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179 lines
4.6 KiB
179 lines
4.6 KiB
Index: linux-2.6.23.17/kernel/ksysfs.c
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===================================================================
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--- linux-2.6.23.17.orig/kernel/ksysfs.c
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+++ linux-2.6.23.17/kernel/ksysfs.c
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@@ -49,6 +49,165 @@ KERNEL_ATTR_RW(uevent_helper);
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#endif
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#ifdef CONFIG_KEXEC
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+
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+#include <asm/setup.h>
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+
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+extern unsigned long kexec_boot_params;
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+
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+char kexec_cmdline[COMMAND_LINE_SIZE] = "";
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+
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+static void
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+replace_cmdline_tag(void)
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+{
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+ char *t;
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+ struct tag *real;
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+ struct tag *copy;
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+ struct tag *rend;
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+ int i;
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+
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+/* TODO: check the return params */
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+ t = kmalloc(KEXEC_BOOT_PARAMS_SIZE + COMMAND_LINE_SIZE, GFP_KERNEL);
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+ memset((void *)t, 0, KEXEC_BOOT_PARAMS_SIZE + COMMAND_LINE_SIZE);
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+
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+/* TODO: validate that the boot params are ATAGS, in fact */
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+
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+ copy = (struct tag *)t;
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+ real = (struct tag *)kexec_boot_params;
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+ rend = (struct tag *)(kexec_boot_params + KEXEC_BOOT_PARAMS_SIZE);
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+ while ((real->hdr.size) && (real < rend)) {
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+ if (real->hdr.tag != ATAG_CMDLINE) {
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+ memcpy((void *)copy, (void *)real, real->hdr.size * 4);
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+ copy = tag_next(copy);
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+ }
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+ real = tag_next(real);
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+ }
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+
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+/* TODO: validate that we have enough space in the buffer */
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+
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+ i = strlen(kexec_cmdline);
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+ if (i) {
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+ copy->hdr.tag = ATAG_CMDLINE;
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+ copy->hdr.size = (sizeof(struct tag_header) + i + 1 + 4) >> 2;
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+ strcpy(copy->u.cmdline.cmdline, kexec_cmdline);
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+ copy = tag_next(copy);
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+ }
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+
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+ copy->hdr.tag = ATAG_NONE; /* Empty tag ends list */
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+ copy->hdr.size = 0; /* zero length */
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+
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+/* TODO: validate that the temporary buffer isn't too full */
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+
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+ memcpy((void *)kexec_boot_params, (void *)t, KEXEC_BOOT_PARAMS_SIZE);
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+
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+ kfree(t); /* Don't forget to free the big buffer we used */
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+}
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+
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+static ssize_t kexec_cmdline_show(struct kset *kset, char *page)
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+{
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+ return sprintf(page, "%s\n", kexec_cmdline);
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+}
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+
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+static ssize_t kexec_cmdline_store(struct kset *kset, const char *page,
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+ size_t count)
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+{
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+ if ((count + 1) > COMMAND_LINE_SIZE)
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+ count = COMMAND_LINE_SIZE;
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+ memcpy(kexec_cmdline, page, count);
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+ kexec_cmdline[count] = '\0';
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+ if (count && (kexec_cmdline[count - 1] == '\n'))
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+ kexec_cmdline[count - 1] = '\0';
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+ replace_cmdline_tag();
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+ return count;
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+}
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+KERNEL_ATTR_RW(kexec_cmdline);
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+
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+static ssize_t kexec_boot_params_show(struct kset *kset, char *page)
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+{
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+ unsigned long *p;
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+ char buf[PAGE_SIZE];
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+ int keep_doing;
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+
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+ p = (unsigned long *)kexec_boot_params;
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+
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+ /* if this doesn't look like atags, just print first few words */
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+ if (p[1] != ATAG_CORE)
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+ return sprintf(page, "0x%lx 0x%lx 0x%lx 0x%lx\n",
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+ p[0], p[1], p[2], p[3]);
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+
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+ /* carefully walk the atag list, and print out the structure */
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+ keep_doing = 1;
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+ do {
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+ switch (p[1]) {
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+ case ATAG_CORE:
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+ /* watch out, core tag is permitted to be empty */
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+ if (p[0] == 5)
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+ sprintf(buf,
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+ "CORE flg=%ld pgsz=%ld rdev=0x%lx\n",
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+ p[2], p[3], p[4]);
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+ else
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+ sprintf(buf,"CORE\n");
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+ break;
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+ case ATAG_MEM:
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+ sprintf(buf,"MEM %ldM@0x%lx\n", p[2] / (1024 * 1024),
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+ p[3]);
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+ break;
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+ case ATAG_VIDEOTEXT:
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+ sprintf(buf,"VIDEOTEXT sz=%ld\n", p[0]);
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+ break;
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+ case ATAG_RAMDISK:
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+ sprintf(buf,"RAMDISK prmpt=%ld %ldK@0x%lx\n",
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+ p[2], p[3], p[4]);
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+ break;
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+ case ATAG_INITRD2:
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+ sprintf(buf,"INITRD2 %ldK@0x%lx\n", p[3] / 1024, p[2]);
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+ break;
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+ case ATAG_SERIAL:
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+ sprintf(buf,"SERIAL high=0x%08lx low=0x%08lx\n",
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+ p[3], p[2]);
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+ break;
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+ case ATAG_REVISION:
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+ sprintf(buf,"REVISION rev=%ld\n", p[2]);
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+ break;
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+ case ATAG_VIDEOLFB:
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+ sprintf(buf,"VIDEOLFB sz=%ld\n", p[0]);
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+ break;
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+ case ATAG_CMDLINE:
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+ sprintf(buf,"CMD \"%s\"\n", (char *)&p[2]);
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+ break;
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+ case ATAG_NONE:
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+ sprintf(buf,"NONE\n");
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+ keep_doing = 0;
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+ break;
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+ default:
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+ sprintf(buf,"-unknown- sz=%ld\n", p[0]);
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+ break;
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+ }
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+
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+ /* carefully add to page */
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+ if ((strlen(buf) + strlen(page)) < PAGE_SIZE) {
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+ strcat(page, buf);
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+ } else {
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+ keep_doing = 0;
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+ }
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+
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+ /* stop when we encounter a header length of 0 */
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+ if (p[0] == 0)
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+ keep_doing = 0;
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+
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+ /* go to the next tag */
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+ p += p[0];
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+
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+ /* stop if we walked off the end of the buffer */
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+ if (p > (unsigned long *)(kexec_boot_params +
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+ KEXEC_BOOT_PARAMS_SIZE))
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+ keep_doing = 0;
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+
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+ } while (keep_doing);
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+
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+ return (strlen(page));
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+}
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+KERNEL_ATTR_RO(kexec_boot_params);
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+
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static ssize_t kexec_loaded_show(struct kset *kset, char *page)
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{
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return sprintf(page, "%d\n", !!kexec_image);
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@@ -95,6 +254,8 @@ static struct attribute * kernel_attrs[]
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#ifdef CONFIG_KEXEC
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&kexec_loaded_attr.attr,
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&kexec_crash_loaded_attr.attr,
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+ &kexec_cmdline_attr.attr,
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+ &kexec_boot_params_attr.attr,
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#endif
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NULL
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};
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