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read SoC Temperature

.github/workflows/rust.yml

@@ -0,0 +1,36 @@
+name: Rust
+
+on:
+  push:
+  pull_request:
+    branches: ["master"]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install rustfmt for nightly
+        run: rustup component add --toolchain nightly-x86_64-unknown-linux-gnu rustfmt clippy
+      - name: Add AArch64 Target
+        run: rustup target add aarch64-unknown-none
+      - name: Run format check
+        run: cargo fmt --check
+      - name: Run lint
+        run: cargo clippy
+
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install rustfmt for nightly
+        run: rustup component add --toolchain nightly-x86_64-unknown-linux-gnu rustfmt clippy
+      - name: Add AArch64 Target
+        run: rustup target add aarch64-unknown-none
+      - name: Build
+        run: cargo build --verbose

.gitignore

@@ -2,3 +2,4 @@
 kernel8.img
 .env
 sd.img
+settings.json

.vscode/launch.json

@@ -1,5 +1,12 @@
 {
   "version": "0.2.0",
+  "compounds": [
+    {
+      "name": "Run QEMU + Attach LLDB",
+      "configurations": ["Attach LLDB"],
+      "preLaunchTask": "Run QEMU"
+    }
+  ],
   "configurations": [
     {
       "name": "Attach to QEMU (AArch64)",
@@ -12,7 +19,7 @@
       "stopAtEntry": true,
       "externalConsole": false,
       "MIMode": "gdb",
-"setupCommands": [
+      "setupCommands": [
         {
           "description": "Enable pretty-printing for gdb",
           "text": "-enable-pretty-printing",
@@ -20,11 +27,21 @@
         },
         {
           "description": "Show assembly on stop",
-    "text": "layout asm",
+          "text": "set disassemble-next-line on",
           "ignoreFailures": true
         }
-],
+      ],
       "preLaunchTask": "Run QEMU"
+    },
+
+    {
+      "name": "Attach LLDB",
+      "type": "lldb",
+      "request": "attach",
+      "debugServer": 1234,
+      "program": "${workspaceFolder}/target/aarch64-unknown-none/debug/nova",
+      "stopOnEntry": true,
+      "processCreateCommands": ["gdb-remote localhost:1234"]
     }
   ]
 }

.vscode/tasks.json

@@ -14,7 +14,7 @@
     {
       "label": "Run QEMU",
       "type": "shell",
-      "command": "qemu-system-aarch64 -M raspi3b -cpu cortex-a53 -serial stdio -sd sd.img -display none -kernel ${workspaceFolder}/target/aarch64-unknown-none/debug/kernel8.img -S -s",
+      "command": "qemu-system-aarch64 -M raspi3b -cpu cortex-a53 -serial stdio -sd sd.img -display none -kernel ${workspaceFolder}/target/aarch64-unknown-none/debug/kernel8.img -S -s -m 1024",
       "isBackground": true,
       "dependsOn": ["Build"]
     }

Cargo.toml

@@ -6,6 +6,8 @@ edition = "2021"
 
 [profile.dev]
 panic = "abort"
+debug = true
+opt-level = 0
 
 [profile.release]
 panic = "abort"

link.ld

@@ -27,10 +27,9 @@ SECTIONS {
         KEEP(*(.vector_table))
     }
 
-    .stack 0x8008000 : ALIGN(16)
+    .stack 0x8018000 : ALIGN(16)
     {
     __stack_start = .;
-    .+=0x10000;
     __stack_end = .;
     }
 

src/configuration.rs

@@ -0,0 +1,15 @@
+static SCTLR_EL1_MMU_DISABLED: u64 = 0 << 0; //M
+static SCTLR_EL1_DATA_CACHE_DISABLED: u64 = 0 << 2; //C
+static SCTLR_EL1_INSTRUCTION_CACHE_DISABLED: u64 = 0 << 12; //I
+static SCTLR_EL1_LITTLE_ENDIAN_EL0: u64 = 0 << 24; //E0E
+static SCTLR_EL1_LITTLE_ENDIAN_EL1: u64 = 0 << 25; //EE
+
+static SCTLR_EL1_RES: u64 = (0 << 6) | (1 << 11) | (0 << 17) | (1 << 20) | (1 << 22); //Res0 & Res1
+
+#[no_mangle]
+pub static SCTLR_EL1_CONF: u64 = SCTLR_EL1_MMU_DISABLED
+    | SCTLR_EL1_DATA_CACHE_DISABLED
+    | SCTLR_EL1_INSTRUCTION_CACHE_DISABLED
+    | SCTLR_EL1_LITTLE_ENDIAN_EL0
+    | SCTLR_EL1_LITTLE_ENDIAN_EL1
+    | SCTLR_EL1_RES;

src/irq_interrupt.rs

@@ -3,7 +3,14 @@ use core::{
     sync::atomic::{compiler_fence, Ordering},
 };
 
-use crate::{mmio_read, mmio_write, peripherals::uart::print};
+use crate::{
+    mmio_read, mmio_write,
+    peripherals::{
+        gpio::{blink_gpio, SpecificGpio},
+        uart::print,
+    },
+    timer::{sleep_ms, sleep_s},
+};
 
 const INTERRUPT_BASE: u32 = 0x3F00_B000;
 const IRQ_PENDING_BASE: u32 = INTERRUPT_BASE + 0x204;
@@ -35,7 +42,42 @@ unsafe extern "C" fn irq_handler() {
     handle_gpio_interrupt();
 }
 
+#[no_mangle]
+unsafe extern "C" fn synchronous_interrupt() {
+    loop {
+        print("Sync Exception \r\n");
+        blink_gpio(SpecificGpio::OnboardLed as u8, 100);
+        esr_uart_dump();
+        sleep_s(200);
+    }
+}
+
+fn esr_uart_dump() {
+    let esr: u32;
+    unsafe {
+        asm!(
+            "mrs {esr}, ESR_EL1",
+            esr = out(reg) esr
+        );
+    }
+    for i in (0..32).rev() {
+        if ((esr >> i) & 1) == 0 {
+            print("0");
+        } else {
+            print("1");
+        }
+        if i % 4 == 0 && i > 0 {
+            print("_");
+        }
+
+        if i == 26 || i == 25 || i == 0 {
+            print("\n\r");
+        }
+    }
+}
+
 fn handle_gpio_interrupt() {
+    print("Interrupt\r\n");
     for i in 0..=53u32 {
         let val = read_gpio_event_detect_status(i);
 

src/lib.rs

@@ -4,6 +4,7 @@ use core::ptr::{read_volatile, write_volatile};
 
 pub mod peripherals;
 
+pub mod configuration;
 pub mod irq_interrupt;
 pub mod mailbox;
 pub mod timer;

src/mailbox.rs

@@ -0,0 +1,58 @@
+use crate::{mmio_read, mmio_write, peripherals::uart::print};
+
+const MBOX_BASE: u32 = 0x3F00_0000 + 0xB880;
+
+// MB0
+const MBOX_READ: u32 = MBOX_BASE + 0x00;
+const MBOX_STATUS: u32 = MBOX_BASE + 0x18;
+
+// MB1
+const MBOX_WRITE: u32 = MBOX_BASE + 0x20;
+
+// Status
+const MAIL_FULL: u32 = 0x80000000;
+const MAIL_EMPTY: u32 = 0x40000000;
+
+pub fn read_mailbox(channel: u32) -> u32 {
+    // Wait until mailbox is not empty
+    loop {
+        while mmio_read(MBOX_STATUS) & MAIL_EMPTY != 0 {}
+        let mut data = mmio_read(MBOX_READ);
+        let read_channel = data & 0xF;
+
+        data >>= 4;
+
+        if channel == read_channel {
+            return data;
+        }
+    }
+}
+
+pub fn write_mailbox(channel: u32, data: u32) {
+    while mmio_read(MBOX_STATUS) & MAIL_FULL != 0 {}
+    mmio_write(MBOX_WRITE, (data & !0xF) | (channel & 0xF));
+}
+
+pub fn read_soc_temp() -> u32 {
+    let mut mailbox = [0; 36];
+    mailbox[0] = 8 * 4; // Total size in bytes
+    mailbox[1] = 0; // Request
+    mailbox[2] = 0x00030006; // Tag
+    mailbox[3] = 8; // Maximum buffer len
+    mailbox[4] = 4; // Request length
+    mailbox[5] = 0; // Value Buffer
+    mailbox[6] = 0; // Value Buffer
+    mailbox[7] = 0; // End
+
+    let addr = core::ptr::addr_of!(mailbox[0]) as u32;
+
+    write_mailbox(8, addr);
+
+    let _ = read_mailbox(8);
+
+    if mailbox[1] == 0 {
+        print("Failed\r\n");
+    }
+    let raw_temp = mailbox[6] / 1000;
+    raw_temp
+}

src/main.rs

@@ -5,24 +5,28 @@
 use core::{
     arch::{asm, global_asm},
     panic::PanicInfo,
+    ptr::write_volatile,
 };
 
 use nova::{
     irq_interrupt::enable_irq_source,
+    mailbox::read_soc_temp,
     peripherals::{
         gpio::{
-            gpio_get_state, gpio_high, gpio_low, gpio_pull_up, set_falling_edge_detect,
+            blink_gpio, gpio_pull_up, set_falling_edge_detect, set_gpio_function, GPIOFunction,
-            set_gpio_function, GPIOFunction,
+            SpecificGpio,
         },
-        uart::{print, uart_init},
+        uart::{print, print_u32, uart_init},
     },
-    timer::{delay_nops, sleep_ms, sleep_us},
+    timer::{delay_nops, sleep_us},
 };
 
 global_asm!(include_str!("vector.S"));
 
 extern "C" {
     fn el2_to_el1();
+    static mut __bss_start: u32;
+    static mut __bss_end: u32;
 }
 
 #[panic_handler]
@@ -46,6 +50,9 @@ pub unsafe extern "C" fn _start() {
 
 #[no_mangle]
 pub extern "C" fn main() -> ! {
+    unsafe {
+        zero_bss();
+    }
     enable_uart();
 
     // Set ACT Led to Outout
@@ -58,12 +65,21 @@ pub extern "C" fn main() -> ! {
     print("Hello World!\r\n");
 
     unsafe {
+        asm!("mrs x0, SCTLR_EL1");
         el2_to_el1();
     }
 
     loop {}
 }
 
+unsafe fn zero_bss() {
+    let mut bss: *mut u32 = &raw mut __bss_start as *mut u32;
+    while bss < &raw mut __bss_end as *mut u32 {
+        write_volatile(bss, 0);
+        bss = bss.add(1);
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn kernel_main() -> ! {
     print_current_el_str();
@@ -77,26 +93,13 @@ pub extern "C" fn kernel_main() -> ! {
     set_falling_edge_detect(26, true);
 
     loop {
-        let _ = gpio_high(29);
+        let temp = read_soc_temp();
+        print_u32(temp);
 
-        sleep_ms(500); // 0.5s
+        blink_gpio(SpecificGpio::OnboardLed as u8, 500);
-        let _ = gpio_low(29);
-        sleep_ms(500); // 0.5s
-        print_gpio_state();
     }
 }
 
-fn print_gpio_state() {
-    let state = gpio_get_state(26);
-
-    let ascii_byte = b'0' + state;
-    let data = [ascii_byte];
-
-    let s = str::from_utf8(&data).unwrap();
-    print(s);
-    print("\r\n");
-}
-
 pub fn get_current_el() -> u64 {
     let el: u64;
     unsafe {

src/peripherals/gpio.rs

@@ -1,7 +1,7 @@
 use core::result::Result;
 use core::result::Result::Ok;
 
-use crate::timer::delay_nops;
+use crate::timer::{delay_nops, sleep_ms};
 use crate::{mmio_read, mmio_write};
 
 const GPFSEL_BASE: u32 = 0x3F20_0000;
@@ -13,6 +13,11 @@ const GPPUDCLK_BASE: u32 = 0x3F20_0098;
 const GPREN_BASE: u32 = 0x3F20_004C;
 const GPFEN_BASE: u32 = 0x3F20_0058;
 
+#[repr(u8)]
+pub enum SpecificGpio {
+    OnboardLed = 29,
+}
+
 #[repr(u32)]
 pub enum GPIOFunction {
     Input = 0b000,
@@ -90,7 +95,6 @@ pub fn gpio_pull_down(gpio: u8) {
 }
 
 fn gpio_pull_up_down(gpio: u8, val: u32) {
-    unsafe {
     // Determine GPPUDCLK Register
     let register_addr = GPPUDCLK_BASE + 4 * (gpio as u32 / 32);
     let register_offset = gpio % 32;
@@ -113,7 +117,6 @@ fn gpio_pull_up_down(gpio: u8, val: u32) {
 
     // 6. reset clock
     mmio_write(register_addr, 0);
-    }
 }
 
 /// Get the current status if falling edge detection is set
@@ -166,3 +169,11 @@ pub fn set_rising_edge_detect(gpio: u8, enable: bool) {
 
     mmio_write(register_addr, new_val);
 }
+
+pub fn blink_gpio(gpio: u8, duration_ms: u32) {
+    let _ = gpio_high(gpio);
+
+    sleep_ms(duration_ms);
+    let _ = gpio_low(gpio);
+    sleep_ms(duration_ms);
+}

src/peripherals/uart.rs

@@ -1,3 +1,5 @@
+use core::arch::asm;
+
 use crate::{mmio_read, mmio_write};
 
 const BAUD: u32 = 115200;
@@ -21,11 +23,41 @@ const UART0_LCRH_FEN: u32 = 1 << 4;
 /// Print `s` over UART
 pub fn print(s: &str) {
     for byte in s.bytes() {
-        while mmio_read(UART0_FR) & UART0_FR_TXFF != 0 {}
+        while (mmio_read(UART0_FR) & UART0_FR_TXFF) != 0 {
+            unsafe { asm!("nop") }
+        }
         mmio_write(UART0_DR, byte as u32);
     }
     // wait till uart is not busy anymore
-    while (mmio_read(UART0_FR) >> 3) & 0b1 != 0 {}
+    while ((mmio_read(UART0_FR) >> 3) & 0b1) != 0 {}
+}
+
+pub fn print_u32(mut val: u32) {
+    let mut last_valid = 0;
+    let mut values = [0u32; 10];
+    for (i, c) in (&mut values).iter_mut().enumerate() {
+        if val == 0 {
+            break;
+        }
+
+        *c = val % 10;
+        val /= 10;
+        if *c != 0 {
+            last_valid = i;
+        }
+    }
+
+    for (i, c) in values.iter().enumerate().rev() {
+        if i > last_valid {
+            continue;
+        }
+        let ascii_byte = b'0' + *c as u8;
+        let data = [ascii_byte];
+
+        let s = str::from_utf8(&data).unwrap();
+        print(s);
+    }
+    print("\r\n");
 }
 
 /// Initialize UART peripheral

src/vector.S

@@ -14,14 +14,13 @@ vector_table:
     ventry .
     ventry .
 
-    ventry .
+    ventry synchronous_interrupt      // Synchronous Exception  0x200
     ventry irq_handler                // IRQ(Interrupt Request) 0x280
     ventry .
     ventry .
 
 
 .align 4
-.extern main
 .global el2_to_el1
 el2_to_el1:
 
@@ -44,6 +43,16 @@ el2_to_el1:
     adr x0, vector_table
     msr VBAR_EL1, x0
 
+    // Disable MMU
+    ldr x0, =SCTLR_EL1_CONF
+    msr sctlr_el1, x0
+
+    // SIMD should not be trapped
+    mrs x0, CPACR_EL1
+    mov x1, #(0b11<<20)
+    orr x0,x0, x1
+    msr CPACR_EL1,x0
+
     isb
 
     // Return to EL1

tools/start_simulator_debug.sh

@@ -10,4 +10,5 @@ qemu-system-aarch64 \
   -serial stdio \
   -sd ../sd.img \
   -display none \
-  -kernel ../target/aarch64-unknown-none/debug/kernel8.img
+  -kernel ../target/aarch64-unknown-none/debug/kernel8.img \
+  -s -S