[PATCH] kexec: s390 support
Add kexec support for s390 architecture. From: Milton Miller <miltonm@bga.com> - Fix passing of first argument to relocate_kernel assembly. - Fix Kconfig description. - Remove wrong comment and comments that describe obvious things. - Allow only KEXEC_TYPE_DEFAULT as image type -> dump not supported. Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens
committed by
Linus Torvalds
Linus Torvalds
parent
fce0d57403
commit
cf13f0eaff
@@ -455,6 +455,14 @@ config NO_IDLE_HZ_INIT
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The HZ timer is switched off in idle by default. That means the
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HZ timer is already disabled at boot time.
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config KEXEC
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bool "kexec system call (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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help
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kexec is a system call that implements the ability to shutdown your
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current kernel, and to start another kernel. It is like a reboot
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but is independent of hardware/microcode support.
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endmenu
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config PCMCIA
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@@ -25,6 +25,16 @@ obj-$(CONFIG_ARCH_S390X) += entry64.o reipl64.o
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obj-$(CONFIG_VIRT_TIMER) += vtime.o
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# Kexec part
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S390_KEXEC_OBJS := machine_kexec.o crash.o
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ifeq ($(CONFIG_ARCH_S390X),y)
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S390_KEXEC_OBJS += relocate_kernel64.o
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else
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S390_KEXEC_OBJS += relocate_kernel.o
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endif
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obj-$(CONFIG_KEXEC) += $(S390_KEXEC_OBJS)
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#
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# This is just to get the dependencies...
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#
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@@ -1441,3 +1441,11 @@ compat_sys_waitid_wrapper:
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lgfr %r5,%r5 # int
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llgtr %r6,%r6 # struct rusage_emu31 *
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jg compat_sys_waitid
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.globl compat_sys_kexec_load_wrapper
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compat_sys_kexec_load_wrapper:
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llgfr %r2,%r2 # unsigned long
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llgfr %r3,%r3 # unsigned long
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llgtr %r4,%r4 # struct kexec_segment *
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llgfr %r5,%r5 # unsigned long
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jg compat_sys_kexec_load
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17
arch/s390/kernel/crash.c
Normal file
17
arch/s390/kernel/crash.c
Normal file
@@ -0,0 +1,17 @@
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/*
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* arch/s390/kernel/crash.c
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*
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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*
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*/
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#include <linux/threads.h>
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#include <linux/kexec.h>
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note_buf_t crash_notes[NR_CPUS];
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void machine_crash_shutdown(void)
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{
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}
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98
arch/s390/kernel/machine_kexec.c
Normal file
98
arch/s390/kernel/machine_kexec.c
Normal file
@@ -0,0 +1,98 @@
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/*
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* arch/s390/kernel/machine_kexec.c
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*
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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*
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*/
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/*
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* s390_machine_kexec.c - handle the transition of Linux booting another kernel
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* on the S390 architecture.
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*/
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#include <asm/cio.h>
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#include <asm/setup.h>
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#include <linux/device.h>
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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static void kexec_halt_all_cpus(void *);
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typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long);
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const extern unsigned char relocate_kernel[];
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const extern unsigned long long relocate_kernel_len;
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int
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machine_kexec_prepare(struct kimage *image)
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{
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unsigned long reboot_code_buffer;
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/* We don't support anything but the default image type for now. */
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if (image->type != KEXEC_TYPE_DEFAULT)
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return -EINVAL;
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/* Get the destination where the assembler code should be copied to.*/
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reboot_code_buffer = page_to_pfn(image->control_code_page)<<PAGE_SHIFT;
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/* Then copy it */
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memcpy((void *) reboot_code_buffer, relocate_kernel,
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relocate_kernel_len);
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return 0;
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}
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void
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machine_kexec_cleanup(struct kimage *image)
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{
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}
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void
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machine_shutdown(void)
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{
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printk(KERN_INFO "kexec: machine_shutdown called\n");
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}
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NORET_TYPE void
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machine_kexec(struct kimage *image)
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{
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clear_all_subchannels();
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/* Disable lowcore protection */
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ctl_clear_bit(0,28);
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on_each_cpu(kexec_halt_all_cpus, image, 0, 0);
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for(;;);
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}
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static void
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kexec_halt_all_cpus(void *kernel_image)
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{
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static atomic_t cpuid = ATOMIC_INIT(-1);
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int cpu;
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struct kimage *image;
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relocate_kernel_t data_mover;
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if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
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signal_processor(smp_processor_id(), sigp_stop);
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/* Wait for all other cpus to enter stopped state */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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while(!smp_cpu_not_running(cpu))
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cpu_relax();
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}
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image = (struct kimage *) kernel_image;
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data_mover = (relocate_kernel_t)
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(page_to_pfn(image->control_code_page) << PAGE_SHIFT);
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/* Call the moving routine */
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(*data_mover) (&image->head, image->start);
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}
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81
arch/s390/kernel/relocate_kernel.S
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81
arch/s390/kernel/relocate_kernel.S
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@@ -0,0 +1,81 @@
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/*
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* arch/s390/kernel/relocate_kernel.S
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*
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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*
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*/
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/*
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* moves the new kernel to its destination...
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* %r2 = pointer to first kimage_entry_t
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* %r3 = start address - where to jump to after the job is done...
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*
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* %r5 will be used as temp. storage
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* %r6 holds the destination address
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* %r7 = PAGE_SIZE
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* %r8 holds the source address
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* %r9 = PAGE_SIZE
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* %r10 is a page mask
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*/
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.text
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.globl relocate_kernel
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relocate_kernel:
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basr %r13,0 #base address
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.base:
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spx zero64-.base(%r13) #absolute addressing mode
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stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external)
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lhi %r10,-1 #preparing the mask
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sll %r10,12 #shift it such that it becomes 0xf000
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.top:
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lhi %r7,4096 #load PAGE_SIZE in r7
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lhi %r9,4096 #load PAGE_SIZE in r9
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l %r5,0(%r2) #read another word for indirection page
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ahi %r2,4 #increment pointer
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tml %r5,0x1 #is it a destination page?
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je .indir_check #NO, goto "indir_check"
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lr %r6,%r5 #r6 = r5
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nr %r6,%r10 #mask it out and...
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j .top #...next iteration
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.indir_check:
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tml %r5,0x2 #is it a indirection page?
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je .done_test #NO, goto "done_test"
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nr %r5,%r10 #YES, mask out,
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lr %r2,%r5 #move it into the right register,
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j .top #and read next...
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.done_test:
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tml %r5,0x4 #is it the done indicator?
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je .source_test #NO! Well, then it should be the source indicator...
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j .done #ok, lets finish it here...
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.source_test:
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tml %r5,0x8 #it should be a source indicator...
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je .top #NO, ignore it...
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lr %r8,%r5 #r8 = r5
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nr %r8,%r10 #masking
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0: mvcle %r6,%r8,0x0 #copy PAGE_SIZE bytes from r8 to r6 - pad with 0
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jo 0b
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j .top
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.done:
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sr %r0,%r0 #clear register r0
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la %r4,load_psw-.base(%r13) #load psw-address into the register
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o %r3,4(%r4) #or load address into psw
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st %r3,4(%r4)
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mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
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sr %r1,%r1 #clear %r1
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sr %r2,%r2 #clear %r2
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sigp %r1,%r2,0x12 #set cpuid to zero
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lpsw 0 #hopefully start new kernel...
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.align 8
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zero64:
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.quad 0
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load_psw:
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.long 0x00080000,0x80000000
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sys_msk:
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.quad 0
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relocate_kernel_end:
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.globl relocate_kernel_len
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relocate_kernel_len:
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.quad relocate_kernel_end - relocate_kernel
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82
arch/s390/kernel/relocate_kernel64.S
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82
arch/s390/kernel/relocate_kernel64.S
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@@ -0,0 +1,82 @@
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/*
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* arch/s390/kernel/relocate_kernel64.S
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*
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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*
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*/
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/*
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* moves the new kernel to its destination...
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* %r2 = pointer to first kimage_entry_t
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* %r3 = start address - where to jump to after the job is done...
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*
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* %r5 will be used as temp. storage
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* %r6 holds the destination address
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* %r7 = PAGE_SIZE
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* %r8 holds the source address
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* %r9 = PAGE_SIZE
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*
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* 0xf000 is a page_mask
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*/
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.text
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.globl relocate_kernel
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relocate_kernel:
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basr %r13,0 #base address
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.base:
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spx zero64-.base(%r13) #absolute addressing mode
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stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external)
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.top:
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lghi %r7,4096 #load PAGE_SIZE in r7
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lghi %r9,4096 #load PAGE_SIZE in r9
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lg %r5,0(%r2) #read another word for indirection page
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aghi %r2,8 #increment pointer
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tml %r5,0x1 #is it a destination page?
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je .indir_check #NO, goto "indir_check"
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lgr %r6,%r5 #r6 = r5
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nill %r6,0xf000 #mask it out and...
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j .top #...next iteration
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.indir_check:
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tml %r5,0x2 #is it a indirection page?
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je .done_test #NO, goto "done_test"
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nill %r5,0xf000 #YES, mask out,
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lgr %r2,%r5 #move it into the right register,
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j .top #and read next...
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.done_test:
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tml %r5,0x4 #is it the done indicator?
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je .source_test #NO! Well, then it should be the source indicator...
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j .done #ok, lets finish it here...
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.source_test:
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tml %r5,0x8 #it should be a source indicator...
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je .top #NO, ignore it...
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lgr %r8,%r5 #r8 = r5
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nill %r8,0xf000 #masking
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0: mvcle %r6,%r8,0x0 #copy PAGE_SIZE bytes from r8 to r6 - pad with 0
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jo 0b
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j .top
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.done:
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sgr %r0,%r0 #clear register r0
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la %r4,load_psw-.base(%r13) #load psw-address into the register
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o %r3,4(%r4) #or load address into psw
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st %r3,4(%r4)
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mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
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sam31 #31 bit mode
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sr %r1,%r1 #erase register r1
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sr %r2,%r2 #erase register r2
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sigp %r1,%r2,0x12 #set cpuid to zero
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lpsw 0 #hopefully start new kernel...
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.align 8
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zero64:
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.quad 0
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load_psw:
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.long 0x00080000,0x80000000
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sys_msk:
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.quad 0
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relocate_kernel_end:
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.globl relocate_kernel_len
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relocate_kernel_len:
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.quad relocate_kernel_end - relocate_kernel
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@@ -285,7 +285,7 @@ SYSCALL(sys_mq_timedsend,sys_mq_timedsend,compat_sys_mq_timedsend_wrapper)
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SYSCALL(sys_mq_timedreceive,sys_mq_timedreceive,compat_sys_mq_timedreceive_wrapper)
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SYSCALL(sys_mq_notify,sys_mq_notify,compat_sys_mq_notify_wrapper) /* 275 */
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SYSCALL(sys_mq_getsetattr,sys_mq_getsetattr,compat_sys_mq_getsetattr_wrapper)
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NI_SYSCALL /* reserved for kexec */
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SYSCALL(sys_kexec_load,sys_kexec_load,compat_sys_kexec_load_wrapper)
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SYSCALL(sys_add_key,sys_add_key,compat_sys_add_key_wrapper)
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SYSCALL(sys_request_key,sys_request_key,compat_sys_request_key_wrapper)
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SYSCALL(sys_keyctl,sys_keyctl,compat_sys_keyctl) /* 280 */
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