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/** @file
*
* Copyright (c) 2014, ARM Limited. All rights reserved.
*
* This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License
* which accompanies this distribution. The full text of the license may be found at
* http://opensource.org/licenses/bsd-license.php
*
* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
*
**/
#ifndef __SUSPEND_PRIV_H__
#define __SUSPEND_PRIV_H__
#define CPU_SUSPEND_SZ 64
#define CPU_CTX_SP 48
#ifndef __ASSEMBLY__
#include <cassert.h>
#include <stdint.h>
#include <string.h>
#define NR_CTX_REGS 6
/*
* struct tftf_cpu_suspend_ctx represents the architecture context to
* be saved and restored while entering suspend and coming out.
* It must be 16-byte aligned since it is allocated on the stack, which must be
* 16-byte aligned on ARMv8
*/
typedef struct tftf_cpu_suspend_context {
uint64_t arch_ctx_regs[NR_CTX_REGS];
uint64_t stack_pointer;
} __aligned(16) tftf_cpu_suspend_ctx_t;
/*
* Saves callee save registers on the stack
* Allocate space on stack for CPU context regs
* Enters suspend by calling tftf_enter_suspend.
* power state: PSCI power state to be sent via SMC
* Returns: PSCI_E_SUCCESS or PSCI_E_INVALID_PARAMS
*/
unsigned int __tftf_cpu_suspend(uint32_t power_state);
/*
* Saves the architecture context of CPU in the memory
* tftf_cpu_suspend_context: Pointer to the location for saving the context
*/
void __tftf_save_arch_context(struct tftf_cpu_suspend_context *ctx);
/*
* Calls __tftf_save_arch_context to saves arch context of cpu to the memory
* pointed by ctx
* Enters suspend by calling the SMC
* power state: PSCI power state to be sent via SMC
* ptr: Pointer to the location where CPU context can be stored
* Returns: PSCI_E_SUCCESS or PSCI_E_INVALID_PARAMS
*/
unsigned int __tftf_enter_suspend(uint32_t power_state,
tftf_cpu_suspend_ctx_t *ctx);
/*
* Restores the CPU arch context and callee registers from the location pointed
* by X0(context ID).
* Returns: PSCI_E_SUCCESS
*/
unsigned int __tftf_cpu_resume_ep(void);
/* Assembler asserts to verify #defines of offsets match as seen by compiler */
CASSERT(CPU_SUSPEND_SZ == sizeof(tftf_cpu_suspend_ctx_t),
assert_cpu_context_size_mismatch);
CASSERT(CPU_CTX_SP == __builtin_offsetof(tftf_cpu_suspend_ctx_t, stack_pointer),
assert_stack_pointer_location_mismatch_in_suspend_cxt);
#endif /* __ASSEMBLY__ */
#endif /* __SUSPEND_PRIV_H__ */
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