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/*
* early boot framebuffer in guest ram
* configured using fw_cfg
*
* Copyright Red Hat, Inc. 2017
*
* Author:
* Gerd Hoffmann <kraxel@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/loader.h"
#include "hw/display/ramfb.h"
#include "ui/console.h"
#include "sysemu/sysemu.h"
struct QEMU_PACKED RAMFBCfg {
uint64_t addr;
uint32_t fourcc;
uint32_t flags;
uint32_t width;
uint32_t height;
uint32_t stride;
};
struct RAMFBState {
DisplaySurface *ds;
uint32_t width, height;
struct RAMFBCfg cfg;
};
static void ramfb_fw_cfg_write(void *dev, off_t offset, size_t len)
{
RAMFBState *s = dev;
void *framebuffer;
uint32_t fourcc, format;
hwaddr stride, addr, length;
s->width = be32_to_cpu(s->cfg.width);
s->height = be32_to_cpu(s->cfg.height);
stride = be32_to_cpu(s->cfg.stride);
fourcc = be32_to_cpu(s->cfg.fourcc);
addr = be64_to_cpu(s->cfg.addr);
length = stride * s->height;
format = qemu_drm_format_to_pixman(fourcc);
fprintf(stderr, "%s: %dx%d @ 0x%" PRIx64 "\n", __func__,
s->width, s->height, addr);
framebuffer = address_space_map(&address_space_memory,
addr, &length, false,
MEMTXATTRS_UNSPECIFIED);
if (!framebuffer || length < stride * s->height) {
s->width = 0;
s->height = 0;
return;
}
s->ds = qemu_create_displaysurface_from(s->width, s->height,
format, stride, framebuffer);
}
void ramfb_display_update(QemuConsole *con, RAMFBState *s)
{
if (!s->width || !s->height) {
return;
}
if (s->ds) {
dpy_gfx_replace_surface(con, s->ds);
s->ds = NULL;
}
/* simple full screen update */
dpy_gfx_update_full(con);
}
RAMFBState *ramfb_setup(Error **errp)
{
FWCfgState *fw_cfg = fw_cfg_find();
RAMFBState *s;
if (!fw_cfg || !fw_cfg->dma_enabled) {
error_setg(errp, "ramfb device requires fw_cfg with DMA");
return NULL;
}
s = g_new0(RAMFBState, 1);
rom_add_vga("vgabios-ramfb.bin");
fw_cfg_add_file_callback(fw_cfg, "etc/ramfb",
NULL, ramfb_fw_cfg_write, s,
&s->cfg, sizeof(s->cfg), false);
return s;
}
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