comboot.h File Reference

SYSLINUX COMBOOT. More...

#include <stdint.h>
#include <rmsetjmp.h>
#include <ipxe/in.h>

Go to the source code of this file.

Data Structures
union	com32_reg32_t
struct	com32sys_t
struct	syslinux_pm_regs
struct	syslinux_rm_regs
struct	comboot_shuffle_descriptor

Macros
#define	COMBOOT_PSP_SEG   0x07C0
	Segment used for COMBOOT PSP and image.
#define	COM32_START_PHYS   0x101000
	Entry point address of COM32 images.
#define	COM32_BOUNCE_SEG   0x07C0
	COM32 bounce buffer segment.
#define	COMBOOT_FILE_BLOCKSZ   512
	Size of SYSLINUX file block in bytes.
#define	COMBOOT_FEATURE_LOCAL_BOOT   (1 << 0)
	COMBOOT feature flags (INT 22h AX=15h)
#define	COMBOOT_FEATURE_IDLE_LOOP   (1 << 1)
#define	COMBOOT_MAX_SHUFFLE_DESCRIPTORS   682
	Maximum number of shuffle descriptors for shuffle and boot functions (INT 22h AX=0012h, 001Ah, 001Bh)
#define	COMBOOT_EXIT   1
#define	COMBOOT_EXIT_RUN_KERNEL   2
#define	COMBOOT_EXIT_COMMAND   3
#define	COMBOOT_VIDEO_GRAPHICS   0x01
#define	COMBOOT_VIDEO_NONSTANDARD   0x02
#define	COMBOOT_VIDEO_VESA   0x04
#define	COMBOOT_VIDEO_NOTEXT   0x08

Functions
	FILE_LICENCE (GPL2_OR_LATER)
void	hook_comboot_interrupts ()
	Hook BIOS interrupts related to COMBOOT API (INT 20h, 21h, 22h)
void	unhook_comboot_interrupts ()
	Unhook BIOS interrupts related to COMBOOT API (INT 20h, 21h, 22h)
void	com32_intcall_wrapper ()
void	com32_farcall_wrapper ()
void	com32_cfarcall_wrapper ()
int	comboot_resolv (const char *name, struct in_addr *address)
void	comboot_force_text_mode (void)
	Set default text mode.

Variables
rmjmp_buf	comboot_return

Detailed Description

SYSLINUX COMBOOT.

Definition in file comboot.h.

Macro Definition Documentation

COMBOOT_PSP_SEG

#define COMBOOT_PSP_SEG   0x07C0

Segment used for COMBOOT PSP and image.

Definition at line 17 of file comboot.h.

Referenced by comboot_exec_loop(), and comboot_prepare_segment().

COM32_START_PHYS

#define COM32_START_PHYS   0x101000

Entry point address of COM32 images.

Definition at line 20 of file comboot.h.

Referenced by com32_exec_loop(), and com32_load_image().

COM32_BOUNCE_SEG

#define COM32_BOUNCE_SEG   0x07C0

COM32 bounce buffer segment.

Definition at line 23 of file comboot.h.

Referenced by com32_exec_loop(), and com32_prepare_bounce_buffer().

COMBOOT_FILE_BLOCKSZ

#define COMBOOT_FILE_BLOCKSZ   512

Size of SYSLINUX file block in bytes.

Definition at line 26 of file comboot.h.

Referenced by int22().

COMBOOT_FEATURE_LOCAL_BOOT

#define COMBOOT_FEATURE_LOCAL_BOOT   (1 << 0)

COMBOOT feature flags (INT 22h AX=15h)

Definition at line 29 of file comboot.h.

COMBOOT_FEATURE_IDLE_LOOP

#define COMBOOT_FEATURE_IDLE_LOOP   (1 << 1)

Definition at line 30 of file comboot.h.

Referenced by __data16().

COMBOOT_MAX_SHUFFLE_DESCRIPTORS

#define COMBOOT_MAX_SHUFFLE_DESCRIPTORS   682

Maximum number of shuffle descriptors for shuffle and boot functions (INT 22h AX=0012h, 001Ah, 001Bh)

Definition at line 36 of file comboot.h.

Referenced by int22(), and shuffle().

COMBOOT_EXIT

#define COMBOOT_EXIT   1

Definition at line 119 of file comboot.h.

Referenced by com32_exec_loop(), comboot_exec_loop(), int20(), and int21().

COMBOOT_EXIT_RUN_KERNEL

#define COMBOOT_EXIT_RUN_KERNEL   2

Definition at line 120 of file comboot.h.

Referenced by com32_exec_loop(), comboot_exec_loop(), and int22().

COMBOOT_EXIT_COMMAND

#define COMBOOT_EXIT_COMMAND   3

Definition at line 121 of file comboot.h.

Referenced by com32_exec_loop(), comboot_exec_loop(), and int22().

COMBOOT_VIDEO_GRAPHICS

#define COMBOOT_VIDEO_GRAPHICS   0x01

Definition at line 125 of file comboot.h.

Referenced by comboot_force_text_mode().

COMBOOT_VIDEO_NONSTANDARD

#define COMBOOT_VIDEO_NONSTANDARD   0x02

Definition at line 126 of file comboot.h.

COMBOOT_VIDEO_VESA

#define COMBOOT_VIDEO_VESA   0x04

Definition at line 127 of file comboot.h.

Referenced by comboot_force_text_mode().

COMBOOT_VIDEO_NOTEXT

#define COMBOOT_VIDEO_NOTEXT   0x08

Definition at line 128 of file comboot.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER

)

hook_comboot_interrupts()

void hook_comboot_interrupts ( )

extern

Hook BIOS interrupts related to COMBOOT API (INT 20h, 21h, 22h)

Definition at line 645 of file comboot_call.c.

                                 {
 
        __asm__ __volatile__ (
                TEXT16_CODE ( "\nint20_wrapper:\n\t"
                              VIRT_CALL ( int20 )
                              "clc\n\t"
                              "call patch_cf\n\t"
                              "iret\n\t" ) : );
 
        hook_bios_interrupt ( 0x20, ( intptr_t ) int20_wrapper, &int20_vector );
 
        __asm__ __volatile__ (
                TEXT16_CODE ( "\nint21_wrapper:\n\t"
                              VIRT_CALL ( int21 )
                              "clc\n\t"
                              "call patch_cf\n\t"
                              "iret\n\t" ) : );
 
        hook_bios_interrupt ( 0x21, ( intptr_t ) int21_wrapper, &int21_vector );
 
        __asm__  __volatile__ (
                TEXT16_CODE ( "\nint22_wrapper:\n\t"
                              VIRT_CALL ( int22 )
                              "clc\n\t"
                              "call patch_cf\n\t"
                              "iret\n\t" ) : );
 
        hook_bios_interrupt ( 0x22, ( intptr_t ) int22_wrapper, &int22_vector );
}

References __asm__(), __volatile__(), hook_bios_interrupt(), int20(), int20_vector, int20_wrapper(), int21(), int21_vector, int21_wrapper(), int22(), int22_vector, int22_wrapper(), TEXT16_CODE, and VIRT_CALL.

Referenced by com32_exec_loop(), and comboot_exec_loop().

unhook_comboot_interrupts()

void unhook_comboot_interrupts ( )

extern

Unhook BIOS interrupts related to COMBOOT API (INT 20h, 21h, 22h)

Definition at line 678 of file comboot_call.c.

                                   {
 
        unhook_bios_interrupt ( 0x20, ( intptr_t ) int20_wrapper,
                                &int20_vector );
 
        unhook_bios_interrupt ( 0x21, ( intptr_t ) int21_wrapper,
                                &int21_vector );
 
        unhook_bios_interrupt ( 0x22, ( intptr_t ) int22_wrapper,
                                &int22_vector );
}

References int20_vector, int20_wrapper(), int21_vector, int21_wrapper(), int22_vector, int22_wrapper(), and unhook_bios_interrupt().

Referenced by com32_exec_loop(), and comboot_exec_loop().

com32_intcall_wrapper()

void com32_intcall_wrapper ( )

extern

Referenced by com32_exec_loop().

com32_farcall_wrapper()

void com32_farcall_wrapper ( )

extern

Referenced by com32_exec_loop().

com32_cfarcall_wrapper()

void com32_cfarcall_wrapper ( )

extern

References address, comboot_return, and name.

Referenced by com32_exec_loop().

comboot_resolv()

int comboot_resolv ( const char * name, struct in_addr * address )

extern

Definition at line 44 of file comboot_resolv.c.

                                                                 {
        int rc;
 
        comboot_resolver.rc = -EINPROGRESS;
        comboot_resolver.addr.s_addr = 0;
 
        if ( ( rc = resolv ( &comboot_resolver.intf, name, NULL ) ) != 0 )
                return rc;
 
        while ( comboot_resolver.rc == -EINPROGRESS )
                step();
 
        if ( ! comboot_resolver.addr.s_addr )
                return -EAFNOSUPPORT;
 
        *address = comboot_resolver.addr;
        return comboot_resolver.rc;
}

References comboot_resolver::addr, address, EAFNOSUPPORT, EINPROGRESS, comboot_resolver::intf, name, NULL, comboot_resolver::rc, rc, resolv(), in_addr::s_addr, and step().

Referenced by int22(), and PROVIDE_REQUIRING_SYMBOL().

comboot_force_text_mode()

void comboot_force_text_mode ( void )

extern

Set default text mode.

Definition at line 136 of file comboot_call.c.

                                      {
        if ( comboot_graphics_mode & COMBOOT_VIDEO_VESA ) {
                /* Set VGA mode 3 via VESA VBE mode set */
                __asm__ __volatile__ (
                        REAL_CODE (
                                "mov $0x4F02, %%ax\n\t"
                                "mov $0x03, %%bx\n\t"
                                "int $0x10\n\t"
                        )
                : : );
        } else if ( comboot_graphics_mode & COMBOOT_VIDEO_GRAPHICS ) {
                /* Set VGA mode 3 via standard VGA mode set */
                __asm__ __volatile__ (
                        REAL_CODE (
                                "mov $0x03, %%ax\n\t"
                                "int $0x10\n\t"
                        )
                : : );
        }
 
        comboot_graphics_mode = 0;
}

References __asm__(), __volatile__(), comboot_graphics_mode, COMBOOT_VIDEO_GRAPHICS, COMBOOT_VIDEO_VESA, and REAL_CODE.

Referenced by com32_exec_loop(), comboot_exec_loop(), and int22().

Variable Documentation

comboot_return

rmjmp_buf comboot_return

extern

Definition at line 83 of file comboot_call.c.

Referenced by com32_cfarcall_wrapper(), com32_exec_loop(), comboot_exec_loop(), int20(), int21(), and int22().