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#ifndef TALLER_AVALON_IMPL_HPP
#define TALLER_AVALON_IMPL_HPP
#include <cassert>
#include <cstdio>
namespace taller::avalon
{
template<class Platform>
inline interconnect<Platform>::interconnect(Platform &plat) noexcept
: plat(plat)
{}
template<class Platform>
void interconnect<Platform>::attach(slave &dev)
{
auto base = dev.base_address();
auto mask = dev.address_mask();
assert((base & mask) == base);
devices.push_back(binding { base, mask, dev });
}
template<class Platform>
void interconnect<Platform>::attach_intc(interrupt_controller &intc)
{
assert(root_intc == nullptr);
attach(intc.as_slave());
root_intc = &intc;
}
template<class Platform>
bool interconnect<Platform>::tick(bool clk) noexcept
{
if (!plat.reset_reset_n) {
active = nullptr;
plat.avl_irq = 0;
avl_read = false;
avl_write = false;
avl_address = 0;
avl_byteenable = 0;
return true;
}
if (active) {
assert(avl_address == plat.avl_address);
assert(avl_read == plat.avl_read);
assert(avl_write == plat.avl_write);
assert(avl_writedata == plat.avl_writedata);
assert(avl_byteenable == plat.avl_byteenable);
}
if (!clk) {
tick_falling();
return true;
} else if (!active)
assert(!avl_read || !avl_write);
try {
tick_rising();
return true;
} catch (const avl_bus_error&) {
return false;
}
}
template<class Platform>
void interconnect<Platform>::tick_rising()
{
for (auto &binding : devices)
binding.dev.tick();
if (root_intc)
plat.avl_irq = root_intc->irq();
if (!active) {
avl_address = plat.avl_address;
avl_read = plat.avl_read;
avl_write = plat.avl_write;
avl_writedata = plat.avl_writedata;
avl_byteenable = plat.avl_byteenable;
if (!avl_read && !avl_write)
return;
for (auto &binding : devices)
if ((avl_address & binding.mask) == binding.base) {
active = &binding.dev;
break;
}
if (!active) [[unlikely]] {
bail();
const char *op = avl_read ? "read" : "write";
fprintf(stderr, "[avl] attempt to %s memory hole at 0x%08x\n", op, avl_address);
throw avl_bus_error{"memory hole addressed"};
} else if(avl_address & 0b1111) [[unlikely]] {
bail();
fprintf(stderr, "[avl] unaligned address: 0x%08x\n", avl_address);
throw avl_bus_error{"unaligned address"};
}
}
auto pos = (avl_address & ~active->address_mask()) >> 4;
if (avl_read) {
line readdata;
plat.avl_waitrequest = !active->read_line(pos, readdata, avl_byteenable);
plat.avl_readdata = readdata;
} else if (avl_write)
plat.avl_waitrequest = !active->write_line(pos, avl_writedata, avl_byteenable);
}
template<class Platform>
void interconnect<Platform>::tick_falling() noexcept
{
if (!plat.avl_waitrequest)
active = nullptr;
}
template<class Platform>
void interconnect<Platform>::bail() noexcept
{
for (auto &binding : devices)
binding.dev.bail();
}
template<class Platform>
bool interconnect<Platform>::dump(std::uint32_t addr, std::uint32_t &word)
{
std::uint32_t avl_address = addr << 2;
auto *dev = resolve_external(avl_address);
if (!dev)
return false;
auto pos = (avl_address & ~dev->address_mask()) >> dev->word_bits();
while (!dev->read(pos, word))
continue;
return true;
}
template<class Platform>
bool interconnect<Platform>::patch(std::uint32_t addr, std::uint32_t writedata)
{
std::uint32_t avl_address = addr << 2;
auto *dev = resolve_external(avl_address);
if (!dev)
return false;
auto pos = (avl_address & ~dev->address_mask()) >> dev->word_bits();
while (!dev->write(pos, writedata, 0b1111))
continue;
return true;
}
template<class Platform>
slave* interconnect<Platform>::resolve_external(std::uint32_t avl_address)
{
for (auto &binding : devices)
if ((avl_address & binding.mask) == binding.base)
return &binding.dev;
fprintf(stderr, "[avl] attempt to access hole at 0x%08x\n", avl_address);
return nullptr;
}
}
#endif
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