From 6dece0eb69b2a28e18d104bc5d707f1cb673f5e0 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Mon, 25 Jul 2011 11:29:33 +0000 Subject: 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/head_44x.S | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) (limited to 'arch/powerpc/kernel/head_44x.S') diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S index f8e971ba94f..b725dab0f88 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 -- cgit v1.2.3