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| author | Richard Henderson <rth@twiddle.net> | 2011-04-28 07:29:27 -0700 |
|---|---|---|
| committer | Matt Turner <mattst88@gmail.com> | 2013-11-16 16:33:12 -0800 |
| commit | 994dcf7055df88623d25f3593b931a018a76b502 (patch) | |
| tree | c3708ed5b2558e82b88ef15e533797a400b361e5 /arch/alpha | |
| parent | a47e5bb5764f029f989a182b0dd2d4cce69f8b14 (diff) | |
| download | linux-stable-994dcf7055df88623d25f3593b931a018a76b502.tar.gz linux-stable-994dcf7055df88623d25f3593b931a018a76b502.tar.bz2 linux-stable-994dcf7055df88623d25f3593b931a018a76b502.zip | |
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>
Diffstat (limited to 'arch/alpha')
| -rw-r--r-- | arch/alpha/Kconfig | 14 | ||||
| -rw-r--r-- | arch/alpha/include/asm/machvec.h | 18 | ||||
| -rw-r--r-- | arch/alpha/kernel/setup.c | 13 |
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 |