6c74274c8d
It is based on patches from the linux-longsoon-community git tree: http://dev.lemote.com/cgit/linux-loongson-community.git/ Now the kernel can use the command line parameter from kexec-tools. Runtime tested on ar71xx with 2.6.39.4 (the wathdog must be stopped before executing the new kernel). Compile tested with lantiq (3.1.4) and brcm47xx (3.0.12). SVN-Revision: 29674
89 lines
2.7 KiB
Diff
89 lines
2.7 KiB
Diff
From 240c76841b26f1b09aaced33414ee1d08b6454cf Mon Sep 17 00:00:00 2001
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From: Wu Zhangjin <wuzhangjin@gmail.com>
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Date: Sat, 15 Jan 2011 12:46:03 +0000
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Subject: MIPS: Get kernel parameters from kexec-tools
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Before, we simply use the command lines from the original bootloader,
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but it is not convenient. Now, we accept the kernel parameters from the
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--command-line or --append option of the kexec-tools. But If not
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--command-line or --apend option indicated, will fall back to use the
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ones from the original bootloader.
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Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
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---
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--- a/arch/mips/kernel/machine_kexec.c
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+++ b/arch/mips/kernel/machine_kexec.c
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@@ -13,6 +13,7 @@
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#include <asm/bootinfo.h>
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#include <asm/cacheflush.h>
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#include <asm/page.h>
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+#include <asm/uaccess.h>
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int (*_machine_kexec_prepare)(struct kimage *) = NULL;
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void (*_machine_kexec_shutdown)(void) = NULL;
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@@ -35,6 +36,56 @@ static void machine_kexec_init_args(void
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pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
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}
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+#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
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+
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+int machine_kexec_pass_args(struct kimage *image)
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+{
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+ int i, argc = 0;
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+ char *bootloader = "kexec";
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+ int *kexec_argv = (int *)kexec_args[1];
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+
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+ for (i = 0; i < image->nr_segments; i++) {
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+ if (!strncmp(bootloader, (char *)image->segment[i].buf,
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+ strlen(bootloader))) {
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+ /*
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+ * convert command line string to array
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+ * of parameters (as bootloader does).
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+ */
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+ /*
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+ * Note: we do treat the 1st string "kexec" as an
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+ * argument ;-) so, argc here is 1.
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+ */
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+ char *str = (char *)image->segment[i].buf;
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+ char *ptr = strchr(str, ' ');
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+ char *kbuf = (char *)kexec_argv[0];
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+ /* Whenever --command-line or --append used, "kexec" is copied */
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+ argc = 1;
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+ /* Parse the offset */
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+ while (ptr && (ARGV_MAX_ARGS > argc)) {
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+ *ptr = '\0';
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+ if (ptr[1] != ' ' && ptr[1] != '\0') {
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+ int offt = (int)(ptr - str + 1);
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+ kexec_argv[argc] = (int)kbuf + offt;
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+ argc++;
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+ }
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+ ptr = strchr(ptr + 1, ' ');
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+ }
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+ if (argc > 1) {
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+ /* Copy to kernel space */
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+ copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
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+ fw_arg0 = kexec_args[0] = argc;
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+ }
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+ break;
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+ }
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+ }
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+
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+ pr_info("argc = %lu\n", kexec_args[0]);
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+ for (i = 0; i < kexec_args[0]; i++)
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+ pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
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+
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+ return 0;
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+}
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+
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int
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machine_kexec_prepare(struct kimage *kimage)
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{
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@@ -45,6 +96,7 @@ machine_kexec_prepare(struct kimage *kim
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* This can be overrided by _machine_kexec_prepare().
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*/
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machine_kexec_init_args();
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+ machine_kexec_pass_args(kimage);
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if (_machine_kexec_prepare)
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return _machine_kexec_prepare(kimage);
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