diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/i386ex/start/start.S')
-rw-r--r-- | c/src/lib/libbsp/i386/i386ex/start/start.S | 218 |
1 files changed, 109 insertions, 109 deletions
diff --git a/c/src/lib/libbsp/i386/i386ex/start/start.S b/c/src/lib/libbsp/i386/i386ex/start/start.S index 1e32e33718..999c161b9b 100644 --- a/c/src/lib/libbsp/i386/i386ex/start/start.S +++ b/c/src/lib/libbsp/i386/i386ex/start/start.S @@ -2,14 +2,14 @@ * This file is the main boot and configuration file for the i386ex. It is * solely responsible for initializing the internal register set to reflect * the proper board configuration. This version is the "generic" i386ex - * startup: + * startup: * * 1) 512K flask ROM @3f80000 * 2) 1 Mb RAM @ 0x0 * 3) Timer0 used as RTEMS clock ticker, 1 msec tick rate. * 4) READY# is generated by CPU * - * The file is a multi-section file, with sections as follows: + * The file is a multi-section file, with sections as follows: * 1) interrupt gates, in section "ints" * 2) interrupt descriptor table, in section "idt" * 3) global descriptor table, in section "gdt" @@ -28,11 +28,11 @@ * * $Id$ - -changes: + +changes: SetExRegByte(ICW3S , 0x02 ) # MUST be 0x02 according to intel SetExRegByte(ICW3M , 0x04 ) # IR2 is cascaded internally: was 0x02 => IR1 is cascaded - + */ @@ -43,56 +43,56 @@ changes: /* * NEW_GAS Needed for binutils 2.9.1.0.7 and higher - */ + */ - EXTERN (boot_card) /* exits to bspstart */ + EXTERN (boot_card) /* exits to bspstart */ EXTERN (stack_start) /* defined in startup/linkcmds */ EXTERN (Clock_exit) PUBLIC (Interrupt_descriptor_table) PUBLIC ( SYM(IDTR) ) /* PUBLIC( SYM(_initInternalRegisters) ) */ - -BEGIN_DATA + +BEGIN_DATA SYM(IDTR): DESC3( SYM(Interrupt_descriptor_table), 0x07ff ); - + SYM(Interrupt_descriptor_table): /* Now in data section */ .rept 256 .word 0,0,0,0 .endr -END_DATA - +END_DATA + BEGIN_DATA PUBLIC (_Global_descriptor_table) - + SYM(GDTR): DESC3( GDT_TABLE, 0x1f ); # one less than the size -SYM (_Global_descriptor_table): +SYM (_Global_descriptor_table): SYM(GDT_TABLE): DESC2(0,0,0,0,0,0); -SYM(GDT_ALIAS): DESC2(32,0x1000,0x0,0x93,0,0x0); +SYM(GDT_ALIAS): DESC2(32,0x1000,0x0,0x93,0,0x0); SYM(GDT_CODE): DESC2(0xffff,0,0x0,0x9B,0xDF,0x00); SYM(GDT_DATA): DESC2(0xffff,0,0x0,0x92,0xDF,0x00); # was CF SYM(GDT_END): END_DATA - + /* This section is the section that is used by the interrupt descriptor table. It is used to provide the IDT with the correct vector offsets. It is for symbol definition only. */ - + .code16 .section .reset, "ax" - PUBLIC ( SYM(reset) ) + PUBLIC ( SYM(reset) ) SYM(reset): nop cli -#ifdef NEW_GAS +#ifdef NEW_GAS data32 addr32 jmp SYM(_initInternalRegisters) /* different section in this file */ #else jmp SYM(_initInternalRegisters) /* different section in this file */ -#endif +#endif /* .code32 in case this section moves */ nop /* required by CHIP LAB to pad out size */ nop @@ -105,27 +105,27 @@ SYM(reset): nop nop nop - + .section .initial, "ax" /* nop */ /* required for linker -- initial jump is to "label - 2" */ - /* nop */ /* ie. _initInternalRegisters -2 ( which now == .initial ) */ + /* nop */ /* ie. _initInternalRegisters -2 ( which now == .initial ) */ /* * Enable access to peripheral register at expanded I/O addresses */ -SYM(_initInternalRegisters): +SYM(_initInternalRegisters): /* .code16 */ - movw $0x8000 , ax + movw $0x8000 , ax outb al , $REMAPCFGH xchg al , ah outb al,$REMAPCFGL outw ax, $REMAPCFG ; /* * Configure operation of the A20 Address Line - */ + */ SYM(A20): movw $PORT92 , dx - + inb dx , al # clear A20 port reset andb $0xfe , al # b0 Fast Reset(0)=disabled,(1)=reset triggered orb $0x02 , al # Bit 1 Fast A20 = 0 (always 0) else enabled. @@ -135,11 +135,11 @@ SYM(A20): SYM(Watchdog): movw $WDTSTATUS , dx # address the WDT status port inb dx , al # get the WDT status - orb $0x01 , al # set the CLKDIS bit + orb $0x01 , al # set the CLKDIS bit outb al , dx # disable the clock to the WDT /* - * Initialize Refresh Control Unit for: + * Initialize Refresh Control Unit for: * Refresh Address = 0x0000 * Refresh gate between rows is 15.6 uSec @@ -148,20 +148,20 @@ SYM(Watchdog): * The refresh pin is not used. */ -SYM(InitRCU): +SYM(InitRCU): SetExRegWord( RFSCIR , 390) # refresh interval was 390, tried 312 SetExRegWord( RFSBAD , 0x0) # base address SetExRegWord( RFSADD , 0x0) # address register SetExRegWord( RFSCON , 0x8000) # enable bit /* - * Initialize clock and power mgmt unit for: + * Initialize clock and power mgmt unit for: * Clock Frequency = 50 Mhz * Prescaled clock output = 1 Mhz * Normal halt instructions */ - -SYM(InitClk): + +SYM(InitClk): SetExRegByte( PWRCON, 0x0 ) SetExRegWord( CLKPRS, 0x17) # 0x13 for 1.19318 MHz. 0x17 for 1MHz. @@ -170,7 +170,7 @@ SYM(InitClk): *************************************************************/ /* - * Initialize I/O port 1 for: + * Initialize I/O port 1 for: * PIN 0 = 1, DCD0# to package pin * PIN 1 = 1, RTS0# to package pin * PIN 2 = 1, DTR0# to package pin @@ -181,15 +181,15 @@ SYM(InitClk): * PIN 7 = 0, Outport (P17_HOLD to 386ex option header JP7 pin 3) */ -SYM(InitPort1): +SYM(InitPort1): SetExRegByte( P1LTC , 0xff ) SetExRegByte( P1DIR , 0x0 ) SetExRegByte( P1CFG , 0x1f) - + /* - * Initialize I/O port 2 for: - * PIN 0 = 0, Outport (P20_CS0# to 386ex option header JP7 pin 11) - * PIN 1 = 0, Outport (P21_CS1# to 386ex option header JP7 pin 9) + * Initialize I/O port 2 for: + * PIN 0 = 0, Outport (P20_CS0# to 386ex option header JP7 pin 11) + * PIN 1 = 0, Outport (P21_CS1# to 386ex option header JP7 pin 9) * PIN 2 = 1, CS2# (SMRAM) If not using CS2 can be configured as.? * PIN 3 = 0, Outport ( no connect ) * PIN 4 = 1, CS#4 (DRAM) @@ -197,34 +197,34 @@ SYM(InitPort1): * PIN 6 = 1, TXD0 output. * PIN 7 = 1, CTS0# input. */ - -SYM(InitPort2): + +SYM(InitPort2): SetExRegByte( P2LTC , 0xff ) SetExRegByte( P2DIR , 0x0 ) SetExRegByte( P2CFG , 0xfe) - + /* - * Initialize I/O port 3 P3CFG + * Initialize I/O port 3 P3CFG * PIN 0 = 1, TMROUT0 to package pin - * PIN 1 = 0, (TMROUT1 to 386ex option header JP7 pin 23) - * PIN 2 = 0, INT0 (IR1) disabled, (P3.2 out to JP7 pin 21) - * PIN 3 = 0, INT1 (IR5) disbled (P3.3 to option header JP7 pin 19) - * PIN 4 = 0, INT2 (IR6) disbled (P3.4 to option header JP7 pin 17) - * PIN 5 = 0, INT2 (IR7) disabled (P3.5 to 386ex header JP7 pin 15) + * PIN 1 = 0, (TMROUT1 to 386ex option header JP7 pin 23) + * PIN 2 = 0, INT0 (IR1) disabled, (P3.2 out to JP7 pin 21) + * PIN 3 = 0, INT1 (IR5) disbled (P3.3 to option header JP7 pin 19) + * PIN 4 = 0, INT2 (IR6) disbled (P3.4 to option header JP7 pin 17) + * PIN 5 = 0, INT2 (IR7) disabled (P3.5 to 386ex header JP7 pin 15) * PIN 6 = 0, Inport (Debugger Break P3.6/PWRD to package pin ) * P3.6 selected * PIN 7 = 0, COMCLK output disabled, 1.8432 Mhz OSC1 oscillator. * ( Debbugger uses COMCLK as the clocking source ) * P3.7 connected to package pin. */ - -SYM(InitPort3): + +SYM(InitPort3): SetExRegByte( P3LTC , 0xff ) SetExRegByte( P3DIR , 0x41 ) SetExRegByte( P3CFG , 0x09 ) # can check TMROUT0 /* - * Initialize Peripheral Pin Configurations: - * PIN 0 = 1, RTS1# to package pin + * Initialize Peripheral Pin Configurations: + * PIN 0 = 1, RTS1# to package pin * PIN 1 = 1, DTR1# to package pin * PIN 2 = 1, TXD1 out to package pin * PIN 3 = 0, EOP#/TC @@ -233,20 +233,20 @@ SYM(InitPort3): * PIN 6 = 0, 0 => CS6# connected to package pin * PIN 7 = 0, Don't care */ - -SYM(InitPeriph): - SetExRegByte( PINCFG , 0x24) - + +SYM(InitPeriph): + SetExRegByte( PINCFG , 0x24) + /* - * Initialize the Asynchronous Serial Ports: + * Initialize the Asynchronous Serial Ports: * BIT 7 = 1, Internal SIO1 modem signals * BIT 6 = 1, Internal SIO0 modem signals * BIT 2 = 0, PSCLK for SSIO clock - * BIT 1 = 1, SERCLK for SIO1 clock + * BIT 1 = 1, SERCLK for SIO1 clock * BIT 0 = 1, SERCLK for SIO0 clock */ -SYM(InitSIO): +SYM(InitSIO): SetExRegByte( SIOCFG, 0xC3 ) # SIOn clocked internally SetExRegByte( LCR0, 0x80 ) # latch DLL0, DLH0 @@ -255,48 +255,48 @@ SYM(InitSIO): SetExRegByte( LCR0, 0x03 ) # enable r/w buffers, IER0 accessible # mode 8-n-1 SetExRegByte( IER0, 0x00 ) # was 0x0f All interrupts detected - - SetExRegByte( LCR1, 0x80 ) # latch DLL0, DLH0 + + SetExRegByte( LCR1, 0x80 ) # latch DLL0, DLH0 SetExRegByte( DLL1, 0x51 ) # 0x51 set to 9600 baud, 0x7 = 115200 SetExRegByte( DLH1, 0x00 ) # 0x145 is 2400 baud SetExRegByte( LCR1, 0x03 ) # enable r/w buffers, IER1 accessible # reg 8-n-1 SetExRegByte( IER1, 0x00 ) # was 0x0f - All interrupts detected -SYM(InitMCR): +SYM(InitMCR): /* - * Initialize Timer for: + * Initialize Timer for: * BIT 7 = 1, Timer clocks disabled * BIT 6 = 0, Reserved * BIT 5 = 1, TMRCLK2 instead of Vcc to Gate2 * BIT 4 = 0, PSCLK to CLK2 * BIT 3 = 1, TMRCLK1 instead of Vcc to Gate1 * BIT 2 = 0, PSCLK to Gate1 - * BIT 1 = 0, Vcc to Gate0 + * BIT 1 = 0, Vcc to Gate0 * BIT 0 = 0, PSCLK to Gate0 */ -SYM(InitTimer): - SetExRegByte(TMRCFG , 0x80 ) # All counters disabled, Gates 0,1 +SYM(InitTimer): + SetExRegByte(TMRCFG , 0x80 ) # All counters disabled, Gates 0,1 # and 2 are set to Vcc SetExRegByte(TMRCON , 0x34 ) # prepare to write counter 0 LSB,MSB SetExRegByte(TMR0 , 0x00 ) # sfa - SetExRegByte(TMR0 , 0x00 ) # sfa + SetExRegByte(TMR0 , 0x00 ) # sfa + - SetExRegByte(TMRCON , 0x70 ) # mode 0 disables on Gate= Vcc - SetExRegByte(TMR1 , 0x00 ) # sfa SetExRegByte(TMR1 , 0x00 ) # sfa - + SetExRegByte(TMR1 , 0x00 ) # sfa + SetExRegByte(TMRCON , 0xB0 ) # mode 0 disables on gate =Vcc - SetExRegByte(TMR2 , 0x00 ) # - SetExRegByte(TMR2 , 0x00 ) # + SetExRegByte(TMR2 , 0x00 ) # + SetExRegByte(TMR2 , 0x00 ) # SetExRegByte(TMRCFG , 0x80 ) # Enable = 0x00 /* - * Initialize the DMACFG register for: + * Initialize the DMACFG register for: * BIT 7 = 1 , Disable DACK#1 * BITs 6:4 = 100, TMROUT2 connected to DRQ1 * BIT 3 = 1 , Disable DACK0# @@ -316,17 +316,17 @@ SYM(InitTimer): */ SYM(InitInt): - + cli # ! /* SetExRegByte(OCW3S, 0x20) # address the Slave status port - movw $OCW3S , dx + movw $OCW3S , dx inb dx , al # Read the IRR. - SetExRegByte(OCW3M, 0x20) # address the Master status port - movw $OCW3M , dx + SetExRegByte(OCW3M, 0x20) # address the Master status port + movw $OCW3M , dx inb dx , al # Read the IRR. -*/ - +*/ + SetExRegByte(ICW1S , 0x11 ) # EDGE TRIGGERED SetExRegByte(ICW2S , 0x28 ) # Slave base vector after Master SetExRegByte(ICW3S , 0x02 ) # slave cascaded to IR2 on master @@ -336,65 +336,65 @@ SYM(InitInt): SetExRegByte(ICW2M , 0x20 ) # base vector starts at byte 32 SetExRegByte(ICW3M , 0x04) # IR2 is cascaded internally SetExRegByte(ICW4M , 0x01 ) # fully nested mode - - SetExRegByte(OCW1M , 0xde ) # IR0 only = 0xfe. + + SetExRegByte(OCW1M , 0xde ) # IR0 only = 0xfe. # for IR5 and IR0 active use 0xde # for IR0 and IR2 use 0xfa SetExRegByte(INTCFG , 0x00 ) - - -SYM(SetCS4): + + +SYM(SetCS4): SetExRegWord(CS4ADL , 0x702) #Configure chip select 4 SetExRegWord(CS4ADH , 0x00) - SetExRegWord(CS4MSKH, 0x03F) - SetExRegWord(CS4MSKL, 0xFC01) + SetExRegWord(CS4MSKH, 0x03F) + SetExRegWord(CS4MSKL, 0xFC01) -SYM(SetUCS1): +SYM(SetUCS1): SetExRegWord(UCSADL , 0x0304) # 512K block starting at 0x80000 until 0x3f80000 SetExRegWord(UCSADH , 0x03F8) - SetExRegWord(UCSMSKH, 0x03F7) + SetExRegWord(UCSMSKH, 0x03F7) SetExRegWord(UCSMSKL, 0xFC01) # configure upper chip select /****************************************************** * The GDT must be in RAM since it must be writeable, * So, move the whole data section down. ********************************************************/ - + movw $ _ram_data_offset , di - movw $ _ram_data_segment, cx + movw $ _ram_data_segment, cx mov cx , es - movw $ _data_size , cx - movw $ _rom_data_segment, ax - movw $ _rom_data_offset , si + movw $ _data_size , cx + movw $ _rom_data_segment, ax + movw $ _rom_data_offset , si mov ax , ds - + repne movsb - + /***************************** * Load the Global Descriptor * Table Register ****************************/ - -#ifdef NEW_GAS + +#ifdef NEW_GAS data32 addr32 lgdt SYM(GDTR) # location of GDT #else lgdt SYM(GDTR) # location of GDT -#endif +#endif + - -SYM(SetUCS): - SetExRegWord(UCSADL, 0x0702) # now 512K starting at 0x3f80000. +SYM(SetUCS): + SetExRegWord(UCSADL, 0x0702) # now 512K starting at 0x3f80000. SetExRegWord(UCSADH, 0x03f8) - SetExRegWord(UCSMSKH, 0x0007) + SetExRegWord(UCSMSKH, 0x0007) SetExRegWord(UCSMSKL, 0xFC01) # configure upper chip select - + /* * SRAM chip select: 16 bit bus size,starting 16Mb, size 512k, * 4 waits */ - + #ifdef UT_I386EX SYM(SetCS1): @@ -411,7 +411,7 @@ SYM(SetCS2): /* * Real-time clock: 8 bit bus size, starting@16Mb+512K, size 32k - * 4 waits + * 4 waits */ SYM(SetCS3): SetExRegWord(CS3ADL, 0x0504) @@ -427,25 +427,25 @@ SYM(SetCS3): mov cr0, eax orw $0x1, ax mov eax, cr0 - + /************************** * Flush prefetch queue, * and load CS selector *********************/ ljmpl $ GDT_CODE_PTR , $ SYM(_load_segment_registers) # sets the code selector - + /* * Load the segment registers */ -SYM(_load_segment_registers): +SYM(_load_segment_registers): .code32 pLOAD_SEGMENT( GDT_DATA_PTR, fs) pLOAD_SEGMENT( GDT_DATA_PTR, gs) pLOAD_SEGMENT( GDT_DATA_PTR, ss) pLOAD_SEGMENT( GDT_DATA_PTR, ds) pLOAD_SEGMENT( GDT_DATA_PTR, es) - + /* * Set up the stack */ @@ -481,7 +481,7 @@ SYM (zero_bss): pushl $0 # argc movw $0xFFFB, SYM(i8259s_cache) # ICU mask values reflect - # initial ICU state + # initial ICU state call SYM(boot_card) addl $12,esp |