#include <realmode.h>
#include <biosint.h>

Data Structures
struct	e820_entry
	An INT 15,e820 memory map entry. More...

Macros
#define	real_int15_vector __use_text16 ( real_int15_vector )

#define	E820_TYPE_RAM 1
	Normal memory. More...

#define	E820_TYPE_RSVD 2
	Reserved and unavailable. More...

#define	E820_TYPE_ACPI 3
	ACPI reclaim memory. More...

#define	E820_TYPE_NVS 4
	ACPI NVS memory. More...

#define	e820map __use_text16 ( e820map )

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)

void	int15_fakee820 ()
	Assembly routine in inline asm. More...

static struct segoff	__text16 (real_int15_vector)
	Original INT 15 handler. More...

struct e820_entry	__attribute__ ((packed))

static struct e820_entry	__text16_array (e820map)
	Fake e820 map. More...

void	fake_e820 (void)

void	unfake_e820 (void)

Variables
uint64_t	start
	Start of region. More...

uint64_t	len
	Length of region. More...

uint32_t	type
	Type of region. More...

Macro Definition Documentation

◆ real_int15_vector

#define real_int15_vector __use_text16 ( real_int15_vector )

Definition at line 33 of file fakee820.c.

◆ E820_TYPE_RAM

#define E820_TYPE_RAM 1

Normal memory.

Definition at line 45 of file fakee820.c.

◆ E820_TYPE_RSVD

#define E820_TYPE_RSVD 2

Reserved and unavailable.

Definition at line 46 of file fakee820.c.

◆ E820_TYPE_ACPI

#define E820_TYPE_ACPI 3

ACPI reclaim memory.

Definition at line 47 of file fakee820.c.

◆ E820_TYPE_NVS

#define E820_TYPE_NVS 4

ACPI NVS memory.

Definition at line 48 of file fakee820.c.

◆ e820map

#define e820map __use_text16 ( e820map )

Definition at line 62 of file fakee820.c.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )

◆ int15_fakee820()

void int15_fakee820 ( )

Assembly routine in inline asm.

Referenced by fake_e820(), and unfake_e820().

◆ __text16()

static struct segoff __text16 ( real_int15_vector )

static

Original INT 15 handler.

◆ attribute()

struct e820_entry __attribute__ ( (packed) )

◆ __text16_array()

static struct e820_entry __text16_array ( e820map )

static

Fake e820 map.

Definition at line 51 of file fakee820.c.

                                                                  {
         { 0x00000000ULL, ( 0x000a0000ULL - 0x00000000ULL ), E820_TYPE_RAM },
         { 0x00100000ULL, ( 0xcfb50000ULL - 0x00100000ULL ), E820_TYPE_RAM },
         { 0xcfb50000ULL, ( 0xcfb64000ULL - 0xcfb50000ULL ), E820_TYPE_RSVD },
         { 0xcfb64000ULL, ( 0xcfb66000ULL - 0xcfb64000ULL ), E820_TYPE_RSVD },
         { 0xcfb66000ULL, ( 0xcfb85c00ULL - 0xcfb66000ULL ), E820_TYPE_ACPI },
         { 0xcfb85c00ULL, ( 0xd0000000ULL - 0xcfb85c00ULL ), E820_TYPE_RSVD },
         { 0xe0000000ULL, ( 0xf0000000ULL - 0xe0000000ULL ), E820_TYPE_RSVD },
         { 0xfe000000ULL, (0x100000000ULL - 0xfe000000ULL ), E820_TYPE_RSVD },
         {0x100000000ULL, (0x230000000ULL -0x100000000ULL ), E820_TYPE_RAM },
 };

References E820_TYPE_ACPI, E820_TYPE_RAM, and E820_TYPE_RSVD.

◆ fake_e820()

void fake_e820 ( void )

Definition at line 64 of file fakee820.c.

                         {
         __asm__ __volatile__ (
                 TEXT16_CODE ( "\nint15_fakee820:\n\t"
                               "pushfw\n\t"
                               "cmpl $0xe820, %%eax\n\t"
                               "jne 99f\n\t"
                               "cmpl $0x534d4150, %%edx\n\t"
                               "jne 99f\n\t"
                               "pushaw\n\t"
                               "movw %%sp, %%bp\n\t"
                               "andb $~0x01, 22(%%bp)\n\t" /* Clear return CF */
                               "leaw e820map(%%bx), %%si\n\t"
                               "cs rep movsb\n\t"
                               "popaw\n\t"
                               "movl %%edx, %%eax\n\t"
                               "addl $20, %%ebx\n\t"
                               "cmpl %0, %%ebx\n\t"
                               "jne 1f\n\t"
                               "xorl %%ebx,%%ebx\n\t"
                               "\n1:\n\t"
                               "popfw\n\t"
                               "iret\n\t"
                               "\n99:\n\t"
                               "popfw\n\t"
                               "ljmp *%%cs:real_int15_vector\n\t" )
                 : : "i" ( sizeof ( e820map ) ) );
 
         hook_bios_interrupt ( 0x15, ( intptr_t ) int15_fakee820,
                               &real_int15_vector );
 }

References __asm__(), __volatile__(), e820map, hook_bios_interrupt(), int15_fakee820(), real_int15_vector, and TEXT16_CODE.

Referenced by hide_etherboot().

◆ unfake_e820()

void unfake_e820 ( void )

Definition at line 95 of file fakee820.c.

                           {
         unhook_bios_interrupt ( 0x15, ( intptr_t ) int15_fakee820,
                                 &real_int15_vector );
 }