alpha: Notice if we're being run under QEMU

When building a generic kernel, do a run-time check on the serial
number, like we do for MILO.  When building a custom kernel, make
this a configure-time check.

Signed-off-by: Richard Henderson <rth@twiddle.net>

3 files changed, 38 insertions, 7 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 135c674eaf9e..51cc8c353164 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -488,6 +488,20 @@ config VGA_HOSE
           which always have multiple hoses, and whose consoles support it.
 
 
+config ALPHA_QEMU
+        bool "Run under QEMU emulation"
+        depends on !ALPHA_GENERIC
+        ---help---
+          Assume the presence of special features supported by QEMU PALcode
+          that reduce the overhead of system emulation.
+
+          Generic kernels will auto-detect QEMU.  But when building a
+          system-specific kernel, the assumption is that we want to
+          elimiate as many runtime tests as possible.
+
+          If unsure, say N.
+
+
 config ALPHA_SRM
         bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
         depends on TTY
diff --git a/arch/alpha/include/asm/machvec.h b/arch/alpha/include/asm/machvec.h
index 72dbf2359270..4ac90167d346 100644
--- a/arch/alpha/include/asm/machvec.h
+++ b/arch/alpha/include/asm/machvec.h
@@ -126,13 +126,19 @@ extern struct alpha_machine_vector alpha_mv;
 
 #ifdef CONFIG_ALPHA_GENERIC
 extern int alpha_using_srm;
+extern int alpha_using_qemu;
 #else
-#ifdef CONFIG_ALPHA_SRM
-#define alpha_using_srm 1
-#else
-#define alpha_using_srm 0
-#endif
+# ifdef CONFIG_ALPHA_SRM
+#  define alpha_using_srm 1
+# else
+#  define alpha_using_srm 0
+# endif
+# ifdef CONFIG_ALPHA_QEMU
+#  define alpha_using_qemu 1
+# else
+#  define alpha_using_qemu 0
+# endif
 #endif /* GENERIC */
 
-#endif
+#endif /* __KERNEL__ */
 #endif /* __ALPHA_MACHVEC_H */
diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index 9e3107cc5ebb..c38d6a1b9066 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -115,10 +115,17 @@ unsigned long alpha_agpgart_size = DEFAULT_AGP_APER_SIZE;
 
 #ifdef CONFIG_ALPHA_GENERIC
 struct alpha_machine_vector alpha_mv;
+#endif
+
+#ifndef alpha_using_srm
 int alpha_using_srm;
 EXPORT_SYMBOL(alpha_using_srm);
 #endif
 
+#ifndef alpha_using_qemu
+int alpha_using_qemu;
+#endif
+
 static struct alpha_machine_vector *get_sysvec(unsigned long, unsigned long,
                                                unsigned long);
 static struct alpha_machine_vector *get_sysvec_byname(const char *);
@@ -529,11 +536,15 @@ setup_arch(char **cmdline_p)
         atomic_notifier_chain_register(&panic_notifier_list,
                         &alpha_panic_block);
 
-#ifdef CONFIG_ALPHA_GENERIC
+#ifndef alpha_using_srm
         /* Assume that we've booted from SRM if we haven't booted from MILO.
            Detect the later by looking for "MILO" in the system serial nr.  */
         alpha_using_srm = strncmp((const char *)hwrpb->ssn, "MILO", 4) != 0;
 #endif
+#ifndef alpha_using_qemu
+        /* Similarly, look for QEMU.  */
+        alpha_using_qemu = strstr((const char *)hwrpb->ssn, "QEMU") != 0;
+#endif
 
         /* If we are using SRM, we want to allow callbacks
            as early as possible, so do this NOW, and then