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arm64: remove __switch_data object from head.S 

This removes the confusing __switch_data object from head.S,
and replaces it with standard PC-relative references to the
various symbols it encapsulates.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Ard Biesheuvel 2015-03-04 11:51:48 +01:00 committed by Will Deacon
parent a44ef51799
commit a871d354f7
1 changed files with 8 additions and 21 deletions
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29
arch/arm64/kernel/head.S
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@ -253,7 +253,7 @@ ENTRY(stext)
* On return, the CPU will be ready for the MMU to be turned on and
* the TCR will have been set.
*/
ldr x27, __switch_data // address to jump to after
ldr x27, =__mmap_switched // address to jump to after
// MMU has been enabled
adrp lr, __enable_mmu // return (PIC) address
add lr, lr, #:lo12:__enable_mmu
@ -420,35 +420,22 @@ __create_page_tables:
ENDPROC(__create_page_tables)
.ltorg
.align 3
.type __switch_data, %object
__switch_data:
.quad __mmap_switched
.quad __bss_start // x6
.quad __bss_stop // x7
.quad __fdt_pointer // x5
.quad memstart_addr // x6
.quad init_thread_union + THREAD_START_SP // sp
/*
* The following fragment of code is executed with the MMU on in MMU mode, and
* uses absolute addresses; this is not position independent.
* The following fragment of code is executed with the MMU enabled.
*/
.set initial_sp, init_thread_union + THREAD_START_SP
__mmap_switched:
adr x3, __switch_data + 8
adr_l x6, __bss_start
adr_l x7, __bss_stop
ldp x6, x7, [x3], #16
1: cmp x6, x7
b.hs 2f
str xzr, [x6], #8 // Clear BSS
b 1b
2:
ldr x5, [x3], #8
ldr x6, [x3], #8
ldr x16, [x3]
mov sp, x16
str x21, [x5] // Save FDT pointer
str x24, [x6] // Save PHYS_OFFSET
adr_l sp, initial_sp, x4
str_l x21, __fdt_pointer, x5 // Save FDT pointer
str_l x24, memstart_addr, x6 // Save PHYS_OFFSET
mov x29, #0
b start_kernel
ENDPROC(__mmap_switched)