提交 6dece0eb 编写于 作者: S Scott Wood 提交者: Benjamin Herrenschmidt

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: NScott Wood <scottwood@freescale.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
上级 6c493685
......@@ -139,8 +139,7 @@ __start:
trap
#endif /* CONFIG_PPC_PMAC */
1: mr r31,r3 /* save parameters */
mr r30,r4
1: mr r31,r3 /* save device tree ptr */
li r24,0 /* cpu # */
/*
......@@ -964,8 +963,8 @@ start_here:
* Do early platform-specific initialization,
* and set up the MMU.
*/
mr r3,r31
mr r4,r30
li r3,0
mr r4,r31
bl machine_init
bl __save_cpu_setup
bl MMU_init
......
......@@ -58,13 +58,7 @@
_ENTRY(_stext);
_ENTRY(_start);
/* 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 */
/* We have to turn on the MMU right away so we get cache modes
* set correctly.
......@@ -849,11 +843,8 @@ start_here:
/*
* 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
......
......@@ -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
......
......@@ -76,11 +76,7 @@ _ENTRY(_start);
*/
.globl __start
__start:
mr r31,r3 /* save parameters */
mr r30,r4
mr r29,r5
mr r28,r6
mr r27,r7
mr r31,r3 /* save device tree ptr */
/* We have to turn on the MMU right away so we get cache modes
* set correctly.
......@@ -723,11 +719,8 @@ start_here:
/*
* 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
......
......@@ -63,14 +63,27 @@ _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
/* 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 /* r3 = page base */
or r31,r31,r19 /* r3 = devtree phys addr */
mfspr r30,SPRN_MAS7
li r25,0 /* phys kernel start (low) */
li r24,0 /* CPU number */
li r23,0 /* phys kernel start (high) */
......@@ -198,11 +211,8 @@ _ENTRY(__early_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
mr r3,r30
mr r4,r31
bl machine_init
bl MMU_init
......
......@@ -117,7 +117,7 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
* This is called very early on the boot process, after a minimal
* MMU environment has been set up but before MMU_init is called.
*/
notrace void __init machine_init(unsigned long dt_ptr)
notrace void __init machine_init(u64 dt_ptr)
{
lockdep_init();
......
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