(name);
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if ( !drivername )
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return false;
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size_t index = num_devices++;
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devices[index].name = drivername;
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devices[index].device = device;
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return true;
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}
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__attribute__((unused))
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static bool TransmitString(struct dispmsg_string* dest, const char* str)
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{
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size_t size = strlen(str) + 1;
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size_t dest_size = dest->byte_size;
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dest->byte_size = size;
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if ( dest_size < size )
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return errno = ERANGE, false;
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return CopyToUser(dest->str, str, size);
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}
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__attribute__((unused))
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static char* ReceiveString(struct dispmsg_string* src)
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{
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if ( !src->byte_size )
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return errno = EINVAL, (char*) NULL;
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char* ret = new char[src->byte_size];
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if ( !ret )
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return NULL;
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if ( !CopyFromUser(ret, src->str, src->byte_size) )
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return NULL;
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if ( ret[src->byte_size-1] != '\0' )
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{
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delete[] ret;
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return errno = EINVAL, (char*) NULL;
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}
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return ret;
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}
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static int EnumerateDevices(void* ptr, size_t size)
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{
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struct dispmsg_enumerate_devices msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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size_t requested_num_devices = msg.devices_length;
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msg.devices_length = num_devices;
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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if ( requested_num_devices < num_devices )
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return errno = ERANGE, -1;
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for ( uint64_t i = 0; i < num_devices; i++ )
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if ( !CopyToUser(&msg.devices[i], &i, sizeof(i)) )
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return -1;
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return 0;
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}
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static int GetDriverCount(void* ptr, size_t size)
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{
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struct dispmsg_get_driver_count msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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msg.driver_count = 1;
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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return 0;
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}
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static int GetDriverName(void* ptr, size_t size)
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{
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struct dispmsg_get_driver_name msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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DeviceEntry* device_entry = &devices[msg.device];
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if ( !TransmitString(&msg.name, device_entry->name) )
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return -1;
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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return 0;
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}
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static int GetDriver(void* ptr, size_t size)
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{
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struct dispmsg_get_driver msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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msg.driver_index = 0;
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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return 0;
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}
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static int SetDriver(void* ptr, size_t size)
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{
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struct dispmsg_set_driver msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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if ( msg.driver_index != 0 )
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return errno = EINVAL, -1;
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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return 0;
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}
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static int SetCrtcMode(void* ptr, size_t size)
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{
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struct dispmsg_set_crtc_mode msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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DeviceEntry* device_entry = &devices[msg.device];
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VideoDevice* device = device_entry->device;
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if ( !device->SwitchMode(msg.connector, msg.mode) )
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return -1;
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// TODO: This could potentially fail.
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if ( msg.device == ONE_AND_ONLY_DEVICE &&
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msg.connector == ONE_AND_ONLY_CONNECTOR )
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Log::device_textbufhandle->Replace(device->CreateTextBuffer(msg.connector));
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// No need to respond.
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return 0;
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}
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static int GetCrtcMode(void* ptr, size_t size)
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{
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struct dispmsg_get_crtc_mode msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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DeviceEntry* device_entry = &devices[msg.device];
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VideoDevice* device = device_entry->device;
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// TODO: There is no real way to detect failure here.
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errno = 0;
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struct dispmsg_crtc_mode mode = device->GetCurrentMode(msg.connector);
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if ( !(mode.control & DISPMSG_CONTROL_VALID) && errno != 0 )
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return -1;
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msg.mode = mode;
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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return 0;
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}
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static int GetCrtcModes(void* ptr, size_t size)
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{
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struct dispmsg_get_crtc_modes msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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DeviceEntry* device_entry = &devices[msg.device];
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VideoDevice* device = device_entry->device;
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size_t nummodes;
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struct dispmsg_crtc_mode* modes = device->GetModes(msg.connector, &nummodes);
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if ( !modes )
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return -1;
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size_t requested_modes = msg.modes_length;
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msg.modes_length = nummodes;
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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if ( requested_modes < nummodes )
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{
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delete[] modes;
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return errno = ERANGE, -1;
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}
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for ( size_t i = 0; i < nummodes; i++ )
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{
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if ( !CopyToUser(&msg.modes[i], &modes[i], sizeof(modes[i])) )
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{
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delete[] modes;
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return -1;
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}
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}
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delete[] modes;
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return 0;
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}
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static int GetMemorySize(void* ptr, size_t size)
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{
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struct dispmsg_get_memory_size msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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DeviceEntry* device_entry = &devices[msg.device];
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VideoDevice* device = device_entry->device;
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msg.memory_size = device->FrameSize();
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if ( !CopyToUser(ptr, &msg, sizeof(msg)) )
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return -1;
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return 0;
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}
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static int WriteMemory(void* ptr, size_t size)
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{
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struct dispmsg_write_memory msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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DeviceEntry* device_entry = &devices[msg.device];
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VideoDevice* device = device_entry->device;
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ioctx_t ctx; SetupUserIOCtx(&ctx);
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if ( device->WriteAt(&ctx, msg.offset, msg.src, msg.size) < 0 )
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return -1;
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return 0;
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}
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static int ReadMemory(void* ptr, size_t size)
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{
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struct dispmsg_read_memory msg;
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if ( size != sizeof(msg) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&msg, ptr, sizeof(msg)) )
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return -1;
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ScopedLock lock(&video_lock);
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if ( num_devices <= msg.device )
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return errno = ENODEV, -1;
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DeviceEntry* device_entry = &devices[msg.device];
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VideoDevice* device = device_entry->device;
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ioctx_t ctx; SetupUserIOCtx(&ctx);
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if ( device->ReadAt(&ctx, msg.offset, msg.dst, msg.size) < 0 )
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return -1;
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return 0;
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}
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} // namespace Video
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} // namespace Sortix
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namespace Sortix {
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int sys_dispmsg_issue(void* ptr, size_t size)
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{
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using namespace Video;
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struct dispmsg_header hdr;
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if ( size < sizeof(hdr) )
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return errno = EINVAL, -1;
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if ( !CopyFromUser(&hdr, ptr, sizeof(hdr)) )
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return -1;
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switch ( hdr.msgid )
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{
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case DISPMSG_ENUMERATE_DEVICES: return EnumerateDevices(ptr, size);
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case DISPMSG_GET_DRIVER_COUNT: return GetDriverCount(ptr, size);
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case DISPMSG_GET_DRIVER_NAME: return GetDriverName(ptr, size);
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case DISPMSG_GET_DRIVER: return GetDriver(ptr, size);
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case DISPMSG_SET_DRIVER: return SetDriver(ptr, size);
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case DISPMSG_SET_CRTC_MODE: return SetCrtcMode(ptr, size);
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case DISPMSG_GET_CRTC_MODE: return GetCrtcMode(ptr, size);
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case DISPMSG_GET_CRTC_MODES: return GetCrtcModes(ptr, size);
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case DISPMSG_GET_MEMORY_SIZE: return GetMemorySize(ptr, size);
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case DISPMSG_WRITE_MEMORY: return WriteMemory(ptr, size);
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case DISPMSG_READ_MEMORY: return ReadMemory(ptr, size);
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default:
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return errno = ENOSYS, -1;
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}
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}
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} // namespace Sortix
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