X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fipxe%2Fsrc%2Farch%2Fi386%2Ffirmware%2Fpcbios%2Ffakee820.c;fp=qemu%2Froms%2Fipxe%2Fsrc%2Farch%2Fi386%2Ffirmware%2Fpcbios%2Ffakee820.c;h=e5f7137281c2d2588bf13529eb36dab4f1d37ad6;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git diff --git a/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/fakee820.c b/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/fakee820.c new file mode 100644 index 000000000..e5f713728 --- /dev/null +++ b/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/fakee820.c @@ -0,0 +1,94 @@ +/* Copyright (C) 2008 Michael Brown . + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include +#include + +/** 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" + "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 ) { + unhook_bios_interrupt ( 0x15, ( unsigned int ) int15_fakee820, + &real_int15_vector ); +}