mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
3f9eaf0984
This patch adds a secure API to read AuxCoreBoot0 register to check the cpu boot status. It also moves the other smc APIs to common omap44xx-smc.S. This APIs should not be marked as __INIT because we need these to be present for CPU hotplug Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
50 lines
1.3 KiB
ArmAsm
50 lines
1.3 KiB
ArmAsm
/*
|
|
* Secondary CPU startup routine source file.
|
|
*
|
|
* Copyright (C) 2009 Texas Instruments, Inc.
|
|
*
|
|
* Author:
|
|
* Santosh Shilimkar <santosh.shilimkar@ti.com>
|
|
*
|
|
* Interface functions needed for the SMP. This file is based on arm
|
|
* realview smp platform.
|
|
* Copyright (c) 2003 ARM Limited.
|
|
*
|
|
* This program is free software,you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
|
|
/* Physical address needed since MMU not enabled yet on secondary core */
|
|
#define OMAP4_AUX_CORE_BOOT1_PA 0x48281804
|
|
|
|
__INIT
|
|
|
|
/*
|
|
* OMAP4 specific entry point for secondary CPU to jump from ROM
|
|
* code. This routine also provides a holding flag into which
|
|
* secondary core is held until we're ready for it to initialise.
|
|
* The primary core will update this flag using a hardware
|
|
* register AuxCoreBoot0.
|
|
*/
|
|
ENTRY(omap_secondary_startup)
|
|
hold: ldr r12,=0x103
|
|
dsb
|
|
smc #0 @ read from AuxCoreBoot0
|
|
mov r0, r0, lsr #9
|
|
mrc p15, 0, r4, c0, c0, 5
|
|
and r4, r4, #0x0f
|
|
cmp r0, r4
|
|
bne hold
|
|
|
|
/*
|
|
* we've been released from the wait loop,secondary_stack
|
|
* should now contain the SVC stack for this core
|
|
*/
|
|
b secondary_startup
|
|
END(omap_secondary_startup)
|
|
|