ARM11 Interrupts: Difference between revisions

← Older edit

@@ Line 14: / Line 14: @@
 | 0
 |
-| MPCore software-interrupt. Not configured.
+| MPCore software-interrupt. Used by Kernel11 to sync cores in crt0.
 |-
-| 0x1
+| 0x1-0x3
 |
-| MPCore software-interrupt. Used by BOOT11 to kickstart Core1.
+| MPCore software-interrupt. Used by Boot11 and Kernel11 to kickstart Core1/2/3, and by Kernel11 to sync cores in crt0.
-|-
-| 0x2-0x3
-|
-| MPCore software-interrupt. Seem to be unused.
 |-
 | 0x4
 | Kernel
-| MPCore software-interrupt. Used to manage the performance counter.
+| MPCore software-interrupt. Used to manage the performance counter. Also used by Kernel11 during crt0 to sync up.
 |-
 | 0x5
@@ Line 92: / Line 88: @@
 | 0x2A
 | gsp, TwlBg
-| PDC0 (VBlank0)
+| PDC0 (Top screen VBlank0, HBlank0)
 |-
 | 0x2B
 | gsp, TwlBg
-| PDC1 (VBlank1)
+| PDC1 (Bottom screen VBlank1, HBlank1)
 |-
 | 0x2C
@@ Line 216: / Line 212: @@
 | 0x58
 | Kernel
-| PDN Wake Event
+| PDN (wake event or SoC mode changed)
 |-
 | 0x59
@@ Line 225: / Line 221: @@
 | mic
 | General microphone interrupt (?)
+|-
+| 0x5B
+| -
+| [[HID_Registers#HID_PAD_CNT|HID_PAD_CNT]]
 |-
 | 0x5C
@@ Line 236: / Line 236: @@
 | 0x60
 | gpio, TwlBg
-| Shell opened
+| Shell opened (GPIO1_2 falling edge)
 |-
 | 0x62
 | gpio, TwlBg
-| Shell closed
+| Shell closed (GPIO1_2 rising edge)
 |-
 | 0x63
 | gpio, TwlBg
-| Touchscreen Pen Down
+| Touch Screen pressed (GPIO1_1 falling edge)
 |-
 | 0x64
 | gpio, TwlBg
-| Headphone jack plugged in/out
+| Headphones inserted (GPIO2_0)
 |-
 | 0x66
 | gpio, TwlBg
-| GPIO_DATA1.bit1 (sfio = ?)
+| TWL depop circuit (GPIO2_1)
 |-
 | 0x68
 | gpio, TwlBg
-| C-stick Interrupt
+| C-stick interrupt (GPIO3_0)
 |-
 | 0x69
 | gpio, TwlBg
-| IrDA Interrupt
+| IrDA interrupt (active-low) (GPIO3_1)
 |-
 | 0x6A
 | gpio, TwlBg
-| Gyro Interrupt
+| Gyro interrupt (GPIO3_2)
 |-
 | 0x6B
 | gpio, TwlBg
-| GPIO_DATA3.bit3 (sfio = ?)
+| C-stick "stop" (output) (GPIO3_3)
 |-
 | 0x6C
 | gpio, TwlBg
-| GPIO_DATA3.bit4 (sfio = ?)
+| IrDA TX-RC (output) (GPIO3_4)
 |-
 | 0x6D
 | gpio, TwlBg
-| GPIO_DATA3.bit5 (sfio = ?)
+| IrDA RXD (GPIO3_5)
 |-
 | 0x6E
 | gpio, TwlBg
-| GPIO_DATA3.bit6 (sfio = ?)
+| NFC output1 (?) (GPIO3_6)
 |-
 | 0x6F
 | gpio, TwlBg
-| GPIO_DATA3.bit7 (sfio = ?)
+| NFC output2 (?) (GPIO3_7)
 |-
 | 0x70
 | gpio, TwlBg
-| GPIO_DATA3.bit8 (sfio = ?)
+| Headphones button/half-inserted (active-low) (GPIO3_8)
 |-
 | 0x71
 | gpio, TwlBg
-| MCU (HOME/POWER pressed/released or WiFi switch pressed, etc.)
+| MCU interrupt (GPIO3_9)
 |-
 | 0x72
 | gpio, TwlBg
-| NFC
+| NFC interrupt (?) (GPIO3_10)
 |-
 | 0x73
 | TwlBg
-| GPIO_DATA3.bit11 (sfio = ?)
+| QTM output (?) (GPIO3_11)
 |-
 | 0x74
@@ Line 326: / Line 326: @@
-There are 2 tables in the ARM11 kernel: the first has 32 * 2(or 32 * 4) 8-byte entries. This table is for the private interrupts that belong to each core.  The data for each interrupt can be found by doing table_base + (core_num * 0x100) + (intr_num * 8).  The second table is for public hardware interrupts and the data for each interrupt can be retrieved by doing table_base + (intr_num * 8).
+There are 2 tables in the Arm11 kernel: the first has 32 * 2(or 32 * 4) 8-byte entries. This table is for the private interrupts that belong to each core.  The data for each interrupt can be found by doing table_base + (core_num * 0x100) + (intr_num * 8).  The second table is for public hardware interrupts and the data for each interrupt can be retrieved by doing table_base + (intr_num * 8).
-The Arm11 kernel configures interrupts the following way:
+The Arm11 kernel configures interrupts the following way (it seems the GPIO IRQ layout doesn't match released 3DS models):
   <nowiki>Interrupts 0x00 to 0x1F: edge-triggered, N-N