diff options
Diffstat (limited to 'utils/hwstub/stub/jz4760b/crt0.S')
| -rw-r--r-- | utils/hwstub/stub/jz4760b/crt0.S | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/utils/hwstub/stub/jz4760b/crt0.S b/utils/hwstub/stub/jz4760b/crt0.S index 73dbe20428..94d95b3e73 100644 --- a/utils/hwstub/stub/jz4760b/crt0.S +++ b/utils/hwstub/stub/jz4760b/crt0.S @@ -51,7 +51,7 @@ reloc_loop: /* Tricky part: as explained earlier, tcsm0 is uncached so no need to commit * the dcache but we want to invalidate the icache ONLY AT THIS LOCATION. - * Indeed, if the invalidate the entire icache in the cache-as-ram case, we + * Indeed, if we invalidate the entire icache in the cache-as-ram case, we * will miserably crash */ cache ICHitInv, 0(t0) /* invalidate virtual address in icache */ @@ -92,7 +92,71 @@ clear_bss_loop: stack_setup: la sp, oc_stackend + /* the tcsm0 is usually accessed by its weird 0xf4000000 address but this + * address is not in the range available for EBASE (because EBASE[31:30] + * is hardwired to 0b10). Fortunately, the TCSM0 can be accessed by its + * physical address (0x132b0000) if we ungate the AHB1 */ + la t0, 0xb0000028 /* CPM_CLKGATE1 */ + lw t1, 0(t0) + li t2, 0xffffff7e /* AHB1 */ + and t1, t2 /* clear AHB1 */ + sw t1, 0(t0) + /* keep interrupts disabled, use normal exception vectors (to use EBASE) */ + li t0, 0 + mtc0 t0, C0_STATUS + /* set EBASE */ + la t0, irqbase + mtc0 t0, C0_EBASE /* jump to C code */ la t0, main jr t0 move a0, k0 + +die_blink: + /* die blinking */ + la a0, 0xb0010400 + li a1, 2 + sw a1, 0x48(a0) /* clear function (gpio or interrupt) */ + sw a1, 0x58(a0) /* clear select (gpio) */ + sw a1, 0x64(a0) /* set direction (out) */ + sw a1, 0x34(a0) /* set pull (disable) */ + /* turn backlight on and off */ + la a0, 0xb0010414 + li a1, 2 +.blink_loop: + sw a1, (a0) + la v0, 10000000 +.wait: + bnez v0, .wait + subu v0, 1 + sw a1, 4(a0) + la v0, 10000000 +.wait2: + bnez v0, .wait2 + subu v0, 1 + j .blink_loop + nop + +/* restore_data_abort_jmp restores the context and returns from exception */ + .extern restore_data_abort_jmp + + .global tlb_refill_handler + .section .exception.tlb_refill,"ax",%progbits +tlb_refill_handler: + la k0, restore_data_abort_jmp + jr k0 + nop + + .global cache_error_handler + .section .exception.cache_error,"ax",%progbits +cache_error_handler: + la k0, restore_data_abort_jmp + jr k0 + nop + + .global general_exception_handler + .section .exception.general_exception,"ax",%progbits +general_exception_handler: + la k0, restore_data_abort_jmp + jr k0 + nop |