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Diffstat (limited to 'plat/common/aarch64/platform_mp_stack.S')
| -rw-r--r-- | plat/common/aarch64/platform_mp_stack.S | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/plat/common/aarch64/platform_mp_stack.S b/plat/common/aarch64/platform_mp_stack.S new file mode 100644 index 0000000..801ec7f --- /dev/null +++ b/plat/common/aarch64/platform_mp_stack.S @@ -0,0 +1,102 @@ +/* + * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 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. + * + * Neither the name of ARM 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 HOLDER 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. + */ + +#include <arch.h> +#include <asm_macros.S> +#include <platform_def.h> + + + .local pcpu_dv_mem_stack + .local platform_normal_stacks + .weak platform_set_stack + .weak platform_get_stack + .weak platform_set_coherent_stack + + + /* ----------------------------------------------------- + * void platform_set_coherent_stack (unsigned long mpidr) + * + * For a given CPU, this function sets the stack pointer + * to a stack allocated in device memory. This stack can + * be used by C code which enables/disables the SCTLR.M + * SCTLR.C bit e.g. while powering down a cpu + * ----------------------------------------------------- + */ +func platform_set_coherent_stack + mov x5, x30 // lr + get_mp_stack pcpu_dv_mem_stack, PCPU_DV_MEM_STACK_SIZE + mov sp, x0 + ret x5 + + /* ----------------------------------------------------- + * unsigned long platform_get_stack (unsigned long mpidr) + * + * For a given CPU, this function returns the stack + * pointer for a stack allocated in device memory. + * ----------------------------------------------------- + */ +func platform_get_stack + mov x10, x30 // lr + get_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE + ret x10 + + /* ----------------------------------------------------- + * void platform_set_stack (unsigned long mpidr) + * + * For a given CPU, this function sets the stack pointer + * to a stack allocated in normal memory. + * ----------------------------------------------------- + */ +func platform_set_stack + mov x9, x30 // lr + bl platform_get_stack + mov sp, x0 + ret x9 + + /* ----------------------------------------------------- + * Per-cpu stacks in normal memory. + * Used for C code during runtime execution (when coherent + * stacks are not required). + * Each cpu gets a stack of PLATFORM_STACK_SIZE bytes. + * ----------------------------------------------------- + */ +declare_stack platform_normal_stacks, tzfw_normal_stacks, \ + PLATFORM_STACK_SIZE, PLATFORM_CORE_COUNT + + /* ----------------------------------------------------- + * Per-cpu stacks in device memory. + * Used for C code just before power down or right after + * power up when the MMU or caches need to be turned on + * or off. + * Each cpu gets a stack of PCPU_DV_MEM_STACK_SIZE bytes. + * ----------------------------------------------------- + */ +declare_stack pcpu_dv_mem_stack, tzfw_coherent_mem, \ + PCPU_DV_MEM_STACK_SIZE, PLATFORM_CORE_COUNT |