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fiasco: add bda support for bootstrap

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Issue #1116
This commit is contained in:
Alexander Boettcher 2014-04-07 11:14:19 +02:00 committed by Christian Helmuth
parent 819e54f860
commit 47b1db6f0a
1 changed files with 25 additions and 0 deletions
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25
base-fiasco/patches/bda.patch
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@ -13,3 +13,28 @@
if ((s = strstr(cmdline, " -comirq="))) if ((s = strstr(cmdline, " -comirq=")))
i = strtoul(s + 9, 0, 0); i = strtoul(s + 9, 0, 0);
--- fiasco/snapshot/l4/pkg/bootstrap/server/src/startup.cc 2008-07-30 13:19:01.000000000 +0200
--- fiasco/snapshot/l4/pkg/bootstrap/server/src/startup.cc 2014-04-07 11:09:34.483037907 +0200
@@ -709,11 +709,21 @@
if (mbi->flags & L4UTIL_MB_CMDLINE)
{
const char *s;
- int comport = 1;
+ int comport = -1;
if ((s = check_arg(L4_CHAR_PTR(mbi->cmdline), "-comport")))
comport = strtoul(s + 9, 0, 0);
+ if (comport == -1) {
+ /* try to read Bios Data Area (BDA) to get comport information */
+ unsigned short comport_count = (*((unsigned short *)0x410) >> 9) & 0x7;
+ if (comport_count)
+ comport = *((unsigned short *)0x400);
+ else
+ /* give up and try default values */
+ comport = 1;
+ }
+
if (check_arg(L4_CHAR_PTR(mbi->cmdline), "-serial"))
com_cons_init(comport);
}