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ARM: add register documentation for __enable_mmu

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Add some additional documentation on register usage in __enable_mmu
to help complete the overall picture.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2010-10-04 18:02:59 +01:00
parent 00945010c0
commit 865a4fae77
1 changed files with 10 additions and 0 deletions
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10
arch/arm/kernel/head.S
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@@ -303,6 +303,13 @@ __secondary_data:
* Setup common bits before finally enabling the MMU. Essentially * Setup common bits before finally enabling the MMU. Essentially
* this is just loading the page table pointer and domain access * this is just loading the page table pointer and domain access
* registers. * registers.
*
* r0 = cp#15 control register
* r1 = machine ID
* r2 = atags pointer
* r4 = page table pointer
* r9 = processor ID
* r13 = *virtual* address to jump to upon completion
*/ */
__enable_mmu: __enable_mmu:
#ifdef CONFIG_ALIGNMENT_TRAP #ifdef CONFIG_ALIGNMENT_TRAP
@@ -335,6 +342,9 @@ ENDPROC(__enable_mmu)
* mailing list archives BEFORE sending another post to the list. * mailing list archives BEFORE sending another post to the list.
* *
* r0 = cp#15 control register * r0 = cp#15 control register
* r1 = machine ID
* r2 = atags pointer
* r9 = processor ID
* r13 = *virtual* address to jump to upon completion * r13 = *virtual* address to jump to upon completion
* *
* other registers depend on the function called upon completion * other registers depend on the function called upon completion