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nds32: nds32 FPU port

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This patch set contains basic components for supporting the nds32 FPU,
such as exception handlers and context switch for FPU registers. By
default, the lazy FPU scheme is supported and the user can configure it via
CONFIG_LZAY_FPU.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
This commit is contained in:
Vincent Chen
2018-11-22 11:14:34 +08:00
committed by Greentime Hu
parent 4f014a41b4
commit e46bf83c18
17 changed files with 589 additions and 16 deletions
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12
arch/nds32/kernel/setup.c
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@@ -15,6 +15,7 @@
#include <asm/proc-fns.h>
#include <asm/cache_info.h>
#include <asm/elf.h>
#include <asm/fpu.h>
#include <nds32_intrinsic.h>
#define HWCAP_MFUSR_PC 0x000001
@@ -40,6 +41,7 @@
#define HWCAP_DX_REGS 0x100000
unsigned long cpu_id, cpu_rev, cpu_cfgid;
bool has_fpu = false;
char cpu_series;
char *endianness = NULL;
@@ -136,6 +138,11 @@ static void __init dump_cpu_info(int cpu)
(aliasing_num - 1) << PAGE_SHIFT;
}
#endif
#ifdef CONFIG_FPU
/* Disable fpu and enable when it is used. */
if (has_fpu)
disable_fpu();
#endif
}
static void __init setup_cpuinfo(void)
@@ -180,9 +187,10 @@ static void __init setup_cpuinfo(void)
if (cpu_cfgid & 0x0004)
elf_hwcap |= HWCAP_EXT2;
if (cpu_cfgid & 0x0008)
if (cpu_cfgid & 0x0008) {
elf_hwcap |= HWCAP_FPU;
has_fpu = true;
}
if (cpu_cfgid & 0x0010)
elf_hwcap |= HWCAP_STRING;