arch/sh/kernel/cpu/sh2a/probe.c

Source file repositories/reference/linux-study-clean/arch/sh/kernel/cpu/sh2a/probe.c

File Facts

System
Linux kernel
Corpus path
arch/sh/kernel/cpu/sh2a/probe.c
Extension
.c
Size
1739 bytes
Lines
58
Domain
Architecture Layer
Bucket
arch/sh
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/kernel/cpu/sh2a/probe.c
 *
 * CPU Subtype Probing for SH-2A.
 *
 * Copyright (C) 2004 - 2007  Paul Mundt
 */
#include <linux/init.h>
#include <asm/processor.h>
#include <asm/cache.h>

void cpu_probe(void)
{
	boot_cpu_data.family			= CPU_FAMILY_SH2A;

	/* All SH-2A CPUs have support for 16 and 32-bit opcodes.. */
	boot_cpu_data.flags			|= CPU_HAS_OP32;

#if defined(CONFIG_CPU_SUBTYPE_SH7201)
	boot_cpu_data.type			= CPU_SH7201;
	boot_cpu_data.flags			|= CPU_HAS_FPU;
#elif defined(CONFIG_CPU_SUBTYPE_SH7203)
	boot_cpu_data.type			= CPU_SH7203;
	boot_cpu_data.flags			|= CPU_HAS_FPU;
#elif defined(CONFIG_CPU_SUBTYPE_SH7263)
	boot_cpu_data.type			= CPU_SH7263;
	boot_cpu_data.flags			|= CPU_HAS_FPU;
#elif defined(CONFIG_CPU_SUBTYPE_SH7264)
	boot_cpu_data.type			= CPU_SH7264;
	boot_cpu_data.flags			|= CPU_HAS_FPU;
#elif defined(CONFIG_CPU_SUBTYPE_SH7269)
	boot_cpu_data.type			= CPU_SH7269;
	boot_cpu_data.flags			|= CPU_HAS_FPU;
#elif defined(CONFIG_CPU_SUBTYPE_SH7206)
	boot_cpu_data.type			= CPU_SH7206;
	boot_cpu_data.flags			|= CPU_HAS_DSP;
#elif defined(CONFIG_CPU_SUBTYPE_MXG)
	boot_cpu_data.type			= CPU_MXG;
	boot_cpu_data.flags			|= CPU_HAS_DSP;
#endif

	boot_cpu_data.dcache.ways		= 4;
	boot_cpu_data.dcache.way_incr		= (1 << 11);
	boot_cpu_data.dcache.sets		= 128;
	boot_cpu_data.dcache.entry_shift	= 4;
	boot_cpu_data.dcache.linesz		= L1_CACHE_BYTES;
	boot_cpu_data.dcache.flags		= 0;

	/*
	 * The icache is the same as the dcache as far as this setup is
	 * concerned. The only real difference in hardware is that the icache
	 * lacks the U bit that the dcache has, none of this has any bearing
	 * on the cache info.
	 */
	boot_cpu_data.icache		= boot_cpu_data.dcache;
}

Annotation

Implementation Notes