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nios2: Add CDX support

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Add support for the CDX Code Density Extensions present in
Nios II R2 . This introduces new 16bit instruction set to
improve code density while retaining support for the 32bit
Nios II R2 instructions.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>
This commit is contained in:
Marek Vasut 2017-04-19 13:19:02 +02:00 committed by Ley Foon Tan
parent 23460839b9
commit edebea9877
4 changed files with 19 additions and 2 deletions
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1
arch/nios2/Makefile
View File

@ -30,6 +30,7 @@ KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MUL_SUPPORT),-mhw-mul,-mno-hw-mul)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MULX_SUPPORT),-mhw-mulx,-mno-hw-mulx)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_DIV_SUPPORT),-mhw-div,-mno-hw-div)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_BMX_SUPPORT),-mbmx,-mno-bmx)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_CDX_SUPPORT),-mcdx,-mno-cdx)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_FPU_SUPPORT),-mcustom-fpu-cfg=60-1,)
KBUILD_CFLAGS += -fno-optimize-sibling-calls

1
arch/nios2/include/asm/cpuinfo.h
View File

@ -30,6 +30,7 @@ struct cpuinfo {
bool has_mul;
bool has_mulx;
bool has_bmx;
bool has_cdx;
/* CPU caches */
u32 icache_line_size;

10
arch/nios2/kernel/cpuinfo.c
View File

@ -68,6 +68,7 @@ void __init setup_cpuinfo(void)
cpuinfo.has_mul = of_property_read_bool(cpu, "altr,has-mul");
cpuinfo.has_mulx = of_property_read_bool(cpu, "altr,has-mulx");
cpuinfo.has_bmx = of_property_read_bool(cpu, "altr,has-bmx");
cpuinfo.has_cdx = of_property_read_bool(cpu, "altr,has-cdx");
cpuinfo.mmu = of_property_read_bool(cpu, "altr,has-mmu");
if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div)
@ -82,6 +83,9 @@ void __init setup_cpuinfo(void)
if (IS_ENABLED(CONFIG_NIOS2_BMX_SUPPORT) && !cpuinfo.has_bmx)
err_cpu("BMX");
if (IS_ENABLED(CONFIG_NIOS2_CDX_SUPPORT) && !cpuinfo.has_cdx)
err_cpu("CDX");
cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways");
if (!cpuinfo.tlb_num_ways)
panic("altr,tlb-num-ways can't be 0. Please check your hardware "
@ -148,11 +152,13 @@ static int show_cpuinfo(struct seq_file *m, void *v)
" MUL:\t\t%s\n"
" MULX:\t\t%s\n"
" DIV:\t\t%s\n"
" BMX:\t\t%s\n",
" BMX:\t\t%s\n"
" CDX:\t\t%s\n",
cpuinfo.has_mul ? "yes" : "no",
cpuinfo.has_mulx ? "yes" : "no",
cpuinfo.has_div ? "yes" : "no",
cpuinfo.has_bmx ? "yes" : "no");
cpuinfo.has_bmx ? "yes" : "no",
cpuinfo.has_cdx ? "yes" : "no");
seq_printf(m,
"Icache:\t\t%ukB, line length: %u\n",

9
arch/nios2/platform/Kconfig.platform
View File

@ -90,6 +90,15 @@ config NIOS2_BMX_SUPPORT
the BMX Bit Manipulation Extension instructions. Enables
the -mbmx compiler flag.
config NIOS2_CDX_SUPPORT
bool "Enable CDX instructions"
depends on NIOS2_ARCH_REVISION = 2
default n
help
Set to true if you configured the Nios II R2 to include
the CDX Bit Manipulation Extension instructions. Enables
the -mcdx compiler flag.
config NIOS2_FPU_SUPPORT
bool "Custom floating point instr support"
default n