diff options
| -rw-r--r-- | src/arch/i386/firmware/pcbios/fakee820.c | 90 | ||||
| -rw-r--r-- | src/arch/i386/firmware/pcbios/hidemem.c | 15 | ||||
| -rw-r--r-- | src/arch/i386/include/fakee820.h | 7 |
3 files changed, 112 insertions, 0 deletions
diff --git a/src/arch/i386/firmware/pcbios/fakee820.c b/src/arch/i386/firmware/pcbios/fakee820.c new file mode 100644 index 00000000..e171edfd --- /dev/null +++ b/src/arch/i386/firmware/pcbios/fakee820.c @@ -0,0 +1,90 @@ +/* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <realmode.h> +#include <biosint.h> + +/** Assembly routine in inline asm */ +extern void int15_fakee820(); + +/** Original INT 15 handler */ +static struct segoff __text16 ( real_int15_vector ); +#define real_int15_vector __use_text16 ( real_int15_vector ) + +/** An INT 15,e820 memory map entry */ +struct e820_entry { + /** Start of region */ + uint64_t start; + /** Length of region */ + uint64_t len; + /** Type of region */ + uint32_t type; +} __attribute__ (( packed )); + +#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 */ + +/** Fake e820 map */ +static struct e820_entry __text16_array ( e820map, [] ) __used = { + { 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 }, +}; +#define e820map __use_text16 ( e820map ) + +void fake_e820 ( void ) { + __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" + "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" + "clc\n\t" + "lret $2\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 ) { + unhook_bios_interrupt ( 0x15, ( unsigned int ) int15_fakee820, + &real_int15_vector ); +} diff --git a/src/arch/i386/firmware/pcbios/hidemem.c b/src/arch/i386/firmware/pcbios/hidemem.c index 202081b6..c9df7bd0 100644 --- a/src/arch/i386/firmware/pcbios/hidemem.c +++ b/src/arch/i386/firmware/pcbios/hidemem.c @@ -19,10 +19,14 @@ #include <realmode.h> #include <biosint.h> #include <basemem.h> +#include <fakee820.h> #include <gpxe/init.h> #include <gpxe/memmap.h> #include <gpxe/hidemem.h> +/** Set to true if you want to test a fake E820 map */ +#define FAKE_E820 0 + /** Alignment for hidden memory regions */ #define ALIGN_HIDDEN 4096 /* 4kB page alignment should be enough */ @@ -135,6 +139,13 @@ static void hide_etherboot ( void ) { DBG ( "Hiding gPXE from system memory map\n" ); get_memmap ( &memmap ); + /* Hook in fake E820 map, if we're testing one */ + if ( FAKE_E820 ) { + DBG ( "Hooking in fake E820 map\n" ); + fake_e820(); + get_memmap ( &memmap ); + } + /* Initialise the hidden regions */ hide_basemem(); hide_umalloc ( virt_to_phys ( _text ), virt_to_phys ( _text ) ); @@ -194,6 +205,10 @@ static void unhide_etherboot ( int flags __unused ) { */ unhook_bios_interrupt ( 0x15, ( unsigned int ) int15, &int15_vector ); + + /* Unhook fake E820 map, if used */ + if ( FAKE_E820 ) + unfake_e820(); } /** Hide Etherboot startup function */ diff --git a/src/arch/i386/include/fakee820.h b/src/arch/i386/include/fakee820.h new file mode 100644 index 00000000..f1fe8aff --- /dev/null +++ b/src/arch/i386/include/fakee820.h @@ -0,0 +1,7 @@ +#ifndef _FAKEE820_H +#define _FAKEE820_H + +extern void fake_e820 ( void ); +extern void unfake_e820 ( void ); + +#endif /* _FAKEE820_H */ |