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s390/boot: convert parmarea to C

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Convert parmarea to C, which makes it much easier to initialize it. No need
to keep offsets in assembler code in sync with struct parmarea anymore.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2022-04-25 21:24:56 +02:00
parent 834979c27f
commit f84d88ed3b
4 changed files with 12 additions and 21 deletions
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20
arch/s390/boot/head.S
View file

@ -333,23 +333,3 @@ SYM_CODE_START_LOCAL(startup_pgm_check_handler)
lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r8)
lpswe __LC_RETURN_PSW # disabled wait
SYM_CODE_END(startup_pgm_check_handler)
#
# params at 10400 (setup.h)
# Must be keept in sync with struct parmarea in setup.h
#
.org PARMAREA - IPL_START
SYM_DATA_START(parmarea)
.quad 0 # IPL_DEVICE
.quad 0 # INITRD_START
.quad 0 # INITRD_SIZE
.quad 0 # OLDMEM_BASE
.quad 0 # OLDMEM_SIZE
.quad kernel_version # points to kernel version string
.quad COMMAND_LINE_SIZE
.org COMMAND_LINE - IPL_START
.byte "root=/dev/ram0 ro"
.byte 0
.org PARMAREA+__PARMAREA_SIZE - IPL_START
SYM_DATA_END(parmarea)

2
arch/s390/boot/ipl_data.c
View file

@ -44,7 +44,7 @@ struct ipl_lowcore {
* that to succeed the two initial CCWs, and the 0x40 fill bytes must
* be present.
*/
struct ipl_lowcore ipl_lowcore __section(".ipldata") = {
static struct ipl_lowcore ipl_lowcore __used __section(".ipldata") = {
.ipl_psw = { .mask = PSW32_MASK_BASE, .addr = PSW32_ADDR_AMODE | IPL_START },
.ccwpgm = {
[ 0] = CCW0(CCW_CMD_READ_IPL, 0x018, 0x50, CCW_FLAG_SLI | CCW_FLAG_CC),

7
arch/s390/boot/ipl_parm.c
View file

@ -8,9 +8,16 @@
#include <asm/sections.h>
#include <asm/boot_data.h>
#include <asm/facility.h>
#include <asm/setup.h>
#include <asm/uv.h>
#include "boot.h"
struct parmarea parmarea __section(".parmarea") = {
.kernel_version = (unsigned long)kernel_version,
.max_command_line_size = COMMAND_LINE_SIZE,
.command_line = "root=/dev/ram0 ro",
};
char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
int __bootdata(noexec_disabled);

4
arch/s390/boot/vmlinux.lds.S
View file

@ -23,6 +23,10 @@ SECTIONS
HEAD_TEXT
_ehead = . ;
}
. = PARMAREA;
.parmarea : {
*(.parmarea)
}
.text : {
_text = .; /* Text */
*(.text)