?? start.s
字號:
.file "start.s"
.text
/*---------------------------------------------------------------------------
| EXPORTS - Functions
*/
.global u_print
.global u_putch
.global u_getch
.global u_kbhit
.global _start
/*---------------------------------------------------------------------------
| IMPORTS - Functions
*/
.extern c_start
.extern p_asm_timerISR
.extern p_asm_extISR
.extern __STACK_TOP
/*---------------------------------------------------------------------------
| MACROS
*-------------------------------------------------------------------------*/
#define ENDFUNC(fname) .type fname,@function ; .size fname,.-fname
/*---------------------------------------------------------------------------
| DEFINITIONS
*-------------------------------------------------------------------------*/
/* baud rate divisor */
/*#define UART_DIV_9600_LO 0x48 // at 11.0592 MHz -> evaluation Board*/
#define UART_DIV_9600_LO 0x60 /* at 14.7456 MHz */
#define UART_DIV_9600_HI 0x00
#define PVR 0x11f /* processor version register */
#define PVR_440GP 0x40120000
#define PVR_440GP_PASS_1_0 0x40120040 /* RevA */
#define PVR_440GP_PASS_1_1 0x40120440 /* RevA */
#define PVR_440GP_PASS_2_0 0x40120481 /* RevB */
#define SRR0 0x01a /* save/restore register 0 */
#define SRR1 0x01b /* save/restore register 1 */
#define CSRR0 0x03a /* critical save/restore register 0 */
#define CSRR1 0x03b /* critical save/restore register 1 */
#define DBSR 0x130 /* debug status register */
#define DBCR0 0x134 /* debug control register 0 */
#define DBCR1 0x135 /* debug control register 1 */
#define DBCR2 0x136 /* debug control register 2 */
#define IAC1 0x138 /* instruction address comparator 1 */
#define IAC2 0x139 /* instruction address comparator 2 */
#define IAC3 0x13a /* instruction address comparator 3 */
#define IAC4 0x13b /* instruction address comparator 4 */
#define DAC1 0x13c /* data address comparator 1 */
#define DAC2 0x13d /* data address comparator 2 */
#define DVC1 0x13e /* data value compare register 1 */
#define DVC2 0x13f /* data value compare register 2 */
#define XER 0x001 /* fixed point exception register */
#define LR 0x008 /* link register */
#define CTR 0x009 /* count register */
#define DEC 0x016 /* decrementer timer */
#define ESR 0x03e /* execption syndrome register */
#define IVPR 0x03f /* interrupt vector prefix register */
#define TBLW 0x11c /* time base lower - privileged write */
#define TBUW 0x11d /* time base upper - privileged write */
#define TSR 0x150 /* timer status register */
#define TCR 0x154 /* timer control register */
#define IVOR0 0x190 /* interrupt vector offset reg - critical input */
#define IVOR1 0x191 /* interrupt vector offset reg - machine check */
#define IVOR2 0x192 /* interrupt vector offset reg - data storage */
#define IVOR3 0x193 /* interrupt vector offset reg - instr storage */
#define IVOR4 0x194 /* interrupt vector offset reg - ext input */
#define IVOR5 0x195 /* interrupt vector offset reg - alignment */
#define IVOR6 0x196 /* interrupt vector offset reg - program */
#define IVOR7 0x197 /* interrupt vector offset reg - floating pt unavail */
#define IVOR8 0x198 /* interrupt vector offset reg - system call */
#define IVOR9 0x199 /* interrupt vector offset reg - aux proc unavail */
#define IVOR10 0x19a /* interrupt vector offset reg - decrementer */
#define IVOR11 0x19b /* interrupt vector offset reg - fixed int timer */
#define IVOR12 0x19c /* interrupt vector offset reg - watchdog timer */
#define IVOR13 0x19d /* interrupt vector offset reg - data tlb error */
#define IVOR14 0x19e /* interrupt vector offset reg - instr tlb error */
#define IVOR15 0x19f /* interrupt vector offset reg - debug */
#define CCR0 0x3b3 /* core configuration register */
#define CPC0_CR0 0x0EB /* Control Register 0 */
#define CPC0_ER 0x0B1 /* CPM Enable Register */
#define CPC0_FR 0x0B2 /* CPM Force Register */
#define CPC0_CR0_U0EC 0x00400000
#define CPC0_CR0_U1EC 0x00200000
#define CPC0_CR0_CETE 0x40000000
#define CPC0_CR0_INIT 0x20600000
#define DBSR_MRR_MASK 0x30000000 /* Most recent reset */
#define DBSR_MRR_CORE 0x10000000 /* Core reset */
#define DBSR_MRR_CHIP 0x20000000 /* Chip reset */
#define DBSR_MRR_SYS 0x30000000 /* System reset */
#define CCR0_DAPUIB 0x00100000 /* Disable APU instruction broadcast */
#define CCR0_GICBT 0x00004000 /* Guaranteed instr cache block touch */
#define CCR0_GDCBT 0x00002000 /* Guaranteed data cache block touch */
#define CCR0_BTAC_DISABLE 0x00000040
#define INV0 0x370 /* instruction cache normal victim 0 */
#define INV1 0x371 /* instruction cache normal victim 1 */
#define INV2 0x372 /* instruction cache normal victim 2 */
#define INV3 0x373 /* instruction cache normal victim 3 */
#define ITV0 0x374 /* instruction cache transient victim 0 */
#define ITV1 0x375 /* instruction cache transient victim 1 */
#define ITV2 0x376 /* instruction cache transient victim 2 */
#define ITV3 0x377 /* instruction cache transient victim 3 */
#define DNV0 0x390 /* data cache normal victim 0 */
#define DNV1 0x391 /* data cache normal victim 1 */
#define DNV2 0x392 /* data cache normal victim 2 */
#define DNV3 0x393 /* data cache normal victim 3 */
#define DTV0 0x394 /* data cache transient victim 0 */
#define DTV1 0x395 /* data cache transient victim 1 */
#define DTV2 0x396 /* data cache transient victim 2 */
#define DTV3 0x397 /* data cache transient victim 3 */
#define DVLIM 0x398 /* data cache victim limit */
#define IVLIM 0x399 /* instruction cache victim limit */
#define MMUCR 0x3b2 /* memory management control register */
#define MAX_TLB_ENTRIES 64 /* max. number of TLB entries */
#define IVLIM_TFLOOR_ENCODE(x) (((x)&0x3F)<<22)
#define IVLIM_TCEILING_ENCODE(x) (((x)&0x3F)<<11)
#define IVLIM_NFLOOR_ENCODE(x) (((x)&0x3F)<<0)
#define DVLIM_TFLOOR_ENCODE(x) (((x)&0x3F)<<22)
#define DVLIM_TCEILING_ENCODE(x) (((x)&0x3F)<<11)
#define DVLIM_NFLOOR_ENCODE(x) (((x)&0x3F)<<0)
#define MMUCR_STID_ENCODE(x) (((x)&0xFF)<<0)
#define MMUCR_DEFAULT 0x00600000
#define UIC0_SR 0x0C0
#define UIC0_ER 0x0C2
#define UIC1_SR 0x0D0
#define UIC1_ER 0x0D2
#define TBLR 0x10C
#define TSR_PIT 0x08000000 /* PIT interrupt pending */
#define UART0_MMIO_BASE 0xE0000200
#define UART_DATA_REG 0x00
#define UART_DL_LSB 0x00
#define UART_DL_MSB 0x01
#define UART_INT_ENABLE 0x01
#define UART_FIFO_CONTROL 0x02
#define UART_LINE_CONTROL 0x03
#define UART_MODEM_CONTROL 0x04
#define UART_LINE_STATUS 0x05
#define UART_MODEM_STATUS 0x06
#define UART_SCRATCH 0x07
#define MSR_POW 0x00040000 /* Activates power management */
#define MSR_WE 0x00040000 /* wait state enable */
#define MSR_CE 0x00020000 /* critical interrupt enable */
#define MSR_ILE 0x00010000 /* Interrupt little Endian */
#define MSR_EE 0x00008000 /* external interrupt */
#define MSR_PR 0x00004000 /* problem state */
#define MSR_FP 0x00002000 /* floating point available */
#define MSR_ME 0x00001000 /* machine check */
#define MSR_FE0 0x00000800 /* floating point exception enable */
#define MSR_SE 0x00000400 /* single step trace enable */
#define MSR_BE 0x00000200 /* branch trace enable */
#define MSR_DE 0x00000200 /* debug enable */
#define MSR_FE1 0x00000100 /* floating point exception enable */
#define MSR_EP 0x00000040 /* prefix */
#define MSR_IP 0x00000040 /* prefix */
#define MSR_IR 0x00000020 /* instruction relocate */
#define MSR_DR 0x00000010 /* data relocate */
#define MSR_RI 0x00000002 /* Recoverable interrupt */
#define MSR_LE 0x00000001 /* Little Endian */
#define MSR_VALUE (MSR_FP | MSR_CE | MSR_ME | MSR_EE)
#define SRAM_START 0xC0000000
#define SRAM_SIZE 0x2000
#define SRAM_INITSEG 0xFFFFD000
/* Interrupt Vectors */
.set ..crit_vector, 0x0100
.set ..mach_vector, 0x0200
.set ..prot_vector, 0x0300
.set ..isi_vector, 0x0400
.set ..ext_vector, 0x0500
.set ..align_vector, 0x0600
.set ..prog_vector, 0x0700
.set ..fpu_vector, 0x0800
.set ..sys_vector, 0x0900
.set ..apu_vector, 0x0A00
.set ..dec_vector, 0x0B00
.set ..fit_vector, 0x0C00
.set ..wadt_vector, 0x0D00
.set ..dtlb_vector, 0x0E00
.set ..itlb_vector, 0x0F00
.set ..debug_vector, 0x0F80
/*---------------------------------------------------------------------------
|
| Start of chip initialization. This is the entry point.
|
*-------------------------------------------------------------------------*/
.text
.align 2
_start:
/* invalidate the instruction and data cache */
iccci %r0, %r0
dccci %r0, %r0
sync
/* read processor version register */
mfspr r9,PVR
addis r10, 0, PVR_440GP_PASS_1_0@h
ori r10,r10, PVR_440GP_PASS_1_0@l
addis r11, 0, PVR_440GP_PASS_1_1@h
ori r11,r11, PVR_440GP_PASS_1_1@l
/* clear SRR0, CSRR0, SRR1, CSRR1 */
xor r0,r0,r0
mtspr SRR0,r0
mtspr SRR1,r0
mtspr CSRR0,r0
mtspr CSRR1,r0
/* Clear CPM Registers (enable all functional CPU units) */
mtspr CPC0_ER,r0
mtspr CPC0_FR,r0
/*
Clear DBCR0 register (disable all debug events)
Reset all other debugging registers associated with DBCR0.
Although the PPC440GP is defined to reset some of the debug event
enables during the reset operation, this is not required by the
architecture and hence the initialization software should not assume
this behavior. Software should disable all debug events in order to
prevent non-deterministic behavior on the trace interface to the core.
*/
/*
mtspr DBCR0,r0
mtspr DBCR1,r0
mtspr DBCR2,r0
mtspr IAC1,r0
mtspr IAC2,r0
mtspr IAC3,r0
mtspr IAC4,r0
mtspr DAC1,r0
mtspr DAC2,r0
mtspr DVC1,r0
mtspr DVC2,r0
*/
/* Clear DBSR register (initialize all debug event status) */
/*
addi r0, 0,-1 // r0 = 0xFFFFFFFF
addis r1, 0,DBSR_MRR_MASK@h
ori r1,r1,DBSR_MRR_MASK@l
andc r1,r0,r1 // Keep the DBSR[MRR] bits
mtspr DBSR,r1
*/
/*
Initialize CCR0 register
a. Enable store gathering
b. Disable broadcast of instrs to aux processor (save power)
c. Enable broadcast of trace information
d. Icbt is guaranteed to fill a cache line even during a stall
e. Dcbt is guaranteed to fill a cache line even during a stall
f. Disable exceptions for misaligned data accesses
g. Instruction cache speculative line count = 0
h. Instruction cache speculative line threshold = 0
*/
addis r0, 0, CCR0_DAPUIB@h
ori r0,r0, CCR0_DAPUIB@l
oris r0,r0, CCR0_GICBT@h
ori r0,r0, CCR0_GICBT@l
oris r0,r0, CCR0_GDCBT@h
ori r0,r0, CCR0_GDCBT@l
cmplw r10,r9
beq _440GP_PASS1_0
cmplw r11,r9
beq _440GP_PASS1_0
b _440GP_PASS1_SKIP0
_440GP_PASS1_0:
oris r0,r0, CCR0_BTAC_DISABLE@h
ori r0,r0, CCR0_BTAC_DISABLE@l
_440GP_PASS1_SKIP0:
mtspr CCR0,r0
/*
Configure instruction and data cache regions
These steps must be performed prior to enabling the caches
a. Clear the instruction and data cache normal victim index registers
b. Clear the instruction and data cache transient victim index regs
c. Set the instruction and data cache victim limit registers
*/
xor r0,r0,r0
mtspr INV0,r0
mtspr INV1,r0
mtspr INV2,r0
mtspr INV3,r0
mtspr DNV0,r0
mtspr DNV1,r0
mtspr DNV2,r0
mtspr DNV3,r0
mtspr ITV0,r0
mtspr ITV1,r0
mtspr ITV2,r0
mtspr ITV3,r0
mtspr DTV0,r0
mtspr DTV1,r0
mtspr DTV2,r0
mtspr DTV3,r0
addis r0, 0, IVLIM_TFLOOR_ENCODE(0)@h
ori r0,r0, IVLIM_TFLOOR_ENCODE(0)@l
oris r0,r0, IVLIM_TCEILING_ENCODE(63)@h
ori r0,r0, IVLIM_TCEILING_ENCODE(63)@l
oris r0,r0, IVLIM_NFLOOR_ENCODE(0)@h
ori r0,r0, IVLIM_NFLOOR_ENCODE(0)@l
mtspr IVLIM,r0
addis r0, 0, DVLIM_TFLOOR_ENCODE(0)@h
ori r0,r0, DVLIM_TFLOOR_ENCODE(0)@l
oris r0,r0, DVLIM_TCEILING_ENCODE(63)@h
ori r0,r0, DVLIM_TCEILING_ENCODE(63)@l
oris r0,r0, DVLIM_NFLOOR_ENCODE(0)@h
ori r0,r0, DVLIM_NFLOOR_ENCODE(0)@l
mtspr DVLIM,r0
/* initialize MMUCR */
addis r3, 0, MMUCR_DEFAULT@h
ori r3,r3, MMUCR_DEFAULT@l
mtspr MMUCR,r3
/* Set TLB entry for DDR SDRAM:
cached 0x00000000 -> 0x000000000 / 256MB
Attributes: G/X/W/R */
addi r1, 0, 0x0000 /* Tlb entry #0 */
addis r0, 0, 0x0000 /* EPN = 0x00000000 */
ori r0,r0, 0x0290 /* Valid, 256MB page size */
tlbwe r0,r1, 0x0000 /* Write low part of entry */
addis r0, 0, 0x0000
ori r0,r0, 0x0000 /* RPN = 0x000000000 */
tlbwe r0,r1, 0x0001 /* Write medium part of entry */
addi r0, 0, 0x013F /* G, UX, UW, UR, SX, SW, SR = 1 */
cmplw r10,r9
beq _440GP_PASSX_0
cmplw r11,r9
beq _440GP_PASSX_0
b _440GP_PASSX_SKIP0
_440GP_PASSX_0:
addi r0, 0, 0x093F /* W, G, UX, UW, UR, SX, SW, SR = 1 */
_440GP_PASSX_SKIP0:
tlbwe r0,r1, 0x0002 /* Write high part of entry */
/* Set TLB entry for peripherals:
0xE0000000 -> 0x140000000 / 256MB
Attributes: I/G/W/R */
addi r1, 0, 0x0001 /* Tlb entry #1 */
addis r0, 0, 0xE000 /* EPN = 0xE0000000 */
ori r0, r0, 0x0290 /* Valid, 256MB page size */
tlbwe r0, r1, 0x0000 /* Write low part of entry */
addis r0, 0, 0x4000
ori r0, r0, 0x0001 /* RPN = 0x140000000 */
tlbwe r0, r1, 0x0001 /* Write medium part of entry */
addi r0, 0, 0x051B /* I, G, UW, UR, SW, SR = 1 */
tlbwe r0, r1, 0x0002 /* Write high part of entry */
/* Setup for subsequent change in instruction fetch address
(Do a context switch to activate new TLB entries.) */
mfmsr r3
mtspr SRR1,r3
addis r0, 0, ..jumpover@h
ori r0,r0, ..jumpover@l
mtspr SRR0,r0
rfi
/* execution continues at label ..jumpover */
/*-----------------------------------------------------------------------
| Interrupt Vectors - default handlers (entry points)
*---------------------------------------------------------------------*/
/* Critical vector */
.align 2
..Critical_vector:
addis r3, 0,..crit_string@h
ori r3,r3,..crit_string@l
bl u_print
..crit_spin:
b ..crit_spin
..crit_string:
.4byte 0x0d0a0d0a
.byte "Unexpected Critical exception detected"
.byte 0x0d,0x0a,0x00,0x00,0x00,0x00
/* Machine check exception */
.align 2
..Machine_check_vector:
addis r3, 0,..mach_string@h
ori r3,r3,..mach_string@l
bl u_print
..mach_spin:
b ..mach_spin
..mach_string:
.4byte 0x0d0a0d0a
.byte "Machine check detected"
.byte 0x0d,0x0a,0x00,0x00,0x00,0x00
/* Data access protection exception */
.align 2
..Data_protection_vector:
addis r3, 0,..prot_string@h
ori r3,r3,..prot_string@l
bl u_print
..prot_spin:
b ..prot_spin
..prot_string:
.4byte 0x0d0a0d0a
.byte "Unexpected Data protection violation detected"
.byte 0x0d,0x0a,0x00
/* Instruction Storage exception */
.align 2
..Instruction_protection_vector:
addis r3, 0,..inst_prot_string@h
ori r3,r3,..inst_prot_string@l
bl u_print
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