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- /*
- * File : start_gcc.S
- * Change Logs:
- * Date Author Notes
- * 2010-05-17 swkyer first version
- * 2010-09-04 bernard porting to Jz47xx
- */
- #include "../common/mips.inc"
- #include "../common/stackframe.h"
- #include "soc3210.h"
- .section ".start", "ax"
- .set noreorder
- /* the program entry */
- .globl _start
- _start:
- .set noreorder
- la ra, _start
- /* disable interrupt */
- mfc0 t0, CP0_STATUS
- and t0, 0xfffffffe # By default it will be disabled.
- mtc0 t0, CP0_STATUS # Set CPU to disable interrupt.
- nop
- /* disable cache */
- mfc0 t0, CP0_CONFIG
- and t0, 0xfffffff8
- or t0, 0x2 # disable,!default value is not it!
- mtc0 t0, CP0_CONFIG # Set CPU to disable cache.
- nop
- /* setup stack pointer */
- li sp, SYSTEM_STACK
- la gp, _gp
- /* copy IRAM section */
- la t0, _iramcopy
- la t1, _iramstart
- la t2, _iramend
- _iram_loop:
- lw t3, 0(t0)
- sw t3, 0(t1)
- addiu t1, 4
- bne t1, t2, _iram_loop
- addiu t0, 4
- /* clear bss */
- la t0, __bss_start
- la t1, __bss_end
- _clr_bss_loop:
- sw zero, 0(t0)
- bne t0, t1, _clr_bss_loop
- addiu t0, t0, 4
- /* jump to RT-Thread RTOS */
- jal rtthread_startup
- nop
- /* restart, never die */
- j _start
- nop
- .set reorder
- .globl cp0_get_cause
- cp0_get_cause:
- mfc0 v0, CP0_CAUSE
- jr ra
- nop
- .globl cp0_get_status
- cp0_get_status:
- mfc0 v0, CP0_STATUS
- jr ra
- nop
- .globl cp0_get_hi
- cp0_get_hi:
- mfhi v0
- jr ra
- nop
- .globl cp0_get_lo
- cp0_get_lo:
- mflo v0
- jr ra
- nop
- .extern tlb_refill_handler
- .extern cache_error_handler
- /* Exception Handler */
- /* 0x0 - TLB refill handler */
- .section .vectors.1, "ax", %progbits
- j tlb_refill_handler
- nop
-
- /* 0x100 - Cache error handler */
- .section .vectors.2, "ax", %progbits
- j cache_error_handler
- nop
-
- /* 0x180 - Exception/Interrupt handler */
- .section .vectors.3, "ax", %progbits
- j _general_exception_handler
- nop
-
- /* 0x200 - Special Exception Interrupt handler (when IV is set in CP0_CAUSE) */
- .section .vectors.4, "ax", %progbits
- j _irq_handler
- nop
-
- .section .vectors, "ax", %progbits
- .extern mips_irq_handle
- /* general exception handler */
- _general_exception_handler:
- .set noreorder
- la k0, mips_irq_handle
- jr k0
- nop
- .set reorder
- /* interrupt handler */
- _irq_handler:
- .set noreorder
- la k0, mips_irq_handle
- jr k0
- nop
- .set reorder
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