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qemu: add qemu ramfb support 

Add support for qemu ramfb.  This is a simple boot framebuffer device,
with normal ram being used to back the framebuffer and fw_cfg being used
to configure the device.

Use case (on x86): boot display for vgpu devices (which neither emulate
vga nor have a vgabios).

Sharing fw_cfg code with seabios turned out to be difficuilt due to
various dependencies the code has on infrastructure which only seabios
has.  So include a copy of the code here, with those dependencies
removed and also stripped down because we don't need a non-dma fallback
here.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit d9a8b867a3)
This commit is contained in:
Gerd Hoffmann 2017-11-15 14:43:10 +01:00
parent a2e4001a2c
commit f88297a0d6
5 changed files with 189 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Makefile
View File

@ -213,7 +213,7 @@ SRCVGA=src/output.c src/string.c src/hw/pci.c src/hw/serialio.c \
vgasrc/vgafonts.c vgasrc/vbe.c \
vgasrc/stdvga.c vgasrc/stdvgamodes.c vgasrc/stdvgaio.c \
vgasrc/clext.c vgasrc/bochsvga.c vgasrc/geodevga.c \
src/fw/coreboot.c vgasrc/cbvga.c vgasrc/bochsdisplay.c
src/fw/coreboot.c vgasrc/cbvga.c vgasrc/bochsdisplay.c vgasrc/ramfb.c
ifeq "$(CONFIG_VGA_FIXUP_ASM)" "y"
$(OUT)vgaccode16.raw.s: $(OUT)autoconf.h $(patsubst %.c, $(OUT)%.o,$(SRCVGA)) ; $(call whole-compile, $(filter-out -fomit-frame-pointer,$(CFLAGS16)) -fno-omit-frame-pointer -S -Isrc, $(SRCVGA),$@)

7
vgasrc/Kconfig
View File

@ -70,6 +70,13 @@ menu "VGA ROM"
v3.0+. The vgabios works with the qemu stdvga too (use
"qemu -device VGA,romfile=/path/to/vgabios.bin")".
config VGA_RAMFB
depends on QEMU
bool "qemu ramfb"
select VGA_EMULATE_TEXT
help
qemu ram framebuffer support (-device ramfb).
endchoice
choice

163
vgasrc/ramfb.c Normal file
View File

@ -0,0 +1,163 @@
#include "biosvar.h" // GET_BDA
#include "output.h" // dprintf
#include "string.h" // memset16_far
#include "vgautil.h" // VBE_total_memory
#include "std/pmm.h" // struct pmmheader
#include "byteorder.h"
#include "fw/paravirt.h"
/* ---------------------------------------------------------------------- */
/* minimal qemu fc_cfg support bits, requires dma support */
#define QEMU_CFG_FILE_DIR 0x19
struct QemuCfgFile {
u32 size; /* file size */
u16 select; /* write this to 0x510 to read it */
u16 reserved;
char name[56];
};
static void
qemu_cfg_dma_transfer(void *address, u32 length, u32 control)
{
QemuCfgDmaAccess access;
if (length == 0) {
return;
}
access.address = cpu_to_be64((u64)(u32)address);
access.length = cpu_to_be32(length);
access.control = cpu_to_be32(control);
barrier();
outl(cpu_to_be32((u32)&access), PORT_QEMU_CFG_DMA_ADDR_LOW);
while(be32_to_cpu(access.control) & ~QEMU_CFG_DMA_CTL_ERROR)
/* wait */;
}
static void
qemu_cfg_read(void *buf, int len)
{
qemu_cfg_dma_transfer(buf, len, QEMU_CFG_DMA_CTL_READ);
}
static void
qemu_cfg_read_entry(void *buf, int e, int len)
{
u32 control = (e << 16) | QEMU_CFG_DMA_CTL_SELECT
| QEMU_CFG_DMA_CTL_READ;
qemu_cfg_dma_transfer(buf, len, control);
}
static void
qemu_cfg_write_entry(void *buf, int e, int len)
{
u32 control = (e << 16) | QEMU_CFG_DMA_CTL_SELECT
| QEMU_CFG_DMA_CTL_WRITE;
qemu_cfg_dma_transfer(buf, len, control);
}
static int
qemu_cfg_find_file(const char *filename)
{
u32 count, e, select;
qemu_cfg_read_entry(&count, QEMU_CFG_FILE_DIR, sizeof(count));
count = be32_to_cpu(count);
for (select = 0, e = 0; e < count; e++) {
struct QemuCfgFile qfile;
qemu_cfg_read(&qfile, sizeof(qfile));
if (memcmp_far(GET_SEG(SS), qfile.name,
GET_SEG(CS), filename, 10) == 0)
select = be16_to_cpu(qfile.select);
}
return select;
}
/* ---------------------------------------------------------------------- */
#define FRAMEBUFFER_WIDTH 1024
#define FRAMEBUFFER_HEIGHT 768
#define FRAMEBUFFER_BPP 4
#define FRAMEBUFFER_STRIDE (FRAMEBUFFER_BPP * FRAMEBUFFER_WIDTH)
#define FRAMEBUFFER_SIZE (FRAMEBUFFER_STRIDE * FRAMEBUFFER_HEIGHT)
struct QemuRAMFBCfg {
u64 addr;
u32 fourcc;
u32 flags;
u32 width;
u32 height;
u32 stride;
};
#define fourcc_code(a, b, c, d) ((u32)(a) | ((u32)(b) << 8) | \
((u32)(c) << 16) | ((u32)(d) << 24))
#define DRM_FORMAT_RGB565 fourcc_code('R', 'G', '1', '6') /* [15:0] R:G:B 5:6:5 little endian */
#define DRM_FORMAT_RGB888 fourcc_code('R', 'G', '2', '4') /* [23:0] R:G:B little endian */
#define DRM_FORMAT_XRGB8888 fourcc_code('X', 'R', '2', '4') /* [31:0] x:R:G:B 8:8:8:8 little endian */
static u32
allocate_framebuffer(void)
{
u32 res = allocate_pmm(FRAMEBUFFER_SIZE, 1, 1);
if (!res)
return 0;
dprintf(1, "ramfb: framebuffer allocated at %x\n", res);
return res;
}
int
ramfb_setup(void)
{
dprintf(1, "ramfb: init\n");
if (GET_GLOBAL(HaveRunInit))
return 0;
u32 select = qemu_cfg_find_file("etc/ramfb");
if (select == 0) {
dprintf(1, "ramfb: fw_cfg (etc/ramfb) file not found\n");
return -1;
}
dprintf(1, "ramfb: fw_cfg (etc/ramfb) file at slot 0x%x\n", select);
u32 fb = allocate_framebuffer();
if (!fb) {
dprintf(1, "ramfb: allocating framebuffer failed\n");
return -1;
}
u64 addr = fb;
u8 bpp = FRAMEBUFFER_BPP * 8;
u32 xlines = FRAMEBUFFER_WIDTH;
u32 ylines = FRAMEBUFFER_HEIGHT;
u32 linelength = FRAMEBUFFER_STRIDE;
dprintf(1, "Found FB @ %llx %dx%d with %d bpp (%d stride)\n"
, addr, xlines, ylines, bpp, linelength);
if (!addr || addr > 0xffffffff
|| (bpp != 15 && bpp != 16 && bpp != 24 && bpp != 32)) {
dprintf(1, "Unable to use FB\n");
return -1;
}
cbvga_setup_modes(addr, bpp, xlines, ylines, linelength);
struct QemuRAMFBCfg cfg = {
.addr = cpu_to_be64(fb),
.fourcc = cpu_to_be32(DRM_FORMAT_XRGB8888),
.flags = cpu_to_be32(0),
.width = cpu_to_be32(FRAMEBUFFER_WIDTH),
.height = cpu_to_be32(FRAMEBUFFER_HEIGHT),
.stride = cpu_to_be32(FRAMEBUFFER_STRIDE),
};
qemu_cfg_write_entry(&cfg, select, sizeof(cfg));
return 0;
}

28
vgasrc/vgahw.h
View File

@ -14,7 +14,7 @@ static inline struct vgamode_s *vgahw_find_mode(int mode) {
return clext_find_mode(mode);
if (CONFIG_VGA_BOCHS)
return bochsvga_find_mode(mode);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_find_mode(mode);
return stdvga_find_mode(mode);
}
@ -24,7 +24,7 @@ static inline int vgahw_set_mode(struct vgamode_s *vmode_g, int flags) {
return clext_set_mode(vmode_g, flags);
if (CONFIG_VGA_BOCHS)
return bochsvga_set_mode(vmode_g, flags);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_set_mode(vmode_g, flags);
return stdvga_set_mode(vmode_g, flags);
}
@ -34,7 +34,7 @@ static inline void vgahw_list_modes(u16 seg, u16 *dest, u16 *last) {
clext_list_modes(seg, dest, last);
else if (CONFIG_VGA_BOCHS)
bochsvga_list_modes(seg, dest, last);
else if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
else if (CONFIG_VGA_EMULATE_TEXT)
cbvga_list_modes(seg, dest, last);
else
stdvga_list_modes(seg, dest, last);
@ -51,6 +51,8 @@ static inline int vgahw_setup(void) {
return cbvga_setup();
if (CONFIG_DISPLAY_BOCHS)
return bochs_display_setup();
if (CONFIG_VGA_RAMFB)
return ramfb_setup();
return stdvga_setup();
}
@ -59,7 +61,7 @@ static inline int vgahw_get_window(struct vgamode_s *vmode_g, int window) {
return clext_get_window(vmode_g, window);
if (CONFIG_VGA_BOCHS)
return bochsvga_get_window(vmode_g, window);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_get_window(vmode_g, window);
return stdvga_get_window(vmode_g, window);
}
@ -70,7 +72,7 @@ static inline int vgahw_set_window(struct vgamode_s *vmode_g, int window
return clext_set_window(vmode_g, window, val);
if (CONFIG_VGA_BOCHS)
return bochsvga_set_window(vmode_g, window, val);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_set_window(vmode_g, window, val);
return stdvga_set_window(vmode_g, window, val);
}
@ -80,7 +82,7 @@ static inline int vgahw_get_linelength(struct vgamode_s *vmode_g) {
return clext_get_linelength(vmode_g);
if (CONFIG_VGA_BOCHS)
return bochsvga_get_linelength(vmode_g);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_get_linelength(vmode_g);
return stdvga_get_linelength(vmode_g);
}
@ -90,7 +92,7 @@ static inline int vgahw_set_linelength(struct vgamode_s *vmode_g, int val) {
return clext_set_linelength(vmode_g, val);
if (CONFIG_VGA_BOCHS)
return bochsvga_set_linelength(vmode_g, val);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_set_linelength(vmode_g, val);
return stdvga_set_linelength(vmode_g, val);
}
@ -100,7 +102,7 @@ static inline int vgahw_get_displaystart(struct vgamode_s *vmode_g) {
return clext_get_displaystart(vmode_g);
if (CONFIG_VGA_BOCHS)
return bochsvga_get_displaystart(vmode_g);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_get_displaystart(vmode_g);
return stdvga_get_displaystart(vmode_g);
}
@ -110,7 +112,7 @@ static inline int vgahw_set_displaystart(struct vgamode_s *vmode_g, int val) {
return clext_set_displaystart(vmode_g, val);
if (CONFIG_VGA_BOCHS)
return bochsvga_set_displaystart(vmode_g, val);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_set_displaystart(vmode_g, val);
return stdvga_set_displaystart(vmode_g, val);
}
@ -118,7 +120,7 @@ static inline int vgahw_set_displaystart(struct vgamode_s *vmode_g, int val) {
static inline int vgahw_get_dacformat(struct vgamode_s *vmode_g) {
if (CONFIG_VGA_BOCHS)
return bochsvga_get_dacformat(vmode_g);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_get_dacformat(vmode_g);
return stdvga_get_dacformat(vmode_g);
}
@ -126,7 +128,7 @@ static inline int vgahw_get_dacformat(struct vgamode_s *vmode_g) {
static inline int vgahw_set_dacformat(struct vgamode_s *vmode_g, int val) {
if (CONFIG_VGA_BOCHS)
return bochsvga_set_dacformat(vmode_g, val);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_set_dacformat(vmode_g, val);
return stdvga_set_dacformat(vmode_g, val);
}
@ -136,13 +138,13 @@ static inline int vgahw_save_restore(int cmd, u16 seg, void *data) {
return clext_save_restore(cmd, seg, data);
if (CONFIG_VGA_BOCHS)
return bochsvga_save_restore(cmd, seg, data);
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_save_restore(cmd, seg, data);
return stdvga_save_restore(cmd, seg, data);
}
static inline int vgahw_get_linesize(struct vgamode_s *vmode_g) {
if (CONFIG_VGA_COREBOOT || CONFIG_DISPLAY_BOCHS)
if (CONFIG_VGA_EMULATE_TEXT)
return cbvga_get_linesize(vmode_g);
return stdvga_get_linesize(vmode_g);
}

3
vgasrc/vgautil.h
View File

@ -24,6 +24,9 @@ int cbvga_setup(void);
// bochsdisplay.c
int bochs_display_setup(void);
// ramfb.c
int ramfb_setup(void);
// clext.c
struct vgamode_s *clext_find_mode(int mode);
void clext_list_modes(u16 seg, u16 *dest, u16 *last);