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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 <prudo@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Philipp Rudo 2019-03-06 17:36:26 +01:00 committed by Martin Schwidefsky
parent 4c0f032d49
commit d0d249d75d
6 changed files with 28 additions and 25 deletions
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11
arch/s390/boot/head.S
View File

@ -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"

7
arch/s390/include/asm/kexec.h
View File

@ -11,6 +11,7 @@
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/setup.h>
/*
* 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,

10
arch/s390/include/asm/setup.h
View File

@ -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;

1
arch/s390/kernel/kexec_elf.c
View File

@ -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;

1
arch/s390/kernel/kexec_image.c
View File

@ -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;

23
arch/s390/kernel/machine_kexec_file.c
View File

@ -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);