nios2: Add CDX support
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>
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@ -30,6 +30,7 @@ KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MUL_SUPPORT),-mhw-mul,-mno-hw-mul)
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KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MULX_SUPPORT),-mhw-mulx,-mno-hw-mulx)
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KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_DIV_SUPPORT),-mhw-div,-mno-hw-div)
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KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_BMX_SUPPORT),-mbmx,-mno-bmx)
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KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_CDX_SUPPORT),-mcdx,-mno-cdx)
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KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_FPU_SUPPORT),-mcustom-fpu-cfg=60-1,)
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KBUILD_CFLAGS += -fno-optimize-sibling-calls
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@ -30,6 +30,7 @@ struct cpuinfo {
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bool has_mul;
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bool has_mulx;
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bool has_bmx;
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bool has_cdx;
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/* CPU caches */
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u32 icache_line_size;
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@ -68,6 +68,7 @@ void __init setup_cpuinfo(void)
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cpuinfo.has_mul = of_property_read_bool(cpu, "altr,has-mul");
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cpuinfo.has_mulx = of_property_read_bool(cpu, "altr,has-mulx");
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cpuinfo.has_bmx = of_property_read_bool(cpu, "altr,has-bmx");
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cpuinfo.has_cdx = of_property_read_bool(cpu, "altr,has-cdx");
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cpuinfo.mmu = of_property_read_bool(cpu, "altr,has-mmu");
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if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div)
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@ -82,6 +83,9 @@ void __init setup_cpuinfo(void)
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if (IS_ENABLED(CONFIG_NIOS2_BMX_SUPPORT) && !cpuinfo.has_bmx)
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err_cpu("BMX");
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if (IS_ENABLED(CONFIG_NIOS2_CDX_SUPPORT) && !cpuinfo.has_cdx)
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err_cpu("CDX");
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cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways");
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if (!cpuinfo.tlb_num_ways)
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panic("altr,tlb-num-ways can't be 0. Please check your hardware "
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@ -148,11 +152,13 @@ static int show_cpuinfo(struct seq_file *m, void *v)
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" MUL:\t\t%s\n"
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" MULX:\t\t%s\n"
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" DIV:\t\t%s\n"
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" BMX:\t\t%s\n",
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" BMX:\t\t%s\n"
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" CDX:\t\t%s\n",
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cpuinfo.has_mul ? "yes" : "no",
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cpuinfo.has_mulx ? "yes" : "no",
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cpuinfo.has_div ? "yes" : "no",
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cpuinfo.has_bmx ? "yes" : "no");
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cpuinfo.has_bmx ? "yes" : "no",
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cpuinfo.has_cdx ? "yes" : "no");
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seq_printf(m,
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"Icache:\t\t%ukB, line length: %u\n",
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@ -90,6 +90,15 @@ config NIOS2_BMX_SUPPORT
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the BMX Bit Manipulation Extension instructions. Enables
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the -mbmx compiler flag.
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config NIOS2_CDX_SUPPORT
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bool "Enable CDX instructions"
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depends on NIOS2_ARCH_REVISION = 2
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default n
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help
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Set to true if you configured the Nios II R2 to include
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the CDX Bit Manipulation Extension instructions. Enables
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the -mcdx compiler flag.
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config NIOS2_FPU_SUPPORT
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bool "Custom floating point instr support"
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default n
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