X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Fx86_64%2Fkernel%2Fcrash.c;h=d8d5750d6106a1270817a360868cdbfb3d281338;hb=b20e481ab595e9667c33e2393bdfe9a31870d11f;hp=abc601f36b6eeca8fa16831f1ad238a45403f030;hpb=cffe632a25b017dac4b6f060cad31940c6c167b4;p=linux-2.6-omap-h63xx.git

diff --git a/arch/x86_64/kernel/crash.c b/arch/x86_64/kernel/crash.c
index abc601f36b6..d8d5750d610 100644
--- a/arch/x86_64/kernel/crash.c
+++ b/arch/x86_64/kernel/crash.c
@@ -11,9 +11,12 @@
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/smp.h>
+#include <linux/irq.h>
 #include <linux/reboot.h>
 #include <linux/kexec.h>
 #include <linux/delay.h>
+#include <linux/elf.h>
+#include <linux/elfcore.h>
 
 #include <asm/processor.h>
 #include <asm/hardirq.h>
@@ -24,6 +27,71 @@
 /* This keeps a track of which one is crashing cpu. */
 static int crashing_cpu;
 
+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));
+}
+
+static void crash_save_this_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 that 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, "CORE", NT_PRSTATUS, &prstatus,
+					sizeof(prstatus));
+	final_note(buf);
+}
+
+static void crash_save_self(struct pt_regs *regs)
+{
+	int cpu;
+
+	cpu = smp_processor_id();
+	crash_save_this_cpu(regs, cpu);
+}
+
 #ifdef CONFIG_SMP
 static atomic_t waiting_for_crash_ipi;
 
@@ -38,18 +106,19 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu)
 		return 1;
 	local_irq_disable();
 
+	crash_save_this_cpu(regs, cpu);
 	disable_local_APIC();
 	atomic_dec(&waiting_for_crash_ipi);
 	/* Assume hlt works */
 	for(;;)
-		asm("hlt");
+		halt();
 
 	return 1;
 }
 
 static void smp_send_nmi_allbutself(void)
 {
-	send_IPI_allbutself(APIC_DM_NMI);
+	send_IPI_allbutself(NMI_VECTOR);
 }
 
 /*
@@ -92,7 +161,7 @@ void machine_crash_shutdown(struct pt_regs *regs)
 {
 	/*
 	 * This function is only called after the system
-	 * has paniced or is otherwise in a critical state.
+	 * has panicked or is otherwise in a critical state.
 	 * The minimum amount of code to allow a kexec'd kernel
 	 * to run successfully needs to happen here.
 	 *
@@ -113,4 +182,5 @@ void machine_crash_shutdown(struct pt_regs *regs)
 	disable_IO_APIC();
 #endif
 
+	crash_save_self(regs);
 }