diff options
| author | Scott Wood <scottwood@freescale.com> | 2011-07-25 11:29:33 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-09-20 09:19:47 +1000 |
| commit | 6dece0eb69b2a28e18d104bc5d707f1cb673f5e0 (patch) | |
| tree | a5f3fcffc289d71cb31152e7d07f14da49607643 /arch/powerpc/kernel/head_44x.S | |
| parent | 6c493685f1b209dd4ae41eb52c818cf12da20def (diff) | |
powerpc/32: Pass device tree address as u64 to machine_init
u64 is used rather than phys_addr_t to keep things simple, as
this is called from assembly code.
Update callers to pass a 64-bit address in r3/r4. Other unused
register assignments that were once parameters to machine_init
are dropped.
For FSL BookE, look up the physical address of the device tree from the
effective address passed in r3 by the loader. This is required for
situations where memory does not start at zero (due to AMP or IOMMU-less
virtualization), and thus the IMA doesn't start at zero, and thus the
device tree effective address does not equal the physical address.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/head_44x.S')
| -rw-r--r-- | arch/powerpc/kernel/head_44x.S | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S index f8e971ba94f5..b725dab0f88a 100644 --- a/arch/powerpc/kernel/head_44x.S +++ b/arch/powerpc/kernel/head_44x.S @@ -61,14 +61,7 @@ _ENTRY(_start); * of abatron_pteptrs */ nop -/* - * Save parameters we are passed - */ - mr r31,r3 - mr r30,r4 - mr r29,r5 - mr r28,r6 - mr r27,r7 + mr r31,r3 /* save device tree ptr */ li r24,0 /* CPU number */ bl init_cpu_state @@ -120,11 +113,8 @@ _ENTRY(_start); /* * Decide what sort of machine this is and initialize the MMU. */ - mr r3,r31 - mr r4,r30 - mr r5,r29 - mr r6,r28 - mr r7,r27 + li r3,0 + mr r4,r31 bl machine_init bl MMU_init |