TMS570: Add a place holder for the TMS570. Not much there yet
This commit is contained in:
Gregory Nutt
parent
c1933a0814
commit
8fb76cf970
118
arch/arm/src/armv7-r/arm_signal_handler.S
Normal file
118
arch/arm/src/armv7-r/arm_signal_handler.S
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@ -0,0 +1,118 @@
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/****************************************************************************
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* arch/arm/src/armv7-r/arm_signal_handler.S
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <arch/syscall.h>
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#if defined(CONFIG_BUILD_PROTECTED) && !defined(__KERNEL__)
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/****************************************************************************
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* File info
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****************************************************************************/
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.syntax unified
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.thumb
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.cpu cortex-r4
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.file "arm_signal_handler.S"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_signal_handler
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*
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* Description:
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* This function is the user-space, signal handler trampoline function. It
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* is called from up_signal_dispatch() in user-mode.
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*
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* R0-R3, R11 - volatile registers need not be preserved.
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* R4-R10 - static registers must be preserved
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* R12-R14 - LR and SP must be preserved
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*
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* Inputs:
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* R0 = sighand
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* The address user-space signal handling function
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* R1-R3 = signo, info, and ucontext
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* Standard arguments to be passed to the signal handling function.
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*
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* Return:
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* None. This function does not return in the normal sense. It returns
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* via the SYS_signal_handler_return (see svcall.h)
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*
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****************************************************************************/
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.text
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.thumb_func
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.globl up_signal_handler
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.type up_signal_handler, function
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up_signal_handler:
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/* Save some register */
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push {lr} /* Save LR on the stack */
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/* Call the signal handler */
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mov ip, r0 /* IP=sighand */
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mov r0, r1 /* R0=signo */
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mov r1, r2 /* R1=info */
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mov r2, r3 /* R2=ucontext */
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blx ip /* Call the signal handler */
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/* Restore the registers */
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pop {r2} /* Recover LR in R2 */
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mov lr, r2 /* Restore LR */
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/* Execute the SYS_signal_handler_return SVCall (will not return) */
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mov r0, #SYS_signal_handler_return
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svc 0
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nop
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.size up_signal_handler, .-up_signal_handler
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.end
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#endif /* CONFIG_BUILD_PROTECTED && !__KERNEL__ */
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19
arch/arm/src/tms570/Kconfig
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19
arch/arm/src/tms570/Kconfig
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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if ARCH_CHIP_TMS570
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comment "TMS570 Configuration Options"
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# Chip Capabilities
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# Summary configuratinos
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# Chip Selection
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#menu "TMS570 Peripheral Support"
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# endmenu # TMS570 Peripheral Support
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endif # ARCH_CHIP_TMS570
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108
arch/arm/src/tms570/Make.defs
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108
arch/arm/src/tms570/Make.defs
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@ -0,0 +1,108 @@
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############################################################################
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# arch/arm/tms570/Make.defs
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#
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# Copyright (C) 2015 Gregory Nutt. All rights reserved.
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# Author: Gregory Nutt <gnutt@nuttx.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
|
||||
#
|
||||
# 1. Redistributions of source code must retain the above copyright
|
||||
# notice, this list of conditions and the following disclaimer.
|
||||
# 2. Redistributions in binary form must reproduce the above copyright
|
||||
# notice, this list of conditions and the following disclaimer in
|
||||
# the documentation and/or other materials provided with the
|
||||
# distribution.
|
||||
# 3. Neither the name Gregory Nutt nor the names of its contributors may be
|
||||
# used to endorse or promote products derived from this software
|
||||
# without specific prior written permission.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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############################################################################
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# The vector table is the "head" object, i.e., the one that must forced into
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# the link in order to draw in all of the other components
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HEAD_ASRC = arm_vectortab.S
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# Common assembly language files
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CMN_ASRCS += arm_vectors.S arm_fpuconfig.S arm_fullcontextrestore.S
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CMN_ASRCS += arm_saveusercontext.S arm_vectoraddrexcptn.S arm_vfork.S
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CMN_ASRCS += cp15_coherent_dcache.S cp15_invalidate_dcache.S
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CMN_ASRCS += cp15_clean_dcache.S cp15_flush_dcache.S cp15_invalidate_dcache_all.S
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# Configuration dependent assembly language files
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ifeq ($(CONFIG_ARCH_MEMCPY),y)
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CMN_ASRCS += arm_memcpy.S
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endif
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# Common C source files
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CMN_CSRCS = up_initialize.c up_idle.c up_interruptcontext.c up_exit.c
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CMN_CSRCS += up_createstack.c up_releasestack.c up_usestack.c up_vfork.c
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CMN_CSRCS += up_puts.c up_mdelay.c up_stackframe.c up_udelay.c
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CMN_CSRCS += up_modifyreg8.c up_modifyreg16.c up_modifyreg32.c
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CMN_CSRCS += arm_assert.c arm_blocktask.c arm_copyfullstate.c arm_dataabort.c
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CMN_CSRCS += arm_doirq.c arm_initialstate.c arm_mmu.c arm_prefetchabort.c
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CMN_CSRCS += arm_releasepending.c arm_reprioritizertr.c
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CMN_CSRCS += arm_schedulesigaction.c arm_sigdeliver.c arm_syscall.c
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CMN_CSRCS += arm_unblocktask.c arm_undefinedinsn.c
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# Configuration dependent C files
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ifeq ($(CONFIG_BUILD_PROTECTED),y)
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CMN_CSRCS += arm_mpu.c up_task_start.c up_pthread_start.c
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ifneq ($(CONFIG_DISABLE_SIGNALS),y)
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CMN_CSRCS += arm_signal_dispatch.c
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CMN_UASRCS += arm_signal_handler.S
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endif
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endif
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ifeq ($(CONFIG_ARMV7R_L2CC_PL310),y)
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CMN_CSRCS += arm_l2cc_pl310.c
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endif
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ifeq ($(CONFIG_ELF),y)
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CMN_CSRCS += arm_elf.c arm_coherent_dcache.c
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else ifeq ($(CONFIG_MODULE),y)
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CMN_CSRCS += arm_elf.c arm_coherent_dcache.c
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endif
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ifeq ($(CONFIG_ARCH_FPU),y)
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CMN_ASRCS += arm_savefpu.S arm_restorefpu.S
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CMN_CSRCS += arm_copyarmstate.c
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endif
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ifeq ($(CONFIG_STACK_COLORATION),y)
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CMN_CSRCS += up_checkstack.c
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endif
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# SAMA5-specific assembly language files
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CHIP_ASRCS =
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# SAMA5-specific C source files
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CHIP_CSRCS = tms570_boot.c
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# Configuration dependent C and assembly language files
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ifneq ($(CONFIG_SCHED_TICKLESS),y)
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CHIP_CSRCS += tms570_timerisr.c
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endif
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63
arch/arm/src/tms570/chip.h
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63
arch/arm/src/tms570/chip.h
Normal file
@ -0,0 +1,63 @@
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/************************************************************************************
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* arch/arm/src/tms570/chip.h
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
|
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* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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#ifndef __ARCH_ARM_SRC_TMS570_CHIP_H
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#define __ARCH_ARM_SRC_TMS570_CHIP_H
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <arch/tms570/chip.h>
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#include "chip/tms570_memorymap.h"
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* arch/arm/src/armv7-a/l2cc_pl310.h includes this file and expects it to provide the
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* address of the L2CC-PL310 implementation.
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*/
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#define L2CC_VBASE SAM_L2CC_VSECTION
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/* Cache line sizes (in bytes)for the SAVA5Dx */
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#define ARMV7A_DCACHE_LINESIZE 32 /* 32 bytes (8 words) */
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#define ARMV7A_ICACHE_LINESIZE 32 /* 32 bytes (8 words) */
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#endif /* __ARCH_ARM_SRC_TMS570_CHIP_H */
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263
arch/arm/src/tms570/tms570_boot.c
Normal file
263
arch/arm/src/tms570/tms570_boot.c
Normal file
@ -0,0 +1,263 @@
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/****************************************************************************
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* arch/arm/src/tms570/tms570_boot.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
#include <stdint.h>
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#include <assert.h>
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#include <debug.h>
|
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|
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#include <arch/board/board.h>
|
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|
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#include "chip.h"
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#include "arm.h"
|
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#include "cache.h"
|
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#include "fpu.h"
|
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#include "up_internal.h"
|
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#include "up_arch.h"
|
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|
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/****************************************************************************
|
||||
* Public Data
|
||||
****************************************************************************/
|
||||
|
||||
/* Symbols defined via the linker script */
|
||||
|
||||
extern uint32_t _vector_start; /* Beginning of vector block */
|
||||
extern uint32_t _vector_end; /* End+1 of vector block */
|
||||
|
||||
/****************************************************************************
|
||||
* Private Data
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Private Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: tms570_vectorsize
|
||||
*
|
||||
* Description:
|
||||
* Return the size of the vector data
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline size_t tms570_vectorsize(void)
|
||||
{
|
||||
uintptr_t src;
|
||||
uintptr_t end;
|
||||
|
||||
src = (uintptr_t)&_vector_start;
|
||||
end = (uintptr_t)&_vector_end;
|
||||
|
||||
return (size_t)(end - src);
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: tms570_copyvectorblock
|
||||
*
|
||||
* Description:
|
||||
* Copy the interrupt block to its final destination. Vectors are already
|
||||
* positioned at the beginning of the text region and only need to be
|
||||
* copied in the case where we are using high vectors or where the beginning
|
||||
* of the text region cannot be remapped to address zero.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#if !defined(CONFIG_ARCH_LOWVECTORS)
|
||||
static void tms570_copyvectorblock(void)
|
||||
{
|
||||
uint32_t *src;
|
||||
uint32_t *end;
|
||||
uint32_t *dest;
|
||||
|
||||
/* Copy the vectors into ISRAM at the address that will be mapped to the vector
|
||||
* address:
|
||||
*
|
||||
* SAM_VECTOR_PADDR - Unmapped, physical address of vector table in SRAM
|
||||
* SAM_VECTOR_VSRAM - Virtual address of vector table in SRAM
|
||||
* SAM_VECTOR_VADDR - Virtual address of vector table (0x00000000 or
|
||||
* 0xffff0000)
|
||||
*/
|
||||
|
||||
src = (uint32_t *)&_vector_start;
|
||||
end = (uint32_t *)&_vector_end;
|
||||
dest = (uint32_t *)SAM_VECTOR_VSRAM;
|
||||
|
||||
while (src < end)
|
||||
{
|
||||
*dest++ = *src++;
|
||||
}
|
||||
|
||||
/* Flush the DCache to assure that the vector data is in physical in ISRAM */
|
||||
|
||||
arch_clean_dcache((uintptr_t)SAM_VECTOR_VSRAM,
|
||||
(uintptr_t)SAM_VECTOR_VSRAM + tms570_vectorsize());
|
||||
#endif
|
||||
}
|
||||
|
||||
#else
|
||||
/* Don't copy the vectors */
|
||||
|
||||
# define tms570_copyvectorblock()
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: tms570_wdtdisable
|
||||
*
|
||||
* Description:
|
||||
* Disable the watchdog timer.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef CONFIG_TMS570_WDT
|
||||
static inline void tms570_wdtdisable(void)
|
||||
{
|
||||
#warning Missing logic
|
||||
}
|
||||
#else
|
||||
# define tms570_wdtdisable()
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: arm_boot
|
||||
*
|
||||
* Description:
|
||||
* Complete boot operations started in arm_head.S
|
||||
*
|
||||
* Boot Sequence
|
||||
*
|
||||
* 1. The __start entry point in armv7-r/arm_head.S is invoked upon power-
|
||||
* on reset.
|
||||
* 2. __start prepares CPU for code execution.
|
||||
* 3a. If CONFIG_BOOT_SDRAM_DATA is not defined, then __start will prepare
|
||||
* memory resources by calling arm_data_initialize() and will then
|
||||
* call this function.
|
||||
* 3b. Otherwise, this function will be called without having initialized
|
||||
* memory resources! We need to be very careful in this case. Here,
|
||||
* this function will call tms570_boardinitialize() which, among other
|
||||
* things, much initialize SDRAM memory. Upon return, this function
|
||||
* will call arm_data_initialize() to initialize the memory resources
|
||||
* 4. This function will initialize all TMS570-specific resources and
|
||||
* return to __start.
|
||||
* 4. _start will then branch to os_start() to start the operating system.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void arm_boot(void)
|
||||
{
|
||||
#ifdef CONFIG_ARCH_RAMFUNCS
|
||||
const uint32_t *src;
|
||||
uint32_t *dest;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_ARCH_RAMFUNCS
|
||||
/* Copy any necessary code sections from FLASH to RAM. The correct
|
||||
* destination in SRAM is given by _sramfuncs and _eramfuncs. The
|
||||
* temporary location is in flash after the data initialization code
|
||||
* at _framfuncs
|
||||
*/
|
||||
|
||||
for (src = &_framfuncs, dest = &_sramfuncs; dest < &_eramfuncs; )
|
||||
{
|
||||
*dest++ = *src++;
|
||||
}
|
||||
|
||||
/* Flush the copied RAM functions into physical RAM so that will
|
||||
* be available when fetched into the I-Cache.
|
||||
*/
|
||||
|
||||
arch_clean_dcache((uintptr_t)&_sramfuncs, (uintptr_t)&_eramfuncs)
|
||||
#endif
|
||||
|
||||
/* Setup up vector block. _vector_start and _vector_end are exported from
|
||||
* arm_vector.S
|
||||
*/
|
||||
|
||||
tms570_copyvectorblock();
|
||||
|
||||
/* Disable the watchdog timer */
|
||||
|
||||
tms570_wdtdisable();
|
||||
|
||||
/* Initialize clocking to settings provided by board-specific logic */
|
||||
|
||||
tms570_clockconfig();
|
||||
|
||||
#ifdef CONFIG_ARCH_FPU
|
||||
/* Initialize the FPU */
|
||||
|
||||
arm_fpuconfig();
|
||||
#endif
|
||||
|
||||
/* Perform board-specific initialization, This must include:
|
||||
*
|
||||
* - Initialization of board-specific memory resources (e.g., SDRAM)
|
||||
* - Configuration of board specific resources (PIOs, LEDs, etc).
|
||||
*
|
||||
* NOTE: We must use caution prior to this point to make sure that
|
||||
* the logic does not access any global variables that might lie
|
||||
* in SDRAM.
|
||||
*/
|
||||
|
||||
tms570_boardinitialize();
|
||||
|
||||
#ifdef CONFIG_BOOT_SDRAM_DATA
|
||||
/* If .data and .bss reside in SDRAM, then initialize the data sections
|
||||
* now after SDRAM has been initialized.
|
||||
*/
|
||||
|
||||
arm_data_initialize();
|
||||
#endif
|
||||
|
||||
/* Perform common, low-level chip initialization (might do nothing) */
|
||||
|
||||
tms570_lowsetup();
|
||||
|
||||
#ifdef USE_EARLYSERIALINIT
|
||||
/* Perform early serial initialization if we are going to use the serial
|
||||
* driver.
|
||||
*/
|
||||
|
||||
tms570_earlyserialinit();
|
||||
#endif
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user