1 /* 2 * early boot framebuffer in guest ram 3 * configured using fw_cfg 4 * 5 * Copyright Red Hat, Inc. 2017 6 * 7 * Author: 8 * Gerd Hoffmann <kraxel@redhat.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2 or later. 11 * See the COPYING file in the top-level directory. 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qapi/error.h" 16 #include "qemu/option.h" 17 #include "hw/loader.h" 18 #include "hw/display/ramfb.h" 19 #include "ui/console.h" 20 #include "sysemu/reset.h" 21 22 struct QEMU_PACKED RAMFBCfg { 23 uint64_t addr; 24 uint32_t fourcc; 25 uint32_t flags; 26 uint32_t width; 27 uint32_t height; 28 uint32_t stride; 29 }; 30 31 struct RAMFBState { 32 DisplaySurface *ds; 33 uint32_t width, height; 34 uint32_t starting_width, starting_height; 35 struct RAMFBCfg cfg; 36 bool locked; 37 }; 38 39 static void ramfb_unmap_display_surface(pixman_image_t *image, void *unused) 40 { 41 void *data = pixman_image_get_data(image); 42 uint32_t size = pixman_image_get_stride(image) * 43 pixman_image_get_height(image); 44 cpu_physical_memory_unmap(data, size, 0, 0); 45 } 46 47 static DisplaySurface *ramfb_create_display_surface(int width, int height, 48 pixman_format_code_t format, 49 int linesize, uint64_t addr) 50 { 51 DisplaySurface *surface; 52 hwaddr size; 53 void *data; 54 55 if (linesize == 0) { 56 linesize = width * PIXMAN_FORMAT_BPP(format) / 8; 57 } 58 59 size = (hwaddr)linesize * height; 60 data = cpu_physical_memory_map(addr, &size, 0); 61 if (size != (hwaddr)linesize * height) { 62 cpu_physical_memory_unmap(data, size, 0, 0); 63 return NULL; 64 } 65 66 surface = qemu_create_displaysurface_from(width, height, 67 format, linesize, data); 68 pixman_image_set_destroy_function(surface->image, 69 ramfb_unmap_display_surface, NULL); 70 71 return surface; 72 } 73 74 static void ramfb_fw_cfg_write(void *dev, off_t offset, size_t len) 75 { 76 RAMFBState *s = dev; 77 uint32_t fourcc, format, width, height; 78 hwaddr stride, addr; 79 80 width = be32_to_cpu(s->cfg.width); 81 height = be32_to_cpu(s->cfg.height); 82 stride = be32_to_cpu(s->cfg.stride); 83 fourcc = be32_to_cpu(s->cfg.fourcc); 84 addr = be64_to_cpu(s->cfg.addr); 85 format = qemu_drm_format_to_pixman(fourcc); 86 87 fprintf(stderr, "%s: %dx%d @ 0x%" PRIx64 "\n", __func__, 88 width, height, addr); 89 if (s->locked) { 90 fprintf(stderr, "%s: resolution locked, change rejected\n", __func__); 91 return; 92 } 93 s->locked = true; 94 s->width = width; 95 s->height = height; 96 s->ds = ramfb_create_display_surface(s->width, s->height, 97 format, stride, addr); 98 } 99 100 void ramfb_display_update(QemuConsole *con, RAMFBState *s) 101 { 102 if (!s->width || !s->height) { 103 return; 104 } 105 106 if (s->ds) { 107 dpy_gfx_replace_surface(con, s->ds); 108 s->ds = NULL; 109 } 110 111 /* simple full screen update */ 112 dpy_gfx_update_full(con); 113 } 114 115 static void ramfb_reset(void *opaque) 116 { 117 RAMFBState *s = (RAMFBState *)opaque; 118 s->locked = false; 119 memset(&s->cfg, 0, sizeof(s->cfg)); 120 s->cfg.width = s->starting_width; 121 s->cfg.height = s->starting_height; 122 } 123 124 RAMFBState *ramfb_setup(DeviceState* dev, Error **errp) 125 { 126 FWCfgState *fw_cfg = fw_cfg_find(); 127 RAMFBState *s; 128 129 if (!fw_cfg || !fw_cfg->dma_enabled) { 130 error_setg(errp, "ramfb device requires fw_cfg with DMA"); 131 return NULL; 132 } 133 134 s = g_new0(RAMFBState, 1); 135 136 const char *s_fb_width = qemu_opt_get(dev->opts, "xres"); 137 const char *s_fb_height = qemu_opt_get(dev->opts, "yres"); 138 if (s_fb_width) { 139 s->cfg.width = atoi(s_fb_width); 140 s->starting_width = s->cfg.width; 141 } 142 if (s_fb_height) { 143 s->cfg.height = atoi(s_fb_height); 144 s->starting_height = s->cfg.height; 145 } 146 s->locked = false; 147 148 rom_add_vga("vgabios-ramfb.bin"); 149 fw_cfg_add_file_callback(fw_cfg, "etc/ramfb", 150 NULL, ramfb_fw_cfg_write, s, 151 &s->cfg, sizeof(s->cfg), false); 152 qemu_register_reset(ramfb_reset, s); 153 return s; 154 } 155