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[FREELDR]

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Reimplement Int386 based on realmode callback mechanism.

svn path=/trunk/; revision=52227
This commit is contained in:
Timo Kreuzer 2011-06-14 14:53:02 +00:00
parent cdd784fd19
commit 5d9b09f212
4 changed files with 73 additions and 32 deletions
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1
reactos/boot/freeldr/freeldr/CMakeLists.txt
View file

@ -19,7 +19,6 @@ if(ARCH MATCHES i386)
arch/i386/i386pnp.S
arch/i386/i386pxe.S
arch/i386/i386trap.S
arch/i386/int386.S
arch/i386/linux.S
arch/i386/mb.S
arch/i386/i386bug.c)

37
reactos/boot/freeldr/freeldr/arch/i386/entry.S
View file

@ -63,8 +63,6 @@ _FrldrStartup:
mov eax, dword ptr ds:[BSS_RealModeEntry]
mov dword ptr ds:[SwitchToReal16Address], eax
call _Int386_ // test
/* GO! */
xor eax, eax
push eax
@ -222,8 +220,25 @@ PUBLIC _EnableA20
_EnableA20:
ret
PUBLIC _Int386_
_Int386_:
Int386_regsin:
.long 0
Int386_regsout:
.long 0
/*
* int Int386(int ivec, REGS* in, REGS* out);
*/
PUBLIC _Int386
_Int386:
/* Get the function parameters */
mov eax, dword ptr [esp + 4]
mov dword ptr ds:[BSS_IntVector], eax
mov eax, dword ptr [esp + 8]
mov dword ptr [Int386_regsin], eax
mov eax, dword ptr [esp + 12]
mov dword ptr [Int386_regsout], eax
/* Save all registers + segment registers */
push ds
push es
@ -231,8 +246,14 @@ _Int386_:
push gs
pusha
/* Copy input registers */
mov esi, dword ptr [Int386_regsin]
mov edi, BSS_RegisterSet
mov ecx, 9
rep movsd
/* Set the callback index */
mov cx, 1234
mov bx, 0
/* Set continue address and switch to real mode */
mov dword ptr [ContinueAddress], offset Int386_return
@ -240,6 +261,12 @@ _Int386_:
Int386_return:
/* Copy output registers */
mov esi, BSS_RegisterSet
mov edi, dword ptr [Int386_regsout]
mov ecx, 9
rep movsd
popa
pop gs
pop fs

10
reactos/boot/freeldr/freeldr/arch/realmode/i386.S
View file

@ -91,10 +91,10 @@ inrmode:
sti /* These are ok now */
/* Do the callback, specified by cx */
// call word ptr CallbackTable[cx * 4]
mov ax, cx
call writehex4
/* Do the callback, specified by bx */
shl bx, 1
call word ptr ds:[callback_table + bx]
/*
* Switches the processor to protected mode
@ -123,6 +123,8 @@ pm_offset:
nop
callback_table:
.word Int386
/* 16-bit stack pointer */

57
reactos/boot/freeldr/freeldr/arch/realmode/int386.inc
View file

@ -1,26 +1,33 @@
Int386:
/* Save all registers + segment registers */
push ds
push es
push fs
push gs
pushad
/* Get the interupt vector and patch the opcode */
mov al, byte ptr ds:[BSS_IntVector]
mov byte ptr ds:[Int386_vector_opcode], al
/* Setup the registers */
mov ax, word ptr cs:[BSS_RegisterSet + REGS_DS]
mov ds, ax /* DS register */
mov ds, ax
mov ax, word ptr cs:[BSS_RegisterSet + REGS_ES]
mov es, ax /* ES register */
mov es, ax
mov ax, word ptr cs:[BSS_RegisterSet + REGS_FS]
mov fs, ax /* FS register */
mov fs, ax
mov ax, word ptr cs:[BSS_RegisterSet + REGS_GS]
mov gs, ax /* GS register */
mov gs, ax
mov eax, dword ptr cs:[BSS_RegisterSet + REGS_EAX] /* EAX register */
mov ebx, dword ptr cs:[BSS_RegisterSet + REGS_EBX] /* EBX register */
mov ecx, dword ptr cs:[BSS_RegisterSet + REGS_ECX] /* ECX register */
mov edx, dword ptr cs:[BSS_RegisterSet + REGS_EDX] /* EDX register */
mov esi, dword ptr cs:[BSS_RegisterSet + REGS_ESI] /* ESI register */
mov edi, dword ptr cs:[BSS_RegisterSet + REGS_EDI] /* EDI register */
mov eax, dword ptr cs:[BSS_RegisterSet + REGS_EAX]
mov ebx, dword ptr cs:[BSS_RegisterSet + REGS_EBX]
mov ecx, dword ptr cs:[BSS_RegisterSet + REGS_ECX]
mov edx, dword ptr cs:[BSS_RegisterSet + REGS_EDX]
mov esi, dword ptr cs:[BSS_RegisterSet + REGS_ESI]
mov edi, dword ptr cs:[BSS_RegisterSet + REGS_EDI]
/* Do not set the flags register */
/* only return its value in regsout */
@ -32,24 +39,30 @@ Int386_vector_opcode:
.byte 0x00
/* Save the registers */
mov dword ptr cs:[BSS_RegisterSet + REGS_EAX], eax /* EAX register */
mov dword ptr cs:[BSS_RegisterSet + REGS_EBX], ebx /* EBX register */
mov dword ptr cs:[BSS_RegisterSet + REGS_ECX], ecx /* ECX register */
mov dword ptr cs:[BSS_RegisterSet + REGS_EDX], edx /* EDX register */
mov dword ptr cs:[BSS_RegisterSet + REGS_ESI], esi /* ESI register */
mov dword ptr cs:[BSS_RegisterSet + REGS_EDI], edi /* EDI register */
mov dword ptr cs:[BSS_RegisterSet + REGS_EAX], eax
mov dword ptr cs:[BSS_RegisterSet + REGS_EBX], ebx
mov dword ptr cs:[BSS_RegisterSet + REGS_ECX], ecx
mov dword ptr cs:[BSS_RegisterSet + REGS_EDX], edx
mov dword ptr cs:[BSS_RegisterSet + REGS_ESI], esi
mov dword ptr cs:[BSS_RegisterSet + REGS_EDI], edi
mov ax, ds /* DS register */
mov ax, ds
mov word ptr cs:[BSS_RegisterSet + REGS_DS], ax
mov ax, es /* ES register */
mov ax, es
mov word ptr cs:[BSS_RegisterSet + REGS_ES], ax
mov ax, fs /* FS register */
mov ax, fs
mov word ptr cs:[BSS_RegisterSet + REGS_FS], ax
mov ax, gs /* GS register */
mov ax, gs
mov word ptr cs:[BSS_RegisterSet + REGS_GS], ax
pushf
pop dword ptr cs:[BSS_RegisterSet + REGS_EFLAGS] /* EFLAGS register */
pushfd
pop dword ptr cs:[BSS_RegisterSet + REGS_EFLAGS]
popad
pop gs
pop fs
pop es
pop ds
ret