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x86: Enable SSE in 64-bit mode

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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>
This commit is contained in:
Simon Glass 2024-01-04 08:10:39 -07:00 committed by Tom Rini
parent a469c8e854
commit 5716be53d3
4 changed files with 25 additions and 0 deletions
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8
arch/x86/Kconfig
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@ -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

4
arch/x86/config.mk
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@ -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

12
arch/x86/cpu/x86_64/cpu.c
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@ -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 @@ 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;
}

1
drivers/video/Kconfig
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@ -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.