From c06fb44b7f63bbb94523f0f4d2908d34d22b94c2 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Fri, 3 Dec 2021 09:55:06 -0700
Subject: Started moving source files to subdirectories

---
 src/cpu/irq.S | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/cpu/irq.S

(limited to 'src/cpu')

diff --git a/src/cpu/irq.S b/src/cpu/irq.S
new file mode 100644
index 0000000..53a749e
--- /dev/null
+++ b/src/cpu/irq.S
@@ -0,0 +1,62 @@
+.globl a_irq_handler
+a_irq_handler:
+	push {lr}
+	bl disable_irq
+	// r2 = CORE0_INTERRUPT_SOURCE
+	// if r2 & 0b100000000
+	mov r2, #0x40000000
+	ldr r3, [r2, #0x60]
+	tst r3, #256
+	beq a_irq_handler.timer
+	// r2 = IRQ_PEND2
+	// r2 & 1 << 25
+	mov r2, #0xB208
+	movt r2, #0x3F00
+	ldr r3, [r2]
+	tst r3, #0x2000000
+	beq a_irq_handler.exit
+	mov r2, #0x1040
+	movt r2, #0x3F20
+	ldr r3, [r2]
+	tst r3, #16
+	beq a_irq_handler.exit
+	mov r2, #0x1000
+	movt r2, #0x3F20
+	ldrb r0, [r2]
+	push {r0}
+	bl enable_irq
+	pop {r0}
+	bl uart_char
+	ldr r0, =imsg
+	bl uart_string
+	pop {pc}
+a_irq_handler.timer:
+	// r2 = CORE0_INTERRUPT_SOURCE
+	// if r2 & 0b1000
+	mov r2, #0x40000000
+	ldr r3, [r2, #0x60]
+	tst r3, #8
+	beq a_irq_handler.exit
+	bl c_timer
+	//ldr r0, =imsg
+	//bl uart_string
+a_irq_handler.exit:
+	bl enable_irq
+	pop {pc}
+
+.globl a_fiq_handler
+a_fiq_handler:
+	push {lr}
+	bl disable_fiq
+	bl c_timer
+	ldr r0, =fmsg
+	bl uart_string
+a_fiq_handler.exit:
+	bl enable_fiq
+	pop {pc}
+
+.section ".data"
+imsg:
+	.asciz " asm_irq_handler\n"
+fmsg:
+	.asciz " asm_fiq_handler\n"
-- 
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