89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/*
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* Copyright (c) 2010 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* 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 NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <err.h>
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#include <debug.h>
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#include <platform.h>
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#include "platform_p.h"
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#include <platform/armemu.h>
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#include <lib/bio.h>
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#include <reg.h>
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static bdev_t dev;
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static uint64_t get_blkdev_len(void)
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{
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return *REG64(BDEV_LEN);
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}
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ssize_t read_block(struct bdev *dev, void *buf, bnum_t block, uint count)
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{
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/* assume args have been validated by layer above */
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*REG32(BDEV_CMD_ADDR) = (uint32_t)buf;
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*REG64(BDEV_CMD_OFF) = (uint64_t)((uint64_t)block * dev->block_size);
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*REG32(BDEV_CMD_LEN) = count * dev->block_size;
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*REG32(BDEV_CMD) = BDEV_CMD_READ;
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uint32_t err = *REG32(BDEV_CMD) & BDEV_CMD_ERRMASK;
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if (err == BDEV_CMD_ERR_NONE)
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return count * dev->block_size;
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else
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return ERR_IO;
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}
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ssize_t write_block(struct bdev *dev, const void *buf, bnum_t block, uint count)
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{
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/* assume args have been validated by layer above */
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*REG32(BDEV_CMD_ADDR) = (uint32_t)buf;
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*REG64(BDEV_CMD_OFF) = (uint64_t)((uint64_t)block * dev->block_size);
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*REG32(BDEV_CMD_LEN) = count * dev->block_size;
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*REG32(BDEV_CMD) = BDEV_CMD_WRITE;
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uint32_t err = *REG32(BDEV_CMD) & BDEV_CMD_ERRMASK;
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if (err == BDEV_CMD_ERR_NONE)
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return count * dev->block_size;
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else
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return ERR_IO;
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}
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void platform_init_blkdev(void)
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{
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if ((*REG32(SYSINFO_FEATURES) & SYSINFO_FEATURE_BLOCKDEV) == 0)
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return; // no block device
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TRACEF("device len %lld\n", get_blkdev_len());
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if (get_blkdev_len() == 0)
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return;
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bio_initialize_bdev(&dev, "block0", 512, get_blkdev_len() / 512);
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// fill in hooks
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dev.read_block = &read_block;
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dev.write_block = &write_block;
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bio_register_device(&dev);
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}
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