43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
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// This is NEW CODE, a VM ram/disk access driver for use in the VM
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// This driver is intended to be very simple to read/write blocks.
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#ifndef _VMRD_H
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#define _VMRD_H
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#include "diskio.h"
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// The address of the first register is the same as for virtio disk but
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// the interface (to simplify kernel memory maps) but will use a
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// different magic number.
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#define VMRD_BASEADDRESS 0x0000000010001000UL
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#define VMRD_REG_MAGIC 0
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#define VMRD_REG_BLKSIZE 4
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#define VMRD_REG_MEMADDR 8
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#define VMRD_REG_BLKADDR 16
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#define VMRD_REG_ACTION 24
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// The magic number is BA5DB105
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#define VMRD_MAGIC 0xBA5DB105
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// These defines work like global variables for accessing the registers.
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#define vmrd_magic *((unsigned int*)(VMRD_BASEADDRESS + VMRD_REG_MAGIC))
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#define vmrd_blksize *((unsigned int*)(VMRD_BASEADDRESS + VMRD_REG_BLKSIZE))
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#define vmrd_memaddr *((unsigned long*)(VMRD_BASEADDRESS + VMRD_REG_MEMADDR))
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#define vmrd_blkaddr *((unsigned long*)(VMRD_BASEADDRESS + VMRD_REG_BLKADDR))
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#define vmrd_action *((unsigned int*)(VMRD_BASEADDRESS + VMRD_REG_ACTION))
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// Returns a major version number >= 1 if the virtual ram/disk device is
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// present and 0 otherwise.
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int vmrd_present();
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// Initialises vmrd, returning a non-zero value on failure (e.g. if not present)
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int vmrd_init();
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// Performs a read/write of a block.
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int vmrd_rw(diskio_buffer_t* buffer, int writing);
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// This doesn't really belong here but is used to enable/disable debug
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// tracing in the VM.
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void vmrd_settracing(int onoroff);
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// From ifndef at end of file:
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#endif
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