diff options
Diffstat (limited to 'gpxe/src/arch/i386/interface/syslinux/com32_call.c')
| -rw-r--r-- | gpxe/src/arch/i386/interface/syslinux/com32_call.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/gpxe/src/arch/i386/interface/syslinux/com32_call.c b/gpxe/src/arch/i386/interface/syslinux/com32_call.c deleted file mode 100644 index d2c3f918..00000000 --- a/gpxe/src/arch/i386/interface/syslinux/com32_call.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * Copyright (C) 2008 Daniel Verkamp <daniel@drv.nu>. - * - * 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. - */ - -/** - * @file SYSLINUX COM32 helpers - * - */ - -FILE_LICENCE ( GPL2_OR_LATER ); - -#include <stdint.h> -#include <realmode.h> -#include <comboot.h> -#include <assert.h> -#include <gpxe/uaccess.h> - -static com32sys_t __bss16 ( com32_regs ); -#define com32_regs __use_data16 ( com32_regs ) - -static uint8_t __bss16 ( com32_int_vector ); -#define com32_int_vector __use_data16 ( com32_int_vector ) - -static uint32_t __bss16 ( com32_farcall_proc ); -#define com32_farcall_proc __use_data16 ( com32_farcall_proc ) - -uint16_t __bss16 ( com32_saved_sp ); - -/** - * Interrupt call helper - */ -void __asmcall com32_intcall ( uint8_t interrupt, physaddr_t inregs_phys, physaddr_t outregs_phys ) { - - memcpy_user ( virt_to_user( &com32_regs ), 0, - phys_to_user ( inregs_phys ), 0, - sizeof(com32sys_t) ); - - com32_int_vector = interrupt; - - __asm__ __volatile__ ( - REAL_CODE ( /* Save all registers */ - "pushal\n\t" - "pushw %%ds\n\t" - "pushw %%es\n\t" - "pushw %%fs\n\t" - "pushw %%gs\n\t" - /* Mask off unsafe flags */ - "movl (com32_regs + 40), %%eax\n\t" - "andl $0x200cd7, %%eax\n\t" - "movl %%eax, (com32_regs + 40)\n\t" - /* Load com32_regs into the actual registers */ - "movw %%sp, %%ss:(com32_saved_sp)\n\t" - "movw $com32_regs, %%sp\n\t" - "popw %%gs\n\t" - "popw %%fs\n\t" - "popw %%es\n\t" - "popw %%ds\n\t" - "popal\n\t" - "popfl\n\t" - "movw %%ss:(com32_saved_sp), %%sp\n\t" - /* patch INT instruction */ - "pushw %%ax\n\t" - "movb %%ss:(com32_int_vector), %%al\n\t" - "movb %%al, %%cs:(com32_intcall_instr + 1)\n\t" - /* perform a jump to avoid problems with cache - * consistency in self-modifying code on some CPUs (486) - */ - "jmp 1f\n" - "1:\n\t" - "popw %%ax\n\t" - "com32_intcall_instr:\n\t" - /* INT instruction to be patched */ - "int $0xFF\n\t" - /* Copy regs back to com32_regs */ - "movw %%sp, %%ss:(com32_saved_sp)\n\t" - "movw $(com32_regs + 44), %%sp\n\t" - "pushfl\n\t" - "pushal\n\t" - "pushw %%ds\n\t" - "pushw %%es\n\t" - "pushw %%fs\n\t" - "pushw %%gs\n\t" - "movw %%ss:(com32_saved_sp), %%sp\n\t" - /* Restore registers */ - "popw %%gs\n\t" - "popw %%fs\n\t" - "popw %%es\n\t" - "popw %%ds\n\t" - "popal\n\t") - : : ); - - if ( outregs_phys ) { - memcpy_user ( phys_to_user ( outregs_phys ), 0, - virt_to_user( &com32_regs ), 0, - sizeof(com32sys_t) ); - } -} - -/** - * Farcall helper - */ -void __asmcall com32_farcall ( uint32_t proc, physaddr_t inregs_phys, physaddr_t outregs_phys ) { - - memcpy_user ( virt_to_user( &com32_regs ), 0, - phys_to_user ( inregs_phys ), 0, - sizeof(com32sys_t) ); - - com32_farcall_proc = proc; - - __asm__ __volatile__ ( - REAL_CODE ( /* Save all registers */ - "pushal\n\t" - "pushw %%ds\n\t" - "pushw %%es\n\t" - "pushw %%fs\n\t" - "pushw %%gs\n\t" - /* Mask off unsafe flags */ - "movl (com32_regs + 40), %%eax\n\t" - "andl $0x200cd7, %%eax\n\t" - "movl %%eax, (com32_regs + 40)\n\t" - /* Load com32_regs into the actual registers */ - "movw %%sp, %%ss:(com32_saved_sp)\n\t" - "movw $com32_regs, %%sp\n\t" - "popw %%gs\n\t" - "popw %%fs\n\t" - "popw %%es\n\t" - "popw %%ds\n\t" - "popal\n\t" - "popfl\n\t" - "movw %%ss:(com32_saved_sp), %%sp\n\t" - /* Call procedure */ - "lcall *%%ss:(com32_farcall_proc)\n\t" - /* Copy regs back to com32_regs */ - "movw %%sp, %%ss:(com32_saved_sp)\n\t" - "movw $(com32_regs + 44), %%sp\n\t" - "pushfl\n\t" - "pushal\n\t" - "pushw %%ds\n\t" - "pushw %%es\n\t" - "pushw %%fs\n\t" - "pushw %%gs\n\t" - "movw %%ss:(com32_saved_sp), %%sp\n\t" - /* Restore registers */ - "popw %%gs\n\t" - "popw %%fs\n\t" - "popw %%es\n\t" - "popw %%ds\n\t" - "popal\n\t") - : : ); - - if ( outregs_phys ) { - memcpy_user ( phys_to_user ( outregs_phys ), 0, - virt_to_user( &com32_regs ), 0, - sizeof(com32sys_t) ); - } -} - -/** - * CDECL farcall helper - */ -int __asmcall com32_cfarcall ( uint32_t proc, physaddr_t stack, size_t stacksz ) { - int32_t eax; - - copy_user_to_rm_stack ( phys_to_user ( stack ), stacksz ); - com32_farcall_proc = proc; - - __asm__ __volatile__ ( - REAL_CODE ( "lcall *%%ss:(com32_farcall_proc)\n\t" ) - : "=a" (eax) - : - : "ecx", "edx" ); - - remove_user_from_rm_stack ( 0, stacksz ); - - return eax; -} |