From 6ab94e0b318884bbcb95e2ea3835f951502e1d99 Mon Sep 17 00:00:00 2001 From: jaseg Date: Wed, 14 Oct 2020 12:47:28 +0200 Subject: Move firmware into subdirectory --- .../Drivers/CMSIS/Core_A/Include/cmsis_gcc.h | 679 +++++++++++++++++++++ 1 file changed, 679 insertions(+) create mode 100644 fw/midi-dials/Drivers/CMSIS/Core_A/Include/cmsis_gcc.h (limited to 'fw/midi-dials/Drivers/CMSIS/Core_A/Include/cmsis_gcc.h') diff --git a/fw/midi-dials/Drivers/CMSIS/Core_A/Include/cmsis_gcc.h b/fw/midi-dials/Drivers/CMSIS/Core_A/Include/cmsis_gcc.h new file mode 100644 index 0000000..fb1442c --- /dev/null +++ b/fw/midi-dials/Drivers/CMSIS/Core_A/Include/cmsis_gcc.h @@ -0,0 +1,679 @@ +/**************************************************************************//** + * @file cmsis_gcc.h + * @brief CMSIS compiler specific macros, functions, instructions + * @version V1.0.2 + * @date 09. April 2018 + ******************************************************************************/ +/* + * Copyright (c) 2009-2018 Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the License); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef __CMSIS_GCC_H +#define __CMSIS_GCC_H + +/* ignore some GCC warnings */ +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wsign-conversion" +#pragma GCC diagnostic ignored "-Wconversion" +#pragma GCC diagnostic ignored "-Wunused-parameter" + +/* Fallback for __has_builtin */ +#ifndef __has_builtin + #define __has_builtin(x) (0) +#endif + +/* CMSIS compiler specific defines */ +#ifndef __ASM + #define __ASM asm +#endif +#ifndef __INLINE + #define __INLINE inline +#endif +#ifndef __FORCEINLINE + #define __FORCEINLINE __attribute__((always_inline)) +#endif +#ifndef __STATIC_INLINE + #define __STATIC_INLINE static inline +#endif +#ifndef __STATIC_FORCEINLINE + #define __STATIC_FORCEINLINE __attribute__((always_inline)) static inline +#endif +#ifndef __NO_RETURN + #define __NO_RETURN __attribute__((__noreturn__)) +#endif +#ifndef CMSIS_DEPRECATED + #define CMSIS_DEPRECATED __attribute__((deprecated)) +#endif +#ifndef __USED + #define __USED __attribute__((used)) +#endif +#ifndef __WEAK + #define __WEAK __attribute__((weak)) +#endif +#ifndef __PACKED + #define __PACKED __attribute__((packed, aligned(1))) +#endif +#ifndef __PACKED_STRUCT + #define __PACKED_STRUCT struct __attribute__((packed, aligned(1))) +#endif +#ifndef __UNALIGNED_UINT16_WRITE + #pragma GCC diagnostic push + #pragma GCC diagnostic ignored "-Wpacked" +/*lint -esym(9058, T_UINT16_WRITE)*/ /* disable MISRA 2012 Rule 2.4 for T_UINT16_WRITE */ + __PACKED_STRUCT T_UINT16_WRITE { uint16_t v; }; + #pragma GCC diagnostic pop + #define __UNALIGNED_UINT16_WRITE(addr, val) (void)((((struct T_UINT16_WRITE *)(void *)(addr))->v) = (val)) +#endif +#ifndef __UNALIGNED_UINT16_READ + #pragma GCC diagnostic push + #pragma GCC diagnostic ignored "-Wpacked" +/*lint -esym(9058, T_UINT16_READ)*/ /* disable MISRA 2012 Rule 2.4 for T_UINT16_READ */ + __PACKED_STRUCT T_UINT16_READ { uint16_t v; }; + #pragma GCC diagnostic pop + #define __UNALIGNED_UINT16_READ(addr) (((const struct T_UINT16_READ *)(const void *)(addr))->v) +#endif +#ifndef __UNALIGNED_UINT32_WRITE + #pragma GCC diagnostic push + #pragma GCC diagnostic ignored "-Wpacked" +/*lint -esym(9058, T_UINT32_WRITE)*/ /* disable MISRA 2012 Rule 2.4 for T_UINT32_WRITE */ + __PACKED_STRUCT T_UINT32_WRITE { uint32_t v; }; + #pragma GCC diagnostic pop + #define __UNALIGNED_UINT32_WRITE(addr, val) (void)((((struct T_UINT32_WRITE *)(void *)(addr))->v) = (val)) +#endif +#ifndef __UNALIGNED_UINT32_READ + #pragma GCC diagnostic push + #pragma GCC diagnostic ignored "-Wpacked" + __PACKED_STRUCT T_UINT32_READ { uint32_t v; }; + #pragma GCC diagnostic pop + #define __UNALIGNED_UINT32_READ(addr) (((const struct T_UINT32_READ *)(const void *)(addr))->v) +#endif +#ifndef __ALIGNED + #define __ALIGNED(x) __attribute__((aligned(x))) +#endif + +/* ########################## Core Instruction Access ######################### */ +/** + \brief No Operation + */ +#define __NOP() __ASM volatile ("nop") + +/** + \brief Wait For Interrupt + */ +#define __WFI() __ASM volatile ("wfi") + +/** + \brief Wait For Event + */ +#define __WFE() __ASM volatile ("wfe") + +/** + \brief Send Event + */ +#define __SEV() __ASM volatile ("sev") + +/** + \brief Instruction Synchronization Barrier + \details Instruction Synchronization Barrier flushes the pipeline in the processor, + so that all instructions following the ISB are fetched from cache or memory, + after the instruction has been completed. + */ +__STATIC_FORCEINLINE void __ISB(void) +{ + __ASM volatile ("isb 0xF":::"memory"); +} + + +/** + \brief Data Synchronization Barrier + \details Acts as a special kind of Data Memory Barrier. + It completes when all explicit memory accesses before this instruction complete. + */ +__STATIC_FORCEINLINE void __DSB(void) +{ + __ASM volatile ("dsb 0xF":::"memory"); +} + +/** + \brief Data Memory Barrier + \details Ensures the apparent order of the explicit memory operations before + and after the instruction, without ensuring their completion. + */ +__STATIC_FORCEINLINE void __DMB(void) +{ + __ASM volatile ("dmb 0xF":::"memory"); +} + +/** + \brief Reverse byte order (32 bit) + \details Reverses the byte order in unsigned integer value. For example, 0x12345678 becomes 0x78563412. + \param [in] value Value to reverse + \return Reversed value + */ +__STATIC_FORCEINLINE uint32_t __REV(uint32_t value) +{ +#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) + return __builtin_bswap32(value); +#else + uint32_t result; + + __ASM volatile ("rev %0, %1" : __CMSIS_GCC_OUT_REG (result) : __CMSIS_GCC_USE_REG (value) ); + return result; +#endif +} + +/** + \brief Reverse byte order (16 bit) + \details Reverses the byte order within each halfword of a word. For example, 0x12345678 becomes 0x34127856. + \param [in] value Value to reverse + \return Reversed value + */ +#ifndef __NO_EMBEDDED_ASM +__attribute__((section(".rev16_text"))) __STATIC_INLINE uint32_t __REV16(uint32_t value) +{ + uint32_t result; + __ASM volatile("rev16 %0, %1" : "=r" (result) : "r" (value)); + return result; +} +#endif + +/** + \brief Reverse byte order (16 bit) + \details Reverses the byte order in a 16-bit value and returns the signed 16-bit result. For example, 0x0080 becomes 0x8000. + \param [in] value Value to reverse + \return Reversed value + */ +__STATIC_FORCEINLINE int16_t __REVSH(int16_t value) +{ +#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8) + return (int16_t)__builtin_bswap16(value); +#else + int16_t result; + + __ASM volatile ("revsh %0, %1" : __CMSIS_GCC_OUT_REG (result) : __CMSIS_GCC_USE_REG (value) ); + return result; +#endif +} + +/** + \brief Rotate Right in unsigned value (32 bit) + \details Rotate Right (immediate) provides the value of the contents of a register rotated by a variable number of bits. + \param [in] op1 Value to rotate + \param [in] op2 Number of Bits to rotate + \return Rotated value + */ +__STATIC_FORCEINLINE uint32_t __ROR(uint32_t op1, uint32_t op2) +{ + op2 %= 32U; + if (op2 == 0U) { + return op1; + } + return (op1 >> op2) | (op1 << (32U - op2)); +} + + +/** + \brief Breakpoint + \param [in] value is ignored by the processor. + If required, a debugger can use it to store additional information about the breakpoint. + */ +#define __BKPT(value) __ASM volatile ("bkpt "#value) + +/** + \brief Reverse bit order of value + \details Reverses the bit order of the given value. + \param [in] value Value to reverse + \return Reversed value + */ +__STATIC_FORCEINLINE uint32_t __RBIT(uint32_t value) +{ + uint32_t result; + +#if ((defined (__ARM_ARCH_7M__ ) && (__ARM_ARCH_7M__ == 1)) || \ + (defined (__ARM_ARCH_7EM__ ) && (__ARM_ARCH_7EM__ == 1)) || \ + (defined (__ARM_ARCH_8M_MAIN__ ) && (__ARM_ARCH_8M_MAIN__ == 1)) ) + __ASM volatile ("rbit %0, %1" : "=r" (result) : "r" (value) ); +#else + int32_t s = (4U /*sizeof(v)*/ * 8U) - 1U; /* extra shift needed at end */ + + result = value; /* r will be reversed bits of v; first get LSB of v */ + for (value >>= 1U; value; value >>= 1U) + { + result <<= 1U; + result |= value & 1U; + s--; + } + result <<= s; /* shift when v's highest bits are zero */ +#endif + return result; +} + +/** + \brief Count leading zeros + \param [in] value Value to count the leading zeros + \return number of leading zeros in value + */ +#define __CLZ (uint8_t)__builtin_clz + +/** + \brief LDR Exclusive (8 bit) + \details Executes a exclusive LDR instruction for 8 bit value. + \param [in] ptr Pointer to data + \return value of type uint8_t at (*ptr) + */ +__STATIC_FORCEINLINE uint8_t __LDREXB(volatile uint8_t *addr) +{ + uint32_t result; + +#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8) + __ASM volatile ("ldrexb %0, %1" : "=r" (result) : "Q" (*addr) ); +#else + /* Prior to GCC 4.8, "Q" will be expanded to [rx, #0] which is not + accepted by assembler. So has to use following less efficient pattern. + */ + __ASM volatile ("ldrexb %0, [%1]" : "=r" (result) : "r" (addr) : "memory" ); +#endif + return ((uint8_t) result); /* Add explicit type cast here */ +} + + +/** + \brief LDR Exclusive (16 bit) + \details Executes a exclusive LDR instruction for 16 bit values. + \param [in] ptr Pointer to data + \return value of type uint16_t at (*ptr) + */ +__STATIC_FORCEINLINE uint16_t __LDREXH(volatile uint16_t *addr) +{ + uint32_t result; + +#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8) + __ASM volatile ("ldrexh %0, %1" : "=r" (result) : "Q" (*addr) ); +#else + /* Prior to GCC 4.8, "Q" will be expanded to [rx, #0] which is not + accepted by assembler. So has to use following less efficient pattern. + */ + __ASM volatile ("ldrexh %0, [%1]" : "=r" (result) : "r" (addr) : "memory" ); +#endif + return ((uint16_t) result); /* Add explicit type cast here */ +} + + +/** + \brief LDR Exclusive (32 bit) + \details Executes a exclusive LDR instruction for 32 bit values. + \param [in] ptr Pointer to data + \return value of type uint32_t at (*ptr) + */ +__STATIC_FORCEINLINE uint32_t __LDREXW(volatile uint32_t *addr) +{ + uint32_t result; + + __ASM volatile ("ldrex %0, %1" : "=r" (result) : "Q" (*addr) ); + return(result); +} + + +/** + \brief STR Exclusive (8 bit) + \details Executes a exclusive STR instruction for 8 bit values. + \param [in] value Value to store + \param [in] ptr Pointer to location + \return 0 Function succeeded + \return 1 Function failed + */ +__STATIC_FORCEINLINE uint32_t __STREXB(uint8_t value, volatile uint8_t *addr) +{ + uint32_t result; + + __ASM volatile ("strexb %0, %2, %1" : "=&r" (result), "=Q" (*addr) : "r" ((uint32_t)value) ); + return(result); +} + + +/** + \brief STR Exclusive (16 bit) + \details Executes a exclusive STR instruction for 16 bit values. + \param [in] value Value to store + \param [in] ptr Pointer to location + \return 0 Function succeeded + \return 1 Function failed + */ +__STATIC_FORCEINLINE uint32_t __STREXH(uint16_t value, volatile uint16_t *addr) +{ + uint32_t result; + + __ASM volatile ("strexh %0, %2, %1" : "=&r" (result), "=Q" (*addr) : "r" ((uint32_t)value) ); + return(result); +} + + +/** + \brief STR Exclusive (32 bit) + \details Executes a exclusive STR instruction for 32 bit values. + \param [in] value Value to store + \param [in] ptr Pointer to location + \return 0 Function succeeded + \return 1 Function failed + */ +__STATIC_FORCEINLINE uint32_t __STREXW(uint32_t value, volatile uint32_t *addr) +{ + uint32_t result; + + __ASM volatile ("strex %0, %2, %1" : "=&r" (result), "=Q" (*addr) : "r" (value) ); + return(result); +} + + +/** + \brief Remove the exclusive lock + \details Removes the exclusive lock which is created by LDREX. + */ +__STATIC_FORCEINLINE void __CLREX(void) +{ + __ASM volatile ("clrex" ::: "memory"); +} + +/** + \brief Signed Saturate + \details Saturates a signed value. + \param [in] value Value to be saturated + \param [in] sat Bit position to saturate to (1..32) + \return Saturated value + */ +#define __SSAT(ARG1,ARG2) \ +__extension__ \ +({ \ + int32_t __RES, __ARG1 = (ARG1); \ + __ASM ("ssat %0, %1, %2" : "=r" (__RES) : "I" (ARG2), "r" (__ARG1) ); \ + __RES; \ + }) + + +/** + \brief Unsigned Saturate + \details Saturates an unsigned value. + \param [in] value Value to be saturated + \param [in] sat Bit position to saturate to (0..31) + \return Saturated value + */ +#define __USAT(ARG1,ARG2) \ +__extension__ \ +({ \ + uint32_t __RES, __ARG1 = (ARG1); \ + __ASM ("usat %0, %1, %2" : "=r" (__RES) : "I" (ARG2), "r" (__ARG1) ); \ + __RES; \ + }) + +/* ########################### Core Function Access ########################### */ + +/** + \brief Enable IRQ Interrupts + \details Enables IRQ interrupts by clearing the I-bit in the CPSR. + Can only be executed in Privileged modes. + */ +__STATIC_FORCEINLINE void __enable_irq(void) +{ + __ASM volatile ("cpsie i" : : : "memory"); +} + +/** + \brief Disable IRQ Interrupts + \details Disables IRQ interrupts by setting the I-bit in the CPSR. + Can only be executed in Privileged modes. + */ +__STATIC_FORCEINLINE void __disable_irq(void) +{ + __ASM volatile ("cpsid i" : : : "memory"); +} + +/** + \brief Get FPSCR + \details Returns the current value of the Floating Point Status/Control register. + \return Floating Point Status/Control register value +*/ +__STATIC_FORCEINLINE uint32_t __get_FPSCR(void) +{ + #if ((defined (__FPU_PRESENT) && (__FPU_PRESENT == 1U)) && \ + (defined (__FPU_USED ) && (__FPU_USED == 1U)) ) + #if __has_builtin(__builtin_arm_get_fpscr) + // Re-enable using built-in when GCC has been fixed + // || (__GNUC__ > 7) || (__GNUC__ == 7 && __GNUC_MINOR__ >= 2) + /* see https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00443.html */ + return __builtin_arm_get_fpscr(); + #else + uint32_t result; + + __ASM volatile ("VMRS %0, fpscr" : "=r" (result) ); + return(result); + #endif + #else + return(0U); + #endif +} + +/** + \brief Set FPSCR + \details Assigns the given value to the Floating Point Status/Control register. + \param [in] fpscr Floating Point Status/Control value to set +*/ +__STATIC_FORCEINLINE void __set_FPSCR(uint32_t fpscr) +{ + #if ((defined (__FPU_PRESENT) && (__FPU_PRESENT == 1U)) && \ + (defined (__FPU_USED ) && (__FPU_USED == 1U)) ) + #if __has_builtin(__builtin_arm_set_fpscr) + // Re-enable using built-in when GCC has been fixed + // || (__GNUC__ > 7) || (__GNUC__ == 7 && __GNUC_MINOR__ >= 2) + /* see https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00443.html */ + __builtin_arm_set_fpscr(fpscr); + #else + __ASM volatile ("VMSR fpscr, %0" : : "r" (fpscr) : "vfpcc", "memory"); + #endif + #else + (void)fpscr; + #endif +} + +/** \brief Get CPSR Register + \return CPSR Register value + */ +__STATIC_FORCEINLINE uint32_t __get_CPSR(void) +{ + uint32_t result; + __ASM volatile("MRS %0, cpsr" : "=r" (result) ); + return(result); +} + +/** \brief Set CPSR Register + \param [in] cpsr CPSR value to set + */ +__STATIC_FORCEINLINE void __set_CPSR(uint32_t cpsr) +{ +__ASM volatile ("MSR cpsr, %0" : : "r" (cpsr) : "memory"); +} + +/** \brief Get Mode + \return Processor Mode + */ +__STATIC_FORCEINLINE uint32_t __get_mode(void) +{ + return (__get_CPSR() & 0x1FU); +} + +/** \brief Set Mode + \param [in] mode Mode value to set + */ +__STATIC_FORCEINLINE void __set_mode(uint32_t mode) +{ + __ASM volatile("MSR cpsr_c, %0" : : "r" (mode) : "memory"); +} + +/** \brief Get Stack Pointer + \return Stack Pointer value + */ +__STATIC_FORCEINLINE uint32_t __get_SP(void) +{ + uint32_t result; + __ASM volatile("MOV %0, sp" : "=r" (result) : : "memory"); + return result; +} + +/** \brief Set Stack Pointer + \param [in] stack Stack Pointer value to set + */ +__STATIC_FORCEINLINE void __set_SP(uint32_t stack) +{ + __ASM volatile("MOV sp, %0" : : "r" (stack) : "memory"); +} + +/** \brief Get USR/SYS Stack Pointer + \return USR/SYS Stack Pointer value + */ +__STATIC_FORCEINLINE uint32_t __get_SP_usr(void) +{ + uint32_t cpsr = __get_CPSR(); + uint32_t result; + __ASM volatile( + "CPS #0x1F \n" + "MOV %0, sp " : "=r"(result) : : "memory" + ); + __set_CPSR(cpsr); + __ISB(); + return result; +} + +/** \brief Set USR/SYS Stack Pointer + \param [in] topOfProcStack USR/SYS Stack Pointer value to set + */ +__STATIC_FORCEINLINE void __set_SP_usr(uint32_t topOfProcStack) +{ + uint32_t cpsr = __get_CPSR(); + __ASM volatile( + "CPS #0x1F \n" + "MOV sp, %0 " : : "r" (topOfProcStack) : "memory" + ); + __set_CPSR(cpsr); + __ISB(); +} + +/** \brief Get FPEXC + \return Floating Point Exception Control register value + */ +__STATIC_FORCEINLINE uint32_t __get_FPEXC(void) +{ +#if (__FPU_PRESENT == 1) + uint32_t result; + __ASM volatile("VMRS %0, fpexc" : "=r" (result) ); + return(result); +#else + return(0); +#endif +} + +/** \brief Set FPEXC + \param [in] fpexc Floating Point Exception Control value to set + */ +__STATIC_FORCEINLINE void __set_FPEXC(uint32_t fpexc) +{ +#if (__FPU_PRESENT == 1) + __ASM volatile ("VMSR fpexc, %0" : : "r" (fpexc) : "memory"); +#endif +} + +/* + * Include common core functions to access Coprocessor 15 registers + */ + +#define __get_CP(cp, op1, Rt, CRn, CRm, op2) __ASM volatile("MRC p" # cp ", " # op1 ", %0, c" # CRn ", c" # CRm ", " # op2 : "=r" (Rt) : : "memory" ) +#define __set_CP(cp, op1, Rt, CRn, CRm, op2) __ASM volatile("MCR p" # cp ", " # op1 ", %0, c" # CRn ", c" # CRm ", " # op2 : : "r" (Rt) : "memory" ) +#define __get_CP64(cp, op1, Rt, CRm) __ASM volatile("MRRC p" # cp ", " # op1 ", %Q0, %R0, c" # CRm : "=r" (Rt) : : "memory" ) +#define __set_CP64(cp, op1, Rt, CRm) __ASM volatile("MCRR p" # cp ", " # op1 ", %Q0, %R0, c" # CRm : : "r" (Rt) : "memory" ) + +#include "cmsis_cp15.h" + +/** \brief Enable Floating Point Unit + + Critical section, called from undef handler, so systick is disabled + */ +__STATIC_INLINE void __FPU_Enable(void) +{ + __ASM volatile( + //Permit access to VFP/NEON, registers by modifying CPACR + " MRC p15,0,R1,c1,c0,2 \n" + " ORR R1,R1,#0x00F00000 \n" + " MCR p15,0,R1,c1,c0,2 \n" + + //Ensure that subsequent instructions occur in the context of VFP/NEON access permitted + " ISB \n" + + //Enable VFP/NEON + " VMRS R1,FPEXC \n" + " ORR R1,R1,#0x40000000 \n" + " VMSR FPEXC,R1 \n" + + //Initialise VFP/NEON registers to 0 + " MOV R2,#0 \n" + + //Initialise D16 registers to 0 + " VMOV D0, R2,R2 \n" + " VMOV D1, R2,R2 \n" + " VMOV D2, R2,R2 \n" + " VMOV D3, R2,R2 \n" + " VMOV D4, R2,R2 \n" + " VMOV D5, R2,R2 \n" + " VMOV D6, R2,R2 \n" + " VMOV D7, R2,R2 \n" + " VMOV D8, R2,R2 \n" + " VMOV D9, R2,R2 \n" + " VMOV D10,R2,R2 \n" + " VMOV D11,R2,R2 \n" + " VMOV D12,R2,R2 \n" + " VMOV D13,R2,R2 \n" + " VMOV D14,R2,R2 \n" + " VMOV D15,R2,R2 \n" + +#if (defined(__ARM_NEON) && (__ARM_NEON == 1)) + //Initialise D32 registers to 0 + " VMOV D16,R2,R2 \n" + " VMOV D17,R2,R2 \n" + " VMOV D18,R2,R2 \n" + " VMOV D19,R2,R2 \n" + " VMOV D20,R2,R2 \n" + " VMOV D21,R2,R2 \n" + " VMOV D22,R2,R2 \n" + " VMOV D23,R2,R2 \n" + " VMOV D24,R2,R2 \n" + " VMOV D25,R2,R2 \n" + " VMOV D26,R2,R2 \n" + " VMOV D27,R2,R2 \n" + " VMOV D28,R2,R2 \n" + " VMOV D29,R2,R2 \n" + " VMOV D30,R2,R2 \n" + " VMOV D31,R2,R2 \n" +#endif + + //Initialise FPSCR to a known state + " VMRS R2,FPSCR \n" + " LDR R3,=0x00086060 \n" //Mask off all bits that do not have to be preserved. Non-preserved bits can/should be zero. + " AND R2,R2,R3 \n" + " VMSR FPSCR,R2 " + ); +} + +#pragma GCC diagnostic pop + +#endif /* __CMSIS_GCC_H */ -- cgit