arch/mips/alchemy/common/prom.c

Source file repositories/reference/linux-study-clean/arch/mips/alchemy/common/prom.c

File Facts

System
Linux kernel
Corpus path
arch/mips/alchemy/common/prom.c
Extension
.c
Size
3842 bytes
Lines
147
Domain
Architecture Layer
Bucket
arch/mips
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

if (yamon) {
			if (strcmp(envname, *env++) == 0)
				return *env;
		} else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
			return *env + i + 1;
		env++;
	}

	return NULL;
}

void __init prom_init(void)
{
	unsigned char *memsize_str;
	unsigned long memsize;

	prom_argc = (int)fw_arg0;
	prom_argv = (char **)fw_arg1;
	prom_envp = (char **)fw_arg2;

	prom_init_cmdline();

	memsize_str = prom_getenv("memsize");
	if (!memsize_str || kstrtoul(memsize_str, 0, &memsize))
		memsize = SZ_64M; /* minimum memsize is 64MB RAM */

	memblock_add(0, memsize);
}

static inline unsigned char str2hexnum(unsigned char c)
{
	if (c >= '0' && c <= '9')
		return c - '0';
	if (c >= 'a' && c <= 'f')
		return c - 'a' + 10;
	if (c >= 'A' && c <= 'F')
		return c - 'A' + 10;

	return 0; /* foo */
}

static inline void str2eaddr(unsigned char *ea, unsigned char *str)
{
	int i;

	for (i = 0; i < 6; i++) {
		unsigned char num;

		if ((*str == '.') || (*str == ':'))
			str++;
		num  = str2hexnum(*str++) << 4;
		num |= str2hexnum(*str++);
		ea[i] = num;
	}
}

int __init prom_get_ethernet_addr(char *ethernet_addr)
{
	char *ethaddr_str;

	/* Check the environment variables first */
	ethaddr_str = prom_getenv("ethaddr");
	if (!ethaddr_str) {
		/* Check command line */
		ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
		if (!ethaddr_str)
			return -1;

		ethaddr_str += strlen("ethaddr=");
	}

	str2eaddr(ethernet_addr, ethaddr_str);

	return 0;
}

Annotation

Implementation Notes