x86: Enable SSE in 64-bit mode
This is needed to support Truetype fonts. In any case, the compiler
expects SSE to be available in 64-bit mode. Provide an option to enable
SSE so that hardware floating-point arithmetic works.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Suggested-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/x86_64/cpu.c b/arch/x86/cpu/x86_64/cpu.c
index 2647bff..5ea746e 100644
--- a/arch/x86/cpu/x86_64/cpu.c
+++ b/arch/x86/cpu/x86_64/cpu.c
@@ -10,6 +10,7 @@
#include <init.h>
#include <asm/cpu.h>
#include <asm/global_data.h>
+#include <asm/processor-flags.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -39,11 +40,22 @@
return 0;
}
+/* enable SSE features for hardware floating point */
+static void setup_sse_features(void)
+{
+ asm ("mov %%cr4, %%rax\n" \
+ "or %0, %%rax\n" \
+ "mov %%rax, %%cr4\n" \
+ : : "i" (X86_CR4_OSFXSR | X86_CR4_OSXMMEXCPT) : "eax");
+}
+
int x86_cpu_reinit_f(void)
{
/* set the vendor to Intel so that native_calibrate_tsc() works */
gd->arch.x86_vendor = X86_VENDOR_INTEL;
gd->arch.has_mtrr = true;
+ if (IS_ENABLED(CONFIG_X86_HARDFP))
+ setup_sse_features();
return 0;
}