/* * Copyright (c) 2018-2020, Andreas Kling * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include namespace Kernel { #define MAX_RESOLUTION_WIDTH 4096 #define MAX_RESOLUTION_HEIGHT 2160 #define VBE_DISPI_IOPORT_INDEX 0x01CE #define VBE_DISPI_IOPORT_DATA 0x01CF #define VBE_DISPI_INDEX_ID 0x0 #define VBE_DISPI_INDEX_XRES 0x1 #define VBE_DISPI_INDEX_YRES 0x2 #define VBE_DISPI_INDEX_BPP 0x3 #define VBE_DISPI_INDEX_ENABLE 0x4 #define VBE_DISPI_INDEX_BANK 0x5 #define VBE_DISPI_INDEX_VIRT_WIDTH 0x6 #define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7 #define VBE_DISPI_INDEX_X_OFFSET 0x8 #define VBE_DISPI_INDEX_Y_OFFSET 0x9 #define VBE_DISPI_DISABLED 0x00 #define VBE_DISPI_ENABLED 0x01 #define VBE_DISPI_LFB_ENABLED 0x40 static BXVGADevice* s_the; BXVGADevice& BXVGADevice::the() { return *s_the; } BXVGADevice::BXVGADevice() : BlockDevice(29, 0) { s_the = this; m_framebuffer_address = PhysicalAddress(find_framebuffer_address()); } void BXVGADevice::set_register(u16 index, u16 data) { IO::out16(VBE_DISPI_IOPORT_INDEX, index); IO::out16(VBE_DISPI_IOPORT_DATA, data); } void BXVGADevice::set_resolution(int width, int height) { m_framebuffer_pitch = width * sizeof(u32); m_framebuffer_width = width; m_framebuffer_height = height; set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED); set_register(VBE_DISPI_INDEX_XRES, (u16)width); set_register(VBE_DISPI_INDEX_YRES, (u16)height); set_register(VBE_DISPI_INDEX_VIRT_WIDTH, (u16)width); set_register(VBE_DISPI_INDEX_VIRT_HEIGHT, (u16)height * 2); set_register(VBE_DISPI_INDEX_BPP, 32); set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED); set_register(VBE_DISPI_INDEX_BANK, 0); dbg() << "BXVGADevice resolution set to " << m_framebuffer_width << "x" << m_framebuffer_height << " (pitch=" << m_framebuffer_pitch << ")"; } void BXVGADevice::set_y_offset(int y_offset) { ASSERT(y_offset == 0 || y_offset == m_framebuffer_height); m_y_offset = y_offset; set_register(VBE_DISPI_INDEX_Y_OFFSET, (u16)y_offset); } u32 BXVGADevice::find_framebuffer_address() { // NOTE: The QEMU card has the same PCI ID as the Bochs one. static const PCI::ID bochs_vga_id = { 0x1234, 0x1111 }; static const PCI::ID virtualbox_vga_id = { 0x80ee, 0xbeef }; u32 framebuffer_address = 0; PCI::enumerate_all([&framebuffer_address](const PCI::Address& address, PCI::ID id) { if (id == bochs_vga_id || id == virtualbox_vga_id) { framebuffer_address = PCI::get_BAR0(address) & 0xfffffff0; kprintf("BXVGA: framebuffer @ P%x\n", framebuffer_address); } }); return framebuffer_address; } KResultOr BXVGADevice::mmap(Process& process, FileDescription&, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot) { REQUIRE_PROMISE(video); ASSERT(offset == 0); ASSERT(size == framebuffer_size_in_bytes()); auto vmobject = AnonymousVMObject::create_for_physical_range(m_framebuffer_address, framebuffer_size_in_bytes()); if (!vmobject) return KResult(-ENOMEM); auto* region = process.allocate_region_with_vmobject( preferred_vaddr, framebuffer_size_in_bytes(), vmobject.release_nonnull(), 0, "BXVGA Framebuffer", prot); dbg() << "BXVGADevice: mmap with size " << region->size() << " at " << region->vaddr(); ASSERT(region); return region; } int BXVGADevice::ioctl(FileDescription&, unsigned request, unsigned arg) { REQUIRE_PROMISE(video); switch (request) { case FB_IOCTL_GET_SIZE_IN_BYTES: { auto* out = (size_t*)arg; if (!Process::current->validate_write_typed(out)) return -EFAULT; *out = framebuffer_size_in_bytes(); return 0; } case FB_IOCTL_GET_BUFFER: { auto* index = (int*)arg; if (!Process::current->validate_write_typed(index)) return -EFAULT; *index = m_y_offset == 0 ? 0 : 1; return 0; } case FB_IOCTL_SET_BUFFER: { if (arg != 0 && arg != 1) return -EINVAL; set_y_offset(arg == 0 ? 0 : m_framebuffer_height); return 0; } case FB_IOCTL_GET_RESOLUTION: { auto* resolution = (FBResolution*)arg; if (!Process::current->validate_write_typed(resolution)) return -EFAULT; resolution->pitch = m_framebuffer_pitch; resolution->width = m_framebuffer_width; resolution->height = m_framebuffer_height; return 0; } case FB_IOCTL_SET_RESOLUTION: { auto* resolution = (FBResolution*)arg; if (!Process::current->validate_read_typed(resolution) || !Process::current->validate_write_typed(resolution)) return -EFAULT; if (resolution->width > MAX_RESOLUTION_WIDTH || resolution->height > MAX_RESOLUTION_HEIGHT) return -EINVAL; set_resolution(resolution->width, resolution->height); resolution->pitch = m_framebuffer_pitch; resolution->width = m_framebuffer_width; resolution->height = m_framebuffer_height; return 0; } default: return -EINVAL; }; } }