[Qemu-devel] [PATCH] Handle vga= in -append (second try)

["Pascal Terjan" <pterjan@gmail.com>]

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Hello,
vga= is a special parameter that needs to be handled by bootloader so
that the kernel can get it before parsing its command line.
The small attached patch add support for it.

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Index: hw/pc.c
===================================================================
RCS file: /sources/qemu/qemu/hw/pc.c,v
retrieving revision 1.70
diff -u -r1.70 pc.c
--- hw/pc.c	8 Feb 2007 23:09:59 -0000	1.70
+++ hw/pc.c	16 Feb 2007 18:45:10 -0000
@@ -567,6 +567,7 @@
     if (linux_boot) {
         uint8_t bootsect[512];
         uint8_t old_bootsect[512];
+        char *vmode;
 
         if (bs_table[0] == NULL) {
             fprintf(stderr, "A disk image must be given for 'hda' when booting a Linux kernel\n");
@@ -618,6 +619,25 @@
                 KERNEL_CMDLINE_ADDR - KERNEL_PARAMS_ADDR);
         /* loader type */
         stw_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x210, 0x01);
+
+        /* handle vga= parameter */
+        vmode = strstr(kernel_cmdline, "vga=");
+        if (vmode) {
+            char *space;
+            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_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x1fa, video_mode);
+        }
     }
 
     if (pci_enabled) {