diff options
| author | Sven Schnelle | 2021-09-23 21:22:52 +0200 |
|---|---|---|
| committer | Vasily Gorbik | 2021-10-26 15:21:31 +0200 |
| commit | 5ecb2da660ab8eddafe059a6a8a708465db89ca2 (patch) | |
| tree | 32c6e3e9d714f449991eb94d36ac0b86f7d24ef8 /arch/s390/boot | |
| parent | 277c8389386e2ccb8417afe4e36f67fc5dcd735d (diff) | |
s390: support command lines longer than 896 bytes
Currently s390 supports a fixed maximum command line length of 896
bytes. This isn't enough as some installers are trying to pass all
configuration data via kernel command line, and even with zfcp alone
it is easy to generate really long command lines. Therefore extend
the command line to 4 kbytes.
In the parm area where the command line is stored there is no indication
of the maximum allowed length, so a new field which contains the maximum
length is added.
The parm area has always been initialized to zero, so with old kernels
this field would read zero. This is important because tools like zipl
could read this field. If it contains a number larger than zero zipl
knows the maximum length that can be stored in the parm area, otherwise
it must assume that it is booting a legacy kernel and only 896 bytes are
available.
The removing of trailing whitespace in head.S is also removed because
code to do this is already present in setup_boot_command_line().
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/boot')
| -rw-r--r-- | arch/s390/boot/head.S | 35 | ||||
| -rw-r--r-- | arch/s390/boot/ipl_parm.c | 4 |
2 files changed, 14 insertions, 25 deletions
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S index 5d3fc69a505c..3a252d140c55 100644 --- a/arch/s390/boot/head.S +++ b/arch/s390/boot/head.S @@ -184,35 +184,23 @@ iplstart: bas %r14,.Lloader # load parameter file ltr %r2,%r2 # got anything ? bz .Lnopf - chi %r2,895 - bnh .Lnotrunc - la %r2,895 + l %r3,MAX_COMMAND_LINE_SIZE+ARCH_OFFSET-PARMAREA(%r12) + ahi %r3,-1 + clr %r2,%r3 + bl .Lnotrunc + lr %r2,%r3 .Lnotrunc: l %r4,.Linitrd clc 0(3,%r4),.L_hdr # if it is HDRx bz .Lagain1 # skip dataset header clc 0(3,%r4),.L_eof # if it is EOFx bz .Lagain1 # skip dateset trailer - la %r5,0(%r4,%r2) - lr %r3,%r2 - la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line - mvc 0(256,%r3),0(%r4) - mvc 256(256,%r3),256(%r4) - mvc 512(256,%r3),512(%r4) - mvc 768(122,%r3),768(%r4) - slr %r0,%r0 - b .Lcntlp -.Ldelspc: - ic %r0,0(%r2,%r3) - chi %r0,0x20 # is it a space ? - be .Lcntlp - ahi %r2,1 - b .Leolp -.Lcntlp: - brct %r2,.Ldelspc -.Leolp: - slr %r0,%r0 - stc %r0,0(%r2,%r3) # terminate buffer + + lr %r5,%r2 + la %r6,COMMAND_LINE-PARMAREA(%r12) + lr %r7,%r2 + ahi %r7,1 + mvcl %r6,%r4 .Lnopf: # @@ -394,6 +382,7 @@ SYM_DATA_START(parmarea) .quad 0 # OLDMEM_BASE .quad 0 # OLDMEM_SIZE .quad kernel_version # points to kernel version string + .quad COMMAND_LINE_SIZE .org COMMAND_LINE .byte "root=/dev/ram0 ro" diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c index 0f84c072625e..9ed7e29c81d9 100644 --- a/arch/s390/boot/ipl_parm.c +++ b/arch/s390/boot/ipl_parm.c @@ -170,10 +170,10 @@ static inline int has_ebcdic_char(const char *str) void setup_boot_command_line(void) { - parmarea.command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0; + parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0; /* convert arch command line to ascii if necessary */ if (has_ebcdic_char(parmarea.command_line)) - EBCASC(parmarea.command_line, ARCH_COMMAND_LINE_SIZE); + EBCASC(parmarea.command_line, COMMAND_LINE_SIZE); /* copy arch command line */ strcpy(early_command_line, strim(parmarea.command_line)); |