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