diff options
Diffstat (limited to 'plat/common/aarch32/platform_mp_stack.S')
-rw-r--r-- | plat/common/aarch32/platform_mp_stack.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/plat/common/aarch32/platform_mp_stack.S b/plat/common/aarch32/platform_mp_stack.S new file mode 100644 index 000000000..c4ea89584 --- /dev/null +++ b/plat/common/aarch32/platform_mp_stack.S @@ -0,0 +1,80 @@ +/* + * Copyright (c) 2018, Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#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 r9, lr + get_mp_stack pcpu_dv_mem_stack, PCPU_DV_MEM_STACK_SIZE + mov sp, r0 + bx r9 +endfunc platform_set_coherent_stack + + /* ----------------------------------------------------- + * uintptr_t platform_get_stack (u_register_t mpidr) + * + * For a given CPU, this function returns the stack + * pointer for a stack allocated in normal memory. + * ----------------------------------------------------- + */ +func platform_get_stack + mov r9, lr + get_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE + bx r9 +endfunc platform_get_stack + + /* ----------------------------------------------------- + * void platform_set_stack (u_register_t mpidr) + * + * For a given CPU, this function sets the stack + * pointer to a stack allocated in normal memory. + * ----------------------------------------------------- + */ +func platform_set_stack + mov r9, lr + get_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE + mov sp, r0 + bx r9 +endfunc platform_set_stack + + /* ----------------------------------------------------- + * 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, tftf_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, tftf_coherent_stacks, \ + PCPU_DV_MEM_STACK_SIZE, PLATFORM_CORE_COUNT |