mirror of https://gitee.com/openkylin/linux.git
100 lines
2.6 KiB
ArmAsm
100 lines
2.6 KiB
ArmAsm
/*
|
|
* Copyright 2011 Freescale Semiconductor, Inc.
|
|
* Copyright 2011 Linaro Ltd.
|
|
*
|
|
* The code contained herein is licensed under the GNU General Public
|
|
* License. You may obtain a copy of the GNU General Public License
|
|
* Version 2 or later at the following locations:
|
|
*
|
|
* http://www.opensource.org/licenses/gpl-license.html
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/hardware/cache-l2x0.h>
|
|
|
|
.section ".text.head", "ax"
|
|
__CPUINIT
|
|
|
|
/*
|
|
* The secondary kernel init calls v7_flush_dcache_all before it enables
|
|
* the L1; however, the L1 comes out of reset in an undefined state, so
|
|
* the clean + invalidate performed by v7_flush_dcache_all causes a bunch
|
|
* of cache lines with uninitialized data and uninitialized tags to get
|
|
* written out to memory, which does really unpleasant things to the main
|
|
* processor. We fix this by performing an invalidate, rather than a
|
|
* clean + invalidate, before jumping into the kernel.
|
|
*
|
|
* This funciton is cloned from arch/arm/mach-tegra/headsmp.S, and needs
|
|
* to be called for both secondary cores startup and primary core resume
|
|
* procedures. Ideally, it should be moved into arch/arm/mm/cache-v7.S.
|
|
*/
|
|
ENTRY(v7_invalidate_l1)
|
|
mov r0, #0
|
|
mcr p15, 2, r0, c0, c0, 0
|
|
mrc p15, 1, r0, c0, c0, 0
|
|
|
|
ldr r1, =0x7fff
|
|
and r2, r1, r0, lsr #13
|
|
|
|
ldr r1, =0x3ff
|
|
|
|
and r3, r1, r0, lsr #3 @ NumWays - 1
|
|
add r2, r2, #1 @ NumSets
|
|
|
|
and r0, r0, #0x7
|
|
add r0, r0, #4 @ SetShift
|
|
|
|
clz r1, r3 @ WayShift
|
|
add r4, r3, #1 @ NumWays
|
|
1: sub r2, r2, #1 @ NumSets--
|
|
mov r3, r4 @ Temp = NumWays
|
|
2: subs r3, r3, #1 @ Temp--
|
|
mov r5, r3, lsl r1
|
|
mov r6, r2, lsl r0
|
|
orr r5, r5, r6 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
|
|
mcr p15, 0, r5, c7, c6, 2
|
|
bgt 2b
|
|
cmp r2, #0
|
|
bgt 1b
|
|
dsb
|
|
isb
|
|
mov pc, lr
|
|
ENDPROC(v7_invalidate_l1)
|
|
|
|
#ifdef CONFIG_SMP
|
|
ENTRY(v7_secondary_startup)
|
|
bl v7_invalidate_l1
|
|
b secondary_startup
|
|
ENDPROC(v7_secondary_startup)
|
|
#endif
|
|
|
|
/*
|
|
* The following code is located into the .data section. This is to
|
|
* allow phys_l2x0_saved_regs to be accessed with a relative load
|
|
* as we are running on physical address here.
|
|
*/
|
|
.data
|
|
.align
|
|
|
|
.macro pl310_resume
|
|
ldr r2, phys_l2x0_saved_regs
|
|
ldr r0, [r2, #L2X0_R_PHY_BASE] @ get physical base of l2x0
|
|
ldr r1, [r2, #L2X0_R_AUX_CTRL] @ get aux_ctrl value
|
|
str r1, [r0, #L2X0_AUX_CTRL] @ restore aux_ctrl
|
|
mov r1, #0x1
|
|
str r1, [r0, #L2X0_CTRL] @ re-enable L2
|
|
.endm
|
|
|
|
ENTRY(v7_cpu_resume)
|
|
bl v7_invalidate_l1
|
|
pl310_resume
|
|
b cpu_resume
|
|
ENDPROC(v7_cpu_resume)
|
|
|
|
.globl phys_l2x0_saved_regs
|
|
phys_l2x0_saved_regs:
|
|
.long 0
|