[Qemu-devel] [PATCH 2/2] qemu: bios: Make boot prompt optional

[Jan Kiszka <jan.kiszka@siemens.com>]

[ note: applies on top of qemu's current patch series ]

Check via QEMU's firmware configuration interface if the boot prompt
should be given. This allows to disable the prompt with its several
seconds long delay, speeding up the common boot case.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

 bios/rombios.c   |   19 +++++++++++++++++++
 bios/rombios.h   |   10 ++++++++++
 bios/rombios32.c |    9 ---------
 3 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/bios/rombios.c b/bios/rombios.c
index 0f13b53..3b7a5f0 100644
--- a/bios/rombios.c
+++ b/bios/rombios.c
@@ -2015,6 +2015,21 @@ Bit16u i; ipl_entry_t *e;
 }

 #if BX_ELTORITO_BOOT
+#ifdef BX_QEMU
+int
+qemu_cfg_probe_bootkey()
+{
+  outw(QEMU_CFG_CTL_PORT, QEMU_CFG_SIGNATURE);
+  if (inb(QEMU_CFG_DATA_PORT) != 'Q' ||
+      inb(QEMU_CFG_DATA_PORT) != 'E' ||
+      inb(QEMU_CFG_DATA_PORT) != 'M' ||
+      inb(QEMU_CFG_DATA_PORT) != 'U') return 1;
+
+  outw(QEMU_CFG_CTL_PORT, QEMU_CFG_BOOT_INTERACTIVE);
+  return inb(QEMU_CFG_DATA_PORT);
+}
+#endif // BX_QEMU
+
   void
 interactive_bootkey()
 {
@@ -2026,6 +2041,10 @@ interactive_bootkey()
   Bit16u ss = get_SS();
   Bit16u valid_choice = 0;

+#ifdef BX_QEMU
+  if (!qemu_cfg_probe_bootkey()) return;
+#endif
+
   while (check_for_keystroke())
     get_keystroke();

diff --git a/bios/rombios.h b/bios/rombios.h
index 6f9cbb1..f02303c 100644
--- a/bios/rombios.h
+++ b/bios/rombios.h
@@ -58,6 +58,16 @@
 #define SMB_IO_BASE       0xb100
 #define SMP_MSR_ADDR      0x0510

+#define QEMU_CFG_CTL_PORT         0x510
+#define QEMU_CFG_DATA_PORT        0x511
+#define QEMU_CFG_SIGNATURE        0x00
+#define QEMU_CFG_ID               0x01
+#define QEMU_CFG_UUID             0x02
+#define QEMU_CFG_BOOT_INTERACTIVE 0x0d
+#define QEMU_CFG_ARCH_LOCAL       0x8000
+#define QEMU_CFG_ACPI_TABLES      (QEMU_CFG_ARCH_LOCAL + 0)
+#define QEMU_CFG_SMBIOS_ENTRIES   (QEMU_CFG_ARCH_LOCAL + 1)
+
   // Define the application NAME
 #if defined(BX_QEMU)
 #  define BX_APPNAME "QEMU"
diff --git a/bios/rombios32.c b/bios/rombios32.c
index 49dfd62..17dcb11 100644
--- a/bios/rombios32.c
+++ b/bios/rombios32.c
@@ -463,15 +463,6 @@ void wrmsr_smp(uint32_t index, uint64_t val)
 }

 #ifdef BX_QEMU
-#define QEMU_CFG_CTL_PORT 0x510
-#define QEMU_CFG_DATA_PORT 0x511
-#define QEMU_CFG_SIGNATURE  0x00
-#define QEMU_CFG_ID         0x01
-#define QEMU_CFG_UUID       0x02
-#define QEMU_CFG_ARCH_LOCAL     0x8000
-#define QEMU_CFG_ACPI_TABLES  (QEMU_CFG_ARCH_LOCAL + 0)
-#define QEMU_CFG_SMBIOS_ENTRIES  (QEMU_CFG_ARCH_LOCAL + 1)
-
 int qemu_cfg_port;

 void qemu_cfg_select(int f)