aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorNicolas Schichan <nschichan@freebox.fr>2006-10-18 09:14:55 -0400
committerRalf Baechle <ralf@linux-mips.org>2006-11-29 20:14:44 -0500
commit583bb86fbb9e85287f020fe4eb5352a0ec3c66a3 (patch)
tree5aa886f3fd85387d26df30bc33ef24aeda1181f5
parentc237923009da464881d89f4bc27c3b5b1a93d61b (diff)
[MIPS] Add support for kexec
A tiny userland application loading the kernel and invoking kexec_load for mips is available here: http://chac.le-poulpe.net/~nico/kexec/kexec-2006-10-18.tar.gz Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/Kconfig17
-rw-r--r--arch/mips/kernel/Makefile2
-rw-r--r--arch/mips/kernel/machine_kexec.c85
-rw-r--r--arch/mips/kernel/relocate_kernel.S80
-rw-r--r--arch/mips/kernel/scall32-o32.S2
-rw-r--r--arch/mips/kernel/scall64-64.S2
-rw-r--r--arch/mips/kernel/scall64-n32.S2
-rw-r--r--arch/mips/kernel/scall64-o32.S2
-rw-r--r--include/asm-mips/kexec.h32
-rw-r--r--include/linux/kexec.h2
10 files changed, 222 insertions, 4 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1443024b1c7c..c0da0ffe8d57 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -766,6 +766,23 @@ config TOSHIBA_RBTX4938
766 766
767endchoice 767endchoice
768 768
769config KEXEC
770 bool "Kexec system call (EXPERIMENTAL)"
771 depends on EXPERIMENTAL
772 help
773 kexec is a system call that implements the ability to shutdown your
774 current kernel, and to start another kernel. It is like a reboot
775 but it is indepedent of the system firmware. And like a reboot
776 you can start any kernel with it, not just Linux.
777
778 The name comes from the similiarity to the exec system call.
779
780 It is an ongoing process to be certain the hardware in a machine
781 is properly shutdown, so do not be surprised if this code does not
782 initially work for you. It may help to enable device hotplugging
783 support. As of this writing the exact hardware interface is
784 strongly in flux, so no good recommendation can be made.
785
769source "arch/mips/ddb5xxx/Kconfig" 786source "arch/mips/ddb5xxx/Kconfig"
770source "arch/mips/gt64120/ev64120/Kconfig" 787source "arch/mips/gt64120/ev64120/Kconfig"
771source "arch/mips/jazz/Kconfig" 788source "arch/mips/jazz/Kconfig"
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 6bfbbed0897e..f35b739d0a12 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -67,6 +67,8 @@ obj-$(CONFIG_64BIT) += cpu-bugs64.o
67 67
68obj-$(CONFIG_I8253) += i8253.o 68obj-$(CONFIG_I8253) += i8253.o
69 69
70obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
71
70CFLAGS_cpu-bugs64.o = $(shell if $(CC) $(CFLAGS) -Wa,-mdaddi -c -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-DHAVE_AS_SET_DADDI"; fi) 72CFLAGS_cpu-bugs64.o = $(shell if $(CC) $(CFLAGS) -Wa,-mdaddi -c -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-DHAVE_AS_SET_DADDI"; fi)
71 73
72EXTRA_AFLAGS := $(CFLAGS) 74EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/kernel/machine_kexec.c b/arch/mips/kernel/machine_kexec.c
new file mode 100644
index 000000000000..e0ad754c7edd
--- /dev/null
+++ b/arch/mips/kernel/machine_kexec.c
@@ -0,0 +1,85 @@
1/*
2 * machine_kexec.c for kexec
3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
4 *
5 * This source code is licensed under the GNU General Public License,
6 * Version 2. See the file COPYING for more details.
7 */
8
9#include <linux/kexec.h>
10#include <linux/mm.h>
11#include <linux/delay.h>
12
13#include <asm/cacheflush.h>
14#include <asm/page.h>
15
16const extern unsigned char relocate_new_kernel[];
17const extern unsigned int relocate_new_kernel_size;
18
19extern unsigned long kexec_start_address;
20extern unsigned long kexec_indirection_page;
21
22int
23machine_kexec_prepare(struct kimage *kimage)
24{
25 return 0;
26}
27
28void
29machine_kexec_cleanup(struct kimage *kimage)
30{
31}
32
33void
34machine_shutdown(void)
35{
36}
37
38void
39machine_crash_shutdown(struct pt_regs *regs)
40{
41}
42
43void
44machine_kexec(struct kimage *image)
45{
46 unsigned long reboot_code_buffer;
47 unsigned long entry;
48 unsigned long *ptr;
49
50 reboot_code_buffer =
51 (unsigned long)page_address(image->control_code_page);
52
53 kexec_start_address = image->start;
54 kexec_indirection_page = phys_to_virt(image->head & PAGE_MASK);
55
56 memcpy((void*)reboot_code_buffer, relocate_new_kernel,
57 relocate_new_kernel_size);
58
59 /*
60 * The generic kexec code builds a page list with physical
61 * addresses. they are directly accessible through KSEG0 (or
62 * CKSEG0 or XPHYS if on 64bit system), hence the
63 * pys_to_virt() call.
64 */
65 for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
66 ptr = (entry & IND_INDIRECTION) ?
67 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
68 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
69 *ptr & IND_DESTINATION)
70 *ptr = phys_to_virt(*ptr);
71 }
72
73 /*
74 * we do not want to be bothered.
75 */
76 local_irq_disable();
77
78 flush_icache_range(reboot_code_buffer,
79 reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
80
81 printk("Will call new kernel at %08x\n", image->start);
82 printk("Bye ...\n");
83 flush_cache_all();
84 ((void (*)(void))reboot_code_buffer)();
85}
diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S
new file mode 100644
index 000000000000..a3f0d00c1334
--- /dev/null
+++ b/arch/mips/kernel/relocate_kernel.S
@@ -0,0 +1,80 @@
1/*
2 * relocate_kernel.S for kexec
3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
4 *
5 * This source code is licensed under the GNU General Public License,
6 * Version 2. See the file COPYING for more details.
7 */
8
9#include <asm/asm.h>
10#include <asm/asmmacro.h>
11#include <asm/regdef.h>
12#include <asm/page.h>
13#include <asm/mipsregs.h>
14#include <asm/stackframe.h>
15#include <asm/addrspace.h>
16
17 .globl relocate_new_kernel
18relocate_new_kernel:
19
20 PTR_L s0, kexec_indirection_page
21 PTR_L s1, kexec_start_address
22
23process_entry:
24 PTR_L s2, (s0)
25 PTR_ADD s0, s0, SZREG
26
27 /* destination page */
28 and s3, s2, 0x1
29 beq s3, zero, 1f
30 and s4, s2, ~0x1 /* store destination addr in s4 */
31 move a0, s4
32 b process_entry
33
341:
35 /* indirection page, update s0 */
36 and s3, s2, 0x2
37 beq s3, zero, 1f
38 and s0, s2, ~0x2
39 b process_entry
40
411:
42 /* done page */
43 and s3, s2, 0x4
44 beq s3, zero, 1f
45 b done
461:
47 /* source page */
48 and s3, s2, 0x8
49 beq s3, zero, process_entry
50 and s2, s2, ~0x8
51 li s6, (1 << PAGE_SHIFT) / SZREG
52
53copy_word:
54 /* copy page word by word */
55 REG_L s5, (s2)
56 REG_S s5, (s4)
57 INT_ADD s4, s4, SZREG
58 INT_ADD s2, s2, SZREG
59 INT_SUB s6, s6, 1
60 beq s6, zero, process_entry
61 b copy_word
62 b process_entry
63
64done:
65 /* jump to kexec_start_address */
66 j s1
67
68 .globl kexec_start_address
69kexec_start_address:
70 .long 0x0
71
72 .globl kexec_indirection_page
73kexec_indirection_page:
74 .long 0x0
75
76relocate_new_kernel_end:
77
78 .globl relocate_new_kernel_size
79relocate_new_kernel_size:
80 .long relocate_new_kernel_end - relocate_new_kernel
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index a95f37de080e..7c0b3936ba44 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -653,7 +653,7 @@ einval: li v0, -EINVAL
653 sys sys_move_pages 6 653 sys sys_move_pages 6
654 sys sys_set_robust_list 2 654 sys sys_set_robust_list 2
655 sys sys_get_robust_list 3 /* 4310 */ 655 sys sys_get_robust_list 3 /* 4310 */
656 sys sys_ni_syscall 0 656 sys sys_kexec_load 4
657 sys sys_getcpu 3 657 sys sys_getcpu 3
658 sys sys_epoll_pwait 6 658 sys sys_epoll_pwait 6
659 .endm 659 .endm
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index 8fb0f60f657b..e569b846e9a3 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -468,6 +468,6 @@ sys_call_table:
468 PTR sys_move_pages 468 PTR sys_move_pages
469 PTR sys_set_robust_list 469 PTR sys_set_robust_list
470 PTR sys_get_robust_list 470 PTR sys_get_robust_list
471 PTR sys_ni_syscall /* 5270 */ 471 PTR sys_kexec_load /* 5270 */
472 PTR sys_getcpu 472 PTR sys_getcpu
473 PTR sys_epoll_pwait 473 PTR sys_epoll_pwait
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index 0da5ca2040ff..5b18f265d75b 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -394,6 +394,6 @@ EXPORT(sysn32_call_table)
394 PTR sys_move_pages 394 PTR sys_move_pages
395 PTR compat_sys_set_robust_list 395 PTR compat_sys_set_robust_list
396 PTR compat_sys_get_robust_list 396 PTR compat_sys_get_robust_list
397 PTR sys_ni_syscall 397 PTR compat_sys_kexec_load
398 PTR sys_getcpu 398 PTR sys_getcpu
399 PTR sys_epoll_pwait 399 PTR sys_epoll_pwait
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index b9d00cae8b5f..e91379c1be1d 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -516,7 +516,7 @@ sys_call_table:
516 PTR compat_sys_move_pages 516 PTR compat_sys_move_pages
517 PTR compat_sys_set_robust_list 517 PTR compat_sys_set_robust_list
518 PTR compat_sys_get_robust_list /* 4310 */ 518 PTR compat_sys_get_robust_list /* 4310 */
519 PTR sys_ni_syscall 519 PTR compat_sys_kexec_load
520 PTR sys_getcpu 520 PTR sys_getcpu
521 PTR sys_epoll_pwait 521 PTR sys_epoll_pwait
522 .size sys_call_table,.-sys_call_table 522 .size sys_call_table,.-sys_call_table
diff --git a/include/asm-mips/kexec.h b/include/asm-mips/kexec.h
new file mode 100644
index 000000000000..b25267ebcb09
--- /dev/null
+++ b/include/asm-mips/kexec.h
@@ -0,0 +1,32 @@
1/*
2 * kexec.h for kexec
3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 14:59:34 2006
4 *
5 * This source code is licensed under the GNU General Public License,
6 * Version 2. See the file COPYING for more details.
7 */
8
9#ifndef _MIPS_KEXEC
10# define _MIPS_KEXEC
11
12/* Maximum physical address we can use pages from */
13#define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
14/* Maximum address we can reach in physical address mode */
15#define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
16 /* Maximum address we can use for the control code buffer */
17#define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
18
19#define KEXEC_CONTROL_CODE_SIZE 4096
20
21/* The native architecture */
22#define KEXEC_ARCH KEXEC_ARCH_MIPS
23
24#define MAX_NOTE_BYTES 1024
25
26static inline void crash_setup_regs(struct pt_regs *newregs,
27 struct pt_regs *oldregs)
28{
29 /* Dummy implementation for now */
30}
31
32#endif /* !_MIPS_KEXEC */
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 6427949ddf99..a4ede62b339d 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -122,6 +122,8 @@ extern struct kimage *kexec_crash_image;
122#define KEXEC_ARCH_IA_64 (50 << 16) 122#define KEXEC_ARCH_IA_64 (50 << 16)
123#define KEXEC_ARCH_S390 (22 << 16) 123#define KEXEC_ARCH_S390 (22 << 16)
124#define KEXEC_ARCH_SH (42 << 16) 124#define KEXEC_ARCH_SH (42 << 16)
125#define KEXEC_ARCH_MIPS_LE (10 << 16)
126#define KEXEC_ARCH_MIPS ( 8 << 16)
125 127
126#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */ 128#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
127 129