X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fkexec.c;h=25db14b89e82c529fcb217e311fbebf66c440c60;hb=736fad17b89e5e718908abb76ae9bce210a9d5d4;hp=fcdd5d2bc3f4b47b57854c41a1cec882939c02ed;hpb=946b92437e550d6ed80213bf54a1f383e141aede;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/kexec.c b/kernel/kexec.c
index fcdd5d2bc3f..25db14b89e8 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -20,6 +20,8 @@
 #include <linux/syscalls.h>
 #include <linux/ioport.h>
 #include <linux/hardirq.h>
+#include <linux/elf.h>
+#include <linux/elfcore.h>
 
 #include <asm/page.h>
 #include <asm/uaccess.h>
@@ -108,11 +110,10 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
 
 	/* Allocate a controlling structure */
 	result = -ENOMEM;
-	image = kmalloc(sizeof(*image), GFP_KERNEL);
+	image = kzalloc(sizeof(*image), GFP_KERNEL);
 	if (!image)
 		goto out;
 
-	memset(image, 0, sizeof(*image));
 	image->head = 0;
 	image->entry = &image->head;
 	image->last_entry = &image->head;
@@ -851,6 +852,7 @@ static int kimage_load_crash_segment(struct kimage *image,
 			memset(ptr + uchunk, 0, mchunk - uchunk);
 		}
 		result = copy_from_user(ptr, buf, uchunk);
+		kexec_flush_icache_page(page);
 		kunmap(page);
 		if (result) {
 			result = (result < 0) ? result : -EIO;
@@ -1067,6 +1069,60 @@ void crash_kexec(struct pt_regs *regs)
 	}
 }
 
+static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
+			    size_t data_len)
+{
+	struct elf_note note;
+
+	note.n_namesz = strlen(name) + 1;
+	note.n_descsz = data_len;
+	note.n_type   = type;
+	memcpy(buf, &note, sizeof(note));
+	buf += (sizeof(note) + 3)/4;
+	memcpy(buf, name, note.n_namesz);
+	buf += (note.n_namesz + 3)/4;
+	memcpy(buf, data, note.n_descsz);
+	buf += (note.n_descsz + 3)/4;
+
+	return buf;
+}
+
+static void final_note(u32 *buf)
+{
+	struct elf_note note;
+
+	note.n_namesz = 0;
+	note.n_descsz = 0;
+	note.n_type   = 0;
+	memcpy(buf, &note, sizeof(note));
+}
+
+void crash_save_cpu(struct pt_regs *regs, int cpu)
+{
+	struct elf_prstatus prstatus;
+	u32 *buf;
+
+	if ((cpu < 0) || (cpu >= NR_CPUS))
+		return;
+
+	/* Using ELF notes here is opportunistic.
+	 * I need a well defined structure format
+	 * for the data I pass, and I need tags
+	 * on the data to indicate what information I have
+	 * squirrelled away.  ELF notes happen to provide
+	 * all of that, so there is no need to invent something new.
+	 */
+	buf = (u32*)per_cpu_ptr(crash_notes, cpu);
+	if (!buf)
+		return;
+	memset(&prstatus, 0, sizeof(prstatus));
+	prstatus.pr_pid = current->pid;
+	elf_core_copy_regs(&prstatus.pr_reg, regs);
+	buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
+		      	      &prstatus, sizeof(prstatus));
+	final_note(buf);
+}
+
 static int __init crash_notes_memory_init(void)
 {
 	/* Allocate memory for saving cpu registers. */