From 5716be53d3dd4f1a27ebcab9b36d32f96283b793 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 4 Jan 2024 08:10:39 -0700 Subject: [PATCH] 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 Reviewed-by: Tom Rini Suggested-by: Bin Meng --- arch/x86/Kconfig | 8 ++++++++ arch/x86/config.mk | 4 ++++ arch/x86/cpu/x86_64/cpu.c | 12 ++++++++++++ drivers/video/Kconfig | 1 + 4 files changed, 25 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 99e59d94c6..6b532d712e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -723,6 +723,14 @@ config ROM_TABLE_SIZE hex default 0x10000 +config X86_HARDFP + bool "Support hardware floating point" + help + U-Boot generally does not make use of floating point. Where this is + needed, it can be enabled using this option. This adjusts the + start-up code for 64-bit mode and changes the compiler options for + 64-bit to enable SSE. + config HAVE_ITSS bool "Enable ITSS" help diff --git a/arch/x86/config.mk b/arch/x86/config.mk index 26ec1af2f0..2e3a7119e7 100644 --- a/arch/x86/config.mk +++ b/arch/x86/config.mk @@ -27,9 +27,13 @@ ifeq ($(IS_32BIT),y) PLATFORM_CPPFLAGS += -march=i386 -m32 else PLATFORM_CPPFLAGS += $(if $(CONFIG_SPL_BUILD),,-fpic) -fno-common -march=core2 -m64 + +ifndef CONFIG_X86_HARDFP PLATFORM_CPPFLAGS += -mno-mmx -mno-sse endif +endif # IS_32BIT + PLATFORM_RELFLAGS += -fdata-sections -ffunction-sections -fvisibility=hidden KBUILD_LDFLAGS += -Bsymbolic -Bsymbolic-functions diff --git a/arch/x86/cpu/x86_64/cpu.c b/arch/x86/cpu/x86_64/cpu.c index 2647bff891..5ea746ecce 100644 --- a/arch/x86/cpu/x86_64/cpu.c +++ b/arch/x86/cpu/x86_64/cpu.c @@ -10,6 +10,7 @@ #include #include #include +#include DECLARE_GLOBAL_DATA_PTR; @@ -39,11 +40,22 @@ int x86_mp_init(void) 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; } diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 6f319ba0d5..39c82521be 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -180,6 +180,7 @@ config CONSOLE_ROTATION config CONSOLE_TRUETYPE bool "Support a console that uses TrueType fonts" + select X86_HARDFP if X86 help TrueTrype fonts can provide outline-drawing capability rather than needing to provide a bitmap for each font and size that is needed. -- 2.39.5