comboot.h File Reference

SYSLINUX COMBOOT. More...

#include <stdint.h>
#include <setjmp.h>
#include <gpxe/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

Defines

#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
struct image * comboot_replacement_image
void * com32_external_esp

Detailed Description

SYSLINUX COMBOOT.

Definition in file comboot.h.

Define Documentation

#define COMBOOT_PSP_SEG   0x07C0

Segment used for COMBOOT PSP and image.

Definition at line 17 of file comboot.h.

Referenced by comboot_exec(), and comboot_prepare_segment().

#define COM32_START_PHYS   0x101000

Entry point address of COM32 images.

Definition at line 20 of file comboot.h.

Referenced by com32_exec(), and comboot_load_image().

#define COM32_BOUNCE_SEG   0x07C0

COM32 bounce buffer segment.

Definition at line 23 of file comboot.h.

Referenced by com32_exec(), and comboot_prepare_bounce_buffer().

#define COMBOOT_FILE_BLOCKSZ   512

Size of SYSLINUX file block in bytes.

Definition at line 26 of file comboot.h.

Referenced by int22().

#define COMBOOT_FEATURE_LOCAL_BOOT   (1 << 0)

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

Definition at line 29 of file comboot.h.

#define COMBOOT_FEATURE_IDLE_LOOP   (1 << 1)

Definition at line 30 of file comboot.h.

#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().

#define COMBOOT_EXIT   1

Definition at line 124 of file comboot.h.

Referenced by com32_exec(), comboot_exec(), int20(), and int21().

#define COMBOOT_EXIT_RUN_KERNEL   2

Definition at line 125 of file comboot.h.

Referenced by com32_exec(), comboot_exec(), and int22().

#define COMBOOT_EXIT_COMMAND   3

Definition at line 126 of file comboot.h.

Referenced by com32_exec(), comboot_exec(), and int22().

#define COMBOOT_VIDEO_GRAPHICS   0x01

Definition at line 130 of file comboot.h.

Referenced by comboot_force_text_mode().

#define COMBOOT_VIDEO_NONSTANDARD   0x02

Definition at line 131 of file comboot.h.

#define COMBOOT_VIDEO_VESA   0x04

Definition at line 132 of file comboot.h.

Referenced by comboot_force_text_mode().

#define COMBOOT_VIDEO_NOTEXT   0x08

Definition at line 133 of file comboot.h.

Function Documentation

FILE_LICENCE ( GPL2_OR_LATER   ) 

void hook_comboot_interrupts (  ) 

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

Definition at line 664 of file comboot_call.c.

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

Referenced by com32_exec(), and comboot_exec().

00664                                  {
00665 
00666         __asm__ __volatile__ (
00667                 TEXT16_CODE ( "\nint20_wrapper:\n\t"
00668                               "pushl %0\n\t"
00669                               "pushw %%cs\n\t"
00670                               "call prot_call\n\t"
00671                               "addw $4, %%sp\n\t"
00672                               "iret\n\t" )
00673                           : : "i" ( int20 ) );
00674 
00675         hook_bios_interrupt ( 0x20, ( unsigned int ) int20_wrapper,
00676                                       &int20_vector );
00677 
00678         __asm__ __volatile__ (
00679                 TEXT16_CODE ( "\nint21_wrapper:\n\t"
00680                               "pushl %0\n\t"
00681                               "pushw %%cs\n\t"
00682                               "call prot_call\n\t"
00683                               "addw $4, %%sp\n\t"
00684                               "iret\n\t" )
00685                           : : "i" ( int21 ) );
00686 
00687         hook_bios_interrupt ( 0x21, ( unsigned int ) int21_wrapper,
00688                               &int21_vector );
00689 
00690         __asm__  __volatile__ (
00691                 TEXT16_CODE ( "\nint22_wrapper:\n\t"
00692                               "pushl %0\n\t"
00693                               "pushw %%cs\n\t"
00694                               "call prot_call\n\t"
00695                               "addw $4, %%sp\n\t"
00696                               "iret\n\t" )
00697                           : : "i" ( int22) );
00698 
00699         hook_bios_interrupt ( 0x22, ( unsigned int ) int22_wrapper,
00700                               &int22_vector );
00701 }

void unhook_comboot_interrupts (  ) 

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

Definition at line 706 of file comboot_call.c.

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

Referenced by com32_exec(), and comboot_exec().

00706                                    {
00707 
00708         unhook_bios_interrupt ( 0x20, ( unsigned int ) int20_wrapper,
00709                                 &int20_vector );
00710 
00711         unhook_bios_interrupt ( 0x21, ( unsigned int ) int21_wrapper,
00712                                 &int21_vector );
00713 
00714         unhook_bios_interrupt ( 0x22, ( unsigned int ) int22_wrapper,
00715                                 &int22_vector );
00716 }

void com32_intcall_wrapper (  ) 

Referenced by com32_exec().

void com32_farcall_wrapper (  ) 

Referenced by com32_exec().

void com32_cfarcall_wrapper (  ) 

Referenced by com32_exec().

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

Definition at line 47 of file comboot_resolv.c.

References comboot_resolv_addr, comboot_resolv_rc, EINPROGRESS, NULL, resolv(), and step().

Referenced by int22().

00047                                                                  {
00048         int rc;
00049 
00050         comboot_resolv_rc = -EINPROGRESS;
00051 
00052         if ( ( rc = resolv ( &comboot_resolver, name, NULL ) ) != 0 )
00053                 return rc;
00054 
00055         while ( comboot_resolv_rc == -EINPROGRESS )
00056                 step();
00057 
00058         *address = comboot_resolv_addr;
00059         return comboot_resolv_rc;
00060 }

void comboot_force_text_mode ( void   ) 

Set default text mode.

Definition at line 144 of file comboot_call.c.

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

Referenced by com32_exec(), comboot_exec(), and int22().

00144                                       {
00145         if ( comboot_graphics_mode & COMBOOT_VIDEO_VESA ) {
00146                 /* Set VGA mode 3 via VESA VBE mode set */
00147                 __asm__ __volatile__ (
00148                         REAL_CODE (
00149                                 "mov $0x4F02, %%ax\n\t"
00150                                 "mov $0x03, %%bx\n\t"
00151                                 "int $0x10\n\t"
00152                         )
00153                 : : );
00154         } else if ( comboot_graphics_mode & COMBOOT_VIDEO_GRAPHICS ) {
00155                 /* Set VGA mode 3 via standard VGA mode set */
00156                 __asm__ __volatile__ (
00157                         REAL_CODE (
00158                                 "mov $0x03, %%ax\n\t"
00159                                 "int $0x10\n\t"
00160                         )
00161                 : : );
00162         }
00163 
00164         comboot_graphics_mode = 0;
00165 }

Variable Documentation

rmjmp_buf comboot_return

Definition at line 82 of file comboot_call.c.

Referenced by com32_exec(), and comboot_exec().

struct image* comboot_replacement_image

Definition at line 85 of file comboot_call.c.

Referenced by com32_exec(), and comboot_exec().

void* com32_external_esp

Referenced by com32_exec().

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