854e89e162
Instead of relying on the disc data being directly mapped, and accessing blocks by memcpy'ing from it, provide op_read/op_write callbacks so that the host can do disc ops itself (e.g. access SD). The disc_descr_t describes the callbacks (and an opaque pointer passed as an argument when they are invoked), per-disc.
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/*
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* Copyright 2024 Matt Evans
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef DISC_H
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#define DISC_H
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#include <inttypes.h>
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typedef int (*disc_op_read)(void *ctx, uint8_t *data, unsigned int offset, unsigned int len);
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typedef int (*disc_op_write)(void *ctx, uint8_t *data, unsigned int offset, unsigned int len);
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typedef struct {
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uint8_t *base;
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unsigned int size;
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int read_only;
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void *op_ctx;
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disc_op_read op_read;
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disc_op_write op_write;
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} disc_descr_t;
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#define DISC_NUM_DRIVES 2
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/* Passed an array of descriptors of disc data:
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* FIXME: provide callbacks to fops->read/write etc. instead of needing
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* a flat array.
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*
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* Contents copied, pointer is not stored.
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*/
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void disc_init(disc_descr_t discs[DISC_NUM_DRIVES]);
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int disc_pv_hook(uint8_t opcode);
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#endif
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