diff options
Diffstat (limited to 'bsps/riscv/shared/start')
| -rw-r--r-- | bsps/riscv/shared/start/bspgetworkarea.c | 144 | ||||
| -rw-r--r-- | bsps/riscv/shared/start/start.S | 23 |
2 files changed, 166 insertions, 1 deletions
diff --git a/bsps/riscv/shared/start/bspgetworkarea.c b/bsps/riscv/shared/start/bspgetworkarea.c new file mode 100644 index 0000000000..d802ffea42 --- /dev/null +++ b/bsps/riscv/shared/start/bspgetworkarea.c @@ -0,0 +1,144 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @brief BSP specific initialization support routines + * + */ + +/* + * COPYRIGHT (c) 1989-2020. + * On-Line Applications Research Corporation (OAR). + * Cobham Gaisler AB. + * + * 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. + * + * 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. + */ + +#include <bsp.h> +#include <bsp/fdt.h> + +#include <rtems/sysinit.h> + +#include <libfdt.h> + +/* + * These are provided by the linkcmds for ALL of the BSPs which use this file. + */ +extern char WorkAreaBase[]; +extern char RamEnd[]; + +static Memory_Area _Memory_Areas[ 1 ]; + +static const char memory_path[] = "/memory"; + +static void* get_end_of_memory_from_fdt(void) +{ + const void *fdt; + const void *val; + int node; + int parent; + int ac; + int sc; + int len; + uintptr_t start; + uintptr_t size; + + fdt = bsp_fdt_get(); + + node = fdt_path_offset_namelen( + fdt, + memory_path, + (int) sizeof(memory_path) - 1 + ); + + if (node < 0) { + return NULL; + } + + parent = fdt_parent_offset(fdt, node); + if (parent < 0) { + return NULL; + } + + ac = fdt_address_cells(fdt, parent); + if (ac != 1 && ac != 2) { + return NULL; + } + + sc = fdt_size_cells(fdt, parent); + if (sc != 1 && sc != 2) { + return NULL; + } + + if (sc > ac) { + return NULL; + } + + val = fdt_getprop(fdt, node, "reg", &len); + if (len < sc + ac) { + return NULL; + } + + if (ac == 1) { + start = fdt32_to_cpu(((fdt32_t *)val)[0]); + size = fdt32_to_cpu(((fdt32_t *)val)[1]); + } + + if (ac == 2) { + start = fdt64_to_cpu(((fdt64_t *)val)[0]); + + if (sc == 1) + size = fdt32_to_cpu(((fdt32_t *)(val+8))[0]); + else + size = fdt64_to_cpu(((fdt64_t *)val)[1]); + } + + return (void*) (start + size); +} + +static void bsp_memory_initialize( void ) +{ + void *end; + + /* get end of memory from the "/memory" node in the fdt */ + end = get_end_of_memory_from_fdt(); + if (end == NULL) { + /* fall back to linker symbol if "/memory" node not found or invalid */ + end = RamEnd; + } + _Memory_Initialize( &_Memory_Areas[ 0 ], WorkAreaBase, end ); +} + +RTEMS_SYSINIT_ITEM( + bsp_memory_initialize, + RTEMS_SYSINIT_MEMORY, + RTEMS_SYSINIT_ORDER_MIDDLE +); + +static const Memory_Information _Memory_Information = + MEMORY_INFORMATION_INITIALIZER( _Memory_Areas ); + +const Memory_Information *_Memory_Get( void ) +{ + return &_Memory_Information; +} diff --git a/bsps/riscv/shared/start/start.S b/bsps/riscv/shared/start/start.S index 3702f8ac2f..f31d89335c 100644 --- a/bsps/riscv/shared/start/start.S +++ b/bsps/riscv/shared/start/start.S @@ -1,5 +1,5 @@ /* - * Copyright (c) 2018 embedded brains GmbH + * Copyright (c) 2018 embedded brains GmbH & Co. KG * Copyright (c) 2015 University of York. * Hesham Almatary <hesham@alumni.york.ac.uk> @@ -40,6 +40,7 @@ PUBLIC(_start) .section .bsp_start_text, "wax", @progbits .align 2 .option arch, +zicsr + .option norelax TYPE_FUNC(_start) SYM(_start): @@ -65,6 +66,17 @@ SYM(_start): LADDR sp, _ISR_Stack_area_begin LADDR t2, _ISR_Stack_size csrr s0, mhartid + li t3, RISCV_BOOT_HARTID + sub s0, s0, t3 + + /* + * Check that this is a configured processor. If not, then there is + * not much that can be done since we do not have a stack available for + * this processor. Just loop forever in this case. + */ + LREG t3, _SMP_Processor_configured_maximum + bgeu s0, t3, .Lwfi + LADDR t0, _Per_CPU_Information slli t1, s0, PER_CPU_CONTROL_SIZE_LOG2 add s1, t0, t1 @@ -97,6 +109,9 @@ SYM(_start): tail boot_card #ifdef RTEMS_SMP +.Lwfi: + wfi + j .Lwfi .Lstart_on_secondary_processor: @@ -128,9 +143,15 @@ SYM(_start): mv a0, s1 call bsp_start_on_secondary_processor + .section .bsp_start_data, "aw" + + .type .Lsecondary_processor_go, @object + #if __riscv_xlen == 32 + .size .Lsecondary_processor_go, 4 .align 2 #elif __riscv_xlen == 64 + .size .Lsecondary_processor_go, 8 .align 3 #endif |