diff options
Diffstat (limited to 'openpicc/os/boot/boot.s')
| -rw-r--r-- | openpicc/os/boot/boot.s | 93 |
1 files changed, 14 insertions, 79 deletions
diff --git a/openpicc/os/boot/boot.s b/openpicc/os/boot/boot.s index a7e9c32..cedd3ee 100644 --- a/openpicc/os/boot/boot.s +++ b/openpicc/os/boot/boot.s @@ -182,90 +182,14 @@ endless_loop: ldr pc, _dabt /* data abort - _dabt */ nop /* reserved */ ldr pc, [pc,#-0xF20] /* IRQ - read the AIC */ - ldr pc, [pc,#-0xF20] /* FIQ - read the AIC */ +/* ldr pc, [pc,#-0xF20] /* FIQ - fall through to fiq_handler */ -_undf: .word __undf /* undefined */ -_swi: .word swi_handler /* SWI */ -_pabt: .word __pabt /* program abort */ -_dabt: .word __dabt /* data abort */ -_fiq: .word __fiq /* FIQ */ - -__undf: b . /* undefined */ -__pabt: b . /* program abort */ -__dabt: b . /* data abort */ -__fiq: b . /* FIQ */ -/* Following is from openpcd/firmware/src/start/Cstartup_app.S */ +/* Following is modified from openpcd/firmware/src/start/Cstartup_app.S */ #define LED_TRIGGER -/*#define CALL_PIO_IRQ_DEMUX*/ - - .text - .arm - .section .fastrun, "ax" - + .global fiq_handler .func fiq_handler -fiq_handler: - /* code that uses pre-initialized FIQ reg */ - /* r8 AT91C_BASE_AIC (dfu init) - r9 AT91C_TC_SWTRG - r10 AT91C_BASE_PIOA - r11 tmp - r12 AT91C_BASE_TC0 - r13 stack - r14 lr - */ - - ldr r8, [r10, #PIOA_ISR] - tst r8, #PIO_DATA /* check for PIO_DATA change */ - ldrne r11, [r10, #PIOA_PDSR] - tstne r11, #PIO_DATA /* check for PIO_DATA == 1 */ - strne r9, [r12, #TC_CCR] /* software trigger */ -#ifdef LED_TRIGGER - movne r11, #PIO_LED1 - strne r11, [r10, #PIOA_CODR] /* enable LED */ -#endif - -#if 1 - movne r11, #PIO_DATA - strne r11, [r10, #PIOA_IDR] /* disable further PIO_DATA FIQ */ -#endif - - /*- Mark the End of Interrupt on the AIC */ - ldr r11, =AT91C_BASE_AIC - str r11, [r11, #AIC_EOICR] - -#ifdef LED_TRIGGER - mov r11, #PIO_LED1 - str r11, [r10, #PIOA_SODR] /* disable LED */ -#endif - -#ifdef CALL_PIO_IRQ_DEMUX - /* push r0, r1-r3, r12, r14 onto FIQ stack */ - /*stmfd sp!, { r0-r3, r12, lr} - mov r0, r8*/ - - /* enable interrupts while handling demux */ - /* enable interrupts while handling demux */ - /* msr CPSR_c, #F_BIT | ARM_MODE_SVC */ - - /* Call C function, give PIOA_ISR as argument */ - /*ldr r11, =__pio_irq_demux - mov r14, pc - bx r11*/ - - /* msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ */ - /*ldmia sp!, { r0-r3, r12, lr }*/ -#endif - - /*- Restore the Program Counter using the LR_fiq directly in the PC */ - subs pc, lr, #4 - - .size fiq_handler, . - fiq_handler - .endfunc - - .global my_fiq_handler - .func my_fiq_handler my_fiq_handler: /* code that uses pre-initialized FIQ reg */ /* r8 tmp @@ -315,5 +239,16 @@ my_fiq_handler: .size my_fiq_handler, . - my_fiq_handler .endfunc +_undf: .word __undf /* undefined */ +_swi: .word swi_handler /* SWI */ +_pabt: .word __pabt /* program abort */ +_dabt: .word __dabt /* data abort */ +_fiq: .word __fiq /* FIQ */ + +__undf: b . /* undefined */ +__pabt: b . /* program abort */ +__dabt: b . /* data abort */ +__fiq: b . /* FIQ */ + .end |