/*
 *	Copyright (c) 2024 Scott Duensing, scott@kangaroopunch.com
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *	SOFTWARE.
 */


#ifndef KERNEL_H
#define KERNEL_H


#ifdef __cplusplus
extern "C"
{
#endif


#include "f256.h"


#define kernelNextEvent()     ({ kernelEventData.type = 0;  kernelCall(NextEvent); })
#define kernelEvent(member)   (size_t)(&((struct events *)0)->member)
#define kernelVector(member)  (size_t)(&((struct call *)0xff00)->member)
#define kernelCall(fn) \
({ char ret; asm( \
                    "jsr %[addy] \n" \
                    "sta (%[ret])  \n" \
                    "lda #0        \n" \
                    "ror a         \n" \
                    "sta (%[err])  \n" \
                    : [err] "=m"(kernelError), [ret] "=m"(ret) \
                    : [addy] "i"(kernelVector(fn)) \
                    : "a", "c", "v"); \
                ret; })
/*
asm (
	".text\n"
	".global kernelwrapper\n"
	"kernelwrapper: \n"
	"   jsr 1f      \n"
	"   tax         \n"
	"   lda #0      \n"
	"   ror a       \n"
	"   sta (__rs2) \n"
	"   txa         \n"
	"   rts         \n"
	"1: jmp (__rs1) \n"
	);
unsigned char kernelwrapper(void *vector, char *error);
#define kernelCall(fn) kernelwrapper((void*)kernelVector(fn), &kernelError)
*/


typedef struct event_t   kernelEventT;
typedef struct call_args kernelArgsT;


extern kernelEventT kernelEventData;
extern kernelArgsT *kernelArgs;
extern char         kernelReturn;
extern char         kernelError;


byte kernelGetPending(void);
void kernelReset(void);


#ifdef __cplusplus
}
#endif


#endif // KERNEL_H