6 * VMware backdoor mechanism
10 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
14 /** VMware backdoor I/O port */
15 #define VMW_PORT 0x5658
17 /** VMware backdoor magic value */
18 #define VMW_MAGIC 0x564d5868 /* "VMXh" */
20 /** VMware backdoor magic instruction */
21 #define VMW_BACKDOOR "inl %%dx, %%eax"
23 /** Get VMware version */
24 #define VMW_CMD_GET_VERSION 0x0a
26 /** Issue GuestRPC command */
27 #define VMW_CMD_GUESTRPC 0x1e
32 * @ret version VMware version(?)
33 * @ret magic VMware magic number, if present
34 * @ret product_type VMware product type
36 static inline __attribute__ (( always_inline )) void
37 vmware_cmd_get_version ( uint32_t *version, uint32_t *magic,
38 uint32_t *product_type ) {
41 /* Perform backdoor call */
42 __asm__ __volatile__ ( VMW_BACKDOOR
43 : "=a" ( *version ), "=b" ( *magic ),
44 "=c" ( *product_type ), "=d" ( discard_d )
45 : "0" ( VMW_MAGIC ), "1" ( 0 ),
46 "2" ( VMW_CMD_GET_VERSION ),
51 * Issue GuestRPC command
53 * @v channel Channel number
54 * @v subcommand GuestRPC subcommand
55 * @v parameter Subcommand-specific parameter
56 * @ret edxhi Subcommand-specific result
57 * @ret ebx Subcommand-specific result
58 * @ret status Command status
60 static inline __attribute__ (( always_inline )) uint32_t
61 vmware_cmd_guestrpc ( int channel, uint16_t subcommand, uint32_t parameter,
62 uint16_t *edxhi, uint32_t *ebx ) {
67 /* Perform backdoor call */
68 __asm__ __volatile__ ( VMW_BACKDOOR
69 : "=a" ( discard_a ), "=b" ( *ebx ),
70 "=c" ( status ), "=d" ( edx )
71 : "0" ( VMW_MAGIC ), "1" ( parameter ),
72 "2" ( VMW_CMD_GUESTRPC | ( subcommand << 16 )),
73 "3" ( VMW_PORT | ( channel << 16 ) ) );
74 *edxhi = ( edx >> 16 );
79 extern int vmware_present ( void );
81 #endif /* _IPXE_VMWARE_H */