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-rw-r--r--arch/powerpc/kernel/head_64.S39
1 files changed, 33 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 84856bee33a5..69489bd3210c 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -97,6 +97,12 @@ __secondary_hold_spinloop:
97__secondary_hold_acknowledge: 97__secondary_hold_acknowledge:
98 .llong 0x0 98 .llong 0x0
99 99
100 /* This flag is set by purgatory if we should be a kdump kernel. */
101 /* Do not move this variable as purgatory knows about it. */
102 .globl __kdump_flag
103__kdump_flag:
104 .llong 0x0
105
100#ifdef CONFIG_PPC_ISERIES 106#ifdef CONFIG_PPC_ISERIES
101 /* 107 /*
102 * At offset 0x20, there is a pointer to iSeries LPAR data. 108 * At offset 0x20, there is a pointer to iSeries LPAR data.
@@ -1384,7 +1390,13 @@ _STATIC(__after_prom_start)
1384 /* process relocations for the final address of the kernel */ 1390 /* process relocations for the final address of the kernel */
1385 lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */ 1391 lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */
1386 sldi r25,r25,32 1392 sldi r25,r25,32
1387 mr r3,r25 1393#ifdef CONFIG_CRASH_DUMP
1394 ld r7,__kdump_flag-_stext(r26)
1395 cmpldi cr0,r7,1 /* kdump kernel ? - stay where we are */
1396 bne 1f
1397 add r25,r25,r26
1398#endif
13991: mr r3,r25
1388 bl .relocate 1400 bl .relocate
1389#endif 1401#endif
1390 1402
@@ -1398,11 +1410,26 @@ _STATIC(__after_prom_start)
1398 li r3,0 /* target addr */ 1410 li r3,0 /* target addr */
1399 mr. r4,r26 /* In some cases the loader may */ 1411 mr. r4,r26 /* In some cases the loader may */
1400 beq 9f /* have already put us at zero */ 1412 beq 9f /* have already put us at zero */
1401 lis r5,(copy_to_here - _stext)@ha
1402 addi r5,r5,(copy_to_here - _stext)@l /* # bytes of memory to copy */
1403 li r6,0x100 /* Start offset, the first 0x100 */ 1413 li r6,0x100 /* Start offset, the first 0x100 */
1404 /* bytes were copied earlier. */ 1414 /* bytes were copied earlier. */
1405 1415
1416#ifdef CONFIG_CRASH_DUMP
1417/*
1418 * Check if the kernel has to be running as relocatable kernel based on the
1419 * variable __kdump_flag, if it is set the kernel is treated as relocatable
1420 * kernel, otherwise it will be moved to PHYSICAL_START
1421 */
1422 ld r7,__kdump_flag-_stext(r26)
1423 cmpldi cr0,r7,1
1424 bne 3f
1425
1426 li r5,__end_interrupts - _stext /* just copy interrupts */
1427 b 5f
14283:
1429#endif
1430 lis r5,(copy_to_here - _stext)@ha
1431 addi r5,r5,(copy_to_here - _stext)@l /* # bytes of memory to copy */
1432
1406 bl .copy_and_flush /* copy the first n bytes */ 1433 bl .copy_and_flush /* copy the first n bytes */
1407 /* this includes the code being */ 1434 /* this includes the code being */
1408 /* executed here. */ 1435 /* executed here. */
@@ -1411,15 +1438,15 @@ _STATIC(__after_prom_start)
1411 mtctr r8 1438 mtctr r8
1412 bctr 1439 bctr
1413 1440
1441p_end: .llong _end - _stext
1442
14144: /* Now copy the rest of the kernel up to _end */ 14434: /* Now copy the rest of the kernel up to _end */
1415 addis r5,r26,(p_end - _stext)@ha 1444 addis r5,r26,(p_end - _stext)@ha
1416 ld r5,(p_end - _stext)@l(r5) /* get _end */ 1445 ld r5,(p_end - _stext)@l(r5) /* get _end */
1417 bl .copy_and_flush /* copy the rest */ 14465: bl .copy_and_flush /* copy the rest */
1418 1447
14199: b .start_here_multiplatform 14489: b .start_here_multiplatform
1420 1449
1421p_end: .llong _end - _stext
1422
1423/* 1450/*
1424 * Copy routine used to copy the kernel to start at physical address 0 1451 * Copy routine used to copy the kernel to start at physical address 0
1425 * and flush and invalidate the caches as needed. 1452 * and flush and invalidate the caches as needed.