arch/m68k/kernel/setup_mm.c

Source file repositories/reference/linux-study-clean/arch/m68k/kernel/setup_mm.c

File Facts

System
Linux kernel
Corpus path
arch/m68k/kernel/setup_mm.c
Extension
.c
Size
13929 bytes
Lines
608
Domain
Architecture Layer
Bucket
arch/m68k
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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

module_init(proc_hardware_init);
#endif

void __init arch_cpu_finalize_init(void)
{
#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
	if (m68k_fputype == 0) {
		pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
			"WHICH IS REQUIRED BY LINUX/M68K ***\n");
		pr_emerg("Upgrade your hardware or join the FPU "
			"emulation project\n");
		panic("no FPU");
	}
#endif /* !CONFIG_M68KFPU_EMU */
}

#ifdef CONFIG_ADB
static int __init adb_probe_sync_enable (char *str) {
	extern int __adb_probe_sync;
	__adb_probe_sync = 1;
	return 1;
}

__setup("adb_sync", adb_probe_sync_enable);
#endif /* CONFIG_ADB */

#if IS_ENABLED(CONFIG_NVRAM)
#ifdef CONFIG_MAC
static unsigned char m68k_nvram_read_byte(int addr)
{
	if (MACH_IS_MAC)
		return mac_pram_read_byte(addr);
	return 0xff;
}

static void m68k_nvram_write_byte(unsigned char val, int addr)
{
	if (MACH_IS_MAC)
		mac_pram_write_byte(val, addr);
}
#endif /* CONFIG_MAC */

#ifdef CONFIG_ATARI
static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
{
	if (MACH_IS_ATARI)
		return atari_nvram_read(buf, count, ppos);
	else if (MACH_IS_MAC)
		return nvram_read_bytes(buf, count, ppos);
	return -EINVAL;
}

static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
{
	if (MACH_IS_ATARI)
		return atari_nvram_write(buf, count, ppos);
	else if (MACH_IS_MAC)
		return nvram_write_bytes(buf, count, ppos);
	return -EINVAL;
}

static long m68k_nvram_set_checksum(void)
{
	if (MACH_IS_ATARI)
		return atari_nvram_set_checksum();
	return -EINVAL;
}

static long m68k_nvram_initialize(void)
{
	if (MACH_IS_ATARI)
		return atari_nvram_initialize();
	return -EINVAL;
}
#endif /* CONFIG_ATARI */

static ssize_t m68k_nvram_get_size(void)
{
	if (MACH_IS_ATARI)
		return atari_nvram_get_size();
	else if (MACH_IS_MAC)
		return mac_pram_get_size();
	return -ENODEV;
}

/* Atari device drivers call .read (to get checksum validation) whereas
 * Mac and PowerMac device drivers just use .read_byte.
 */
const struct nvram_ops arch_nvram_ops = {
#ifdef CONFIG_MAC

Annotation

Implementation Notes