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| author | Kevin Hao <haokexin@gmail.com> | 2013-12-24 15:12:11 +0800 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-01-09 17:52:18 -0600 |
| commit | 0be7d969b0efef085ed6497d462ba16a875ca737 (patch) | |
| tree | c2cf4e6760102757785a0d91fcb052372153e9c7 /arch/powerpc/kernel | |
| parent | 7d2471f9fa85089beb1cb9436ffc28f9e11e518d (diff) | |
| download | linux-0be7d969b0efef085ed6497d462ba16a875ca737.tar.gz linux-0be7d969b0efef085ed6497d462ba16a875ca737.tar.bz2 linux-0be7d969b0efef085ed6497d462ba16a875ca737.zip | |
powerpc/fsl_booke: smp support for booting a relocatable kernel above 64M
When booting above the 64M for a secondary cpu, we also face the
same issue as the boot cpu that the PAGE_OFFSET map two different
physical address for the init tlb and the final map. So we have to use
switch_to_as1/restore_to_as0 between the conversion of these two
maps. When restoring to as0 for a secondary cpu, we only need to
return to the caller. So add a new parameter for function
restore_to_as0 for this purpose.
Use LOAD_REG_ADDR_PIC to get the address of variables which may
be used before we set the final map in cams for the secondary cpu.
Move the setting of cams a bit earlier in order to avoid the
unnecessary using of LOAD_REG_ADDR_PIC.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/head_fsl_booke.S | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index b1f7edc3c360..b497188a94a1 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -216,8 +216,7 @@ set_ivor: /* Check to see if we're the second processor, and jump * to the secondary_start code if so */ - lis r24, boot_cpuid@h - ori r24, r24, boot_cpuid@l + LOAD_REG_ADDR_PIC(r24, boot_cpuid) lwz r24, 0(r24) cmpwi r24, -1 mfspr r24,SPRN_PIR @@ -1146,24 +1145,36 @@ _GLOBAL(__flush_disable_L1) /* When we get here, r24 needs to hold the CPU # */ .globl __secondary_start __secondary_start: - lis r3,__secondary_hold_acknowledge@h - ori r3,r3,__secondary_hold_acknowledge@l - stw r24,0(r3) - - li r3,0 - mr r4,r24 /* Why? */ - bl call_setup_cpu - - lis r3,tlbcam_index@ha - lwz r3,tlbcam_index@l(r3) + LOAD_REG_ADDR_PIC(r3, tlbcam_index) + lwz r3,0(r3) mtctr r3 li r26,0 /* r26 safe? */ + bl switch_to_as1 + mr r27,r3 /* tlb entry */ /* Load each CAM entry */ 1: mr r3,r26 bl loadcam_entry addi r26,r26,1 bdnz 1b + mr r3,r27 /* tlb entry */ + LOAD_REG_ADDR_PIC(r4, memstart_addr) + lwz r4,0(r4) + mr r5,r25 /* phys kernel start */ + rlwinm r5,r5,0,~0x3ffffff /* aligned 64M */ + subf r4,r5,r4 /* memstart_addr - phys kernel start */ + li r5,0 /* no device tree */ + li r6,0 /* not boot cpu */ + bl restore_to_as0 + + + lis r3,__secondary_hold_acknowledge@h + ori r3,r3,__secondary_hold_acknowledge@l + stw r24,0(r3) + + li r3,0 + mr r4,r24 /* Why? */ + bl call_setup_cpu /* get current_thread_info and current */ lis r1,secondary_ti@ha @@ -1253,6 +1264,7 @@ _GLOBAL(switch_to_as1) * r3 - the tlb entry which should be invalidated * r4 - __pa(PAGE_OFFSET in AS1) - __pa(PAGE_OFFSET in AS0) * r5 - device tree virtual address. If r4 is 0, r5 is ignored. + * r6 - boot cpu */ _GLOBAL(restore_to_as0) mflr r0 @@ -1268,6 +1280,7 @@ _GLOBAL(restore_to_as0) */ add r9,r9,r4 add r5,r5,r4 + add r0,r0,r4 2: mfmsr r7 li r8,(MSR_IS | MSR_DS) @@ -1290,7 +1303,9 @@ _GLOBAL(restore_to_as0) isync cmpwi r4,0 - bne 3f + cmpwi cr1,r6,0 + cror eq,4*cr1+eq,eq + bne 3f /* offset != 0 && is_boot_cpu */ mtlr r0 blr |