mirror of
https://github.com/espressif/esp-idf.git
synced 2024-09-21 06:56:11 -04:00
4846222102
The following changes have been made: 1. All FreeRTOS kernel source files are now placed in the freertos/FreeRTOS-Kernel folder to match with the upstream folder structure. 2. All kernel include files are now placed in freertos/FreeRTOS-Kernel/include. 3. All port files are now placed in freertos/FreeRTOS-Kernel/portable. 4. All additions/customizations are placed in freertos/esp_additions. 5. All other miscellaneous files (README, License files etc.) are moved to freertos/FreeRTOS-Kernel folder to match with the upstream. 6. Updated esp-cryptoauthlib to latest commit to resolve FreeRTOS include dependencies. Signed-off-by: Sudeep Mohanty <sudeep.mohanty@espressif.com>
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*
|
|
* Copyright (c) 2017, Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/*
|
|
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/* File adapted to use on IDF FreeRTOS component, extracted
|
|
* originally from zephyr RTOS code base:
|
|
* https://github.com/zephyrproject-rtos/zephyr/blob/dafd348/arch/xtensa/include/xtensa-asm2-s.h
|
|
*/
|
|
|
|
#ifndef __XT_ASM_UTILS_H
|
|
#define __XT_ASM_UTILS_H
|
|
|
|
/*
|
|
* SPILL_ALL_WINDOWS
|
|
*
|
|
* Spills all windowed registers (i.e. registers not visible as
|
|
* A0-A15) to their ABI-defined spill regions on the stack.
|
|
*
|
|
* Unlike the Xtensa HAL implementation, this code requires that the
|
|
* EXCM and WOE bit be enabled in PS, and relies on repeated hardware
|
|
* exception handling to do the register spills. The trick is to do a
|
|
* noop write to the high registers, which the hardware will trap
|
|
* (into an overflow exception) in the case where those registers are
|
|
* already used by an existing call frame. Then it rotates the window
|
|
* and repeats until all but the A0-A3 registers of the original frame
|
|
* are guaranteed to be spilled, eventually rotating back around into
|
|
* the original frame. Advantages:
|
|
*
|
|
* - Vastly smaller code size
|
|
*
|
|
* - More easily maintained if changes are needed to window over/underflow
|
|
* exception handling.
|
|
*
|
|
* - Requires no scratch registers to do its work, so can be used safely in any
|
|
* context.
|
|
*
|
|
* - If the WOE bit is not enabled (for example, in code written for
|
|
* the CALL0 ABI), this becomes a silent noop and operates compatbily.
|
|
*
|
|
* - Hilariously it's ACTUALLY FASTER than the HAL routine. And not
|
|
* just a little bit, it's MUCH faster. With a mostly full register
|
|
* file on an LX6 core (ESP-32) I'm measuring 145 cycles to spill
|
|
* registers with this vs. 279 (!) to do it with
|
|
* xthal_spill_windows().
|
|
*/
|
|
|
|
.macro SPILL_ALL_WINDOWS
|
|
#if XCHAL_NUM_AREGS == 64
|
|
and a12, a12, a12
|
|
rotw 3
|
|
and a12, a12, a12
|
|
rotw 3
|
|
and a12, a12, a12
|
|
rotw 3
|
|
and a12, a12, a12
|
|
rotw 3
|
|
and a12, a12, a12
|
|
rotw 4
|
|
#elif XCHAL_NUM_AREGS == 32
|
|
and a12, a12, a12
|
|
rotw 3
|
|
and a12, a12, a12
|
|
rotw 3
|
|
and a4, a4, a4
|
|
rotw 2
|
|
#else
|
|
#error Unrecognized XCHAL_NUM_AREGS
|
|
#endif
|
|
.endm
|
|
|
|
#endif
|