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authorkogiidena <kogiidena@eggplant.ddo.jp>2006-01-16 22:14:10 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-16 23:15:27 -0800
commit9d44190eae97ad4c9ce30f1084e1b0dabd646df5 (patch)
treed4801a1f62ea7493b34c306a4ee685e0c4fa5f53 /arch/sh/kernel
parent0d831770b154a057562236e8cf50905c8f1ae1b0 (diff)
[PATCH] sh: kexec() support
This adds kexec() support for SH. Signed-off-by: kogiidena <kogiidena@eggplant.ddo.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org> Cc: <fastboot@lists.osdl.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/Makefile4
-rw-r--r--arch/sh/kernel/machine_kexec.c112
-rw-r--r--arch/sh/kernel/process.c10
-rw-r--r--arch/sh/kernel/relocate_kernel.S102
4 files changed, 225 insertions, 3 deletions
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index 8b819698df1..7a86eeb2265 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -17,6 +17,4 @@ obj-$(CONFIG_SH_KGDB) += kgdb_stub.o kgdb_jmp.o
obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
-
-USE_STANDARD_AS_RULE := true
-
+obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
new file mode 100644
index 00000000000..43546525f28
--- /dev/null
+++ b/arch/sh/kernel/machine_kexec.c
@@ -0,0 +1,112 @@
+/*
+ * machine_kexec.c - handle transition of Linux booting another kernel
+ * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
+ *
+ * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
+ * LANDISK/sh4 supported by kogiidena
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+
+typedef NORET_TYPE void (*relocate_new_kernel_t)(
+ unsigned long indirection_page,
+ unsigned long reboot_code_buffer,
+ unsigned long start_address,
+ unsigned long vbr_reg) ATTRIB_NORET;
+
+const extern unsigned char relocate_new_kernel[];
+const extern unsigned int relocate_new_kernel_size;
+extern void *gdb_vbr_vector;
+
+/*
+ * Provide a dummy crash_notes definition while crash dump arrives to ppc.
+ * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
+ */
+void *crash_notes = NULL;
+
+void machine_shutdown(void)
+{
+}
+
+void machine_crash_shutdown(struct pt_regs *regs)
+{
+}
+
+/*
+ * Do what every setup is needed on image and the
+ * reboot code buffer to allow us to avoid allocations
+ * later.
+ */
+int machine_kexec_prepare(struct kimage *image)
+{
+ return 0;
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+static void kexec_info(struct kimage *image)
+{
+ int i;
+ printk("kexec information\n");
+ for (i = 0; i < image->nr_segments; i++) {
+ printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
+ i,
+ (unsigned int)image->segment[i].mem,
+ (unsigned int)image->segment[i].mem + image->segment[i].memsz,
+ (unsigned int)image->segment[i].memsz);
+ }
+ printk(" start : 0x%08x\n\n", (unsigned int)image->start);
+}
+
+
+/*
+ * Do not allocate memory (or fail in any way) in machine_kexec().
+ * We are past the point of no return, committed to rebooting now.
+ */
+NORET_TYPE void machine_kexec(struct kimage *image)
+{
+
+ unsigned long page_list;
+ unsigned long reboot_code_buffer;
+ unsigned long vbr_reg;
+ relocate_new_kernel_t rnk;
+
+#if defined(CONFIG_SH_STANDARD_BIOS)
+ vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
+#else
+ vbr_reg = 0x80000000; // dummy
+#endif
+ /* Interrupts aren't acceptable while we reboot */
+ local_irq_disable();
+
+ page_list = image->head;
+
+ /* we need both effective and real address here */
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
+
+ /* copy our kernel relocation code to the control code page */
+ memcpy((void *)reboot_code_buffer, relocate_new_kernel,
+ relocate_new_kernel_size);
+
+ kexec_info(image);
+ flush_cache_all();
+
+ /* now call it */
+ rnk = (relocate_new_kernel_t) reboot_code_buffer;
+ (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
+}
+
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index aac15e42d03..a4dc2b532e1 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -71,6 +71,16 @@ void cpu_idle(void)
void machine_restart(char * __unused)
{
+
+#ifdef CONFIG_KEXEC
+ struct kimage *image;
+ image = xchg(&kexec_image, 0);
+ if (image) {
+ machine_shutdown();
+ machine_kexec(image);
+ }
+#endif
+
/* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
asm volatile("ldc %0, sr\n\t"
"mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
diff --git a/arch/sh/kernel/relocate_kernel.S b/arch/sh/kernel/relocate_kernel.S
new file mode 100644
index 00000000000..b0695cffec6
--- /dev/null
+++ b/arch/sh/kernel/relocate_kernel.S
@@ -0,0 +1,102 @@
+/*
+ * relocate_kernel.S - put the kernel image in place to boot
+ * 2005.9.17 kogiidena@eggplant.ddo.jp
+ *
+ * LANDISK/sh4 is supported. Maybe, SH archtecture works well.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+
+#define PAGE_SIZE 4096 /* must be same value as in <asm/page.h> */
+
+
+ .globl relocate_new_kernel
+relocate_new_kernel:
+ /* r4 = indirection_page */
+ /* r5 = reboot_code_buffer */
+ /* r6 = start_address */
+ /* r7 = vbr_reg */
+
+ mov.l 10f,r8 /* 4096 */
+ mov.l 11f,r9 /* 0xa0000000 */
+
+ /* stack setting */
+ add r8,r5
+ mov r5,r15
+
+ bra 1f
+ mov r4,r0 /* cmd = indirection_page */
+0:
+ mov.l @r4+,r0 /* cmd = *ind++ */
+
+1: /* addr = (cmd | 0xa0000000) & 0xfffffff0 */
+ mov r0,r2
+ or r9,r2
+ mov #-16,r1
+ and r1,r2
+
+ /* if(cmd & IND_DESTINATION) dst = addr */
+ tst #1,r0
+ bt 2f
+ bra 0b
+ mov r2,r5
+
+2: /* else if(cmd & IND_INDIRECTION) ind = addr */
+ tst #2,r0
+ bt 3f
+ bra 0b
+ mov r2,r4
+
+3: /* else if(cmd & IND_DONE) goto 6 */
+ tst #4,r0
+ bt 4f
+ bra 6f
+ nop
+
+4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
+ tst #8,r0
+ bt 0b
+
+ mov r8,r3
+ shlr2 r3
+ shlr2 r3
+5:
+ dt r3
+ mov.l @r2+,r1 /* 16n+0 */
+ mov.l r1,@r5
+ add #4,r5
+ mov.l @r2+,r1 /* 16n+4 */
+ mov.l r1,@r5
+ add #4,r5
+ mov.l @r2+,r1 /* 16n+8 */
+ mov.l r1,@r5
+ add #4,r5
+ mov.l @r2+,r1 /* 16n+12 */
+ mov.l r1,@r5
+ add #4,r5
+ bf 5b
+
+ bra 0b
+ nop
+6:
+#ifdef CONFIG_SH_STANDARD_BIOS
+ ldc r7, vbr
+#endif
+ jmp @r6
+ nop
+
+ .align 2
+10:
+ .long PAGE_SIZE
+11:
+ .long 0xa0000000
+
+relocate_new_kernel_end:
+
+ .globl relocate_new_kernel_size
+relocate_new_kernel_size:
+ .long relocate_new_kernel_end - relocate_new_kernel