ipc.h

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/*
 * Copyright (c) 2023, 2024 Adrian "asie" Siekierka
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#ifndef NILE_IPC_H_
#define NILE_IPC_H_
 
#include <wonderful.h>
 
#define NILE_IPC_MAGIC 0xAA55
 
#ifndef __ASSEMBLER__
 
#include <stdbool.h>
#include <stdint.h>
 
#define NILE_IPC_TF_BLOCK 0x80
#define NILE_IPC_TF_TYPE(v) ((v) & 0x7F)
#define NILE_IPC_TF_TYPE_MMC_OLD 0x01
#define NILE_IPC_TF_TYPE_MMC_NEW 0x02
#define NILE_IPC_TF_TYPE_TF_OLD  0x04
#define NILE_IPC_TF_TYPE_TF_NEW  0x08
#define NILE_IPC_TF_TYPE_MMC     0x03
#define NILE_IPC_TF_TYPE_TF      0x0C

#define NILE_IPC_BOOT_FFFF_0000 0
#define NILE_IPC_BOOT_4000_0000 1
#define NILE_IPC_BOOT_4000_0010 2
 
typedef struct __attribute__((packed)) {
    uint16_t magic;
    uint8_t tf_card_status;
    uint8_t boot_entrypoint;
    uint8_t reserved_1[4];
    union {
        struct {
            uint16_t ax, bx, cx, dx;
            uint16_t sp, bp, si, di;
            uint16_t ds, es, ss, flags;
        };
        uint16_t data[12];
    } boot_regs;
    uint8_t boot_io[0xB8];
    uint8_t reserved_2[8];
 
    uint8_t user_area[288];
} nile_ipc_t;
 
#if __STDC_VERSION__ >= 201112L
_Static_assert(sizeof(nile_ipc_t) == 512, "nile_ipc_t size not equal to 512");
#endif
 
#define MEM_NILE_IPC ((nile_ipc_t __far*) MK_FP(0x1000, 0x0000))
 
#endif /* __ASSEMBLER__ */
 
#endif /* NILE_IPC_H_ */