fakee820.c File Reference

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

Go to the source code of this file.

Data Structures
struct	e820_entry
	An INT 15,e820 memory map entry. More...
Defines
#define	real_int15_vector   __use_text16 ( real_int15_vector )
#define	E820_TYPE_RAM   1
	Normal memory.
#define	E820_TYPE_RSVD   2
	Reserved and unavailable.
#define	E820_TYPE_ACPI   3
	ACPI reclaim memory.
#define	E820_TYPE_NVS   4
	ACPI NVS memory.
#define	e820map   __use_text16 ( e820map )
Functions
	FILE_LICENCE (GPL2_OR_LATER)
void	int15_fakee820 ()
	Assembly routine in inline asm.
static struct segoff	__text16 (real_int15_vector)
	Original INT 15 handler.
static struct e820_entry	__text16_array (e820map)
	Fake e820 map.
void	fake_e820 (void)
void	unfake_e820 (void)
Variables
struct e820_entry	packed
	An INT 15,e820 memory map entry.

---

Define Documentation

#define real_int15_vector   __use_text16 ( real_int15_vector )

Definition at line 28 of file fakee820.c.

Referenced by fake_e820(), and unfake_e820().

#define E820_TYPE_RAM   1

Normal memory.

Definition at line 40 of file fakee820.c.

Referenced by __text16_array(), and meme820().

#define E820_TYPE_RSVD   2

Reserved and unavailable.

Definition at line 41 of file fakee820.c.

Referenced by __text16_array().

#define E820_TYPE_ACPI   3

ACPI reclaim memory.

Definition at line 42 of file fakee820.c.

Referenced by __text16_array().

#define E820_TYPE_NVS   4

ACPI NVS memory.

Definition at line 43 of file fakee820.c.

#define e820map   __use_text16 ( e820map )

Definition at line 57 of file fakee820.c.

Referenced by fake_e820().

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

void int15_fakee820

(

)

Assembly routine in inline asm.

Referenced by fake_e820(), and unfake_e820().

static struct segoff __text16

(

real_int15_vector

)

[static, read]

Original INT 15 handler.

static struct e820_entry __text16_array

(

e820map

)

[static, read]

Fake e820 map.

Definition at line 46 of file fakee820.c.

References E820_TYPE_ACPI, E820_TYPE_RAM, and E820_TYPE_RSVD.

                                                                 {
        { 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 },
};

void fake_e820

(

void

)

Definition at line 59 of file fakee820.c.

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

Referenced by hide_etherboot().

                        {
        __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, ( unsigned int ) int15_fakee820,
                              &real_int15_vector );
}

void unfake_e820

(

void

)

Definition at line 90 of file fakee820.c.

References int15_fakee820(), real_int15_vector, and unhook_bios_interrupt().

Referenced by unhide_etherboot().

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

---

Variable Documentation

struct e820_entry packed

An INT 15,e820 memory map entry.