From d0d249d75dda1b101624316a52d117be07b8ccff Mon Sep 17 00:00:00 2001 From: Philipp Rudo Date: Wed, 6 Mar 2019 17:36:26 +0100 Subject: [PATCH] s390/kexec_file: Simplify parmarea access Access the parmarea in head.S via a struct instead of individual offsets. While at it make the fields in the parmarea .quads. Signed-off-by: Philipp Rudo Signed-off-by: Martin Schwidefsky --- arch/s390/boot/head.S | 11 ++++++----- arch/s390/include/asm/kexec.h | 7 ++++--- arch/s390/include/asm/setup.h | 10 ++++++++++ arch/s390/kernel/kexec_elf.c | 1 + arch/s390/kernel/kexec_image.c | 1 + arch/s390/kernel/machine_kexec_file.c | 23 ++++++----------------- 6 files changed, 28 insertions(+), 25 deletions(-) diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S index ce2cbbc41742..d585c4dbdac7 100644 --- a/arch/s390/boot/head.S +++ b/arch/s390/boot/head.S @@ -323,13 +323,14 @@ ENTRY(startup_kdump) # # params at 10400 (setup.h) +# Must be keept in sync with struct parmarea in setup.h # .org PARMAREA - .long 0,0 # IPL_DEVICE - .long 0,0 # INITRD_START - .long 0,0 # INITRD_SIZE - .long 0,0 # OLDMEM_BASE - .long 0,0 # OLDMEM_SIZE + .quad 0 # IPL_DEVICE + .quad 0 # INITRD_START + .quad 0 # INITRD_SIZE + .quad 0 # OLDMEM_BASE + .quad 0 # OLDMEM_SIZE .org COMMAND_LINE .byte "root=/dev/ram0 ro" diff --git a/arch/s390/include/asm/kexec.h b/arch/s390/include/asm/kexec.h index 825dd0f7f221..08dc2b74858d 100644 --- a/arch/s390/include/asm/kexec.h +++ b/arch/s390/include/asm/kexec.h @@ -11,6 +11,7 @@ #include #include +#include /* * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return. * I.e. Maximum page that is mapped directly into kernel memory, @@ -51,11 +52,11 @@ struct s390_load_data { /* Pointer to the kernel buffer. Used to register cmdline etc.. */ void *kernel_buf; + /* Parmarea in the kernel buffer. */ + struct parmarea *parm; + /* Total size of loaded segments in memory. Used as an offset. */ size_t memsz; - - /* Load address of initrd. Used to register INITRD_START in kernel. */ - unsigned long initrd_load_addr; }; int kexec_file_add_purgatory(struct kimage *image, diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h index efda97804aa4..b603cc09c895 100644 --- a/arch/s390/include/asm/setup.h +++ b/arch/s390/include/asm/setup.h @@ -65,6 +65,16 @@ #define OLDMEM_SIZE (*(unsigned long *) (OLDMEM_SIZE_OFFSET)) #define COMMAND_LINE ((char *) (COMMAND_LINE_OFFSET)) +struct parmarea { + unsigned long ipl_device; /* 0x10400 */ + unsigned long initrd_start; /* 0x10408 */ + unsigned long initrd_size; /* 0x10410 */ + unsigned long oldmem_base; /* 0x10418 */ + unsigned long oldmem_size; /* 0x10420 */ + char pad1[0x10480 - 0x10428]; /* 0x10428 - 0x10480 */ + char command_line[ARCH_COMMAND_LINE_SIZE]; /* 0x10480 */ +}; + extern int noexec_disabled; extern int memory_end_set; extern unsigned long memory_end; diff --git a/arch/s390/kernel/kexec_elf.c b/arch/s390/kernel/kexec_elf.c index 5cf340b778f1..1cdf90767cba 100644 --- a/arch/s390/kernel/kexec_elf.c +++ b/arch/s390/kernel/kexec_elf.c @@ -42,6 +42,7 @@ static int kexec_file_add_elf_kernel(struct kimage *image, if (entry - phdr->p_paddr < phdr->p_memsz) { data->kernel_buf = buf.buffer; + data->parm = buf.buffer + PARMAREA; data->memsz += STARTUP_NORMAL_OFFSET; buf.buffer += STARTUP_NORMAL_OFFSET; diff --git a/arch/s390/kernel/kexec_image.c b/arch/s390/kernel/kexec_image.c index 3800852595e8..d9025adc2bbb 100644 --- a/arch/s390/kernel/kexec_image.c +++ b/arch/s390/kernel/kexec_image.c @@ -32,6 +32,7 @@ static int kexec_file_add_image_kernel(struct kimage *image, ret = kexec_add_buffer(&buf); data->kernel_buf = kernel; + data->parm = (void *)kernel + PARMAREA; data->memsz += buf.memsz + STARTUP_NORMAL_OFFSET; return ret; diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c index 32023b4f9dc0..8a85ecd8428c 100644 --- a/arch/s390/kernel/machine_kexec_file.c +++ b/arch/s390/kernel/machine_kexec_file.c @@ -25,24 +25,12 @@ int *kexec_file_update_kernel(struct kimage *image, if (image->cmdline_buf_len >= ARCH_COMMAND_LINE_SIZE) return ERR_PTR(-EINVAL); - if (image->cmdline_buf_len) - memcpy(data->kernel_buf + COMMAND_LINE_OFFSET, - image->cmdline_buf, image->cmdline_buf_len); + memcpy(data->parm->command_line, image->cmdline_buf, + image->cmdline_buf_len); if (image->type == KEXEC_TYPE_CRASH) { - loc = (unsigned long *)(data->kernel_buf + OLDMEM_BASE_OFFSET); - *loc = crashk_res.start; - - loc = (unsigned long *)(data->kernel_buf + OLDMEM_SIZE_OFFSET); - *loc = crashk_res.end - crashk_res.start + 1; - } - - if (image->initrd_buf) { - loc = (unsigned long *)(data->kernel_buf + INITRD_START_OFFSET); - *loc = data->initrd_load_addr; - - loc = (unsigned long *)(data->kernel_buf + INITRD_SIZE_OFFSET); - *loc = image->initrd_buf_len; + data->parm->oldmem_base = crashk_res.start; + data->parm->oldmem_size = crashk_res.end - crashk_res.start + 1; } return NULL; @@ -127,7 +115,8 @@ int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data, buf.mem += crashk_res.start; buf.memsz = buf.bufsz; - data->initrd_load_addr = buf.mem; + data->parm->initrd_start = buf.mem; + data->parm->initrd_size = buf.memsz; data->memsz += buf.memsz; ret = kexec_add_buffer(&buf); -- 2.45.2