72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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* Copyright (c) 2010 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <lk/err.h>
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#include <lk/debug.h>
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#include <lk/trace.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 <lk/reg.h>
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static uint64_t get_blkdev_len(void) {
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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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/* 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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/* 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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static bdev_t dev;
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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, 0, NULL,
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BIO_FLAGS_NONE);
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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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