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| author | John Wilbert M. Villamor <lameguy64@gmail.com> | 2020-09-19 20:43:05 +0800 |
|---|---|---|
| committer | John Wilbert M. Villamor <lameguy64@gmail.com> | 2020-09-19 20:43:05 +0800 |
| commit | 9f4891f95070c66ea9f1aba99d72724d4ab24e5a (patch) | |
| tree | 723e3ef2118a3d1a9e6dafa811ed1b8b1bc9196e /libpsn00b/psxetc/isr.s | |
| parent | 6762c39551ded059450d17d8bb0cb80642c8aaab (diff) | |
| download | psn00bsdk-9f4891f95070c66ea9f1aba99d72724d4ab24e5a.tar.gz | |
Revised makefiles, added strtok(), command line arguments, SetHeapSize(), moved ISR and callback system to psxetc, moved debug font to psxgpu, fixed CD-ROM library crashing on PSIO, fixed interrupt callback setup to fix crashing on ResetGraph()
Diffstat (limited to 'libpsn00b/psxetc/isr.s')
| -rw-r--r-- | libpsn00b/psxetc/isr.s | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/libpsn00b/psxetc/isr.s b/libpsn00b/psxetc/isr.s new file mode 100644 index 0000000..00428a4 --- /dev/null +++ b/libpsn00b/psxetc/isr.s @@ -0,0 +1,107 @@ +.set noreorder + +.include "hwregs_a.h" + +.set ISR_STACK_SIZE, 4096 + + +.section .text + +# Global ISR handler of PSn00bSDK + +.set at + +.type _global_isr, @function +_global_isr: + +.Lisr_loop: + + #la $gp, _gp # Keep restoring GP since it gets + # changed elsewhere sometimes + + lui $a0, IOBASE # Get IRQ status + lw $v0, IMASK($a0) + nop + + srl $v0, $s1 # Check IRQ mask bit if set + andi $v0, 0x1 + + beqz $v0, .Lno_irq # Don't execute callback if IRQ not enabled + nop + + lw $v0, ISTAT($a0) + nop + srl $v0, $s1 # Check IRQ status bit if set + andi $v0, 0x1 + beqz $v0, .Lno_irq # Don't execute callback if no IRQ + nop + + lw $v1, 0($s0) # Load IRQ callback function + nop + + lw $v0, ISTAT($a0) # Acknowledge the IRQ (by writing a 0 bit) + li $a1, 1 + sll $a1, $s1 + addiu $a2, $0 , -1 + xor $a1, $a2 + sw $a1, ISTAT($a0) + + beqz $v1, .Lno_irq # Don't execute if callback is not set + nop + + jalr $v1 # Call interrupt handler + nop + +.Lno_irq: + + addiu $s0, 4 + + blt $s1, 11, .Lisr_loop + addiu $s1, 1 + + j ReturnFromException + nop + + +.section .data + +# Global ISR callback table + +.global _irq_func_table +.type _irq_func_table, @object +_irq_func_table: + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + +# Global ISR hook structure +.global _custom_exit +.type _custom_exit, @object +_custom_exit: + .word _global_isr # pc + .word _isr_stack+ISR_STACK_SIZE # sp + .word 0 # fp + .word _irq_func_table # s0 + .word 0 # s1 + .word 0 # s2 + .word 0 # s3 + .word 0 # s4 + .word 0 # s5 + .word 0 # s6 + .word 0 # s7 + .word _gp # gp + +# Global ISR stack +# .fill 1024 +#_custom_exit_stack: +# .fill 4 +.comm _isr_stack, ISR_STACK_SIZE+4 |