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Diffstat (limited to 'c/src/lib/libbsp/arm/raspberrypi/startup/bspsmp_api.c')
-rw-r--r-- | c/src/lib/libbsp/arm/raspberrypi/startup/bspsmp_api.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/raspberrypi/startup/bspsmp_api.c b/c/src/lib/libbsp/arm/raspberrypi/startup/bspsmp_api.c new file mode 100644 index 0000000000..c3e5451442 --- /dev/null +++ b/c/src/lib/libbsp/arm/raspberrypi/startup/bspsmp_api.c @@ -0,0 +1,83 @@ +/** + * @file + * + * @ingroup raspberrypi + * + * @brief Raspberry pi SMP management functions provided to SuperCore + */ + +/* + * Copyright (c) 2016 Pavel Pisa <pisa@cmp.felk.cvut.cz> + * + * Czech Technical University in Prague + * Zikova 1903/4 + * 166 36 Praha 6 + * Czech Republic + * + * Reuses some ideas from Rohini Kulkarni <krohini1593@gmail.com> + * GSoC 2015 project and Altera Cyclone-V SMP code + * by embedded brains GmbH + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <rtems/score/smpimpl.h> + +#include <bsp/start.h> +#include <bsp/raspberrypi.h> +#include <bsp.h> +#include <bsp/arm-cp15-start.h> +#include <libcpu/arm-cp15.h> +#include <rtems.h> +#include <bsp/irq-generic.h> +#include <assert.h> + +bool _CPU_SMP_Start_processor( uint32_t cpu_index ) +{ + bool started; + uint32_t cpu_index_self = _SMP_Get_current_processor(); + + if (cpu_index != cpu_index_self) { + + BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + 0x10 * cpu_index) = (uint32_t)_start; + + /* + * Wait for secondary processor to complete its basic initialization so + * that we can enable the unified L2 cache. + */ + started = _Per_CPU_State_wait_for_non_initial_state(cpu_index, 0); + } else { + started = false; + } + + return started; +} + +uint32_t _CPU_SMP_Initialize(void) +{ + uint32_t cpu_count = (uint32_t)bsp_processor_count; + + if ( cpu_count > 4 ) + cpu_count = 4; + + return cpu_count; +} + +void _CPU_SMP_Finalize_initialization( uint32_t cpu_count ) +{ + /* Do nothing */ +} + +void _CPU_SMP_Prepare_start_multitasking( void ) +{ + /* Do nothing */ +} + +void _CPU_SMP_Send_interrupt( uint32_t target_cpu_index ) +{ + /* Generates IPI */ + BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + + 0x10 * target_cpu_index) = 0x1; +} |