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rtds2gpu: update register type to work for more complex payloads

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This commit is contained in:
Daniel Krebs 2018-07-26 16:49:06 +02:00
parent c44aedd6a9
commit b2698c8bd5
1 changed files with 20 additions and 4 deletions
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24
fpga/include/villas/fpga/ips/rtds2gpu/register_types.hpp
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@ -3,6 +3,7 @@
#include <stdint.h>
#include <cstddef>
#include <cstdint>
union axilite_reg_status_t {
uint32_t value;
@ -26,16 +27,31 @@ union reg_doorbell_t {
count : 6,
is_valid : 1;
};
constexpr reg_doorbell_t() : value(0) {}
};
template<size_t N, typename T = uint32_t>
struct Rtds2GpuMemoryBuffer {
static constexpr size_t valueCount = N;
static constexpr size_t dataOffset = offsetof(Rtds2GpuMemoryBuffer, data);
static constexpr size_t doorbellOffset = offsetof(Rtds2GpuMemoryBuffer, doorbell);
// this type is only for memory interpretation, it makes no sense to create
// an instance so it's forbidden
Rtds2GpuMemoryBuffer() = delete;
// T can be a more complex type that wraps multiple values
static constexpr size_t rawValueCount = N * (sizeof(T) / 4);
// As of C++14, offsetof() is not working for non-standard layout types (i.e.
// composed of non-POD members). This might work in C++17 though.
// More info: https://gist.github.com/graphitemaster/494f21190bb2c63c5516
//static constexpr size_t doorbellOffset = offsetof(Rtds2GpuMemoryBuffer, doorbell);
//static constexpr size_t dataOffset = offsetof(Rtds2GpuMemoryBuffer, data);
// HACK: This might break horribly, let's just hope C++17 will be there soon
static constexpr size_t dataOffset = 0;
static constexpr size_t doorbellOffset = N * sizeof(Rtds2GpuMemoryBuffer::data);
T data[N];
reg_doorbell_t doorbell;
} __attribute__((packed));
};
#endif // REGISTER_TYPES_H