92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
// ramdisk.cpp
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// Author: Josh Holtrop
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// Date: 08/20/04
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// Modified: 05/11/05
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extern "C"
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{
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#include "functions.h"
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#include "mm/vmm.h"
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#include "lang/lang.h"
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}
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#include "block/ramdisk.h"
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#include "devices.h"
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ramdisk_t *ramdisks[256];
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minor_t ramdisk_new(u32_t size)
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{
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int i;
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for (i = 0; i < 256; i++)
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{
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if (!ramdisks[i])
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{
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void *start;
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if (( start = kmalloc(size) ))
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{
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ramdisks[i] = (ramdisk_t *)New(ramdisk_t);
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ramdisks[i]->start = start;
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ramdisks[i]->size = size;
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return i;
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}
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return -2;
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}
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}
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return -1;
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}
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minor_t ramdisk_register(void *ramdisk, u32_t size)
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{
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int i;
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for (i = 0; i < 256; i++)
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{
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if (!ramdisks[i])
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{
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ramdisks[i] = (ramdisk_t *)New(ramdisk_t);
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ramdisks[i]->start = ramdisk;
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ramdisks[i]->size = size;
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return i;
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}
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}
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return -1;
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}
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int ramdisk_remove(minor_t minor)
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{
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if (ramdisks[minor])
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{
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kfree(ramdisks[minor]->start);
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kfree(ramdisks[minor]);
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ramdisks[minor] = NULL;
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return 0;
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}
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return -1;
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}
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int Ramdisk::block_read(minor_t minor, u32_t blockStart, u32_t blocks, void *buffer)
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{
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if (!ramdisks[minor])
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return -1;
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if ((blockStart << BLOCK_SIZE_LOG) >= ramdisks[minor]->size)
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return -2;
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void *rdAddr = (void *)((u32_t)ramdisks[minor]->start + (blockStart << BLOCK_SIZE_LOG));
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u32_t copyLen = min(blocks << BLOCK_SIZE_LOG, ramdisks[minor]->size + (u32_t)ramdisks[minor]->start - (u32_t)rdAddr);
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memcpyd(buffer, rdAddr, copyLen >> 2);
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return copyLen;
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}
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int Ramdisk::block_write(minor_t minor, u32_t blockStart, u32_t blocks, void *buffer)
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{
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if (!ramdisks[minor])
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return -1;
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if ((blockStart << BLOCK_SIZE_LOG) >= ramdisks[minor]->size)
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return -2;
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void *rdAddr = (void *)((u32_t)ramdisks[minor]->start + (blockStart << BLOCK_SIZE_LOG));
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u32_t copyLen = min(blocks << BLOCK_SIZE_LOG, ramdisks[minor]->size + (u32_t)ramdisks[minor]->start - (u32_t)rdAddr);
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memcpyd(rdAddr, buffer, copyLen >> 2);
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return copyLen;
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}
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