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author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-16 15:38:31 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-16 15:38:31 -0700 |
commit | d0a16fe934383ecdb605ab9312d700fb9099f75e (patch) | |
tree | b9763fcb1b2c7426adbffc6f0f921c79f3230609 /arch/parisc/kernel/kexec.c | |
parent | 76f0f227cffb570bc5ce343b1750f14907371d80 (diff) | |
parent | fcc16a9e24ba6a2bb9f3af43d892eeec2a435d18 (diff) | |
download | linux-d0a16fe934383ecdb605ab9312d700fb9099f75e.tar.gz linux-d0a16fe934383ecdb605ab9312d700fb9099f75e.tar.bz2 linux-d0a16fe934383ecdb605ab9312d700fb9099f75e.zip |
Merge branch 'parisc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
Pull parisc updates from Helge Deller:
- Make the powerpc implementation to read elf files available as a
public kexec interface so it can be re-used on other architectures
(Sven)
- Implement kexec on parisc (Sven)
- Add kprobes on ftrace on parisc (Sven)
- Fix kernel crash with HSC-PCI cards based on card-mode Dino
- Add assembly implementations for memset, strlen, strcpy, strncpy and
strcat
- Some cleanups, documentation updates, warning fixes, ...
* 'parisc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (25 commits)
parisc: Have git ignore generated real2.S and firmware.c
parisc: Disable HP HSC-PCI Cards to prevent kernel crash
parisc: add support for kexec_file_load() syscall
parisc: wire up kexec_file_load syscall
parisc: add kexec syscall support
parisc: add __pdc_cpu_rendezvous()
kprobes/parisc: remove arch_kprobe_on_func_entry()
kexec_elf: support 32 bit ELF files
kexec_elf: remove unused variable in kexec_elf_load()
kexec_elf: remove Elf_Rel macro
kexec_elf: remove PURGATORY_STACK_SIZE
kexec_elf: remove parsing of section headers
kexec_elf: change order of elf_*_to_cpu() functions
kexec: add KEXEC_ELF
parisc: Save some bytes in dino driver
parisc: Drop comments which are already in pci.h
parisc: Convert eisa_enumerator to use pr_cont()
parisc: Avoid warning when loading hppb driver
parisc: speed up flush_tlb_all_local with qemu
parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMU
...
Diffstat (limited to 'arch/parisc/kernel/kexec.c')
-rw-r--r-- | arch/parisc/kernel/kexec.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/arch/parisc/kernel/kexec.c b/arch/parisc/kernel/kexec.c new file mode 100644 index 000000000000..5eb7f30edc1f --- /dev/null +++ b/arch/parisc/kernel/kexec.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/kernel.h> +#include <linux/console.h> +#include <linux/kexec.h> +#include <linux/delay.h> +#include <asm/cacheflush.h> +#include <asm/sections.h> + +extern void relocate_new_kernel(unsigned long head, + unsigned long start, + unsigned long phys); + +extern const unsigned int relocate_new_kernel_size; +extern unsigned int kexec_initrd_start_offset; +extern unsigned int kexec_initrd_end_offset; +extern unsigned int kexec_cmdline_offset; +extern unsigned int kexec_free_mem_offset; + +static void kexec_show_segment_info(const struct kimage *kimage, + unsigned long n) +{ + pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n", + n, + kimage->segment[n].mem, + kimage->segment[n].mem + kimage->segment[n].memsz, + (unsigned long)kimage->segment[n].memsz, + (unsigned long)kimage->segment[n].memsz / PAGE_SIZE); +} + +static void kexec_image_info(const struct kimage *kimage) +{ + unsigned long i; + + pr_debug("kexec kimage info:\n"); + pr_debug(" type: %d\n", kimage->type); + pr_debug(" start: %lx\n", kimage->start); + pr_debug(" head: %lx\n", kimage->head); + pr_debug(" nr_segments: %lu\n", kimage->nr_segments); + + for (i = 0; i < kimage->nr_segments; i++) + kexec_show_segment_info(kimage, i); + +#ifdef CONFIG_KEXEC_FILE + if (kimage->file_mode) { + pr_debug("cmdline: %.*s\n", (int)kimage->cmdline_buf_len, + kimage->cmdline_buf); + } +#endif +} + +void machine_kexec_cleanup(struct kimage *kimage) +{ +} + +void machine_crash_shutdown(struct pt_regs *regs) +{ +} + +void machine_shutdown(void) +{ + smp_send_stop(); + while (num_online_cpus() > 1) { + cpu_relax(); + mdelay(1); + } +} + +void machine_kexec(struct kimage *image) +{ +#ifdef CONFIG_64BIT + Elf64_Fdesc desc; +#endif + void (*reloc)(unsigned long head, + unsigned long start, + unsigned long phys); + + unsigned long phys = page_to_phys(image->control_code_page); + void *virt = (void *)__fix_to_virt(FIX_TEXT_KEXEC); + struct kimage_arch *arch = &image->arch; + + set_fixmap(FIX_TEXT_KEXEC, phys); + + flush_cache_all(); + +#ifdef CONFIG_64BIT + reloc = (void *)&desc; + desc.addr = (long long)virt; +#else + reloc = (void *)virt; +#endif + + memcpy(virt, dereference_function_descriptor(relocate_new_kernel), + relocate_new_kernel_size); + + *(unsigned long *)(virt + kexec_cmdline_offset) = arch->cmdline; + *(unsigned long *)(virt + kexec_initrd_start_offset) = arch->initrd_start; + *(unsigned long *)(virt + kexec_initrd_end_offset) = arch->initrd_end; + *(unsigned long *)(virt + kexec_free_mem_offset) = PAGE0->mem_free; + + flush_cache_all(); + flush_tlb_all(); + local_irq_disable(); + + reloc(image->head & PAGE_MASK, image->start, phys); +} + +int machine_kexec_prepare(struct kimage *image) +{ + kexec_image_info(image); + return 0; +} |