Starting kyOSPi//64

My back's been in a lot of pain, but I've slowly started working on kOS//pi64.

I'm starting off by writing out a bunch of mechanical translations of register [1] addresses. They look a lot like [2]

namespace peripheral::uart {

typedef Address            UARTAddress;


volatile UARTAddress       UART0   = 0x7e201000;
// more UART base addresses


enum class Register : RegisterOffset {
        DR     = 0x00, // DR Data Register
        RSRECR = 0x04,
        FR     = 0x18, // FR Flag register
        // the rest of the registers.
};


inline Address
UARTRegisterAddress(UARTAddress uart, Register r)
{
        return uart + static_cast<RegisterOffset>(r);
}


} // namespace peripheral::uart

I do want this to be useful for some other platforms later [3], so I've added some configuration set up as well [4].

/*
 * bcm2711/config.h
 *
 * Configuration definitiosn for the BCM2711 systems.
 */


#ifndef __BCM2711_CONFIG_H__
#define __BCM2711_CONFIG_H__


typedef unsigned long Address;
typedef unsigned long AddressValue;
typedef unsigned long RegisterValue;
typedef unsigned char RegisterOffset;

#if PLATFORM == pi4
typedef unsigned char GPIOPin;
constexpr GPIOPin UART_TX = 0;
constexpr GPIOPin UART_TX = 0;
#endif


#endif// __BCM2711_CONFIG_H__

I'm thinking that the use of specific types for data and addresses might be helpful later for type-checking things.

With this basic framework, it's time to start translating GPIO pins over.

[1]Register as in data registers, not processor registers.
[2]https://git.wntrmute.dev/kyle/kospi64/src/commit/b61b0ddf34aa03c30d697da48012806e487d6c74/inc/bcm2711/peripheral/uart.h
[3]I also have a directory with the start of kOS//86, and it would be interesting to merge them.
[4]https://git.wntrmute.dev/kyle/kospi64/src/commit/b61b0ddf34aa03c30d697da48012806e487d6c74/inc/bcm2711/config.h
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