Only available if threads are disabled. Only displays after the console
has been loaded and from within 32bit flat regions of code.
Signed-off-by: Karl Semich <0xl...@gmail.com>
---
src/Kconfig | 9 +++++++++
src/bootsplash.c | 9 +++++++++
src/output.c | 32 +++++++++++++++++++++++++-------
src/util.h | 1 +
4 files changed, 44 insertions(+), 7 deletions(-)
diff --git a/src/Kconfig b/src/Kconfig
index 3a8ffa1..5d2c7ab 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -571,6 +571,15 @@ menu "Debugging"
provide the 32 bit address. E.g. 0xFEDC6000 for the AMD Kern
(a.k.a Hudson UART).
+ config DEBUG_VGA_CONSOLE
+ depends on DEBUG_LEVEL != 0 && !THREADS
+ bool "VGA console debugging"
+ default y
+ help
+ Send debugging information to vga console. This is only displayed
+ after the VGA console has loaded, and only in 32 bit flat regions
+ of code. Requires that threads are disabled.
+
config DEBUG_IO
depends on QEMU_HARDWARE && DEBUG_LEVEL != 0
bool "Special IO port debugging"
diff --git a/src/bootsplash.c b/src/bootsplash.c
index 538b316..2a93c8a 100644
--- a/src/bootsplash.c
+++ b/src/bootsplash.c
@@ -36,6 +36,8 @@ call16_int10(struct bregs *br)
* VGA text / graphics console
****************************************************************/
+static int VgaConsoleActive = 0;
+
void
enable_vga_console(void)
{
@@ -47,11 +49,18 @@ enable_vga_console(void)
br.ax = 0x0003;
call16_int10(&br);
+ VgaConsoleActive = 1;
+
// Write to screen.
printf("SeaBIOS (version %s)\n", VERSION);
display_uuid();
}
+int vga_console_active(void)
+{
+ return VgaConsoleActive;
+}
+
static int
find_videomode(struct vbe_info *vesa_info, struct vbe_mode_info *mode_info
, int width, int height, int bpp_req)
diff --git a/src/output.c b/src/output.c
index 0184444..27935bc 100644
--- a/src/output.c
+++ b/src/output.c
@@ -17,12 +17,15 @@
#include "output.h" // dprintf
#include "stacks.h" // call16_int
#include "string.h" // memset
-#include "util.h" // ScreenAndDebug
+#include "util.h" // ScreenAndDebug vga_console_active
struct putcinfo {
void (*func)(struct putcinfo *info, char c);
};
+static void __debug_putc(char c);
+static void __screen_putc(char c);
+
/****************************************************************
* Debug output
@@ -35,9 +38,8 @@ debug_banner(void)
dprintf(1, "BUILD: %s\n", BUILDINFO);
}
-// Write a character to debug port(s).
static void
-debug_putc(struct putcinfo *action, char c)
+__debug_putc(char c)
{
if (! CONFIG_DEBUG_LEVEL)
return;
@@ -47,6 +49,16 @@ debug_putc(struct putcinfo *action, char c)
serial_debug_putc(c);
}
+// Write a character to debug port(s).
+static void
+debug_putc(struct putcinfo *action, char c)
+{
+ __debug_putc(c);
+ if (CONFIG_DEBUG_LEVEL && CONFIG_DEBUG_VGA_CONSOLE && !MODESEGMENT
+ && vga_console_active())
+ __screen_putc(c);
+}
+
// Flush any pending output to debug port(s).
static void
debug_flush(void)
@@ -86,17 +98,23 @@ screenc(char c)
call16_int(0x10, &br);
}
-// Handle a character from a printf request.
static void
-screen_putc(struct putcinfo *action, char c)
+__screen_putc(char c)
{
- if (ScreenAndDebug)
- debug_putc(&debuginfo, c);
if (c == '\n')
screenc('\r');
screenc(c);
}
+// Handle a character from a printf request.
+static void
+screen_putc(struct putcinfo *action, char c)
+{
+ if (ScreenAndDebug)
+ __debug_putc(c);
+ __screen_putc(c);
+}
+
static struct putcinfo screeninfo = { screen_putc };
diff --git a/src/util.h b/src/util.h
index aff8e88..8219e0c 100644
--- a/src/util.h
+++ b/src/util.h
@@ -50,6 +50,7 @@ int boot_lchs_find_ata_device(struct pci_device *pci, int
chanid, int slave,
// bootsplash.c
void enable_vga_console(void);
+int vga_console_active(void);
void enable_bootsplash(void);
void disable_bootsplash(void);
--
2.32.0
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