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Diffstat (limited to 'c/src/exec/score/cpu/i386/cpu_asm.s')
| -rw-r--r-- | c/src/exec/score/cpu/i386/cpu_asm.s | 654 |
1 files changed, 0 insertions, 654 deletions
diff --git a/c/src/exec/score/cpu/i386/cpu_asm.s b/c/src/exec/score/cpu/i386/cpu_asm.s deleted file mode 100644 index 121b4409d9..0000000000 --- a/c/src/exec/score/cpu/i386/cpu_asm.s +++ /dev/null @@ -1,654 +0,0 @@ -/* cpu_asm.s - * - * This file contains all assembly code for the Intel i386 implementation - * of RTEMS. - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - -#include <asm.h> - -/* - * Format of i386 Register structure - */ - -.set REG_EFLAGS, 0 -.set REG_ESP, REG_EFLAGS + 4 -.set REG_EBP, REG_ESP + 4 -.set REG_EBX, REG_EBP + 4 -.set REG_ESI, REG_EBX + 4 -.set REG_EDI, REG_ESI + 4 -.set SIZE_REGS, REG_EDI + 4 - - BEGIN_CODE - -/* - * void _CPU_Context_switch( run_context, heir_context ) - * - * This routine performs a normal non-FP context. - */ - - .align 2 - PUBLIC (_CPU_Context_switch) - -.set RUNCONTEXT_ARG, 4 # save context argument -.set HEIRCONTEXT_ARG, 8 # restore context argument - -SYM (_CPU_Context_switch): - movl RUNCONTEXT_ARG(esp),eax # eax = running threads context - pushf # push eflags - popl REG_EFLAGS(eax) # save eflags - movl esp,REG_ESP(eax) # save stack pointer - movl ebp,REG_EBP(eax) # save base pointer - movl ebx,REG_EBX(eax) # save ebx - movl esi,REG_ESI(eax) # save source register - movl edi,REG_EDI(eax) # save destination register - - movl HEIRCONTEXT_ARG(esp),eax # eax = heir threads context - -restore: - pushl REG_EFLAGS(eax) # push eflags - popf # restore eflags - movl REG_ESP(eax),esp # restore stack pointer - movl REG_EBP(eax),ebp # restore base pointer - movl REG_EBX(eax),ebx # restore ebx - movl REG_ESI(eax),esi # restore source register - movl REG_EDI(eax),edi # restore destination register - ret - -/* - * NOTE: May be unnecessary to reload some registers. - */ - -/* - * void _CPU_Context_restore( new_context ) - * - * This routine performs a normal non-FP context. - */ - - PUBLIC (_CPU_Context_restore) - -.set NEWCONTEXT_ARG, 4 # context to restore argument - -SYM (_CPU_Context_restore): - - movl NEWCONTEXT_ARG(esp),eax # eax = running threads context - jmp restore - -/*PAGE - * void _CPU_Context_save_fp_context( &fp_context_ptr ) - * void _CPU_Context_restore_fp_context( &fp_context_ptr ) - * - * This section is used to context switch an i80287, i80387, - * the built-in coprocessor or the i80486 or compatible. - */ - -.set FPCONTEXT_ARG, 4 # FP context argument - - .align 2 - PUBLIC (_CPU_Context_save_fp) -SYM (_CPU_Context_save_fp): - movl FPCONTEXT_ARG(esp),eax # eax = &ptr to FP context area - movl (eax),eax # eax = FP context area - fsave (eax) # save FP context - ret - - .align 2 - PUBLIC (_CPU_Context_restore_fp) -SYM (_CPU_Context_restore_fp): - movl FPCONTEXT_ARG(esp),eax # eax = &ptr to FP context area - movl (eax),eax # eax = FP context area - frstor (eax) # restore FP context - ret - -/*PAGE - * void _ISR_Handler() - * - * This routine provides the RTEMS interrupt management. - * - * NOTE: - * Upon entry, the stack will contain a stack frame back to the - * interrupted task. If dispatching is enabled, this is the - * outer most interrupt, and (a context switch is necessary or - * the current task has signals), then set up the stack to - * transfer control to the interrupt dispatcher. - */ - -.set SET_SEGMENT_REGISTERS_IN_INTERRUPT, 0 - -.set SAVED_REGS , 32 # space consumed by saved regs -.set EIP_OFFSET , SAVED_REGS # offset of tasks eip -.set CS_OFFSET , EIP_OFFSET+4 # offset of tasks code segment -.set EFLAGS_OFFSET , CS_OFFSET+4 # offset of tasks eflags - - .align 2 - PUBLIC (_ISR_Handler) - -SYM (_ISR_Handler): - /* - * Before this was point is reached the vectors unique - * entry point did the following: - * - * 1. saved all registers with a "pusha" - * 2. put the vector number in eax. - * - * BEGINNING OF ESTABLISH SEGMENTS - * - * WARNING: If an interrupt can occur when the segments are - * not correct, then this is where we should establish - * the segments. In addition to establishing the - * segments, it may be necessary to establish a stack - * in the current data area on the outermost interrupt. - * - * NOTE: If the previous values of the segment registers are - * pushed, do not forget to adjust SAVED_REGS. - * - * NOTE: Make sure the exit code which restores these - * when this type of code is needed. - */ - - /***** ESTABLISH SEGMENTS CODE GOES HERE ******/ - - /* - * END OF ESTABLISH SEGMENTS - */ - - /* - * Now switch stacks if necessary - */ - - movl esp, edx # edx = previous stack pointer - cmpl $0, SYM (_ISR_Nest_level) # is this the outermost interrupt? - jne nested # No, then continue - movl SYM (_CPU_Interrupt_stack_high), esp - - /* - * We want to insure that the old stack pointer is on the - * stack we will be on at the end of the ISR when we restore it. - * By saving it on every interrupt, all we have to do is pop it - * near the end of every interrupt. - */ - -nested: - pushl edx # save the previous stack pointer - incl SYM (_ISR_Nest_level) # one nest level deeper - incl SYM (_Thread_Dispatch_disable_level) # disable multitasking - - # EAX is preloaded with the vector number. - push eax # push vector number - mov SYM (_ISR_Vector_table) (,eax,4),eax - # eax = Users handler - call eax # invoke user ISR - pop eax # eax = vector number - - decl SYM (_ISR_Nest_level) # one less ISR nest level - # If interrupts are nested, - # then dispatching is disabled - - decl SYM (_Thread_Dispatch_disable_level) - # unnest multitasking - # Is dispatch disabled - jne exit # Yes, then exit - - cmpl $0, SYM (_Context_Switch_necessary) - # Is task switch necessary? - jne bframe # Yes, then build stack - - cmpl $0, SYM (_ISR_Signals_to_thread_executing) - # signals sent to Run_thread - # while in interrupt handler? - je exit # No, exit - -bframe: - cli # DISABLE INTERRUPTS!! - popl esp # restore the stack pointer - movl $0, SYM (_ISR_Signals_to_thread_executing) - # push the isf for Isr_dispatch - push EFLAGS_OFFSET(esp) # push tasks eflags - push cs # cs of Isr_dispatch - push $ SYM (_ISR_Dispatch) # entry point - iret - -exit: - cli # DISABLE INTERRUPTS!! - popl esp # restore the stack pointer - - /* - * BEGINNING OF DE-ESTABLISH SEGMENTS - * - * NOTE: Make sure there is code here if code is added to - * load the segment registers. - * - */ - - /******* DE-ESTABLISH SEGMENTS CODE GOES HERE ********/ - - /* - * END OF DE-ESTABLISH SEGMENTS - */ - - popa # restore general registers - iret - -/*PAGE - * Distinct Interrupt Entry Points - * - * The following macro and the 256 instantiations of the macro - * are necessary to determine which interrupt vector occurred. - * The following macro allows a unique entry point to be defined - * for each vector. - * - * NOTE: There are not spaces around the vector number argument - * to the DISTINCT_INTERRUPT_ENTRY macro because m4 will - * undesirably generate the symbol "_Isr_handler_ N" - * instead of "_Isr_handler_N" like we want. - */ - -#define DISTINCT_INTERRUPT_ENTRY(_vector) \ - .align 16 ; \ - PUBLIC (_ISR_Handler_ ## _vector ) ; \ -SYM (_ISR_Handler_ ## _vector ): \ - pusha ; \ - xor eax, eax ; \ - movb $ ## _vector, al ; \ - jmp SYM (_ISR_Handler) ; - -DISTINCT_INTERRUPT_ENTRY(0) -DISTINCT_INTERRUPT_ENTRY(1) -DISTINCT_INTERRUPT_ENTRY(2) -DISTINCT_INTERRUPT_ENTRY(3) -DISTINCT_INTERRUPT_ENTRY(4) -DISTINCT_INTERRUPT_ENTRY(5) -DISTINCT_INTERRUPT_ENTRY(6) -DISTINCT_INTERRUPT_ENTRY(7) -DISTINCT_INTERRUPT_ENTRY(8) -DISTINCT_INTERRUPT_ENTRY(9) -DISTINCT_INTERRUPT_ENTRY(10) -DISTINCT_INTERRUPT_ENTRY(11) -DISTINCT_INTERRUPT_ENTRY(12) -DISTINCT_INTERRUPT_ENTRY(13) -DISTINCT_INTERRUPT_ENTRY(14) -DISTINCT_INTERRUPT_ENTRY(15) -DISTINCT_INTERRUPT_ENTRY(16) -DISTINCT_INTERRUPT_ENTRY(17) -DISTINCT_INTERRUPT_ENTRY(18) -DISTINCT_INTERRUPT_ENTRY(19) -DISTINCT_INTERRUPT_ENTRY(20) -DISTINCT_INTERRUPT_ENTRY(21) -DISTINCT_INTERRUPT_ENTRY(22) -DISTINCT_INTERRUPT_ENTRY(23) -DISTINCT_INTERRUPT_ENTRY(24) -DISTINCT_INTERRUPT_ENTRY(25) -DISTINCT_INTERRUPT_ENTRY(26) -DISTINCT_INTERRUPT_ENTRY(27) -DISTINCT_INTERRUPT_ENTRY(28) -DISTINCT_INTERRUPT_ENTRY(29) -DISTINCT_INTERRUPT_ENTRY(30) -DISTINCT_INTERRUPT_ENTRY(31) -DISTINCT_INTERRUPT_ENTRY(32) -DISTINCT_INTERRUPT_ENTRY(33) -DISTINCT_INTERRUPT_ENTRY(34) -DISTINCT_INTERRUPT_ENTRY(35) -DISTINCT_INTERRUPT_ENTRY(36) -DISTINCT_INTERRUPT_ENTRY(37) -DISTINCT_INTERRUPT_ENTRY(38) -DISTINCT_INTERRUPT_ENTRY(39) -DISTINCT_INTERRUPT_ENTRY(40) -DISTINCT_INTERRUPT_ENTRY(41) -DISTINCT_INTERRUPT_ENTRY(42) -DISTINCT_INTERRUPT_ENTRY(43) -DISTINCT_INTERRUPT_ENTRY(44) -DISTINCT_INTERRUPT_ENTRY(45) -DISTINCT_INTERRUPT_ENTRY(46) -DISTINCT_INTERRUPT_ENTRY(47) -DISTINCT_INTERRUPT_ENTRY(48) -DISTINCT_INTERRUPT_ENTRY(49) -DISTINCT_INTERRUPT_ENTRY(50) -DISTINCT_INTERRUPT_ENTRY(51) -DISTINCT_INTERRUPT_ENTRY(52) -DISTINCT_INTERRUPT_ENTRY(53) -DISTINCT_INTERRUPT_ENTRY(54) -DISTINCT_INTERRUPT_ENTRY(55) -DISTINCT_INTERRUPT_ENTRY(56) -DISTINCT_INTERRUPT_ENTRY(57) -DISTINCT_INTERRUPT_ENTRY(58) -DISTINCT_INTERRUPT_ENTRY(59) -DISTINCT_INTERRUPT_ENTRY(60) -DISTINCT_INTERRUPT_ENTRY(61) -DISTINCT_INTERRUPT_ENTRY(62) -DISTINCT_INTERRUPT_ENTRY(63) -DISTINCT_INTERRUPT_ENTRY(64) -DISTINCT_INTERRUPT_ENTRY(65) -DISTINCT_INTERRUPT_ENTRY(66) -DISTINCT_INTERRUPT_ENTRY(67) -DISTINCT_INTERRUPT_ENTRY(68) -DISTINCT_INTERRUPT_ENTRY(69) -DISTINCT_INTERRUPT_ENTRY(70) -DISTINCT_INTERRUPT_ENTRY(71) -DISTINCT_INTERRUPT_ENTRY(72) -DISTINCT_INTERRUPT_ENTRY(73) -DISTINCT_INTERRUPT_ENTRY(74) -DISTINCT_INTERRUPT_ENTRY(75) -DISTINCT_INTERRUPT_ENTRY(76) -DISTINCT_INTERRUPT_ENTRY(77) -DISTINCT_INTERRUPT_ENTRY(78) -DISTINCT_INTERRUPT_ENTRY(79) -DISTINCT_INTERRUPT_ENTRY(80) -DISTINCT_INTERRUPT_ENTRY(81) -DISTINCT_INTERRUPT_ENTRY(82) -DISTINCT_INTERRUPT_ENTRY(83) -DISTINCT_INTERRUPT_ENTRY(84) -DISTINCT_INTERRUPT_ENTRY(85) -DISTINCT_INTERRUPT_ENTRY(86) -DISTINCT_INTERRUPT_ENTRY(87) -DISTINCT_INTERRUPT_ENTRY(88) -DISTINCT_INTERRUPT_ENTRY(89) -DISTINCT_INTERRUPT_ENTRY(90) -DISTINCT_INTERRUPT_ENTRY(91) -DISTINCT_INTERRUPT_ENTRY(92) -DISTINCT_INTERRUPT_ENTRY(93) -DISTINCT_INTERRUPT_ENTRY(94) -DISTINCT_INTERRUPT_ENTRY(95) -DISTINCT_INTERRUPT_ENTRY(96) -DISTINCT_INTERRUPT_ENTRY(97) -DISTINCT_INTERRUPT_ENTRY(98) -DISTINCT_INTERRUPT_ENTRY(99) -DISTINCT_INTERRUPT_ENTRY(100) -DISTINCT_INTERRUPT_ENTRY(101) -DISTINCT_INTERRUPT_ENTRY(102) -DISTINCT_INTERRUPT_ENTRY(103) -DISTINCT_INTERRUPT_ENTRY(104) -DISTINCT_INTERRUPT_ENTRY(105) -DISTINCT_INTERRUPT_ENTRY(106) -DISTINCT_INTERRUPT_ENTRY(107) -DISTINCT_INTERRUPT_ENTRY(108) -DISTINCT_INTERRUPT_ENTRY(109) -DISTINCT_INTERRUPT_ENTRY(110) -DISTINCT_INTERRUPT_ENTRY(111) -DISTINCT_INTERRUPT_ENTRY(112) -DISTINCT_INTERRUPT_ENTRY(113) -DISTINCT_INTERRUPT_ENTRY(114) -DISTINCT_INTERRUPT_ENTRY(115) -DISTINCT_INTERRUPT_ENTRY(116) -DISTINCT_INTERRUPT_ENTRY(117) -DISTINCT_INTERRUPT_ENTRY(118) -DISTINCT_INTERRUPT_ENTRY(119) -DISTINCT_INTERRUPT_ENTRY(120) -DISTINCT_INTERRUPT_ENTRY(121) -DISTINCT_INTERRUPT_ENTRY(122) -DISTINCT_INTERRUPT_ENTRY(123) 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-DISTINCT_INTERRUPT_ENTRY(156) -DISTINCT_INTERRUPT_ENTRY(157) -DISTINCT_INTERRUPT_ENTRY(158) -DISTINCT_INTERRUPT_ENTRY(159) -DISTINCT_INTERRUPT_ENTRY(160) -DISTINCT_INTERRUPT_ENTRY(161) -DISTINCT_INTERRUPT_ENTRY(162) -DISTINCT_INTERRUPT_ENTRY(163) -DISTINCT_INTERRUPT_ENTRY(164) -DISTINCT_INTERRUPT_ENTRY(165) -DISTINCT_INTERRUPT_ENTRY(166) -DISTINCT_INTERRUPT_ENTRY(167) -DISTINCT_INTERRUPT_ENTRY(168) -DISTINCT_INTERRUPT_ENTRY(169) -DISTINCT_INTERRUPT_ENTRY(170) -DISTINCT_INTERRUPT_ENTRY(171) -DISTINCT_INTERRUPT_ENTRY(172) -DISTINCT_INTERRUPT_ENTRY(173) -DISTINCT_INTERRUPT_ENTRY(174) -DISTINCT_INTERRUPT_ENTRY(175) -DISTINCT_INTERRUPT_ENTRY(176) -DISTINCT_INTERRUPT_ENTRY(177) -DISTINCT_INTERRUPT_ENTRY(178) -DISTINCT_INTERRUPT_ENTRY(179) -DISTINCT_INTERRUPT_ENTRY(180) -DISTINCT_INTERRUPT_ENTRY(181) -DISTINCT_INTERRUPT_ENTRY(182) -DISTINCT_INTERRUPT_ENTRY(183) -DISTINCT_INTERRUPT_ENTRY(184) -DISTINCT_INTERRUPT_ENTRY(185) -DISTINCT_INTERRUPT_ENTRY(186) -DISTINCT_INTERRUPT_ENTRY(187) -DISTINCT_INTERRUPT_ENTRY(188) -DISTINCT_INTERRUPT_ENTRY(189) -DISTINCT_INTERRUPT_ENTRY(190) -DISTINCT_INTERRUPT_ENTRY(191) -DISTINCT_INTERRUPT_ENTRY(192) -DISTINCT_INTERRUPT_ENTRY(193) -DISTINCT_INTERRUPT_ENTRY(194) -DISTINCT_INTERRUPT_ENTRY(195) -DISTINCT_INTERRUPT_ENTRY(196) -DISTINCT_INTERRUPT_ENTRY(197) -DISTINCT_INTERRUPT_ENTRY(198) -DISTINCT_INTERRUPT_ENTRY(199) -DISTINCT_INTERRUPT_ENTRY(200) -DISTINCT_INTERRUPT_ENTRY(201) -DISTINCT_INTERRUPT_ENTRY(202) -DISTINCT_INTERRUPT_ENTRY(203) -DISTINCT_INTERRUPT_ENTRY(204) -DISTINCT_INTERRUPT_ENTRY(205) -DISTINCT_INTERRUPT_ENTRY(206) -DISTINCT_INTERRUPT_ENTRY(207) -DISTINCT_INTERRUPT_ENTRY(208) -DISTINCT_INTERRUPT_ENTRY(209) -DISTINCT_INTERRUPT_ENTRY(210) -DISTINCT_INTERRUPT_ENTRY(211) -DISTINCT_INTERRUPT_ENTRY(212) -DISTINCT_INTERRUPT_ENTRY(213) -DISTINCT_INTERRUPT_ENTRY(214) -DISTINCT_INTERRUPT_ENTRY(215) -DISTINCT_INTERRUPT_ENTRY(216) -DISTINCT_INTERRUPT_ENTRY(217) -DISTINCT_INTERRUPT_ENTRY(218) -DISTINCT_INTERRUPT_ENTRY(219) -DISTINCT_INTERRUPT_ENTRY(220) -DISTINCT_INTERRUPT_ENTRY(221) -DISTINCT_INTERRUPT_ENTRY(222) -DISTINCT_INTERRUPT_ENTRY(223) -DISTINCT_INTERRUPT_ENTRY(224) -DISTINCT_INTERRUPT_ENTRY(225) -DISTINCT_INTERRUPT_ENTRY(226) -DISTINCT_INTERRUPT_ENTRY(227) -DISTINCT_INTERRUPT_ENTRY(228) -DISTINCT_INTERRUPT_ENTRY(229) -DISTINCT_INTERRUPT_ENTRY(230) -DISTINCT_INTERRUPT_ENTRY(231) -DISTINCT_INTERRUPT_ENTRY(232) -DISTINCT_INTERRUPT_ENTRY(233) -DISTINCT_INTERRUPT_ENTRY(234) -DISTINCT_INTERRUPT_ENTRY(235) -DISTINCT_INTERRUPT_ENTRY(236) -DISTINCT_INTERRUPT_ENTRY(237) -DISTINCT_INTERRUPT_ENTRY(238) -DISTINCT_INTERRUPT_ENTRY(239) -DISTINCT_INTERRUPT_ENTRY(240) -DISTINCT_INTERRUPT_ENTRY(241) -DISTINCT_INTERRUPT_ENTRY(242) -DISTINCT_INTERRUPT_ENTRY(243) -DISTINCT_INTERRUPT_ENTRY(244) -DISTINCT_INTERRUPT_ENTRY(245) -DISTINCT_INTERRUPT_ENTRY(246) -DISTINCT_INTERRUPT_ENTRY(247) -DISTINCT_INTERRUPT_ENTRY(248) -DISTINCT_INTERRUPT_ENTRY(249) -DISTINCT_INTERRUPT_ENTRY(250) -DISTINCT_INTERRUPT_ENTRY(251) -DISTINCT_INTERRUPT_ENTRY(252) -DISTINCT_INTERRUPT_ENTRY(253) -DISTINCT_INTERRUPT_ENTRY(254) -DISTINCT_INTERRUPT_ENTRY(255) - -/*PAGE - * void _ISR_Dispatch() - * - * Entry point from the outermost interrupt service routine exit. - * The current stack is the supervisor mode stack. - */ - - PUBLIC (_ISR_Dispatch) -SYM (_ISR_Dispatch): - - call SYM (_Thread_Dispatch) # invoke Dispatcher - - /* - * BEGINNING OF DE-ESTABLISH SEGMENTS - * - * NOTE: Make sure there is code here if code is added to - * load the segment registers. - * - */ - - /***** DE-ESTABLISH SEGMENTS CODE GOES HERE ****/ - - /* - * END OF DE-ESTABLISH SEGMENTS - */ - - popa # restore general registers - iret # return to interrupted thread - -/*PAGE - * - * void i386_Install_idt( - * unsigned32 source_offset, - * unsigned16 destination_segment, - * unsigned32 destination_offset - * ); - */ - - .align 2 - PUBLIC (i386_Install_idt) - -.set INSTALL_IDT_SAVED_REGS, 8 - -.set SOURCE_OFFSET_ARG, INSTALL_IDT_SAVED_REGS + 4 -.set DESTINATION_SEGMENT_ARG, INSTALL_IDT_SAVED_REGS + 8 -.set DESTINATION_OFFSET_ARG, INSTALL_IDT_SAVED_REGS + 12 - -SYM (i386_Install_idt): - push esi - push edi - - movl SOURCE_OFFSET_ARG(esp),esi - movl DESTINATION_OFFSET_ARG(esp),edi - - pushf # save flags - cli # DISABLE INTERRUPTS!!! - - movw DESTINATION_SEGMENT_ARG+4(esp),ax - push es # save es - movw ax,es - movsl # copy 1st half of IDT entry - movsl # copy 2nd half of IDT entry - pop es # restore es - - popf # ENABLE INTERRUPTS!!! - - pop edi - pop esi - ret - -/* - * void *i386_Logical_to_physical( - * rtems_unsigned16 segment, - * void *address - * ); - * - * Returns thirty-two bit physical address for segment:address. - */ - -.set SEGMENT_ARG, 4 -.set ADDRESS_ARG, 8 - - PUBLIC (i386_Logical_to_physical) - -SYM (i386_Logical_to_physical): - - xorl eax,eax # clear eax - movzwl SEGMENT_ARG(esp),ecx # ecx = segment value - movl $ SYM (_Global_descriptor_table),edx - # edx = address of our GDT - addl ecx,edx # edx = address of desired entry - movb 7(edx),ah # ah = base 31:24 - movb 4(edx),al # al = base 23:16 - shll $16,eax # move ax into correct bits - movw 2(edx),ax # ax = base 0:15 - movl ADDRESS_ARG(esp),ecx # ecx = address to convert - addl eax,ecx # ecx = physical address equivalent - movl ecx,eax # eax = ecx - ret - -/* - * void *i386_Physical_to_logical( - * rtems_unsigned16 segment, - * void *address - * ); - * - * Returns thirty-two bit physical address for segment:address. - */ - -/* - *.set SEGMENT_ARG, 4 - *.set ADDRESS_ARG, 8 -- use sets from above - */ - - PUBLIC (i386_Physical_to_logical) - -SYM (i386_Physical_to_logical): - xorl eax,eax # clear eax - movzwl SEGMENT_ARG(esp),ecx # ecx = segment value - movl $ SYM (_Global_descriptor_table),edx - # edx = address of our GDT - addl ecx,edx # edx = address of desired entry - movb 7(edx),ah # ah = base 31:24 - movb 4(edx),al # al = base 23:16 - shll $16,eax # move ax into correct bits - movw 2(edx),ax # ax = base 0:15 - movl ADDRESS_ARG(esp),ecx # ecx = address to convert - subl eax,ecx # ecx = logical address equivalent - movl ecx,eax # eax = ecx - ret - -END_CODE - -END |