From bf4e5d92979c5f7b0b5e5d0a261954aa87f02ac1 Mon Sep 17 00:00:00 2001 From: Pascal Terjan Date: Mon, 13 Jul 2009 17:46:42 +0200 Subject: 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 Signed-off-by: Anthony Liguori --- hw/pc.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'hw') diff --git a/hw/pc.c b/hw/pc.c index de23fa7f6e..b47c95d72a 100644 --- a/hw/pc.c +++ b/hw/pc.c @@ -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 -- cgit v1.2.1