03514ba605
Patch submitted by hoefnix. Ref. https://groups.google.com/d/msg/minix-dev/sHQDVJRyx1c/eJjrYOqk5bgJ Change-Id: I2fcdf4cf119ef252ccc7df06849baf37ffd08440
151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
/* Part of libhgfs - (c) 2009, D.C. van Moolenbroek */
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#include "inc.h"
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#define CMD_XFER 0x1E /* vmware backdoor transfer command */
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enum {
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XFER_OPEN, /* open transfer channel */
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XFER_SENDLEN, /* specify length of data to send */
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XFER_SEND, /* send data */
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XFER_RECVLEN, /* get length of data to receive */
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XFER_RECV, /* receive data */
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XFER_RECVACK, /* acknowledge receipt of data */
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XFER_CLOSE /* close transfer channel */
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};
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#define STATUS(p) (HIWORD((p)[2]) & 0xff)
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/*===========================================================================*
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* channel_open *
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*===========================================================================*/
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int channel_open(
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struct channel *ch, /* struct describing the new channel */
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u32_t type /* channel type: CH_IN or CH_OUT */
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)
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{
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/* Open a new backdoor channel. Upon success, the given channel structure will
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* be filled with information and can be used in subsequent channel calls.
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* Return OK on success, or a negative error code on error.
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*/
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u32_t ptr[6];
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ptr[1] = type | 0x80000000;
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ptr[2] = MAKELONG(CMD_XFER, XFER_OPEN);
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backdoor(ptr);
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if ((STATUS(ptr) & 1) == 0) return EIO;
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ch->id = HIWORD(ptr[3]);
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ch->cookie1 = ptr[4];
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ch->cookie2 = ptr[5];
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return OK;
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}
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/*===========================================================================*
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* channel_close *
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*===========================================================================*/
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void channel_close(
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struct channel *ch /* backdoor channel to close */
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)
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{
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/* Close a previously opened backdoor channel.
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*/
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u32_t ptr[6];
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ptr[2] = MAKELONG(CMD_XFER, XFER_CLOSE);
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ptr[3] = MAKELONG(0, ch->id);
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ptr[4] = ch->cookie1;
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ptr[5] = ch->cookie2;
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backdoor(ptr);
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}
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/*===========================================================================*
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* channel_send *
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*===========================================================================*/
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int channel_send(
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struct channel *ch, /* backdoor channel to send to */
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char *buf, /* buffer to send data from */
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int len /* size of the data to send */
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)
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{
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/* Receive data over a backdoor channel. Return OK on success, or a negative
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* error code on error.
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*/
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u32_t ptr[7];
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ptr[1] = len;
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ptr[2] = MAKELONG(CMD_XFER, XFER_SENDLEN);
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ptr[3] = MAKELONG(0, ch->id);
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ptr[4] = ch->cookie1;
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ptr[5] = ch->cookie2;
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backdoor(ptr);
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if ((STATUS(ptr) & 1) == 0) return EIO;
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if (len == 0) return OK;
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ptr[1] = MAKELONG(0, 1);
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ptr[2] = len;
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ptr[3] = MAKELONG(0, ch->id);
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ptr[4] = (u32_t)buf;
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ptr[5] = ch->cookie2;
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ptr[6] = ch->cookie1;
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backdoor_out(ptr);
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return OK;
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}
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/*===========================================================================*
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* channel_recv *
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*===========================================================================*/
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int channel_recv(
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struct channel *ch, /* backdoor channel to receive from */
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char *buf, /* buffer to receive data into */
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int max /* size of the buffer */
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)
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{
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/* Receive data on a backdoor channel. Return the number of bytes received, or
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* a negative error code on error.
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*/
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u32_t ptr[7];
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int len;
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ptr[2] = MAKELONG(CMD_XFER, XFER_RECVLEN);
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ptr[3] = MAKELONG(0, ch->id);
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ptr[4] = ch->cookie1;
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ptr[5] = ch->cookie2;
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backdoor(ptr);
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if ((STATUS(ptr) & 0x81) == 0) return EIO;
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if ((len = ptr[1]) == 0 || (STATUS(ptr) & 3) == 1) return 0;
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if (len > max) return E2BIG;
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ptr[1] = MAKELONG(0, 1);
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ptr[2] = len;
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ptr[3] = MAKELONG(0, ch->id);
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ptr[4] = ch->cookie1;
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ptr[5] = (u32_t)buf;
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ptr[6] = ch->cookie2;
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backdoor_in(ptr);
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ptr[1] = 1;
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ptr[2] = MAKELONG(CMD_XFER, XFER_RECVACK);
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ptr[3] = MAKELONG(0, ch->id);
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ptr[4] = ch->cookie1;
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ptr[5] = ch->cookie2;
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backdoor(ptr);
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return len;
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}
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