asm {
USE32
SYS_PCIBIOS_SERVICE_DIR:: DU32 0;
SYS_PCI_SERVICES:: DU32 0;
SYS_FIND_PCIBIOS_SERVICE_DIR::
MOV ESI,0xE0000
MOV ECX,(0x100000-0xE0000)/4
@@05: CMP U32 [ESI],'_32_'
JNE @@20
PUSH ECX
XOR ECX,ECX
MOV CL,U8 9[ESI]
SHL ECX,4
@@10: MOV EDI,ESI
XOR EAX,EAX
XOR EDX,EDX
@@15: MOV DL,U8 [EDI]
ADD EAX,EDX
INC EDI
DEC ECX
JNZ @@15
POP ECX
TEST AL,AL
JNZ @@20
MOV U32 [SYS_PCIBIOS_SERVICE_DIR],ESI
MOV ESI,U32 4[ESI]
MOV U32 [SYS_PCIBIOS_SERVICE_CALL],ESI
RET
@@20: ADD ESI,4
LOOP @@05
MOV U32 [SYS_PCIBIOS_SERVICE_DIR],0
RET
SYS_FIND_PCI_SERVICES::
MOV ESI,U32 [SYS_PCIBIOS_SERVICE_DIR]
TEST ESI,ESI
JNZ @@05
MOV U32 [SYS_PCI_SERVICES],0
RET
@@05: MOV EAX,'$PCI'
XOR EBX,EBX
DU8 0x9A; //CALL CGDT.cs32:PCIBIOS_SERVICE
SYS_PCIBIOS_SERVICE_CALL:: DU32 0;
DU16 CGDT.cs32;
TEST AL,AL
JNZ @@05
LEA ESI,U32 [EBX+EDX]
MOV U32 [SYS_PCI_SERVICES],ESI
RET
@@05: MOV U32 [SYS_PCI_SERVICES],0
RET
USE64
C32_EAX:: DU32 0;
C32_EBX:: DU32 0;
C32_ECX:: DU32 0;
C32_EDX:: DU32 0;
C32_ESI:: DU32 0;
C32_EDI:: DU32 0;
C32_EFLAGS:: DU32 0;
C32_RSP:: DU64 0;
_FAR_CALL32::
//This calls a 32-bit mode routine.
//(We must switch from 64-bit mode to do it.)
//
//NON REENTRANT
//
PUSH RBP
MOV RBP,RSP
MOV RAX,U64 SF_ARG1[RBP]
TEST RAX,RAX
JNZ @@05
POP RBP
RET1 8 //return FALSE
@@05: MOV U32 [C32_ADD],EAX
PUSH_REGS
PUSHFD
XOR RAX,RAX
PUSH U64 FS:CTask.addr[RAX]
PUSH U64 GS:CCPU.addr[RAX]
MOV U64 [C32_RSP],RSP
PUSH U32 CGDT.ds //STKSEG
PUSH U32 BOOT_RAM_LIMIT //STK
PUSH U32 0 //FLAGS--interrupts off
PUSH U32 CGDT.cs32
LEA RAX,[@@15]
PUSH RAX
IRET
USE32
@@15:
WBINVD
//disable paging
MOV_EAX_CR0
BTR EAX,31
MOV_CR0_EAX
MOV ECX,IA32_EFER
XOR EDX,EDX
XOR EAX,EAX
WRMSR
MOV AX,CGDT.ds
MOV FS,AX
MOV GS,AX
//SS already set
MOV EAX,U32 [C32_EAX]
MOV EBX,U32 [C32_EBX]
MOV ECX,U32 [C32_ECX]
MOV EDX,U32 [C32_EDX]
MOV ESI,U32 [C32_ESI]
MOV EDI,U32 [C32_EDI]
MOV U32 [C32_EFLAGS],0
DU8 0x9A; //CALL CGDT.cs32:[C32_ADD]
C32_ADD:: DU32 0;
DU16 CGDT.cs32;
PUSHFD
POP U32 [C32_EFLAGS]
MOV U32 [C32_EAX],EAX
MOV U32 [C32_EBX],EBX
MOV U32 [C32_ECX],ECX
MOV U32 [C32_EDX],EDX
MOV U32 [C32_ESI],ESI
MOV U32 [C32_EDI],EDI
PUSH U32 0 //Return from next call will be 64-bit
CALL SYS_ENTER_LONG_MODE
USE64 MOV RSP,U64 [C32_RSP]
POP RAX
CALL SET_GS_BASE
POP RAX
CALL SET_FS_BASE
POPFD
POP_REGS
XOR RAX,RAX
MOV AL,TRUE
POP RBP
RET1 8
}
_extern C32_EAX U32 c32_eax;
_extern C32_EBX U32 c32_ebx;
_extern C32_ECX U32 c32_ecx;
_extern C32_EDX U32 c32_edx;
_extern C32_ESI U32 c32_esi;
_extern C32_EDI U32 c32_edi;
_extern C32_EFLAGS U32 c32_eflags;
_extern SYS_PCI_SERVICES U32 sys_pci_services;
_extern _FAR_CALL32 Bool FarCall32(U0 (*fp_addr)());//Not reentrant.For PCIBIOS.
U8 PCIReadU8(I64 bus,I64 dev,I64 fun,I64 rg)
{//Read U8 in PCI configspace at bus,dev,fun,reg.
I64 res;
PUSHFD
CLI
while (LBts(&sys_semas[SEMA_FAR_CALL32],0))
Yield;
c32_eax=0xB108;
c32_ebx=bus<<8+dev<<3+fun;
c32_edi=rg;
if (FarCall32(sys_pci_services))
res=c32_ecx.u8[0];
else
res=0xFF;
LBtr(&sys_semas[SEMA_FAR_CALL32],0);
POPFD
return res;
}
U16 PCIReadU16(I64 bus,I64 dev,I64 fun,I64 rg)
{//Read U16 in PCI configspace at bus,dev,fun,reg.
I64 res;
PUSHFD
CLI
while (LBts(&sys_semas[SEMA_FAR_CALL32],0))
Yield;
c32_eax=0xB109;
c32_ebx=bus<<8+dev<<3+fun;
c32_edi=rg;
if (FarCall32(sys_pci_services))
res=c32_ecx.u16[0];
else
res=0xFFFF;
LBtr(&sys_semas[SEMA_FAR_CALL32],0);
POPFD
return res;
}
U32 PCIReadU32(I64 bus,I64 dev,I64 fun,I64 rg)
{//Read U32 in PCI configspace at bus,dev,fun,reg.
I64 res;
PUSHFD
CLI
while (LBts(&sys_semas[SEMA_FAR_CALL32],0))
Yield;
c32_eax=0xB10A;
c32_ebx=bus<<8+dev<<3+fun;
c32_edi=rg;
if (FarCall32(sys_pci_services))
res=c32_ecx;
else
res=0xFFFFFFFF;
LBtr(&sys_semas[SEMA_FAR_CALL32],0);
POPFD
return res;
}
U0 PCIWriteU8(I64 bus,I64 dev,I64 fun,I64 rg,I64 val)
{//Write U8 in PCI configspace at bus,dev,fun,reg.
PUSHFD
CLI
while (LBts(&sys_semas[SEMA_FAR_CALL32],0))
Yield;
c32_eax=0xB10B;
c32_ebx=bus<<8+dev<<3+fun;
c32_edi=rg;
c32_ecx=val;
FarCall32(sys_pci_services);
LBtr(&sys_semas[SEMA_FAR_CALL32],0);
POPFD
}
U0 PCIWriteU16(I64 bus,I64 dev,I64 fun,I64 rg,I64 val)
{//Write U16 in PCI configspace at bus,dev,fun,reg.
PUSHFD
CLI
while (LBts(&sys_semas[SEMA_FAR_CALL32],0))
Yield;
c32_eax=0xB10C;
c32_ebx=bus<<8+dev<<3+fun;
c32_edi=rg;
c32_ecx=val;
FarCall32(sys_pci_services);
LBtr(&sys_semas[SEMA_FAR_CALL32],0);
POPFD
}
U0 PCIWriteU32(I64 bus,I64 dev,I64 fun,I64 rg,I64 val)
{//Write U32 in PCI configspace at bus,dev,fun,reg.
PUSHFD
CLI
while (LBts(&sys_semas[SEMA_FAR_CALL32],0))
Yield;
c32_eax=0xB10D;
c32_ebx=bus<<8+dev<<3+fun;
c32_edi=rg;
c32_ecx=val;
FarCall32(sys_pci_services);
LBtr(&sys_semas[SEMA_FAR_CALL32],0);
POPFD
}
I64 PCIClassFind(I64 class_code,I64 n)
{/*Find bus,dev,fun of Nth class_code dev.
class_code is low three bytes
n is index starting at zero
Return: -1 not found
else bus,dev,fun.
*/
I64 res;
PUSHFD
CLI
while (LBts(&sys_semas[SEMA_FAR_CALL32],0))
Yield;
c32_eax=0xB103;
c32_esi=n;
c32_ecx=class_code;
if (FarCall32(sys_pci_services) && !c32_eax.u8[1])
res=c32_ebx.u8[1]<<16+(c32_ebx&0xF8)<<5+c32_ebx&7;
else
res=-1;
LBtr(&sys_semas[SEMA_FAR_CALL32],0);
POPFD
return res;
}