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/**
* Copyright (c) 2011 Trusted Logic S.A.
* All Rights Reserved.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
.text
#define SMICODEPUB_IRQ_END 0xFE
#define SMICODEPUB_FIQ_END 0xFD
#define SMICODEPUB_RPC_END 0xFC
#define PUB2SEC_NOCST 0xFF
#define SMICODEPUB_NEWTASK 0x00
/*
* RPC status:
* - 0: the secure world yielded due to an interrupt
* - 1: the secure world yielded on an RPC (no public thread is handling it)
* - 2: the secure world yielded on an RPC and the response is ready
*/
#define RPC_ADVANCEMENT_NONE 0
#define RPC_ADVANCEMENT_PENDING 1
#define RPC_ADVANCEMENT_FINISHED 2
#ifdef CONFIG_ARM_ERRATA_430973
#define INVALIDATE_BTB MCR p15, 0, R0, c7, c5, 6
#else
#define INVALIDATE_BTB
#endif
schedule_secure_world:
.global schedule_secure_world
/* Save registers */
push {r4-r12, lr}
/* Copy the Secure Service ID in r12 */
mov r12, r0
cmp r0, #SMICODEPUB_IRQ_END
beq return_from_irq
cmp r0, #SMICODEPUB_RPC_END
beq return_from_rpc
mov r6, #PUB2SEC_NOCST
mov r12, #SMICODEPUB_NEWTASK
b label_smc
return_from_rpc:
ldr r9, =g_RPC_parameters
ldm r9, {r0-r3}
/* fall through... */
return_from_irq:
ldr r10, =g_secure_task_id
ldr r6, [r10]
b label_smc
label_smc:
INVALIDATE_BTB
dsb
dmb
smc #0
b service_end
nop
INVALIDATE_BTB
ldr r8, =g_secure_task_id
str r6, [r8]
mov r0, #0x00
ldr r8, =g_service_end
str r0, [r8]
service_end:
INVALIDATE_BTB
/* Restore registers */
pop {r4-r12, pc}
rpc_handler:
.global rpc_handler
INVALIDATE_BTB
/* g_RPC_advancement = RPC_ADVANCEMENT_PENDING */
ldr r8, =g_RPC_advancement
mov r9, #RPC_ADVANCEMENT_PENDING
str r9, [r8]
ldr r8, =g_RPC_parameters
stm r8, {r0-r3}
ldr r8, =g_secure_task_id
str r6, [r8]
mov r0, #0x00
ldr r8, =g_service_end
str r0, [r8]
/* Restore registers */
pop {r4-r12, pc}
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