summaryrefslogtreecommitdiffstats
path: root/target/linux/generic/patches-3.2/333-mips-kexec-get-kernel-parameters-from-kexec-tools.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/generic/patches-3.2/333-mips-kexec-get-kernel-parameters-from-kexec-tools.patch')
-rw-r--r--target/linux/generic/patches-3.2/333-mips-kexec-get-kernel-parameters-from-kexec-tools.patch88
1 files changed, 88 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.2/333-mips-kexec-get-kernel-parameters-from-kexec-tools.patch b/target/linux/generic/patches-3.2/333-mips-kexec-get-kernel-parameters-from-kexec-tools.patch
new file mode 100644
index 000000000..9da936314
--- /dev/null
+++ b/target/linux/generic/patches-3.2/333-mips-kexec-get-kernel-parameters-from-kexec-tools.patch
@@ -0,0 +1,88 @@
+From 240c76841b26f1b09aaced33414ee1d08b6454cf Mon Sep 17 00:00:00 2001
+From: Wu Zhangjin <wuzhangjin@gmail.com>
+Date: Sat, 15 Jan 2011 12:46:03 +0000
+Subject: MIPS: Get kernel parameters from kexec-tools
+
+Before, we simply use the command lines from the original bootloader,
+but it is not convenient. Now, we accept the kernel parameters from the
+--command-line or --append option of the kexec-tools. But If not
+--command-line or --apend option indicated, will fall back to use the
+ones from the original bootloader.
+
+Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
+---
+--- a/arch/mips/kernel/machine_kexec.c
++++ b/arch/mips/kernel/machine_kexec.c
+@@ -13,6 +13,7 @@
+ #include <asm/bootinfo.h>
+ #include <asm/cacheflush.h>
+ #include <asm/page.h>
++#include <asm/uaccess.h>
+
+ int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+ void (*_machine_kexec_shutdown)(void) = NULL;
+@@ -35,6 +36,56 @@ static void machine_kexec_init_args(void
+ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
+ }
+
++#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
++
++int machine_kexec_pass_args(struct kimage *image)
++{
++ int i, argc = 0;
++ char *bootloader = "kexec";
++ int *kexec_argv = (int *)kexec_args[1];
++
++ for (i = 0; i < image->nr_segments; i++) {
++ if (!strncmp(bootloader, (char *)image->segment[i].buf,
++ strlen(bootloader))) {
++ /*
++ * convert command line string to array
++ * of parameters (as bootloader does).
++ */
++ /*
++ * Note: we do treat the 1st string "kexec" as an
++ * argument ;-) so, argc here is 1.
++ */
++ char *str = (char *)image->segment[i].buf;
++ char *ptr = strchr(str, ' ');
++ char *kbuf = (char *)kexec_argv[0];
++ /* Whenever --command-line or --append used, "kexec" is copied */
++ argc = 1;
++ /* Parse the offset */
++ while (ptr && (ARGV_MAX_ARGS > argc)) {
++ *ptr = '\0';
++ if (ptr[1] != ' ' && ptr[1] != '\0') {
++ int offt = (int)(ptr - str + 1);
++ kexec_argv[argc] = (int)kbuf + offt;
++ argc++;
++ }
++ ptr = strchr(ptr + 1, ' ');
++ }
++ if (argc > 1) {
++ /* Copy to kernel space */
++ copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
++ fw_arg0 = kexec_args[0] = argc;
++ }
++ break;
++ }
++ }
++
++ pr_info("argc = %lu\n", kexec_args[0]);
++ for (i = 0; i < kexec_args[0]; i++)
++ pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
++
++ return 0;
++}
++
+ int
+ machine_kexec_prepare(struct kimage *kimage)
+ {
+@@ -45,6 +96,7 @@ machine_kexec_prepare(struct kimage *kim
+ * This can be overrided by _machine_kexec_prepare().
+ */
+ machine_kexec_init_args();
++ machine_kexec_pass_args(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);