mirror of https://gitee.com/openkylin/qemu.git
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
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* early boot framebuffer in guest ram
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* configured using fw_cfg
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*
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* Copyright Red Hat, Inc. 2017
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*
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* Author:
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* Gerd Hoffmann <kraxel@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/loader.h"
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#include "hw/display/ramfb.h"
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#include "hw/display/bochs-vbe.h" /* for limits */
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#include "ui/console.h"
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#include "sysemu/reset.h"
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struct QEMU_PACKED RAMFBCfg {
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uint64_t addr;
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uint32_t fourcc;
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uint32_t flags;
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uint32_t width;
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uint32_t height;
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uint32_t stride;
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};
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struct RAMFBState {
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DisplaySurface *ds;
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uint32_t width, height;
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struct RAMFBCfg cfg;
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};
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static void ramfb_unmap_display_surface(pixman_image_t *image, void *unused)
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{
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void *data = pixman_image_get_data(image);
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uint32_t size = pixman_image_get_stride(image) *
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pixman_image_get_height(image);
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cpu_physical_memory_unmap(data, size, 0, 0);
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}
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static DisplaySurface *ramfb_create_display_surface(int width, int height,
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pixman_format_code_t format,
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hwaddr stride, hwaddr addr)
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{
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DisplaySurface *surface;
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hwaddr size, mapsize, linesize;
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void *data;
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if (width < 16 || width > VBE_DISPI_MAX_XRES ||
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height < 16 || height > VBE_DISPI_MAX_YRES ||
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format == 0 /* unknown format */)
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return NULL;
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linesize = width * PIXMAN_FORMAT_BPP(format) / 8;
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if (stride == 0) {
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stride = linesize;
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}
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mapsize = size = stride * (height - 1) + linesize;
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data = cpu_physical_memory_map(addr, &mapsize, false);
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if (size != mapsize) {
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cpu_physical_memory_unmap(data, mapsize, 0, 0);
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return NULL;
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}
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surface = qemu_create_displaysurface_from(width, height,
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format, stride, data);
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pixman_image_set_destroy_function(surface->image,
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ramfb_unmap_display_surface, NULL);
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return surface;
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}
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static void ramfb_fw_cfg_write(void *dev, off_t offset, size_t len)
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{
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RAMFBState *s = dev;
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DisplaySurface *surface;
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uint32_t fourcc, format, width, height;
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hwaddr stride, addr;
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width = be32_to_cpu(s->cfg.width);
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height = be32_to_cpu(s->cfg.height);
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stride = be32_to_cpu(s->cfg.stride);
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fourcc = be32_to_cpu(s->cfg.fourcc);
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addr = be64_to_cpu(s->cfg.addr);
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format = qemu_drm_format_to_pixman(fourcc);
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surface = ramfb_create_display_surface(width, height,
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format, stride, addr);
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if (!surface) {
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return;
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}
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s->width = width;
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s->height = height;
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s->ds = surface;
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}
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void ramfb_display_update(QemuConsole *con, RAMFBState *s)
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{
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if (!s->width || !s->height) {
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return;
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}
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if (s->ds) {
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dpy_gfx_replace_surface(con, s->ds);
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s->ds = NULL;
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}
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/* simple full screen update */
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dpy_gfx_update_full(con);
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}
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RAMFBState *ramfb_setup(Error **errp)
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{
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FWCfgState *fw_cfg = fw_cfg_find();
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RAMFBState *s;
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if (!fw_cfg || !fw_cfg->dma_enabled) {
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error_setg(errp, "ramfb device requires fw_cfg with DMA");
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return NULL;
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}
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s = g_new0(RAMFBState, 1);
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rom_add_vga("vgabios-ramfb.bin");
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fw_cfg_add_file_callback(fw_cfg, "etc/ramfb",
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NULL, ramfb_fw_cfg_write, s,
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&s->cfg, sizeof(s->cfg), false);
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return s;
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}
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