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qemu/target-arm
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Andrew Towers 06ed5d66f7 ARM: Permit any ARMv6K CPU to read the MVFR0 and MVFR1 VFP registers. 
This patch replaces the ARM_FEATURE_VFP3 test when reading MVFR registers
with a test for a new feature flag ARM_FEATURE_MVFR, and sets this feature
for all ARMv6K cores (ARM1156 is not a v6K core, yet supports MVFR; qemu
does not support ARM1156 at this time.)

MVFR0 and MVFR1 were introduced in ARM1136JF-S r1p0 (ARMv6K, VFPv2) and are
present in ARM1156T2F-S (non-v6K), ARM1176JZF-S, ARM11MPCore and newer cores.
Reference: ARM DDI 0211H, 0290G, 0301H, 0360E.
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0211h/Ffbefjag.html

Without this change, the linux kernel will not boot with VFP support enabled
under ARM1176 system emulation, due to the unconditional use of MVFR1 at the
end of vfp_init() in arch/arm/vfp/vfpmodule.c:

  VFP support v0.3: implemetor 41 architecture 1 part 20 variant b rev 5
  Internal error: Oops - undefined instruction: 0 [#1]

Signed-off-by: Andrew Towers <atowers@gmail.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2012-03-30 10:10:49 +00:00
..
cpu-qom.h target-arm: Minimalistic CPU QOM'ification 2012-03-29 15:42:50 +00:00
cpu.c target-arm: Minimalistic CPU QOM'ification 2012-03-29 15:42:50 +00:00
cpu.h ARM: Permit any ARMv6K CPU to read the MVFR0 and MVFR1 VFP registers. 2012-03-30 10:10:49 +00:00
helper.c ARM: Permit any ARMv6K CPU to read the MVFR0 and MVFR1 VFP registers. 2012-03-30 10:10:49 +00:00
helper.h target-arm: Implement VFPv4 fused multiply-accumulate insns 2011-10-19 16:14:07 +00:00
iwmmxt_helper.c target-arm: Don't overuse CPUState 2012-03-14 22:20:24 +01:00
machine.c arm: Add dummy support for co-processor 15's secure config register 2012-01-13 17:25:08 +00:00
neon_helper.c target-arm: Don't overuse CPUState 2012-03-14 22:20:24 +01:00
op_addsub.h Correct spelling of licensed 2011-07-23 11:26:12 -05:00
op_helper.c target-arm: Don't overuse CPUState 2012-03-14 22:20:24 +01:00
translate.c ARM: Permit any ARMv6K CPU to read the MVFR0 and MVFR1 VFP registers. 2012-03-30 10:10:49 +00:00