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arch/x86: Add palette 256 color to qemu-i486 VGA driver
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This patch adds support to get the VGA driver working with 256
colors.

Signed-off-by: Alan C. Assis <acassis@gmail.com>
This commit is contained in:
Alan Carvalho de Assis
2026-05-01 09:00:26 -03:00
committed by Matteo Golin
parent b30fe55fe0
commit 63a03d0f8a
1 changed files with 41 additions and 19 deletions
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arch/x86/src/qemu/qemu_vga.c
+41 -19
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@@ -204,9 +204,6 @@ static const uint8_t height_600[] =
0x70, 0xf0, 0x60, 0x5b, 0x8c, 0x57, 0x58, 0x70
};
static const uint8_t g_bg_color = 0x0f;
static const uint8_t g_fg_color = 0x01;
static uint8_t g_runbuffer[VGA_XRES];
static uint8_t *g_pscreen = (uint8_t *)(0xa0000);
@@ -238,6 +235,43 @@ static const struct file_operations g_vgaops =
* Private Functions
****************************************************************************/
static void vga_init_palette(void)
{
uint8_t r3;
uint8_t g3;
uint8_t b2;
static const uint8_t r_levels[8] =
{
0, 9, 18, 27, 36, 45, 54, 63
};
static const uint8_t g_levels[8] =
{
0, 9, 18, 27, 36, 45, 54, 63
};
static const uint8_t b_levels[4] =
{
0, 21, 42, 63
};
outb(0x00, 0x3c8);
for (r3 = 0; r3 < 8; r3++)
{
for (g3 = 0; g3 < 8; g3++)
{
for (b2 = 0; b2 < 4; b2++)
{
outb(r_levels[r3], 0x3c9);
outb(g_levels[g3], 0x3c9);
outb(b_levels[b2], 0x3c9);
}
}
}
}
/* The chain4 parameter should be 1 for normal 13h-type mode, but
* only allows 320x200 256x200, 256x240 and 256x256 because you
* can only access the first 64kb
@@ -388,19 +422,9 @@ static int init_graph_vga(int width, int height, int chain4)
outw(0x4005, 0x3ce); /* 256 color mode */
outw(0x0106, 0x3ce); /* Extend graph mode & a000-bfff */
inb(0x3da);
outb(0x30, 0x3c0);
outb(0x41, 0x3c0);
outb(0x33, 0x3c0);
outb(0x00, 0x3c0);
/* Setup the palette to RGB332 used by NuttX, LVGL, etc */
for (a = 0; a < 16; a++) /* ega pal */
{
outb((uint8_t)a, 0x3c0);
outb((uint8_t)a, 0x3c0);
}
outb(0x20, 0x3c0); /* enable video */
vga_init_palette();
return 0;
}
@@ -476,16 +500,15 @@ static ssize_t vga_write(struct file *filep, const char *buf,
size_t buflen)
{
int i;
int j;
if (buf == NULL || buflen < 1)
{
return -EINVAL;
}
for (j = 0; j < buflen && g_curpos < VGA_FBSIZE; j++)
for (i = 0; i < buflen && g_curpos < VGA_FBSIZE; i++)
{
g_pscreen[g_curpos++] = (uint8_t)buf[j];
g_pscreen[g_curpos++] = (uint8_t)buf[i];
}
return buflen;
@@ -565,7 +588,6 @@ int qemu_vga(void)
return ret;
}
memset(g_pscreen, g_bg_color, VGA_XRES * VGA_YRES);
register_driver("/dev/lcd", &g_vgaops, 0666, NULL);
return OK;