From: Bin Meng <bmeng.cn@gmail.com>
To: Ruinland Chuan-Tzu Tsai <ruinland@andestech.com>
Cc: wangjunqiang <wangjunqiang@iscas.ac.cn>,
Bin Meng <bin.meng@windriver.com>,
"open list:RISC-V" <qemu-riscv@nongnu.org>,
"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
Dylan Jhong <dylan@andestech.com>
Subject: Re: [RFC PATCH v4 4/4] Enable custom CSR logic for Andes AX25 and A25
Date: Fri, 6 Aug 2021 14:14:54 +0800 [thread overview]
Message-ID: <CAEUhbmU+EezdH8pFBndukUzBwhO-WpOUw8Dpq7Z_f2RggaBwCw@mail.gmail.com> (raw)
In-Reply-To: <20210805175626.11573-5-ruinland@andestech.com>
On Fri, Aug 6, 2021 at 1:57 AM Ruinland Chuan-Tzu Tsai
<ruinland@andestech.com> wrote:
>
> From: Ruinalnd ChuanTzu Tsai <ruinland@andestech.com>
>
> In this patch we enabled custom CSR logic for Andes AX25 and A25 logic.
> Hence csr_andes.inc.c and andes_cpu_bits.h is added.
>
> Signed-off-by: Dylan Jhong <dylan@andestech.com>
> ---
> target/riscv/andes_cpu_bits.h | 124 +++++++++++++++++++++++++
> target/riscv/cpu.c | 12 +++
> target/riscv/csr.c | 2 +-
> target/riscv/csr_andes.inc.c | 160 +++++++++++++++++++++++++++++++++
> target/riscv/custom_cpu_bits.h | 6 +-
> 5 files changed, 302 insertions(+), 2 deletions(-)
> create mode 100644 target/riscv/andes_cpu_bits.h
> create mode 100644 target/riscv/csr_andes.inc.c
>
> diff --git a/target/riscv/andes_cpu_bits.h b/target/riscv/andes_cpu_bits.h
> new file mode 100644
> index 0000000..bd2b7d1
> --- /dev/null
> +++ b/target/riscv/andes_cpu_bits.h
> @@ -0,0 +1,124 @@
> +/*
> + * Andes custom CSRs bit definitions
> + *
> + * Copyright (c) 2021 Andes Technology Corp.
> + * SPDX-License-Identifier: GPL-2.0+
nits: please put the license at the beginning of this comment block
> + */
> +
> +/* ========= Missing drafted/standard CSR definitions */
> +/* Although TINFO is in official debug sepc, it's not in cpu_bits.h yet. */
> +#define CSR_TINFO 0x7a4
> +
> +/* ========= AndeStar V5 machine mode CSRs ========= */
> +/* Configuration Registers */
> +#define CSR_MICM_CFG 0xfc0
> +#define CSR_MDCM_CFG 0xfc1
> +#define CSR_MMSC_CFG 0xfc2
> +#define CSR_MMSC_CFG2 0xfc3
> +#define CSR_MVEC_CFG 0xfc7
> +
> +/* Crash Debug CSRs */
> +#define CSR_MCRASH_STATESAVE 0xfc8
> +#define CSR_MSTATUS_CRASHSAVE 0xfc9
> +
> +/* Memory CSRs */
> +#define CSR_MILMB 0x7c0
> +#define CSR_MDLMB 0x7c1
> +#define CSR_MECC_CODE 0x7C2
nits: please make 0x7C2 lower cases
> +#define CSR_MNVEC 0x7c3
> +#define CSR_MCACHE_CTL 0x7ca
> +#define CSR_MCCTLBEGINADDR 0x7cb
> +#define CSR_MCCTLCOMMAND 0x7cc
> +#define CSR_MCCTLDATA 0x7cd
> +#define CSR_MPPIB 0x7f0
> +#define CSR_MFIOB 0x7f1
> +
> +/* Hardware Stack Protection & Recording */
> +#define CSR_MHSP_CTL 0x7c6
> +#define CSR_MSP_BOUND 0x7c7
> +#define CSR_MSP_BASE 0x7c8
> +#define CSR_MXSTATUS 0x7c4
> +#define CSR_MDCAUSE 0x7c9
> +#define CSR_MSLIDELEG 0x7d5
> +#define CSR_MSAVESTATUS 0x7d6
> +#define CSR_MSAVEEPC1 0x7d7
> +#define CSR_MSAVECAUSE1 0x7d8
> +#define CSR_MSAVEEPC2 0x7d9
> +#define CSR_MSAVECAUSE2 0x7da
> +#define CSR_MSAVEDCAUSE1 0x7db
> +#define CSR_MSAVEDCAUSE2 0x7dc
> +
> +/* Control CSRs */
> +#define CSR_MPFT_CTL 0x7c5
> +#define CSR_MMISC_CTL 0x7d0
> +#define CSR_MCLK_CTL 0x7df
> +
> +/* Counter related CSRs */
> +#define CSR_MCOUNTERWEN 0x7ce
> +#define CSR_MCOUNTERINTEN 0x7cf
> +#define CSR_MCOUNTERMASK_M 0x7d1
> +#define CSR_MCOUNTERMASK_S 0x7d2
> +#define CSR_MCOUNTERMASK_U 0x7d3
> +#define CSR_MCOUNTEROVF 0x7d4
> +
> +/* Enhanced CLIC CSRs */
> +#define CSR_MIRQ_ENTRY 0x7ec
> +#define CSR_MINTSEL_JAL 0x7ed
> +#define CSR_PUSHMCAUSE 0x7ee
> +#define CSR_PUSHMEPC 0x7ef
> +#define CSR_PUSHMXSTATUS 0x7eb
> +
> +/* Andes Physical Memory Attribute(PMA) CSRs */
> +#define CSR_PMACFG0 0xbc0
> +#define CSR_PMACFG1 0xbc1
> +#define CSR_PMACFG2 0xbc2
> +#define CSR_PMACFG3 0xbc3
> +#define CSR_PMAADDR0 0xbd0
> +#define CSR_PMAADDR1 0xbd1
> +#define CSR_PMAADDR2 0xbd2
> +#define CSR_PMAADDR3 0xbd2
> +#define CSR_PMAADDR4 0xbd4
> +#define CSR_PMAADDR5 0xbd5
> +#define CSR_PMAADDR6 0xbd6
> +#define CSR_PMAADDR7 0xbd7
> +#define CSR_PMAADDR8 0xbd8
> +#define CSR_PMAADDR9 0xbd9
> +#define CSR_PMAADDR10 0xbda
> +#define CSR_PMAADDR11 0xbdb
> +#define CSR_PMAADDR12 0xbdc
> +#define CSR_PMAADDR13 0xbdd
> +#define CSR_PMAADDR14 0xbde
> +#define CSR_PMAADDR15 0xbdf
> +
> +/* ========= AndeStar V5 supervisor mode CSRs ========= */
> +/* Supervisor trap registers */
> +#define CSR_SLIE 0x9c4
> +#define CSR_SLIP 0x9c5
> +#define CSR_SDCAUSE 0x9c9
> +
> +/* Supervisor counter registers */
> +#define CSR_SCOUNTERINTEN 0x9cf
> +#define CSR_SCOUNTERMASK_M 0x9d1
> +#define CSR_SCOUNTERMASK_S 0x9d2
> +#define CSR_SCOUNTERMASK_U 0x9d3
> +#define CSR_SCOUNTEROVF 0x9d4
> +#define CSR_SCOUNTINHIBIT 0x9e0
> +#define CSR_SHPMEVENT3 0x9e3
> +#define CSR_SHPMEVENT4 0x9e4
> +#define CSR_SHPMEVENT5 0x9e5
> +#define CSR_SHPMEVENT6 0x9e6
> +
> +/* Supervisor control registers */
> +#define CSR_SCCTLDATA 0x9cd
> +#define CSR_SMISC_CTL 0x9d0
> +
> +/* ========= AndeStar V5 user mode CSRs ========= */
> +/* User mode control registers */
> +#define CSR_UITB 0x800
> +#define CSR_UCODE 0x801
> +#define CSR_UDCAUSE 0x809
> +#define CSR_UCCTLBEGINADDR 0x80b
> +#define CSR_UCCTLCOMMAND 0x80c
> +#define CSR_WFE 0x810
> +#define CSR_SLEEPVALUE 0x811
> +#define CSR_TXEVT 0x812
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index 9eb1e3a..d1d4773 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -187,6 +187,12 @@ static void ax25_cpu_init(Object *obj)
> CPURISCVState *env = &RISCV_CPU(obj)->env;
> set_misa(env, RV64 | RVI | RVM | RVA | RVF | RVD | RVC | RVS | RVU);
> set_priv_version(env, PRIV_VERSION_1_10_0);
> +
> + #if defined(CONFIG_RISCV_CUSTOM)
nits: no space before #if
> + /* setup custom csr handler hash table */
> + setup_custom_csr(env, andes_custom_csr_table);
> + env->custom_csr_val = g_malloc(andes_custom_csr_size);
> + #endif
> }
>
> static void rv64_sifive_u_cpu_init(Object *obj)
> @@ -248,6 +254,12 @@ static void a25_cpu_init(Object *obj)
> CPURISCVState *env = &RISCV_CPU(obj)->env;
> set_misa(env, RV32 | RVI | RVM | RVA | RVF | RVD | RVC | RVS | RVU);
> set_priv_version(env, PRIV_VERSION_1_10_0);
> +
> + #if defined(CONFIG_RISCV_CUSTOM)
> + /* setup custom csr handler hash table */
> + setup_custom_csr(env, andes_custom_csr_table);
> + env->custom_csr_val = g_malloc(andes_custom_csr_size);
> + #endif
> }
> #endif
>
> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> index 1c4dc94..9c16b88 100644
> --- a/target/riscv/csr.c
> +++ b/target/riscv/csr.c
> @@ -1421,7 +1421,7 @@ int riscv_csrrw_debug(CPURISCVState *env, int csrno, target_ulong *ret_value,
> }
>
> #if defined(CONFIG_RISCV_CUSTOM)
> -/* Include the custom CSR table here. */
> +#include "csr_andes.inc.c"
> #endif
>
> /* Control and Status Register function table */
> diff --git a/target/riscv/csr_andes.inc.c b/target/riscv/csr_andes.inc.c
> new file mode 100644
> index 0000000..da226b0
> --- /dev/null
> +++ b/target/riscv/csr_andes.inc.c
> @@ -0,0 +1,160 @@
> +/*
> + * Andes custom CSR table and handling functions
> + *
> + * Copyright (c) 2021 Andes Technology Corp.
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +static int write_uitb(CPURISCVState *env, int csrno, target_ulong val);
> +static int read_uitb(CPURISCVState *env, int csrno, target_ulong *val);
> +
> +struct andes_csr_val {
> + target_long uitb;
> +};
> +
> +static int read_mmsc_cfg(CPURISCVState *env, int csrno, target_ulong *val)
> +{
> + /* enable pma probe */
> + *val = 0x40000000;
> + return 0;
> +}
> +
> +static int write_uitb(CPURISCVState *env, int csrno, target_ulong val)
> +{
> + struct andes_csr_val *andes_csr = env->custom_csr_val;
> + andes_csr->uitb = val;
> + return 0;
> +}
> +
> +static int read_uitb(CPURISCVState *env, int csrno, target_ulong *val)
> +{
> + struct andes_csr_val *andes_csr = env->custom_csr_val;
> + *val = andes_csr->uitb;
> + return 0;
> +}
> +
> +
> +int andes_custom_csr_size = sizeof(struct andes_csr_val);
> +riscv_custom_csr_operations andes_custom_csr_table[MAX_CUSTOM_CSR_NUM] = {
> + /* ==================== AndeStar V5 machine mode CSRs ==================== */
> + /* Configuration Registers */
> + {CSR_MICM_CFG, { "micm_cfg", any, read_zero, write_stub} },
> + {CSR_MDCM_CFG, { "mdcm_cfg", any, read_zero, write_stub} },
> + {CSR_MMSC_CFG, { "mmsc_cfg", any, read_mmsc_cfg, write_stub} },
> + {CSR_MMSC_CFG2, { "mmsc_cfg2", any, read_zero, write_stub} },
> + {CSR_MVEC_CFG, { "mvec_cfg", any, read_zero, write_stub} },
> +
> + /* Crash Debug CSRs */
> + {CSR_MCRASH_STATESAVE, { "mcrash_statesave", any, read_zero, write_stub} },
> + {CSR_MSTATUS_CRASHSAVE, { "mstatus_crashsave", any, read_zero, write_stub} },
> +
> + /* Memory CSRs */
> + {CSR_MILMB, { "milmb", any, read_zero, write_stub} },
> + {CSR_MDLMB, { "mdlmb", any, read_zero, write_stub} },
> + {CSR_MECC_CODE, { "mecc_code", any, read_zero, write_stub} },
> + {CSR_MNVEC, { "mnvec", any, read_zero, write_stub} },
> + {CSR_MCACHE_CTL, { "mcache_ctl", any, read_zero, write_stub} },
> + {CSR_MCCTLBEGINADDR, { "mcctlbeginaddr", any, read_zero, write_stub} },
> + {CSR_MCCTLCOMMAND, { "mcctlcommand", any, read_zero, write_stub} },
> + {CSR_MCCTLDATA, { "mcctldata", any, read_zero, write_stub} },
> + {CSR_MPPIB, { "mppib", any, read_zero, write_stub} },
> + {CSR_MFIOB, { "mfiob", any, read_zero, write_stub} },
> +
> + /* Hardware Stack Protection & Recording */
> + {CSR_MHSP_CTL, { "mhsp_ctl", any, read_zero, write_stub} },
> + {CSR_MSP_BOUND, { "msp_bound", any, read_zero, write_stub} },
> + {CSR_MSP_BASE, { "msp_base", any, read_zero, write_stub} },
> + {CSR_MXSTATUS, { "mxstatus", any, read_zero, write_stub} },
> + {CSR_MDCAUSE, { "mdcause", any, read_zero, write_stub} },
> + {CSR_MSLIDELEG, { "mslideleg", any, read_zero, write_stub} },
> + {CSR_MSAVESTATUS, { "msavestatus", any, read_zero, write_stub} },
> + {CSR_MSAVEEPC1, { "msaveepc1", any, read_zero, write_stub} },
> + {CSR_MSAVECAUSE1, { "msavecause1", any, read_zero, write_stub} },
> + {CSR_MSAVEEPC2, { "msaveepc2", any, read_zero, write_stub} },
> + {CSR_MSAVECAUSE2, { "msavecause2", any, read_zero, write_stub} },
> + {CSR_MSAVEDCAUSE1, { "msavedcause1", any, read_zero, write_stub} },
> + {CSR_MSAVEDCAUSE2, { "msavedcause2", any, read_zero, write_stub} },
> +
> + /* Control CSRs */
> + {CSR_MPFT_CTL, { "mpft_ctl", any, read_zero, write_stub} },
> + {CSR_MMISC_CTL, { "mmisc_ctl", any, read_zero, write_stub} },
> + {CSR_MCLK_CTL, { "mclk_ctl", any, read_zero, write_stub} },
> +
> + /* Counter related CSRs */
> + {CSR_MCOUNTERWEN, { "mcounterwen", any, read_zero, write_stub} },
> + {CSR_MCOUNTERINTEN, { "mcounterinten", any, read_zero, write_stub} },
> + {CSR_MCOUNTERMASK_M, { "mcountermask_m", any, read_zero, write_stub} },
> + {CSR_MCOUNTERMASK_S, { "mcountermask_s", any, read_zero, write_stub} },
> + {CSR_MCOUNTERMASK_U, { "mcountermask_u", any, read_zero, write_stub} },
> + {CSR_MCOUNTEROVF, { "mcounterovf", any, read_zero, write_stub} },
> +
> + /* Enhanced CLIC CSRs */
> + {CSR_MIRQ_ENTRY, { "mirq_entry", any, read_zero, write_stub} },
> + {CSR_MINTSEL_JAL, { "mintsel_jal", any, read_zero, write_stub} },
> + {CSR_PUSHMCAUSE, { "pushmcause", any, read_zero, write_stub} },
> + {CSR_PUSHMEPC, { "pushmepc", any, read_zero, write_stub} },
> + {CSR_PUSHMXSTATUS, { "pushmxstatus", any, read_zero, write_stub} },
> +
> + /* Andes Physical Memory Attribute(PMA) CSRs */
> + {CSR_PMACFG0, { "pmacfg0", any, read_zero, write_stub} },
> + {CSR_PMACFG1, { "pmacfg1", any, read_zero, write_stub} },
> + {CSR_PMACFG2, { "pmacfg2", any, read_zero, write_stub} },
> + {CSR_PMACFG3, { "pmacfg3", any, read_zero, write_stub} },
> + {CSR_PMAADDR0, { "pmaaddr0", any, read_zero, write_stub} },
> + {CSR_PMAADDR1, { "pmaaddr1", any, read_zero, write_stub} },
> + {CSR_PMAADDR2, { "pmaaddr2", any, read_zero, write_stub} },
> + {CSR_PMAADDR3, { "pmaaddr3", any, read_zero, write_stub} },
> + {CSR_PMAADDR4, { "pmaaddr4", any, read_zero, write_stub} },
> + {CSR_PMAADDR5, { "pmaaddr5", any, read_zero, write_stub} },
> + {CSR_PMAADDR6, { "pmaaddr6", any, read_zero, write_stub} },
> + {CSR_PMAADDR7, { "pmaaddr7", any, read_zero, write_stub} },
> + {CSR_PMAADDR8, { "pmaaddr8", any, read_zero, write_stub} },
> + {CSR_PMAADDR9, { "pmaaddr9", any, read_zero, write_stub} },
> + {CSR_PMAADDR10, { "pmaaddr10", any, read_zero, write_stub} },
> + {CSR_PMAADDR11, { "pmaaddr11", any, read_zero, write_stub} },
> + {CSR_PMAADDR12, { "pmaaddr12", any, read_zero, write_stub} },
> + {CSR_PMAADDR13, { "pmaaddr13", any, read_zero, write_stub} },
> + {CSR_PMAADDR14, { "pmaaddr14", any, read_zero, write_stub} },
> + {CSR_PMAADDR15, { "pmaaddr15", any, read_zero, write_stub} },
> +
> + /* Debug/Trace Registers (shared with Debug Mode) */
> + {CSR_TSELECT, { "tselect", any, read_zero, write_stub} },
> + {CSR_TDATA1, { "tdata1", any, read_zero, write_stub} },
> + {CSR_TDATA2, { "tdata2", any, read_zero, write_stub} },
> + {CSR_TDATA3, { "tdata3", any, read_zero, write_stub} },
> + {CSR_TINFO, { "tinfo", any, read_zero, write_stub} },
> +
> + /* ================== AndeStar V5 supervisor mode CSRs ================== */
> + /* Supervisor trap registers */
> + {CSR_SLIE, { "slie", any, read_zero, write_stub} },
> + {CSR_SLIP, { "slip", any, read_zero, write_stub} },
> + {CSR_SDCAUSE, { "sdcause", any, read_zero, write_stub} },
> +
> + /* Supervisor counter registers */
> + {CSR_SCOUNTERINTEN, { "scounterinten", any, read_zero, write_stub} },
> + {CSR_SCOUNTERMASK_M, { "scountermask_m", any, read_zero, write_stub} },
> + {CSR_SCOUNTERMASK_S, { "scountermask_s", any, read_zero, write_stub} },
> + {CSR_SCOUNTERMASK_U, { "scountermask_u", any, read_zero, write_stub} },
> + {CSR_SCOUNTEROVF, { "scounterovf", any, read_zero, write_stub} },
> + {CSR_SCOUNTINHIBIT, { "scountinhibit", any, read_zero, write_stub} },
> + {CSR_SHPMEVENT3, { "shpmevent3", any, read_zero, write_stub} },
> + {CSR_SHPMEVENT4, { "shpmevent4", any, read_zero, write_stub} },
> + {CSR_SHPMEVENT5, { "shpmevent5", any, read_zero, write_stub} },
> + {CSR_SHPMEVENT6, { "shpmevent6", any, read_zero, write_stub} },
> +
> + /* Supervisor control registers */
> + {CSR_SCCTLDATA, { "scctldata", any, read_zero, write_stub} },
> + {CSR_SMISC_CTL, { "smisc_ctl", any, read_zero, write_stub} },
> +
> + /* ===================== AndeStar V5 user mode CSRs ===================== */
> + /* User mode control registers */
> + {CSR_UITB, { "uitb", any, read_uitb, write_uitb} },
> + {CSR_UCODE, { "ucode", any, read_zero, write_stub} },
> + {CSR_UDCAUSE, { "udcause", any, read_zero, write_stub} },
> + {CSR_UCCTLBEGINADDR, { "ucctlbeginaddr", any, read_zero, write_stub} },
> + {CSR_UCCTLCOMMAND, { "ucctlcommand", any, read_zero, write_stub} },
> + {CSR_WFE, { "wfe", any, read_zero, write_stub} },
> + {CSR_SLEEPVALUE, { "sleepvalue", any, read_zero, write_stub} },
> + {CSR_TXEVT, { "csr_txevt", any, read_zero, write_stub} },
> + {0, { "", NULL, NULL, NULL } },
> + };
> diff --git a/target/riscv/custom_cpu_bits.h b/target/riscv/custom_cpu_bits.h
> index 5df31f8..ba67e95 100644
> --- a/target/riscv/custom_cpu_bits.h
> +++ b/target/riscv/custom_cpu_bits.h
> @@ -5,4 +5,8 @@
> * SPDX-License-Identifier: GPL-2.0+
> */
>
> -/* This file is intentionally left blank at this commit. */
> +/*
> + * XXX: Maybe we should add a "target-list"-like option to toggle enabled
> + * custom CSR variations ?
As I mentioned in patch 1, we'd better use a Kconfig option. This
Koption option should be selected by the Andes machine.
> + */
> +#include "andes_cpu_bits.h"
> --
Regards,
Bin
next prev parent reply other threads:[~2021-08-06 6:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-05 17:56 [RFC PATCH v4 0/4] Add basic support for custom CSR Ruinland Chuan-Tzu Tsai
2021-08-05 17:56 ` [RFC PATCH v4 1/4] Add options to config/meson files " Ruinland Chuan-Tzu Tsai
2021-08-06 2:39 ` Bin Meng
2021-08-06 2:41 ` Bin Meng
2021-08-05 17:56 ` [RFC PATCH v4 2/4] Adding basic custom/vendor CSR handling mechanism Ruinland Chuan-Tzu Tsai
2021-08-06 3:35 ` Bin Meng
2021-08-06 6:07 ` Ruinland Chuan-Tzu Tsa(蔡傳資)
2021-08-06 6:19 ` Bin Meng
2021-08-13 5:20 ` Alistair Francis
2021-08-05 17:56 ` [RFC PATCH v4 3/4] Adding Andes AX25 and A25 CPU model Ruinland Chuan-Tzu Tsai
2021-08-06 3:40 ` Bin Meng
2021-08-06 6:11 ` Ruinland Chuan-Tzu Tsa(蔡傳資)
2021-08-06 9:50 ` Bin Meng
2021-08-13 5:23 ` Alistair Francis
2021-08-05 17:56 ` [RFC PATCH v4 4/4] Enable custom CSR logic for Andes AX25 and A25 Ruinland Chuan-Tzu Tsai
2021-08-06 6:14 ` Bin Meng [this message]
2021-08-13 5:33 ` [RFC PATCH v4 0/4] Add basic support for custom CSR Alistair Francis
-- strict thread matches above, loose matches on Subject: below --
2021-08-06 13:06 [RFC PATCH v4 4/4] Enable custom CSR logic for Andes AX25 and A25 Jessica Clarke
2021-08-06 13:08 ` Jessica Clarke
2021-08-13 5:28 ` Alistair Francis
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--in-reply-to=CAEUhbmU+EezdH8pFBndukUzBwhO-WpOUw8Dpq7Z_f2RggaBwCw@mail.gmail.com \
--to=bmeng.cn@gmail.com \
--cc=bin.meng@windriver.com \
--cc=dylan@andestech.com \
--cc=qemu-devel@nongnu.org \
--cc=qemu-riscv@nongnu.org \
--cc=ruinland@andestech.com \
--cc=wangjunqiang@iscas.ac.cn \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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