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powerpc/fsl_booke: introduce get_phys_addr function 

Move the codes which translate a effective address to physical address
to a separate function. So it can be reused by other code.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Kevin Hao 2013-12-24 15:12:04 +08:00 committed by Scott Wood
parent 7c732cba3d
commit 99739611e8
1 changed files with 30 additions and 20 deletions
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50
arch/powerpc/kernel/head_fsl_booke.S
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@ -65,26 +65,9 @@ _ENTRY(_start);
nop
/* Translate device tree address to physical, save in r30/r31 */
mfmsr r16
mfspr r17,SPRN_PID
rlwinm r17,r17,16,0x3fff0000 /* turn PID into MAS6[SPID] */
rlwimi r17,r16,28,0x00000001 /* turn MSR[DS] into MAS6[SAS] */
mtspr SPRN_MAS6,r17
tlbsx 0,r3 /* must succeed */
mfspr r16,SPRN_MAS1
mfspr r20,SPRN_MAS3
rlwinm r17,r16,25,0x1f /* r17 = log2(page size) */
li r18,1024
slw r18,r18,r17 /* r18 = page size */
addi r18,r18,-1
and r19,r3,r18 /* r19 = page offset */
andc r31,r20,r18 /* r31 = page base */
or r31,r31,r19 /* r31 = devtree phys addr */
#ifdef CONFIG_PHYS_64BIT
mfspr r30,SPRN_MAS7
#endif
bl get_phys_addr
mr r30,r3
mr r31,r4
li r25,0 /* phys kernel start (low) */
li r24,0 /* CPU number */
@ -857,6 +840,33 @@ KernelSPE:
#endif /* CONFIG_SPE */
/*
* Translate the effec addr in r3 to phys addr. The phys addr will be put
* into r3(higher 32bit) and r4(lower 32bit)
*/
get_phys_addr:
mfmsr r8
mfspr r9,SPRN_PID
rlwinm r9,r9,16,0x3fff0000 /* turn PID into MAS6[SPID] */
rlwimi r9,r8,28,0x00000001 /* turn MSR[DS] into MAS6[SAS] */
mtspr SPRN_MAS6,r9
tlbsx 0,r3 /* must succeed */
mfspr r8,SPRN_MAS1
mfspr r12,SPRN_MAS3
rlwinm r9,r8,25,0x1f /* r9 = log2(page size) */
li r10,1024
slw r10,r10,r9 /* r10 = page size */
addi r10,r10,-1
and r11,r3,r10 /* r11 = page offset */
andc r4,r12,r10 /* r4 = page base */
or r4,r4,r11 /* r4 = devtree phys addr */
#ifdef CONFIG_PHYS_64BIT
mfspr r3,SPRN_MAS7
#endif
blr
/*
* Global functions
*/