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parisc: add kexec syscall support
Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Sven Schnelle
Helge Deller
parent
507efd63d9
commit
fc697dc0c2
@ -346,6 +346,19 @@ config NR_CPUS
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depends on SMP
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default "4"
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config KEXEC
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bool "Kexec system call"
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select KEXEC_CORE
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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 it is independent of the system firmware. And like a reboot
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you can start any kernel with it, not just Linux.
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It is an ongoing process to be certain the hardware in a machine
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shutdown, so do not be surprised if this code does not
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initially work for you.
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endmenu
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@ -30,6 +30,7 @@
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enum fixed_addresses {
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/* Support writing RO kernel text via kprobes, jump labels, etc. */
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FIX_TEXT_POKE0,
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FIX_TEXT_KEXEC,
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FIX_BITMAP_COUNT
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};
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37
arch/parisc/include/asm/kexec.h
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37
arch/parisc/include/asm/kexec.h
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@ -0,0 +1,37 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_PARISC_KEXEC_H
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#define _ASM_PARISC_KEXEC_H
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#ifdef CONFIG_KEXEC
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
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#define KEXEC_CONTROL_PAGE_SIZE 4096
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#define KEXEC_ARCH KEXEC_ARCH_PARISC
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#define ARCH_HAS_KIMAGE_ARCH
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#ifndef __ASSEMBLY__
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struct kimage_arch {
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unsigned long initrd_start;
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unsigned long initrd_end;
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unsigned long cmdline;
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};
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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/* Dummy implementation for now */
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}
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_KEXEC */
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#endif /* _ASM_PARISC_KEXEC_H */
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@ -37,3 +37,4 @@ obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KEXEC) += kexec.o relocate_kernel.o
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105
arch/parisc/kernel/kexec.c
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105
arch/parisc/kernel/kexec.c
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@ -0,0 +1,105 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/console.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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extern void relocate_new_kernel(unsigned long head,
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unsigned long start,
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unsigned long phys);
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extern const unsigned int relocate_new_kernel_size;
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extern unsigned int kexec_initrd_start_offset;
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extern unsigned int kexec_initrd_end_offset;
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extern unsigned int kexec_cmdline_offset;
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extern unsigned int kexec_free_mem_offset;
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static void kexec_show_segment_info(const struct kimage *kimage,
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unsigned long n)
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{
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pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
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n,
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kimage->segment[n].mem,
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kimage->segment[n].mem + kimage->segment[n].memsz,
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(unsigned long)kimage->segment[n].memsz,
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(unsigned long)kimage->segment[n].memsz / PAGE_SIZE);
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}
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static void kexec_image_info(const struct kimage *kimage)
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{
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unsigned long i;
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pr_debug("kexec kimage info:\n");
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pr_debug(" type: %d\n", kimage->type);
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pr_debug(" start: %lx\n", kimage->start);
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pr_debug(" head: %lx\n", kimage->head);
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pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
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for (i = 0; i < kimage->nr_segments; i++)
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kexec_show_segment_info(kimage, i);
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}
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void machine_kexec_cleanup(struct kimage *kimage)
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{
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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}
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void machine_shutdown(void)
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{
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smp_send_stop();
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while (num_online_cpus() > 1) {
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cpu_relax();
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mdelay(1);
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}
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}
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void machine_kexec(struct kimage *image)
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{
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#ifdef CONFIG_64BIT
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Elf64_Fdesc desc;
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#endif
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void (*reloc)(unsigned long head,
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unsigned long start,
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unsigned long phys);
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unsigned long phys = page_to_phys(image->control_code_page);
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void *virt = (void *)__fix_to_virt(FIX_TEXT_KEXEC);
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struct kimage_arch *arch = &image->arch;
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set_fixmap(FIX_TEXT_KEXEC, phys);
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flush_cache_all();
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#ifdef CONFIG_64BIT
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reloc = (void *)&desc;
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desc.addr = (long long)virt;
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#else
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reloc = (void *)virt;
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#endif
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memcpy(virt, dereference_function_descriptor(relocate_new_kernel),
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relocate_new_kernel_size);
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*(unsigned long *)(virt + kexec_cmdline_offset) = arch->cmdline;
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*(unsigned long *)(virt + kexec_initrd_start_offset) = arch->initrd_start;
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*(unsigned long *)(virt + kexec_initrd_end_offset) = arch->initrd_end;
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*(unsigned long *)(virt + kexec_free_mem_offset) = PAGE0->mem_free;
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flush_cache_all();
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flush_tlb_all();
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local_irq_disable();
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reloc(image->head & PAGE_MASK, image->start, phys);
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}
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int machine_kexec_prepare(struct kimage *image)
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{
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kexec_image_info(image);
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return 0;
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}
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149
arch/parisc/kernel/relocate_kernel.S
Normal file
149
arch/parisc/kernel/relocate_kernel.S
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@ -0,0 +1,149 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/linkage.h>
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#include <linux/kexec.h>
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#include <asm/assembly.h>
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#include <asm/asm-offsets.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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#include <asm/psw.h>
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.level PA_ASM_LEVEL
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.macro kexec_param name
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.align 8
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ENTRY(kexec\()_\name)
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#ifdef CONFIG_64BIT
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.dword 0
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#else
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.word 0
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#endif
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ENTRY(kexec\()_\name\()_offset)
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.word kexec\()_\name - relocate_new_kernel
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.endm
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.text
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/* args:
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* r26 - kimage->head
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* r25 - start address of kernel
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* r24 - physical address of relocate code
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*/
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ENTRY_CFI(relocate_new_kernel)
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0: copy %arg1, %rp
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/* disable I and Q bit, so we are allowed to execute RFI */
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rsm PSW_SM_I, %r0
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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rsm PSW_SM_Q, %r0
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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/*
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* After return-from-interrupt, we want to run without Code/Data
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* translation enabled just like on a normal boot.
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*/
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/* calculate new physical execution address */
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ldo 1f-0b(%arg2), %r1
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mtctl %r0, %cr17 /* IIASQ */
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mtctl %r0, %cr17 /* IIASQ */
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mtctl %r1, %cr18 /* IIAOQ */
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ldo 4(%r1),%r1
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mtctl %r1, %cr18 /* IIAOQ */
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#ifdef CONFIG_64BIT
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depdi,z 1, PSW_W_BIT, 1, %r1
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mtctl %r1, %cr22 /* IPSW */
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#else
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mtctl %r0, %cr22 /* IPSW */
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#endif
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/* lets go... */
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rfi
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1: nop
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nop
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.Lloop:
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LDREG,ma REG_SZ(%arg0), %r3
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/* If crash kernel, no copy needed */
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cmpib,COND(=),n 0,%r3,boot
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bb,<,n %r3, 31 - IND_DONE_BIT, boot
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bb,>=,n %r3, 31 - IND_INDIRECTION_BIT, .Lnotind
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/* indirection, load and restart */
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movb %r3, %arg0, .Lloop
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depi 0, 31, PAGE_SHIFT, %arg0
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.Lnotind:
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bb,>=,n %r3, 31 - IND_DESTINATION_BIT, .Lnotdest
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b .Lloop
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copy %r3, %r20
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.Lnotdest:
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bb,>= %r3, 31 - IND_SOURCE_BIT, .Lloop
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depi 0, 31, PAGE_SHIFT, %r3
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copy %r3, %r21
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/* copy page */
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copy %r0, %r18
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zdepi 1, 31 - PAGE_SHIFT, 1, %r18
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add %r20, %r18, %r17
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depi 0, 31, PAGE_SHIFT, %r20
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.Lcopy:
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copy %r20, %r12
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LDREG,ma REG_SZ(%r21), %r8
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LDREG,ma REG_SZ(%r21), %r9
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LDREG,ma REG_SZ(%r21), %r10
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LDREG,ma REG_SZ(%r21), %r11
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STREG,ma %r8, REG_SZ(%r20)
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STREG,ma %r9, REG_SZ(%r20)
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STREG,ma %r10, REG_SZ(%r20)
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STREG,ma %r11, REG_SZ(%r20)
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#ifndef CONFIG_64BIT
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LDREG,ma REG_SZ(%r21), %r8
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LDREG,ma REG_SZ(%r21), %r9
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LDREG,ma REG_SZ(%r21), %r10
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LDREG,ma REG_SZ(%r21), %r11
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STREG,ma %r8, REG_SZ(%r20)
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STREG,ma %r9, REG_SZ(%r20)
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STREG,ma %r10, REG_SZ(%r20)
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STREG,ma %r11, REG_SZ(%r20)
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#endif
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fdc %r0(%r12)
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cmpb,COND(<<) %r20,%r17,.Lcopy
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fic (%sr4, %r12)
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b,n .Lloop
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boot:
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mtctl %r0, %cr15
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LDREG kexec_free_mem-0b(%arg2), %arg0
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LDREG kexec_cmdline-0b(%arg2), %arg1
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LDREG kexec_initrd_end-0b(%arg2), %arg3
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LDREG kexec_initrd_start-0b(%arg2), %arg2
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bv,n %r0(%rp)
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ENDPROC_CFI(relocate_new_kernel);
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ENTRY(relocate_new_kernel_size)
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.word relocate_new_kernel_size - relocate_new_kernel
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kexec_param cmdline
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kexec_param initrd_start
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kexec_param initrd_end
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kexec_param free_mem
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@ -31,6 +31,7 @@
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#define KEXEC_ARCH_DEFAULT ( 0 << 16)
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#define KEXEC_ARCH_386 ( 3 << 16)
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#define KEXEC_ARCH_68K ( 4 << 16)
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#define KEXEC_ARCH_PARISC (15 << 16)
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#define KEXEC_ARCH_X86_64 (62 << 16)
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#define KEXEC_ARCH_PPC (20 << 16)
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#define KEXEC_ARCH_PPC64 (21 << 16)
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