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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-09-20 09:58:41 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-09-20 09:58:41 -0400
commit65912a84c0f33304fa5ea004c7b6ee58d5f5572e (patch)
treea9a684ed713f09cd47d6bd1cfe6872cf757feb58 /arch
parent4ba069b802c29eee066385f9826e2d83716626b4 (diff)
[S390] initrd vs. bootmem bitmap.
Move initrd if the bitmap of the bootmem allocator would overwrite it. In addition this patch sets the default size and address of the initrd to 0. Therefore all boot loaders must set the initrd size and address correctly. This is especially relevant for ftp boot via HMC/SE, where this change requires a special patch file entry in the .ins file which sets these two values contained at address 0x10408 and 0x10410. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/head.S10
-rw-r--r--arch/s390/kernel/head31.S4
-rw-r--r--arch/s390/kernel/head64.S4
-rw-r--r--arch/s390/kernel/setup.c41
4 files changed, 48 insertions, 11 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index adad8863ee2f..a6e9bdb53591 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -272,7 +272,7 @@ iplstart:
272# load parameter file from ipl device 272# load parameter file from ipl device
273# 273#
274.Lagain1: 274.Lagain1:
275 l %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # ramdisk loc. is temp 275 l %r2,.Linitrd # ramdisk loc. is temp
276 bas %r14,.Lloader # load parameter file 276 bas %r14,.Lloader # load parameter file
277 ltr %r2,%r2 # got anything ? 277 ltr %r2,%r2 # got anything ?
278 bz .Lnopf 278 bz .Lnopf
@@ -280,7 +280,7 @@ iplstart:
280 bnh .Lnotrunc 280 bnh .Lnotrunc
281 la %r2,895 281 la %r2,895
282.Lnotrunc: 282.Lnotrunc:
283 l %r4,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) 283 l %r4,.Linitrd
284 clc 0(3,%r4),.L_hdr # if it is HDRx 284 clc 0(3,%r4),.L_hdr # if it is HDRx
285 bz .Lagain1 # skip dataset header 285 bz .Lagain1 # skip dataset header
286 clc 0(3,%r4),.L_eof # if it is EOFx 286 clc 0(3,%r4),.L_eof # if it is EOFx
@@ -323,14 +323,15 @@ iplstart:
323# load ramdisk from ipl device 323# load ramdisk from ipl device
324# 324#
325.Lagain2: 325.Lagain2:
326 l %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # addr of ramdisk 326 l %r2,.Linitrd # addr of ramdisk
327 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
327 bas %r14,.Lloader # load ramdisk 328 bas %r14,.Lloader # load ramdisk
328 st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of ramdisk 329 st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of ramdisk
329 ltr %r2,%r2 330 ltr %r2,%r2
330 bnz .Lrdcont 331 bnz .Lrdcont
331 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found 332 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
332.Lrdcont: 333.Lrdcont:
333 l %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) 334 l %r2,.Linitrd
334 335
335 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx 336 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
336 bz .Lagain2 337 bz .Lagain2
@@ -379,6 +380,7 @@ iplstart:
379 l %r1,.Lstartup 380 l %r1,.Lstartup
380 br %r1 381 br %r1
381 382
383.Linitrd:.long _end + 0x400000 # default address of initrd
382.Lparm: .long PARMAREA 384.Lparm: .long PARMAREA
383.Lstartup: .long startup 385.Lstartup: .long startup
384.Lcvtab:.long _ebcasc # ebcdic to ascii table 386.Lcvtab:.long _ebcasc # ebcdic to ascii table
diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S
index a4dc61f3285e..0e46077d7140 100644
--- a/arch/s390/kernel/head31.S
+++ b/arch/s390/kernel/head31.S
@@ -26,8 +26,8 @@ startup:basr %r13,0 # get base
26# 26#
27 .org PARMAREA 27 .org PARMAREA
28 .long 0,0 # IPL_DEVICE 28 .long 0,0 # IPL_DEVICE
29 .long 0,RAMDISK_ORIGIN # INITRD_START 29 .long 0,0 # INITRD_START
30 .long 0,RAMDISK_SIZE # INITRD_SIZE 30 .long 0,0 # INITRD_SIZE
31 31
32 .org COMMAND_LINE 32 .org COMMAND_LINE
33 .byte "root=/dev/ram0 ro" 33 .byte "root=/dev/ram0 ro"
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 9d80c5b1ef95..3e0341acd04e 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -26,8 +26,8 @@ startup:basr %r13,0 # get base
26# 26#
27 .org PARMAREA 27 .org PARMAREA
28 .quad 0 # IPL_DEVICE 28 .quad 0 # IPL_DEVICE
29 .quad RAMDISK_ORIGIN # INITRD_START 29 .quad 0 # INITRD_START
30 .quad RAMDISK_SIZE # INITRD_SIZE 30 .quad 0 # INITRD_SIZE
31 31
32 .org COMMAND_LINE 32 .org COMMAND_LINE
33 .byte "root=/dev/ram0 ro" 33 .byte "root=/dev/ram0 ro"
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index c902f059c7aa..89051e8a5d8d 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -37,6 +37,7 @@
37#include <linux/kernel_stat.h> 37#include <linux/kernel_stat.h>
38#include <linux/device.h> 38#include <linux/device.h>
39#include <linux/notifier.h> 39#include <linux/notifier.h>
40#include <linux/pfn.h>
40 41
41#include <asm/uaccess.h> 42#include <asm/uaccess.h>
42#include <asm/system.h> 43#include <asm/system.h>
@@ -501,13 +502,47 @@ setup_memory(void)
501 * partially used pages are not usable - thus 502 * partially used pages are not usable - thus
502 * we are rounding upwards: 503 * we are rounding upwards:
503 */ 504 */
504 start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT; 505 start_pfn = PFN_UP(__pa(&_end));
505 end_pfn = max_pfn = memory_end >> PAGE_SHIFT; 506 end_pfn = max_pfn = PFN_DOWN(memory_end);
506 507
507 /* Initialize storage key for kernel pages */ 508 /* Initialize storage key for kernel pages */
508 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++) 509 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
509 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); 510 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
510 511
512#ifdef CONFIG_BLK_DEV_INITRD
513 /*
514 * Move the initrd in case the bitmap of the bootmem allocater
515 * would overwrite it.
516 */
517
518 if (INITRD_START && INITRD_SIZE) {
519 unsigned long bmap_size;
520 unsigned long start;
521
522 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
523 bmap_size = PFN_PHYS(bmap_size);
524
525 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
526 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
527
528 if (start + INITRD_SIZE > memory_end) {
529 printk("initrd extends beyond end of memory "
530 "(0x%08lx > 0x%08lx)\n"
531 "disabling initrd\n",
532 start + INITRD_SIZE, memory_end);
533 INITRD_START = INITRD_SIZE = 0;
534 } else {
535 printk("Moving initrd (0x%08lx -> 0x%08lx, "
536 "size: %ld)\n",
537 INITRD_START, start, INITRD_SIZE);
538 memmove((void *) start, (void *) INITRD_START,
539 INITRD_SIZE);
540 INITRD_START = start;
541 }
542 }
543 }
544#endif
545
511 /* 546 /*
512 * Initialize the boot-time allocator (with low memory only): 547 * Initialize the boot-time allocator (with low memory only):
513 */ 548 */
@@ -559,7 +594,7 @@ setup_memory(void)
559 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); 594 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
560 595
561#ifdef CONFIG_BLK_DEV_INITRD 596#ifdef CONFIG_BLK_DEV_INITRD
562 if (INITRD_START) { 597 if (INITRD_START && INITRD_SIZE) {
563 if (INITRD_START + INITRD_SIZE <= memory_end) { 598 if (INITRD_START + INITRD_SIZE <= memory_end) {
564 reserve_bootmem(INITRD_START, INITRD_SIZE); 599 reserve_bootmem(INITRD_START, INITRD_SIZE);
565 initrd_start = INITRD_START; 600 initrd_start = INITRD_START;