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#ifndef COMBOOT_H
#define COMBOOT_H
/**
* @file
*
* SYSLINUX COMBOOT
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <setjmp.h>
#include <ipxe/in.h>
/** Segment used for COMBOOT PSP and image */
#define COMBOOT_PSP_SEG 0x07C0
/** Entry point address of COM32 images */
#define COM32_START_PHYS 0x101000
/** COM32 bounce buffer segment */
#define COM32_BOUNCE_SEG 0x07C0
/** Size of SYSLINUX file block in bytes */
#define COMBOOT_FILE_BLOCKSZ 512
/** COMBOOT feature flags (INT 22h AX=15h) */
#define COMBOOT_FEATURE_LOCAL_BOOT (1 << 0)
#define COMBOOT_FEATURE_IDLE_LOOP (1 << 1)
/** Maximum number of shuffle descriptors for
* shuffle and boot functions
* (INT 22h AX=0012h, 001Ah, 001Bh)
*/
#define COMBOOT_MAX_SHUFFLE_DESCRIPTORS 682
typedef union {
uint32_t l;
uint16_t w[2];
uint8_t b[4];
} com32_reg32_t;
typedef struct {
uint16_t gs; /* Offset 0 */
uint16_t fs; /* Offset 2 */
uint16_t es; /* Offset 4 */
uint16_t ds; /* Offset 6 */
com32_reg32_t edi; /* Offset 8 */
com32_reg32_t esi; /* Offset 12 */
com32_reg32_t ebp; /* Offset 16 */
com32_reg32_t _unused_esp; /* Offset 20 */
com32_reg32_t ebx; /* Offset 24 */
com32_reg32_t edx; /* Offset 28 */
com32_reg32_t ecx; /* Offset 32 */
com32_reg32_t eax; /* Offset 36 */
com32_reg32_t eflags; /* Offset 40 */
} com32sys_t;
typedef struct {
uint32_t eax; /* Offset 0 */
uint32_t ecx; /* Offset 4 */
uint32_t edx; /* Offset 8 */
uint32_t ebx; /* Offset 12 */
uint32_t esp; /* Offset 16 */
uint32_t ebp; /* Offset 20 */
uint32_t esi; /* Offset 24 */
uint32_t edi; /* Offset 28 */
uint32_t eip; /* Offset 32 */
} syslinux_pm_regs;
typedef struct {
uint16_t es; /* Offset 0 */
uint16_t _unused_cs; /* Offset 2 */
uint16_t ds; /* Offset 4 */
uint16_t ss; /* Offset 6 */
uint16_t fs; /* Offset 8 */
uint16_t gs; /* Offset 10 */
uint32_t eax; /* Offset 12 */
uint32_t ecx; /* Offset 16 */
uint32_t edx; /* Offset 20 */
uint32_t ebx; /* Offset 24 */
uint32_t esp; /* Offset 28 */
uint32_t ebp; /* Offset 32 */
uint32_t esi; /* Offset 36 */
uint32_t edi; /* Offset 40 */
uint16_t ip; /* Offset 44 */
uint16_t cs; /* Offset 46 */
} syslinux_rm_regs;
typedef struct {
uint32_t dest;
uint32_t src;
uint32_t len;
} comboot_shuffle_descriptor;
extern void hook_comboot_interrupts ( );
extern void unhook_comboot_interrupts ( );
/* These are not the correct prototypes, but it doens't matter,
* as we only ever get the address of these functions;
* they are only called from COM32 code running in PHYS_CODE
*/
extern void com32_intcall_wrapper ( );
extern void com32_farcall_wrapper ( );
extern void com32_cfarcall_wrapper ( );
/* Resolve a hostname to an (IPv4) address */
extern int comboot_resolv ( const char *name, struct in_addr *address );
/* setjmp/longjmp context buffer used to return after loading an image */
extern rmjmp_buf comboot_return;
extern void *com32_external_esp;
#define COMBOOT_EXIT 1
#define COMBOOT_EXIT_RUN_KERNEL 2
#define COMBOOT_EXIT_COMMAND 3
extern void comboot_force_text_mode ( void );
#define COMBOOT_VIDEO_GRAPHICS 0x01
#define COMBOOT_VIDEO_NONSTANDARD 0x02
#define COMBOOT_VIDEO_VESA 0x04
#define COMBOOT_VIDEO_NOTEXT 0x08
#endif
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