z2ram.rar

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  • 2015-05-12 13:50
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z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space as a block device, to be used as a RAM disk or swap space.
z2ram.rar
  • z2ram.c
    9.1KB
内容介绍
/* ** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space ** as a block device, to be used as a RAM disk or swap space ** ** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de) ** ** ++Geert: support for zorro_unused_z2ram, better range checking ** ++roman: translate accesses via an array ** ++Milan: support for ChipRAM usage ** ++yambo: converted to 2.0 kernel ** ++yambo: modularized and support added for 3 minor devices including: ** MAJOR MINOR DESCRIPTION ** ----- ----- ---------------------------------------------- ** 37 0 Use Zorro II and Chip ram ** 37 1 Use only Zorro II ram ** 37 2 Use only Chip ram ** 37 4-7 Use memory list entry 1-4 (first is 0) ** ++jskov: support for 1-4th memory list entry. ** ** Permission to use, copy, modify, and distribute this software and its ** documentation for any purpose and without fee is hereby granted, provided ** that the above copyright notice appear in all copies and that both that ** copyright notice and this permission notice appear in supporting ** documentation. This software is provided "as is" without express or ** implied warranty. */ #define DEVICE_NAME "Z2RAM" #include <linux/major.h> #include <linux/vmalloc.h> #include <linux/init.h> #include <linux/module.h> #include <linux/blkdev.h> #include <linux/bitops.h> #include <linux/mutex.h> #include <linux/slab.h> #include <asm/setup.h rel='nofollow' onclick='return false;'> #include <asm/amigahw.h rel='nofollow' onclick='return false;'> #include <asm/pgtable.h rel='nofollow' onclick='return false;'> #include <linux/zorro.h> #define Z2MINOR_COMBINED (0) #define Z2MINOR_Z2ONLY (1) #define Z2MINOR_CHIPONLY (2) #define Z2MINOR_MEMLIST1 (4) #define Z2MINOR_MEMLIST2 (5) #define Z2MINOR_MEMLIST3 (6) #define Z2MINOR_MEMLIST4 (7) #define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */ #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 ) static DEFINE_MUTEX(z2ram_mutex); static u_long *z2ram_map = NULL; static u_long z2ram_size = 0; static int z2_count = 0; static int chip_count = 0; static int list_count = 0; static int current_device = -1; static DEFINE_SPINLOCK(z2ram_lock); static struct gendisk *z2ram_gendisk; static void do_z2_request(struct request_queue *q) { struct request *req; req = blk_fetch_request(q); while (req) { unsigned long start = blk_rq_pos(req) << 9; unsigned long len = blk_rq_cur_bytes(req); int err = 0; if (start + len > z2ram_size) { pr_err(DEVICE_NAME ": bad access: block=%llu, " "count=%u\n", (unsigned long long)blk_rq_pos(req), blk_rq_cur_sectors(req)); err = -EIO; goto done; } while (len) { unsigned long addr = start & Z2RAM_CHUNKMASK; unsigned long size = Z2RAM_CHUNKSIZE - addr; void *buffer = bio_data(req->bio); if (len < size) size = len; addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ]; if (rq_data_dir(req) == READ) memcpy(buffer, (char *)addr, size); else memcpy((char *)addr, buffer, size); start += size; len -= size; } done: if (!__blk_end_request_cur(req, err)) req = blk_fetch_request(q); } } static void get_z2ram( void ) { int i; for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ ) { if ( test_bit( i, zorro_unused_z2ram ) ) { z2_count++; z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) + (i << Z2RAM_CHUNKSHIFT); clear_bit( i, zorro_unused_z2ram ); } } return; } static void get_chipram( void ) { while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) ) { chip_count++; z2ram_map[ z2ram_size ] = (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" ); if ( z2ram_map[ z2ram_size ] == 0 ) { break; } z2ram_size++; } return; } static int z2_open(struct block_device *bdev, fmode_t mode) { int device; int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) * sizeof( z2ram_map[0] ); int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) * sizeof( z2ram_map[0] ); int rc = -ENOMEM; device = MINOR(bdev->bd_dev); mutex_lock(&z2ram_mutex); if ( current_device != -1 && current_device != device ) { rc = -EBUSY; goto err_out; } if ( current_device == -1 ) { z2_count = 0; chip_count = 0; list_count = 0; z2ram_size = 0; /* Use a specific list entry. */ if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { int index = device - Z2MINOR_MEMLIST1 + 1; unsigned long size, paddr, vaddr; if (index >= m68k_realnum_memory) { printk( KERN_ERR DEVICE_NAME ": no such entry in z2ram_map\n" ); goto err_out; } paddr = m68k_memory[index].addr; size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1); #ifdef __powerpc__ /* FIXME: ioremap doesn't build correct memory tables. */ { vfree(vmalloc (size)); } vaddr = (unsigned long) __ioremap (paddr, size, _PAGE_WRITETHRU); #else vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size); #endif z2ram_map = kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]), GFP_KERNEL); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } while (size) { z2ram_map[ z2ram_size++ ] = vaddr; size -= Z2RAM_CHUNKSIZE; vaddr += Z2RAM_CHUNKSIZE; list_count++; } if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK List Entry %d Memory\n", list_count * Z2RAM_CHUNK1024, index ); } else switch ( device ) { case Z2MINOR_COMBINED: z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL ); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } get_z2ram(); get_chipram(); if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", z2_count * Z2RAM_CHUNK1024, chip_count * Z2RAM_CHUNK1024, ( z2_count + chip_count ) * Z2RAM_CHUNK1024 ); break; case Z2MINOR_Z2ONLY: z2ram_map = kmalloc( max_z2_map, GFP_KERNEL ); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } get_z2ram(); if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK of Zorro II RAM\n", z2_count * Z2RAM_CHUNK1024 ); break; case Z2MINOR_CHIPONLY: z2ram_map = kmalloc( max_chip_map, GFP_KERNEL ); if ( z2ram_map == NULL ) { printk( KERN_ERR DEVICE_NAME ": cannot get mem for z2ram_map\n" ); goto err_out; } get_chipram(); if ( z2ram_size != 0 ) printk( KERN_INFO DEVICE_NAME ": using %iK Chip RAM\n", chip_count * Z2RAM_CHUNK1024 ); break; default: rc = -ENODEV; goto err_out; break; } if ( z2ram_size == 0 ) { printk( KERN_NOTICE DEVICE_NAME ": no unused ZII/Chip RAM found\n" ); goto err_out_kfree; } current_device = device; z2ram_size <<= Z2RAM_CHUNKSHIFT; set_capacity(z2ram_gendisk, z2ram_size >> 9); } mutex_unlock(&z2ram_mutex); return 0; err_out_kfree: kfree(z2ram_map); err_out: mutex_unlock(&z2ram_mutex); return rc; } static void z2_release(struct gendisk *disk, fmode_t mode) { mutex_lock(&z2ram_mutex); if ( current_device == -1 ) { mutex_unlock(&z2ram_mutex); return; } mutex_unlock(&z2ram_mutex); /* * FIXME: unmap memory */ } static const struct block_device_operations z2_fops = { .owner = THIS_MODULE, .open = z2_open, .release = z2_release, }; static struct kobject *z2_find(dev_t dev, int *part, void *data) { *part = 0; return get_disk(z2ram_gendisk); } static struct request_queue *z2_queue; static int __init z2_init(void) { int ret; if (!MACH_IS_AMIGA) return -ENODEV; ret = -EBUSY; if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME
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