Loongson platform obtain the initrd parameter through cmdline in kernel.
But kexec-tools pass the initrd through DTB.So add initrd parameter
to cmdline in order to compatible with some platforms.It is still
to pass the initrd parameter via command line.
Signed-off-by: Hui Li <lihui@xxxxxxxxxxx>
---
kexec/arch/mips/kexec-elf-mips.c | 43 ++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/kexec/arch/mips/kexec-elf-mips.c b/kexec/arch/mips/kexec-elf-mips.c
index a2d11fc..1de418e 100644
--- a/kexec/arch/mips/kexec-elf-mips.c
+++ b/kexec/arch/mips/kexec-elf-mips.c
@@ -40,6 +40,44 @@ 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;
+}
+
+
int elf_mips_probe(const char *buf, off_t len)
{
struct mem_ehdr ehdr;
@@ -171,6 +209,11 @@ 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 */
+ cmdline_add_initrd(cmdline_buf, PAGE_OFFSET + initrd_base, " rd_start=");
+ cmdline_add_initrd(cmdline_buf, initrd_size, " rd_size=");
+
}
--
2.20.1
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