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Handle vga= in -append 

Here is a patch I had sent twice to the list 2 years ago.
Hopefuly this time someone will be interested

It adds support for passing vga mode to linux kernel through
vga= option in -append

Signed-off-by: Pascal Terjan <pterjan@gmail.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Pascal Terjan 2009-07-13 17:46:42 +02:00 committed by Anthony Liguori
parent 07323531c1
commit bf4e5d9297
1 changed files with 19 additions and 0 deletions
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19
hw/pc.c
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@ -825,6 +825,7 @@ static void load_linux(void *fw_cfg,
uint8_t header[8192];
target_phys_addr_t real_addr, prot_addr, cmdline_addr, initrd_addr = 0;
FILE *f, *fi;
char *vmode;
/* Align to 16 bytes as a paranoia measure */
cmdline_size = (strlen(kernel_cmdline)+16) & ~15;
@ -900,6 +901,24 @@ static void load_linux(void *fw_cfg,
stw_p(header+0x22, cmdline_addr-real_addr);
}
/* handle vga= parameter */
vmode = strstr(kernel_cmdline, "vga=");
if (vmode) {
unsigned int video_mode;
/* skip "vga=" */
vmode += 4;
if (!strncmp(vmode, "normal", 6)) {
video_mode = 0xffff;
} else if (!strncmp(vmode, "ext", 3)) {
video_mode = 0xfffe;
} else if (!strncmp(vmode, "ask", 3)) {
video_mode = 0xfffd;
} else {
video_mode = strtol(vmode, NULL, 0);
}
stw_p(header+0x1fa, video_mode);
}
/* loader type */
/* High nybble = B reserved for Qemu; low nybble is revision number.
If this code is substantially changed, you may want to consider