1 files changed, 74 insertions, 2 deletions

diff --git a/kexec/arch/mips/kexec-elf-mips.c b/kexec/arch/mips/kexec-elf-mips.c
index a2d11fc6..31f4c478 100644
--- a/kexec/arch/mips/kexec-elf-mips.c
+++ b/kexec/arch/mips/kexec-elf-mips.c
@@ -40,6 +40,77 @@ static const int probe_debug = 0;
 #define CMDLINE_PREFIX "kexec "
 static char cmdline_buf[COMMAND_LINE_SIZE] = CMDLINE_PREFIX;
 
+/* Converts unsigned long to ascii string. */
+static void ultoa(unsigned long i, char *str)
+{
+	int j = 0, k;
+	char tmp;
+
+	do {
+		str[j++] = i % 10 + '0';
+	} while ((i /= 10) > 0);
+	str[j] = '\0';
+
+	/* Reverse the string. */
+	for (j = 0, k = strlen(str) - 1; j < k; j++, k--) {
+		tmp = str[k];
+		str[k] = str[j];
+		str[j] = tmp;
+	}
+}
+
+/* Adds initrd parameters to command line. */
+static int cmdline_add_initrd(char *cmdline, unsigned long addr, char *new_para)
+{
+	int cmdlen, len;
+	char str[30], *ptr;
+
+	ptr = str;
+	strcpy(str, new_para);
+	ptr += strlen(str);
+	ultoa(addr, ptr);
+	len = strlen(str);
+	cmdlen = strlen(cmdline) + len;
+	if (cmdlen > (COMMAND_LINE_SIZE - 1))
+		die("Command line overflow\n");
+	strcat(cmdline, str);
+
+	return 0;
+}
+
+/* add initrd to cmdline to compatible with previous platforms. */
+static int patch_initrd_info(char *cmdline, unsigned long base,
+			     unsigned long size)
+{
+	const char cpuinfo[] = "/proc/cpuinfo";
+	char line[MAX_LINE];
+	FILE *fp;
+	unsigned long page_offset = PAGE_OFFSET;
+
+	fp = fopen(cpuinfo, "r");
+	if (!fp) {
+		fprintf(stderr, "Cannot open %s: %s\n",
+		cpuinfo, strerror(errno));
+		return -1;
+	}
+	while (fgets(line, sizeof(line), fp) != 0) {
+		if (strncmp(line, "cpu model", 9) == 0) {
+			if (strstr(line, "Loongson")) {
+				/* LOONGSON64  uses a different page_offset. */
+				if (arch_options.core_header_type ==
+				    CORE_TYPE_ELF64)
+					page_offset = LOONGSON_PAGE_OFFSET;
+				cmdline_add_initrd(cmdline,
+					     page_offset + base, " rd_start=");
+				cmdline_add_initrd(cmdline, size, " rd_size=");
+				break;
+			}
+		}
+	}
+	fclose(fp);
+	return 0;
+}
+
 int elf_mips_probe(const char *buf, off_t len)
 {
 	struct mem_ehdr ehdr;
@@ -171,9 +242,10 @@ int elf_mips_load(int argc, char **argv, const char *buf, off_t len,
 		/* Now that the buffer for initrd is prepared, update the dtb
 		 * with an appropriate location */
 		dtb_set_initrd(&dtb_buf, &dtb_length, initrd_base, initrd_base + initrd_size);
-	}
-
 
+		/* Add the initrd parameters to cmdline */
+		patch_initrd_info(cmdline_buf, initrd_base, initrd_size);
+	}
 	/* This is a legacy method for commandline passing used
 	 * currently by Octeon CPUs only */
 	add_buffer(info, cmdline_buf, sizeof(cmdline_buf),