--- /dev/null
+/*
+ * Copyright © 2016 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "util/u_math.h" /* for MAX2/MIN2 */
+#include "util/u_debug.h"
+#include "util/u_memory.h"
+#include "util/u_string.h"
+#include "pipe/p_defines.h"
+#include "svga_msg.h"
+
+
+#define MESSAGE_STATUS_SUCCESS 0x0001
+#define MESSAGE_STATUS_DORECV 0x0002
+#define MESSAGE_STATUS_CPT 0x0010
+#define MESSAGE_STATUS_HB 0x0080
+
+#define RPCI_PROTOCOL_NUM 0x49435052
+#define GUESTMSG_FLAG_COOKIE 0x80000000
+
+#define RETRIES 3
+
+#define VMW_HYPERVISOR_MAGIC 0x564D5868
+#define VMW_HYPERVISOR_PORT 0x5658
+#define VMW_HYPERVISOR_HB_PORT 0x5659
+
+#define VMW_PORT_CMD_MSG 30
+#define VMW_PORT_CMD_HB_MSG 0
+#define VMW_PORT_CMD_OPEN_CHANNEL (MSG_TYPE_OPEN << 16 | VMW_PORT_CMD_MSG)
+#define VMW_PORT_CMD_CLOSE_CHANNEL (MSG_TYPE_CLOSE << 16 | VMW_PORT_CMD_MSG)
+#define VMW_PORT_CMD_SENDSIZE (MSG_TYPE_SENDSIZE << 16 | VMW_PORT_CMD_MSG)
+#define VMW_PORT_CMD_RECVSIZE (MSG_TYPE_RECVSIZE << 16 | VMW_PORT_CMD_MSG)
+#define VMW_PORT_CMD_RECVSTATUS (MSG_TYPE_RECVSTATUS << 16 | VMW_PORT_CMD_MSG)
+
+#define HIGH_WORD(X) ((X & 0xFFFF0000) >> 16)
+
+
+/**
+ * Hypervisor-specific bi-directional communication channel. Should never
+ * execute on bare metal hardware. The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * The last two parameters are both input and output and must be initialized.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in_bx: [IN] Message Len, through BX
+ * @in_si: [IN] Input argument through SI, set to 0 if not used
+ * @in_di: [IN] Input argument through DI, set ot 0 if not used
+ * @port_num: [IN] port number + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @ax: [OUT] value of AX register
+ * @bx: [OUT] e.g. status from an HB message status command
+ * @cx: [OUT] e.g. status from a non-HB message status command
+ * @dx: [OUT] e.g. channel id
+ * @si: [OUT]
+ * @di: [OUT]
+ */
+#define VMW_PORT(cmd, in_bx, in_si, in_di, \
+ port_num, magic, \
+ ax, bx, cx, dx, si, di) \
+({ \
+ asm volatile ("inl %%dx, %%eax;" : \
+ "=a"(ax), \
+ "=b"(bx), \
+ "=c"(cx), \
+ "=d"(dx), \
+ "=S"(si), \
+ "=D"(di) : \
+ "a"(magic), \
+ "b"(in_bx), \
+ "c"(cmd), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di) : \
+ "memory"); \
+})
+
+
+/**
+ * Hypervisor-specific bi-directional communication channel. Should never
+ * execute on bare metal hardware. The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in_cx: [IN] Message Len, through CX
+ * @in_si: [IN] Input argument through SI, set to 0 if not used
+ * @in_di: [IN] Input argument through DI, set to 0 if not used
+ * @port_num: [IN] port number + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @bp: [IN]
+ * @ax: [OUT] value of AX register
+ * @bx: [OUT] e.g. status from an HB message status command
+ * @cx: [OUT] e.g. status from a non-HB message status command
+ * @dx: [OUT] e.g. channel id
+ * @si: [OUT]
+ * @di: [OUT]
+ */
+#ifdef __x86_64__
+
+typedef uint64_t VMW_REG;
+
+#define VMW_PORT_HB_OUT(cmd, in_cx, in_si, in_di, \
+ port_num, magic, bp, \
+ ax, bx, cx, dx, si, di) \
+({ \
+ asm volatile ("push %%rbp;" \
+ "movq %12, %%rbp;" \
+ "rep outsb;" \
+ "pop %%rbp;" : \
+ "=a"(ax), \
+ "=b"(bx), \
+ "=c"(cx), \
+ "=d"(dx), \
+ "=S"(si), \
+ "=D"(di) : \
+ "a"(magic), \
+ "b"(cmd), \
+ "c"(in_cx), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di), \
+ "r"(bp) : \
+ "memory", "cc"); \
+})
+
+#define VMW_PORT_HB_IN(cmd, in_cx, in_si, in_di, \
+ port_num, magic, bp, \
+ ax, bx, cx, dx, si, di) \
+({ \
+ asm volatile ("push %%rbp;" \
+ "movq %12, %%rbp;" \
+ "rep insb;" \
+ "pop %%rbp" : \
+ "=a"(ax), \
+ "=b"(bx), \
+ "=c"(cx), \
+ "=d"(dx), \
+ "=S"(si), \
+ "=D"(di) : \
+ "a"(magic), \
+ "b"(cmd), \
+ "c"(in_cx), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di), \
+ "r"(bp) : \
+ "memory", "cc"); \
+})
+
+#else
+
+typedef uint32_t VMW_REG;
+
+/* In the 32-bit version of this macro, we use "m" because there is no
+ * more register left for bp
+ */
+#define VMW_PORT_HB_OUT(cmd, in_cx, in_si, in_di, \
+ port_num, magic, bp, \
+ ax, bx, cx, dx, si, di) \
+({ \
+ asm volatile ("push %%ebp;" \
+ "mov %12, %%ebp;" \
+ "rep outsb;" \
+ "pop %%ebp;" : \
+ "=a"(ax), \
+ "=b"(bx), \
+ "=c"(cx), \
+ "=d"(dx), \
+ "=S"(si), \
+ "=D"(di) : \
+ "a"(magic), \
+ "b"(cmd), \
+ "c"(in_cx), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di), \
+ "m"(bp) : \
+ "memory", "cc"); \
+})
+
+
+#define VMW_PORT_HB_IN(cmd, in_cx, in_si, in_di, \
+ port_num, magic, bp, \
+ ax, bx, cx, dx, si, di) \
+({ \
+ asm volatile ("push %%ebp;" \
+ "mov %12, %%ebp;" \
+ "rep insb;" \
+ "pop %%ebp" : \
+ "=a"(ax), \
+ "=b"(bx), \
+ "=c"(cx), \
+ "=d"(dx), \
+ "=S"(si), \
+ "=D"(di) : \
+ "a"(magic), \
+ "b"(cmd), \
+ "c"(in_cx), \
+ "d"(port_num), \
+ "S"(in_si), \
+ "D"(in_di), \
+ "m"(bp) : \
+ "memory", "cc"); \
+})
+#endif /* #if __x86_64__ */
+
+
+enum rpc_msg_type {
+ MSG_TYPE_OPEN,
+ MSG_TYPE_SENDSIZE,
+ MSG_TYPE_SENDPAYLOAD,
+ MSG_TYPE_RECVSIZE,
+ MSG_TYPE_RECVPAYLOAD,
+ MSG_TYPE_RECVSTATUS,
+ MSG_TYPE_CLOSE,
+};
+
+struct rpc_channel {
+ uint16_t channel_id;
+ uint32_t cookie_high;
+ uint32_t cookie_low;
+};
+
+
+
+/**
+ * svga_open_channel
+ *
+ * @channel: RPC channel
+ * @protocol:
+ *
+ * Returns: PIPE_OK on success, PIPE_ERROR otherwise
+ */
+static enum pipe_error
+svga_open_channel(struct rpc_channel *channel, unsigned protocol)
+{
+ VMW_REG ax, bx, cx, dx, si = 0, di = 0;
+
+ VMW_PORT(VMW_PORT_CMD_OPEN_CHANNEL,
+ (protocol | GUESTMSG_FLAG_COOKIE), si, di,
+ VMW_HYPERVISOR_PORT,
+ VMW_HYPERVISOR_MAGIC,
+ ax, bx, cx, dx, si, di);
+
+ if ((HIGH_WORD(cx) & MESSAGE_STATUS_SUCCESS) == 0)
+ return PIPE_ERROR;
+
+ channel->channel_id = HIGH_WORD(dx);
+ channel->cookie_high = si;
+ channel->cookie_low = di;
+
+ return PIPE_OK;
+}
+
+
+
+/**
+ * svga_close_channel
+ *
+ * @channel: RPC channel
+ *
+ * Returns: PIPE_OK on success, PIPE_ERROR otherwises
+ */
+static enum pipe_error
+svga_close_channel(struct rpc_channel *channel)
+{
+ VMW_REG ax, bx, cx, dx, si, di;
+
+ /* Set up additional parameters */
+ si = channel->cookie_high;
+ di = channel->cookie_low;
+
+ VMW_PORT(VMW_PORT_CMD_CLOSE_CHANNEL,
+ 0, si, di,
+ (VMW_HYPERVISOR_PORT | (channel->channel_id << 16)),
+ VMW_HYPERVISOR_MAGIC,
+ ax, bx, cx, dx, si, di);
+
+ if ((HIGH_WORD(cx) & MESSAGE_STATUS_SUCCESS) == 0)
+ return PIPE_ERROR;
+
+ return PIPE_OK;
+}
+
+
+
+/**
+ * svga_send_msg: Sends a message to the host
+ *
+ * @channel: RPC channel
+ * @logmsg: NULL terminated string
+ *
+ * Returns: PIPE_OK on success
+ */
+static enum pipe_error
+svga_send_msg(struct rpc_channel *channel, const char *msg)
+{
+ VMW_REG ax, bx, cx, dx, si, di, bp;
+ size_t msg_len = strlen(msg);
+ int retries = 0;
+
+
+ while (retries < RETRIES) {
+ retries++;
+
+ /* Set up additional parameters */
+ si = channel->cookie_high;
+ di = channel->cookie_low;
+
+ VMW_PORT(VMW_PORT_CMD_SENDSIZE,
+ msg_len, si, di,
+ VMW_HYPERVISOR_PORT | (channel->channel_id << 16),
+ VMW_HYPERVISOR_MAGIC,
+ ax, bx, cx, dx, si, di);
+
+ if ((HIGH_WORD(cx) & MESSAGE_STATUS_SUCCESS) == 0 ||
+ (HIGH_WORD(cx) & MESSAGE_STATUS_HB) == 0) {
+ /* Expected success + high-bandwidth. Give up. */
+ return PIPE_ERROR;
+ }
+
+ /* Send msg */
+ si = (uintptr_t) msg;
+ di = channel->cookie_low;
+ bp = channel->cookie_high;
+
+ VMW_PORT_HB_OUT(
+ (MESSAGE_STATUS_SUCCESS << 16) | VMW_PORT_CMD_HB_MSG,
+ msg_len, si, di,
+ VMW_HYPERVISOR_HB_PORT | (channel->channel_id << 16),
+ VMW_HYPERVISOR_MAGIC, bp,
+ ax, bx, cx, dx, si, di);
+
+ if ((HIGH_WORD(bx) & MESSAGE_STATUS_SUCCESS) != 0) {
+ return PIPE_OK;
+ } else if ((HIGH_WORD(bx) & MESSAGE_STATUS_CPT) != 0) {
+ /* A checkpoint occurred. Retry. */
+ continue;
+ } else {
+ break;
+ }
+ }
+
+ return PIPE_ERROR;
+}
+
+
+
+/**
+ * svga_host_log: Sends a log message to the host
+ *
+ * @log: NULL terminated string
+ *
+ * Returns: PIPE_OK on success
+ */
+enum pipe_error
+svga_host_log(const char *log)
+{
+ struct rpc_channel channel;
+ char *msg;
+ int msg_len;
+ enum pipe_error ret = PIPE_OK;
+
+
+ if (!log)
+ return ret;
+
+ msg_len = strlen(log) + strlen("log ") + 1;
+ msg = CALLOC(1, msg_len);
+ if (msg == NULL) {
+ debug_printf("Cannot allocate memory for log message\n");
+ return PIPE_ERROR_OUT_OF_MEMORY;
+ }
+
+ util_sprintf(msg, "log %s", log);
+
+ if (svga_open_channel(&channel, RPCI_PROTOCOL_NUM) ||
+ svga_send_msg(&channel, msg) ||
+ svga_close_channel(&channel)) {
+ debug_printf("Failed to send log\n");
+
+ ret = PIPE_ERROR;
+ }
+
+ FREE(msg);
+
+ return ret;
+}
+
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