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#ifndef _IPXE_VMWARE_H
#define _IPXE_VMWARE_H
/** @file
*
* VMware backdoor mechanism
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
/** VMware backdoor I/O port */
#define VMW_PORT 0x5658
/** VMware backdoor magic value */
#define VMW_MAGIC 0x564d5868 /* "VMXh" */
/** VMware backdoor magic instruction */
#define VMW_BACKDOOR "inl %%dx, %%eax"
/** Get VMware version */
#define VMW_CMD_GET_VERSION 0x0a
/** Issue GuestRPC command */
#define VMW_CMD_GUESTRPC 0x1e
/**
* Get VMware version
*
* @ret version VMware version(?)
* @ret magic VMware magic number, if present
* @ret product_type VMware product type
*/
static inline __attribute__ (( always_inline )) void
vmware_cmd_get_version ( uint32_t *version, uint32_t *magic,
uint32_t *product_type ) {
uint32_t discard_d;
/* Perform backdoor call */
__asm__ __volatile__ ( VMW_BACKDOOR
: "=a" ( *version ), "=b" ( *magic ),
"=c" ( *product_type ), "=d" ( discard_d )
: "0" ( VMW_MAGIC ), "1" ( 0 ),
"2" ( VMW_CMD_GET_VERSION ),
"3" ( VMW_PORT ) );
}
/**
* Issue GuestRPC command
*
* @v channel Channel number
* @v subcommand GuestRPC subcommand
* @v parameter Subcommand-specific parameter
* @ret edxhi Subcommand-specific result
* @ret ebx Subcommand-specific result
* @ret status Command status
*/
static inline __attribute__ (( always_inline )) uint32_t
vmware_cmd_guestrpc ( int channel, uint16_t subcommand, uint32_t parameter,
uint16_t *edxhi, uint32_t *ebx ) {
uint32_t discard_a;
uint32_t status;
uint32_t edx;
/* Perform backdoor call */
__asm__ __volatile__ ( VMW_BACKDOOR
: "=a" ( discard_a ), "=b" ( *ebx ),
"=c" ( status ), "=d" ( edx )
: "0" ( VMW_MAGIC ), "1" ( parameter ),
"2" ( VMW_CMD_GUESTRPC | ( subcommand << 16 )),
"3" ( VMW_PORT | ( channel << 16 ) ) );
*edxhi = ( edx >> 16 );
return status;
}
extern int vmware_present ( void );
#endif /* _IPXE_VMWARE_H */
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