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powerpc/book3e: support CONFIG_RELOCATABLE 

book3e is different with book3s since 3s includes the exception
vectors code in head_64.S as it relies on absolute addressing
which is only possible within this compilation unit. So we have
to get that label address with got.

And when boot a relocated kernel, we should reset ipvr properly again
after .relocate.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
[scottwood: cleanup and ifdef removal]
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Tiejun Chen 2015-10-06 22:48:15 -05:00 committed by Scott Wood
parent 835c031c98
commit 1cb6e06492
3 changed files with 28 additions and 7 deletions
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4
arch/powerpc/include/asm/exception-64e.h
View File

@ -204,8 +204,8 @@ exc_##label##_book3e:
#endif
#define SET_IVOR(vector_number, vector_offset) \
li r3,vector_offset@l; \
ori r3,r3,interrupt_base_book3e@l; \
LOAD_REG_ADDR(r3,interrupt_base_book3e);\
ori r3,r3,vector_offset@l; \
mtspr SPRN_IVOR##vector_number,r3;
#endif /* _ASM_POWERPC_EXCEPTION_64E_H */

9
arch/powerpc/kernel/exceptions-64e.S
View File

@ -1351,7 +1351,10 @@ skpinv: addi r6,r6,1 /* Increment */
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
*/
/* Now we branch the new virtual address mapped by this entry */
LOAD_REG_IMMEDIATE(r6,2f)
bl 1f /* Find our address */
1: mflr r6
addi r6,r6,(2f - 1b)
tovirt(r6,r6)
lis r7,MSR_KERNEL@h
ori r7,r7,MSR_KERNEL@l
mtspr SPRN_SRR0,r6
@ -1583,9 +1586,11 @@ _GLOBAL(book3e_secondary_thread_init)
mflr r28
b 3b
.globl init_core_book3e
init_core_book3e:
/* Establish the interrupt vector base */
LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
tovirt(r2,r2)
LOAD_REG_ADDR(r3, interrupt_base_book3e)
mtspr SPRN_IVPR,r3
sync
blr

22
arch/powerpc/kernel/head_64.S
View File

@ -457,12 +457,22 @@ __after_prom_start:
/* process relocations for the final address of the kernel */
lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */
sldi r25,r25,32
#if defined(CONFIG_PPC_BOOK3E)
tovirt(r26,r26) /* on booke, we already run at PAGE_OFFSET */
#endif
lwz r7,__run_at_load-_stext(r26)
#if defined(CONFIG_PPC_BOOK3E)
tophys(r26,r26)
#endif
cmplwi cr0,r7,1 /* flagged to stay where we are ? */
bne 1f
add r25,r25,r26
1: mr r3,r25
bl relocate
#if defined(CONFIG_PPC_BOOK3E)
/* IVPR needs to be set after relocation. */
bl init_core_book3e
#endif
#endif
/*
@ -490,12 +500,21 @@ __after_prom_start:
* variable __run_at_load, if it is set the kernel is treated as relocatable
* kernel, otherwise it will be moved to PHYSICAL_START
*/
#if defined(CONFIG_PPC_BOOK3E)
tovirt(r26,r26) /* on booke, we already run at PAGE_OFFSET */
#endif
lwz r7,__run_at_load-_stext(r26)
cmplwi cr0,r7,1
bne 3f
#ifdef CONFIG_PPC_BOOK3E
LOAD_REG_ADDR(r5, __end_interrupts)
LOAD_REG_ADDR(r11, _stext)
sub r5,r5,r11
#else
/* just copy interrupts */
LOAD_REG_IMMEDIATE(r5, __end_interrupts - _stext)
#endif
b 5f
3:
#endif
@ -514,9 +533,6 @@ __after_prom_start:
p_end: .llong _end - _stext
4: /* Now copy the rest of the kernel up to _end */
#if defined(CONFIG_PPC_BOOK3E)
tovirt(r26,r26)
#endif
addis r5,r26,(p_end - _stext)@ha
ld r5,(p_end - _stext)@l(r5) /* get _end */
5: bl copy_and_flush /* copy the rest */