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https://github.com/genodelabs/genode.git
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71 lines
1.8 KiB
Diff
71 lines
1.8 KiB
Diff
diff --git a/kernel/kdb/platform/pc99/io.cc b/kernel/kdb/platform/pc99/io.cc
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index 9dedf7a..0a70b23 100644
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--- a/kernel/kdb/platform/pc99/io.cc
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+++ b/kernel/kdb/platform/pc99/io.cc
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@@ -299,17 +299,23 @@ static char getc_screen (bool block)
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**
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*/
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+static unsigned short comport = COMPORT;
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static void init_serial (void)
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{
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-#define IER (COMPORT+1)
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-#define EIR (COMPORT+2)
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-#define LCR (COMPORT+3)
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-#define MCR (COMPORT+4)
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-#define LSR (COMPORT+5)
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-#define MSR (COMPORT+6)
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-#define DLLO (COMPORT+0)
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-#define DLHI (COMPORT+1)
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+ /* read BDA region to obtain I/O ports of serial device */
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+ unsigned short comport_count = (*((unsigned short *)0x410) >> 9) & 0x7;
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+ if (comport_count)
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+ comport = *((unsigned short *)0x400);
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+
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+#define IER (comport+1)
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+#define EIR (comport+2)
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+#define LCR (comport+3)
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+#define MCR (comport+4)
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+#define LSR (comport+5)
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+#define MSR (comport+6)
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+#define DLLO (comport+0)
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+#define DLHI (comport+1)
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out_u8(LCR, 0x80); /* select bank 1 */
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for (volatile int i = 10000000; i--; );
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@@ -326,13 +332,14 @@ static void init_serial (void)
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in_u8(MCR);
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in_u8(LSR);
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in_u8(MSR);
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+
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}
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static void putc_serial (const char c)
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{
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while ((in_u8(LSR) & 0x20) == 0);
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- out_u8(COMPORT,c);
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+ out_u8(comport,c);
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while ((in_u8(LSR) & 0x40) == 0);
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if (c == '\n')
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putc_serial('\r');
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@@ -357,7 +364,7 @@ static char getc_serial (bool block)
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getc_blocked = false;
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}
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- return in_u8(COMPORT);
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+ return in_u8(comport);
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}
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#if defined(CONFIG_KDB_BREAKIN)
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@@ -381,7 +388,7 @@ void kdebug_check_breakin (void)
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}
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#endif
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#if defined(CONFIG_KDB_BREAKIN_ESCAPE)
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- if ((c & 0x01) && (in_u8(COMPORT) == 0x1b))
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+ if ((c & 0x01) && (in_u8(comport) == 0x1b))
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enter_kdebug("breakin");
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#endif
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return;
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