boot/arch/arm: disable FPU initialization on bootloader start

Change-Id: Idd71940d22a9004e93f613899725d299a7932d8c Reviewed-on: https://review.haiku-os.org/c/haiku/+/4702 Tested-by: Commit checker robot <[email protected]> Reviewed-by: Fredrik Holmqvist <[email protected]> Reviewed-by: Adrien Destugues <[email protected]>
2021-12-02 08:07:42 +00:00
parent d1f10fcef9
commit 8a18d81d7a
1 changed files with 0 additions and 20 deletions
@@ -81,26 +81,6 @@ check_cpu_features()
 			break;
 	}
 	// We could check for VFP/NEON support here, but for the moment we only
 	// really target ARM CPU's with VFP/NEON built-in (cortex-a7+)
 	if (arch >= ARCH_ARM_v7)
 	{
 		// Enable VFP/NEON. We HAVE to do this before the trace call below,
 		// which is the first time we call vprintf. Otherwise, it will crash
 		// when trying to push floating point registers on the stack.
 		asm volatile(
 		"	MRC p15, #0, r1, c1, c0, #2\n" // r1 = Access Control Register
 		"	ORR r1, r1, #(0xf << 20)\n" // enable full access for p10,11
 		"	MCR p15, #0, r1, c1, c0, #2\n" // Access Control Register = r1
 		"	MOV r1, #0\n"
 		"	MCR p15, #0, r1, c7, c5, #4\n" // flush prefetch buffer because of
 			// FMXR below and CP 10 & 11 were only just enabled
 		"	MOV r0,#0x40000000	\n" // Enable VFP itself
 		"	FMXR FPEXC, r0" //FPEXC = r0
 		:::"r0", "r1");
 	}
 	TRACE(("%s: implementor=0x%x('%c'), arch=%d, variant=0x%x, part=0x%x, revision=0x%x\n",
 		__func__, implementor, implementor, arch, variant, part, revision));