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#ifndef TALLER_AVALON_HPP
#define TALLER_AVALON_HPP
#include <cassert>
#include <cstdint>
#include <cstdio>
#include <stdexcept>
#include <vector>
namespace taller::avalon
{
class slave
{
public:
inline slave(std::uint32_t base, std::uint32_t size, std::size_t word_size) noexcept
: base(base),
mask(~(size - 1)),
word(log2i(word_size))
{
assert(!((word_size - 1) & word_size));
assert(!(base & word_mask()) && !(size & word_mask()) && !((size - 1) & size));
}
inline std::uint32_t base_address() noexcept
{
return base;
}
inline std::uint32_t address_mask() noexcept
{
return mask;
}
inline std::uint32_t word_mask() noexcept
{
return (1 << word) - 1;
}
inline std::size_t word_size() noexcept
{
return 1 << word;
}
inline unsigned word_bits() noexcept
{
return word;
}
inline std::uint32_t address_span() noexcept
{
return ~mask + 1;
}
inline virtual void tick() noexcept
{}
inline virtual void bail() noexcept
{}
virtual bool read(std::uint32_t addr, std::uint32_t &data) = 0;
virtual bool write(std::uint32_t addr, std::uint32_t data, unsigned byte_enable) = 0;
inline virtual bool irq() noexcept
{
return false;
}
private:
std::uint32_t base;
std::uint32_t mask;
unsigned word;
static inline int log2i(int i)
{
return sizeof(int) * 8 - __builtin_clz(i) - 1;
}
};
struct irq_lines
{
slave *timer = nullptr;
slave *jtaguart = nullptr;
};
class interrupt_controller : private slave
{
public:
interrupt_controller(std::uint32_t base) noexcept;
virtual bool read(std::uint32_t addr, std::uint32_t &data) noexcept final override;
virtual bool write(std::uint32_t addr, std::uint32_t data, unsigned byte_enable) noexcept final override;
virtual bool irq() noexcept final override;
inline slave &as_slave() noexcept
{
return *this;
}
inline irq_lines &lines() noexcept
{
return irqs;
}
private:
irq_lines irqs;
std::uint32_t mask = 0;
std::uint32_t status() noexcept;
};
class avl_bus_error : public std::runtime_error
{
public:
using std::runtime_error::runtime_error;
};
template<class Platform>
class interconnect
{
public:
interconnect(Platform &plat) noexcept;
bool tick(bool clk) noexcept;
void tick_rising();
void tick_falling() noexcept;
void attach(slave &dev);
void attach_intc(interrupt_controller &intc);
void bail() noexcept;
bool dump(std::uint32_t addr, std::uint32_t &word);
bool patch(std::uint32_t addr, std::uint32_t readdata);
private:
struct binding
{
std::uint32_t base;
std::uint32_t mask;
slave &dev;
};
Platform &plat;
slave* active = nullptr;
std::vector<binding> devices;
interrupt_controller *root_intc = nullptr;
std::uint32_t avl_address = 0;
std::uint32_t avl_writedata = 0;
unsigned avl_byteenable = 0;
bool avl_read = false;
bool avl_write = false;
slave *resolve_external(std::uint32_t avl_address);
};
}
#include "avalon.impl.hpp"
#endif
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